CN201075877Y - Synchronous LED lamp string controller - Google Patents

Abstract

The utility model provides a synchronous LED light string controller. The synchronous LED light string controller includes: a clock synchronization circuit, receiving a reference signal with a fixed frequency, and generating a system clock according to the reference signal; a counting circuit, counting the system clock and generating a timing signal; a control logic circuit, receiving the timing signal to generate a control signal; and a driving circuit, receiving the control signal to drive at least a light emitting diode. Through the utility model, not only can the cost be taken into account, but also the effect of LED light string synchronization can be achieved.

Description

Synchronized LED String Lighting Controller

technical field

The utility model relates to a controller for LED light strings, in particular to a synchronous LED light string controller for synchronous actions of LED light strings.

Background technique

The application of light strings has always been very wide, such as Christmas light strings, landscape light strings, building light strings, etc. With the advancement of light-emitting diode (LED, Light Emitting Diode) technology and the cheaper prices, LEDs are used in lighting String is also a new trend, but because LED is basically suitable for DC power supply, and light string is used in the environment of AC power supply, how to apply LED to light string, some products have been seen in the market. But how to achieve synchronous change is an obstacle to be overcome. The utility model has done an in-depth research on this subject, and has obtained concrete results, so an application for a patent is proposed.

The current LED light string has the prior art shown in Fig. 20, Fig. 21 and Fig. 22, wherein each light-emitting unit represents a group of RGB (Red Green Blue) three-color LED units. According to the existing technology, the technology shown in Figure 20 is the most unsatisfactory, because all the LED units are connected in parallel due to the DC parallel connection, so the current consumption is large, that is to say, it is very difficult for the power converter to supply a large current. The processing cost is high, or the LED units that can be connected in parallel are limited.

The technology shown in Figure 21 is better than the technology shown in Figure 20, because the LED units are connected in series, so the current is small, so the power converter is easy to handle and the cost is low. However, this technology still has a defect, that is, the number of LED units that can be connected in series is limited, and it depends on the DC voltage supplied by the power converter. The higher the DC voltage, the more LED units can be connected in series.

The technique shown in Figure 22 is the best of the three, replacing the power converter shown in Figure 21 with each small power converter. Because the structure of the small power converter is relatively simple, and the light groups that can be connected in series are relatively unlimited, the only small disadvantage is that one LED unit is equipped with a small power converter, so the product cost is relatively high.

In the prior art shown in Fig. 20, Fig. 21 and Fig. 22, the existing LED unit adopted comprises a red light-emitting diode (R LED), a green light-emitting diode (G LED), a blue light-emitting diode (B LED) and a control circuit, as shown in Figure 23. The two pins of the existing LED unit are respectively connected to the positive and negative terminals of the DC power supply. The control circuit can be implemented as an integrated circuit (IC, Integrated Circuit), which drives the three primary colors RGB LEDs or operates according to the program set in the original circuit. Color mixing. However, the disadvantage of the existing LED units is that they are implanted with independent control ICs. Therefore, when applied to a light string, the color change of each LED unit after the power is activated is independent and cannot be synchronized. If a controller can be installed in each LED unit and synchronized between each controller, the effect that the light string can express must be quite different from the effect that can only be displayed independently like a starry sky. Therefore, how to take into account the cost and achieve the synchronous effect is the research direction of the industry.

Utility model content

The purpose of the utility model is to provide a synchronous LED light string controller, which uses a controller to receive a synchronous signal to perform synchronous control of the LED light string, so that the LED light string can achieve synchronous display.

The utility model provides a synchronous LED light string controller, comprising: a clock synchronous circuit, receiving a reference signal with a fixed frequency, and generating a system clock according to the reference signal; a counting circuit, counting the system clock, And generate a timing signal; a control logic circuit, receive the timing signal to generate a control signal; and a driving circuit, receive the control signal to drive at least light emitting diode.

The utility model also provides a synchronous LED light string controller, comprising: a level displacement circuit, which receives a reference signal with a fixed frequency, and has a capacitor to filter out the DC value of the reference signal and retain the AC value, And the AC value of the reference signal is consistent with the voltage level of the controller in a voltage bias mode; a clock synchronization circuit is used to synchronize the AC value of the reference signal with the internal frequency of the controller to Outputting a system clock; a counting circuit, counting the system clock, and generating a timing signal; a control logic circuit, receiving the timing signal to generate a control signal; and a driving circuit, receiving the control signal to drive at least a light emitting diode.

The utility model also provides a synchronous LED light string controller, including: an identification circuit, which receives a reference signal with a fixed frequency for level displacement and voltage bias processing, and outputs an identification signal; a displacement temporary storage circuit , receiving and storing the identification signal; an encoding circuit, receiving the data stored in the displacement temporary storage circuit, encoding and outputting the data; a temporary storage circuit, receiving and storing the data stored in the displacement temporary storage circuit complete data; and a driving circuit, receiving the data stored in the temporary storage circuit to drive at least one light emitting diode.

The utility model also provides a synchronous LED light string controller, including: an identification circuit, receiving a reference signal with a fixed frequency, using a capacitor to filter the DC value of the reference signal and retaining the AC value, and using a bias resistor Biasing the filtered reference signal within the operating voltage range of the synchronous LED light string controller, and using two voltage comparators each connected to a reference voltage level to compare with the biased reference signal, and Outputting an identification signal representing that the reference signal is higher than the two reference voltage levels, lower than the two reference voltage levels or between the two reference voltage levels; a displacement temporary storage circuit, receiving And store the identification signal; an encoding circuit, receive the data stored in the displacement temporary storage circuit, encode and output the data; a temporary storage circuit, receive and store the complete data stored in the displacement temporary storage circuit ; and a driving circuit, receiving the data stored in the temporary storage circuit to drive at least one light emitting diode.

The utility model also provides a synchronous LED light string controller, including: an identification circuit, which receives a reference signal with a fixed frequency for level displacement and voltage bias processing, and outputs an identification signal; a displacement temporary storage circuit , receiving and storing the identification signal; an encoding circuit having an output buffer circuit and a bias resistor, the output power of the output buffer circuit is greater than the output power of the bias resistor, and the encoding circuit receives the displacement Temporarily store the data stored in the circuit, and use the output buffer circuit to output the same data, and then use the bias resistor to bias the data output by the output buffer circuit in the operation of the synchronous LED light string controller within the voltage range, and output the biased data; a temporary storage circuit, receiving and storing the complete data stored in the displacement temporary storage circuit; and a driving circuit, receiving the data stored in the temporary storage circuit to Drive at least one LED.

The utility model also provides a synchronous LED light string controller, the synchronous LED light string controller includes: a first control logic circuit coupled to a data input pin; and a second control logic circuit coupled to a A data output pin; wherein, the data input pin and the data output pin indicate data logic H, data logic L and untransmitted data at a predetermined level, and perform data transmission at the same timing.

The utility model also provides a synchronous LED light string controller, the synchronous LED light string controller includes: a first control logic circuit coupled to a data input pin; and a second control logic circuit coupled to a A data output pin; wherein, the signals on the data input pin and the data output pin transmit data logic H, data logic L and clock at a predetermined time interval.

Through the synchronous LED light string controller of the utility model, the synchronous control of the LED light string can be achieved by receiving a reference signal with a fixed frequency by means of a simple structure, and the cost can also be considered.

Description of drawings

FIG. 1A is a block diagram of a tripod LED unit in a preferred embodiment of the present invention;

Fig. 1B is a functional block diagram of the controller of Fig. 1A;

Fig. 2 is a circuit block diagram of a three-pin LED unit connected to a light string;

Fig. 3 is another circuit block diagram of a three-pin LED unit connected to a light string;

Fig. 4 is a circuit block diagram of a three-pin LED unit series connection light string;

Fig. 5 is another circuit block diagram of a three-pin LED unit serially connected to a light string;

Fig. 6 is a circuit block diagram of the level shift circuit of the embodiment shown in Fig. 4 and Fig. 5;

Fig. 7 is a block diagram of a two-legged LED unit in another preferred embodiment of the present invention;

Fig. 8 is a circuit block diagram of a two-pin LED unit serially connected light string;

Fig. 9 is another circuit block diagram of two-legged LED units connected in series to a light string;

Fig. 10 is a circuit block diagram of a two-pin LED unit connected to a light string;

Fig. 11 is a structural diagram of a four-legged LED unit in another preferred embodiment of the present invention;

Fig. 12A is a block diagram of the LED unit shown in Fig. 11;

Fig. 12B is a functional block diagram of the controller of Fig. 12A;

Fig. 13 is a circuit block diagram of a four-pin LED unit connected to a light string;

Fig. 14 is a circuit block diagram of a four-pin LED unit series connection light string;

15A and 15B are schematic diagrams of transmission signals of four-legged LED units;

Fig. 16 is a block diagram of a constant current output circuit of a four-pin LED unit;

17A and 17B are schematic diagrams of series input signals of four-pin LED units;

FIG. 18 is a circuit diagram of input level displacement and decoding of a four-pin LED unit;

Fig. 19 is an output coding circuit diagram of a four-pin LED unit;

FIG. 20 is a circuit block diagram of an existing LED light string;

Fig. 21 is another circuit block diagram of the existing LED light string;

Fig. 22 is another circuit block diagram of the existing LED lamp string;

Fig. 23 is a circuit block diagram of a conventional LED unit.

Description of main component symbols:

10, 40, 50---LED unit

11, 12, 13, 51, 52, 53---LED

14, 54---controller

141---clock synchronization circuit

141a, 543b---output buffer circuit

141b---Input buffer circuit

141c, 15, 541a---capacitance

142---counting circuit

143---Control logic circuit

144---drive circuit

20---Power converter

30---AC power supply

16. 545b---signal amplification circuit

541---identification circuit

541b, 541c, 543c, 543d---resistor

541d, 541e---comparison circuit

541f, 543a---control logic circuit

542---Displacement temporary storage circuit

543---encoding circuit

544---temporary storage circuit

545---drive circuit

545a---Digital/analog conversion circuit

545c---voltage feedback resistor

545d---MOS transistor

546 --- Zener diode

Detailed ways

The utility model is described in detail below in conjunction with accompanying drawing.

The utility model relates to a synchronous LED light string controller, which uses a controller to receive a synchronous signal to achieve synchronous control of the LED light string.

Referring to FIG. 1A , it is a block diagram of a tripod LED unit according to a preferred embodiment of the present invention. The controller 14 of the present utility model is combined in an LED unit 10, and the LED unit 10 further includes a red light emitting diode (R LED) 11, a green light emitting diode (G LED) 12 and a blue light emitting diode (B LED) 13 to provide display effects of different colors. The controller 14 can be an integrated circuit, and the controller 14 can be preset to drive the color change sequence or flashing mode of the light-emitting diodes such as R LED11, G LED12 and B LED13.

According to this preferred embodiment of the present invention, the LED unit 10 has three pins, namely an anode pin V+, a cathode pin V- and a synchronous pin, wherein the anode pin is connected to the cathode pin The pin is used to receive a DC working voltage source supplied to the LED unit 10 , and the synchronization pin is connected to the controller 14 . According to the following different embodiments, the controller 14 outputs a reference signal (or synchronization signal SYNC) with a fixed frequency at the synchronization pin, or receives a reference signal (or synchronization signal SYNC) with a fixed frequency at the synchronization pin ), and the controller 14 controls the R LED 11, the G LED 12 and the B LED 13 to change the color change sequence or flashing mode based on the reference signal (or the synchronous signal SYNC).

Referring to FIG. 1B is a functional block diagram of the controller 14 in FIG. 1A , the controller 14 further includes a clock synchronization circuit 141 , a counting circuit 142 , a control logic circuit 143 and a driving circuit 144 . Wherein, the clock synchronization circuit 141 is used to receive an external synchronization signal, so that the synchronization signal is synchronized with the internal frequency of the controller 14, so as to avoid causing signal errors, and the processed signal is used as the clock source of the internal circuit; the count The circuit 142 counts the signal processed by the clock synchronization circuit 141 to generate the timing required inside the controller 14; the control logic circuit 143 is used to process the timing signal generated by the counting circuit 142 and generate the desired control signal; and the drive circuit 144 is used to add constant current control or current amplification to the control signal generated by the control logic circuit 143 so as to directly drive the light-emitting diodes to make various changes in the light-emitting diodes.

According to this preferred embodiment of the present invention, the controller 14 can also be implemented in a monochrome LED lamp (not shown in the figure), the monochrome LED lamp includes at least one monochrome LED, the monochrome The light-emitting diode is R LED or G LED or B LED, and the single-color light-emitting diode lamp has three pins, which are an anode pin, a cathode pin and a synchronization pin, wherein the anode pin and the cathode pin receive A DC working voltage, and the synchronization pin is connected to the controller 14 . Likewise, in different embodiments, the controller 14 can output a reference signal (or synchronization signal SYNC) with a fixed frequency at the synchronization pin, or receive a reference signal (or synchronization signal SYNC) at the synchronization pin SYNC), and the controller 14 controls the light emitting frequency of the single-color LED based on the reference signal (or synchronous signal SYNC).

Referring to FIG. 2 and FIG. 3 , it is a block diagram of an implementation circuit of the utility model implemented in parallel LED units 10. A synchronous LED light string includes a power converter 20 and a plurality of LED units 10. The power converter 20 connects a The AC power supply 30 rectifies and provides a DC voltage to drive a synchronous light emitting diode string composed of a plurality of LED units 10 connected in parallel.

In a synchronous LED light string, when the LED units 10 are connected in parallel, since the output of the controller 14 of each LED unit 10 is at the same potential, as long as the same synchronization signal SYNC is connected to all controllers 14, each controller 14 can take this synchronous signal SYNC as a reference to generate an action. The synchronous LED light string can use the power converter 20 to transmit a single clock synchronization signal SYNC, so that the controllers 14 of all LED units 10 can receive the same synchronization signal SYNC, achieving the purpose of synchronization in a simple manner.

Referring to FIG. 4 and FIG. 5, it is a circuit block diagram of the utility model implemented in series LED units 10. A synchronous LED light string includes a power converter 20 and a plurality of LED units 10. The power converter 20 converts a The AC power supply 30 rectifies and provides a DC voltage to drive a light string composed of a plurality of LED units 10 connected in series.

In a synchronous LED light string, when the LED units 10 are connected in series, although the manufacturing difficulty is relatively high, the power consumption can be effectively reduced. As shown in FIGS. 4 and 5 , the cathode pins of the LED units 10 of the upper stage are connected to the anode pins of the LED units 10 of the next stage, so the potentials of the LED units 10 of each stage are not equal. Therefore, when the fixed-frequency reference signal (or synchronous signal SYNC) is transmitted to the synchronous pin of the next-level LED unit 10, its controller 14 cannot identify it. The bit-shift method shifts the signal level to a voltage.

Referring to FIG. 6 , it is a circuit block diagram of the level shifting circuit of the embodiment shown in FIG. 4 and FIG. 5 . As shown in the figure, a capacitor 141c is connected between the output buffer circuit 141a and the input buffer circuit 141b of the upper and lower synchronous pins, and the capacitor 141c filters the DC signal and retains the AC signal. In this way, the synchronous pins of each LED unit 10 can obtain the reference signal (or synchronous signal SYNC) from the same frequency source, so as to achieve synchronous actions of synchronous LED light strings.

Referring to FIG. 7 , it is a block diagram of a two-legged LED unit according to another preferred embodiment of the present invention. The controller 14 of the present utility model is combined in an LED unit 10, and the LED unit 10 includes a red light emitting diode (R LED) 11, a green light emitting diode (G LED) 12 and a blue light emitting diode (BLED) 13 , to provide different color display effects. And the LED unit 40 further includes a capacitor 15 and a signal amplifying circuit 16 . The controller 14 can be an integrated circuit, and the controller 14 can be preset to drive the color change sequence or flashing mode of the light-emitting diodes R LED11, G LED12 and B LED13.

According to a preferred embodiment of the present invention, the LED unit 10 has two pins, namely an anode pin V+ and a cathode pin V-, the anode pin and the cathode pin receive a supply to the DC operating voltage of the LED unit 10 . In this embodiment, the LED unit 40 utilizes a carrier signal provided on the DC voltage received by the anode pin V+ to obtain synchronous control by demodulating the carrier signal, so that the controller 14 can A reference signal (or synchronization signal SYNC) with a fixed frequency is output at the synchronization pin, or a reference signal (or synchronization signal SYNC) is received at the synchronization pin, and the controller 14 is based on the reference signal (or synchronization signal SYNC) controls R LED 11, G LED 12 and B LED 13 to change the color change sequence or flashing mode.

Referring to FIG. 8 , FIG. 9 and FIG. 10 are circuit block diagrams of an embodiment in which the LED unit 40 is applied to a synchronous LED light string. In the illustrated embodiment, the power converter 20 rectifies an AC power source 30 to provide a DC voltage to drive a synchronous LED string composed of a plurality of LED units 40 . The reference signal output by the power converter 20 is a carrier signal with a fixed frequency on the DC voltage, and each LED unit 40 uses a capacitor 15 plus a signal amplifier circuit 16 to filter the DC value of the input carrier signal and retain the AC value, so as to The carrier signal is demodulated by the input DC voltage, and the purpose of synchronous control is achieved. In addition to the function of demodulating the carrier signal, the controller 14 of the LED unit 40 can also load the carrier signal on a DC voltage and output it to the next-level LED unit 40, so that the next-level LED The controller 14 of the unit can obtain the same carrier signal for synchronous control.

FIG. 11 is a structure diagram of a four-pin LED unit in another preferred embodiment of the present invention. The LED unit 50 has an anode pin V+, a cathode pin V-, an input pin DI and an output pin. DO. The anode pin and the cathode pin are used to receive a DC voltage, the input pin DI is used to receive a signal, and the output pin DO is used to output a signal.

12A is a block diagram of the LED unit shown in FIG. 11, in this embodiment, the utility model provides a LED unit 50, including a red light-emitting diode (R LED) 51, a green light-emitting diode (GLED) 52, a Blue light-emitting diode (B LED) 53 and a controller 54, this controller 54 can be implemented by an integrated circuit, and this controller 54 drives R LED 51, G LED 52 and B LED 51 according to the signal input by input pin DI The color of the LED 53 changes sequentially or flashes, or the command or data input to the pin DI is output from the output pin DO. Wherein, the signal transmitted by the input pin DI and the output pin DO can be not only a simple clock signal as a synchronous signal, but also a general data signal.

Referring to FIG. 12B is a functional block diagram of the controller of FIG. 12A, the controller 54 further includes an identification circuit 541, a displacement temporary storage circuit 542, an encoding circuit 543, a temporary storage circuit 544, a driving circuit 545 and a set nanodiode 546. Among them, the identification circuit 541 is used to receive the signal of the input pin DI for identification; the displacement temporary storage circuit 542 is used to receive the data transmitted by the identification circuit 541; the temporary storage circuit 544 is used to receive the displacement temporary storage circuit 542 The complete data stored; the drive circuit 545 drives the color change sequence or flashing form of R LED 51, G LED 52 and B LED 53 according to the complete data of the temporary storage circuit 544; and the encoding circuit 543 accepts the recognition circuit The instruction of 541 determines to output the complete data encoding of the shift register circuit 542 to the pin DO. Wherein, the identification circuit 541 identifies whether the data received by the input pin DI is an instruction of the LED unit 50 or re-encodes the data and outputs it to the next-level LED unit 50 through the output pin DO.

Referring to FIG. 13 and FIG. 14 is a circuit block diagram of an embodiment in which the LED unit 50 is applied to a synchronous LED light string. In the circuit block diagram shown in FIG. 13 , the synchronous light-emitting diode lamp string includes a plurality of LED units 50, and the LED units 50 are connected in parallel, and between the upper and lower LED units 50, the LED units 50 of the upper level The output pin DO is simultaneously connected to the input pin DI of the LED unit 50 of the next stage. In this embodiment, the power converter 20 that provides DC power to the synchronous LED light string has data processing capabilities, and can output command data to the input pin DI of the first LED unit 50 through a signal line SL to control synchronous lighting. The color change sequence or flashing pattern of the diode light string.

The power converter 20 can have a built-in microprocessor or data processor and memory to store the form or effect to be displayed by the synchronous LED light string, such as running lights or lotto or chasing effects, and even display specific graphics. When the power converter 20 is connected to the AC power supply 30, the microprocessor or data processor captures the data in the memory, and transmits different signals including data, clock and simultaneous display through the signal line SL in a specific data format.

Referring to FIG. 15A and FIG. 15B are schematic diagrams of signal transmission by the LED unit 50 . The data transmission method of the present invention can be exemplified in the following two ways. One is the method of adding a clock to the voltage level, as shown in FIG. 15A . Before the power converter 20 starts to transmit data, the signal line SL is in a state of no data, which is represented by a voltage level of 1/2VDD. When the power converter 20 starts to transmit data, the digital signal “1” or “0” is used to represent the command data executed by each LED unit 50 , and the action to be executed can be defined in advance. In the process of transmitting data, each bit "1" or "0" must return to the 1/2VDD voltage level at the end and then transmit the next bit, so data and clock can be included at the same time. After the controller 54 in each LED unit 50 receives the data, it is identified and processed by the identification circuit 541, and the data is encoded into the same signal format by the encoding circuit 543 and then transmitted to the next-level LED unit 50 . The total number of LED units 50 is predefined for each synchronous LED light string, so when the microprocessor or data processor needs to change the brightness or color each time, it transmits bytes equal to the total number of LED units 50, each byte will be passed into each LED unit 50 as appropriate.

Then after the data transmission is completed, the output pin DO of the power converter and the output pin DO of the LED unit 50 will stay at the 1/2VDD level. When 1/2VDD appears on pin DO, the data will be locked and displayed. Thus, as long as the content of the memory is replaced, the synchronous LED light string can obtain different flickering or display changing light strings. The synchronous LED light string of this embodiment belongs to the static identification data, and has better Flexible design.

Another kind of data transmission can be as shown in Fig. 15B, which encodes the form of data. The transmission of data and clock is carried out with the numbers "0" and "1" at a predetermined time interval. Similarly, it can be defined that when there is no data for a period of time, if the signal stays at VDD or VSS, when there is no data for a period of time, it means In order to lock the command and change the display, the power converter 20 can successfully use an output pin DO to transmit signals such as data, clock and simultaneous display. The synchronous LED light string in this embodiment requires each LED unit 50 to generate its own clock to identify data.

When the synchronous light-emitting diode light string has a large number of LED units 50, the signal and power lines to be conducted will be very long, and the voltage or current loss will be caused due to the relationship between line resistance, so it is necessary to have the function of outputting constant current so that all LEDs The brightness of the cells is consistent. Referring to FIG. 16 , it is a block diagram of a constant current output circuit of the driving circuit 545 of the four-pin LED unit. When the data latch of the temporary storage circuit 544 is locked, the data is converted into an analog signal by the digital/analog conversion circuit 545a and input to the input terminal of the signal amplification circuit 545b, and the other input terminal of the signal amplification circuit 545b is connected to a voltage Feedback resistor 545c, and the output terminal of the signal amplifying circuit 545b is connected to the gate of a MOS transistor 545d, so that the signal amplifying circuit 545b adjusts the current passing through the MOS transistor 545d through the voltage feedback resistor 545c to provide light-emitting diodes for use in generating the desired brightness.

In the circuit block diagram shown in FIG. 14, because the power level of the controller 54 of each LED unit 50 is different, as shown in FIG. 17A and FIG. 17B, the input signal and the clock level of the upper LED unit 50 are high. Because of the voltage level of the controller 54 itself, it is necessary to add level shift and voltage bias processing to receive the correct signal.

Referring to FIG. 18 , it is the input level displacement and decoding circuit diagram of the identification circuit 541 of the LED unit 50. When the output signal of the controller 54 of the upper-level LED unit 50 is transmitted, its voltage level is positive than that of the LED unit 50. The voltage is high, so a capacitor 541a is used to filter out the DC value of the input signal, and resistors 541b and 541c are used to bias the input signal within the working voltage range of the controller 54 (VSS-2VDD), as shown in Figure 17A and Figure 17B shown. Two voltage comparators 541d, 541e are respectively connected to a reference voltage level VH, VL (as shown in FIG. 15A ) to compare the biased signals. By comparing the biased signal with VH and VL, three states can be obtained: higher than VH and VL, lower than VH and VL, or higher than VL and lower than VH. When the signal is higher than VH and VL, it can be regarded as logic "1", when the signal is lower than VH and VL, it can be regarded as logic "0", when the signal is higher than VL and lower than VH, it can be obtained as 1/2VDD . The clock is defined by the change of the compared signal being logic "1" or logic "0" back to 1/2VDD, so the circuit of the LED unit 50 can identify the high and low levels of the signal and the timing of transmission, and accordingly set the correct The signal is transmitted to the control logic circuit 541f for processing, and then the processed signal is sent to the shift register circuit 542 or the encoding circuit 543 .

Referring to FIG. 19 , it is an output encoding circuit diagram of the encoding circuit 543 of the four-pin LED unit, and the data can be copied and output by using the output encoding circuit. As shown in the figure, the control logic circuit 543a already stores the signals to be transmitted and the timing sequence of the high and low level voltage signals. These signals are passed through a third state output buffer circuit 543b and bias resistors 543c and 543d. Output "1", then the third state output buffer circuit 543b outputs "1". Since the output power of the third state output buffer circuit 543b is designed to be greater than the power of the resistors 543c and 543d, the signal of the output pin DO is output at this time. will be pulled to a high potential "1", if it is desired to output "0", the third state output buffer circuit 543b can output "0", if it is desired to output the third state, then let the third state output buffer circuit 543b have no output, then The signal of the output pin DO will be in the 1/2VDD state due to the bias voltage of the upper and lower resistors 543c, 543d, so that the signal can be reproduced and transmitted to the LED unit 50 of the next stage.

The LED unit 50 further includes a zener diode 546 to limit the operating voltage applied to each controller 54 to be clamped within a fixed range, so as to avoid burning the controller 54 or the LED unit 50 when the voltage is too high. .

After describing the preferred embodiments of the present utility model in detail, those skilled in the art can clearly understand that various changes and changes can be made without departing from the scope and spirit of the following patent application, and the utility model is not limited Implementation of the examples given in the specification.

Claims (9)

1. A synchronous LED light string controller, characterized in that, the synchronous LED light string controller comprises: A clock synchronization circuit, receiving a reference signal with a fixed frequency, and generating a system clock according to the reference signal; a counting circuit, counting the system clock and generating a timing signal; a control logic circuit receiving the timing signal to generate a control signal; and A driving circuit receives the control signal to drive at least the LED. 2. A synchronous LED light string controller, characterized in that, the synchronous LED light string controller comprises: A level shifting circuit receives a reference signal with a fixed frequency and has a capacitor to filter out the DC value of the reference signal and retain the AC value, and compares the AC value of the reference signal with the reference signal in a voltage bias manner. The voltage level of the controller is consistent; A clock synchronization circuit, which synchronizes the AC value of the reference signal with the internal frequency of the controller to output a system clock; a counting circuit, counting the system clock and generating a timing signal; a control logic circuit receiving the timing signal to generate a control signal; and A drive circuit receives the control signal to drive at least one LED. 3. A synchronous LED light string controller, characterized in that, the synchronous LED light string controller comprises: An identification circuit, receiving a reference signal with a fixed frequency for level displacement and voltage bias processing, and outputting an identification signal; a shift register circuit, receiving and storing the identification signal; An encoding circuit, receiving the data stored by the displacement temporary storage circuit, encoding the data and outputting it; a temporary storage circuit for receiving and storing the complete data stored by the displacement temporary storage circuit; and A drive circuit receives data stored in the temporary storage circuit to drive at least one light emitting diode. 4. A synchronous LED light string controller, characterized in that, the synchronous LED light string controller comprises: An identification circuit that receives a reference signal with a fixed frequency, uses a capacitor to filter the DC value of the reference signal and retains the AC value, and uses a bias resistor to bias the filtered reference signal to the synchronous LED lamp within the operating voltage range of the string controller, and each of the two voltage comparators is connected to a reference voltage level to compare with the biased reference signal, and outputs a signal indicating that the reference signal is higher than the two reference voltage levels bit, an identification signal lower than the two reference voltage levels or between the two reference voltage levels; a shift register circuit, receiving and storing the identification signal; An encoding circuit, receiving the data stored by the displacement temporary storage circuit, encoding the data and outputting it; a temporary storage circuit for receiving and storing the complete data stored by the displacement temporary storage circuit; and A drive circuit receives data stored in the temporary storage circuit to drive at least one light emitting diode. 5. A synchronous LED light string controller, characterized in that, the synchronous LED light string controller comprises: An identification circuit, receiving a reference signal with a fixed frequency for level displacement and voltage bias processing, and outputting an identification signal; a shift register circuit, receiving and storing the identification signal; An encoding circuit has an output buffer circuit and a bias resistor, the output power of the output buffer circuit is greater than the output power of the bias resistor, the encoding circuit receives the data stored in the displacement temporary storage circuit, and The same data is output by the output buffer circuit, and then the data output by the output buffer circuit is biased within the operating voltage range of the synchronous LED light string controller by the bias resistor, and the bias voltage is output. Compressed data; a temporary storage circuit for receiving and storing the complete data stored by the displacement temporary storage circuit; and A drive circuit receives data stored in the temporary storage circuit to drive at least one light emitting diode. 6. A synchronous LED light string controller, characterized in that, the synchronous LED light string controller comprises: a first control logic circuit coupled to a data input pin; and a second control logic circuit coupled to a data output pin; Wherein, the data input pin and the data output pin indicate data logic H, data logic L and untransmitted data at a predetermined level, and perform data transmission at the same timing. 7. The synchronous LED light string controller according to claim 6, wherein the signals on the data input pin and the data output pin have a first level, a second level and a third level, The first level indicates data transmission logic H, the second level indicates no data transmission, and the third level indicates data transmission logic L. 8. The synchronous LED light string controller according to claim 7, wherein after outputting the signal with the first level or the third level, the data output pin outputs the signal with the second level Signal. 9. A synchronous LED light string controller, characterized in that the synchronous LED light string controller comprises: a first control logic circuit coupled to a data input pin; and a second control logic circuit coupled to a data output pin; Wherein, the signals on the data input pin and the data output pin transmit data logic H, data logic L and clock at a predetermined time interval.

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