TWI446831B - Digital AC dimming control circuit - Google Patents

Description

Digital AC dimming control circuit

The invention is a dimming control circuit, in particular to a digital AC dimming control circuit.

Today's light source technology is booming, and lighting system design faces the challenge of dimming technology in every new light source technology. The mature dimming technology can make the brightness of the lighting meet the needs of various environments, and can effectively achieve the purpose of energy saving. The conventional dimming control circuit utilizes the principle of phase cutoff dimming, which must include an AC 矽 control fluid (instead of a variable resistor that is not resistant to high power), can realize the function of phase control, and select the trigger phase of the AC voltage. This part of the phase is turned on, which can reduce power consumption.

The so-called AC thyristor fluid (TRIAC) is a two-conductor three-pole AC switch, so it can be directly used in AC circuits. Its internal structure is connected by a PNP and another NPN semiconductor in parallel, and then the gate G is added. A full wave controller consisting of. As soon as the gate is triggered, the AC 矽 control fluid will work normally until the gate current is zero, and the gate of the AC 矽 control fluid is current. Trigger, almost independent of voltage.

The main control component of the traditional dimming control circuit is an AC 矽 control fluid. The RC circuit generates a trigger voltage at the gate of the AC 矽 control fluid to make the AC 矽 control fluid turn on. Due to the time delay caused by RC, when The larger the R is, the smaller the charging current of the capacitor C is, the slower the potential of the C is enough to trigger the AC 矽 control fluid, so the larger the trigger angle on the AC thyristor fluid gate, the conduction between the other two poles. The smaller the angle.

Referring to FIG. 1 , the conventional dimming control circuit includes an AC power source 1 , at least one variable resistor 11 , at least one capacitor 12 , and an AC 矽 control fluid 13 ; wherein the variable resistor 11 is connected in series with the capacitor 12 , and then In parallel with the AC power supply 1 , the AC control fluid 13 includes a gate terminal 131 , a first connection end 132 and a second connection end 133 , wherein the gate terminal 131 is electrically connected to the capacitor 12 and the variable resistor 11 . The first connection end 132 is electrically connected to the other end of the variable resistor 11, and the second connection end 133 is electrically connected to a lighting device 14. The lighting device 14 is also electrically connected to the other end of the capacitor 12.

Through the phase control of the AC 矽 control fluid 13, the AC signal output by the AC power source 1 can adjust the conduction angle by adjusting the variable resistor 11, thereby adjusting the brightness of the illuminating device.

AC 矽 control fluid is widely used in the dimming of traditional incandescent bulbs. However, incandescent bulbs have poor luminous efficiency and waste energy. They have been gradually replaced by energy-saving bulbs or LED bulbs. Although energy-saving bulbs have high luminous efficiency, they are not easy to adjust. Light, and LED bulbs not only have the highest luminous efficiency, but also have the advantage of being able to use the AC 矽 control fluid to dim.

In view of the above, the object of the present invention is to provide a digital AC dimming control circuit, which realizes analog AC 矽 control fluid by switching the waveform control of the dimming waveform control circuit and then switching through the power circuit switch or through the output of the amplifier. The dimming control is used to test and verify the response of the bulb to the AC 矽 control fluid dimmer.

The technical means for improving the functionality of the previously developed technology of the digital AC dimming control circuit of the present invention includes: a dimming setting device that generates a conduction angle control parameter under user setting a dimming waveform control unit having a control parameter value input end, a synchronizing signal input end and a dimming waveform signal output end, wherein the control parameter value input end of the dimming waveform control unit is electrically connected to the tune The light setting device receives the conduction angle control parameter value generated by the dimming setting device, and the dimming waveform control unit inputs a synchronization signal and the conduction angle control parameter value according to the synchronization signal input end, in a predetermined In each cycle of the AC frequency, a dimming waveform signal having a first level and a second level is generated by the dimming waveform signal output end; a power loop switch unit electrically connected to the power circuit switch unit a power supply and a load device, and a dimming waveform signal output terminal of the dimming waveform control unit, the power supply is back A switch unit having an open position and a turned position.

The dimming waveform signal of the first level or the second level outputted by the dimming waveform signal output end of the dimming waveform control unit controls the power loop switch unit to be in each period of the predetermined AC frequency In the conducting position or the open position, the electric energy supplied to the load device by the alternating current supply is controlled.

The output of the dimming waveform signal is realized by the conduction angle control, thereby achieving the purpose of dimming control, the output signal is the same as the AC 矽 control fluid dimmer, and the dimming is set to digital, instead of the conventional AC 矽 control The way in which the fluid dimming circuit rotates and changes the variable resistance can achieve automation when testing and verifying the response to the dimmer, which not only saves manpower, but also saves time and time, reduces test and verification. Cost is indeed an invention that combines practicality and progress.

Please refer to FIG. 2 , which is the main waveform signal principle of the digital AC dimming control circuit of the present invention. The AC signal S1 generates a synchronization signal S2 by the synchronous signal acquisition unit 3, and then controls the output by the dimming waveform control unit 42. The dimming waveform signals S3, S4 having the first level D1 and the second level D2 are finally outputted by the switch control unit 41 to output an output waveform signal S5, S6, thereby controlling the selection process to adjust the brightness of the illumination device. purpose.

Please refer to FIG. 2 to FIG. 4 at the same time. The digital AC dimming control circuit of the present invention includes: a dimming setting device 43 that generates a conduction angle control parameter value under user setting. S7; a dimming waveform control unit 42 having a control parameter value input end 423, a synchronizing signal input end 422 and a dimming waveform signal output end 421, the control parameter value input end 423 of the dimming waveform control unit 42 Is electrically connected to the dimming setting device 43 and receives the conduction angle control parameter value S7 generated by the dimming setting device 43. The dimming waveform control unit 42 inputs a synchronization signal according to the synchronization signal input terminal 422. S2 and the conduction angle control parameter value S7, in each period T of a predetermined AC frequency, a dimming waveform signal having a first level D1 and a second level D2 is generated by the dimming waveform signal output terminal 421. Output; a power circuit switch unit 5, the power circuit switch unit 5 is electrically connected between an AC power supply 2 and a load device 6, and the dimming waveform signal of the dimming waveform control unit 42 Terminal 421, the power supply circuit having a switching unit 5 is turned to a position 52 open position 51.

The digital AC dimming control circuit of the present invention, wherein the dimming waveform signal of the first level S3 or the second level S4 output by the dimming waveform signal output end 421 of the dimming waveform control unit 42 controls the power circuit The switching unit 5 is located at the conducting position 52 or the open position 51 in each period T of the predetermined alternating frequency, thereby controlling the electrical energy supplied by the alternating current supply source 2 to the load device 6.

The digital AC dimming control circuit of the present invention, wherein the AC supply power source 2 is composed of a mains, a transformer or a voltage regulator, and the AC supply power source outputs an AC signal to an output terminal.

The digital AC dimming control circuit of the present invention, wherein the AC supply power source 2 and the synchronization signal input terminal 422 of the dimming waveform control unit 42 are electrically connected to a synchronous signal acquisition unit 3, and the AC supply power source 2 is After the output of the AC signal S1 is synchronously captured, the synchronization signal S4 is input to the synchronization signal input terminal 422, and wherein the dimming waveform control unit 42 implements waveform control by using one of a counter or a timer. action.

The digital AC dimming control circuit of the present invention, wherein the dimming waveform signals S3, S4 can be switched according to the conduction angle control parameter value S7 output by the dimming setting device, and wherein the power circuit switching unit 5 and the tuning The light waveform control unit 42 is electrically connected to a switch control unit 41 for driving the power circuit switch unit 5 to perform a switching operation.

Please refer to FIG. 5 , which is a schematic diagram of a third embodiment of the digital AC dimming control circuit of the present invention, including: a dimming setting device 43 that generates a conduction under the setting of a user. The angle control parameter value S7; a dimming waveform control unit 42 having a control parameter value input terminal 423, an AC signal input terminal 424 and a dimming waveform signal output terminal 421, the control parameter of the dimming waveform control unit 42 The value input terminal 423 is electrically connected to the dimming setting device 43 and receives the conduction angle control parameter value S7 generated by the dimming setting device 43. A waveform generator 7 is electrically connected to the waveform generator 7 The AC signal input terminal 424 of the dimming waveform control unit 42 outputs an AC signal S1. The dimming waveform control unit 42 controls the parameter value S7 according to the AC signal S1 and the conduction angle control parameter value S7. The dimming waveform signal having the first level D1 and the second level D2 is outputted by the dimming waveform signal output terminal 421; an amplifier 8 is electrically connected to the dimming waveform The output terminal 421 receives the dimming waveform signal S3 generated by the dimming waveform control unit 42 and amplifies the signal modulated by the dimming waveform signal S3 to output an output waveform signal S5 to a load device 6. A dimming AC power supply 200 is formed.

The digital AC dimming control circuit of the present invention, wherein the dimming waveform signal S3 of the first level D1 or the second level D2 output by the dimming waveform signal output end 421 of the dimming waveform control unit 42 controls the waveform. The alternating current signal S1 generated by the generator 7 controls the electrical energy to the load device 6 via the amplifier 8.

It can be seen from the above embodiments that the present invention has excellent industrial utilization value, and therefore the present invention has met the requirements of the patent. The above description is only for the preferred embodiment of the present invention, and those skilled in the art can make other various improvements according to the above description, but these changes still belong to the inventive spirit of the present invention and the following definitions. In the scope of patents.

1. . . AC power

11. . . Variable resistance

12. . . capacitance

13. . . AC 矽 control fluid

131. . . Gate

132. . . First connection

133. . . Second connection

14. . . Lighting device

2. . . AC power supply

200. . . Dimming AC power supply

3. . . Synchronous signal acquisition unit

41. . . Switch control unit

42. . . Dimming waveform control unit

421. . . Dimming waveform signal output

422. . . Synchronous signal input

423. . . Control parameter value input

424. . . AC signal input

43. . . Dimming setting device

5. . . Power circuit switch unit

51. . . Open position

52. . . Conduction position

6. . . Load device

7. . . Waveform generator

8. . . Amplifier

D1. . . First standard

D2. . . Second level

S1. . . Exchange signal

S2. . . Synchronization signal

S3. . . Dimming waveform signal

S4. . . Dimming waveform signal

S5. . . Output waveform signal

S6. . . Output waveform signal

S7. . . Conduction angle control parameter value

T. . . cycle

Figure 1 is a schematic view showing an embodiment of a conventional dimming control circuit;

2 is a schematic diagram showing the waveform of the digital AC dimming control circuit of the present invention;

3 is a schematic view showing a first embodiment of the digital AC dimming control circuit of the present invention;

4 is a schematic view showing a second embodiment of the digital AC dimming control circuit of the present invention;

Fig. 5 is a view showing a third embodiment of the digital AC dimming control circuit of the present invention.

2. . . AC power supply

3. . . Synchronous signal acquisition unit

41. . . Switch control unit

42. . . Dimming waveform control unit

421. . . Dimming waveform signal output

422. . . Synchronous signal input

423. . . Control parameter value input

43. . . Dimming setting device

5. . . Power circuit switch unit

51. . . Open position

52. . . Conduction position

6. . . Load device

S1. . . Exchange signal

S2. . . Synchronization signal

S3. . . Dimming waveform signal

S5. . . Output waveform signal

S7. . . Conduction angle control parameter value

Claims (9)

A digital AC dimming control circuit includes: a dimming setting device that generates a conduction angle control parameter value under a user setting; a synchronous signal capturing unit connected to an AC supply power source The synchronous signal acquisition unit synchronously extracts an alternating current signal output from the alternating current power supply to generate a synchronous signal; a dimming waveform control unit having a control parameter value input end, a synchronous signal input end, and a a dimming waveform signal output end, wherein the control parameter value input end of the dimming waveform control unit is electrically connected to the dimming setting device, and receives the conduction angle control parameter value generated by the dimming setting device, the dimming The waveform control unit generates a dimming waveform signal having a first level and a second level in each cycle of a predetermined AC frequency according to the synchronization signal input by the synchronization signal input terminal and the conduction angle control parameter value. Outputted by the dimming waveform signal output terminal; a power circuit switch unit electrically connected to the AC supply a dimming waveform signal output end between the source and a load device and a dimming waveform control unit, the power circuit switch unit has a conduction position and an open position; a switch control unit electrically connected to the power circuit switch unit and Between the dimming waveform signal output end of the dimming waveform control unit, wherein the dimming of the first level or the second level output by the dimming waveform signal output end of the dimming waveform control unit Waveform signal, The power circuit switching unit is controlled to be in a conducting position or an open position in each cycle of the predetermined alternating frequency by the switch control unit, thereby controlling the electric energy supplied to the load device by the alternating current supply. The digital AC dimming control circuit of claim 1, wherein the AC power supply is composed of a mains, a transformer or a voltage regulator, and the mains outputs the AC signal to the output. The digital AC dimming control circuit of claim 1, wherein the dimming waveform control unit implements a waveform control operation by a counter counting function. The digital AC dimming control circuit according to claim 1, wherein the dimming waveform control unit implements a waveform control action by a timer function of a timer. The digital AC dimming control circuit of claim 1, wherein the first level and the second level are switched according to the conduction angle control parameter value output by the dimming setting device. A digital AC dimming control circuit comprises: a dimming setting device, wherein the dimming setting device generates a conduction angle control parameter value under a user setting; and a dimming waveform control unit having a control parameter value input a control signal value input end of the dimming waveform control unit is electrically connected to the dimming setting device, and receives the output signal from the dimming setting device The conduction angle control parameter value; a waveform generator electrically connected to the alternating current signal input end of the dimming waveform control unit, and outputting an alternating current signal, wherein the dimming waveform control unit controls the parameter value according to the alternating current signal and the conduction angle, During each period of a predetermined AC frequency, a dimming waveform signal having a first level and a second level is generated by the dimming waveform signal output end; and an amplifier is electrically connected to the dimming waveform The signal output terminal receives the dimming waveform signal generated by the dimming waveform control unit, and amplifies the dimming waveform signal, and then outputs an output waveform signal to a load device; wherein the dimming waveform control unit adjusts The dimming waveform signal of the first level or the second level outputted by the output of the optical waveform signal controls the alternating current signal generated by the waveform generator to control electrical energy to the load device via the amplifier. The digital AC dimming control circuit of claim 6, wherein the dimming waveform control unit implements a waveform control operation by a counter counting function. The digital AC dimming control circuit of claim 6, wherein the dimming waveform control unit implements a waveform control operation by a timer function. The digital AC dimming control circuit of claim 6, wherein the first level and the second level are switched according to the conduction angle control parameter value output by the dimming setting device.