Low-ripple LED driving power supply LC filter optimization circuit

Abstract

The utility model discloses a kind of low ripple LED drive power LC filter optimization circuit, including LC filter optimization circuit, LC filter optimization circuit includes low-frequency signal generating circuit and LC series resonance filter circuit, low-frequency signal generating circuit is electrically connected with LC series resonance filter circuit, low-frequency signal generating circuit includes AC / DC, DC / AC, control circuit and flyback auxiliary power supply, flyback auxiliary power supply is electrically connected with control circuit, AC / DC and control circuit are electrically connected with DC / AC, a kind of low ripple LED drive power LC filter optimization circuit of the utility model, the output sinusoidal wave distortion of the LC series resonance filter circuit used is small, and there is no burr and peak interference, stable and reliable in work, fully comply with technical index;The signal device is mainly composed of four parts: AC / DC rectification, DC / AC inversion, LC resonance filter and the control circuit with CPLD as core, stable output constant voltage constant frequency, no harmonic distortion sinusoidal wave signal.

Description

Technical Field

[0001] This utility model relates to the field of LC filter optimization circuit technology, specifically a low-ripple LED driver power supply LC filter optimization circuit. Background Technology

[0002] LC filter circuits can effectively suppress high-frequency electromagnetic interference on power lines, preventing this interference from entering the power module, thereby maintaining voltage stability, reducing voltage fluctuations, and ensuring stable power module output. This is crucial for improving the reliability and stability of electronic equipment. LC filter circuits can reduce the current surge to bridge rectifier devices during switching power supply startup, thereby extending device lifespan. This is significant for protecting critical electronic components and reducing failure rates. By optimizing the parameters of inductors and capacitors, LC filter circuits can significantly reduce the ripple coefficient of power output, providing a smoother DC output. This is particularly important for applications requiring high-precision DC power supply. Low-frequency signal generators are widely used in the commissioning and testing of power system generator sets and other engineering practices, especially in the commissioning of rotating machinery.

[0003] However, traditional LC filter optimization circuits have the following drawbacks: Traditional LC filter optimization circuits are greatly affected by the environment, and their output sine wave is severely distorted, which brings great inconvenience to the debugging work. Utility Model Content

[0004] The purpose of this invention is to provide a low-ripple LED driver power supply LC filter optimization circuit to solve the problem mentioned in the background art that the traditional LC filter optimization circuit is greatly affected by the environment, and its output sine wave is severely distorted, which brings great inconvenience to the debugging work.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a low-ripple LED driver power supply LC filter optimization circuit, comprising an LC filter optimization circuit, wherein the LC filter optimization circuit includes a low-frequency signal generation circuit and an LC series resonant filter circuit, the low-frequency signal generation circuit being electrically connected to the LC series resonant filter, the low-frequency signal generation circuit including an AC / DC converter, a DC / AC converter, a control circuit, and a flyback auxiliary power supply, the flyback auxiliary power supply being electrically connected to the control circuit, and both the AC / DC converter and the control circuit being electrically connected to the DC / AC converter.

[0006] Preferably, the DC / AC circuit is electrically connected to the LC series resonant filter circuit.

[0007] Preferably, the LC series resonant filter circuit includes an inductor L1, a capacitor C1, and a load. One end of the inductor L1 is connected to one end of the capacitor C1, and the other end of the capacitor C1 is connected to one end of the load.

[0008] Preferably, the other end of L1 and the other end of the load are both connected to DC / AC.

[0009] Preferably, the LC series resonant filter circuit includes an inductor L2, a capacitor C2, a resistor R, and a voltage source connector us. One end of the inductor L2 is connected to one end of the capacitor C2, the other end of the capacitor C2 is connected to one end of the resistor R, the other end of the resistor R is connected to one end of the voltage source connector us, and the other end of the voltage source connector us is connected to the other end of the inductor L2.

[0010] Preferably, the surface of the voltage source connector us is connected to DC / AC.

[0011] Compared with the prior art, the beneficial effects of this utility model are: 1. The output sinusoidal wave of the LC series resonant filter circuit has low distortion and no glitches or spikes, and is stable and reliable in operation. 2. The signal device mainly consists of four parts: AC / DC rectification, DC / AC inversion, LC resonant filtering, and a control circuit with CPLD as the core, which stably outputs a constant voltage and frequency sine wave signal without harmonic distortion. Attached Figure Description

[0012] Figure 1 This is the circuit diagram of this utility model; Figure 2 This is one of the circuit diagrams of the LC series resonant filter circuit of this utility model; Figure 3 This is the second circuit diagram of the LC series resonant filter circuit of this utility model. Detailed Implementation

[0013] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0014] Please see Figure 1-3 This utility model provides a low-ripple LED driver power supply LC filter optimization circuit, including an LC filter optimization circuit, which includes a low-frequency signal generation circuit and an LC series resonant filter circuit. The low-frequency signal generation circuit is electrically connected to the LC series resonant filter. The low-frequency signal generation circuit includes an AC / DC converter, a DC / AC converter, a control circuit, and a flyback auxiliary power supply. The flyback auxiliary power supply is electrically connected to the control circuit. Both the AC / DC converter and the control circuit are electrically connected to the DC / AC converter.

[0015] The DC / AC and LC series resonant filter circuits are electrically connected.

[0016] The LC series resonant filter circuit includes an inductor L1, a capacitor C1, and a load. One end of the inductor L1 is connected to one end of the capacitor C1, and the other end of the capacitor C1 is connected to the load.

[0017] The other end of L1 and the other end of the load are both connected to DC / AC.

[0018] The LC series resonant filter circuit includes an inductor L2, a capacitor C2, a resistor R, and a voltage source connector us. One end of the inductor L2 is connected to one end of the capacitor C2, the other end of the capacitor C2 is connected to one end of the resistor R, the other end of the resistor R is connected to one end of the voltage source connector us, and the other end of the voltage source connector us is connected to the other end of the inductor L2.

[0019] The surface of the voltage source connector us is connected to DC / AC.

[0020] In use, the signal device in this embodiment mainly consists of four parts: AC / DC rectification, DC / AC inversion, LC resonant filtering, and a control circuit with a CPLD as its core. The series impedance of this circuit is: , When the capacitor C = 100uF and 470uF, the values ​​of the filter inductor can be derived as follows: , and The larger the value, the better the resonant filtering effect. The higher the quality factor of the circuit, the sharper the resonance curve, and the better the selectivity of the circuit. Therefore, when resonance occurs, as long as Q is large enough, the harmonic components in the resonant current i0 are very few, and the output current is closer to the sine wave. At this time, the resonant current is basically in phase with the square wave voltage, thus achieving the purpose of filtering out harmonics using the series resonant characteristics.

[0021] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A low-ripple LED driver power supply LC filter optimization circuit, comprising an LC filter optimization circuit, characterized in that: The LC filter optimization circuit includes a low-frequency signal generation circuit and an LC series resonant filter circuit. The low-frequency signal generation circuit is electrically connected to the LC series resonant filter. The low-frequency signal generation circuit includes an AC / DC converter, a DC / AC converter, a control circuit, and a flyback auxiliary power supply. The flyback auxiliary power supply is electrically connected to the control circuit. Both the AC / DC converter and the control circuit are electrically connected to the DC / AC converter.

2. The low-ripple LED driver power supply LC filter optimization circuit according to claim 1, characterized in that: The DC / AC and LC series resonant filter circuits are electrically connected.

3. The low-ripple LED driver power supply LC filter optimization circuit according to claim 1, characterized in that: The LC series resonant filter circuit includes an inductor L1, a capacitor C1, and a load. One end of the inductor L1 is connected to one end of the capacitor C1, and the other end of the capacitor C1 is connected to one end of the load.

4. The low-ripple LED driver power supply LC filter optimization circuit according to claim 3, characterized in that: The other end of L1 and the other end of the load are both connected to DC / AC.

5. The low-ripple LED driver power supply LC filter optimization circuit according to claim 1, characterized in that: The LC series resonant filter circuit includes an inductor L2, a capacitor C2, a resistor R, and a voltage source connector us. One end of the inductor L2 is connected to one end of the capacitor C2, the other end of the capacitor C2 is connected to one end of the resistor R, the other end of the resistor R is connected to one end of the voltage source connector us, and the other end of the voltage source connector us is connected to the other end of the inductor L2.

6. The low-ripple LED driver power supply LC filter optimization circuit according to claim 5, characterized in that: The surface of the voltage source connector us is connected to DC / AC.

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