Lightning protection circuit of single-stage electroless PFC (Power Factor Correction)
By designing a single-stage electrolytic PFC lightning protection circuit including rectifier module, main circuit, resistor, electrolytic capacitor and diode, the problem of poor absorption capacity of single-stage PFC switching power supply in lightning strike test is solved, and higher lightning strike resistance and test pass rate are achieved.
Patent Information
- Application Number
- CN202421875097.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-02
- Publication Date
- 2025-05-23
- Estimated Expiration
- 2034-08-02
AI Technical Summary
The single-stage PFC switching power supply has poor absorption capacity during lightning strike tests, which makes the test easy to fail, and the existing lightning protection circuit cannot effectively absorb the surge voltage.
A single-stage electrolytic PFC-free lightning protection circuit is designed, including a rectifier module, a main circuit, a resistor R4, a resistor R5, an electrolytic capacitor EC2 and a diode D1, and the surge voltage is absorbed through the connection structure of these components.
It significantly improves the pass rate of lightning strike test of single-stage electrolytic PFC power supply, reduces the residual voltage of the later stage, and improves the overall lightning strike resistance of the power supply.
Smart Images
Figure CN222897188U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of power supply circuits and controller circuits, in particular to a single-stage electrolytic PFC-free lightning protection circuit. Background Art
[0002] With the development of science and technology, switching power supplies have flourished in the electronics industry, and single-stage PFC switching power supplies have also been greatly favored. At present, the lightning protection circuits used in the industry are all composed of varistors and discharge tubes. In PFC switching power supplies with electrolytic capacitors, due to the presence of electrolytic capacitors in the circuit, the ability to absorb surge voltage will be much stronger, but the single-stage PFC rectifier output does not have electrolytic capacitors. Lightning strikes rely solely on varistors, and there is no component to absorb the residual pressure in the later stage. During the lightning strike test, the absorption capacity becomes poor and the test is likely to fail. Therefore, it is very necessary to invent a single-stage non-electrolytic PFC lightning protection circuit. Utility Model Content
[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model proposes a single-stage non-electrolytic PFC lightning protection circuit.
[0004] An embodiment of the utility model adopts a technical solution to solve its technical problem: a single-stage electrolytic PFC-free lightning protection circuit, including a rectifier module, a main circuit, a resistor R4, a resistor R5, an electrolytic capacitor EC2 and a diode D1, the input end of the rectifier module is connected to an external power supply, the output end of the rectifier module is connected to the input end of the main circuit and the anode of the diode D1, the cathode of the diode D1 is connected to one end of the resistor R4 and the positive electrode of the electrolytic capacitor EC2, the other end of the resistor R4 is connected to one end of the resistor R5, and the negative electrode of the electrolytic capacitor EC2 and the other end of the resistor R5 are connected to the GND end.
[0005] As one of the preferred embodiments of the utility model, the main circuit includes an inductor L1, an electrolytic capacitor EC1, an electrolytic capacitor EC3, a capacitor C3-C4, a capacitor C1-C2, a resistor R1-10, a MOS tube Q1, a diode D2-D4, a transformer T1 and a power chip U1. The first end of the capacitor C1, the first end of the resistor R2, and the first end of the inductor L1 are connected to the output end of the rectifier module. The second end of the inductor L1 is connected to the second end of the resistor R2, the first end of the capacitor C2, the first end of the resistor R3, the first end of the capacitor C3, the first end of the resistor R1 and the first end of the transformer T1. The second end of the capacitor C3 is connected to the second end of the resistor R1 and the cathode of the diode D3. The anode of the diode D3 is connected to the second end of the transformer T1 and the drain of the MOS tube Q1. The second end of the resistor R3 is connected to the first end of the resistor R6, the positive electrode of the electrolytic capacitor EC3, and the first end of the power chip U1. The first end of the resistor R10 is connected to the sixth end of the power chip U1 and the source of the MOS tube Q1. The negative electrode of the electrolytic capacitor EC3, the second end of the resistor R10, the second end of the power chip U1, the sixth end of the transformer T1, the second end of the resistor R7, the second end of the capacitor C1, and the second end of the capacitor C2 are connected to the GND end. The anode of the diode D2 is connected to the third end of the transformer T1. The cathode of the diode D2 is connected to the positive electrode of the electrolytic capacitor EC1 and one end of the load. The fourth end of the transformer T1 and the other end of the load are connected to the SGND end.
[0006] As one of the preferred embodiments of the present utility model, the capacitor C1 and the capacitor C2 are configured as CBB capacitors.
[0007] As one of the preferred embodiments of the present utility model, the rectifier module is configured as a rectifier bridge BD1.
[0008] The beneficial effects of the utility model include: a single-stage electroless PFC lightning protection circuit, comprising a rectifier module, a main circuit, a resistor R4, a resistor R5, an electrolytic capacitor EC2 and a diode D1, wherein the input end of the rectifier module is connected to an external power supply, the output end of the rectifier module is connected to the input end of the main circuit and the anode of the diode D1, the cathode of the diode D1 is connected to one end of the resistor R4 and the positive electrode of the electrolytic capacitor EC2, the other end of the resistor R4 is connected to one end of the resistor R5, and the negative electrode of the electrolytic capacitor EC2 and the other end of the resistor R5 are connected to the GND end; through the above structure, the effect of passing the lightning protection test of the single-stage electroless PFC power supply can be significantly increased, the residual voltage of the later stage can be greatly reduced, the overall lightning resistance of the power supply can be improved, and it has very good practicality. BRIEF DESCRIPTION OF THE DRAWINGS
[0009] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:
[0010] Figure 1 It is a principle block diagram of a single-stage electrolytic PFC-free lightning protection circuit;
[0011] Figure 2 The schematic diagram of a single-stage electrolytic PFC-free lightning protection circuit. DETAILED DESCRIPTION
[0012] This section will describe in detail the specific embodiments of the utility model. The preferred embodiments of the utility model are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the utility model, but it cannot be understood as a limitation on the protection scope of the utility model.
[0013] In the description of the present utility model, the meaning of "more than" is more than two, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.
[0014] In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.
[0015] In the present invention, unless otherwise clearly defined, the words "set", "install", "connect" and the like should be understood in a broad sense, for example, they can be directly connected or indirectly connected through an intermediate medium; they can be fixedly connected or detachably connected or integrally formed; they can be mechanically connected; they can be the internal connection of two elements or the interaction relationship between two elements. Those skilled in the art can reasonably determine the specific meanings of the above words in the present invention in combination with the specific content of the technical solution.
[0016] Reference Figure 1 to Figure 2A single-stage electrolytic PFC-free lightning protection circuit includes a rectifier module 10, a main circuit 20, a resistor R4, a resistor R5, an electrolytic capacitor EC2 and a diode D1, wherein the input end of the rectifier module 10 is connected to an external power supply, the output end of the rectifier module 10 is connected to the input end of the main circuit 20 and the anode of the diode D1, the cathode of the diode D1 is connected to one end of the resistor R4 and the positive electrode of the electrolytic capacitor EC2, the other end of the resistor R4 is connected to one end of the resistor R5, and the negative electrode of the electrolytic capacitor EC2 and the other end of the resistor R5 are connected to the GND end.
[0017] In the utility model, when the system is powered on, the voltage input by the external power supply enters the main circuit 20 after being rectified by the rectifier module 10, and the voltage output to the load is controlled by the main circuit 20, and the lightning protection circuit 30 can absorb part of the surge voltage; the above structure can significantly increase the effect of passing the lightning protection test of the single-stage non-electrolytic PFC power supply, greatly reduce the residual voltage of the rear stage, and improve the overall lightning resistance of the power supply, which has very good practicality. .
[0018] As a preferred embodiment of the main circuit 20, the main circuit 20 includes an inductor L1, an electrolytic capacitor EC1, an electrolytic capacitor EC3, capacitors C3-C4, capacitors C1-C2, resistors R1-10, a MOS tube Q1, diodes D2-D4, a transformer T1 and a power chip U1. The first end of the capacitor C1, the first end of the resistor R2, and the first end of the inductor L1 are connected to the output end of the rectifier module 10. The second end of the inductor L1 is connected to the second end of the resistor R2, the first end of the capacitor C2, the first end of the resistor R3, the first end of the capacitor C3, the first end of the resistor R1 and the first end of the transformer T1. The second end of the capacitor C3 is connected to the second end of the resistor R1 and the cathode of the diode D3. The anode of the diode D3 is connected to the second end of the transformer T1 and the drain of the MOS tube Q1. The second end of the resistor R3 is connected to the first end of the resistor R6, the positive electrode of the electrolytic capacitor EC3, and the first end of the power chip U1. One end is connected, the second end of the resistor R6 is connected to the cathode of the diode D4, the anode of the diode D4 is connected to the fifth end of the transformer T1 and the first end of the resistor R8, the second end of the resistor R8 is connected to the first end of the resistor R7 and the third end of the power chip U1, the resistor R9 is connected between the fourth end of the power chip U1 and the gate of the MOS tube Q1, the first end of the resistor R10 is connected to the sixth end of the power chip U1 and the source of the MOS tube Q1, the negative electrode of the electrolytic capacitor EC3, the second end of the resistor R10, the second end of the power chip U1, the sixth end of the transformer T1, the second end of the resistor R7, the second end of the capacitor C1, and the second end of the capacitor C2 are connected to the GND end, the anode of the diode D2 is connected to the third end of the transformer T1, the negative electrode of the diode D2 is connected to the positive electrode of the electrolytic capacitor EC1 and one end of the load, and the fourth end of the transformer T1 and the other end of the load are connected to the SGND end.
[0019] Specifically, the inductor L1, the electrolytic capacitor EC1, the electrolytic capacitor EC3, the capacitors C3-C4, the capacitors C1-C2, the resistors R1-10, the MOS tube Q1, the diodes D2-D4, the transformer T1 and the power chip U1 constitute the power management part of the single-stage PFC switching power supply. The power chip U1 outputs a PWM signal to control the on and off of the MOS tube Q1 to control the power conversion of the transformer T1; the resistor R4, the resistor R5, the electrolytic capacitor EC2 and the diode D1 constitute a lightning protection circuit 30; through the above structure, after the system is powered on and works normally, the instantaneous surge voltage generated during the lightning protection experiment test can be absorbed by the lightning protection circuit composed of the resistor R4, the resistor R5, the electrolytic capacitor EC2 and the diode D1, which can greatly reduce the residual voltage of the later stage and improve the overall lightning resistance of the power supply, and has very good practicality.
[0020] In one embodiment, the capacitor C1 and the capacitor C2 are configured as CBB capacitors.
[0021] In one embodiment, the rectifier module 10 is configured as a rectifier bridge BD1 .
[0022] Of course, the present invention is not limited to the above-mentioned embodiments, and technicians familiar with the field may make equivalent modifications or substitutions without violating the spirit of the present invention. These equivalent modifications and substitutions are all included in the scope defined by the claims of this application.
Claims
1. A single-stage electrolytic PFC-free lightning protection circuit, characterized in that: The invention comprises a rectifier module (10), a main circuit (20), a resistor R4, a resistor R5, an electrolytic capacitor EC2 and a diode D1, wherein the input end of the rectifier module (10) is connected to an external power supply, the output end of the rectifier module (10) is connected to the input end of the main circuit (20) and the anode of the diode D1, the cathode of the diode D1 is connected to one end of the resistor R4 and the positive electrode of the electrolytic capacitor EC2, the other end of the resistor R4 is connected to one end of the resistor R5, and the negative electrode of the electrolytic capacitor EC2 and the other end of the resistor R5 are connected to a GND end.
2. A single-stage electrolytic PFC-free lightning protection circuit according to claim 1, characterized in that: The main circuit (20) comprises an inductor L1, an electrolytic capacitor EC1, an electrolytic capacitor EC3, capacitors C3-C4, capacitors C1-C2, resistors R1-10, a MOS tube Q1, diodes D2-D4, a transformer T1 and a power chip U1, wherein a first end of the capacitor C1, a first end of the resistor R2 and a first end of the inductor L1 are connected to an output end of the rectifier module (10), a second end of the inductor L1 is connected to a second end of the resistor R2, a first end of the capacitor C2, a first end of the resistor R3, a first end of the capacitor C3, a first end of the resistor R1 and a first end of the transformer T1, a second end of the capacitor C3 is connected to a second end of the resistor R1 and a cathode of the diode D3, an anode of the diode D3 is connected to a second end of the transformer T1 and a drain of the MOS tube Q1, a second end of the resistor R3 is connected to a first end of the resistor R6, a positive electrode of the electrolytic capacitor EC3 and a first end of the power chip U1 The second end of the resistor R6 is connected to the cathode of the diode D4, the anode of the diode D4 is connected to the fifth end of the transformer T1 and the first end of the resistor R8, the second end of the resistor R8 is connected to the first end of the resistor R7 and the third end of the power chip U1, the resistor R9 is connected between the fourth end of the power chip U1 and the gate of the MOS tube Q1, the first end of the resistor R10 is connected to the sixth end of the power chip U1 and the source of the MOS tube Q1, the negative electrode of the electrolytic capacitor EC3, the second end of the resistor R10, the second end of the power chip U1, the sixth end of the transformer T1, the second end of the resistor R7, the second end of the capacitor C1, and the second end of the capacitor C2 are connected to the GND end, the anode of the diode D2 is connected to the third end of the transformer T1, the cathode of the diode D2 is connected to the positive electrode of the electrolytic capacitor EC1 and one end of the load, and the fourth end of the transformer T1 and the other end of the load are connected to the SGND end.
3. A single-stage electrolytic PFC-free lightning protection circuit according to claim 2, characterized in that: The capacitor C1 and the capacitor C2 are configured as CBB capacitors.
4. A single-stage electrolytic PFC-free lightning protection circuit according to claim 1, characterized in that: The rectifier module (10) is configured as a rectifier bridge BD 1.