Photovoltaic circuit breaker

Abstract

The photovoltaic circuit breaker comprises a circuit breaker main body and an expansion module, the expansion module is detachably connected with the circuit breaker main body through a plugging terminal, the expansion module comprises a boost unit, a dual-mode communication unit and a super capacitor, and the circuit breaker main body comprises a main control unit and a power supply unit; the boosting unit is connected with the power supply unit so as to carry out boosting processing on a direct current voltage signal from the power supply unit; the dual-mode communication unit is used for loading and outputting electric power communication signals; the super capacitor is used for standby energy storage so as to supply power to the dual-mode communication unit during power failure. According to the invention, the boost unit supplies power to the dual-mode communication unit and the super capacitor supplies power to the dual-mode communication unit during power failure, so that the photovoltaic circuit breaker can still perform data interaction, namely communication, with the master station during power failure, and the communication reliability is improved.

Description

Technical Field

[0001] The present application relates to the technical field of circuit breakers, and in particular to a photovoltaic circuit breaker. Background Art

[0002] As energy storage power supply shifts toward clean energy, photovoltaic grid-connected power generation has gradually become an important component of the flexible direct-current distribution network system. The power system tends to develop in the direction of new energy, intelligence, integration, larger communication bandwidth, higher speed, and higher reliability.

[0003] Although traditional grid-connected circuit breakers have common functions such as current, voltage, frequency measurement and protection, and leakage protection, they have the problem of unreliable communication. Utility Model Content

[0004] In view of the above problems, the present application provides a photovoltaic circuit breaker to solve the above technical problems.

[0005] In a first aspect, the present application provides a photovoltaic circuit breaker, which includes a circuit breaker body and an expansion module, wherein the expansion module is detachably connected to the circuit breaker body through a plug-in terminal, the expansion module includes a boost unit, a dual-mode communication unit and a super capacitor, and the circuit breaker body includes a main control unit and a power supply unit;

[0006] The boost unit is connected to the power supply unit to boost the DC voltage signal from the power supply unit; the dual-mode communication unit is used to load and output power communication signals; the supercapacitor is used for backup energy storage to supply power to the dual-mode communication unit when power is off.

[0007] In a possible implementation of the present application, the expansion module further includes a battery for supplying power to the dual-mode communication unit when power is off.

[0008] In one possible implementation of the present application, the dual-mode communication unit includes a high-speed carrier communication component and a high-speed micro-power wireless communication component;

[0009] The expansion module also includes a real-time clock unit, which is used for clock calibration.

[0010] In a possible implementation of the present application, the circuit breaker body also includes a photovoltaic detection circuit, which is connected to the main control unit and is used to sample the photovoltaic side voltage to obtain a photovoltaic side voltage sampling signal and output it to the main control unit so that the main control unit can perform islanding judgment and protection based on the photovoltaic side voltage sampling signal.

[0011] In a possible implementation of the present application, the photovoltaic detection circuit includes a rectifier unit, a buck unit, and an isolation unit connected in sequence, the rectifier unit includes a rectifier diode connected to each phase terminal of the three-phase electricity, the buck unit includes at least one voltage-dividing resistor connected in series, and the isolation unit includes an optical coupler;

[0012] Each phase terminal of the three-phase electricity is respectively connected to the anode of each rectifier diode, the cathode of each rectifier diode is connected to one end of the voltage-dividing resistor, the other end of the voltage-dividing resistor is connected to the anode of the optocoupler's light emitter, the cathode of the optocoupler's light emitter is connected to the neutral terminal through a diode, one end of the optocoupler's light receiver is connected to the power supply end through an inductor, and the other end of the optocoupler's light receiver is connected to the main control unit.

[0013] In a possible implementation of the present application, the circuit breaker body also includes a frequency sampling circuit, which includes an operational amplifier connected to the three-phase electrical terminals on the grid side respectively, the inverting input terminal of the operational amplifier is connected to the corresponding three-phase electrical terminals on the grid side through a voltage-dividing resistor string, the non-inverting input terminal of the operational amplifier is connected to the ground terminal, and the output terminal of the operational amplifier is connected to the main control unit.

[0014] In a possible implementation of the present application, the circuit breaker body further includes a fingerprint Bluetooth module, and the fingerprint Bluetooth module is connected to the main control unit to send and receive fingerprint Bluetooth communication signals.

[0015] In a possible implementation of the present application, the circuit breaker body further includes an isolation communication module connected to the main control unit, and the isolation communication module includes a 485 communication unit.

[0016] In a possible implementation of the present application, the circuit breaker body also includes a dual power conversion module, which is connected to the power supply unit to output a DC voltage signal to be converted to the power supply unit; the dual power conversion module includes a flyback converter and a buck converter.

[0017] In a possible implementation of the present application, the circuit breaker body also includes a leakage trip module and a motor drive module, and the dual power conversion module is respectively connected to the leakage trip module and the motor drive module to power the leakage trip module and the motor drive module through a DC voltage signal.

[0018] From the above content, it can be concluded that the present application has the following beneficial effects:

[0019] In the photovoltaic circuit breaker provided in the present application, the expansion module is detachably connected to the circuit breaker body through a plug-in terminal. The expansion module includes a boost unit, a dual-mode communication unit and a super capacitor. The power communication signal is loaded and output through the dual-mode communication unit, and the dual-mode communication unit is powered by the boost unit and the super capacitor when the power is off. This ensures that the photovoltaic circuit breaker can still interact with the main station for data, that is, communicate, when the power is off, thereby improving the reliability of communication.

[0020] These and other aspects of the present application will become more clearly understood in the description of the following embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 is a structural schematic diagram of a photovoltaic circuit breaker provided in an embodiment of the present application;

[0023] Figure 2 is another structural schematic diagram of a photovoltaic circuit breaker provided in an embodiment of the present application;

[0024] Figure 3 is another structural schematic diagram of a photovoltaic circuit breaker provided in an embodiment of the present application;

[0025] Figure 4 is a structural schematic diagram of a photovoltaic detection circuit provided in an embodiment of the present application;

[0026] Figure 5 It is a structural diagram of a frequency sampling circuit provided in an embodiment of the present application. DETAILED DESCRIPTION

[0027] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0028] In order to enable those skilled in the art to better understand the solutions of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present application.

[0029] In the embodiments of the present application, it should be noted that, in this article, relational terms such as first and second, etc. are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations.

[0030] Moreover, the terms "comprises", "comprising" or any other variation thereof are intended to cover non-exclusive inclusion, so that an article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such article or device. In the absence of more restrictions, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the article or device comprising the element.

[0031] In the description of the embodiments of the present application, words such as "example" or "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "example" or "for example" in the embodiments of the present application is not to be interpreted as being more preferred or having more advantages than another embodiment or design. The use of words such as "example" or "for example" is intended to present relative concepts in a clear manner.

[0032] In addition, the "plurality" in the embodiments of the present application refers to two or more than two. In view of this, in the embodiments of the present application, "plurality" can also be understood as "at least two". "At least one" can be understood as one or more, for example, one, two or more. For example, including at least one means including one, two or more, and there is no limit on which ones are included. For example, including at least one of A, B and C, then A, B, C, A and B, A and C, B and C, or A, B and C can be included.

[0033] It should be noted that in the embodiments of the present application, "connection" can be understood as electrical connection, and the connection between two electrical components can be a direct or indirect connection between the two electrical components. For example, the connection between A and B can be either a direct connection between A and B or an indirect connection between A and B through one or more other electrical components.

[0034] The photovoltaic circuit breaker provided in this application is described in detail below.

[0035] First, the present application embodiment provides a photovoltaic circuit breaker, see Figure 1 , Figure 1 It is a module schematic diagram of a photovoltaic circuit breaker provided in an embodiment of the present application. The photovoltaic circuit breaker may include a circuit breaker body 110 and an expansion module 120. The expansion module 120 can be detachably connected to the circuit breaker body 110 through a plug-in terminal 1201. The expansion module 120 may include a boost unit 1202, a dual-mode communication unit 1203 and a super capacitor 1204. The circuit breaker body 110 includes a power supply unit 1101 and a main control unit MCU.

[0036] The power supply unit 1101 can supply power to the main control unit MCU. For example, if the operating voltage of the main control unit MCU is 3.3V, the power supply unit 1101 can output 3.3V DC to the main control unit MCU to drive the main control unit MCU to work; it can be understood that if the operating voltage of the main control unit MCU is 5V, the power supply unit 1101 can output 5V DC to drive the main control unit MCU to work, that is, the voltage signal output by the power supply unit 1101 to the main control unit MCU can be adjusted according to the operating voltage of the main control unit MCU, which is not limited here.

[0037] The boost unit 1202 can be connected to the power supply unit 1101 of the circuit breaker body 110 to boost the DC voltage signal from the power supply unit 1101; the dual-mode communication unit 1203 can be used to load and output power communication signals; the supercapacitor 1204 can be used for backup energy storage to power the dual-mode communication unit 1203 when power is off.

[0038] In the embodiment of the present application, the expansion module 120 is detachably connected to the circuit breaker body 110 through the plug-in terminal 1201, so whether to connect the expansion module 120 can be selected according to the actual application scenario. When the expansion module 120 is connected, the functions configured by the expansion module 120 can be superimposed on the functions of the circuit breaker body 110 itself.

[0039] Specifically, the expansion module 120 may adopt an 18 mm expansion board, and the expansion board may be provided with a boost unit 1202 , a dual-mode communication unit 1203 and a super capacitor 1204 .

[0040] The boost unit 1202 can be any existing DC-DC boost power supply. The boost unit 1202 can boost the DC voltage signal from the power supply unit 1101 to obtain a voltage signal suitable for the dual-mode communication unit 1203 and output it to the dual-mode communication unit 1203 to power the dual-mode communication unit 1203.

[0041] In the embodiment of the present application, the power supply unit 1101 may be any existing DC voltage converter, and the power supply unit 1101 may convert the received DC voltage signal to be converted into a DC voltage signal and output it to the boost unit 1202 of the expansion module 120 .

[0042] In order to prevent the dual-mode communication unit 1203 from being unable to communicate with the main station during a power outage, in an embodiment of the present application, the supercapacitor 1204 is charged and stored with a DC voltage signal when the power is on, so that the dual-mode communication unit 1203 can be powered by its own stored energy during a power outage, thereby enabling the dual-mode communication unit 1203 to report a power outage.

[0043] In the photovoltaic circuit breaker provided in the present application, the expansion module 120 is detachably connected to the circuit breaker body 110 through the plug-in terminal 1201. The expansion module 120 includes a boost unit 1202, a dual-mode communication unit 1203 and a super capacitor 1204. The power communication signal is loaded and output through the dual-mode communication unit 1203, the dual-mode communication unit 1203 is powered by the boost unit 1202, and the dual-mode communication unit 1203 is powered by the super capacitor 1204 when the power is off, ensuring that the photovoltaic circuit breaker can still interact with the main station for data, that is, communicate, when the power is off, thereby improving the reliability of communication.

[0044] Next, continue to Figure 1 Each unit module shown and the specific implementation methods that may be used in practical applications are explained in detail.

[0045] like Figure 2 As shown, in some embodiments of the present application, the expansion module 120 may further include a battery 1205 for powering the dual-mode communication unit 1203 when power is off.

[0046] In the embodiment of the present application, in order to further ensure that the dual-mode communication unit 1203 can communicate with the main station within a certain period of time after power failure, a battery 1205 is provided to power the dual-mode communication unit 1203 to avoid interruption of communication during power failure, thereby further improving the reliability of the photovoltaic circuit breaker.

[0047] In some embodiments of the present application, the dual-mode communication unit 1203 may include a high-speed carrier communication component and a high-speed micro-power wireless communication component; the expansion module 120 may also include a real-time clock unit 1206, which can be used for clock calibration.

[0048] In an embodiment of the present application, the high-speed carrier communication component can adopt low-voltage power line high-speed carrier communication (HPLC) technology, and the high-speed micro-power wireless communication component can adopt wireless microwave power (HRF) technology. The dual-mode communication unit 1203 increases the communication rate and bandwidth by combining HPLC and HRF, which can improve the stability and real-time performance of power data transmission and realize the interconnection of multiple communication methods.

[0049] The real-time clock unit 1206 may adopt any existing real-time clock (RTC) chip. The real-time clock unit 1206 may adopt a crystal oscillator as a signal source to provide an accurate time reference for the system, that is, to perform clock calibration.

[0050] like Figure 3 As shown, in some embodiments of the present application, the circuit breaker body 110 may also include a photovoltaic detection circuit 1102 arranged on the photovoltaic side power supply board, the power supply unit 1101 and the main control unit MCU are arranged on the double-layer board bottom plate, and the photovoltaic detection circuit 1102 can be connected to the main control unit MCU to sample the photovoltaic side voltage, and obtain the photovoltaic side voltage sampling signal to output to the main control unit MCU, so that the main control unit MCU can perform island judgment and protection based on the photovoltaic side voltage sampling signal.

[0051] For details, please refer to Figure 4 The photovoltaic detection circuit 1102 may include a rectifying unit 11021, a buck unit 11022 and an isolation unit 11023 connected in sequence, wherein the rectifying unit 11021 may include a rectifying diode connected to each phase terminal (LA, LB, LC) of the three-phase electricity, and the buck unit 11022 may include at least one voltage-dividing resistor connected in series. Figure 4 In the figure, resistors R301, R302 and R303 are connected in series for voltage division, and the isolation unit 11023 may include an optical coupler U301.

[0052] Each phase terminal of the three-phase electricity is respectively connected to the anode of each rectifier diode, the cathode of each rectifier diode is connected to one end of the voltage-dividing resistor, the other end of the voltage-dividing resistor is connected to the anode of the light emitter of the optocoupler U301, the cathode of the light emitter of the optocoupler U301 is connected to the neutral terminal LN through the diode D307, one end of the light receiver of the optocoupler U301 is connected to the power supply terminal +3.3V through the inductor L301, and the other end of the light receiver of the optocoupler U301 is connected to the main control unit MCU to output the photovoltaic side voltage sampling signal MCU_PV.

[0053] In the embodiment of the present application, the circuit access part is the load end of the circuit breaker, that is, the photovoltaic inverter side. Rectifier diodes are used to replace the traditional rectifier bridge to rectify the alternating current, and a resistor divider string is used to step down the voltage on the photovoltaic side, so as to detect whether the voltage of the photovoltaic inverter connected to the load end exists, and perform island judgment and protection. Because the photovoltaic side should be isolated from the grid side, and the isolation withstand voltage requirement is high, the optocoupler U301 in the embodiment of the present application uses a wide-body optocoupler for photoelectric isolation to meet the requirement of the rated impulse withstand voltage of 6KV, which saves costs compared to traditional isolation and ensures isolation withstand voltage. The photovoltaic side voltage sampling signal MCU_PV output by the optical receiver of the optocoupler U301 to the main control unit MCU is an ADC signal, which can reflect the presence or absence of the photovoltaic side voltage and has the advantage of rapid judgment.

[0054] See also Figure 3 and Figure 5 In some embodiments of the present application, the circuit breaker body 110 may also include a frequency sampling circuit 1103 arranged on the power supply board on the grid side. The frequency sampling circuit 1103 may include operational amplifiers (U401A, U401B, U401C) respectively connected to the three-phase electrical terminals (A, B, C) on the grid side, and the inverting input terminals of the operational amplifiers are respectively connected to the corresponding three-phase electrical terminals on the grid side through a voltage-dividing resistor string, the non-inverting input terminals of the operational amplifiers are connected to the ground terminal AGND, and the output terminals of the operational amplifiers are connected to the main control unit MCU.

[0055] In the embodiments of the present application, the operational amplifiers all adopt a four-in-one operational amplifier of model SGM8544XTS14 / TR. Using the four-in-one operational amplifier as a comparator can reduce the number of external components in the circuit, eliminate the need for a hysteresis comparison part, and simplify the use of PCBs and components.

[0056] After the ABC three-phase voltage is divided by the voltage-dividing resistor string connected to the inverting input terminal of each operational amplifier, it is directly compared with the voltage of the ground terminal AGND. In the AC input, the part with a higher voltage than the ground terminal AGND is output as a high level 3.3V, and the part with a lower voltage than the ground terminal AGND is output as a low level 0V.

[0057] The frequency sampling circuit 1103 can sample the island frequency in a very short time (20ms / time) and make protection / measurement judgment in time. Compared with other common metering cores for frequency judgment, it can perform island protection more quickly and ensure the efficiency and safety of photovoltaic grid connection.

[0058] Please continue reading Figure 3 In some embodiments of the present application, the circuit breaker body 110 may further include a fingerprint Bluetooth module 1104 disposed on the fingerprint Bluetooth board, and the fingerprint Bluetooth module 1104 may be connected to the main control unit MCU to send and receive fingerprint Bluetooth communication signals.

[0059] Furthermore, the circuit breaker body 110 may also include an isolation communication module 1105 connected to the main control unit MCU, and the isolation communication module 1105 may include a 485 communication unit.

[0060] In the embodiment of the present application, compatibility with the reception and transmission of 485 communication / fingerprint Bluetooth communication signals can ensure timely and accurate data processing.

[0061] like Figure 3 As shown, in some embodiments of the present application, the circuit breaker body 110 may also include a dual power conversion module 1106 arranged on the double-layer board bottom plate, and the dual power conversion module 1106 can be connected to the power supply unit 1101 to output a DC voltage signal to be converted to the power supply unit 1101; the dual power conversion module 1106 may include a flyback converter and a buck converter.

[0062] In an embodiment of the present application, the dual power conversion module 1106 can be used to convert the AC voltage signal from the grid-side power board into a DC voltage signal to be converted and output it to the power supply unit 1101. The amplitude of the DC voltage signal to be converted can be 16V, and the power supply unit 1101 then converts the 16V voltage into a 3.3V power supply voltage to power the main control unit MCU and other unit modules.

[0063] The dual power conversion module 1106 may include a flyback converter and a buck converter, which can meet the large current required during the closing motor drive and tripping process, and ensure a fast start-up time (15ms) during the power startup process.

[0064] In some embodiments of the present application, the circuit breaker body 110 may also include a leakage trip module 1107 and a motor drive module 1108 arranged on the double-layer plate bottom plate, and the dual power conversion module 1106 can be connected to the leakage trip module 1107 and the motor drive module 1108 respectively to power the leakage trip module 1107 and the motor drive module 1108 through a 16V DC voltage signal.

[0065] like Figure 3 As shown, in the embodiment of the present application, three-phase four-wire power is taken from the power taking board on the grid side, the output end is connected to the photovoltaic inverter, and the input end uses EMC protection devices and rectifier filter devices to process the grid input AC power into a DC signal. At the same time, the input end uses a resistor divider string for voltage sampling and a transformer for current sampling.

[0066] The main control unit MCU adopts a 100-pin M4-MCU microprocessor, which is connected to the metering chip for voltage and current sampling. It uses a 13M crystal oscillator as a signal source and a PMOS transistor for switch control of the metering power supply. It can cooperate with the software to complete overvoltage / overcurrent / undervoltage / loss of voltage / phase failure protection, and realize accurate measurement and protection of grid current / voltage.

[0067] The main control unit MCU controls the motor part of the photovoltaic circuit breaker to perform opening and closing operations, and performs tripping and opening and closing operations when a leakage signal is detected.

[0068] In addition, the main control unit MCU can also be connected to an LED indicator light, and a red and blue two-color light can be used to complete manual / automatic / fault indication. The blue light is always on for manual opening and closing, the red light is always on for automatic opening and closing, and the red light flashes for a fault indication; a two-color leakage fault indicator light is used, the blue light indicates no leakage, and the red light indicates a leakage fault.

[0069] The main control unit MCU may also be connected to a temperature detection module 1109, which may utilize a negative temperature coefficient thermistor NTC to perform temperature sampling of the terminal, and respond to temperature faults in a timely manner, thereby ensuring the safety and stability of the entire system.

[0070] In the embodiment of the present application, the double-layer board bottom plate and the fingerprint Bluetooth board can constitute a double-layer board, the grid-side power-taking board and the photovoltaic-side power-taking board can be independent single small boards respectively, and the design structure of multi-board stacking / stereoscopic splicing is adopted to make full use of the small volume of the miniature circuit breaker. The circuit breaker body 110 realizes power quality detection, protection, photovoltaic island protection, overload / overvoltage / undervoltage protection, A+AC type leakage protection, simulated leakage, reclosing, motor drive and tripping, manual automatic opening and closing, 485 communication, fingerprint Bluetooth communication, and terminal temperature sampling protection functions; it is optional to add an expansion module 120 to realize multiple communication modes of HPLC+HRF dual-mode communication, as well as supercapacitor power outage reporting and RTC dedicated calibration clock function. The above two main electronic module parts are combined to comprehensively realize a more intelligent photovoltaic grid-connected miniature circuit breaker, which solves the pain points of the lack of island protection and dual-mode communication of circuit breaker products on the market, and has the advantages of multiple communications, rapid response for island protection, and optimization of photovoltaic power generation.

[0071] The above are only preferred embodiments of the present application, and are not intended to limit the present application in any form. Although the present application has been disclosed as above with preferred embodiments, it is not intended to limit the present application. Any technical personnel in the field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present application. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present application without departing from the content of the technical solution of the present application are still within the scope of the technical solution of the present application.

Claims

1. A photovoltaic circuit breaker, characterized in that: It includes a circuit breaker body and an expansion module, wherein the expansion module is detachably connected to the circuit breaker body through a plug-in terminal, the expansion module includes a boost unit, a dual-mode communication unit and a super capacitor, and the circuit breaker body includes a main control unit and a power supply unit; The boost unit is connected to the power supply unit to boost the DC voltage signal from the power supply unit to power the dual-mode communication unit; the dual-mode communication unit is used to load and output power communication signals; the supercapacitor is used for backup energy storage to power the dual-mode communication unit when power is off.

2. The photovoltaic circuit breaker according to claim 1, characterized in that: The expansion module also includes a battery for supplying power to the dual-mode communication unit when power is off.

3. The photovoltaic circuit breaker according to claim 1, characterized in that: The dual-mode communication unit includes a high-speed carrier communication component and a high-speed micro-power wireless communication component; The expansion module also includes a real-time clock unit, and the real-time clock unit is used for clock calibration.

4. The photovoltaic circuit breaker according to claim 1, characterized in that: The circuit breaker body also includes a photovoltaic detection circuit, which is connected to the main control unit and is used to sample the photovoltaic side voltage to obtain a photovoltaic side voltage sampling signal and output it to the main control unit, so that the main control unit can perform islanding judgment and protection based on the photovoltaic side voltage sampling signal.

5. The photovoltaic circuit breaker according to claim 4, characterized in that: The photovoltaic detection circuit comprises a rectifier unit, a voltage-reducing unit and an isolation unit connected in sequence, wherein the rectifier unit comprises a rectifier diode connected to each phase terminal of the three-phase electricity respectively, the voltage-reducing unit comprises at least one voltage-dividing resistor connected in series, and the isolation unit comprises an optical coupler; Each phase terminal of the three-phase electricity is respectively connected to the anode of each rectifier diode, the cathode of each rectifier diode is connected to one end of the voltage-dividing resistor, the other end of the voltage-dividing resistor is connected to the anode of the light emitter of the optocoupler, the cathode of the light emitter of the optocoupler is connected to the neutral terminal through a diode, one end of the light receiver of the optocoupler is connected to the power supply end through an inductor, and the other end of the light receiver of the optocoupler is connected to the main control unit.

6. The photovoltaic circuit breaker according to claim 1, characterized in that: The circuit breaker body also includes a frequency sampling circuit, which includes an operational amplifier connected to the three-phase electrical terminals on the grid side respectively, the inverting input terminal of the operational amplifier is connected to the corresponding three-phase electrical terminals on the grid side through a voltage-dividing resistor string, the non-inverting input terminal of the operational amplifier is connected to the ground terminal, and the output terminal of the operational amplifier is connected to the main control unit.

7. The photovoltaic circuit breaker according to claim 1, characterized in that: The circuit breaker body also includes a fingerprint Bluetooth module, which is connected to the main control unit to send and receive fingerprint Bluetooth communication signals.

8. The photovoltaic circuit breaker according to claim 1, characterized in that: The circuit breaker body also includes an isolation communication module connected to the main control unit, and the isolation communication module includes a 485 communication unit.

9. The photovoltaic circuit breaker according to claim 1, characterized in that: The circuit breaker body also includes a dual power conversion module, which is connected to the power supply unit to output a DC voltage signal to be converted to the power supply unit; the dual power conversion module includes a flyback converter and a buck converter.

10. The photovoltaic circuit breaker according to claim 9, characterized in that: The circuit breaker body also includes a leakage tripping module and a motor drive module, and the dual power conversion module is connected to the leakage tripping module and the motor drive module respectively to supply power to the leakage tripping module and the motor drive module through the DC voltage signal to be converted.

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