Constant current driving power supply circuit for LED
By combining a DC step-down module and a constant current driver, the problem of LED lamp damage caused by unstable voltage and excessive load is solved, achieving voltage stability, constant current, and fault detection, thus extending the lifespan of LED lamps.
Patent Information
- Application Number
- CN202520159267.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-23
- Publication Date
- 2026-02-10
- Estimated Expiration
- 2035-01-23
AI Technical Summary
LED lights are prone to damage during operation due to unstable voltage or excessive load, and existing technologies are unable to effectively solve this problem.
It uses a DC step-down module in conjunction with a constant current driver to stabilize the voltage and provide a constant current. When an abnormal voltage is detected, a fault signal is triggered to prevent damage.
It achieves stable voltage and constant current for LED lights, reduces heat generation, extends service life, and enables timely detection of abnormalities, facilitating maintenance.
Smart Images
Figure CN223899369U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to drive circuit technical field, in particular to a kind of constant-current drive power supply circuit for LED. BACKGROUND
[0002] In electronic technology circuit, due to the normal working voltage drop of LED lamp is between 1.2~1.4V, the signal stability requirement of output is higher.For example, when the input voltage signal is too high, it is easy to cause LED burnout or affect service life.In practice, when LED drive power is unstable, the output voltage signal can be too high, which can easily damage the LED in the subsequent circuit.Or when the output load is too large during the working process of LED constant-current source drive, local short circuit occurs in internal components or external circuit, and the load LED appears overcurrent, which can easily damage the LED. SUMMARY
[0003] Therefore, it is necessary to provide a constant-current drive power supply circuit for LED to solve the above problems.
[0004] A constant-current drive power supply circuit for LED includes a connector PL1, a fuse FL1, a DC voltage reduction module UL1, a constant-current driver UL2, a resistor R1, capacitors C1 and C2 and a plurality of light emitting diodes D.The plurality of light emitting diodes D are connected in series.The 3-pin of the connector PL1 is connected to the 1-pin of the fuse FL1.The 2-pin of the fuse FL1 is connected to the 1-pin of the DC voltage reduction module UL1.The 2-pin of the DC voltage reduction module UL1 is connected to the 1-pin of the connector PL1.The 3-pin of the DC voltage reduction module UL1 is connected to the 1-pin of the constant-current driver UL2.The 2-pin of the constant-current driver UL2 is connected to the anode of the first light emitting diode D.The 3-pin of the constant-current driver UL2 is connected to the anode of the first light emitting diode D after being connected in series with the resistor R1.The 2-pin of the connector PL1 is connected to the anode of the first light emitting diode D.The 1-pin of the connector PL1 is connected to the cathode of the last light emitting diode D.One end of the capacitor C1 is connected to the 1-pin of the DC voltage reduction module UL1, and the other end is connected to the 1-pin of the connector PL1.One end of the capacitor C2 is connected to the 3-pin of the DC voltage reduction module UL1, and the other end is connected to the 1-pin of the connector PL1.
[0005] Preferably, the direct current voltage reduction module UL1 comprises a direct current converter U6, a linear voltage stabilizer U5, capacitors C3-C8, an inductor L1, resistors R2-R4, and a fuse FL1, wherein the 2-pin of the fuse FL1 is connected in series with the resistor R2 and the capacitor C3 in sequence and then grounded, one end of the inductor L1 is connected between the resistor R2 and the capacitor C3, the other end of the inductor L1 is connected with the 2-pin of the direct current converter U6, one end of the capacitor C4 is grounded, the other end of the capacitor C4 is connected with the 2-pin of the direct current converter U6, the 1-pin of the direct current converter U6 is grounded with the capacitors C3 and C4, the 6-pin and the 7-pin of the direct current converter U6 are grounded through the capacitors C5 and C6 respectively, the 6-pin of the direct current converter U6 is connected with the 3-pin of the linear voltage stabilizer U5, the 3-pin of the linear voltage stabilizer U5 is grounded through the capacitor C7, the 1-pin of the linear voltage stabilizer U5 is grounded, the 2-pin of the linear voltage stabilizer U5 is grounded through the capacitor C8 and the resistor R3 in parallel, one end of the resistor R4 is connected with the 2-pin of the linear voltage stabilizer U5, and the other end of the resistor R4 is connected with the 1-pin of the constant current driver UL2.
[0006] Preferably, the model of the constant current driver UL2 is LM317, the model of the direct current converter U6 is WRB2405S-3WR2, and the model of the linear voltage stabilizer U5 is ASM1173.3.
[0007] Preferably, the number of the light emitting diodes D is seven.
[0008] The utility model discloses a beneficial effect lies in: utilize direct current voltage reduction module UL1 and constant current driver UL2 cooperation, stabilize the voltage of series connection light emitting diode D, realize constant current drive, reduce the heat that light emitting diode D produces in the working process, reduce its risk of damage due to overheating, prolong its service life, and after light emitting diode D abnormal working resistance reduces below the preset value, trigger the fault signal, the backstage control room is convenient for promptly troubleshooting. BRIEF DESCRIPTION OF DRAWINGS
[0009] Figure 1 It is a LED constant current drive power supply circuit schematic diagram for one embodiment;
[0010] Figure 2 It is the circuit diagram of direct current voltage reduction module UL1. DETAILED DESCRIPTION
[0011] In order to make the above-mentioned purpose, features and advantages of the utility model more obvious and easy to understand, the specific implementation of the utility model is described in detail below. In the following description, a lot of specific details are set forth in order to fully understand the utility model. However, the utility model can be implemented in many other ways different from the description herein, and those skilled in the art can make similar improvements without departing from the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.
[0012] It is to be understood that when an element such as a layer, region or substrate is referred to as being "on" or "connected to" another element, it can be directly on or connected to the other element or intervening elements can be present. In contrast, when an element is referred to as being "directly on" or "directly connected to" another element, there are no intervening elements present. It will be understood that, although the terms "first", "second", etc. can be used herein to describe various elements, these elements should not be limited by these terms since such elements are commonly called by different names in different contexts. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element without departing from the scope of example embodiments. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.
[0013] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.
[0014] As Figure 1As shown, a constant current driving power supply circuit for LED includes a connector PL1, a fuse FL1, a DC voltage reduction module UL1, a constant current driver UL2, resistors R1, capacitors C1 and C2, and a plurality of light emitting diodes D. The plurality of light emitting diodes D are connected in series. The 3-pin of the connector PL1 is connected to the 1-pin of the fuse FL1. The 2-pin of the fuse FL1 is connected to the 1-pin of the DC voltage reduction module UL1. The 2-pin of the DC voltage reduction module UL1 is connected to the 1-pin of the connector PL1. The 3-pin of the DC voltage reduction module UL1 is connected to the 1-pin of the constant current driver UL2. The 2-pin of the constant current driver UL2 is connected to the positive terminal of the first light emitting diode D. The 3-pin of the constant current driver UL2 is connected to the positive terminal of the first light emitting diode D through the resistor R1. The 2-pin of the connector PL1 is connected to the positive terminal of the first light emitting diode D. The 1-pin of the connector PL1 is connected to the negative terminal of the last light emitting diode D. One end of the capacitor C1 is connected to the 1-pin of the DC voltage reduction module UL1, and the other end is connected to the 1-pin of the connector PL1. One end of the capacitor C2 is connected to the 3-pin of the DC voltage reduction module UL1, and the other end is connected to the 1-pin of the connector PL1. Specifically, in this embodiment, the 24V DC voltage input from the outside is input to the DC voltage reduction module UL1 through the fuse FL1. The DC voltage is reduced to 12V by the DC voltage reduction module UL1, and then the voltage is stabilized by the constant current driver UL2 to supply the light emitting diodes D connected in series. The DC voltage reduction module UL1 and the constant current driver UL2 cooperate to provide a stable current output, which remains constant regardless of the change in input voltage. At the same time, the 2-pin of the connector PL1 is used to detect the voltage on the circuit of the plurality of light emitting diodes D connected in series. In this embodiment, the number of light emitting diodes D connected in series is 7. It is known that the normal working voltage drop of the light emitting diode D is 1.2-1.4V, and the total voltage is 8.4-8.9V. Therefore, when the light emitting diode D is found to work abnormally at a lower voltage, a fault signal is triggered. The 2-pin of the connector PL1 obtains the highest voltage of the light emitting diode D, which is fed back to the background controller to output a light emitting diode D fault signal, facilitating maintenance and repair. When the light emitting diodes D connected in series are disconnected, there is no voltage output at IN4.
[0015] As Figures 1-2As shown, the direct current voltage reduction module UL1 includes a direct current converter U6, a linear voltage regulator U5, capacitors C3-C8, an inductor L1, resistors R2-R4, and a fuse FL1. The 2-pin of the fuse FL1 is connected in series with the resistor R2 and the capacitor C3, and then grounded. One end of the inductor L1 is connected between the resistor R2 and the capacitor C3, and the other end is connected with the 2-pin of the direct current converter U6. One end of the capacitor C4 is grounded, and the other end is connected with the 2-pin of the direct current converter U6. The 1-pin of the direct current converter U6 is grounded with the capacitors C3 and C4. The 6-pin and 7-pin of the direct current converter U6 are grounded through the capacitors C5 and C6, respectively. The 6-pin of the direct current converter U6 is connected with the 3-pin of the linear voltage regulator U5. The 3-pin of the linear voltage regulator U5 is grounded through the capacitor C7. The 1-pin of the linear voltage regulator U5 is grounded. The 2-pin of the linear voltage regulator U5 is grounded through the capacitor C8 and the resistor R3 in parallel. One end of the resistor R4 is connected with the 2-pin of the linear voltage regulator U5, and the other end is connected with the 1-pin of the constant current driver UL2. Specifically, the resistor R2 and the capacitor C3 are connected in series to form a high-pass filter circuit. One end of the inductor L1 is connected between the resistor R2 and the capacitor C3, which can store or release electric energy when the current changes, smooth the current fluctuation, and avoid burning the direct current converter U6. The ground capacitors are arranged between the direct current converter U6 and the linear voltage regulator U5 for filtering, so that the direct current is smoother. The output end of the linear voltage regulator U5 is connected with the resistor R4 for current limiting.
[0016] Specifically, the model of the constant current driver UL2 is LM317, the model of the direct current converter U6 is WRB2405S-3WR2, and the model of the linear voltage regulator U5 is ASM1173.3.
[0017] The above embodiments only express several implementation manners of the present application, and the description is more specific and detailed, but it should not be understood as a limitation on the scope of the application. It should be noted that, for those skilled in the art, without departing from the concept of the present application, some modifications and improvements can be made, which are all within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.
Claims
1. A constant current driving power supply circuit for LEDs, characterized in that: The circuit includes connector PL1, fuse FL1, DC-DC step-down module UL1, constant current driver UL2, resistor R1, capacitors C1 and C2, and several LEDs D connected in series. Pin 3 of connector PL1 is connected to pin 1 of fuse FL1, pin 2 of fuse FL1 is connected to pin 1 of DC-DC step-down module UL1, pin 2 of DC-DC step-down module UL1 is connected to pin 1 of connector PL1, pin 3 of DC-DC step-down module UL1 is connected to pin 1 of constant current driver UL2, and pin 2 of constant current driver UL2 is connected to pin 3 of connector PL1. Pin 3 of the constant current driver UL2 is connected to the positive terminal of the first LED D. Pin 3 of the constant current driver UL2 is connected to the positive terminal of the first LED D after series resistor R1. Pin 2 of the connector PL1 is connected to the positive terminal of the first LED D. Pin 1 of the connector PL1 is connected to the negative terminal of the last LED D. One end of capacitor C1 is connected to pin 1 of the DC step-down module UL1, and the other end is connected to pin 1 of the connector PL1. One end of capacitor C2 is connected to pin 3 of the DC step-down module UL1, and the other end is connected to pin 1 of the connector PL1.
2. The constant current drive power supply circuit for LEDs as described in claim 1, characterized in that: The DC-DC step-down module UL1 includes a DC-DC converter U6, a linear regulator U5, capacitors C3 to C8, an inductor L1, and resistors R2 to R4. Fuse FL1 has its pin 2 connected to ground via resistor R2 and capacitor C3 in series. One end of inductor L1 is connected between resistor R2 and capacitor C3, and the other end is connected to pin 2 of DC-DC converter U6. One end of capacitor C4 is grounded, and the other end is connected to pin 2 of DC-DC converter U6. Pin 1 of DC-DC converter U6 shares a common ground with capacitors C3 and C4. Pins 6 and 7 of DC-DC converter U6 are grounded via capacitors C5 and C6, respectively. Pin 6 of DC-DC converter U6 is connected to pin 3 of linear regulator U5. Pin 3 of linear regulator U5 is grounded via capacitor C7, pin 1 is grounded, and pin 2 is grounded via a parallel capacitor C8 and resistor R3. One end of resistor R4 is connected to pin 2 of linear regulator U5, and the other end is connected to pin 1 of constant current driver UL2.
3. The constant current drive power supply circuit for LEDs as described in claim 2, characterized in that: The constant current driver UL2 is model LM317, the DC converter U6 is model WRB2405S-3WR2, and the linear regulator U5 is model ASM1173.
3.
4. The constant current drive power supply circuit for LEDs as described in claim 1, characterized in that: The number of light-emitting diodes D is seven.