CN220673377U - Voltage stabilizing protection circuit and photovoltaic system - Google Patents
Voltage stabilizing protection circuit and photovoltaic system Download PDFInfo
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- CN220673377U CN220673377U CN202322059118.9U CN202322059118U CN220673377U CN 220673377 U CN220673377 U CN 220673377U CN 202322059118 U CN202322059118 U CN 202322059118U CN 220673377 U CN220673377 U CN 220673377U
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- 230000000087 stabilizing effect Effects 0.000 title claims abstract description 77
- 239000003990 capacitor Substances 0.000 claims description 19
- 238000010586 diagram Methods 0.000 description 8
- 238000004146 energy storage Methods 0.000 description 7
- 230000002265 prevention Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Abstract
The application provides a voltage stabilizing protection circuit and a photovoltaic system, wherein the voltage stabilizing protection circuit is connected between a solar panel and a rear-stage circuit and comprises a voltage stabilizing circuit and a protection circuit, the voltage stabilizing circuit comprises a first resistor and a voltage stabilizing diode, and the first resistor and the voltage stabilizing diode are connected between the solar panel and a public ground in series; the protection circuit comprises a first switch circuit and a second switch circuit; the first control end of the first switch circuit is connected with the midpoint of the voltage stabilizing circuit, the first input end of the first switch circuit is connected with the solar panel, the first output end of the first switch circuit is connected with the second control end of the second switch circuit, the first input end of the second switch circuit is connected with the solar panel, and the second output end of the second switch circuit is connected with the rear-stage circuit. The input voltage of the solar panel is stabilized in a bearable range of the post-stage circuit through the voltage stabilizing diode, and the solar panel is isolated from the post-stage circuit when the input voltage exceeds a threshold value, so that the post-stage circuit is prevented from burning out a chip, and the stable operation of the photovoltaic system is realized.
Description
Technical Field
The application relates to the field of outdoor power supplies, and more particularly relates to a voltage stabilizing protection circuit and a photovoltaic system.
Background
When the solar panel is used for supplying power, due to weather reasons (such as different air temperature and different illumination intensity), the fluctuation range of the power supply voltage is easy to be large, and if the power supply voltage is directly supplied to a rear-stage circuit, the chip can be damaged. In the prior art, a DC-DC conversion circuit is generally used in this case, but the cost of circuit hardware is increased, and the interference source of the circuit board is increased.
Disclosure of Invention
Accordingly, it is necessary to provide a voltage stabilizing protection circuit and a photovoltaic system to solve at least the problems of high hardware cost and increased interference source caused by the DC-DC conversion circuit in the prior art.
The application provides a voltage stabilizing protection circuit which is connected between a solar panel and a post-stage circuit, and is characterized in that the circuit comprises a voltage stabilizing circuit and a protection circuit; the voltage stabilizing circuit comprises a first resistor and a voltage stabilizing diode, and the first resistor and the voltage stabilizing diode are connected in series between the solar panel and the public ground; the protection circuit comprises a first switch circuit and a second switch circuit; the solar panel is characterized in that a first control end of the first switch circuit is connected with the midpoint of the voltage stabilizing circuit, a first input end of the first switch circuit is connected with the solar panel, a first output end of the first switch circuit is connected with a second control end of the second switch circuit, a first input end of the second switch circuit is connected with the solar panel, and a second output end of the second switch circuit is connected with the rear-stage circuit.
In an embodiment, the first switch circuit includes a first triode and a second resistor, the second resistor is connected between a collector of the first triode and the solar panel, the collector of the first triode is connected with the solar panel, a base of the first triode is connected to a midpoint of the voltage stabilizing circuit, and an emitter of the first triode is connected to a second control end of the second switch circuit.
In an embodiment, the second switching circuit includes a second triode, a base stage of the second triode is connected to an emitter of the first triode, a collector of the second triode is connected to the solar panel, and an emitter of the second triode is connected to the back stage circuit.
In an embodiment, the first transistor and the second transistor are NPN transistors.
In an embodiment, the voltage stabilizing protection circuit further comprises a backflow prevention circuit, wherein the input end of the backflow prevention circuit is connected with the solar panel, and the output end of the backflow prevention circuit is connected with the input end of the voltage stabilizing circuit.
In an embodiment, the anti-backflow circuit includes a first diode, a positive electrode of the first diode is connected to the solar panel, and a negative electrode of the first diode is connected to an input end of the voltage stabilizing circuit.
In an embodiment, the voltage stabilizing protection circuit further includes an energy storage circuit, an input end of the energy storage circuit is connected to the second output end of the second switch circuit, and an output end of the energy storage circuit is connected to the post-stage circuit.
In an embodiment, the tank circuit comprises a first capacitor connected between the second output of the second switching circuit and the common ground.
In an embodiment, the tank circuit includes a second capacitor connected between the back-end circuit and the common ground.
In a second aspect, a photovoltaic system provided in an embodiment of the present application includes a solar panel, a voltage stabilizing protection circuit as described in the first aspect, and a post-stage circuit, where an input end of the voltage stabilizing protection circuit is connected to the solar panel, and an output end of the voltage stabilizing protection circuit is connected to the post-stage circuit.
The utility model has the beneficial effects that: the input voltage of the solar panel which is too high is stabilized in a voltage range which can be born by the rear-stage circuit through the voltage stabilizing diode without using a control unit, and when the input voltage is too high to be reduced, the voltage stabilizing protection circuit is disconnected to isolate the solar panel from the rear-stage circuit, so that the chip is prevented from being burnt out due to the too high voltage of the rear-stage circuit, the stable work of the photovoltaic system is realized, and the hardware resources are saved.
Drawings
FIG. 1 is a block diagram of a voltage stabilizing circuit according to an embodiment of the present disclosure;
FIG. 2 is a circuit diagram of a protection circuit according to an embodiment of the present disclosure;
FIG. 3 is a block diagram of an anti-backflow circuit according to an embodiment of the present disclosure;
FIG. 4 is a circuit diagram of an anti-backflow circuit according to an embodiment of the present disclosure;
FIG. 5 is a block diagram of a tank circuit according to an embodiment of the present disclosure;
FIG. 6 is a circuit diagram of a tank circuit according to an embodiment of the present disclosure;
fig. 7 is a circuit diagram of a voltage stabilizing protection circuit provided in an exemplary embodiment of the present application;
fig. 8 is a block diagram of a photovoltaic system according to an embodiment of the present disclosure.
Detailed Description
In order to facilitate an understanding of the present application, a more complete description of the present application will now be provided with reference to the relevant figures. Examples of the present application are given in the accompanying drawings. This application may, however, be embodied in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete. It will be apparent to those skilled in the art from this disclosure that the present application may be applied to other similar situations without undue burden from these figures. Moreover, it should be appreciated that while such a development effort might be complex and lengthy, it would nevertheless be a routine undertaking of design, fabrication, or manufacture for those of ordinary skill having the benefit of this disclosure, and thus should not be construed as having the benefit of this disclosure.
Unless defined otherwise, 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 herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
It will be understood that the terms "first," "second," and the like, as used herein, may be used to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another element. For example, a first resistance may be referred to as a second resistance, and similarly, a second resistance may be referred to as a first resistance, without departing from the scope of the present application. Both the first resistor and the second resistor are resistors, but they are not the same resistor. It is understood that "at least one" means one or more and "a plurality" means two or more. "at least part of an element" means part or all of the element. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," and/or the like, specify the presence of stated features, integers, steps, operations, elements, components, or groups thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or groups thereof. Also, the term "and/or" as used in this specification includes any and all combinations of the associated listed items.
In the application, as shown in fig. 1, a voltage stabilizing protection circuit is provided, and is connected between a solar panel and a post-stage circuit, and comprises a voltage stabilizing circuit 11 and a protection circuit 12, wherein the voltage stabilizing circuit 11 comprises a first resistor R1 and a voltage stabilizing diode ZD1, and the first resistor R1 and the voltage stabilizing diode ZD1 are connected in series between the solar panel and a public ground; the protection circuit 12 includes a first switch circuit 20, a second switch circuit 21; the first control end a of the first switch circuit 20 is connected to the midpoint of the voltage stabilizing circuit 11, the first input end b of the first switch circuit 20 is connected to the solar panel, the first output end c of the first switch circuit is connected to the second control end a ' of the second switch circuit 21, the first input end b ' of the second switch circuit 21 is connected to the solar panel, and the second output end c ' of the second switch circuit 21 is connected to the post-stage circuit.
The solar panel can be used as a power supply device for supplying power to various electric equipment, and the rear-stage circuit comprises, but is not limited to, related circuits of various power consumption devices.
In the present embodiment, the voltage stabilizing circuit 11 includes a first resistor R1 and a voltage stabilizing diode ZD1, and the first resistor R1 and the voltage stabilizing diode ZD1 are connected in series between the solar panel and the common ground. The protection circuit 12 includes a first switch circuit 20 and a second switch circuit 21. When the input voltage Vin of the solar panel is smaller than the voltage stabilizing value of the zener diode, the zener diode ZD1 does not work, and the input voltage passes through the protection circuit 12 and outputs Vout to a later-stage circuit; when the input voltage Vin is larger than the voltage stabilizing value of the voltage stabilizing diode ZD1 and is smaller than the voltage stabilizing threshold, the voltage stabilizing diode ZD1 controls the voltage value of the input voltage to be kept at the voltage stabilizing value, and the voltage after voltage stabilization is output to a post-stage circuit through the protection circuit output Vout; when the input voltage is greater than the voltage stabilizing threshold of the zener diode ZD1, the zener diode ZD1 is broken down and is communicated with the public ground, at this time, the voltage of the first control end a of the first switch circuit 20 in the protection circuit is 0, the first switch circuit 20 is not conducted, the voltage of the second control end a' of the second switch circuit 21 is influenced by the first switch circuit 20 to be 0, and the second switch circuit is also not conducted, so that the rear-stage circuit is disconnected, voltage stabilization between the solar panel and the rear-stage circuit is realized, and the rear-stage circuit is protected.
In one embodiment, as shown in fig. 2, the first switching circuit 20 includes a first triode Q1 and a second resistor R2, the second resistor R2 is connected between the collector of the first triode Q1 and the solar panel, the collector of the first triode Q1 is connected with the solar panel, the base of the first triode Q1 is connected at the midpoint of the voltage stabilizing circuit 11, and the emitter of the first triode Q1 is connected at the second control terminal a' of the second switching circuit 21.
The second switch circuit 21 includes a second triode Q2, a base stage of the second triode Q2 is connected to an emitter of the first triode Q1, a collector of the second triode Q2 is connected to the solar panel, and an emitter of the second triode Q2 is connected to the rear stage circuit.
Specifically, the first triode Q1 and the second triode Q2 are NPN type triodes.
In one embodiment, as shown in fig. 3, the voltage stabilizing protection circuit further includes a backflow preventing circuit 13, an input end of the backflow preventing circuit 13 is connected to the solar panel, and an output end of the backflow preventing circuit 13 is connected to an input end of the voltage stabilizing circuit 11.
Specifically, as shown in fig. 4, the anti-backflow circuit 13 includes a first diode D1, wherein an anode of the first diode D1 is connected to the solar panel, and a cathode of the first diode D1 is connected to the input terminal of the voltage stabilizing circuit 11. The first diode D1 may be a schottky diode to prevent the backward voltage generated from the backward circuit.
In one embodiment, as shown in fig. 5, the voltage stabilizing protection circuit further includes a tank circuit 14, an input terminal of the tank circuit 14 is connected to the second output terminal of the second switch circuit 21, and an output terminal of the tank circuit 14 is connected to the post-stage circuit.
Specifically, as shown in fig. 6, the tank circuit 14 includes a first capacitor C1, and the first capacitor C1 is connected between the second output terminal C' of the second switch circuit 21 and the common ground. The tank circuit 14 includes a second capacitor C2, and the second capacitor C2 is connected between the back-stage circuit and the common ground. The current of the voltage stabilizing protection circuit is limited through the first capacitor C1 and the second capacitor C2, and the first capacitor C1 and the second capacitor C2 can serve as a rear-stage capacitor to play roles in energy storage and filtering.
In one example embodiment, as shown in fig. 7, the voltage stabilizing protection circuit includes a first diode D1, a first resistor R1, a voltage stabilizing diode ZD1, a second resistor R2, a first transistor Q1, a second transistor Q2, a first capacitor C1, and a second capacitor C2. The voltage stabilizing value of the voltage stabilizing diode ZD1 is 15V, the resistance value of the first resistor R1 is 20K, the resistance value of the second resistor R2 is 1K, the capacitance value of the first capacitor C1 is 0.1uF, and the capacitance value of the second capacitor C2 is 22uF.
The first resistor R1 and the zener diode ZD1 are connected in series between the solar panel and the common ground to form a voltage stabilizing circuit. The base of the first triode Q1 is connected between the first resistor R1 and the zener diode ZD1, the collector is connected with the second resistor R2 and then is connected with the solar panel, and the emitter is connected with the base of the second triode Q2. The first capacitor C1 and the second capacitor C2 are connected in parallel to form an energy storage circuit. The collector of the second triode Q2 is connected with the solar panel, and the emitter is connected with the input end of the energy storage circuit. The output end of the energy storage circuit is connected with the post-stage circuit.
When the solar panel generates voltage, vin has voltage input, and passes through the first diode D1, the first resistor R1 and the second resistor R2. If the input voltage Vin is less than 15V, the zener diode ZD1 is not operated, the voltage at the second point is greater than 0, the first transistor Q1 is turned on, the voltage input at the base stage of the second transistor Q2 is also turned on, the voltage at the first point is approximately equal to the input voltage Vin, and the output voltage Vout is approximately equal to the voltage at the first point. If the input voltage Vin is greater than 15V and less than 50V, the zener diode ZD1 controls the voltage value of the input voltage Vin to be kept around 15V, the voltage at the point one is stabilized at 15V, and the output voltage Vout is approximately equal to the voltage at the point one. If the input voltage Vin is greater than 50V, the zener diode ZD1 is broken down and connected to the common ground, the voltage of the point location two (the base level of the first triode Q1) is 0, the first triode Q1 is not conducted, the base level voltage of the second triode Q1 is 0, and the second triode Q1 is not conducted, so that the output voltage Vout is disconnected from the stability protection circuit, and the subsequent circuit is protected.
On the basis of the above implementation manners, the embodiment of the disclosure further provides a photovoltaic system, as shown in fig. 8, where the photovoltaic system includes a solar panel, any one of the voltage stabilizing protection circuits in the above implementation manners, and a post-stage circuit, an input end of the voltage stabilizing protection circuit is connected to the solar panel, and an output end of the voltage stabilizing protection circuit is connected to the post-stage circuit.
In the description of the present specification, reference to the description of the terms "one embodiment," "the above embodiment," and the like, means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic descriptions of the above terms do not necessarily refer to the same embodiment or example.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples only represent a few embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the present application. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. Accordingly, the scope of protection of the present application shall be subject to the appended claims.
Claims (10)
1. The voltage stabilizing protection circuit is connected between the solar panel and the post-stage circuit and is characterized by comprising a voltage stabilizing circuit and a protection circuit;
the voltage stabilizing circuit comprises a first resistor and a voltage stabilizing diode, and the first resistor and the voltage stabilizing diode are connected in series between the solar panel and the public ground;
the protection circuit comprises a first switch circuit and a second switch circuit; the solar panel is characterized in that a first control end of the first switch circuit is connected with the midpoint of the voltage stabilizing circuit, a first input end of the first switch circuit is connected with the solar panel, a first output end of the first switch circuit is connected with a second control end of the second switch circuit, a first input end of the second switch circuit is connected with the solar panel, and a second output end of the second switch circuit is connected with the rear-stage circuit.
2. The voltage stabilizing protection circuit according to claim 1, wherein the first switching circuit comprises a first triode and a second resistor, the second resistor is connected between a collector of the first triode and the solar panel, the collector of the first triode is connected with the solar panel, a base of the first triode is connected to a midpoint of the voltage stabilizing circuit, and an emitter of the first triode is connected to a second control terminal of the second switching circuit.
3. The voltage stabilizing protection circuit according to claim 2, wherein the second switching circuit comprises a second triode, a base stage of the second triode is connected with an emitter of the first triode, a collector of the second triode is connected with the solar panel, and an emitter of the second triode is connected with the back stage circuit.
4. The voltage regulator protection circuit of claim 3, wherein the first transistor and the second transistor are NPN transistors.
5. The voltage stabilizing and protecting circuit according to claim 1, further comprising a backflow preventing circuit, wherein an input end of the backflow preventing circuit is connected to the solar panel, and an output end of the backflow preventing circuit is connected to an input end of the voltage stabilizing circuit.
6. The voltage stabilizing and protecting circuit according to claim 5, wherein the anti-backflow circuit comprises a first diode, wherein a positive electrode of the first diode is connected with the solar panel, and a negative electrode of the first diode is connected with an input end of the voltage stabilizing circuit.
7. The voltage stabilizing protection circuit according to claim 1, further comprising a tank circuit, wherein an input of the tank circuit is connected to the second output of the second switch circuit, and an output of the tank circuit is connected to the subsequent circuit.
8. The voltage regulator protection circuit of claim 7, wherein the tank circuit comprises a first capacitor connected between the second output of the second switching circuit and the common ground.
9. The voltage regulator protection circuit of claim 8, wherein the tank circuit includes a second capacitor connected between the back-end circuit and the common ground.
10. A photovoltaic system, comprising a solar panel, the voltage stabilizing protection circuit according to any one of claims 1 to 9, and a post-stage circuit, wherein an input end of the voltage stabilizing protection circuit is connected to the solar panel, and an output end of the voltage stabilizing protection circuit is connected to the post-stage circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322059118.9U CN220673377U (en) | 2023-08-02 | 2023-08-02 | Voltage stabilizing protection circuit and photovoltaic system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322059118.9U CN220673377U (en) | 2023-08-02 | 2023-08-02 | Voltage stabilizing protection circuit and photovoltaic system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220673377U true CN220673377U (en) | 2024-03-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322059118.9U Active CN220673377U (en) | 2023-08-02 | 2023-08-02 | Voltage stabilizing protection circuit and photovoltaic system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220673377U (en) |
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2023
- 2023-08-02 CN CN202322059118.9U patent/CN220673377U/en active Active
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