LED drive control circuit

Abstract

The invention discloses an LED drive control circuit, which comprises a sensor, a dimmer, a detection control circuit, a control module, and a drive circuit. The output end of the sensor is connected to a first input end of the detection control circuit, the output end of the dimmer is connected to a second input end of the detection control circuit, the output end of the detection control circuit is connected to an input end of the control module, and the output end of the control module is connected to an input end of the drive circuit. The advantages are that the circuit structure is simple and the cost is low.

Description

Technical Field

[0001] The invention relates to an LED lighting product, and in particular to an LED drive control circuit. Background Art

[0002] Traditional LED lighting products are generally turned on and off and the brightness is adjusted by wall switches and dimmers. With the integration of LED lighting products, LED lighting products that can be adjusted by dimmers and switched on and off by sensors have appeared on the market. The LED drive control circuit of such LED lighting products is as follows Figure 1 As shown, the output end of the sensor 10 is connected to the first input end of the control module 12 through the first signal conversion circuit 11, the output end of the dimmer 13 is connected to the second input end of the control module 12 through the second signal conversion circuit 14, the output end of the control module 12 is connected to the input end of the drive circuit 15, and the control module 12 controls the drive circuit 15 to adjust the LED lamp according to different signals input from the sensor 10 or the dimmer 13. This LED drive control circuit has a complex circuit structure and high cost because the sensor 10 and the dimmer 13 need to transmit signals through different signal conversion circuits respectively. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide an LED drive control circuit with a simple circuit structure and low cost.

[0004] The technical solution adopted by the present invention to solve the above technical problems is: an LED drive control circuit, including a sensor, a dimmer, a control module, and a drive circuit, characterized in that: it also includes a detection control circuit for detecting the output signal of the sensor and the output signal of the dimmer to output different voltages, the output end of the sensor is connected to the first input end of the detection control circuit, the output end of the dimmer is connected to the second input end of the detection control circuit, the output end of the detection control circuit is connected to the input end of the control module, and the output end of the control module is connected to the input end of the drive circuit.

[0005] The LED driving control circuit also includes a power supply circuit, which is connected to the detection control circuit and the control module respectively to supply power to the detection control circuit and the control module.

[0006] The detection control circuit includes a first TVS electrostatic protection diode, a second TVS electrostatic protection diode, a first diode, a first resistor, a second resistor, a third resistor, a fourth resistor and a capacitor. The cathode of the first TVS electrostatic protection diode is connected to one end of the second resistor, and their common connection end serves as the second input end of the detection control circuit. The cathode of the second TVS electrostatic protection diode, one end of the first resistor, and the cathode of the first diode are connected, and their common connection end serves as the first input end of the detection control circuit. The other end of the second resistor, the anode of the first diode, one end of the third resistor, one end of the capacitor, and one end of the fourth resistor are connected, and their common connection end serves as the output end of the detection control circuit. The anode of the first TVS electrostatic protection diode, the anode of the second TVS electrostatic protection diode, the other end of the first resistor, the other end of the third resistor, and the other end of the capacitor are all grounded, and the other end of the fourth resistor is connected to the power supply circuit to access a 3.3V voltage.

[0007] When someone passes by, the sensor outputs a high level, and the detection control circuit outputs a voltage of vz. When no one passes by, the sensor outputs a low level or the output of the sensor presents a high impedance. When the sensor outputs a low level, the voltage output by the detection control circuit is vz, vz≈0.2V, which is the voltage drop value on the first diode; when the output of the sensor presents a high impedance, the voltage output by the detection control circuit is vz, which is calculated by get;

[0008] When the dimmer is dimming, the voltage output by the detection control circuit is vz, which is calculated by get;

[0009] In the above, va represents the voltage output by the power supply circuit, va=3.3V, vm represents the voltage output by the sensor, vd represents the voltage output by the dimmer during the dimming process, R1 represents the resistance value of the first resistor, R2 represents the resistance value of the second resistor, R3 represents the resistance value of the third resistor, and R4 represents the resistance value of the fourth resistor.

[0010] The working principle of the sensor is: when someone passes by, the sensor outputs a high level to light up the LED light; when no one is around, the sensor outputs a low level or presents a high impedance to turn off the LED light. The control module outputs different PWM signals to the drive circuit according to the different vz values ​​received to make the LED light switch or dim.

[0011] The sensor is an infrared sensor or a microwave sensor.

[0012] The dimmer is a 0-10V dimmer.

[0013] The control module is a single chip microcomputer (MCU), and a general single chip microcomputer can be selected, which has basic functions.

[0014] The driving circuit adopts a FLYBACK topology structure, which supports the input of a 0-10V dimming control signal.

[0015] The power supply circuit adopts a three-terminal voltage regulator circuit (LDO), and the three-terminal voltage regulator circuit outputs a 3.3V voltage to the detection control circuit and the control module.

[0016] Compared with the prior art, the advantages of the present invention are:

[0017] The output signals of the sensor and dimmer in the LED drive control circuit enter the control module after passing through the detection control circuit. The control module outputs PWM signals according to the different signals received to enable the drive circuit to control the switching and dimming status of the LED lamp. Since only one detection control circuit is used, the circuit structure is simplified and the cost is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the composition of an existing LED drive control circuit;

[0019] Figure 2 It is a schematic diagram of the composition of the LED drive control circuit of the present invention;

[0020] Figure 3 It is a circuit diagram of the detection control circuit in the LED drive control circuit of the present invention. DETAILED DESCRIPTION

[0021] The present invention is further described in detail below with reference to the accompanying drawings.

[0022] The present invention proposes an LED drive control circuit, such as Figure 2As shown, it includes a sensor 20, a dimmer 21, a detection control circuit 22, a control module 23, a drive circuit 24, and a power supply circuit 25. The output end of the sensor 20 is connected to the first input end of the detection control circuit 22, and the output end of the dimmer 21 is connected to the second input end of the detection control circuit 22. The detection control circuit 22 is used to detect the output signal of the sensor 20 and the output signal of the dimmer 21 to output different voltages. The output end of the detection control circuit 22 is connected to the input end of the control module 23, and the output end of the control module 23 is connected to the input end of the drive circuit 24; the sensor 20 outputs a high level or a low level or presents a high impedance, and the dimmer 21 dims. Under the premise of the output of the sensor 20 and the dimming of the dimmer 21, the detection control circuit 22 outputs different voltages. The control module 23 outputs a PWM signal according to the different voltages output by the detection control circuit 22 to make the drive circuit 24 work, and control the on or off and dimming of the LED lamp. The power supply circuit 25 is connected to the detection control circuit 22 and the control module 23 respectively to supply power to the detection control circuit 22 and the control module 23.

[0023] In this embodiment, the detection control circuit 22 is as follows Figure 3 As shown, it includes a first TVS (Transient Voltage Suppressor) electrostatic protection diode ZD1, a second TVS electrostatic protection diode ZD2, a first diode D1, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4 and a capacitor C1, the cathode of the first TVS electrostatic protection diode ZD1 is connected to one end of the second resistor R2, and the common connection end thereof serves as the second input end (marked as DIM in the figure) of the detection control circuit 22, the cathode of the second TVS electrostatic protection diode ZD2, one end of the first resistor R1, and the cathode of the first diode D1 are connected, and the common connection end thereof serves as the detection control circuit 22. The first input end of the control circuit 22 (marked as MOTION in the figure), the other end of the second resistor R2, the anode of the first diode D1, one end of the third resistor R3, one end of the capacitor C1, and one end of the fourth resistor R4 are connected, and their common connection end serves as the output end of the detection control circuit 22 (marked as INT in the figure), the anode of the first TVS electrostatic protection diode ZD1, the anode of the second TVS electrostatic protection diode ZD2, the other end of the first resistor R1, the other end of the third resistor R3, and the other end of the capacitor C1 are all grounded GND, and the other end of the fourth resistor R4 is connected to the power supply circuit 25 to access a 3.3V voltage.

[0024] When someone passes by, the sensor 20 outputs a high level, and the voltage output by the detection control circuit 22 is vz. When no one passes by, the sensor 20 outputs a low level or the output of the sensor 20 presents a high impedance. When the sensor 20 outputs a low level, the voltage output by the detection control circuit 22 is vz, vz≈0.2V, which is the voltage drop value on the first diode D1; when the output of the sensor 20 presents a high impedance, the voltage output by the detection control circuit 22 is vz, which is calculated by When the dimmer 21 is dimming, the voltage output by the detection control circuit 22 is vz, which is calculated by Obtained; As mentioned above, va represents the voltage output by the power supply circuit 25, va=3.3V, vm represents the voltage output by the sensor 20, vd represents the voltage output by the dimmer 21 during the dimming process, vd is known, R1 represents the resistance value of the first resistor R1, R2 represents the resistance value of the second resistor R2, R3 represents the resistance value of the third resistor R3, and R4 represents the resistance value of the fourth resistor R4. The working principle of the sensor 20 is: when someone passes by, the sensor 20 outputs a high level to light up the LED light; when no one is around, the sensor 20 outputs a low level or presents a high impedance to turn off the LED light. The control module 23 outputs different PWM signals to the drive circuit 24 according to the different vz values ​​received to make the LED light present a switch or dimming state.

[0025] In this embodiment, the sensor 20 adopts an infrared sensor or a microwave sensor; the dimmer 21 adopts a 0-10V dimmer; the control module 23 is a single-chip microcomputer (MCU), and a general single-chip microcomputer with basic functions can be selected, and the single-chip microcomputer processes signals using existing technical means; the drive circuit 24 adopts a FLYBACK topology structure, which supports the input of 0-10V dimming control signals; the power supply circuit 25 adopts a three-terminal voltage regulator circuit (LDO), and the three-terminal voltage regulator circuit outputs a 3.3V voltage to the detection control circuit 22 and the control module 23.

Claims

1. An LED drive control circuit, comprising a sensor, a dimmer, a control module, and a drive circuit, characterized in that: It also includes a detection control circuit for detecting the output signal of the sensor and the output signal of the dimmer to output different voltages, the output end of the sensor is connected to the first input end of the detection control circuit, the output end of the dimmer is connected to the second input end of the detection control circuit, the output end of the detection control circuit is connected to the input end of the control module, and the output end of the control module is connected to the input end of the drive circuit; The detection control circuit includes a first TVS electrostatic protection diode, a second TVS electrostatic protection diode, a first diode, a first resistor, a second resistor, a third resistor, a fourth resistor and a capacitor. The cathode of the first TVS electrostatic protection diode is connected to one end of the second resistor, and their common connection end serves as the second input end of the detection control circuit. The cathode of the second TVS electrostatic protection diode, one end of the first resistor, and the cathode of the first diode are connected, and their common connection end serves as the first input end of the detection control circuit. The other end of the second resistor, the anode of the first diode, one end of the third resistor, one end of the capacitor, and one end of the fourth resistor are connected, and their common connection end serves as the output end of the detection control circuit. The anode of the first TVS electrostatic protection diode, the anode of the second TVS electrostatic protection diode, the other end of the first resistor, the other end of the third resistor, and the other end of the capacitor are all grounded, and the other end of the fourth resistor is connected to the power supply voltage.

2. The LED drive control circuit according to claim 1, characterized in that: The LED driving control circuit also includes a power supply circuit, which is connected to the detection control circuit and the control module respectively to supply power to the detection control circuit and the control module.

3. The LED drive control circuit according to claim 2, characterized in that: The other end of the fourth resistor is connected to the power supply circuit and receives a 3.3V voltage.

4. The LED drive control circuit according to claim 3, characterized in that: When someone passes by, the sensor outputs a high level, and the detection control circuit outputs a voltage of vz. When no one passes by, the sensor outputs a low level or the output of the sensor presents a high impedance. When the sensor outputs a low level, the voltage output by the detection control circuit is vz, vz≈0.2V, which is the voltage drop value on the first diode; when the output of the sensor presents a high impedance, the voltage output by the detection control circuit is vz, which is calculated by get; When the dimmer is dimming, the voltage output by the detection control circuit is vz, which is calculated by get; In the above, va represents the voltage output by the power supply circuit, va=3.3V, vm represents the voltage output by the sensor, vd represents the voltage output by the dimmer during the dimming process, R1 represents the resistance value of the first resistor, R2 represents the resistance value of the second resistor, R3 represents the resistance value of the third resistor, and R4 represents the resistance value of the fourth resistor.

5. An LED drive control circuit according to any one of claims 1 to 4, characterized in that: The sensor is an infrared sensor or a microwave sensor.

6. An LED drive control circuit according to any one of claims 1 to 4, characterized in that: The dimmer is a 0-10V dimmer.

7. An LED drive control circuit according to any one of claims 1 to 4, characterized in that: The control module is a single chip microcomputer.

8. The LED drive control circuit according to claim 6, characterized in that: The driving circuit adopts a FLYBACK topology structure.

9. An LED drive control circuit according to claim 2, 3 or 4, characterized in that: The power supply circuit adopts a three-terminal voltage stabilizing circuit.

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