Photovoltaic protection circuit and energy storage power supply

Abstract

The utility model relates to the technical field of energy storage power supplies, and mainly provides a photovoltaic protection circuit and an energy storage power supply, the circuit comprises a detection module, a control module and a relay RLY1; the control module is respectively connected with the detection module and a coil end of the relay RLY1, a contact group of the relay RLY1 is respectively connected with a photovoltaic input source and an energy storage power supply, the detection module is used for being connected with the photovoltaic input source, and the control module is used for receiving a driving signal. The detection module is used for detecting the input voltage of the photovoltaic input source so as to judge whether the photovoltaic input source is reversely connected or not according to the input voltage, and when the photovoltaic input source is reversely connected, a turn-off signal is output to the control module, so that the control module controls the relay RLY1 to be disconnected according to the turn-off signal, and therefore photovoltaic output is disconnected when the photovoltaic input source is reversely connected. And the energy storage power supply is protected. And when the turn-off signal is not received, the relay RLY1 is controlled to be closed according to the driving signal, so that the safety of the energy storage power supply is improved and the service life of the energy storage power supply is prolonged while photovoltaic power supply is not influenced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of energy storage power supply especially relates to a photovoltaic protection circuit and energy storage power supply.

BACKGROUND

[0002] With the importance of renewable energy utilization and the increase of outdoor activities, emergency power supply and other demands, traditional portable energy storage power supply has been widely used.

[0003] In the use process of portable energy storage power supply, the input circuit of energy storage power supply is connected with photovoltaic input source, thereby receiving and storing the input voltage of photovoltaic input source through the input circuit. However, when the positive and negative poles of photovoltaic input source are reversely connected with energy storage power supply, energy storage power supply has no any fault information prompt and action, which not only makes energy storage power supply have safety risk, but also reduces the service life of energy storage power supply.

UTILITARY MODEL CONTENT

[0004] The utility model embodiment provides a kind of photovoltaic protection circuit and energy storage power supply, to solve the technical problem of low safety and low service life caused by photovoltaic reverse connection in the prior art when charging energy storage power supply.

[0005] To solve the above technical problems, one technical scheme of the utility model embodiment is to provide a photovoltaic protection circuit, the photovoltaic protection circuit includes a detection module, a control module and a relay RLY1;

[0006] The detection module is connected with the control module, the control module is connected with the coil end of the relay RLY1, the contact group of the relay RLY1 is connected with photovoltaic input source and energy storage power supply respectively, the detection module is further used to be connected with the photovoltaic input source, and the control module is further used to receive driving signal;

[0007] The detection module is used to detect the input voltage of the photovoltaic input source, to judge whether the photovoltaic input source is reversely connected according to the input voltage, and output off signal to the control module when the photovoltaic input source is reversely connected;

[0008] The control module is used to control the relay RLY1 to be disconnected according to the off signal when receiving the off signal;And

[0009] When not receiving the off signal, the relay RLY1 is controlled to be attracted according to the driving signal.

[0010] Optionally, the detection module includes a detection unit and an isolation unit;

[0011] The detection unit is connected with the isolation unit, the isolation unit is connected with the control module, and the detection unit and the isolation unit are also used for connecting the photovoltaic input source.

[0012] The detection unit is used for detecting an input voltage of the photovoltaic input source to determine whether the photovoltaic input source is reversely connected, and outputting a control signal to the isolation unit when the photovoltaic input source is reversely connected, so that the isolation unit outputs an off signal to the control module.

[0013] Optionally, the detection unit comprises a resistor R3, a resistor R4 and a switch tube Q1.

[0014] The resistor R3 and the resistor R4 are connected in series, the resistor R3 and the resistor R4 are also connected with the positive electrode of the photovoltaic input source and the negative electrode of the photovoltaic input source respectively, the resistor R3 is also connected with the control end of the switch tube Q1, the first end of the switch tube Q1 is also connected with the isolation unit, and the second end of the switch tube Q1 is connected with the photovoltaic input source.

[0015] Optionally, the isolation unit comprises a switch tube Q2, a resistor R2, a resistor R11 and an optical coupler U1.

[0016] The control end of the switch tube Q2 is connected with the detection unit, the control end of the switch tube Q2 is also connected with the photovoltaic input source through the resistor R11, the first end of the switch tube Q2 is connected with the photovoltaic input source through the resistor R2, the second end of the switch tube Q2 is connected with the first input end of the optical coupler U1, the second input end of the optical coupler U1 is connected with the photovoltaic input source, the first output end of the optical coupler U1 is connected with the control module 22, and the second output end of the optical coupler U1 is used for grounding.

[0017] Optionally, the detection unit further comprises a diode D1.

[0018] The anode of the diode D1 is connected with the photovoltaic input source, and the cathode of the diode D1 is connected with the resistor R3.

[0019] Optionally, the detection module is also connected with a controller.

[0020] The detection module is also used for outputting the off signal to the controller to prompt the reverse connection alarm when the photovoltaic input source is reversely connected.

[0021] Optionally, the control module comprises a control unit and a voltage providing unit.

[0022] The control unit is connected with the detection module, the voltage providing unit is connected with the first power supply, the control unit is connected with the voltage providing unit, the control unit and the voltage providing unit are connected with the coil end of the relay RLY1 respectively, and the control unit is further used for receiving a driving signal.

[0023] The control unit is used for stopping working according to the off signal when the off signal is received, so that the relay RLY1 is disconnected.

[0024] When the off signal is not received, the control unit starts working according to the driving signal, so that the voltage providing unit supplies power to the coil end of the relay RLY1 based on the first power supply, and the relay RLY1 is attracted.

[0025] Optionally, the control unit comprises a resistor R7, a resistor R8, a switch tube Q3 and a diode D3.

[0026] The control end of the switch tube Q3 is connected with the detection module through the resistor R8, the control end of the switch tube Q3 is further connected with the second end of the switch tube Q3 through the resistor R7, the second end of the switch tube Q3 is used for grounding, the first end of the switch tube Q3 is connected with the anode of the diode D3 and the coil end of the relay RLY1 respectively, and the cathode of the diode D3 is further connected with the voltage providing unit.

[0027] Optionally, the voltage providing unit comprises a resistor R9, a diode D4 and a voltage stabilizing tube ZD3.

[0028] The anode of the diode D4 is connected with the first power supply through the resistor R9, the cathode of the diode D4 is connected with the anode of the voltage stabilizing tube ZD3 and the coil end of the relay RLY1 respectively, and the cathode of the voltage stabilizing tube ZD3 is connected with the control unit.

[0029] To solve the above technical problems, another technical scheme of the embodiment of the utility model is provided, which is a kind of energy storage power supply, and the energy storage power supply comprises:

[0030] A controller; and

[0031] The photovoltaic protection circuit as described above.

[0032] Different from the related art, the utility model provides a kind of photovoltaic protection circuit and energy storage power supply, the photovoltaic protection circuit includes detection module, control module and relay RLY1;The detection module is connected with the control module, the control module is connected with the coil end of the relay RLY1, the contact group of the relay RLY1 is connected with photovoltaic input source and energy storage power supply respectively, the detection module is also used to be connected with the photovoltaic input source, the control module is also used to receive driving signal.The detection module is used to detect the input voltage of the photovoltaic input source, to judge whether the photovoltaic input source is reversed according to the input voltage, and when the photovoltaic input source is reversed, output off signal to the control module, so that the control module controls the relay RLY1 to disconnect according to the off signal, to disconnect photovoltaic output when the photovoltaic input source is reversed, to protect the energy storage power supply in turn.And when not receiving the off signal, the relay RLY1 is controlled according to the driving signal and is attracted.Based on this, the safety and service life of energy storage power supply can be improved without affecting photovoltaic power supply. BRIEF DESCRIPTION OF DRAWINGS

[0033] One or more embodiments are illustrated by way of example in the accompanying drawings, which are not intended to be limiting of the embodiments, and which do not constitute a definition of all possible embodiments, and wherein like reference numerals refer to like elements in the various figures of the drawings, and wherein the figures of the drawings are not necessarily to scale, unless otherwise specifically noted.

[0034] Figure 1 is a schematic diagram of an application scenario provided by the utility model embodiment;

[0035] Figure 2 is a structural block diagram of the photovoltaic protection circuit provided by the utility model embodiment;

[0036] Figure 3 is a circuit diagram of the photovoltaic protection circuit provided by the utility model embodiment;

[0037] Figure 4 is the circuit diagram of control module provided by the utility model embodiment. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical scheme and advantages of the utility model more clearly, the following is combined with drawing and embodiment, and the utility model is further detailed.The specific embodiments described here are only used to explain the utility model, and are not used to limit the utility model.

[0039] The technical features involved in each embodiment of the present application described below do not constitute conflict and can be combined with each other.

[0040] When an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements can be present.

[0041] The terms "first", "second", and the like, in the description and in the claims of the utility model, are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be exchanged under appropriate circumstances, so that the embodiments of the application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. are usually a class, not limited to the number of objects, for example, the first object can be one or more.

[0042] Unless otherwise defined, all technical and scientific terms used in the specification are the same as those commonly understood by those skilled in the art to which the utility model belongs. The terms used in the specification of the utility model are only for the purpose of describing specific embodiments, and are not used to limit the utility model. The term "and / or" used in the specification includes any and all combinations of one or more related listed items.

[0043] Please refer to Figure 1 , Figure 1 is a schematic diagram of an application scenario provided by an embodiment of the utility model, as Figure 1 shown, the application scenario 1 includes a photovoltaic input source 100 and an energy storage power supply 200; the photovoltaic input source 100 is connected with the energy storage power supply 200. The photovoltaic input source 100 is used to receive solar energy, and convert the solar energy into electric energy, and finally input the electric energy to the energy storage power supply 200 to supply power for the energy storage power supply 200.

[0044] It should be noted that when the photovoltaic input source 100 supplies power for the energy storage power supply 200, there may be a reverse connection of the photovoltaic input source 100, at this time, if the photovoltaic input source 100 still supplies power for the energy storage power supply 200, it will cause damage to the energy storage power supply 200. Therefore, as Figure 1 shown, the energy storage power supply 200 includes a photovoltaic protection circuit 20, and the photovoltaic protection circuit 20 is connected with the photovoltaic input source 100. The photovoltaic protection circuit 20 is used to detect whether the photovoltaic input source 100 is reverse connected in real time, and disconnect the output of the photovoltaic input source 100 when the photovoltaic input source 100 is reverse connected, and prompt fault alarm, so as to protect the energy storage power supply 200 while improving the service life of the energy storage power supply 200.

[0045] In some embodiments, as Figure 1As shown, the energy storage power supply 200 further comprises a controller 10 connected with the photovoltaic protection circuit 20. When the photovoltaic protection circuit 20 detects reverse connection of the photovoltaic input source 100, a reverse connection signal is output to the controller 10 to prompt a fault alarm through the electric controller 10. When the photovoltaic protection circuit 20 works normally, a driving signal is output to the photovoltaic protection circuit 20 to make the photovoltaic protection circuit 20 transmit the input voltage of the photovoltaic input source 100 to the energy storage power supply 200.

[0046] Please refer to Figure 2 , Figure 2 is a structural block diagram of a photovoltaic protection circuit provided by the embodiment of the present application, as shown in the figure, Figure 2 The photovoltaic protection circuit 20 comprises a detection module 21, a control module 22 and a relay RLY1.

[0047] The detection module 21 is connected with the control module 22, the control module 22 is connected with the coil end of the relay RLY1, the contact group of the relay RLY1 is connected with the photovoltaic input source 100 and the energy storage power supply 200 respectively, the detection module 21 is further used to be connected with the photovoltaic input source 100, and the control module 22 is further used to receive a driving signal.

[0048] The detection module 21 is used to detect the input voltage of the photovoltaic input source 100 to judge whether the photovoltaic input source 100 is reversely connected according to the input voltage, and output a shutdown signal to the control module 22 when the photovoltaic input source 100 is reversely connected.

[0049] The control module 22 is used to control the relay RLY1 to be disconnected according to the shutdown signal when the shutdown signal is received; and

[0050] The control module 22 is used to control the relay RLY1 to be disconnected according to the shutdown signal when the shutdown signal is received; and

[0051] Specifically, the photovoltaic input source 100 is connected with the energy storage power supply 200 through the relay RLY1, and the relay RLY1 is in an open state in a static state. When the detection module 21 detects the input voltage of the photovoltaic input source 100, if the photovoltaic input source 100 is in a normal connection state, the detection module 21 will output a normal signal. At this time, the control module 22 will make the coil end of the relay RLY1 electrified according to the driving signal, so that the relay RLY1 is attracted. After the relay RLY1 is attracted, the input voltage of the photovoltaic input source 100 can be input to the energy storage power supply 200 through the relay RLY1. If the photovoltaic input source 100 is in a reverse connection state, the control module 22 will receive a shutdown signal. At this time, the control module 22 will stop working based on the shutdown signal, so that the relay RLY1 is in an open state, so that the photovoltaic input source 100 stops supplying power to the energy storage power supply 200, thereby improving the service life of the energy storage power supply 200.

[0052] In some embodiments, the detection module 21 is also connected with the controller 10. When the detection module 21 detects that the photovoltaic input source 100 is in reverse connection, the detection module 21 will also output a reverse connection signal to the controller 10 to prompt a reverse connection alarm through the controller 10, so as to prompt the user that the photovoltaic input source 100 is in reverse connection. Based on this, the safety of the energy storage power supply 200 can be improved.

[0053] In another embodiment, as shown in Figure 2 The detection module 21 includes a detection unit 211 and an isolation unit 212.

[0054] The detection unit 211 is connected with the isolation unit 212, and the isolation unit 212 is connected with the control module 22. The detection unit 211 and the isolation unit 212 are also used for connecting the photovoltaic input source 100.

[0055] The detection unit 211 is used for detecting the input voltage of the photovoltaic input source 100 to determine whether the photovoltaic input source 100 is in reverse connection, and outputting a control signal to the isolation unit 212 when the photovoltaic input source 100 is in reverse connection, so that the isolation unit 212 outputs a shutdown signal to the control module 22.

[0056] Specifically, when the photovoltaic input source 100 is connected with the photovoltaic protection circuit 20, the detection unit 211 detects the input voltage of the photovoltaic input source 100 in real time, and judges whether the input voltage is in the first state, if the input voltage is not in the first state, it is considered that the photovoltaic input source 100 is in the reverse connection state, so that the detection unit 211 outputs a control signal to the isolation unit 212, so that the isolation unit 212 outputs a shutdown signal to the control module 22 after isolating the control signal. If the input voltage is in the first state, it is considered that the photovoltaic input source 100 is connected normally, at this time, the detection unit 211 outputs a closing signal to the isolation unit 212, so that the isolation unit 212 outputs a normal signal according to the closing signal, so that the control module 22 works according to the driving signal. It can be known that the isolation unit 212 is mainly used for isolating input and output, and the control signal output by the detection unit 211 is isolated through the isolation unit 212, so as to avoid the interference in the control signal to make the output unstable, and thus improve the stability of detection.

[0057] In some embodiments, referring to Figure 3 , Figure 3 is a circuit diagram of a photovoltaic protection circuit provided by the embodiment of the utility model, as Figure 3 shown, the detection unit 211 includes resistance R3, resistance R4 and switch tube Q1;The isolation unit 212 includes switch tube Q2, resistance R2, resistance R11 and photo-coupler U1;

[0058] The resistance R3 and the resistance R4 are connected in series, the resistance R3 and resistance R4 are also connected with the positive pole of the photovoltaic input source 100 and the negative pole of the photovoltaic input source 100 respectively, the resistance R3 is also connected with the control end of the switch tube Q1, the first end of the switch tube Q1 is also connected with the isolation unit 212, and the second end of the switch tube Q1 is connected with the photovoltaic input source 100.

[0059] The control end of the switch tube Q2 is connected with the detection unit 211, the control end of the switch tube Q2 is also connected with the photovoltaic input source 100 through the resistance R11, the first end of the switch tube Q2 is connected with the photovoltaic input source 100 through the resistance R2, the second end of the switch tube Q2 is connected with the first input end of the photo-coupler U1, the second input end of the photo-coupler U1 is connected with the photovoltaic input source 100, the first output end of the photo-coupler U1 is connected with the control module 22, and the second output end of the photo-coupler U1 is used for grounding.

[0060] Specifically, when the photovoltaic input source 100 is connected with the photovoltaic protection circuit 20, the input voltage of the photovoltaic input source 100 is input into the resistors R3 and R4 to be divided by the resistors R3 and R4. After the resistors R3 and R4 divide the input voltage, the divided input voltage is input into the control end of the switch tube Q1. If the divided input voltage is not in the first state (i.e. output high level), it is considered that the photovoltaic input source 100 is in the reverse connection state. At this time, the switch tube Q1 is turned on according to the high level. After the switch tube Q1 is turned on, the input voltage flows into the ground through the resistor R11, so that the switch tube Q2 meets the turn-on condition and is turned on, thereby making the optocoupler U1 also turned on. After the optocoupler U1 is turned on, since the second output end of the optocoupler U1 is used for grounding, the first output end of the optocoupler U1 outputs a low level signal (off signal) to the control module 22, so that the control module 22 controls the relay RLY1 to be disconnected according to the off signal, thereby making the photovoltaic input source 100 stop supplying power to the energy storage power supply 200. If the divided input voltage is in the first state (i.e. output low level), it is considered that the photovoltaic input source 100 is in the normal connection state. At this time, the switch tube Q1 is in the cut-off state, the switch tube Q2 is also cut off, thereby making the optocoupler U1 also in the cut-off state, and further making the optocoupler U1 output a normal signal.

[0061] In yet another embodiment, as shown in Figure 3 The isolation unit 212 further includes a voltage stabilizing tube DS2, a cathode of the voltage stabilizing tube DS2 is connected with the first output end of the optocoupler U1, and an anode of the voltage stabilizing tube DS2 is connected with the controller 10. When the photovoltaic input source 100 is reversely connected, the off signal is input into the controller 10 through the voltage stabilizing tube DS2 to make the controller 10 prompt the reverse connection alarm. It should be noted that by introducing the voltage stabilizing tube DS2, it is prevented that the controller 10 is wrongly alarmed when the optocoupler U1 fluctuates. Based on this, the stability of the energy storage power supply 200 can be improved.

[0062] In some embodiments, as shown in Figure 3 The detection unit 211 further includes a diode D1.

[0063] An anode of the diode D1 is connected with the photovoltaic input source 100, and a cathode of the diode D1 is connected with the resistor R3.

[0064] It should be noted that when the photovoltaic input source 100 is normally connected to the energy storage power supply 200, the anode of the diode D1 is connected to the negative electrode of the photovoltaic input source 100, and the resistor R4 is connected to the positive electrode of the photovoltaic input source 100. Based on this, the positive electrode voltage of the photovoltaic input source 100 can be prevented from flowing into the negative electrode of the photovoltaic input source 100 through the resistor R4 and the resistor R3 through the diode D1.

[0065] In another embodiment, as shown in Figure 2 The control module 22 includes a control unit 221 and a voltage providing unit 222.

[0066] The control unit 221 is connected to the detection module 21, the voltage providing unit 222 is connected to a first power supply 51 (not shown in the figure), the control unit 221 is connected to the voltage providing unit 222, and the control unit 221 and the voltage providing unit 222 are respectively connected to the coil end of the relay RLY1. The control unit 221 is also used for receiving a driving signal.

[0067] The control unit 221 is configured to stop working according to the shutdown signal when the shutdown signal is received, so that the relay RLY1 is disconnected.

[0068] When the shutdown signal is not received, the control unit 221 starts working according to the driving signal, so that the voltage providing unit 222 supplies power to the coil end of the relay RLY1 based on the first power supply 51, so that the relay RLY1 is attracted.

[0069] Specifically, when the photovoltaic input source 100 is normally connected, the control unit 221 receives a driving signal and starts working according to the driving signal. At this time, the voltage of the first power supply 51 is input to the coil end of the relay RLY1 through the voltage providing unit 222, so that the coil end of the relay RLY1 has current flowing through, thereby causing the relay RLY1 to be attracted. When the photovoltaic input source 100 is reversely connected, the control unit 221 stops working based on the shutdown signal, so that the coil end of the relay RLY1 has no current flowing through, thereby causing the relay RLY1 to be disconnected, and the photovoltaic input source 100 stops supplying power to the energy storage power supply 200. The voltage of the first power supply 51 can be selected according to actual needs, which is mainly used to provide high voltage for the coil end of the relay RLY1. In some embodiments, the voltage of the first power supply 51 can be 12V.

[0070] In some embodiments, please refer to Figure 4 , Figure 4 is a circuit diagram of the control module provided in the embodiments of the utility model, asFigure 4 As shown, the control unit 221 comprises a resistor R7, a resistor R8, a switch tube Q8 and a diode D3; the voltage providing unit 222 comprises a resistor R9, a diode D4 and a voltage stabilizing tube ZD3;

[0071] The control end of the switch tube Q3 is connected with the detection module 21 through the resistor R8, and the control end of the switch tube Q3 is also connected with the second end of the switch tube Q3 through the resistor R7, the second end of the switch tube Q3 is used for grounding, the first end of the switch tube Q3 is connected with the anode of the diode D3 and the coil end of the relay RLY1 respectively, and the cathode of the diode D3 is also connected with the voltage providing unit 222.

[0072] The anode of the diode D4 is connected with the first power supply 51 through the resistor R9, the cathode of the diode D4 is connected with the anode of the voltage stabilizing tube ZD3 and the coil end of the relay RLY1 respectively, and the cathode of the voltage stabilizing tube ZD3 is connected with the control unit 221.

[0073] Specifically, when the detection module 21 outputs a normal signal, the switch tube Q3 will receive a driving signal through the resistor R8 and turn on according to the driving signal. When the switch tube Q3 is turned on, the anode of the diode D3 is connected with the grounding end; at the same time, the anode of the voltage stabilizing tube ZD3 will also receive the voltage output by the first power supply 51. Since the anode of the diode D3 and the anode of the voltage stabilizing tube ZD3 are connected with the two ends of the coil end of the relay RLY1 respectively, there will be a current flowing through the coil end of the relay RLY1. When there is a current flowing through the coil end of the relay RLY1, the relay RLY1 is in a closed state, thereby starting to transmit the input voltage of the photovoltaic input source 100. When the photovoltaic input source 100 is reversely connected, the switch tube Q3 will be cut off according to the off signal, and when the switch tube Q3 is cut off, the diode D3 is in a suspended state. At this time, even if the voltage of the first power supply 51 is input to the coil end of the relay RLY1, there is still no current on the coil of the relay RLY1, so the relay RLY1 is in an open state, thereby stopping the photovoltaic input source 100 from supplying power to the energy storage power supply 200.

[0074] The utility model discloses a photovoltaic protection circuit, the photovoltaic protection circuit includes detection module, control module and relay RLY1, the detection module with control module connects, control module with the coil end of relay RLY1 connects, the contact group of relay RLY1 is connected with photovoltaic input source and energy storage power supply respectively, the detection module is still used for with photovoltaic input source connects, control module is still used for receiving drive signal. The detection module is used to detect the input voltage of photovoltaic input source, to judge whether photovoltaic input source is reversed according to the input voltage, and when photovoltaic input source is reversed, output off signal to control module, so that control module controls relay RLY1 according to off signal and disconnects, thereby realizes when photovoltaic input source and disconnects photovoltaic output, and then protects energy storage power supply. When not receiving off signal, according to drive signal control relay RLY1 and attract. Based on this, it can improve the security and service life of energy storage power supply without affecting photovoltaic power supply.

[0075] Finally, it should be noted that: the above examples are used to illustrate the technical solutions of the utility model, but not to limit them; under the idea of the utility model, the technical features in the above examples or different examples can also be combined, the steps can be implemented in any order, and there are many other changes of different aspects of the utility model as described above, which are not provided in details for simplicity; although the utility model has been described in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement to part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the application.

Claims

1. A photovoltaic protection circuit, characterized in that, The photovoltaic protection circuit comprises a detection module, a control module and a relay RLY1; The detection module is connected with the control module, the control module is connected with the coil end of the relay RLY1, the contact group of the relay RLY1 is connected with a photovoltaic input source and an energy storage power supply respectively, the detection module is further connected with the photovoltaic input source, and the control module is further used for receiving a driving signal; The detection module is used for detecting the input voltage of the photovoltaic input source, judging whether the photovoltaic input source is reversely connected according to the input voltage, and outputting an off signal to the control module when the photovoltaic input source is reversely connected; The control module is used for controlling the relay RLY1 to be disconnected according to the off signal when the off signal is received. And controlling the relay RLY1 to be attracted according to the driving signal when the off signal is not received.

2. The photovoltaic protection circuit of claim 1, wherein, The detection module comprises a detection unit and an isolation unit; The detection unit is connected with the isolation unit, the isolation unit is connected with the control module, and the detection unit and the isolation unit are both used for connecting the photovoltaic input source; The detection unit is used for detecting the input voltage of the photovoltaic input source, judging whether the photovoltaic input source is reversely connected, and outputting a control signal to the isolation unit when the photovoltaic input source is reversely connected, so that the isolation unit outputs an off signal to the control module.

3. The photovoltaic protection circuit of claim 2, wherein, The detection unit comprises a resistor R3, a resistor R4 and a switch tube Q1; The resistor R3 is connected with the resistor R4 in series, the resistor R3 and the resistor R4 are further connected with the positive electrode of the photovoltaic input source and the negative electrode of the photovoltaic input source respectively, the resistor R3 is further connected with the control end of the switch tube Q1, the first end of the switch tube Q1 is further connected with the isolation unit, and the second end of the switch tube Q1 is connected with the photovoltaic input source.

4. The photovoltaic protection circuit of claim 2, wherein, The isolation unit comprises a switch tube Q2, a resistor R2, a resistor R11 and an optical coupler U1; The control end of the switch tube Q2 is connected with the detection unit, the control end of the switch tube Q2 is further connected with the photovoltaic input source through the resistor R11, the first end of the switch tube Q2 is connected with the photovoltaic input source through the resistor R2, the second end of the switch tube Q2 is connected with the first input end of the optical coupler U1, the second input end of the optical coupler U1 is connected with the photovoltaic input source, the first output end of the optical coupler U1 is connected with the control module 22, and the second output end of the optical coupler U1 is used for grounding.

5. The photovoltaic protection circuit of claim 3, wherein, The detection unit further comprises a diode D1; The anode of the diode D1 is connected with the photovoltaic input source, and the cathode of the diode D1 is connected with the resistor R3.

6. Photovoltaic protection circuit according to any of claims 1-5, characterized in that, The detection module is further connected with a controller; The detection module is further used for outputting the off signal to the controller to prompt the reverse connection alarm when the photovoltaic input source is reversely connected.

7. The photovoltaic protection circuit of claim 1, wherein, The control module comprises a control unit and a voltage providing unit; The control unit is connected with the detection module, the voltage providing unit is connected with the first power supply, the control unit is connected with the voltage providing unit, the control unit and the voltage providing unit are respectively connected with the coil end of the relay RLY1, and the control unit is further used for receiving a driving signal. The control unit is used for stopping working according to the off signal when the off signal is received, so that the relay RLY1 is disconnected. And When the off signal is not received, the control unit starts working according to the driving signal, so that the voltage providing unit supplies power to the coil end of the relay RLY1 based on the first power supply, and the relay RLY1 is attracted.

8. The photovoltaic protection circuit of claim 7, wherein, The control unit comprises a resistor R7, a resistor R8, a switch tube Q3 and a diode D3. The control end of the switch tube Q3 is connected with the detection module through the resistor R8, the control end of the switch tube Q3 is further connected with the second end of the switch tube Q3 through the resistor R7, the second end of the switch tube Q3 is used for grounding, the first end of the switch tube Q3 is connected with the anode of the diode D3 and the coil end of the relay RLY1 respectively, and the cathode of the diode D3 is further connected with the voltage providing unit.

9. The photovoltaic protection circuit of claim 7, wherein, The voltage providing unit comprises a resistor R9, a diode D4 and a voltage stabilizing tube ZD3. The anode of the diode D4 is connected with the first power supply through the resistor R9, the cathode of the diode D4 is connected with the anode of the voltage stabilizing tube ZD3 and the coil end of the relay RLY1 respectively, and the cathode of the voltage stabilizing tube ZD3 is connected with the control unit.

10. An energy storage power supply, characterized by, The energy storage power supply comprises: a controller; and The photovoltaic protection circuit according to any one of claims 1-9. The photovoltaic protection circuit according to any one of claims 1-9.

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