Array LED lamp power supply driving system

Abstract

The utility model relates to the technical field of LED lamps, and provides an array LED lamp power supply driving system, which comprises a filter circuit, a boost driving circuit, a current feedback circuit and an isolation modulation circuit which are arranged between a power supply battery and LED lamps, electric energy provided by the power supply battery is firstly processed by the filter circuit, and stable voltage V1 is output; and then the voltage is sent to the boost driving circuit to be boosted, and a higher voltage V2 is generated to drive an LED lamp. Meanwhile, the current feedback circuit monitors the working current of the LED lamp in real time and transmits the information to the isolation modulation circuit. The isolation modulation circuit combines the received PWM1 signal and carries out modulation processing on the signal to generate a modulated PWM2 signal. The PWM2 signal is then sent to the second input end of the boost drive circuit for adjusting the output of the boost drive circuit, thereby realizing accurate control of the brightness or current of the LED lamp. The problems that in the prior art, an LED lamp driving power source is low in driving capacity, unstable in output voltage and current and low in reliability are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of LED lamps, and in particular to a power drive system for an array LED lamp. Background Art

[0002] In recent years, with the continuous improvement of LED performance, LEDs have been increasingly used due to their environmental friendliness, energy saving, and long lifespan. LED lighting is one such application. When designing LED lamps, in addition to considering the circuit functions that can be achieved according to market requirements, more importantly, product stability and safety must be considered. Existing LED drivers on the market suffer from low driving capability, unstable output voltage and current, and low reliability, making them difficult to meet the driver power supply requirements of high-power array LED lamps. Utility Model Content

[0003] The utility model provides an array LED lamp power drive system, which solves the problems of low driving capability, unstable output voltage and current, and low reliability of LED lamp driving power supplies in the prior art.

[0004] The technical solution of the utility model is as follows:

[0005] A power drive system for an array LED lamp includes a filter circuit, a boost drive circuit, a current feedback circuit, and an isolation modulation circuit, arranged between a power supply battery and an LED lamp. The input end of the filter circuit is connected to the power supply battery, and the output end outputs a voltage V1. The voltage V1 is input to the first input end of the boost drive circuit. The output end of the boost drive circuit outputs a voltage V2 to power the LED lamp. The input end of the current feedback circuit is used to detect the operating current of the LED lamp. The output end of the current feedback circuit is connected to the first input end of the isolation modulation circuit. The second input end of the isolation modulation circuit receives a PWM1 signal, and the output end outputs a modulated PWM2 signal. The PWM2 signal is used to be input to the second input end of the boost drive circuit.

[0006] Furthermore, the filter circuit includes a diode D2, a bidirectional thyristor D1, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a capacitor C5, a capacitor C6 and an inductor L1, the anode of the diode D2 is connected to the positive electrode of the power supply battery, the cathode is connected to the first end of the inductor L1, the second end of the inductor L1 outputs a voltage V1, the first end of the bidirectional thyristor D1 is connected to the cathode of the diode D2, and the second end is grounded, the capacitor C1 and the capacitor C2 are connected in series between the cathode of the diode D2 and the ground, the capacitor C3 and the capacitor C4 are connected in parallel between the first end of the inductor L1 and the ground, and the capacitor C5 and the capacitor C6 are connected in parallel between the second end of the inductor L1 and the ground.

[0007] Furthermore, the boost drive circuit includes a resistor R4, a resistor R1, a resistor R2, a resistor R5, an inductor L2, an inductor L3, an inductor L4, a capacitor C7, a capacitor C8, a diode D3, a diode D4 and a transformer T1. The voltage V1 is sequentially input to the primary side of the transformer T1 through the resistor R1 and the inductor L2. The secondary side of the transformer T1 is sequentially connected to the anode of the LED lamp after passing through the resistor R2 and the diode D4. The cathode of the LED lamp is grounded through the resistor R5. The first end of the resistor R4 is connected to the voltage V1, and the second end of the resistor R4 is input with the PWM2 signal.

[0008] Furthermore, the current feedback circuit includes a voltage regulator U4, an operational amplifier U2, an operational amplifier U3, a resistor R6, a resistor R7, a resistor R9 and a resistor R10. The first end of the voltage regulator U4 is connected to the voltage V1 through the resistor R6, the second end of the voltage regulator U4 is grounded, the third end of the voltage regulator U4 is connected to the non-inverting input end of the operational amplifier U2 through the resistor R7, the inverting input end of the operational amplifier U2 is connected to the output end, the output end of the operational amplifier U2 is connected to the inverting input end of the operational amplifier U3 through the resistor R10, the non-inverting input end of the operational amplifier U3 is connected to the remote end of the resistor R5 through the resistor R9, and the output end of the operational amplifier U3 is connected to the isolation modulation circuit.

[0009] Furthermore, the isolation modulation circuit includes an optocoupler U5, a PWM controller U7, a resistor R11 and a resistor R12. The input end of the optocoupler U5 is connected to the output end of the current feedback circuit through the resistor R11, the output end of the optocoupler U5 is connected to pin 2 of the PWM controller U7 through the resistor R12, the pin 4 of the PWM controller U7 is connected to the PWM1 signal, and the pin 6 of the PWM controller U7 outputs the PWM2 signal.

[0010] The working principle and beneficial effects of the utility model are as follows:

[0011] In the present invention, the electrical energy provided by the power supply battery is first processed by a filtering circuit, outputting a stable voltage V1. This voltage is then fed into a boost drive circuit for boosting, generating a higher voltage V2 to drive the LED lamp. Simultaneously, a current feedback circuit monitors the operating current of the LED lamp in real time and transmits this information to an isolation modulation circuit. The isolation modulation circuit modulates the received PWM1 signal to generate a modulated PWM2 signal. This PWM2 signal is then fed into the second input of the boost drive circuit, which is used to adjust the output of the boost drive circuit, thereby achieving precise control of the brightness or current of the LED lamp. This enables real-time monitoring and dynamic adjustment of the operating status of the LED lamp, improving the flexibility and response speed of the power drive system and achieving higher reliability.

[0012] The present invention will be further described in detail below with reference to the accompanying drawings and specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a circuit diagram of the filter circuit in the present utility model;

[0014] Figure 2 This is a circuit diagram of the boost drive circuit in the utility model;

[0015] Figure 3 This is a circuit diagram of the current feedback circuit in the present utility model.

[0016] Figure 4 This is a circuit diagram of the isolation modulation circuit in the utility model. DETAILED DESCRIPTION

[0017] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0018] Example 1

[0019] This embodiment proposes an array LED lamp power drive system, including a filter circuit, a boost drive circuit, a current feedback circuit and an isolation modulation circuit arranged between a power supply battery and an LED lamp. The input end of the filter circuit is connected to the power supply battery, and the output end outputs a voltage V1. The voltage V1 is input to the first input end of the boost drive circuit. The output end of the boost drive circuit outputs a voltage V2 to power the LED lamp. The input end of the current feedback circuit is used to detect the operating current of the LED lamp. The output end of the current feedback circuit is connected to the first input end of the isolation modulation circuit. The second input end of the isolation modulation circuit receives a PWM1 signal, and the output end outputs a modulated PWM2 signal. The PWM2 signal is used to be input to the second input end of the boost drive circuit.

[0020] In this embodiment, the power provided by the power supply battery is first processed by a filtering circuit, outputting a stable voltage V1. This voltage is then fed into a boost drive circuit for boosting, generating a higher voltage V2 to drive the LED lamp. Simultaneously, a current feedback circuit monitors the operating current of the LED lamp in real time and transmits this information to an isolated modulation circuit. The isolated modulation circuit modulates the received PWM1 signal to generate a modulated PWM2 signal. This PWM2 signal is then fed into the second input of the boost drive circuit, which adjusts the output of the boost drive circuit, thereby achieving precise control of the LED lamp's brightness or current. This enables real-time monitoring and dynamic adjustment of the LED lamp's operating status, improving the flexibility and response speed of the power drive system and enhancing reliability.

[0021] In one implementation manner, the PWM1 signal may be sent from the single chip microcomputer to the isolation modulation circuit, which is not limited in this embodiment.

[0022] Further, if Figure 1 As shown, the filter circuit includes a diode D2, a bidirectional thyristor D1, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a capacitor C5, a capacitor C6 and an inductor L1. The anode of the diode D2 is connected to the positive electrode of the power supply battery, the cathode is connected to the first end of the inductor L1, and the second end of the inductor L1 outputs a voltage V1. The first end of the bidirectional thyristor D1 is connected to the cathode of the diode D2, and the second end is grounded. The capacitor C1 and the capacitor C2 are connected in series between the cathode of the diode D2 and the ground, the capacitor C3 and the capacitor C4 are connected in parallel between the first end of the inductor L1 and the ground, and the capacitor C5 and the capacitor C6 are connected in parallel between the second end of the inductor L1 and the ground.

[0023] In this embodiment, the boost drive circuit generates a large inrush current at the moment of turn-on. Therefore, a dual-star thyristor D1 is provided in the filter circuit as a transient voltage suppressor (TVS) to absorb transient overvoltages during circuit turn-on. Diode D2 provides reverse current protection. Capacitors C1 and C2 filter the power signal to prevent stress-induced capacitor breakage and short-circuit failures. Capacitors C3-C6 and inductor L1 form a π-type filter circuit, which further filters the output voltage V1.

[0024] Further, if Figure 2 As shown, the boost drive circuit includes a resistor R4, a resistor R1, a resistor R2, a resistor R5, an inductor L2, an inductor L3, an inductor L4, a capacitor C7, a capacitor C8, a diode D3, a diode D4 and a transformer T1. The voltage V1 is sequentially input to the primary side of the transformer T1 through the resistor R1 and the inductor L2. The secondary side of the transformer T1 is sequentially connected to the anode of the LED lamp through the resistor R2 and the diode D4. The cathode of the LED lamp is grounded through the resistor R5. The first end of the resistor R4 is connected to the voltage V1, and the second end of the resistor R4 is input with the PWM2 signal.

[0025] In this embodiment, the boost drive circuit primarily consists of transformer T1 and its peripheral circuitry. It boosts filtered voltage V1 to generate voltage V2, which powers the LED lamp. Resistor R5 acts as a sampling resistor, sampling the LED lamp's operating current from its remote terminal.

[0026] Further, if Figure 3 As shown, the current feedback circuit includes a voltage regulator U4, an operational amplifier U2, an operational amplifier U3, a resistor R6, a resistor R7, a resistor R9 and a resistor R10. The first end of the voltage regulator U4 is connected to the voltage V1 through the resistor R6, the second end of the voltage regulator U4 is grounded, the third end of the voltage regulator U4 is connected to the non-inverting input terminal of the operational amplifier U2 through the resistor R7, the inverting input terminal of the operational amplifier U2 is connected to the output terminal, the output terminal of the operational amplifier U2 is connected to the inverting input terminal of the operational amplifier U3 through the resistor R10, the non-inverting input terminal of the operational amplifier U3 is connected to the remote end of the resistor R5 through the resistor R9, and the output terminal of the operational amplifier U3 is connected to the isolation modulation circuit.

[0027] In this embodiment, to achieve constant current control of the LED lamp, a current feedback circuit collects the LED lamp's operating current and controls the PWM signal cycle. The LED lamp's operating current is sampled through resistor R5, generating a proportional voltage signal. The reference voltage generated by voltage regulator diode U4 is processed by op amp U2 and compared with this signal via op amp U3, outputting the modulation signal sig.

[0028] Further, if Figure 4 As shown, the isolated modulation circuit includes an optocoupler U5, a PWM controller U7, a resistor R11 and a resistor R12. The input end of the optocoupler U5 is connected to the output end of the current feedback circuit through the resistor R11, and the output end of the optocoupler U5 is connected to pin 2 of the PWM controller U7 through the resistor R12. Pin 4 of the PWM controller U7 is connected to the PWM1 signal, and pin 6 of the PWM controller U7 outputs the PWM2 signal.

[0029] In this embodiment, the output of op amp U3 drives optocoupler U5, whose output is connected to pin 2 of PWM controller NCP1230 to implement current feedback. A PI corrector is used in the current feedback loop to increase the steady-state value of the output current.

[0030] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A power drive system for an array LED lamp, characterized in that: The invention comprises a filter circuit, a boost drive circuit, a current feedback circuit and an isolation modulation circuit arranged between a power supply battery and an LED lamp. The input end of the filter circuit is connected to the power supply battery, and the output end outputs a voltage V1. The voltage V1 is input to the first input end of the boost drive circuit. The output end of the boost drive circuit outputs a voltage V2 to power the LED lamp. The input end of the current feedback circuit is used to detect the operating current of the LED lamp. The output end of the current feedback circuit is connected to the first input end of the isolation modulation circuit. The second input end of the isolation modulation circuit receives a PWM1 signal, and the output end outputs a modulated PWM2 signal. The PWM2 signal is used to be input to the second input end of the boost drive circuit.

2. The array LED lamp power drive system according to claim 1, characterized in that: The filter circuit includes a diode D2, a bidirectional thyristor D1, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a capacitor C5, a capacitor C6 and an inductor L1. The anode of the diode D2 is connected to the positive electrode of the power supply battery, the cathode is connected to the first end of the inductor L1, the second end of the inductor L1 outputs a voltage V1, the first end of the bidirectional thyristor D1 is connected to the cathode of the diode D2, and the second end is grounded. The capacitor C1 and the capacitor C2 are connected in series between the cathode of the diode D2 and the ground, the capacitor C3 and the capacitor C4 are connected in parallel between the first end of the inductor L1 and the ground, and the capacitor C5 and the capacitor C6 are connected in parallel between the second end of the inductor L1 and the ground.

3. The array LED lamp power drive system according to claim 1, characterized in that: The boost drive circuit includes a resistor R4, a resistor R1, a resistor R2, a resistor R5, an inductor L2, an inductor L3, an inductor L4, a capacitor C7, a capacitor C8, a diode D3, a diode D4 and a transformer T1. The voltage V1 is sequentially input to the primary side of the transformer T1 through the resistor R1 and the inductor L2. The secondary side of the transformer T1 is sequentially connected to the anode of the LED lamp through the resistor R2 and the diode D4. The cathode of the LED lamp is grounded through the resistor R5. The first end of the resistor R4 is connected to the voltage V1, and the second end of the resistor R4 is input with the PWM2 signal.

4. The array LED lamp power drive system according to claim 3, characterized in that: The current feedback circuit includes a voltage regulator U4, an operational amplifier U2, an operational amplifier U3, a resistor R6, a resistor R7, a resistor R9 and a resistor R10. The first end of the voltage regulator U4 is connected to the voltage V1 through the resistor R6, the second end of the voltage regulator U4 is grounded, the third end of the voltage regulator U4 is connected to the non-inverting input end of the operational amplifier U2 through the resistor R7, the inverting input end of the operational amplifier U2 is connected to the output end, the output end of the operational amplifier U2 is connected to the inverting input end of the operational amplifier U3 through the resistor R10, the non-inverting input end of the operational amplifier U3 is connected to the remote end of the resistor R5 through the resistor R9, and the output end of the operational amplifier U3 is connected to the isolation modulation circuit.

5. The array LED lamp power drive system according to claim 1, characterized in that: The isolation modulation circuit includes an optocoupler U5, a PWM controller U7, a resistor R11 and a resistor R12. The input end of the optocoupler U5 is connected to the output end of the current feedback circuit through the resistor R11, and the output end of the optocoupler U5 is connected to pin 2 of the PWM controller U7 through the resistor R12. Pin 4 of the PWM controller U7 is connected to the PWM1 signal, and pin 6 of the PWM controller U7 outputs the PWM2 signal.

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