TW201238397A - Dimming controller, system and method thereof - Google Patents

Abstract

A dimming controller, said controller comprising: a control terminal operable for providing a driving signal to control a control switch coupled to said LED light source, thereby controlling said dimming of said LED light source; and dimming control circuitry coupled to said control terminal and operable for generating said driving signal according to a plurality of operations of a power switch that transfers an alternating-current signal, said dimming control circuitry operable for adjusting said driving signal by counting a plurality of waves of said AC signal to control said dimming of said LED light source.

Description

201238397 VI. Description of the Invention: [Technical Field] The present invention relates to the field of electronic technology, and more particularly to a controller, system and method for controlling dimming of a light source. [Prior Art] In recent years, new light sources such as light-emitting diodes (LEDs) have made advances in materials and manufacturing. LEDs are characterized by high efficiency, long life and bright colors, and can be used in automobiles, computers, communications, military and daily necessities. For example, LED lights can replace traditional incandescent lamps as illumination sources. FIG. 1 is a schematic diagram of a conventional LED driving circuit 1〇〇. The led drive circuit 100 utilizes the LED string 106 as a light source. The LED string 1〇6 contains a plurality of LEDs connected in series. Power converter 丨〇2 is used to convert DC input voltage Vin to a desired DC output voltage VOUT for powering LED string 106. The switch 1〇4 coupled to the power converter 102 can turn the LED string 106 on or off with the input voltage VlN to turn the LED lamp on or off. The power converter 1〇2 receives the feedback signal from the current detecting resistor rsen and adjusts the output voltage ν〇υτ to cause the LED string 106 to produce a desired brightness. One of the disadvantages of this conventional scheme is that the desired brightness is preset (4), and the user cannot adjust the brightness in the (4) towel. FIG. 2 is a schematic diagram of another conventional LED driving circuit 2〇〇. Power converter 102 is operative to convert DC input voltage Vin to a desired output voltage VOUT for powering LED string 106. The switch 104 coupled to the power converter 1〇2 can turn the LED_106 on or off with the input power ViNit to turn the LED light on or off. The LED string 106 is coupled to the linear current regulator 2〇8. The operational amplifier 21 in the linear current regulator 208 compares the reference signal to the 0736-TW-CH Spec+Claim (filcd-20120306).doc 4 201238397 and the current monitoring signal from the current detecting resistor rsen, and generates a control signal to The resistance of the transistor Qi is adjusted in a linear manner, and the current flowing through the LED string 106 can be adjusted accordingly. Applying this conventional scheme, in order to control the light output of the LED string 106, the user needs to adjust the reference signal REF by using a dedicated device such as a specially designed switch having an adjustment button or a switch capable of receiving a remote control signal. SUMMARY OF THE INVENTION The technical problem to be solved by the present invention is to provide a controller, system and method for controlling dimming of a light-emitting diode (LED) light source, which can synchronize the light output adjustment processes of a plurality of LED light sources with each other. Even if the changes in the light output of the plurality of LED light sources are substantially the same, the plurality of led light sources emit substantially the same light intensity/brightness. In order to solve the above technical problem, the present invention provides a dimming control benefit, comprising: a control terminal, providing a driving signal, the driving signal controlling a control switch coupled to a light source; and a dimming control circuit, and The control end is coupled to and generates the driving signal according to a plurality of operations of a power switch, wherein the power switch transmits an AC signal, wherein the dimming control circuit counts the plurality of waveforms of the AC signal to adjust the driving The signal in turn controls a dimming of the light source. The present invention also provides a dimming method, comprising: transmitting an AC signal through a power switch; generating a driving signal according to a plurality of operations of the power switch, and adjusting the plurality of waveforms of the AC signal Driving a signal to control a light source; and controlling a control switch coupled to the light source through the driving signal. The invention also provides a dimming system for driving a light source, the dimming system 0736-TW-CH Spec+Claim(filed-20120306).doc 5 201238397 includes: a conversion circuit for receiving an AC signal through a power switch And providing a modulated electric energy to the light source; and a dimming control circuit coupled to the conversion circuit, generating a dimming signal according to the plurality of operations of the power switch, and transmitting a plurality of waveforms to the parent flow signal Counting, and adjusting the dimming signal, wherein a dimming of the light source is controlled by the dimming signal. By using the controller, system and method of the present invention, the electromagnetic interference effect in the circuit can be reduced as compared with the prior art. [Embodiment] Hereinafter, a detailed description will be given of an embodiment of the present invention. While the invention will be described in conjunction with the embodiments, it should be understood that Rather, the invention is to cover various modifications, modifications and equivalents as defined in the spirit and scope of the invention as defined by the appended claims. In addition, in the following detailed description of the embodiments of the invention However, it will be understood by those of ordinary skill in the art that the present invention may be practiced without these specific details. In other instances, well-known methods, procedures, components, and circuits have not been described in detail so as to highlight the substance of the invention. Figure 3 is a block diagram showing a light source driving circuit 3A according to the present invention. In one embodiment, the light source driving circuit 3 (10) includes a parent current/DC turn (four) 3〇6 for converting the self-powered AC input voltage to the DC output voltage v: as in the power supply and the AC/DC. A power switch 304 for the selective power shortage and light source driving circuit 3〇〇0736-TW-CH Spec+Claim(filed-20120306).doc 6 201238397 between the converters 3〇6, and the AC/DC converter 306 a power converter 31A coupled to provide the adjusted power to the LED string 312, coupled to the power converter 310 for receiving a switch monitoring signal indicating the action of the power switch 3〇4 and controlling the power conversion according to the switch monitoring signal A dimming controller 308 is outputted from the device 3, and a current monitor 314 for monitoring the current flowing through the LED string 312. In one embodiment, the power switch 3〇4 is the power switch on the surface. 'w In operation, the AC/DC converter 306 converts the input AC voltage to a DC output voltage VOUT. Power converter 310 receives DC voltage VOUT and provides an adjusted voltage to LED string 312. Current monitor 314 generates a current monitoring signal that indicates the magnitude of the current flowing through LED string 312. The dimming controller 308 monitors the operation of the power switch 3〇4, receives the current monitoring signal from the current monitor 314, and controls the power converter 31〇 according to the action of the power switch 304 to adjust the power of the LED string. In one embodiment, dimming controller 3〇8 operates in analog dimming mode to adjust the energy of LED $312 by adjusting a reference signal that determines the peak value of the LED current. In another embodiment, the dimming controller 308 operates in a burst dimming mode to adjust the power of the LEd string 312 by adjusting the duty cycle of the pulse width modulation signal (PWM signal). By adjusting the power of the LED string 312, the brightness of the led string μ] can be adjusted accordingly. 4 is a circuit diagram of a light source driving circuit 400 in accordance with one embodiment of the present invention. Figure 4 will be described in conjunction with Figure 3. The components in Figure 4 that are numbered the same as in Figure 3 have similar functions and will not be repeated here for the sake of brevity. 073 6-TW-CH Spec+Claim(filed-20120306).doc η 201238397 The light source drive circuit bed includes a power conversion 5 310 between the power supply and the (4) string 3i2 for receiving power from the power supply and is (4) 3曰12 provides power after viewing. In the example of FIG. 4, the power converter (10) 疋 includes an inductor L1, a diode D4, and a buck converter that controls the switch~. In the embodiment of Fig. 4, the control switch ~ is located outside the dimming controller. In other implementations, control can also be integrated into the interior of the dimming controller 308. The dimming controller 308 # receives the switch monitoring signal and monitors the switch ～ in series with the LED φ 312 according to the switch to adjust the power converter 310 (including the inductor L 二 diode 〇 4 and the control open _ output The power of the switch monitors the action of the power switch (such as the power switch 3〇4 coupled between the power source and the light source drive circuit). The light source drive circuit 400 further includes an AC/DC converter 3〇6, The AC input voltage vIN is converted to a DC output voltage ν 〇υ τ. The light source drive circuit 400 further includes a current monitor 314 for monitoring the current flowing through the LED string 312. In the example shown in Figure 4, AC/DC conversion The device 3〇6 is a bridge rectifier comprising diodes 〇1, 〇2, 〇7, 〇8, 〇10 and capacitors (9). The current monitor 314 includes a current detecting resistor r5. In one embodiment The 埠 of the dimming controller 308 includes: HV_GATE, SEL, CLK, RT, VDD, CTRL, MON, and GND. 埠 HV-GATE is coupled to the switch q27 through the resistor R3 for controlling the switch Q27 coupled to the LED string 312. On state (such as on/off state) The capacitor C]i is coupled between 埠HV_GATE and ground to adjust the gate voltage of the switch Q27. The user can also choose to couple the 埠SEL through the resistor R4 to the ground (eg 0736-TW-CH Spec+) Claim(filed-20120306).doc 8 201238397 Figure 4) Or directly to the bee SEL, you can choose the analog dimming mode or the pulse dimming mode accordingly. 埠CLK is coupled to AC/DC through resistor R3. The converter 3〇6, the same through the resistor R6_ to ground. The CLK receives a switch monitoring signal #u, the switch monitoring signal indicates the action of the power switch 3〇4. In one embodiment, the switch monitor signal is at the resistor R3 And the resistor R6 is generated. The capacitor C12 is connected in parallel with the resistor R6 for removing unnecessary noise. The RT is connected to the ground through the resistor R7 for determining the frequency of the pulse signal generated by the dimming controller 308.埠VDD is connected to the open-light diode through the diode D9 for supplying power to the dimming controller 308. In one embodiment, a faulty cell (such as capacitor c10) is connected between 埠VDD and ground. The dimming controller 308 is powered when the power switch 3〇4 is turned off. In another implementation The energy storage unit is integrated in the 5-week light controller 308. 埠GND is grounded to the ground. 玮CTRL is connected to the switch Q!6. The switch Q丨6 is connected in series with the LED string 312 and the switch Q27, and the current monitoring resistor is passed through. R5 is coupled to ground. The dimming controller 308 controls the conduction state of the switch Qw through the control signal outputted on the 埠CTRL to adjust the adjusted power output by the power converter 310.埠MON is coupled to current monitoring resistor R5 to receive a current monitoring signal indicative of the current flowing through LED string 312. When the switch q27 is turned on, the dimming controller 308 adjusts the current flowing through the LED string 312 through the control switch Qle. In operation 'when the power switch 304 is turned "on", the AC/DC converter 306 converts the input parent current voltage VIN into a DC output voltage ν 〇υ τ. ^阜 The voltage with a preset voltage value on HV_GATE is applied through the resistor R3 to the open 0736-TW-CH Spec+Claim(filed-20120306).doc 9 201238397 on Q27, and then the switch q27 is turned on. If dimming controller 308 turns on switch q16, DC voltage VOUT will power LED string 312 and charge inductor L1. Current flows through inductor L1, LED string 312, switch Q27, switch Q16, and resistor R5 to ground. If the dimming controller 308 turns off the switch q16, current flows through the inductor LI, the LED string 312 and the diode 〇4. Inductor L1 is discharged to power LED string 312. Therefore, the dimming controller 308 can adjust the adjusted electric energy output by the power converter 310 through the control switch q16. When the power switch 304 is turned off, the capacitor ci is discharged to supply power to the dimming controller 308. The voltage across resistor R6 drops to 〇, and dimming controller 308 can monitor a switch monitor signal indicating that power switch 3〇4 is off on 埠CLK. Similarly, when the power switch 3〇4 is turned on, the voltage of the resistor R6 rises to a preset voltage value, and the dimming controller $(10) can monitor the power switch 3〇4 on the 埠CLK. The switch monitors the signal. If a disconnect operation is detected, the dimming controller can pull the voltage on 埠HV-GATE to 〇 to turn off the switch (10), thereby causing the LED string 312 to be de-energized after the inductor L1 is completely discharged. After monitoring the disconnection operation of the power switch 3〇4, the dimming controller 3〇8 adjusts a reference signal indicating the desired brightness of the LED 312312. Source: The brightness of the 'LED " 2 can be adjusted at the next turn-on; the moxibustion = expected party degree is adjusted. In other words, the output of the LED string 312 is illuminated by the dimming controller according to the disconnection of the power switch 3G4. Figure 5 shows the structure of the dimming controller 3〇8 in Figure 4. Figure 5 will be described in conjunction with Figure 4. Figure 5 is the same as Figure 4 (4) 0736-TW-CH Spec+Claim ( Fi]ed-20120306).doc 10 201238397 has similar functions and will not be repeatedly described herein for the sake of brevity. The dimming controller 308 includes a trigger monitoring unit 506, a dimmer 5〇2 and a pulse signal generator 504. The trigger monitoring unit 5〇6 is coupled to the ground through the Zener diode ZD1. The trigger monitoring unit 506 receives the switch monitoring signal through the 埠CLK, the switch monitoring signal indicating the action of the external power switch 3〇4. The action of the external power switch 304 When monitored, the trigger monitoring unit 506 generates a drive signal to drive the counter 526. The trigger monitoring unit 5〇6 further controls the conduction state of the switch Q27. The dimmer 5〇2 generates a reference signal REF that is adjusted in analogy to dimming. The energy of the LED string 312. Dimmer 502 can also generate control signal 538 to adjust the power of LED string 312 by adjusting the duty cycle of pulse width modulation signal PWM 1. Pulse signal generator 504 generates a pulse signal for turning on switch qi6. Dimming controller 308 also includes A VOD coupled low voltage lock (UVL) circuit 508 for selectively activating one or more components within the dimming controller 308 based on different electrical energy conditions. In one embodiment, if the voltage on the VDD is high At the first predetermined voltage 'the low voltage lockout circuit 508 will activate all of the components in the dimming controller 3 〇 8. When the power switch 304 is turned off, if the voltage on 埠 VDD is lower than the second predetermined voltage, the low voltage lockout circuit 50$ will turn off the components of the dimming controller 308 other than the trigger monitoring unit 506 and the dimmer 502 to save power. If the voltage on 埠 VDD is lower than the third predetermined voltage, the low voltage lockout circuit 508 will turn off the trigger monitoring. The unit 506 and the dimmer 502. In one embodiment, the first preset voltage is higher than the second preset voltage, and the second preset voltage is lower than the third preset voltage. Because the dimming controller 308 can It can be powered by capacitor C10 via 埠VDD, so even the power switch 3〇4 0736-TW-CHSpec+Claim(filed-20120306).doc 11 201238397 t = after 'trigger monitoring unit 506 and dimmer 5〇2 can also m is used for a period of == system _, object [with current source 532 _. Let the direct disk (four) ^ configuration ^ EL to select the dimming mode, for example, 埠 SEL a ' ' or 埠 埠 SEL through a resistor With the secrets. In the decision. For example, the 'dimming mode' is determined by measuring the voltage on the 4 SEL SEL. °—The car SEL is directly connected to the ground'. The voltage on the SEL is approximately pm. — The control circuit (not shown) can be turned on _ 540, and the switches 541 and 542 are turned off and the dimming controller 308 can work. In the analogy first mode 'and through the difficult reference (four) Qing Lai LED string 312 ^ can. In an embodiment, the #果蜂孤透电阻 resistor (shown in Figure 4), and R4 has a predetermined resistance value, then the electrical waste on the fox is greater than zero. The control circuit opens switch 540 and turns on switches 541 and 542. Further, the dimming controller 308 operates in the pulse dimming mode, and adjusts the power of the LED string 312 by adjusting the duty cycle of the pulse width difficult signal pWM1. In other words, different dimming modes can be selected by controlling the conduction states of the switches 54, 541, 542. The conduction state of the switches 54A, 541, 542 is determined by the voltage on the 埠SEL. The pulse 彳 θ generator 504 is lightly coupled to ground through 埠RT and resistor R7 to generate a pulse signal 536 that turns on switch Q!6. The pulse signal generator 504 can have a different structure and is not limited to the structure shown in FIG. In the pulse 彳 θ generator 504, the non-inverting terminal of the operational amplifier 510 receives the preset voltage Vi, and therefore the voltage of the inverting terminal of the operational amplifier 51 也 is also Vi. The current Irt flows to ground through 埠RT and resistor R7. Flow through metal oxide semiconductor field effect transistor (MOSFET) 514 and metal oxide half 0736-TW-CHSpec+Claim (filed-20120306).d〇 (12 201238397 Conductor field effect transistor 515 current I! and current IRT The same size. The metal oxide semiconductor field effect transistor 514 and the metal oxide semiconductor field effect transistor 512 form a current mirror, so the current flowing through the metal oxide semiconductor field effect transistor 512 also has the same magnitude as the current IRT. The output of the comparator 516 and the output of the comparator 518 are coupled to the S input and the R input of the SR flip flop 520. The inverting terminal of the comparator 516 receives the preset voltage V2. The inverting terminal of the comparator 518 receives the pre An ink V3 is provided. In one embodiment, v2 is greater than V3 and V3 is greater than 0. Capacitor C4 is coupled between metal oxide semiconductor field effect transistor 512 and ground, and the terminal is coupled to comparator 516 and comparator 518. The node between the inverting terminals is lightly connected. The Q output terminal of the SR flip-flop 520 is coupled to the switch Qm and also coupled to the S input terminal of the SR flip-flop 522. The switch q1s is connected in parallel with the capacitor (^. The conduction of the switch Q15 Status by SR The Q output of the capacitor 520 is determined. The initial voltage across the capacitor C4 is approximately 〇, less than γ 3. Therefore, the R input of the $ han 520 receives the logic high output from the comparator 518. The Q output of the SR flip 520 The terminal is set to a logic low signal, and the switch Qls is turned off. When the switch Qu is turned off, the capacitor Q is charged under the action of the current L. Therefore, the voltage across the capacitor C4 rises. When the voltage across the Q is greater than V2, the SR triggers. The S input of the 520 receives the logic chirp signal of the comparator 516. The Q output of the SR flip-flop 520 is set to a logic high ,, and then the switch Qls is turned on. When the switch Qls is turned on, the capacitor 〇 4 is transparent = ^ OFF Qu discharge' and the voltage across the two ends. When the voltage across capacitor C4 drops to Vs' comparator 518 outputs a logic high signal, the Q output of sr flip-flop 520 is set to logic low 彳 § ' and then disconnected Switch Qu. Thereafter 0736-TW-CH Spec+Claim(filed-20120306).doc 13 201238397 Capacitor C4 is charged again under the action of current I2. As described above, pulse signal generator pulse signal generator 504 is triggered at SR. The Q output of the device 520 generates a pulse signal 536, the pulse The signal 536 includes a series of pulses. The pulse signal 536 is transmitted to the s input of the SR flip-flop 522. The trigger monitoring unit 506 monitors the action of the power switch 3 〇4 via 埠C LK. If the action of the power switch 304 is at 埠CLK It is monitored that the trigger monitoring unit 506 generates a drive signal to drive the counter 526. In both embodiments, when power switch 304 is turned "on", the voltage on 埠CLK rises, which is equal to the voltage across resistor R6 (shown in Figure 4). When the source switch 304 is turned off, the voltage on the 埠CLk drops to 〇. Therefore: the switch monitor signal indicating the operation of the power switch 304 can be monitored at 埠CLK. In one embodiment, the trigger monitoring unit 506 generates a drive signal when an open action is detected at 埠CLK. The i-trigger monitoring unit 506 also controls the conduction of the switch Q27 via 埠HV-GATE. When the power switch 304 is turned on, the breakdown voltage across the Zener diode zd 1 is applied to the switch Q27 through the resistor R3, and then the switch Q27 is turned on. The trigger monitoring soap 506 can pull the 埠jjv_GATE 电 to 0. Then, the switch Q27 is turned off. In one embodiment, when the disconnection of power switch 304 is detected on 蟑CLK, trigger monitoring unit 5〇6 turns off switch Q27. When the ON operation of the power switch 3〇4 is detected on the 埠CLK, the trigger monitoring unit 506 turns on the switch Q27. In one embodiment, the dimmer 502 includes a counter 526 coupled to the trigger monitoring unit 5〇6 to count the action of the power switch 304. The dimmer 502 also includes a digital analog converter 528 that is coupled to the counter 526, and a pulse width modulation signal that is associated with the digital analog converter 528. 0736-TW-CH Spec+Claim(filed-20120306).doc 14 201238397 Number generator 530. Counter 526 is driven by a drive signal generated by trigger monitoring unit 506. Specifically, when the power switch 304 is turned off, the trigger monitoring unit 506 monitors a falling edge on the bee CLK, thereby generating a drive signal. The count value of counter 526 is incremented by the drive signal (e.g., incremented by one). The digital analog converter 528 reads the count value ' from the counter 526 and produces a dimming signal based on the count value (the dimming signal can be the control signal 538 or the reference signal REF). The dimming signal can be used to adjust the target power value of power converter 310 to adjust the brightness of LED string 312. In the pulse dimming mode, switch 540 is open and switches 541 and 542 are turned "on". The inverting terminal of comparator 534 receives reference signal REF1. REF1 is a DC signal with a preset voltage value. The voltage of REF1 determines the current peak of LED string 312, which in turn determines the maximum brightness of LED string 312. In the pulse dimming mode, the dimming signal is applied to a control signal 538 on the pulse width modulation signal generator 530, which can adjust the duty cycle of the pulse width modulation signal PWM1. The brightness of the LED string 312 is made equal to or lower than the maximum brightness determined by REF1 by adjusting the duty cycle of PWM1. For example, if the duty cycle of PWM1 is 1〇〇〇/0, then LED string 312 has the maximum brightness. If the duty cycle of PWM1 is less than 100%, the brightness of LED string 312 is lower than the maximum brightness. In the analog dimming mode, switch 540 is turned "on" and switches 541 and 542 are turned "off". In the analog dimming mode, the dimming signal is the reference signal REF. The reference signal REF is an analog signal 'having an adjustable voltage. The digital analog converter 528 adjusts the voltage of the ref based on the count value of the counter 526. The voltage of REF determines the current peak of LED string 312, which in turn is also the maximum brightness of LED string 312 as it is 0736-TW-CH Spec+Claim(filed-20120306).doc 15 201238397. Therefore, by adjusting, the brightness of the LED string 312 can be adjusted accordingly. In one embodiment, the count value of the counter is increased such that the digital analog converter 528 lowers the voltage of rEF. For example, if the count value is 〇, the digital analog converter 528 adjusts the voltage of REF to V4. If the trigger monitoring unit 506 monitors the disconnection of the power switch 304 at 埠Clk to increase the count value to 丨, the digital analog converter 528 adjusts the voltage of ref to V5' and V5 is less than V4. In another embodiment, the count value of the counter is increased such that the digital analog converter 528 raises the voltage of REF. In one embodiment, when the count value of counter 526 reaches a maximum value, the count value is reset to 〇. If the counter 526 is a 2-bit count, the count value will increase from 0 to 1, 2, 3, and then return to 〇 after the fourth disconnect operation. Correspondingly, the brightness of the LED string 312 is sequentially adjusted from the first stage to the second level, the third level, the fourth level, and then back to the first level. The inverting terminal of the comparator 534 can selectively receive the reference signal REF or the reference signal REF1. In analog dimming mode, the inverting terminal of comparator 534 receives reference signal REF through switch 540. In the pulse dimming mode, the inverting terminal of the comparator 534 receives the reference signal REF1 through the switch 541. The non-inverting terminal of comparator 534 is coupled to current monitoring resistor R5 via 埠MON to receive current monitoring signal SEN from current monitoring resistor R5. The voltage of the current monitoring signal SEN represents the amount of current flowing through the LED string 312 when the switches q27 and q16 are turned on. The output of comparator 534 is coupled to the R input of SR flip-flop 522 by 0736-TW-CH Spec+Claim(filed-20120306).doc 16 201238397. The Q output of SR flip flop 522 is coupled to AND gate 524. The pulse width modulation signal generated by the pulse width modulation signal generator should be applied to the gate 524 (4). Gate 524 outputs a control signal and controls Ql6 via 埠CTRL. If the analog dimming mode is selected, switch 54 is turned "on" and switches 541 and 542 are turned "off". The switch 卩^ is controlled by the SR flip-flop 522. When the power switch 304 is turned on, the breakdown voltage across the Zener diode ZD1 causes the switch Q27 to be turned on. Under the action of the pulse signal 536 generated by the pulse signal generator 5〇4, the SR flip-flop 522 generates a logic high signal at the output terminal, so that the switch Qle is turned on. The current flows through the inductor LI, the LED string 312, and the switch Q27' Switch Q10 'current monitoring resistor R5 to ground. Because the inductor L1 prevents the current from jumping, the current will gradually increase. The voltage across the current monitoring resistor R5 (ie, the voltage of the current monitoring signal SEN) will increase. The voltage is greater than the voltage of the reference signal REF, the comparator 534 outputs a logic high signal to the R input of the SR flip-flop 522, and the SR flip-flop 522 outputs a logic low signal, so that the switch qi6 is turned off. After the switch qi6 is turned off, the inductor L1 The discharge is to supply power to the LED string 312. The current flowing through the inductor U, the LED string 312 and the diode D4 is gradually reduced. When the SR flip-flop 522 receives a pulse at the S input, the switch q16 is turned on, and the LED string 312 is turned on. The current flows through the current monitoring resistor R5 to ground. When the voltage of the current monitoring signal SEN is greater than the voltage of the reference signal REF, the switch Q16 is again turned off by the SR flip-flop 522. As described above, the reference signal ref determines the flow through the LED. The peak value of 312 current, that is, the brightness of LED string 312. By adjusting REF, the brightness of LED string 312 is adjusted accordingly. In analog dimming mode, if power switch 304 is turned off, capacitor 0736-TW-CH Spec+Claim(filed-20120306).doc 17 201238397 CIO (shown in Figure 4) discharges to the turbidity monitoring unit 506 when the 埠CUC monitors 8 field triggers, the counter 52_value is added;:=3〇4_open^ ^^ The disconnection action of the power switch 304 causes the trigger monitoring unit to be turned off. The change in the count value causes the digital analog converter 528 to adjust the voltage of the reference signal from the first voltage value to the first voltage value. When the power switch is turned on again, the brightness of the LED string 312 is adjusted due to the adjustment of the reference signal. If the pulse dimming mode is selected, the switch 54 is turned off, and the switches 541 and 524 are turned on. The phase terminal receives the reference signal REF switch having a preset voltage value. The switch is controlled by the SR flip-flop 522 and the pulse width modulation signal PWM1. The reference signal determines the peak current of the LED string 312, which is determined. Maximum brightness of LED _ 312. Pulse The duty cycle of the rush width modulation signal PWM1 determines the on/off time of the switch Q! 6. When the pulse width modulation signal PWM1 is a logic high signal, the conduction state of the switch Q10 is output by the Q output of the SR flip flop 522. It is determined that when the pulse width modulation signal PWM1 is a logic low signal, the switch Qi6 is turned off. By adjusting the duty cycle of the pulse width modulation signal PWM1, the power of the LED string 312 can be adjusted accordingly. Therefore, the reference signal REF1 and the pulse width modulation signal PWMi together determine the brightness of the LED string 312. In the pulse dimming mode, when the power switch 304 is turned off, the turn-off operation is monitored by the trigger monitoring unit 506 at 埠CLK. Trigger monitoring unit 506 turns off Q27 and generates a drive signal. Under the action of the drive signal, the count value of counter 526 is incremented (e.g., incremented by one). The digital analog converter 528 generates a control signal 538 that causes the duty of the pulse width modulation signal pWMi. 0736 'TW-CH Spec+Claim(filed-20120306).doc 18 201238397 The period changes from the first stage to the second stage. The brightness of the LED string 312 will be re-connected with the power switch 3G4 and the target brightness value will be adjusted by the brightness value of the parameter. PWM1 is determined jointly. ~F1 and pulse width modulation signal Contains the signal waveform diagram under ===. The output of the device 522 is *v and ; 6G2, the pulse "No. 536, the ON state of the SR touch: the output V-, and the rr · 味立,, and Figure 4 and Figure 5. 504 generates a pulse signal 536. Under the action of the pulse signal, the SR flip-flop 522 generates a logic signal at the Q output, and the SR flip-flop (2) generates a logic high signal at the (four) output to cause the switch Ql6 to be turned on. When the switch Q16 is turned on, the inductor L1 is charged, and the electric pump L 6〇2 is increased. When the current reaches the peak value, that is, the current monitoring signal SEN = voltage is equal to the voltage of the reference signal REF, the comparator 53^

The output logic is nicked to the R input of the SR flip flop 522 such that the SE flip flop 522 outputs a logic low signal at the Q output. The sr flip-flop 522 outputs a logic low signal at the Q output that causes the switch qi6 to open, while the inductor L1 discharge supplies power to the LED string 312 and the current 602 decreases. In the analog dimming mode, by adjusting the reference signal REF, the average current value flowing through the LeD string 312 is adjusted accordingly, and the brightness of the LED string 312 is also adjusted. Figure 7 shows a schematic diagram of the signal waveform in pulse dimming mode. It includes a current 602 flowing through the LED string 312, a pulse signal 536, an output V522 of the SR flip-flop 522, an output V524 of the gate 524, an on/off state of the switch Qi6, and a pulse width modulation signal PWM1. Figure 7 will be described in conjunction with Figure 0 0736-TW-CH Spec+Claim (filed-20120306).doc 19 201238397 4 and Figure 5. When PWM1 is a logic high signal, the correlation between the on/off states of the flow through the coffee beans 536, V522, 524 and switch q16 is similar to that of Fig. 6. When pwMi is logic low, the turn of the gate 524 becomes a logic low signal. In turn, the switch is made. The child is disconnected and the current 602 is reduced. If pWM1 maintains a logic low signal, the array 6 is long enough that current 602 will decrease to 〇. In the pulse dimming mode = adjust the duty cycle of mm, the average current flowing through the LED (4) 2 = get the corresponding _, and then the brightness of the LED string 312 is also adjusted. FIG. 8 is a schematic diagram showing the operation of a light source driving circuit according to an embodiment of the present invention. Figure 8 will be described in conjunction with Figure 5. In the example shown in Fig. 8, whenever the trigger monitoring unit 506 detects power, the off action of the off 304, the count value of the counter 526 is incremented by i. Counter 526 is a two-bit counter with a maximum count of three. The digital analog converter 528 reads the count value from the counter 526 in the analog dimming mode. The increase in the count value causes the digital analog converter 528 to lower the voltage of the reference signal REF. The voltage of the reference signal REF determines the peak value 1max of the LED string 312 current, i.e., determines the average value of the LED string 312 current. In the pulse s ambient mode, the digital analog converter 528 reads the count value from the counter 526. The increase in the count value causes the digital analog converter 528 to lower the duty cycle of the pulse width modulation signal PWM1 (e.g., 25% lower each time). Count | § 526 is reset after the maximum count value (eg 3) is reached. Figure 9 is a flow diagram of a method 900 of power control of a light source in accordance with one embodiment of the present invention. Figure 9 will be described in conjunction with Figures 4 and 5. 0736-TW-CHSpec+Claim(fi]ed-20120306).doc 20 201238397 In step 902 'the adjusted electrical energy provided by the power converter (eg, power converter 31A) is applied to the light source (eg, LED string 312) powered by. In step 904, a switch monitoring signal indicative of the switching power supply action is received (e.g., received by dimming controller 308). The switch monitor signal indicates the action of a power switch (such as power switch 3〇4) located between the power source and the power converter. In step 906, a dimming signal is generated based on the switch monitoring signal. In step 908, a switch (e.g., switch Qw) in series with the light source is controlled based on the dimming signal to adjust the adjusted power provided by the power converter. In an embodiment employing an analog dimming mode, the power converter is adjusted by comparing the dimming apostrophe with a current monitoring signal representative of the magnitude of the source current. In another embodiment employing a pulse dimming mode, the power converter is adjusted by controlling the duty cycle of a pulse width modulated signal with the dimming signal. As described above, the present invention discloses a light source driving circuit that adjusts the power of a light source according to a switch monitoring signal that does not operate a power switch (such as a power switch fixed to a wall). The power of the source is provided by a power converter and is adjusted by a dimming controller by controlling a switch in series with the source. Users can adjust the brightness of the light source by acting on the normal power switch (such as disconnecting) without having to use additional devices (such as specially designed switches with dimming buttons) to save costs. Figure 10 is a circuit diagram of a light source driving circuit 1000 in accordance with one embodiment of the present invention. Figure 10 will be described in conjunction with Figure 3. The components numbered in FIG. 1A and FIG. 4 have similar functions. 0736-TW-CHSpec+Claim(filed-20120306).doc 21 201238397 The light source driving circuit 1000 includes power conversion lightly connected to the power source and the LED string 312. The device 310' receives power from the power source and provides adjusted power to the led string 312. The dimming controller 1008 monitors the action of the power switch 304 between the power source and the light source driving circuit 1A by monitoring the voltage on the 埠CLK. The dimming controller 1008 receives the dimming request signal and the dimming termination signal through the 埠CLK. The dimming request signal indicates a first set of actions of the power switch 304, the dimming termination signal indicating a second set of actions of the power switch 3〇4. If the dimming request signal is received, the dimming controller 1〇〇8 continuously adjusts the adjusted electric energy output by the power converter 310. If the dimming termination signal is received, the dimming controller 1〇〇8 stops adjusting the adjusted power output from the power converter 310. In other words, if the first set of actions of the power switch 304 is detected, the dimming controller 1 开始 8 begins to continuously adjust the adjusted power output by the power converter 310 until the second set of actions of the power switch 3 〇 4 is detected. In one embodiment, dimming controller 110 adjusts the adjusted electrical energy output by power converter 310 by controlling control switch q16 in series with LED string 312. FIG. 11 is a schematic structural view of the dimming controller 1〇〇8 of FIG. 10, and FIG. 11 will be described with reference to FIG. The components numbered the same as those of Figs. 4, 5, and 10 in Fig. 11 have similar functions. In the example of Fig. 11, the structure of the dimming controller 1〇〇8 is similar to that of the dimming controller 308 of Fig. 5. The difference is in the dimmer 11〇2 and the trigger monitoring unit 1106. In Fig. 11, the trigger monitoring unit u〇6 receives the dimming request signal and the dimming termination signal through the 槔CLK, and generates a signal EN to activate or deactivate the clock generator 11〇4. The trigger monitoring unit 11〇6 also controls the conduction state of the switch Q27 coupled to the LED string 312. 0736-TW-CH Spec+Claim(filed-20120306).doc 22 201238397 The social class is more than the money transfer type, and the 4th student refers to the money REF. ^ΐ^Λ312(4) can. In the pulse dimming mode, the dimmer 1102 controls 538 to adjust the duty cycle of the pulse width modulation signal pwMi, thereby adjusting the power of the LEM 312. The figure includes the generated clock signal connected to the trigger monitoring unit _ = clock generation benefit 1104, the counter ι 26 driven by the clock signal, and the digital analog converter 52 of the juice number β 1126_ = one shirt The digital analog converter 528 is coupled to the secret width modulation L or is generated as 530. When the power switch 304 is turned "on" or "off", the trigger monitoring unit 11A6 can detect a voltage rising edge or a falling edge at the bee CLK, respectively. For example, when the power switch 304 is turned off, the capacitor C1 〇 is discharged as a dimming controller ιι 8: electric. The voltage across resistor R6 drops to 〇, which in turn triggers the monitoring unit i hall to detect a voltage falling edge on 埠CLK. Similarly, when the power switch 304 is turned "on", the voltage across the resistor R6 rises to a predetermined voltage, which in turn triggers the monitoring unit 1106 to monitor = a voltage rising edge on 埠CLK. As previously discussed, by monitoring the voltage on 埠CLK, 106 can monitor the action of power switch 304, such as a turn-on or turn-on action. In one embodiment, 'when the first set of actions of the power switch 304 is monitored, that is, the trigger monitoring unit 1106 receives the dimming request signal through the cymbal. When the second set of actions of the power switch 304 is monitored At this time, the trigger monitoring unit 1106 receives the dimming termination signal through the 埠CLK. In one embodiment, the first set of actions of the power switch 304 includes a turn-off action and a subsequent first turn-on action. One embodiment 0736-TW-CH Spec+Claim(filed-20120306)-d〇c 23 201238397 in 'Power On 1 304 W The second group action includes a second disconnect action and a second turn-on action thereafter /' If the trigger monitoring unit 11〇6 receives the dimming request signal, the dimming control benefit 1108 starts to continuously adjust the adjusted electric power b of the power converter 31〇. In the analog dimming mode, the dimming control The device 11〇8 adjusts the adjusted electric power b of the power converter 31〇 by adjusting the voltage of the reference k number REF. In the pulse dimming mode, the dimming controller 1108 is responsible for adjusting the pulse width modulation signal PWM1. Cycle to adjust power The adjusted electric energy outputted by the converter 31. If the trigger monitoring unit 11〇6 receives the dimming termination signal, the dimming controller 1108 stops adjusting the adjusted electric energy output by the power converter 31〇. A schematic diagram of the operation of a light source driving circuit according to an embodiment of the present invention, the light source driving circuit including the dimming controller 1008 shown in Fig. 9. Fig. 12 will be described with reference to Fig. 1 and Fig. The power switch 3〇4 is turned off. When the power switch 3〇4 is turned on by the user, the power converter 310 supplies power to the LED string 312, and the LED string 312 has an initial brightness. In the analog dimming mode, the initial brightness is referenced. The initial voltage of the signal REF is determined. In the pulse dimming mode, the initial brightness is determined by the initial duty cycle of the pulse width modulation signal PWM1 (eg, 100% duty cycle). The reference signal REF and the pulse width modulation signal PWM1 are digital. The analog converter 528 is generated based on the count value of the counter 1126. Therefore, the initial voltage of REF and the initial duty cycle of pwM1 are determined by the initial count value of the counter 1126 (eg 〇) Decide. In order to adjust the brightness of the LED string 312, the user can apply the first set of actions to the power switch 0736-TW-CH Spec+Claim(filed-20120306).doc 24 201238397 304. Second, the operation of dimming under the action of the group 请t and the second method after it: the group action includes the first disconnection unit 1 and the voltage 疋 发 = detection monitoring rising edge 1206. The library (4) falls/D 1204 and the subsequent power is generated repeatedly and there is a Μ#'; the shame request signal, the trigger monitoring unit 1106 generates the time number 'and thus starts the clock generator 1 to respond to the counter (10) driven by the clock signal. The mother clock pulse of the time = sign changes its count value in the example ^: the value is incremented by the clock signal. In: Sub: Leaf After the most tree value, the count value is ^

1 large count value, _ count value is decremented until counter (10): preset minimum count value. Inverse J In the analog dimming mode, the digital analog converter 528 reads the value from the counter 1126 and responds to the rising of the counter value of the count value. In the pulse dimming mode, the digital analog converter 528 reads the count value from the count benefit 1126, and gradually decreases the pulse width of the pulse width machine (4) PWM1 as the count value increases (different (4). Because the adjusted power output of the power converter is determined by the voltage of the reference signal fEF (in analog dimming mode) or by the pulse width modulation signal PWM1, the pulse is changed. The brightness of string 312 can be adjusted accordingly. Once the LED string 312 reaches the desired brightness, the user terminates the brightness adjustment by applying a second set of actions to the power switch 304. Under the action of the second set of actions, a delta-perimeter termination 彳§ is generated. In one embodiment, the second set of motions 0736-TW-CH Spec+Claim(filed-20120306).doc 25 201238397 includes a first (fourth) action and a second subsequent action. As a result, the trigger monitoring unit 1106 monitors the voltage drop edge and the subsequent voltage rising edge at 珲CLK. At the end of the dimming, the trigger monitoring unit generates a low level and the closed clock generates n 11G4. The count of the clock signal _ crying '126 keeps its count value unchanged. In the analogy, the reference signal will remain unchanged. In the pulse touch mode, the pulse: =: r does not hold this, "This, will be shown in Figure 13 is a flowchart of a method for power control of a light source according to an embodiment of the present invention. Figure 13 will be combined with Figure 1. () and FIG. 2 are described. In step 1302, the adjusted power is output by the power conversion ϋ (such as power converter 310) to supply power to the light source (eg, LED string 312). In step 304, the receiving tone is adjusted. An optical request signal (eg, received by dimming control f 1108). The dimming request signal indicates a first set of actions of a power switch (such as power switch 3 〇 4) that is engaged between the power source and the power conversion partner. In an example, the first set of actions of the power switch includes a first disconnect action and a subsequent first turn-on action. In step 1306, the adjusted power = 2 power control output is continuously adjusted (eg, using dimming control) (4) Adjustments should be made. In a real case, the start-up clock generates $11〇4 to drive the counter ιΐ26. The dimming signal (such as the control signal or the reference signal REF) is generated according to the count value of the decator 1126. In the analogy of dimming, The signal REF and the current monitoring signal indicating the flow through the light source adjust the adjusted power of the power converter to 0736-TW-CH Spec+Claim(filed-20120306).doc 26 201238397. The voltage of REF is determined by the count value. In the pulse dimming mode, the duty cycle of the pulse width modulation signal PWM1 is adjusted by the control signal 538 to the adjusted power output by the power converter. The duty cycle of the PWM1 is determined by the count value. In step 1308, the dimming termination signal is received. (eg, received by dimming controller 1108.) The dimming termination signal indicates a second set of actions that are coupled to a power switch (such as power switch 3〇4) between the power source and the power converter. In one embodiment, The second set of actions of the power switch includes a second disconnect action and a second turn-on action thereafter. In step 1310, if a dimming termination signal is received, the adjusted trimming power converter output is stopped. In one embodiment, the clock generator 1104 is turned off to cause the counter 1126 to maintain its count value unchanged. The result is that in the analog dimming mode, the reference signal REF The voltage remains unchanged; in the pulse dimming mode, the duty cycle of the pulse width modulation signal PWM1 remains unchanged. Therefore, the light source can maintain the desired brightness. As described in m, the present invention discloses a light source driving circuit. If the dimming request signal is received, the light source driving circuit will automatically and continuously adjust the power of the light source. If the dimming termination signal is received, the light source driving circuit will stop adjusting the power of the light source. The user can pass the power switch (such as The power switch on the wall is applied to the first group of actions to start the brightening process. During the brightness adjustment process, the brightness of the light source is gradually increased or decreased. If the desired party is obtained, the user terminates the brightness adjustment process by applying a second set of actions to the power switch. The user does not have to use additional devices (such as an external dimmer or a specially designed dimming button 0736-TW-CH Spec+Claim(filed-20120306).doc 27 201238397 for brightness adjustment, saving Fig. 14A is a circuit diagram of a light source driving system 1400 according to an embodiment of the present invention. Fig. 14A will be described with reference to Fig. 1A. The components numbered the same as those in Fig. 10 in Fig. 14A have similar functions, for simplicity. See not repeating the description herein. In one embodiment, the drive system 14 receives AC power through the power switch 3〇4 and generates modulated power for the LED light source. The power switch 304 can be a wall-mounted power supply. Fig. 14B shows an embodiment of a power switch 304. The power switch 304 can be controlled to be turned "on" or "off" by placing the component 1480 in an "on," or "off" position. The component 1480 can be controlled by the user. As shown in FIG. 14A, the drive system 1400 includes a power conversion circuit such as an AC/DC converter 306, a DC/DC converter 1410, and a dimming control circuit such as a dimming controller 1408. A power conversion circuit The power switch 304 receives a parent flow signal, such as an AC input voltage VIN' provided by an AC power source, and provides modulated power to the LED light source 1412, such as the modulated current Ireg. As shown in Figure 14A, the LED light source 1412 includes a LED string. In more detail, the AC/DC converter 306 in the power conversion circuit receives an AC power source (such as an AC input voltage vIN) and converts the AC power into DC power (such as a DC output voltage VOUT). The DC converter 1410 controls the control switch Q16 according to the dimming signal (not shown in FIG. 14A) to convert the DC power (such as the DC output voltage VOUT) into the modulated power (such as the modulated current Ireg). The Q16 can be coupled in series with the LED light source through the DC/DC converter 1410. The dimming controller 1408 generates a dimming signal and controls dimming of the LED light source 1412 according to the dimming signal. The dimming controller 1408 is based on the power supply 0736-TW- CHSpec+Claim(filed-20120306).doc 28 201238397 A set of operations of switch 304 produces a dimming signal that is transmitted through a pair of waveforms (eg sinusoidal full wave, sine half wave or cross The period of the stream signal V1N is counted to adjust the dimming signal. In the present description, the AC signal V1N is illustrated as a sinusoidal signal, but the invention is not limited to a sinusoidal AC signal. For example, a full bridge circuit of the AC/DC converter 306 (eg, The diodes A, a and Ds are included to receive the AC input voltage VlN from the AC power source, and a sinusoidal half wave (for example, only one polarity) is generated on the filter capacitor C9, and the filter capacitor C9 can be turned to the DC/DC converter 141. A DC output voltage V〇UT is provided. A resistor divider comprising resistors R3 and R6 provides a dimming request or dimming termination signal, and the dimming request or dimming termination signal represents a series of operations of the power switch 304. Similar to the operation of the power switch 304 described in FIG. 1A, the operation of the power supply_3〇4 in the head 14A includes disconnecting the power switch 304 and connecting within a predetermined time period ΔΤ (eg, 2 seconds=) after the power is turned off. The power switch 304 is turned on. In response to the dimming request signal, dimming controller 1408 can enable the dimming process of LED source 1412. The dimming controller 1408 can terminate the dimming process of the LED light source 1412 in response to the dimming final signal. In addition, when the power switch 304 is turned "on", the resistive divider provides a dimming controller 1408 with a periodic signal 1454 representative of the sinusoidal half-wave of the V-N. As shown in FIG. 14A, the power converter 141 is a buck converter and includes a control switch q16, a diode 1414, a current monitor (such as a resistor), inductors L1 and L2 coupled to each other, and a capacitor 1424. In one embodiment, control _q16 may be integrated into dimming controller 14A8. Inductors L1 and L2 are electromagnetically coupled, such as through common node 1433. Although the common node 1433 shown in FIG. A is located between the resistor and the inductor u, in another embodiment of 0736-TW-CHSpec+Claim(filed-20120306).doc 29 201238397, the common node 1433 may also be located at the control switch q16 and The common node 1433 provides a reference ground potential for the dimming controller 1408. In one embodiment, the reference ground potential of the dimming controller 14A8 is different from the ground potential of the drive system 1400. The control switch Qi6 is tunably rectified by the modulated current Ireg of the inductor L1 to adjust the electric energy supplied to the LED light source 1412. The capacitor 1424 absorbs the ripple on the modulated current Ireg to smooth the current flowing through the led light source 1412. And substantially equal to the average value of the modulated current Ireg. In addition, the inductor L2 detects the electrical state of the inductor L1, for example, whether the current flowing through the inductor L1 falls to a predetermined minimum level. The inductor L2 also generates a representative inductor. State detection signal AUX. Resistor 1428 provides current monitoring signal SEN, which represents the modulated current ireg flowing through inductor L1. As shown in Figure 14A, 'dimming controller 1408 has 埠C LK, ZCD, GND, CTRL, VDD, MON, COMP and FB. 埠ZCD is connected to the inductor L2 and receives the detection signal AUX. The 珲MON transmission capacitor is coupled to the reference ground potential of the dimming controller 1408 and is dimmed. The device 14〇8 provides a compensation voltage REF2. The 埠FB receives the monitoring signal AVG, which represents the average value of the current ireg flowing through the inductor L1. 埠ClK monitors the power switch 304, such as the state of the monitoring power switch 3〇4 is conductive Also, when the power switch 304 is turned on, as shown in FIG. 14A, the power switch 304 also receives a periodic signal 1454 representing a sine wave of the alternating signal Vin. In another embodiment, the dimming controller 14A8 Different switches are included to monitor the switching power supply 304 and the receiving period signal 1454. The control 埠CTRL is connected to the control switch q10 and generates a driving signal cTRL, such as a PWM signal, to control the control switch Q!6, thereby controlling the LED light source 1412 0736- Dimming of TW-CH Spec+Claim(filed-20120306)_doc 30 201238397. The drive signal CTRL is generated based on the operation of the switching power supply 304, the periodic signal 1454, the detection signal AUX, and the monitoring signals SEN and AVG. From the AC / DC converter 306 or the power inductor L2. Dimming control terminal GND and the reference ground adapter 1408. In more detail, in one embodiment, the power switch is in the ON state 3〇4. In operation, when switch Qm is turned on, current Ireg flows through switch Q16, resistor 1428, inductor L1, and LED source 1412, to the ground of drive system 1400 and current lreg increases. When switch qi6 is open, current Ireg continues to flow through resistor 1428, inductor U, LED source 1412, and diode 1414, and current lreg decreases. In one embodiment, if the monitor signal SEN indicates that the current lreg has increased to the highest level, the dimming controller 丨4〇8 turns off the switch Qie to reduce the current lreg. If the detection signal Αυχ indicates that the current lreg falls to the preset lowest level, the dimming controller 14〇8 turns on the switch Qi6 to increase the current lreg. Therefore, the current ireg can be adjusted from the preset minimum level to the most south level. In one embodiment, the highest level is adjustable. For example, if the monitor signal AVG shows that the average value of the current Ireg is lower than the preset level, the dimming controller 1408 increases the highest level to increase the average value of the current Ireg. If the average value of the monitor signal AVG display current Ireg is higher than the preset level, the dimming controller 14〇8 reduces the highest level Imax to reduce the average value of the current Ireg. Therefore, the current through the light source 1412 can be rectified to a preset level. That is, the light output of the LED light source 1412 can be adjusted to a corresponding preset level. Still further, in one embodiment, the user can control the power switch 304 to control the dimming of the LED light source 1412, such as controlling the preset level of light output. In more detail, the user can perform a series of operations on the power switch 3〇4, 0736-TW-CH Spec+Claim(filed-20120306).doc 31 201238397. The dimming controller 1408 generates a drive signal CTRL in accordance with the operation of the power switch 304. For example, when the user first turns on the power switch 3〇4, the dimming controller 1408 generates a driving signal CTRL that is independent of the dimming signal (such as the reference signal REF or the PWM signal PWM1), and controls the light output of the LED light source 1412 to the pre-light. Set the level, such as the highest level. Thereafter, if the user turns off the power switch 304 and turns the power switch 304 on again within the predetermined time period ΔΤ after the disconnection, the dimming controller 1408 generates a dimming signal to control the drive signal CTRL. The dimming controller 1408 also adjusts the dimming signal and the driving signal CTRL by counting the waveform of the alternating current signal Vin, thereby controlling the dimming of the LED light source 1412, for example, adjusting the modulated current ireg. In one embodiment, dimming controller 1408 counts the period of periodic signal 1454 to achieve a half-wave count of AC signal VlN. In another embodiment, the dimming controller 1408 receives the AC signal vIN directly or indirectly and counts the half or full wave of the AC signal γΙΝ. Fig. 15 is a view showing an example of the configuration of the dimming control circuit 1408 of Fig. 14A according to an embodiment of the present invention. Fig. 15 will be described in conjunction with Fig. 1A and Fig. Ma. The components numbered in Fig. 15 and Figs. 10 and 14A have similar functions, and will not be repeatedly described herein for the sake of brevity. As shown in Fig. 15, the dimming control circuit 1408 includes a trigger monitoring unit 15〇6, a regulator 1502, and a drive signal generating circuit. The drive signal generating circuit includes an error amplifier 1550, a comparator 534, an SR flip-flop 522, and a gate 524 and a flip-flop circuit 1504. The trigger monitoring unit 1 transmits the CLK to monitor the operation of the wire switch 3〇4 and responds to the detected series of operation pulses TRIG of the power switch 3〇4. In an embodiment, the series of operations includes disconnecting the power supply 0736-TW-CH Spec+Claim(fiIed-20120306).doc 32 201238397 switch 304 and turning 304 on within the closed time period Λτ. If this series of operations is performed, the trigger monitoring unit 15〇6 can detect the negative side of the voltage and the positive side of the voltage at 埠^, which is followed by the positive side of the voltage. The dimmer 1502 can count the waveform of the alternating current signal Vin according to the pulse TRIG. For example, the dimmer 15〇2 counts the waveform of the alternating current signal V1N by counting the periodic signal °1454=. For example, the control unit 15〇6 can generate a pulse TRIG to enable or disable the control. The dimmer 1502 includes a digital analog converter 528 and a pWM generator 530, and includes a dimming indicator 1526 and a pulse generator 15. 〇 4. In one embodiment, clock generator 1504 receives periodic signal 1454 and generates a clock signal 1544 representative of periodic signal 1454. For example, the clock generator 15〇4 can generate one pulse per cycle of the cycle 彳5, 1454. The dimming indicator 1526 counts the waveform of the AC signal vIN by counting the pulse of the clock signal 1544. In one embodiment, dimming indicator 1526 also produces a numerical digit output 1548 representative of the dimming value based on the result of the counting. For example, if the count result exceeds a preset value, dimming indicator 1526 increments the digital digit output 1548 representing the dimming value and recounts. If the number of rounds (10) is increased, the digital analog converter 528 can increase the duty of the dimming signal reference signal REF or the PWM money PWM1; if the digital output 1548 is reduced, the digital analog converter 528 can reduce the dimming signal. Therefore, the dimmer 1502 can adjust the dimming signal by adjusting the waveform of the AC signal Vin to adjust the drive signal CTRL. The trigger circuit 504 is coupled to the 埠ZCD of the dimming control circuit 14A8. In an embodiment, if the 埠ZCD detects that the modulated current Ireg decreases by s 0736-TW-CH Spec+Claim(filed-20120306).doc 201238397 to pre-sx to a low level, such as 〇A, the trigger circuit 504 A pulse signal 1536 is generated, such as a logic high signal, which in turn sets the output Q of flip-flop 522 to logic 咼 and turns on switch Q10. In addition, if the current monitoring signal SEN received by 埠MON of the dimming control circuit is increased to an adjustable highest level, such as the compensation voltage REF2, the comparator 534 outputs a logic high signal to reset the output q of the flip-flop 522 to the logic. Low, and then open the switch. Therefore, the modulated current lreg can be adjusted within the range of the preset minimum level (eg, 〇 A ) to the highest level depending on the compensation voltage REF2. In the analog dimming mode, the dimming controller 14A controls dimming of the LED light source 1412 by comparing the reference k number REF with the monitor signal AVG. The monitor signal AVG represents the current flowing through the LED light source 1412. In more detail, the error amplifier 1550 compares the reference signal REF with the monitor signal AVG. If the monitor signal AVG is smaller than the reference signal REF, the error amplifier increases the compensation voltage REF2; if the monitor signal AVG is greater than the reference signal ref, the error amplifier reduces the compensation voltage REF2. Therefore, the current flowing through the LED light source 1412 can be adjusted to a level that depends on the reference signal REF. Accordingly, the reference signal REF can adjust the light output of the LED source 1412. In the pulse dimming mode, dimming controller 1408 controls dimming of LED source 1412 based on output Q (such as the PWM signal of flip flop 522) and PWM signal PWM1. In more detail, when the PWM signal PWM1 is logic high, the output Q adjusts the modulated current Ireg and the average value of the modulated current Ireg depends on the reference signal REF1. When the PWM signal PWM1 is logic low, no modulated current flows through the LED light source 1412. Therefore, if the period of the PWM signal PWM1 is increased, the light output of the LED light source 1412 can be increased; if the period of the PWM signal PWM1 is decreased, the light of the LED light source 1412 is 0736^TW-CH Spec+CIaim(filed-20120306). Doc 34 201238397 can be reduced. Figure 16 is a diagram showing an example of the structure of the dimmer 1502 of Figure 15 in accordance with an embodiment of the present invention. Figure 16 will be described in conjunction with Figure 15. As shown in Figure 16, the clock generator 1504 includes a comparator, and the dimming indicator 1526 includes an always counter. The PWM generator 530 includes a sawtooth generator and a comparator. The clock generator 1504 compares the periodic signal 1454 representing the AC signal VIN with the voltage reference vREF to generate a clock signal 1544. In one embodiment, each pulse of the clock signal 1544 is responsive to one cycle of the periodic signal 1454. For example, if the frequency of the AC signal VIN is 5 Hz, the frequency of the periodic signal 1454 is 100 Hz, and the frequency of the clock signal 1544 is also 100 Hz. In one embodiment, if the count result of the waveform of the alternating signal Vin exceeds a preset value (eg, 1〇〇), the dimming indicator 1526 increases the numerical value output of the dimming value by a preset amount (eg, 丨) and Recount. Thus, the 'digital analog converter 528 can control the dimming signal (e.g., the duty cycle of the reference signal REF or the PWM k number PWM1) between the first predetermined level and the first pre-level. In this embodiment, the dimming value can be increased by one per second, so the light output of the LED light source 1412 can also be increased by a predetermined amount per second. Returning to Figure 15, Figure 15 is described in conjunction with Figure 16. In operation, when the user first turns on the power switch 304, the dimming indicator 1526 can set the digital output 1548 to a preset dimming value, such as a maximum dimming value. For example, in the analog dimming mode, the preset reference signal REF is at a maximum value, such as equal to the reference signal REF1. In another example, in the pulse dimming mode, the period of the preset pwM signal PWM1 is 1〇〇%. Thus, the LED light source 1412 of Figure 14A can emit maximum light intensity/brightness. If the user disconnects the power switch 304 and is in the predetermined time period after disconnection 0736-TW-CH Spec+Claim(filed-20120306).doc 35 201238397

If the power switch is taken in △T, the triggering unit (10) will follow the negative side of the residual voltage and the positive side of the voltage. The positive side of the voltage follows the voltage/after. Therefore, the trigger monitoring unit 15〇6 generates a first pulse based on the operation of the power switch 3〇4. The first pulse can enable the number of slices of the alternating current signal VlN' to adjust the dimming (4), such as the reference signal REF or PWM PWM1. In an embodiment, in response to the first pulse, the dimming indicator 6 causes the numerical digit wheel 丨 548 to increase from the lowest dimming value and the light output of the LED source 1412 begins with the corresponding minimum intensity/brightness. increase. When the dimming signal is adjusted to the desired level (such as the LED light source 调整. The light output is adjusted to the desired light intensity/brightness), the 电源 can be disconnected from the power switch 304 and reconnected within a predetermined time ΔΤ after disconnection. The power switch 304 is turned on. Accordingly, the trigger monitoring unit 1506 generates a second pulse based on the operation of the power switch 304. The second pulse can be used to count the waveform of the AC signal Vin. Thus, dimming indicator 1526 maintains the dimming signal at a desired level, thereby maintaining the light output of LED source 1412 at the desired intensity/brightness. Further, if the user turns off the power switch 304 and turns the power switch 304 on again within the predetermined time period AT after the disconnection, the dimming indicator 1526 can re-count the clock signal 1544 and cause the digital output to be 1548. Increase again from the lowest dimming value. However, in one embodiment, if the digital digit output 1548 reaches the maximum dimming value, the dimming indicator 1526 can stop counting the clock signal 1544 and maintain the digital output 1548 at the maximum dimming value. The light output of the 1412 is also maintained at maximum light intensity/brightness. After that, if the user disconnects the power switch 3〇4 and turns on the power switch again within the predetermined time period ΔΤ after disconnection 0736-TW-CH Spec+Claim(filed-20120306).doc 36 201238397 304 'trigger monitoring unit 1506 can cause dimming indicator 1526 to recount clock signal 1544. The dimming indicator 1526 allows the digital round to increase again from the lowest dimming value. Figure 17 is a diagram showing an operation example of the light source driving system 1400 of Figure 14A according to an embodiment of the present invention. Figure π will be described in conjunction with Figures 14A, 15 and 16. It is assumed that the initial state of the power switch 304 is off. In operation, when the power switch 304 is turned on for the first time (which can be turned on by the user), in one embodiment, the LED light source 1412 is powered by the modulated electrical energy output from the power converter 1410 and produces an initial light output 类 in analogy In the light mode, the initial light output may depend on the initial voltage of the reference signal RE F . In pulse dimming mode, the initial light output may depend on the initial duty cycle (e.g., 100%) of the PWM signal pWM1. The reference signal REF and the PWM signal PWM1 can be generated based on the dimming value of the dimming indicator 1526. Therefore, the initial voltage of the reference signal REF and the initial duty cycle of the PWM signal PWM1 may depend on the initial dimming value (e.g., 10) provided by the dimming indicator 1526. To adjust the light output of the LED light source 1412, the user can perform a first set of operations of the power switch 304. The dimming request signal is generated in accordance with the detected first off operation and the first on operation of the power switch 304. The first turn-on operation is completed within a predetermined time after the completion of the first disconnection operation. Thus, dimming request signal generation can be detected, and the dimming request signal includes a voltage negative side 1704 and a positive side 1706 of 埠CLK, wherein the positive side 1706 follows the negative side 1704. In response to the dimming request signal, the trigger monitoring unit 15〇6 generates a pulse TRIG. Thus, dimming indicator 1526 can begin counting clock signals 1544. As shown in Figure π, the dimming indicator 1526 can increase the dimming 0736-TW-CH Spec+Claim(filed-20120306).doc 37 201238397 value k minimum value (such as 1) and respond to the clock signal丨Three pulses of 544 trigger the monitoring unit 15〇6 to increase the dimming value by i. However, the present invention is not limited to this. In another embodiment, 'in response to the N pulses of the clock signal 1544 (N is a predetermined value), the dimming indicator 1526 can increase the dimming value by two, three or other numbers. In yet another embodiment, the dimming indicator 丨 526 can decrease the dimming value from a preset value (eg, 10) and respond to one pulse of the clock signal 1544 (M is a predetermined value), dimming Indicator 1526 can reduce the dimming value by two, three or other numbers. In analog s backlight mode, in one embodiment, digital analog converter 528 reads the dimming value received from dimming indicator 1526, and if the dimming value increases, digital analog converter 528 causes the reference signal The voltage of REF increases. In the pulse dimming mode, in one embodiment, the digital analog converter 528 reads the dimming value received from the dimming indicator 1526, and if the dimming value increases 'the digital analog converter 528 causes the PWM signal PWM1 The duty cycle has increased.

If the desired light output has been obtained before the dimming value reaches a maximum (e.g., 1 〇) then the user can perform a second set of operations of the power switch 304, thereby terminating the adjustment process. The dimming termination signal is generated in accordance with the detected second off operation and the second on operation of the power switch 3〇4. The second turn-on operation is completed within a predetermined time ΔΤ after the completion of the second disconnection operation. Thus, the dimming termination signal generation ' and the dimming termination signal comprising the voltage negative side 1708 and the positive side 1710 of 埠CLK, wherein the positive side 1710 follows the negative side 1708, can be detected. In response to the dimming termination signal, the trigger monitoring unit 15〇6 generates a pulse TRIG that disables the dimming indicator 1526 and maintains the dimming indicator 1526 dimming. Accordingly, in the analog dimming mode, the voltage of the reference signal REF 0736-TW-CH Spec+Claim(filed-20120306).doc 38 201238397 can be maintained as the desired level. The duty cycle can be kept as the expected value due to t. == The light output of (4)2 can be maintained at the desired level. The value of this source is determined by the snow step adjustment of the light output of the coffee source 1412, and the user can perform the first τ 纟 ρ of the power switch 304 from the %% qiU. The dimming request signal is generated according to the third disconnection operation and the third turn-on of the detected original switch 304, and the pass operation completes the stomach light request signal generation in the predetermined _δτ after the third disconnection operation is completed, and the dimming request is generated. The signal includes a voltage negative side 1712 and a positive side ΐ7ΐ4, where the positive side (four) and Ik are after the negative side 1712. Accordingly, the dimming control circuit 14〇8 counts the pulse 3谠1544 to adjust the dimming level, and adjusts the dimming level to adjust the light output of the LED light source 1412. Fig. 18 is a diagram showing an operation example of the light source driving system of Fig. 14A, which is not a first embodiment of the present invention. Fig. 18 will be described with reference to Figs. 14A, 15, 16, and 17. Similar to Fig. 17, 'as shown in Fig. 18, it is assumed that the switch of the power switch 3〇4 is off. In operation, when the power switch 304 is turned on for the first time (which can be turned on by the user), in one embodiment, the LED light source 1412 is powered by the modulated electrical energy output from the power converter 1410 and produces an initial light output.

To adjust the light output of LED light source 1412, the user can perform a first set of operations of power switch 304. The dimming request signal is generated in accordance with the detected first off operation and the first on operation of the power source switch 304. The first turn-on operation is completed within a predetermined time AT after the completion of the first disconnect operation. Therefore, the dimming request signal can be detected, and the dimming request signal includes 埠CLK 0736-TW-CHSpec+Claim(filed-20120306).doc 39 201238397 ^pressing the negative side and the positive side (10)6, wherein the positive side 脳Follow the negative side 1804. The 5-week light control circuit just adjusts the dimming level by counting the clock signal 1544, and adjusts the dimming level to adjust the modulated electric energy supplied to the LED light source 1412. As shown in Figure 18, 'If the dimming value is increased to the maximum value (such as (6), the dimming device 1526 can keep the dimming value equal to the maximum value. In another implementation, the dimming value is from the maximum value (such as 1G). Start to fall. The face value drops to the most J, the value (such as 1) 'The dimming finger 1526 keeps the dimming value equal to the minimum: therefore, in the analogy mode, the reference signal is kept at the highest voltage. The level or the lowest level; in the pulse-tuned mode, the duty cycle of the PWM signal PWM1 is kept at the maximum duty cycle 〇 just %) ^ small duty cycle (such as ·). Accordingly, the light output of the LED light source (4) 2 remains at the highest or lowest level. The user can restart the adjustment process by performing a second set of operations of the power switch 3〇4. The dimming request signal is generated according to the second disconnection # of the detected electrical off 3G4 and the second taken. The second on operation is completed within a predetermined time period after the second disconnection operation. Therefore, the dimming request signal can be detected and the dimming request signal includes the voltage negative side 丨8卯 and the positive side 1810 of 埠CLK, wherein the positive side 181〇 follows the negative side 18〇8. The dimming control circuit just adjusts the dimming level by counting the clock signal measurement, and adjusts the dimming level, and (4) adjusts the modulated electric energy supplied to the (four) light source. 19 is a circuit diagram of the circuit of the LED wire drive system 1900. Fig. 19 will be described in conjunction with Fig. 1A and Fig. 4A. The components in Fig. 19 which are the same as those in Figs. 1A and 14A have the function of phase = 0736-TW-CH SpecH-Claim(filed-20120306).doc 40 201238397. Similar to the drive system 1400 shown in FIG. 14A, the drive system 19 includes power conversion circuits such as an AC/DC converter 3〇6 and a DC/DC converter 1910, and a dimming control circuit such as a dimming controller 19 〇 8. As shown in Fig. 19, the DC/DC converter 191 and the dimming controller 19〇8 have similar functions to the DC/DC converter 310 and the dimming controller 1〇〇8 in Fig. 10. In addition, the dimming controller W08 receives the periodic signal 1454. For example, the dimming controller 1908 receives the periodic signal 1454 through the 埠CLK, and the controller 1908 calibrates the period of the periodic signal 1454 to complete the sine of the alternating signal VIN. Waves are counted. The dimming controller can adjust the modulated electric energy Ireg supplied to the LED light source 1412 by counting the sine wave of the AC signal vIN. The adjustment process of the modulated electric energy Ireg is similar to the adjustment process in the description made in connection with Fig. 14A. In one embodiment, control switch Q10 can be integrated into dimming controller 19A8. Fig. 20 is a view showing an example of the configuration of a dimming control circuit 1908 of Fig. 19 according to an embodiment of the present invention. 2A will be described in conjunction with FIG. 15, FIG. 15, and FIG. Components in Fig. 20 having the same reference numerals as in Figs. n, 15 and 19 have similar functions. As shown in Fig. 20, the configuration of the dimming control circuit 19〇8 is similar to that of the dimming control circuit 1108 in Fig. u except for the configuration of the trigger monitoring unit 15〇6 and the dimmer 15〇2. The trigger monitoring unit 15 "6 and dimmer 1502 of Fig. 20 have similar functions as the trigger monitoring unit 1506 and the dimmer 1502 in the dimming control circuit of Fig. 15. Fig. 21 is a circuit diagram showing an example of an LED light source driving system 2100 according to an embodiment of the present invention. Fig. 21 will be described with reference to Figs. 14A, 15, and 20. In Fig. 21, the same reference numerals as in Fig. 14A and Fig. 19 are used. The components of 0736-TW-CH Spec4-Claim (filed-20120306).doc 41 201238397 have similar functions. In one embodiment, drive system 2100 includes a plurality of power converters 2110 to power a plurality of LED light sources, such as LED strings 2112 and 2118. The driving system 2100 further includes a plurality of dimming controllers 2108, which control the waveforms of the alternating current signal VIN (such as counting the period of the periodic signal 1454), thereby controlling the modulated electrical energy supplied to the LED light source (such as the modulated current Iregl and Ireg2). Power converter 2110 can have a similar function or structure to power converter 1410 in Figure 14A and power converter 1910 in Figure 19. The dimming controller 2108 can have similar functions or structures to the dimming controller 1408 of Figures 14A and 15 and the dimming controller 1908 of Figures 19 and 20. The two LED strings shown in Figure 21 are merely illustrative and the drive system 2100 can drive other numbers of LEDs or LED strings. Accordingly, drive system 2100 includes a corresponding number of DC/DC converters and dimming controllers. Advantageously, the adjustment of the light output of the plurality of LED light sources can be synchronized with each other by counting the waveform of the alternating current signal VIN to adjust the light output of the plurality of LED light sources. That is, the variations in the light output of the plurality of LED light sources can be substantially the same. Therefore, multiple LED light sources can emit substantially the same light intensity/brightness 1. Further, the internal oscillator circuit in the dimming controller 2108 can be omitted. Figure 22 is a flow chart showing a method of controlling dimming of an LED light source according to an embodiment of the present invention. 22 will be described with reference to FIGS. 14-8, 15, 16, 17, 17, 18, 20, and 21. In step 22〇2, the AC signal VIN is transmitted through the power switch. In step 2204, the dimming controller generates a drive signal CTRL based on the -series operation of the power switch 3〇4. In 帛22〇6 Steps, the dimming control 0736-TW-CH Spec+Claim(filed-20120306).doc 42 201238397 The controller adjusts the waveform of the AC signal and adjusts the drive signal CTRL to achieve the LED light source 1412. The control of dimming. In the first step, the drive signal CTRL controls the control switch Q16 coupled to the LED source 1412. Accordingly, embodiments of the present invention provide controllers, systems, and methods for controlling dimming of LED sources. In one embodiment, the drive system can include a plurality of dimming controls n to divide the plurality of LED light_light outputs. Each dimming controller can count a waveform (such as a sinusoidal waveform of an AC input voltage from an AC power source) and respond to a predetermined number of waveforms of the AC input voltage 'Each dimming control H can make the corresponding LED light source Light transmission (4) is large or reduced by a predetermined amount. Advantageously, the plurality of LED light-dimmings can be synchronized with each other, and the plurality of LED light sources can emit substantially the same light intensity/brightness. The above detailed description and the drawings are merely illustrative of the common embodiments of the invention. Obviously, various additions, modifications and money can be made without departing from the scope of the invention as defined in the scope of the patent application. In the application domain, the surgeon should understand that the present invention can be used in practical applications according to specific environmental and work requirements;;; the back of the invention, the following, ^ layout, proportion, materials, elements, components and other aspects Change °. Therefore, the facts of this (4) are more than the lang instead of (4), the scope of the patent application and its legal equivalents are defined, and the description is based on this month 1j. BRIEF DESCRIPTION OF THE DRAWINGS The present invention will be described in detail with reference to the accompanying drawings and drawings. Wherein 0736-TW-CH Spec+Claim(filcd-20120306).doc 43 201238397 Figure 1 [Main component symbol description] 100: Drive circuit 102: Power converter 104: Switch 106: LED string 200: Drive circuit 208: Linear current regulator 210: operational amplifier 300: light source driving circuit 304: power switch 306: AC/DC converter 308: dimming controller 310: power converter 312: LED string 314: power switch 400: light source driving circuit 502: Dimmer 504: pulse signal generator pulse signal generator 508: low voltage lockout circuit 510: metal oxide semiconductor field effect transistor 512: metal oxide semiconductor field effect transistor 514: metal oxide semiconductor field effect transistor 515: Metal Oxide Semiconductor Field Effect Transistor 0736-TW-CHSpec+Claim(filed-20120306).doc 44 201238397 516: Comparator 518: Comparator 520: Trigger 522: Trigger 524: Gate 526: Drive Counter 528: Digital to analog converter 530: Pulse width modulation signal generator 532: Current source 534: Comparator 536: Pulse signal 538: Control letter No. 540: Switch 541: Switch 541: Switch 542: Switch 602: Current 900: Method for power control of the light source 900 902~908: Step 1000 Light source drive circuit 1102 Dimmer 1104 Clock generator 1106 Trigger monitoring unit 1008 Light Controller 1126 Counter 0736-TW-CH Spec+Claim(filed-20120306).doc 45 201238397 1300: Method for Power Control of Light Sources 1302~1310: Step 1400: Light Source Drive System 1408: Dimming Controller 1410: Power Converter 1412: LED Light Source 1414: Diode 1424: Capacitor 1428: Current Monitor 1433: Common Node 1454: Periodic Signal 1480: Element 1502: Dimmer 1504: Trigger Circuit 1506: Trigger Monitoring Unit 1526: Dimming Indicator 1536: Pulse signal 1544 ·· Clock signal 1550: Error amplifier 1704: Negative side 1706: Positive side 1708: Negative side 1710: Positive side 1712: Negative side 1714: Positive side 0736-TW-CH Spec+Claim(filed-20120306 ).doc 46 201238397 1804 : Negative side 1806 : Positive side 1808 : Negative side 1810 : Positive side 1900 : Drive system 1908 : Dimming controller 1910 : DC / DC converter 2100: Drive system 2108: Dimming controller 2110: Power converter 2112: LED string 2118: LED string 2202~2208: Step AUX: Detection signal AVG: 埠Ci-C, 〇: Capacitor CLK: 埠CTRL: 埠CTRL: Drive signal COMP : 珲 CLK : 埠 Di ~ Di ( > : diode R1 ~ R7 : resistance Ql6 · switch Q27 : switch 073 6-TW-CH Spec + Claim (filed-20120306).doc 47 201238397

Ll: Inductance L2: Inductance HV-GATE : 埠 VDD : Tan SEL : 埠 RT : 埠 MON : 埠 GND : Completion 1 ~ 2 . Current Irt . Current RT : 埠 PWM1 : Pulse width modulation signal GND : 埠 SEL :埠VDD :埠HV—GATE :埠CLK :埠ZD 1 : Zener diode

Vi~V*3.Electric drop

Imax : current peak value V522 . Output V524 · Output EN : Signal SEN : Current monitoring signal Vin · Input voltage 0736-TW-CH Spec + Claim (filed-20120306).doc 48 201238397 V〇UT : Output voltage Rsen : Resistor REF : Reference signal Qi: Transistor ZCD : 埠 VDD : 埠 FB : 埠

VreF: voltage reference TRIG: pulse SEN: current monitoring signal Ireg · current 0736-TW-CH Spec+Claim(filed-20120306).doc

Claims (1)

201238397 Seven Applicable Patent Range: A dimming controller, including · · control terminal, providing a control switch for driving signal interface; and the driving signal control and a plurality of operation of a light source ± _ sub-based - power switch The 啼 占 占 占 占 四 四 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该 该The dimming controller of the item, wherein the alternating current is an alternating current voltage provided by a parent current source. "3. For example, the dimming controller of the patent application scope, wherein the system circuit counts the plurality of pulses of a clock signal, and the plurality of waveforms of the upper stream number are counted to the intersection 4· For example, the dimming controller of the third application patent scope, wherein the comparison of the circuit represents the flow of the signal of the streamer, and the signal of the production line. The wing reference 5.= the dimming control of the patent item The dimming control circuit counts the plurality of waveforms of the AC signal, and adjusts the driving signal by a dimming signal. 5° 正 6. The dimming controller of claim 5, Wherein, when a result of performing the counting on the 0736-TW-CH Spec+Claim (filed-20120306).doc 50 201238397 waveforms exceeds a predetermined value, the dimming control circuit controls the dimming signal at - The first preset position is a second preset level. For example, the dimming controller of claim 5, wherein the dimming control circuit comprises: Τ 'trigger monitoring unit' to monitor the electric Generate - pulse to return to the power switch And the illuminator is coupled to the trigger monitoring unit and performs the counting on the plurality of waveforms to adjust the dimming signal based on the pulse. 8. The dimming control H of the L-Patent Model 7 item, The towel, if the trigger generates a -first pulse based on the plurality of operations, the first pulse of the count of the plurality of waveforms to adjust the approximate signal to a bit ^, if the trigger control monofilament is generated in the operation - The second pulse, the sunny waveform _ number, the coffee first signal protection 9. If the patent application scope 5th identifies the white basin, the control benefits, wherein the dimming signal controller compares the reference signal with the Table H source-current-monitoring source of the dimming. 咖径制》海九10. If the scope of application for patents is 5th. / work thorn state, its application, the 丼 丼 含 含 含Pulse width modulation (PWM) signal, 唬 PWMW and - riding surface (four) of the dimming. 广. 736-TW-CHSpec+CIaim(filed-20120306).doc 51 201238397 11. As claimed in the patent scope 1 item of dimming controller, wherein 'the plurality of operations of the power switch include disconnection The power switch is turned off and the power is turned off. A preset compensation is based on the t source switch. 12. A method of dimming, comprising: transmitting an AC signal through a power switch; according to the plurality of operations of the power off, Producing - == counting of a plurality of waveforms, and controlling the two-motion signal to control the control switch with the light source through the driving signal. 13. As in the dimming method of claim 12, (1) the step of the moving signal includes: v, 5 weeks, the drive compares the one-cycle signal of the AC signal with one to generate a clock signal; and the voltage reference signal I letter ===:: the count of the pulse 'in, AC 14. As claimed in the 12th The dimming method of the item, the step of the moving signal includes: adjusting the driving signal by transmitting the dimming signal through the plurality of waveforms of the alternating current signal. 5 weeks 壹 15. The dimming method of claim 14 of the patent scope, wherein the step of the driver signal includes: ° Hai 5 weeks complete the 0736^TW-CHSpec+Claim(filed-20120306).doc 52 201238397 Although the result of the counting of the plurality of waveforms exceeds a predetermined value, the dimming signal is controlled between a first preset level and a second preset level. 16. The dimming method of claim 14, wherein the step of generating the driving signal comprises: if a first pulse is generated based on the operation, enabling the counting of the plurality of waveforms, thereby adjusting the The dimming signal is aligned to a level; and if a second pulse is generated based on the operation, the count of the waveform can be de-asserted to maintain the dimming signal at the level. 17. A dimming system for driving a light source, the dimming system comprising: a conversion circuit that receives an AC signal through a power switch and provides a modulated energy to the light source; and a dimming control circuit The conversion circuit is coupled to generate a dimming signal according to the plurality of operations of the power switch, and adjust the dimming signal by counting the plurality of waveforms of the AC signal, wherein a dimming of the light source is modulated Controlled by optical signals. 18. The dimming system of claim π, wherein the conversion circuit comprises: an AC/DC converter that converts an alternating current electrical energy into a direct current electrical energy; and a direct current/direct current converter, and the alternating current/direct current The converter is coupled to control a control switch coupled in series with the light source according to the dimming signal to convert the DC power into a modulated electrical energy. 19. The dimming system of claim 17, wherein the dimming control circuit compares a period signal and a voltage representing the alternating current signal. The reference signal further generates a clock signal, and the dimming control circuit counts the plurality of pulses of the clock signal to further count the plurality of waveforms of the AC signal. 20. The dimming system of claim 17, wherein the dimming control circuit controls the dimming signal when a result of the counting of the plurality of waveforms of the alternating signal exceeds a predetermined value Between a first preset level and a second preset level. 073 6-TW-CH Spec+Claim(filed-20120306).doc 54