Photovoltaic power generation anti-countercurrent protection circuit
By designing a photovoltaic power generation anti-reverse current protection circuit and using components such as diodes, transistors, and filter capacitors, the problem of grid instability after photovoltaic solar power generation is connected to the grid is solved, and the stability of the circuit and anti-reverse current protection are achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-17
- Publication Date
- 2026-04-07
AI Technical Summary
In the existing technology, the connection of photovoltaic solar power generation with the grid may cause instability in the grid and may generate reverse current that interferes with other equipment. Existing anti-reverse current diode solutions have the problem of abnormal circuit function.
A photovoltaic power generation anti-reverse current protection circuit was designed, which adopts a two-stage anti-reverse current and protection circuit, including diodes, transistors and filter capacitors, and is controlled by an anti-reverse current control chip to avoid the impact of reverse current on the mains power grid.
It effectively avoids the instability of the mains power grid after photovoltaic solar power generation is connected to the grid, and prevents crosstalk between power supply circuits, ensuring stable circuit function.
Smart Images
Figure CN224097411U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of photovoltaic power generation technology, and specifically to a photovoltaic power generation anti-reverse current protection circuit. Background Technology
[0002] In promoting green construction sites and achieving low-carbon transformation in the construction industry, the clean and efficient use of electricity supply has become an urgent issue. Currently, most construction site facilities, such as mixing plants, rely mainly on electricity supplied by the power grid for production operations. This traditional power supply method not only increases dependence on fossil fuels but also faces challenges such as tight power consumption and large fluctuations in peak and off-peak electricity prices, thus limiting the smooth progress of green construction site projects to some extent.
[0003] With the rapid development of renewable energy power generation technologies, distributed power generation systems such as solar photovoltaic and wind power are increasingly widely used around construction sites. Reverse current refers to the current generated by a solar power device that feeds surplus electricity into the mains power grid. Because it flows in the opposite direction to the mains power supply, it is called reverse current. During the use of new energy sources, the connection of photovoltaic solar power generation to the mains grid may cause instability in the mains power grid and may generate harmonics.
[0004] In the existing technology, power is mainly drawn from the stage after the power supply anti-reverse current diode to prevent current reverse flow. However, reverse current can flow to other circuits through the stage after the power supply anti-reverse current diode, causing interference current to other devices that draw power from the stage after the power supply anti-reverse current diode, thereby causing abnormal circuit function. Utility Model Content
[0005] The purpose of this utility model embodiment is to provide a photovoltaic power generation anti-reverse current protection circuit to solve the technical problems existing in the prior art.
[0006] To achieve the above objectives, this utility model provides a photovoltaic power generation anti-reverse current protection circuit, comprising:
[0007] The input terminal of the photovoltaic power generation anti-reverse current protection circuit is connected to the photovoltaic power generation terminal through a diode. One end of the diode is connected to the first Zener diode and the second transistor, and the other end is connected to one end of the first resistor. The other end of the first resistor is grounded. The base of the second transistor is connected to the second resistor and the third resistor. The other end of the third resistor is connected to the collector of the third transistor. The base of the third transistor is connected to the fourth resistor. The emitter of the third transistor is grounded. The collector of the fourth transistor is connected to the fourth resistor and the fifth resistor. The emitter of the fourth transistor is grounded. The base of the fourth transistor is connected to the sixth resistor. The sixth resistor is connected to the first resistor.
[0008] Optionally, the photovoltaic power generation anti-reverse current protection circuit includes a first filter capacitor, wherein one end of the first filter capacitor is connected to the base of the fourth transistor, and the other end is grounded.
[0009] Optionally, the photovoltaic power generation anti-reverse current protection circuit is provided with a second filter capacitor, wherein one end of the second filter capacitor is connected to the base of the second transistor, and the other end is connected to the emitter of the second transistor.
[0010] Optionally, the third and fourth transistors are NPN transistors, and the second transistor is a PNP transistor.
[0011] Optionally, the other end of the fifth resistor is connected to the anti-reverse current control chip.
[0012] Optionally, the anti-backflow control chip is an STM8L052R8.
[0013] By using the above technical solution and designing a two-stage anti-reverse current and protection circuit, crosstalk between various power supply circuits can be avoided, and the instability of the mains power grid caused by photovoltaic solar power generation and grid connection can be effectively avoided.
[0014] Other features and advantages of this utility model embodiment will be described in detail in the following detailed description section. Attached Figure Description
[0015] The accompanying drawings are provided to further illustrate the embodiments of the present invention and form part of the specification. They are used together with the following detailed description to explain the embodiments of the present invention, but do not constitute a limitation thereof. In the drawings:
[0016] Figure 1 This is a schematic diagram of a photovoltaic power generation anti-reverse current protection circuit provided in an embodiment of this utility model.
[0017] Explanation of reference numerals in the attached figures
[0018] D1, diode; Q1, first Zener diode;
[0019] Q2, the second transistor; Q3, the third transistor;
[0020] Q4, fourth transistor; R1, first resistor;
[0021] R2, the second resistor; R3, the third resistor;
[0022] R4, the fourth resistor; R5, the fifth resistor;
[0023] R6, the sixth resistor; C1, the first filter capacitor;
[0024] C2, the second filter capacitor. Detailed Implementation
[0025] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of the present invention.
[0026] See Figure 1 The diagram shown is a schematic of a photovoltaic power generation anti-reverse current protection circuit provided in an embodiment of this utility model, including:
[0027] The input terminal of the photovoltaic power generation anti-reverse current protection circuit is connected to the photovoltaic power generation terminal through diode D1. One end of diode D1 is connected to the first Zener diode Q1 and the second transistor Q2, and the other end is connected to one end of the first resistor R1. The other end of the first resistor R1 is grounded. The base of the second transistor Q2 is connected to the second resistor R2 and the third resistor R3. The other end of the third resistor R3 is connected to the collector of the third transistor Q3. The base of the third transistor Q3 is connected to the fourth resistor R4. The emitter of the third transistor Q3 is grounded. The collector of the fourth transistor is connected to the fourth resistor R4 and the fifth resistor R5. The emitter of the fourth transistor Q4 is grounded. The base of the fourth transistor Q4 is connected to the sixth resistor R6. The sixth resistor R6 is connected to the first resistor R1.
[0028] In some implementations, see Figure 1 As shown, the photovoltaic power generation anti-reverse current protection circuit is provided with a first filter capacitor C1, wherein one end of the first filter capacitor C1 is connected to the base of the fourth transistor Q4, and the other end is grounded.
[0029] In some implementations, see Figure 1 As shown, the photovoltaic power generation anti-reverse current protection circuit is provided with a second filter capacitor C2, wherein one end of the second filter capacitor C2 is connected to the base of the second transistor Q2, and the other end is connected to the emitter of the second transistor Q2.
[0030] Preferably, the third transistor Q3 and the fourth transistor Q4 are NPN transistors, and the second transistor Q2 is a PNP transistor.
[0031] In some implementations, the other end of the fifth resistor R5 is connected to the I / O port of the anti-reverse current control chip.
[0032] Preferably, the anti-backflow control chip is an STM8L052R8.
[0033] By using the above technical solution and designing a two-stage anti-reverse current and protection circuit, crosstalk between various power supply circuits can be avoided, and the instability of the mains power grid caused by photovoltaic solar power generation and grid connection can be effectively avoided.
[0034] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the specific details of the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the protection scope of the present invention.
[0035] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable way without contradiction. In order to avoid unnecessary repetition, this utility model will not describe the various possible combinations separately.
[0036] Furthermore, various different embodiments of this utility model can be combined in any way, as long as they do not violate the spirit of this utility model, they should also be regarded as the content disclosed by this utility model.
Claims
1. A photovoltaic power generation anti-reverse current protection circuit, characterized in that, include: The input terminal of the photovoltaic power generation anti-reverse current protection circuit is connected to the photovoltaic power generation terminal through a diode. One end of the diode is connected to the first Zener diode and the second transistor, and the other end is connected to one end of the first resistor. The other end of the first resistor is grounded. The base of the second transistor is connected to the second resistor and the third resistor. The other end of the third resistor is connected to the collector of the third transistor. The base of the third transistor is connected to the fourth resistor. The emitter of the third transistor is grounded. The collector of the fourth transistor is connected to the fourth resistor and the fifth resistor. The emitter of the fourth transistor is grounded. The base of the fourth transistor is connected to the sixth resistor. The sixth resistor is connected to the first resistor.
2. The photovoltaic power generation anti-reverse current protection circuit according to claim 1, characterized in that, The photovoltaic power generation anti-reverse current protection circuit is equipped with a first filter capacitor, wherein one end of the first filter capacitor is connected to the base of the fourth transistor, and the other end is grounded.
3. The photovoltaic power generation anti-reverse current protection circuit according to claim 1, characterized in that, The photovoltaic power generation anti-reverse current protection circuit is equipped with a second filter capacitor, wherein one end of the second filter capacitor is connected to the base of the second transistor, and the other end is connected to the emitter of the second transistor.
4. The photovoltaic power generation anti-reverse current protection circuit according to claim 1, characterized in that, The third and fourth transistors are NPN transistors, while the second transistor is a PNP transistor.
5. The photovoltaic power generation anti-reverse current protection circuit according to claim 1, characterized in that, The other end of the fifth resistor is connected to the anti-reverse current control chip.
6. The photovoltaic power generation anti-reverse current protection circuit according to claim 5, characterized in that, The anti-backflow control chip is model STM8L052R8.