CN2922371Y - Light-emitting diode drive circuit and series-type light-emitting diode light-emitting system - Google Patents

Abstract

A light emitting diode driving circuit and a serial light emitting diode light emitting system are provided, wherein the light emitting diode driving circuit compares a data signal with at least one voltage level by a comparison unit to output a mode selection signal. The buffer unit includes an instruction buffer and a data buffer, and the buffer unit is coupled to the comparison unit and controlled by the mode selection signal to enter an instruction mode or a data transmission mode. The instruction buffer stores working instruction data in an instruction mode, the data buffer stores the light-emitting display data in a data transmission mode, and the buffer unit outputs a secondary data signal when the data buffer is saturated. The driving unit is controlled by the working instruction data and drives the light emitting diode module according to the light emitting display data. The serial LED lighting system comprises a controller connected in series with at least one LED driving circuit. The lighting system can be controlled by the controller to enter a command mode or a data transmission mode so as to meet the requirements of various lighting displays.

Description

Light-emitting diode drive circuit and series-type light-emitting diode light-emitting system

technical field

The utility model relates to a light-emitting diode drive circuit and a series-type light-emitting diode light-emitting system, in particular to a light-emitting diode drive circuit and a series-type light-emitting diode light-emitting system which can work on an alternating voltage source and use a comparator to judge input data signals. system.

Background technique

The discovery of electricity and the invention of lighting made lighting no longer limited to natural light sources. Coupled with the development of the electronics industry, the lighting method using electricity as a light source has become controllable. Therefore, the industry is making extensive use of it. In addition to night lighting, decorative lighting with visual characteristics has also been developed, such as neon lights, laser lights, LEDs, etc., and the biggest feature of these decorative lighting is that it can be patterned. In addition, lighting tubes are arranged around the perimeter of the building, and the light emitted by the tubes can reveal the outline of the building to present a beautiful effect.

In recent years, the industry has often used light-emitting diodes (LEDs), which are energy-saving, long-lasting, and changeable in color, as decorative lights for buildings. A light-emitting diode is a light-emitting device that uses a forward-conducting diode to recombine holes and electrons that conduct carriers, convert potential energy into light energy, and emit a narrow-band close to monochromatic visible light. Light-emitting diodes have low power consumption and good durability, so the component wear rate is relatively low. At present, many kinds of light-emitting diodes with different colors have been manufactured. Therefore, LEDs of different colors can be matched with each other to produce various colors. In addition, light-emitting diodes have high brightness and stable chromaticity light, and the switching speed can be higher than the persistence of vision of the human eye, so they can present continuously changing color images. Therefore, they are widely used as large display panels, dynamic Display elements for video display panels or building decorative lighting.

Please refer to FIG. 1 . FIG. 1 is a schematic circuit block diagram of a known light emitting diode driving circuit. The light emitting diode driving circuit 10 includes a shift register 102 and a driving unit 104. The shift register 102 stores the display data signal according to the clock signal Clock. Data, the driving unit 104 is controlled by the data latch signal Latch, and drives the full-color LED to emit light according to the display data signal Data stored in the shift register 102 . Furthermore, when the data in the shift register 102 is full, the shift register 102 will output the unstored display data signal Data to be sent to the LED driving circuit 10 in the next stage in series.

Please refer to FIG. 2 . FIG. 2 is a schematic block diagram of a conventional series LED lighting system. The lighting system 1 is formed by connecting a plurality of LED driving circuits (10, 12...1n) in series, and these LED driving circuits (10, 12...1n) simultaneously receive a DC power supply V _DD , and are In the lighting system 1 , the LED driving circuit at each stage needs to receive the clock signal Clock, the display data signal Data, the data latch signal Latch or other functional signals So.

In the known lighting system 1 , if other functions are to be added, new transmission lines must be added to meet the new requirements, which will make the transmission lines of the entire lighting system 1 very complicated and increase the difficulty of maintenance. At the same time, each LED driving circuit in the known lighting system 1 uses the same DC power supply V _DD as the power supply, which will cause voltage attenuation in the series LED lighting system, so that the light emission of the rear stage in the lighting system 1 The diode drive circuit cannot be supplied with a stable DC power supply V _DD .

Contents of the invention

In view of this, the utility model provides an LED driving circuit and a series LED lighting system. The LED driving circuit used in the lighting system can work on an alternating voltage source by using a rectifier unit and a power supply unit, thereby avoiding the occurrence of power supply voltage decay. In addition, the light emitting diode driving circuit uses the internal comparator to judge the input data signal, and by increasing the number of internal comparators in the light emitting diode driving circuit, the usage of data transmission lines can be reduced.

The LED drive circuit of the utility model includes a comparison unit, a buffer unit and a drive unit. The comparison unit has at least one voltage level. The comparison unit compares the data signal with the voltage level and outputs a mode selection signal. The data signal is work instruction data or luminous display data. The cache unit includes an instruction cache and a data cache, the cache unit is coupled to the comparison unit, controlled by the mode selection signal, and enters the instruction mode or the data transfer mode according to the clock signal, the instruction cache is used for the instruction The work command data is stored in the mode, the data register stores the light-emitting display data in the data transmission mode, and the buffer unit outputs a secondary data signal when the data register is saturated. The driving unit is coupled to the buffer unit, the driving unit is controlled by the work instruction data, and drives the LED module according to the light-emitting display data.

According to the light-emitting diode drive circuit, it also includes a rectification unit, which receives an alternating voltage source and outputs a direct current voltage.

According to the LED driving circuit, the alternating voltage source is an alternating square wave voltage source.

According to the LED driving circuit, it further includes a voltage supply unit coupled to the rectification unit, and the voltage supply unit outputs the voltage level.

According to the LED driving circuit, it further includes a voltage adjustment unit coupled to the buffer unit, the voltage adjustment unit receives the secondary data signal, and adjusts the voltage level of the secondary data signal and the voltage level of the data signal. The voltage levels are the same.

According to the light-emitting diode driving circuit, the buffer unit further includes a switching unit coupled to the data buffer for receiving the light-emitting display data and outputting the secondary data when the data buffer is saturated Signal.

According to the LED driving circuit, the LED module is a full-color LED.

According to the LED driving circuit, the work instruction data is a latch instruction.

According to the LED driving circuit, the work instruction data is a read-back instruction.

According to the LED driving circuit, the work instruction data is an address instruction.

The serial LED lighting system of the present invention includes a controller and at least one LED driving circuit. The controller outputs a data signal, and the data signal is work instruction data or light display data. The LED driving circuits are coupled in series with the controller, and receive the data signal according to the clock signal. When the serial LED light-emitting system of the present invention is in the command mode, the LED drive circuit simultaneously stores the work instruction data in a parallel data transmission mode, and in the data transmission mode, the LED drive circuit uses The serial data transmission method transmits the secondary data signals sequentially.

The light-emitting diode drive circuit includes: a comparison unit with at least one voltage level, the comparison unit compares the data signal with the voltage level, and outputs a mode selection signal; a cache unit includes an instruction register and a data A register, the buffer unit is coupled to the comparison unit, controlled by the mode selection signal to enter the command mode or the data transfer mode, the command register stores the work command data in the command mode, and the data register is in the command mode The light-emitting display data is stored in the data transmission mode, and the buffer unit outputs a secondary data signal when the data buffer is saturated; and a driving unit is coupled to the buffer unit, and the driving unit is controlled by the work instruction data, And drive the LED module.

According to the series-type LED lighting system, the LED driving circuit further includes a rectification unit for receiving an AC voltage source and outputting a DC voltage.

According to the series LED lighting system, the alternating voltage source is an alternating square wave voltage source.

According to the series-type LED lighting system, the LED driving circuit further includes a voltage supply unit coupled to the rectification unit for outputting the voltage level.

According to the series-type LED lighting system, the LED driving circuit further includes a voltage adjustment unit coupled to the buffer unit, the voltage adjustment unit receives the secondary data signal, and adjusts the voltage of the secondary data signal The level is the same as the voltage level of the data signal.

According to the series-type light-emitting diode lighting system, the buffer unit further includes a switching unit, the switching unit is coupled to the data buffer, and when the data buffer is saturated, the switching unit displays data according to the light to output The secondary data signal is sent to the LED driving circuit of the next stage.

According to the series LED lighting system, the LED module is a full-color LED.

According to the tandem LED lighting system, the work instruction data is a latch instruction.

According to the tandem LED lighting system, the work instruction data is a readback instruction.

According to the tandem LED lighting system, the work instruction data is an address instruction.

To sum up, the utility model provides an LED driving circuit and a series LED lighting system. The LED driving circuit used in the lighting system can work on an alternating voltage source by using a rectifier unit and a power supply unit, thereby avoiding the occurrence of attenuation of the supply voltage. In addition, the light-emitting diode driving circuit uses the internal comparator to judge the input data signal. By increasing the number of internal comparators in the light-emitting diode driving circuit, the light-emitting system can cope with new functions without adding transmission lines. At the same time, the lighting system of the present invention can be controlled by the controller to enter command mode or data transmission mode, so as to meet various requirements of lighting display.

The above summary and the following detailed description are exemplary, and are intended to further illustrate the scope of the claims of the present invention. Other purposes and advantages of the present utility model will be described in the subsequent description and accompanying drawings.

Description of drawings

FIG. 1 is a schematic circuit block diagram of a known LED drive circuit;

Fig. 2 is a block schematic diagram of a known tandem LED lighting system;

Fig. 3 is the schematic diagram of the circuit block of the light-emitting diode driving circuit of the present invention;

Figure 4 is a schematic diagram of the internal block of the buffer unit of the present invention; and

Fig. 5 is a schematic block diagram of the utility model series LED lighting system.

Wherein, the reference signs are explained as follows:

known:

1 lighting system

10. 12...1n LED drive circuit

102 displacement register

104 drive unit

The utility model:

2 Lighting system

20, 22...2n LED drive circuit

202 Comparing units

204 cache units

2040 Instruction Register

2042 data buffer

2044 switching unit

206 drive unit

207 Rectifier unit

208 voltage supply unit

209 Voltage follower unit

Detailed ways

Please refer to FIG. 3 , which is a circuit block diagram of the LED driving circuit of the present invention. The LED driving circuit 20 receives the data signal Data according to the clock signal Clock, and includes a comparison unit 202 , a buffer unit 204 and a driving unit 206 .

The comparison unit 202 has at least one voltage level. The comparison unit 202 compares the data signal Data with these voltage levels, and outputs a mode selection signal Sc. The data signal Data can be work command data or light display data. In conjunction with FIG. 4 , it is a schematic diagram of the internal block of the cache unit of the present invention. The cache unit 204 includes an instruction cache 2040 and a data cache 2042. The cache unit 204 is coupled to the comparison unit 202, controlled by the mode selection signal Sc, and enters the command mode or data transmission according to the clock signal Clock. model. The working instruction can be a data latch instruction (Latch Instruction), a read back instruction (Read Back Instruction) or an address instruction (Address Instruction).

The command register 2040 stores the work command data in the command mode, the data register 2042 stores the light-emitting display data in the data transmission mode, and the buffer unit 204 outputs secondary data when the data register 2042 is saturated Signal Data 1. The driving unit 206 is coupled to the buffer unit 204. The driving unit 206 is controlled by the work instruction data, and drives the LED module (not shown) according to the light display data. The LED module is a full-color LED.

Cooperating with FIG. 4 , referring to FIG. 3 again, the light-emitting diode drive circuit 20 of the present invention uses the comparison unit 202 to receive the data signal Data. When the data signal Data is work instruction data, the level of the data signal Data will be greater than that of the comparison unit. 202 voltage level, and the light emitting diode driving circuit 20 will enter the command mode to execute related work commands such as data latch command, read back command or address command. When the LED driving circuit 20 executes the data latch command, the internal driving unit 206 is controlled by the data latch command to drive the full-color LED according to the light display data stored in the data register 2042 . When the LED driving circuit 20 executes the read-back command, the light-emitting display data stored in the data register 2042 will be read by the controller (not shown). When the LED driving circuit 20 executes the address command, it can set its own address and be controlled by the controller.

Moreover, when the data signal Data is light-emitting display data, the level of the data signal Data will be lower than the voltage level of the comparison unit 202, and the LED driving circuit 20 will enter the data transmission mode to perform data storage and send.

Referring again to FIG. 3 , the LED driving circuit 20 further includes a rectification unit 207 . The rectification unit 207 receives an alternating voltage source AC and outputs a DC voltage Vc. The alternating voltage source AC is an alternating square wave voltage source. Meanwhile, the LED driving circuit 20 further includes a voltage supply unit 208 coupled to the rectification unit 207, and the voltage supply unit 208 is used to output these voltage levels according to the DC voltage Vc. The LED drive circuit 20 also includes a voltage follower unit 209 coupled to the buffer unit 204, the voltage follower unit 209 receives the secondary data signal Data 1, and adjusts the voltage level of the secondary data signal Data 1 and the data The voltage levels of the signal Data are the same.

Referring back to FIG. 4, the buffer unit 204 further includes a switching unit 2044, which is coupled to the data buffer 2042, receives the light display data, and outputs the secondary data signal when the data buffer 2042 is saturated. Data 1 to the LED driving circuit of the next stage (not marked).

Please refer to FIG. 5 , which is a schematic block diagram of the tandem LED lighting system of the present invention. The LED lighting system 2 of the present invention is composed of a controller 21 connected to at least one LED driving circuit (20, 22, 2n), and the controller 21 outputs a data signal Data, which is work instruction data or light-emitting display data . The LED driving circuits (20, 22, 2n) are coupled in series with the controller 21, and receive the data signal Data according to the clock signal Clock. At the same time, when the LED lighting system 2 is in the instruction mode, these LED driving circuits (20, 22, 2n) simultaneously store the work instruction data in a parallel data transmission mode, and in the data transmission mode, these LED driving circuits (20 , 22, 2n) sequentially transmit the secondary data signal Data 1 in a serial data transmission manner.

Referring again to FIG. 5 , in the LED lighting system 2 of the present invention, these LED driving circuits ( 20 , 22 , 2n ) are all controlled by the work command data output by the controller 21 and enter the command mode at the same time. Moreover, these LED driving circuits ( 20 , 22 , 2n ) are also controlled by the light-emitting display data output by the controller 21 , and enter into the data transmission mode sequentially. In the data transmission mode, the first-stage LED driving circuit 20 will first store the light-emitting display data. When the data in the data register 2042 in the first-stage LED driving circuit 20 is saturated, The switching unit 2044 will act to transmit the unstored light-emitting display data to the second-level LED driving circuit 22 as the secondary data signal Data1. The operation principle of the second-stage LED driving circuit 22 is the same as that of the first-stage LED driving circuit 20 . In this way, the LED lighting system 2 sequentially transmits the secondary data signal Data 1 in a serial data transmission mode in the data transmission mode to complete the data transmission.

To sum up, the utility model provides an LED driving circuit and a series LED lighting system. The LED driving circuit used in the lighting system can work on an alternating voltage source by using a rectifier unit and a power supply unit, thereby avoiding the occurrence of attenuation of the supply voltage. In addition, the light-emitting diode driving circuit uses the internal comparator to judge the input data signal. By increasing the number of internal comparators in the light-emitting diode driving circuit, the light-emitting system can cope with new functions without adding transmission lines. At the same time, the lighting system of the present invention can be controlled by the controller to enter command mode or data transmission mode, so as to meet various requirements of lighting display.

However, the above description is only the detailed description and accompanying drawings of one of the best specific embodiments of the present invention, any changes or modifications that can be easily conceived by those skilled in the art within the scope of the present invention are all possible. Covered in the scope of protection intended by the claims of the present utility model below.

Claims (20)

1. A light-emitting diode drive circuit for receiving data signals, characterized in that it includes: A comparison unit having at least one voltage level, the comparison unit compares the data signal with the voltage level, and outputs a mode selection signal, the data signal is work instruction data or light-emitting display data; The cache unit includes an instruction register and a data register, the cache unit is coupled to the comparison unit, and is controlled by the mode selection signal to enter the command mode or the data transfer mode, and the command register is stored in the command mode For the work command data, the data register stores the light-emitting display data in the data transmission mode, and the buffer unit outputs a secondary data signal when the data register is saturated; and The driving unit is coupled to the buffer unit, and the driving unit is controlled by the work instruction data to drive the LED module. 2. The light emitting diode driving circuit according to claim 1, further comprising a rectification unit, which receives an alternating voltage source and outputs a direct current voltage. 3. The LED driving circuit according to claim 2, wherein the alternating voltage source is an alternating square wave voltage source. 4. The LED driving circuit according to claim 2, further comprising a voltage supply unit coupled to the rectification unit, and the voltage supply unit outputs the voltage level. 5. The LED driving circuit according to claim 4, further comprising a voltage follower unit coupled to the buffer unit, the voltage follower unit receives the secondary data signal, and adjusts the secondary data signal The voltage level of is the same as the voltage level of the data signal. 6. The light-emitting diode driving circuit according to claim 5, wherein the buffer unit further includes a switching unit, the switching unit is coupled to the data buffer for receiving the light-emitting display data, and in the data The secondary data signal is output when the buffer is saturated. 7. The LED driving circuit according to claim 1, wherein the LED module is a full-color LED. 8. The light emitting diode driving circuit according to claim 1, wherein the work command data is a latch command. 9. The LED driving circuit according to claim 1, wherein the work instruction data is a read-back instruction. 10. The LED driving circuit according to claim 1, wherein the work command data is an address command. 11. A series light-emitting diode lighting system, characterized in that it includes: The controller outputs a data signal, which is work instruction data or luminous display data; At least one LED driving circuit is coupled in series with the controller, and the LED driving circuit includes: a comparison unit having at least one voltage level, the comparison unit compares the data signal with the voltage level, and outputs a mode selection signal; The cache unit includes an instruction register and a data register, the cache unit is coupled to the comparison unit, and is controlled by the mode selection signal to enter the command mode or the data transfer mode, and the command register is stored in the command mode For the work command data, the data register stores the light-emitting display data in the data transmission mode, and the buffer unit outputs a secondary data signal when the data register is saturated; and The driving unit is coupled to the buffer unit, the driving unit is controlled by the work instruction data, and drives the LED module. 12. The series LED lighting system according to claim 11, wherein the LED driving circuit further comprises a rectification unit for receiving an AC voltage source and outputting a DC voltage. 13. The series LED lighting system according to claim 12, wherein the alternating voltage source is an alternating square wave voltage source. 14. The LED lighting system in series according to claim 12, wherein the LED driving circuit further comprises a voltage supply unit coupled to the rectification unit for outputting the voltage level. 15. The series-type LED lighting system according to claim 14, wherein the LED driving circuit further comprises a voltage follower unit coupled to the buffer unit, the voltage follower unit receives the secondary data signal, And adjust the voltage level of the secondary data signal to be the same as the voltage level of the data signal. 16. The series-type LED lighting system according to claim 15, wherein the buffer unit further includes a switching unit, the switching unit is coupled to the data buffer, and when the data buffer is saturated, the switching unit The unit outputs the secondary data signal to the LED driving circuit of the next stage according to the light-emitting display data. 17. The tandem LED lighting system according to claim 11, wherein the LED module is a full-color LED. 18. The tandem LED lighting system according to claim 11, wherein the work command data is a latch command. 19. The tandem LED lighting system according to claim 11, wherein the work instruction data is a readback instruction. 20. The tandem LED lighting system according to claim 11, wherein the work command data is an address command.

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