PN board switching circuit of solar panel PID effect repairing circuit

Abstract

The utility model belongs to the technical field of photovoltaic power generation, and particularly discloses a PN board switching circuit of a solar panel PID effect repairing circuit, which comprises a PID repairing circuit connected with a solar panel, and the solar panel comprises a P-type photovoltaic panel and an N-type photovoltaic panel. An anti-reverse circuit and a PN plate selection circuit are arranged between the solar panel and the PID repair circuit, and the PN plate selection circuit is further connected with a controller used for controlling the PN plate selection circuit; when PID effect repairing is carried out, the PN plate selection circuit enables the PID repairing circuit and the solar panel to be connected, and the anti-reverse circuit is used for preventing the solar panel from being short-circuited and preventing reverse conduction. According to the utility model, the PN plate selection circuit is arranged between the solar panel and the PID repair circuit, and the PN plate selection circuit is controlled by the controller, so that during PID repair, a P-type photovoltaic panel or an N-type photovoltaic panel can be selected as required for PID repair, and the flexibility and accuracy of PID repair are improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of photovoltaic power generation, and particularly relates to a PN board switching circuit of a solar panel PID effect repair circuit. Background Art

[0002] The PID effect of solar panels refers to the performance degradation of photovoltaic modules caused by potential induction. PID is a common problem of photovoltaic modules exposed to high temperature and high humidity for a long time, which will cause the power output of the modules to decrease or even fail, seriously affecting the operating efficiency of the photovoltaic power generation system. In order to solve the PID problem, a PID repair circuit is set at the positive and negative poles of the solar panel.

[0003] Traditional PID repair circuits can only repair P-type photovoltaic modules or N-type photovoltaic modules by raising or lowering the voltage between the photovoltaic panels and the ground. That is, under the same working conditions, it is impossible to simultaneously meet the PID repair requirements of P-type photovoltaic modules and N-type photovoltaic modules. However, in actual production, both modules need PID repair. Utility Model Content

[0004] The purpose of the utility model is to overcome the defect in the prior art that the PID repair of P-type photovoltaic modules and N-type photovoltaic modules cannot be taken into account at the same time, and to provide a PN panel switching circuit of a solar panel PID effect repair circuit.

[0005] The utility model provides a PN panel switching circuit of a solar panel PID effect repair circuit, comprising a PID repair circuit connected to a solar panel, wherein the solar panel comprises a P-type photovoltaic panel and an N-type photovoltaic panel; an anti-reverse circuit and a PN panel selection circuit are arranged between the solar panel and the PID repair circuit, and the PN panel selection circuit is further connected to a controller for controlling the PN panel selection circuit;

[0006] When repairing the PID effect, the PN panel selection circuit conducts the PID repair circuit with the solar panel, and the anti-reverse circuit is used to prevent the solar panel from short-circuiting and reverse conduction.

[0007] A further solution is that the PN panel selection circuit includes a relay K1, a relay K2, a relay K3, and a relay K4 arranged between the solar panel and the PID repair circuit;

[0008] The relay K1 and the relay K4 are respectively connected to the solar panel in parallel, and the relay K2 and the relay K3 are respectively connected to the PE terminal.

[0009] A further solution is that the anti-reverse circuit includes a diode D1, a diode D2, a diode D3, and a diode D4;

[0010] The diode D1 and the diode D2 are connected in parallel with the relay K1, and the diode D1 is connected to the positive electrode of the solar panel, and the diode D2 is connected to the negative electrode of the solar panel;

[0011] The diode D3 and the diode D4 are connected in parallel with the relay K4 , and the diode D3 is connected to the positive electrode of the solar panel, and the diode D4 is connected to the negative electrode of the solar panel.

[0012] A further solution is that the unidirectional conduction direction of the diode D1 and the diode D2 is from the circuit breaker K1 to the solar panel;

[0013] The unidirectional conduction direction of the diode D3 and the diode D4 is from the solar panel to the circuit breaker K4.

[0014] A further solution is that the controller is signal-connected to the relay K1 , the relay K2 , the relay K3 , and the relay K4 , respectively.

[0015] A further solution is that a current limiting resistor R1 is also connected in series on the line between the PE terminal and the relay K2 and the relay K3.

[0016] Compared with the prior art, the beneficial effect of the utility model is that: the utility model sets a PN panel selection circuit between the solar panel and the PID repair circuit, and the PN panel selection circuit is controlled by a controller. When performing PID repair, a P-type photovoltaic panel or an N-type photovoltaic panel can be selected for PID repair as needed, thereby improving the flexibility and accuracy of PID repair.

[0017] The utility model also arranges an anti-reverse circuit composed of 4 diodes between the solar panel and the PN panel selection circuit, which can effectively prevent the solar panel from short-circuiting and reverse conduction, and avoid voltage backflow when performing PID repair. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The following drawings are only used to illustrate and explain the present invention, and are not intended to limit the scope of the present invention, wherein:

[0019] Figure 1 : Schematic diagram of the connection structure of the utility model;

[0020] Figure 2 : Schematic diagram of circuit connection of the utility model;

[0021] In the figure: 10, solar panel; 20, anti-reverse circuit; 30, PN board selection circuit; 40, PID repair circuit; 50, controller; 60, PE terminal. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution, design method and advantages of the utility model clearer, the utility model is further described in detail through specific embodiments in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0023] like Figure 1 As shown, the utility model provides a PN panel switching circuit of a solar panel PID effect repair circuit, including a PID repair circuit 40 connected to a solar panel 10, wherein the solar panel 10 includes a P-type photovoltaic panel and an N-type photovoltaic panel; an anti-reverse circuit 20 and a PN panel selection circuit 30 are provided between the solar panel 10 and the PID repair circuit 40, and the PN panel selection circuit 30 is also connected to a controller 50 for controlling the PN panel selection circuit 30; when performing PID effect repair, the PN panel selection circuit 30 conducts the PID repair circuit 40 with the solar panel 10, and the anti-reverse circuit 20 is used to prevent the solar panel 10 from short-circuiting and reverse conduction. Specifically, as Figure 2 As shown, the PN panel selection circuit 30 includes a relay K1, a relay K2, a relay K3, and a relay K4 arranged between the solar panel 10 and the PID repair circuit 40; the relay K1 and the relay K4 are respectively connected in parallel with the solar panel 10, and the relay K2 and the relay K3 are respectively connected to the PE terminal 60. The anti-reverse circuit 20 includes a diode D1, a diode D2, a diode D3, and a diode D4; the diode D1 and the diode D2 are connected in parallel with the relay K1, and the diode D1 is connected to the positive electrode of the solar panel 10, and the diode D2 is connected to the negative electrode of the solar panel 10; the diode D3 and the diode D4 are connected in parallel with the relay K4, and the diode D3 is connected to the positive electrode of the solar panel 10, and the diode D4 is connected to the negative electrode of the solar panel 10. The controller 50 is respectively connected to the relay K1, the relay K2, the relay K3, and the relay K4 signal, and the circuit between the PE terminal 60 and the relay K2 and the relay K3 is also connected in series with a current limiting resistor R1.

[0024] In the above, the unidirectional conduction direction of the diodes D1 and D2 is from the circuit breaker K1 to the solar panel 10 ; the unidirectional conduction direction of the diodes D3 and D4 is from the solar panel 10 to the circuit breaker K4 .

[0025] Before the PID repair circuit 40 is initialized and powered on, the installer will determine the type of component based on the actual installation of the photovoltaic components on site, and input the component type in the APP or system host computer. When the PID repair circuit 40 needs to work, the controller 50 issues a drive model, and the PN board selection circuit 30 works to repair the PID effect of the corresponding component. When repairing the P-type photovoltaic panel, the relay K1 and relay K3 are turned on, and the positive electrode of the PID repair circuit 40 flows to the relay K1, through the diode D1 and the diode D2, and the solar panel 10 is boosted. The PE terminal is the ground terminal, and the solar panel 10 and the PE terminal 60 are connected similarly to the equivalent capacitor, and return to the negative electrode of the PID repair circuit 40 through the PE terminal 60 to achieve the repair of the P-type photovoltaic panel.

[0026] When repairing the N-type photovoltaic panel, relay K2 and relay K4 are turned on, and the positive electrode of the PID repair circuit 40 flows to relay K2 and PE terminal 60 in turn. The PE terminal 60 flows to the solar panel 10 through the equivalent capacitor, and then returns to the negative electrode of the PID repair circuit 40 through diodes D3 and D4, thereby repairing the N-type photovoltaic panel.

[0027] It should be noted that, in the present embodiment, the PID repair circuit 40 selects a PID repair circuit that has been disclosed in the prior art, for example, a PID repair circuit with application number 202311137055.2 previously filed by the applicant.

[0028] The embodiments of the present invention have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes are obvious to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or technical improvements in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A PN panel switching circuit of a solar panel PID effect repair circuit, comprising a PID repair circuit connected to a solar panel, wherein the solar panel comprises a P-type photovoltaic panel and an N-type photovoltaic panel; characterized in that: An anti-reverse circuit and a PN panel selection circuit are provided between the solar panel and the PID repair circuit, and the PN panel selection circuit is also connected to a controller for controlling the PN panel selection circuit; When repairing the PID effect, the PN panel selection circuit conducts the PID repair circuit with the solar panel, and the anti-reverse circuit is used to prevent the solar panel from short-circuiting and reverse conduction.

2. The PN panel switching circuit of the solar panel PID effect repair circuit according to claim 1 is characterized in that: The PN panel selection circuit includes a relay K1, a relay K2, a relay K3, and a relay K4 arranged between the solar panel and the PID repair circuit; The relay K1 and the relay K4 are respectively connected to the solar panel in parallel, and the relay K2 and the relay K3 are respectively connected to the PE terminal.

3. The PN panel switching circuit of the solar panel PID effect repair circuit according to claim 2 is characterized in that: The anti-reverse circuit includes a diode D1, a diode D2, a diode D3, and a diode D4; The diode D1 and the diode D2 are connected in parallel with the relay K1, and the diode D1 is connected to the positive electrode of the solar panel, and the diode D2 is connected to the negative electrode of the solar panel; The diode D3 and the diode D4 are connected in parallel with the relay K4 , and the diode D3 is connected to the positive electrode of the solar panel, and the diode D4 is connected to the negative electrode of the solar panel.

4. The PN panel switching circuit of the solar panel PID effect repair circuit according to claim 3 is characterized in that: The current of the diode D1 and the diode D2 is unidirectionally conducted from the circuit breaker K1 toward the solar panel; The current of the diodes D3 and D4 is unidirectionally conducted from the solar panel toward the circuit breaker K4.

5. The PN panel switching circuit of the solar panel PID effect repair circuit according to claim 4, characterized in that: The controller is signal-connected to the relay K1 , the relay K2 , the relay K3 , and the relay K4 , respectively.

6. The PN panel switching circuit of the solar panel PID effect repair circuit according to claim 5, characterized in that: A current limiting resistor R1 is also connected in series on the line between the PE terminal and the relay K2 and the relay K3.

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