LED intelligent drive control circuit

Abstract

This utility model discloses an intelligent LED driving control circuit, relating to the LED field. The intelligent LED driving control circuit includes: a power supply module for supplying 220V AC power; a step-down rectifier and filter module for converting the 220V AC power into DC power; an LED driving module for adjusting the brightness of the LED device based on an input PWM signal; and a brightness control module for changing the duty cycle of the output PWM signal based on ambient brightness or manual adjustment. The power supply module is connected to the step-down rectifier and filter module, which is connected to the LED driving module, and the brightness control module is connected to the LED driving module. The beneficial effect of this utility model is that, through the brightness control module, the brightness of the LED devices (LEDs D1 and D2) in the LED driving module can be adjusted based on ambient brightness or manual control to meet the user's needs.

Description

Technical Field

[0001] This utility model relates to the field of LEDs, specifically an LED intelligent drive control circuit. Background Technology

[0002] An LED driver is a power regulation electronic device mainly used to drive LED devices to emit light or to ensure the normal operation of LED module components. Currently, adjusting the brightness of LED devices using existing LED drivers often requires manual adjustment by the user, which is cumbersome and needs improvement. Utility Model Content

[0003] The purpose of this invention is to provide an intelligent LED driving control circuit to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution:

[0005] An LED intelligent driving control circuit includes:

[0006] The power supply module is used to supply 220V AC power;

[0007] A step-down rectifier and filter module is used to convert 220V AC power into DC power;

[0008] LED driver module, used to adjust the brightness of LED devices based on input PWM signal;

[0009] The brightness control module is used to change the duty cycle of the output PWM signal based on ambient brightness or manual adjustment.

[0010] The power supply module is connected to the step-down rectifier and filter module, the step-down rectifier and filter module is connected to the LED driver module, and the brightness control module is connected to the LED driver module.

[0011] As a further embodiment of this utility model: the step-down rectifier filter module includes a transformer W, diodes D1, D2, D3, and D4, a capacitor C1, an inductor L1, a resistor R1, and a resistor R2. The input terminal of the transformer W is connected to the power supply module. One end of the output terminal of the transformer W is connected to the positive terminal of diode D1 and the negative terminal of diode D3. The other end of the output terminal of the transformer W is connected to the positive terminal of diode D2 and the negative terminal of diode D4. The positive terminal of diode D3 is grounded, and the positive terminal of diode D4 is grounded. The negative terminal of diode D1 is connected to the negative terminal of diode D2, one end of capacitor C1, and one end of inductor L1. The other end of capacitor C1 is grounded. The other end of inductor L1 is connected to one end of resistor R1 and one end of resistor R2. The other end of resistor R1 is grounded, and the other end of resistor R2 is connected to the LED driver module.

[0012] As a further embodiment of this utility model: the LED driver module includes chip U1, resistor R3, resistor R4, LED D1, and LED D2. Chip U1 is model NUD4301. Pin 1 of chip U1 is connected to pin 9 of chip U1, the step-down rectifier filter module, the positive terminal of LED D1, and the positive terminal of LED D2. Pin 2 of chip U1 is connected to the brightness control module. Pin 4 of chip U1 is grounded. Pin 5 of chip U1 is grounded through resistor R4. Pin 8 of chip U1 is grounded through resistor R3. Pin 6 of chip U1 is connected to the negative terminal of LED D2. Pin 7 of chip U1 is connected to the negative terminal of LED D1.

[0013] As a further improvement of this utility model: the brightness control module includes:

[0014] The capacitor charging unit is used to charge the capacitor when the voltage at the non-inverting input of the amplifier is higher than the voltage at the inverting input.

[0015] The capacitor discharge unit is used to discharge the capacitor when the voltage at the inverting input of the amplifier is higher than the voltage at the non-inverting input; the resistance value in the discharge circuit can be changed.

[0016] The capacitor charging unit is connected to the capacitor discharge voltage.

[0017] As a further embodiment of this utility model: the capacitor charging unit includes a capacitor C2, an amplifier U2, a resistor R6, a resistor R7, a resistor R5, and a diode D4. The inverting terminal of the amplifier U2 is connected to one end of the capacitor C2 and one end of the resistor R5. The non-inverting terminal of the amplifier U2 is connected to one end of the resistor R6 and one end of the resistor R7. The other end of the capacitor C2 is grounded, the other end of the resistor R7 is grounded, the other end of the resistor R6 is connected to the positive terminal of the diode D4 and the output terminal of the amplifier U2, and the negative terminal of the diode D4 is connected to the other end of the resistor R5.

[0018] As a further embodiment of this utility model: the capacitor discharge unit includes a switch S1, a potentiometer RP1, a photoresistor RW, and a diode D3. The first end of the switch S1 is connected to the inverting input of the amplifier U2, the second end of the switch S1 is connected to one end of the photoresistor RW, the third end of the switch S1 is connected to one end of the potentiometer RP1, the other end of the potentiometer RP1 is connected to the other end of the photoresistor RW and the positive terminal of the diode D3, and the negative terminal of the diode D3 is connected to the output terminal of the amplifier U2.

[0019] Compared with the prior art, the beneficial effects of this utility model are: this utility model adjusts the brightness of the LED devices (light-emitting diodes D1 and D2) in the LED driver module by setting a brightness control module based on ambient brightness or manual control, so as to meet the user's needs. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of an LED intelligent driver control circuit.

[0021] Figure 2 This is a circuit diagram of the step-down rectifier filter module and the LED driver module.

[0022] Figure 3 This is the circuit diagram for the brightness control module. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0024] Please see Figure 1 An LED intelligent driving control circuit includes:

[0025] The power supply module is used to supply 220V AC power;

[0026] A step-down rectifier and filter module is used to convert 220V AC power into DC power;

[0027] LED driver module, used to adjust the brightness of LED devices based on input PWM signal;

[0028] The brightness control module is used to change the duty cycle of the output PWM signal based on ambient brightness or manual adjustment.

[0029] The power supply module is connected to the step-down rectifier and filter module, the step-down rectifier and filter module is connected to the LED driver module, and the brightness control module is connected to the LED driver module.

[0030] In this embodiment: Please refer to Figure 2 The step-down rectifier and filter module includes a transformer W, diodes D1, D2, D3, and D4, a capacitor C1, an inductor L1, and resistors R1 and R2. The input terminal of transformer W is connected to the power supply module. One output terminal of transformer W is connected to the positive terminal of diode D1 and the negative terminal of diode D3. The other output terminal of transformer W is connected to the positive terminal of diode D2 and the negative terminal of diode D4. The positive terminal of diode D3 is grounded, and the positive terminal of diode D4 is grounded. The negative terminal of diode D1 is connected to the negative terminal of diode D2, one end of capacitor C1, and one end of inductor L1. The other end of capacitor C1 is grounded. The other end of inductor L1 is connected to one end of resistor R1 and one end of resistor R2. The other end of resistor R1 is grounded. The other end of resistor R2 is connected to the LED driver module.

[0031] The input AC power is stepped down by transformer W, then converted to DC by a bridge rectifier circuit consisting of diodes D1, D2, D3, and D4. It is then filtered into stable DC power by a filter circuit consisting of capacitor C1, inductor L1, and resistor R1. Finally, it is output to the subsequent circuit after being current-limited by resistor R2.

[0032] In this embodiment: Please refer to Figure 2 The LED driver module includes chip U1, resistors R3 and R4, LED D1, and LED D2. Chip U1 is model NUD4301. Pin 1 of chip U1 is connected to pin 9 of chip U1, the step-down rectifier filter module, the positive terminal of LED D1, and the positive terminal of LED D2. Pin 2 of chip U1 is connected to the brightness control module. Pin 4 of chip U1 is grounded. Pin 5 of chip U1 is grounded through resistor R4. Pin 8 of chip U1 is grounded through resistor R3. Pin 6 of chip U1 is connected to the negative terminal of LED D2. Pin 7 of chip U1 is connected to the negative terminal of LED D1.

[0033] The brightness of LEDs D1 and D2 is adjusted by changing the voltage of pins 6 and 7 of chip U1 based on the duty cycle of the input PWM signal.

[0034] In this embodiment: Please refer to Figure 3 The brightness control module includes:

[0035] The capacitor charging unit is used to charge the capacitor when the voltage at the non-inverting input of the amplifier is higher than the voltage at the inverting input.

[0036] The capacitor discharge unit is used to discharge the capacitor when the voltage at the inverting input of the amplifier is higher than the voltage at the non-inverting input; the resistance value in the discharge circuit can be changed.

[0037] The capacitor charging unit is connected to the capacitor discharge voltage.

[0038] In this embodiment: Please refer to Figure 3 The capacitor charging unit includes a capacitor C2, an amplifier U2, resistors R6, R7, and R5, and a diode D4. The inverting input of amplifier U2 is connected to one end of capacitor C2 and one end of resistor R5. The non-inverting input of amplifier U2 is connected to one end of resistor R6 and one end of resistor R7. The other end of capacitor C2 is grounded, the other end of resistor R7 is grounded, the other end of resistor R6 is connected to the positive terminal of diode D4 and the output terminal of amplifier U2, and the negative terminal of diode D4 is connected to the other end of resistor R5.

[0039] When the voltage at the inverting input of amplifier U2 is lower than the voltage at the non-inverting input, amplifier U2 outputs a high level, which charges capacitor C2 through diode D4 and resistor R5.

[0040] In this embodiment: Please refer to Figure 3 The capacitor discharge unit includes a switch S1, a potentiometer RP1, a photoresistor RW, and a diode D3. The first terminal of the switch S1 is connected to the inverting terminal of the amplifier U2, the second terminal of the switch S1 is connected to one end of the photoresistor RW, the third terminal of the switch S1 is connected to one end of the potentiometer RP1, the other end of the potentiometer RP1 is connected to the other end of the photoresistor RW and the positive terminal of the diode D3, and the negative terminal of the diode D3 is connected to the output terminal of the amplifier U2.

[0041] When capacitor C2 is charged to the point that the voltage at the inverting input of amplifier U2 is higher than the voltage at the non-inverting input, the output of amplifier U2 is at a low level. Capacitor C2 generates electricity through photoresistor RW (or potentiometer RP1) and diode D3. When capacitor C2 goes low again, amplifier U2 goes high again. This process repeats, generating a PWM signal at the output of amplifier U2.

[0042] When the first and second terminals of switch S1 are connected, it is in automatic dimming mode. At this time, the brighter the ambient light, the smaller the resistance of photoresistor RW, the shorter the discharge time of capacitor C2, the shorter the low-level duration of amplifier U2's output terminal, and the larger the duty cycle of the output PWM signal. Conversely, the dimmer the ambient light, the longer the low-level duration of amplifier U2's output terminal, and the smaller the duty cycle of the output PWM signal.

[0043] When the first and third terminals of the switch are connected, it is in manual dimming mode. In this mode, the user can manually change the resistance of potentiometer RP1 to change the duty cycle of the output PWM signal.

[0044] The brightness of LEDs D1 and D2 is changed by altering the duty cycle of the PWM signal.

[0045] The working principle of this utility model is as follows: the power supply module is used to supply 220V AC power; the step-down rectifier and filter module is used to convert 220V AC power into DC power; the LED driver module is used to adjust the brightness of the LED device based on the input PWM signal; and the brightness control module is used to change the duty cycle of the output PWM signal based on the ambient brightness or manual adjustment.

[0046] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects.

[0047] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An LED intelligent driving control circuit, characterized in that, The LED intelligent driver control circuit includes: The power supply module is used to supply 220V AC power; A step-down rectifier and filter module is used to convert 220V AC power into DC power; LED driver module, used to adjust the brightness of LED devices based on input PWM signal; The brightness control module is used to change the duty cycle of the output PWM signal based on ambient brightness or manual adjustment. The power supply module is connected to the step-down rectifier and filter module, the step-down rectifier and filter module is connected to the LED driver module, and the brightness control module is connected to the LED driver module. The brightness control module includes: The capacitor charging unit is used to charge the capacitor when the voltage at the non-inverting input of the amplifier is higher than the voltage at the inverting input. The capacitor discharge unit is used to discharge the capacitor when the voltage at the inverting input of the amplifier is higher than the voltage at the non-inverting input; the resistance value in the discharge circuit can be changed. The capacitor charging unit is connected to the capacitor discharge voltage.

2. The LED intelligent drive control circuit according to claim 1, wherein, The step-down rectifier and filter module includes a transformer W, diodes D1, D2, D3, and D4, a capacitor C1, an inductor L1, and resistors R1 and R2. The input terminal of transformer W is connected to the power supply module. One output terminal of transformer W is connected to the positive terminal of diode D1 and the negative terminal of diode D3. The other output terminal of transformer W is connected to the positive terminal of diode D2 and the negative terminal of diode D4. The positive terminal of diode D3 is grounded, and the positive terminal of diode D4 is grounded. The negative terminal of diode D1 is connected to the negative terminal of diode D2, one end of capacitor C1, and one end of inductor L1. The other end of capacitor C1 is grounded. The other end of inductor L1 is connected to one end of resistor R1 and one end of resistor R2. The other end of resistor R1 is grounded. The other end of resistor R2 is connected to the LED driver module.

3. The LED intelligent driving control circuit according to claim 1, wherein, The LED driver module includes chip U1, resistors R3 and R4, LED D1, and LED D2. Chip U1 is model NUD4301. Pin 1 of chip U1 is connected to pin 9 of chip U1, the step-down rectifier filter module, the positive terminal of LED D1, and the positive terminal of LED D2. Pin 2 of chip U1 is connected to the brightness control module. Pin 4 of chip U1 is grounded. Pin 5 of chip U1 is grounded through resistor R4. Pin 8 of chip U1 is grounded through resistor R3. Pin 6 of chip U1 is connected to the negative terminal of LED D2. Pin 7 of chip U1 is connected to the negative terminal of LED D1.

4. The LED intelligent drive control circuit of claim 1, wherein, The capacitor charging unit includes capacitor C2, amplifier U2, resistors R6, R7, and R5, and diode D4. The inverting input of amplifier U2 is connected to one end of capacitor C2 and one end of resistor R5. The non-inverting input of amplifier U2 is connected to one end of resistor R6 and one end of resistor R7. The other end of capacitor C2 is grounded, the other end of resistor R7 is grounded, the other end of resistor R6 is connected to the positive terminal of diode D4 and the output terminal of amplifier U2, and the negative terminal of diode D4 is connected to the other end of resistor R5.

5. The LED intelligent drive control circuit of claim 4, wherein, The capacitor discharge unit includes a switch S1, a potentiometer RP1, a photoresistor RW, and a diode D3. The first terminal of the switch S1 is connected to the inverting terminal of the amplifier U2, the second terminal of the switch S1 is connected to one end of the photoresistor RW, the third terminal of the switch S1 is connected to one end of the potentiometer RP1, the other end of the potentiometer RP1 is connected to the other end of the photoresistor RW and the positive terminal of the diode D3, and the negative terminal of the diode D3 is connected to the output terminal of the amplifier U2.

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