CN211457458U

CN211457458U - Small-size LED constant current power supply driving module

Info

Publication number: CN211457458U
Application number: CN201921909377.3U
Authority: CN
Inventors: 岳许; 陈景忠
Original assignee: Yangzhou Polytechnic Institute
Current assignee: Jiangsu Hengtong Lighting Group Co Ltd
Priority date: 2019-11-01
Filing date: 2019-11-01
Publication date: 2020-09-08
Anticipated expiration: 2029-11-01

Abstract

The invention (utility model) discloses a small-size LED constant current power supply driving module, which comprises an input 12V circuit, a filter circuit, a high-frequency conversion circuit, a high-frequency rectification filter circuit, an LED constant current lighting circuit, an output sampling circuit, a feedback control circuit, a control component N1, a current type driving circuit and a protection circuit. The device has reasonable overall structure and meets the requirement of the small-size LED constant-current power supply driving module.

Description

Small-size LED constant current power supply driving module

Technical Field

The invention relates to the technical field of LED lighting power supply driving, in particular to a small-size LED constant-current power supply driving module.

Background

In the existing LED lighting power supply driving equipment, the oscillation mode of the power supply conversion circuit can be a self-excitation type or other-excitation type, but the other-excitation type oscillation circuit is relatively stable and convenient to debug. The micro control chip of the separately excited integrated pulse width modulation circuit has few external elements and strong functions, and is increasingly widely applied. The defects of complex circuit, difficult debugging and larger volume of the existing LED lighting power supply need to be solved.

Disclosure of Invention

Aiming at the defects in the prior art, the invention (utility model) provides a small-size LED constant current power supply driving module.

The technical scheme is as follows: the technical scheme adopted by the invention (utility model) to solve the problems is as follows: a small-size LED constant-current power supply driving module comprises an input 12V circuit, a filter circuit, a high-frequency conversion circuit, a high-frequency rectification filter circuit, an LED constant-current lighting circuit, an output sampling circuit, a feedback control circuit, a control component N1, a current type driving circuit and a protection circuit; the input 12V circuit, the filter circuit, the high-frequency conversion circuit, the high-frequency rectification filter circuit, the LED constant-current lighting circuit and the output circuit are sequentially connected, and finally, the output voltage is + 45V; the output sampling circuit is connected with the feedback control circuit, the control component N1 and the current type drive circuit in sequence, outputs an adjustable pulse width signal and adjusts the working time of the high-frequency conversion circuit, thereby stabilizing the output voltage; the protection circuit is connected with the control component N1;

in the 12V input circuit, 12V is input between the No. 1 pin of the XS1 and the No. 2 pin of the XS1, the No. 2 pin of the XS2 is grounded, and filtering is performed by capacitors C1 and C2; the high-frequency conversion circuit comprises resistors R1, R2 and R3, a transformer T1, a control component N1, a diode V1, capacitors C3 and C4, wherein 12V power supply input is subjected to current detection by the R1 and is sent to a No. 1 pin of the transformer T1 and is simultaneously sent to a No. 7 pin of the control component N1, a resistor R2 is bridged between the No. 7 pin and the No. 8 pin of the control component N1, a No. 2 pin of the control component N1 is output to an anode of the diode V1, a cathode of the diode V1 is driven by the resistor R4, the capacitor C5 and a triode V3, so that the working time of the transformer T1 is adjusted, and output voltage is stabilized;

the current type driving circuit comprises R4, a capacitor C5 and a triode V3, a No. 3 pin of a control component N1 is externally connected with the capacitor C4 to determine the oscillation frequency of the high-frequency conversion circuit, and a No. 6 pin of a control component N1 is connected with an input 12V; the high-frequency rectifying and filtering circuit is characterized in that an alternating current signal between a No. 4 pin and a No. 5 pin of a transformer T1 is subjected to high-frequency rectification by a diode V2, filtering by a capacitor C6, outputting +45V voltage by the No. 3 pin of an XS1, grounding the No. 4 pin of the XS1, and driving a 3 multiplied by 10 LED to illuminate;

the output circuit comprises 3 branches, and each branch comprises 10 LED light-emitting tubes; the output sampling circuit comprises a potentiometer R5, resistors R3, R6, a capacitor C3 and a control component N1; the potentiometer R5, the resistor R3 and the resistor R6 form a voltage division circuit, and a divided voltage value is input to a No. 5 pin of the control component N1 to control the conduction time of the triode V3 and the working time of the transformer T1 so as to adjust the output voltage;

in the protection circuit, 12V is input to a No. 7 pin of a control component N1 through a resistor R1, and input current is detected, so that the small-size LED constant-current lighting power supply driving module is protected;

the circuits are concentrated on a circuit board with an area of 30 × 50mm²And a surface mount device is employed.

Compared with the prior art, the small-size LED constant-current power supply driving module has the advantages that the small-size LED constant-current power supply driving module samples the LED constant-current lighting circuit, performs feedback control to the No. 5 pin of the control component N1 to drive the triode V3, so that the working time of the transformer T1 is adjusted, the output voltage is stabilized, the circuit is convenient to debug, a surface-mounted device is adopted, and the area of a circuit board is only 30 × 50mm and 50mm²The integral structure is reasonable in arrangement, and the requirement of small volume is met.

Drawings

FIG. 1 is a schematic diagram of the present invention (utility model);

fig. 2 is a circuit diagram of the present invention (utility model);

Detailed Description

The present invention will be further explained with reference to the accompanying drawings and specific examples, which are implemented on the premise of the technical solution of the present invention (utility model), and it should be understood that these examples are only used for illustrating the present invention (utility model) and are not used for limiting the scope of the present invention (utility model).

As shown in fig. 1, the technical solution adopted by the invention (utility model) to solve the problem is: a small-size LED constant-current power supply driving module comprises an input 12V circuit, a filter circuit, a high-frequency conversion circuit, a high-frequency rectification filter circuit, an LED constant-current lighting circuit, an output sampling circuit, a feedback control circuit, a control component N1, a current type driving circuit and a protection circuit.

The input 12V circuit, the filter circuit, the high-frequency conversion circuit, the high-frequency rectification filter circuit, the LED constant-current lighting circuit and the output circuit are connected in sequence, and finally the voltage is + 45V.

The output sampling circuit is connected with the feedback control circuit, the control component N1 and the current type drive circuit in sequence, outputs an adjustable pulse width signal, and adjusts the working time of the high-frequency conversion circuit, thereby stabilizing the output voltage.

The protection circuit is connected with the control component N1.

As shown in fig. 2, in the 12V input circuit according to the present invention (utility model), 12V is input between pin 1 of XS1 and pin 2 of XS1, and pin 2 of XS2 is grounded. Filtering is performed by capacitors C1, C2.

As shown in fig. 2, the high frequency conversion circuit includes resistors R1, R2, R3, a transformer T1, a control module N1, a diode V1, capacitors C3 and C4, a 12V power input is subjected to current detection by the R1, and is sent to pin 1 of the transformer T1 and pin 7 of the control module N1, the resistor R2 is connected across the pin 7 and pin 8 of the control module N1, the pin 2 of the control module N1 is output to the anode of the diode V1, and the cathode of the diode V1 drives a triode V3 through the resistor R4 and the capacitor C5, thereby adjusting the operating time of the transformer T1 and stabilizing the output voltage.

As shown in fig. 2, the current-mode driving circuit includes R4, a capacitor C5, a transistor V3, a pin 3 of a control module N1 externally connected to the capacitor C4 to determine the oscillation frequency of the high-frequency conversion circuit, and a pin 6 of a control module N1 connected to the input 12V.

As shown in FIG. 2, the high frequency rectifying and filtering circuit is formed by high frequency rectifying an alternating current signal between pin No. 4 and pin No. 5 of a transformer T1 through a diode V2, filtering the alternating current signal through a capacitor C6, outputting +45V voltage through pin No. 3 of an XS1, grounding pin No. 4 of the XS1, and driving a 3 × 10 LED to illuminate.

As shown in FIG. 2, the output circuit consists of 3 branches, each branch consisting of 10 LED tubes.

As shown in fig. 2, the output sampling circuit includes a potentiometer R5, resistors R3, R6, a capacitor C3, and a control element N1; the potentiometer R5, the resistor R3 and the resistor R6 form a voltage division circuit, a divided voltage value is input to a No. 5 pin of the control assembly N1, is output from a No. 2 pin of the control assembly N1 and drives the triode V3 through the diode V1, and therefore the working time of the transformer T1 is adjusted, and output voltage is stabilized.

As shown in fig. 2, in the protection circuit, 12V is input to pin No. 7 of the control component N1 through a resistor R1, and an input current is detected, so that a small-size LED constant current power supply driving module is protected.

All circuits are intensively arranged on the circuit board, and the area is only 30 × 50mm²The LED constant-current lighting circuit is integrally sampled and feedback-controlled to the No. 5 pin of the control component N1, the LED constant-current lighting circuit is output from the No. 2 pin of the control component N1 and passes through the diode V1 to drive the triode V3, so that the working time of the transformer T1 is adjusted, the output voltage is stabilized, the circuit debugging is convenient, a surface-mounted device is adopted, and the area of the circuit board is only 30 × 50mm²The integral structure is reasonable in arrangement, and the requirement of small volume is met.

The above-described embodiment is only a preferred embodiment of the present invention (utility model) and is not intended to limit the scope of the invention (utility model) and the claims, and all equivalent changes and modifications made according to the content of the claims of the present invention (utility model) should be included in the scope of the claims of the present invention.

Claims

1. The utility model provides a little volume LED constant current power supply drive module which characterized in that: the LED constant-current lighting circuit comprises an input 12V circuit, a filter circuit, a high-frequency conversion circuit, a high-frequency rectification filter circuit, an LED constant-current lighting circuit, an output sampling circuit, a feedback control circuit, a control component N1, a current type drive circuit and a protection circuit; the input 12V circuit, the filter circuit, the high-frequency conversion circuit, the high-frequency rectification filter circuit, the LED constant-current lighting circuit and the output circuit are sequentially connected, and finally, the output voltage is + 45V; the output sampling circuit is sequentially connected with the feedback control circuit, the control component N1 and the current type driving circuit, outputs an adjustable pulse width signal and adjusts the working time of the high-frequency conversion circuit, thereby stabilizing the output voltage; the protection circuit is connected with the control component N1; in the 12V input circuit, 12V is input between the No. 1 pin of the XS1 and the No. 2 pin of the XS1, the No. 2 pin of the XS2 is grounded, and filtering is performed by capacitors C1 and C2.

2. The small-size LED constant-current power supply driving module according to claim 1, characterized in that: the high-frequency conversion circuit comprises resistors R1, R2 and R3, a transformer T1, a control component N1, a diode V1 and capacitors C3 and C4, wherein the 12V power supply input is subjected to current detection by the R1 and is sent to a pin 1 of a transformer T1 and is simultaneously sent to a pin 7 of the control component N1, a resistor R2 is bridged between the pin 7 and the pin 8 of the control component N1, a pin 2 of the control component N1 is output to the anode of the diode V1, and the cathode of the diode V1 is driven by a resistor R4, the capacitor C5 and a triode V3, so that the working time of the transformer T1 is adjusted, and the output voltage is stabilized.

3. The small-size LED constant-current power supply driving module according to claim 2, characterized in that: the current type driving circuit comprises R4, a capacitor C5 and a triode V3, a No. 3 pin of a control component N1 is externally connected with the capacitor C4 to determine the oscillation frequency of the high-frequency conversion circuit, and a No. 6 pin of the control component N1 is connected with an input 12V.

4. The small-size LED constant-current power supply driving module according to claim 3, characterized in that: the high-frequency rectifying and filtering circuit is characterized in that an alternating current signal between a pin 4 and a pin 5 of a transformer T1 is subjected to high-frequency rectification by a diode V2, filtering by a capacitor C6, outputting +45V voltage by a pin 3 of an XS1, grounding the pin 4 of the XS1, and driving a 3 x 10 LED to illuminate by constant current.

5. The small-size LED constant-current power supply driving module according to claim 3, characterized in that: the output circuit comprises 3 branches, and each branch comprises 10 LED light-emitting tubes.

6. The small-size LED constant-current power supply driving module according to claim 3, characterized in that: the output sampling circuit comprises a potentiometer R5, resistors R3, R6, a capacitor C3 and a control component N1; the potentiometer R5, the resistor R3 and the resistor R6 form a voltage division circuit, a divided voltage value is input to the No. 5 pin of the control assembly N1, and the divided voltage value is compared with a voltage reference source in the control assembly N1 to adjust an RS trigger in the control assembly N1, so that the conduction time of the triode V3 is controlled, and the output voltage is adjusted.

7. The small-size LED constant-current power supply driving module according to claim 3, characterized in that: in the protection circuit, 12V is input to a No. 7 pin of a control assembly N1 through a resistor R1, and input current is detected, so that the small-size LED constant current power supply driving module is protected.

8. The small-size LED constant current power supply driving module as claimed in claim 3, wherein the circuits are concentrated on a circuit board, a surface-mounted device is adopted, and the area of the circuit board is set to be 30 × 50mm and 50mm²。