Turn-off device assembly and photovoltaic power generation system

Abstract

The invention relates to the technical field of photovoltaic power generation, and provides a turn-off device assembly and a photovoltaic power generation system.The turn-off device assembly comprises a turn-off device controller and at least one turn-off device, and the turn-off device controller is connected to a photovoltaic string loop in series; the turn-off device is connected in series in a photovoltaic string loop; the turn-off device is in communication connection with the turn-off device controller; wherein the turn-off device controller is used for sending a signal to control the turn-off device to be turned on or turned off earlier than the turn-off device controller. According to the turn-off device assembly, the total voltage of the whole photovoltaic string loop can be shared to each turn-off device, so that the voltage needing to be borne by a single turn-off device is reduced, the voltage resistance requirement of an MOS tube in the turn-off device is reduced, the economic cost of the MOS tube is effectively reduced, the type selection range of the MOS tube is expanded, the product quality and performance of the turn-off device are improved, and the production cost of the turn-off device is reduced. The heat of the MOS tube is reduced, the fire risk caused by heat accumulation is avoided, the safety of the photovoltaic power generation system is improved, and the service life of the turn-off device is prolonged.

Description

Technical Field

[0001] The present application relates to the field of photovoltaic power generation technology, and in particular to a circuit breaker assembly and a photovoltaic power generation system. Background Art

[0002] The circuit breaker in a photovoltaic power generation system is a switching device used to ensure the safety of the photovoltaic system. The function of the circuit breaker is to quickly cut off the circuit connection between the photovoltaic module and the power grid or inverter to eliminate the risk of DC high voltage and ensure the safety of personnel and equipment.

[0003] The existing wiring method of the circuit breaker in the related art requires high material costs and is prone to heat generation during continuous operation, causing circuit fires and further causing losses. Summary of the Invention

[0004] The embodiments of the present application provide a circuit breaker assembly and a photovoltaic power generation system, which can improve the technical problems in the related art that the circuit breaker is expensive and prone to heat and fire due to the wiring method.

[0005] In a first aspect, an embodiment of the present application provides a circuit breaker assembly, comprising: A circuit breaker controller, the circuit breaker controller being connected in series to a photovoltaic string circuit; At least one circuit breaker, the circuit breaker being connected in series in the photovoltaic string circuit; the circuit breaker being communicatively connected to the circuit breaker controller; The circuit breaker controller is used to send a signal to control the circuit breaker to be turned on or off before the circuit breaker controller.

[0006] The above technical solutions in the embodiments of the present application have at least the following technical effects: The circuit breaker assembly provided in the embodiments of the present application connects a circuit breaker controller and at least one circuit breaker in series within a photovoltaic string circuit. The circuit breaker controller controls the circuit breaker to first conduct the portion of the circuit in which it is located, and then the circuit breaker controller conducts the entire photovoltaic string circuit. When the circuit breaker is conducting, the circuit breaker is equivalent to being in an operational state, ready to withstand voltage. At this time, the circuit breaker controller conducts the entire photovoltaic string circuit, distributing the total voltage of the entire photovoltaic string circuit to each circuit breaker, thereby reducing the voltage that a single circuit breaker needs to withstand. This reduces the withstand voltage requirements of the circuit breaker, and in turn, the withstand voltage requirements of the MOS transistor within the circuit breaker, effectively reducing the economic cost of the MOS transistor and expanding the selection range of the MOS transistor. It also reduces the internal resistance of the MOS transistor, improves the product quality and performance of the circuit breaker, reduces the heat generation of the MOS transistor, avoids the risk of fire caused by heat accumulation, improves the safety of the photovoltaic power generation system, and extends the service life of the circuit breaker.

[0007] In some embodiments, the circuit breaker assembly further includes a power supply end electrically connected to the circuit breaker controller; the power supply end is used to provide power to the circuit breaker controller.

[0008] In some embodiments, the circuit breaker controller includes: A signal output module, one end of which is serially connected to the photovoltaic string circuit; the signal output module is communicatively connected to the circuit breaker; and the signal output module is electrically connected to the power supply end; A high-voltage control module, one end of the high-voltage control module is connected in series to the other end of the signal output module; the other end of the high-voltage control module is connected in series to the photovoltaic string circuit; the high-voltage control module is electrically connected to the power supply end; the high-voltage control module is communicatively connected to the signal output module; the high-voltage control module is used to control the on and off of the photovoltaic string circuit according to the signal of the signal output module.

[0009] In some embodiments, the signal output module includes: A signal generator, the signal generator being electrically connected to the power supply end; the signal generator being communicatively connected to the circuit breaker; the signal generator being used to send a signal for controlling the on / off state of the circuit breaker; A signal output pulse transformer, one end of which is connected in series to the photovoltaic string circuit; the other end of which is connected in series to the high-voltage control module; and the signal output pulse transformer is used to output a pulse signal to the high-voltage control module.

[0010] In some embodiments, the high voltage control module includes: A high-voltage MOS transistor, one end of which is connected to the output end of the signal output pulse transformer; A switch control circuit, the switch control circuit is electrically connected to the high-voltage MOS tube; the switch control circuit is electrically connected to the power supply end; the switch control circuit is communicatively connected to the signal generator; the switch control circuit is used to control the high-voltage MOS tube to turn on after the switch is turned on, or to turn off after the switch is turned off.

[0011] In some embodiments, the circuit breaker comprises: A signal receiving module, one end of which is serially connected to the photovoltaic string circuit; A low-voltage control module, one end of the low-voltage control module is electrically connected to the other end of the signal receiving module; the other end of the low-voltage control module is serially connected to the photovoltaic string circuit; the low-voltage control module is electrically connected to the power supply end.

[0012] In some embodiments, the signal receiving module includes: a signal receiving pulse transformer, one end of which is connected in series to the photovoltaic string circuit; A signal conversion and shaping circuit is communicatively connected to the signal receiving pulse transformer; the signal conversion and shaping circuit is used to perform voltage stabilization and shaping processing on the signal received by the signal receiving pulse transformer.

[0013] In some embodiments, the low voltage control module includes: A MOS control circuit, the MOS control circuit being communicatively connected to the signal conversion and shaping circuit; the MOS control circuit being electrically connected to the power supply end; A low-voltage MOS transistor, one end of which is connected to the other end of the signal receiving pulse transformer; the other end of which is connected in series to the photovoltaic string circuit; and the low-voltage MOS transistor is electrically connected to the MOS control circuit; The MOS control circuit is used to control the low-voltage MOS transistor to be turned on before the shutdown controller is turned on, or to be turned off before the shutdown controller is turned off.

[0014] In some embodiments, the MOS control circuit can control the on / off of the low-voltage MOS transistor according to ambient temperature changes.

[0015] In some embodiments, the circuit breaker is connected to one incoming line and one outgoing line of the photovoltaic string circuit.

[0016] In a second aspect, an embodiment of the present application provides a photovoltaic power generation system, comprising: Inverter; at least one photovoltaic panel, the photovoltaic panel being connected in series to the inverter; and In the circuit breaker assembly as described in any one of the above embodiments, the circuit breaker controller is electrically connected in series to one end of the inverter close to the photovoltaic panel; and the circuit breakers are connected in series one by one to one end of the photovoltaic panel away from the circuit breaker controller.

[0017] The above technical solutions in the embodiments of the present application have at least the following technical effects: The photovoltaic power generation system provided in the embodiments of the present application uses a control circuit of a circuit breaker controller to enable the circuit breaker to adopt a low-voltage MOS transistor with a low driving voltage. This not only improves the response speed of the circuit breaker, but also expands the selection range of the circuit breaker and reduces the manufacturing cost of the circuit breaker. Because the low-voltage MOS transistor has the characteristics of low resistance, high current flow, and low driving voltage, the temperature rise of the low-voltage MOS transistor is small, which effectively reduces the risk of circuit fire and improves the reliability and safety of the photovoltaic power generation system. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments or descriptions of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0019] Figure 1 A schematic diagram of the structure of a circuit breaker controller provided in an embodiment of the present application; Figure 2 Schematic diagram of the structure of the circuit breaker provided in the embodiment of the present application Figure 2 ; Figure 3 A schematic diagram of the electrical connection of a photovoltaic power generation system provided in an embodiment of the present application; Figure 4 This is a schematic diagram of another form of electrical connection of the photovoltaic power generation system provided in an embodiment of the present application.

[0020] Among them, the reference numerals in the figures are: 1000, photovoltaic power generation system; 100, shutdown controller; 101, power supply end; 102, signal output module; 1021, signal generator; 1022, signal output pulse transformer; 103, high-voltage control module; 1031, high-voltage MOS transistor; 1032, switch control circuit; 200, shutdown; 201, signal receiving module; 2011, signal receiving pulse transformer; 2012, signal conversion and shaping circuit; 202, low-voltage control module; 2021, MOS control circuit; 2022, low-voltage MOS transistor; 300, inverter; 400, photovoltaic panel. DETAILED DESCRIPTION

[0021] In order to make the technical problems, technical solutions and beneficial effects to be solved by this application more clearly understood, this application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are for the purpose of describing specific embodiments only and are not intended to limit this application. The terms "including" and "having" and any variations thereof in the specification and claims of this application and the accompanying drawings are intended to cover non-exclusive inclusions.

[0023] It should be noted that when an element is referred to as being “fixed on” or “disposed on” another element, it may be directly on the other element or indirectly on the other element. When an element is referred to as being “connected to” another element, it may be directly connected to the other element or indirectly connected to the other element.

[0024] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0025] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. Throughout the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0026] In this application, "and / or" is simply a way to describe the relationship between related objects, indicating that three possible relationships exist. For example, "A and / or B" can mean: A exists alone, A and B exist simultaneously, or B exists alone. Additionally, the character " / " in this document generally indicates that the related objects are in an "or" relationship.

[0027] It should be noted that, in this application, words such as "in some embodiments", "exemplarily", "for example", etc. are used to indicate examples, illustrations or explanations. Any embodiment or design described in this application as "in some embodiments", "exemplarily", "for example" should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "in some embodiments", "exemplarily", "for example" is intended to present related concepts in a concrete way, meaning that the specific features, structures or characteristics described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the above words in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0028] The circuit breaker in a photovoltaic power generation system is a switching device used to ensure the safety of the photovoltaic system. The function of the circuit breaker is to quickly cut off the circuit connection between the photovoltaic module and the power grid or inverter to eliminate the risk of DC high voltage and ensure the safety of personnel and equipment.

[0029] The existing wiring method of the circuit breaker in the related art requires high material costs and is prone to heat generation during continuous operation, causing circuit fires and further causing losses.

[0030] Based on this, in order to improve the technical problems in the related art that the circuit breaker is expensive and prone to overheating and fire due to the wiring method, the embodiments of the present application provide the following solutions.

[0031] Please also refer to Figure 1 and Figure 2 An embodiment of the present application provides a circuit breaker 200 component, which includes a circuit breaker controller 100 and at least one circuit breaker 200. The circuit breaker controller 100 is connected in series to a photovoltaic string circuit; the circuit breaker 200 is connected in series to the photovoltaic string circuit; the circuit breaker 200 is communicatively connected to the circuit breaker controller 100; wherein the circuit breaker controller 100 is used to send a signal to control the circuit breaker 200 to be turned on or off before the circuit breaker controller 100.

[0032] It is understood that the disconnector controller 100 is a component for sending signals to the disconnector 200 to control its opening or closing. For example, a PLC (power line carrier) communication controller or a wireless communication controller may be employed, but is not limited to these. The disconnector 200 is a component for rapidly disconnecting photovoltaic modules and reducing voltage in the event of abnormal conditions such as overload or fire in the photovoltaic module output lines. The disconnector 200 may be a one-to-one fast disconnector 200 or a one-to-two fast disconnector 200, but is not limited to these. A photovoltaic string circuit is a power generation unit comprising photovoltaic panels 400, inverter 300, and other components. The disconnector controller 100 controls the disconnector 200 to energize the photovoltaic string circuit before the disconnector controller 100 itself. This allows the MOS transistors within each disconnector 200 to be in an on-state. When the disconnector controller 100 energizes the photovoltaic string circuit, the voltage of the entire photovoltaic string circuit can be distributed to each photovoltaic panel 400.

[0033] From the above, it can be seen that the circuit breaker 200 component provided in the embodiment of the present application connects the circuit breaker controller 100 and at least one circuit breaker 200 in series in the photovoltaic string circuit, and controls the circuit breaker 200 through the circuit breaker controller 100 to first turn on the part of the circuit where it is located, and then the circuit breaker controller 100 turns on the entire photovoltaic string circuit. When the circuit breaker 200 is turned on, the circuit breaker 200 is equivalent to being in a working state and ready to withstand voltage. At this time, the circuit breaker controller 100 turns on the entire photovoltaic string circuit, and can distribute the total voltage of the entire photovoltaic string circuit to each circuit breaker 200, thereby reducing the voltage that a single circuit breaker 200 needs to withstand. In this way, the withstand voltage requirement of the circuit breaker 200 is reduced, and the withstand voltage requirement of the MOS tube in the circuit breaker 200 can be reduced, which effectively reduces the economic cost of the MOS tube and expands the selection range of the MOS tube. At the same time, it can also reduce the internal resistance of the MOS tube, improve the product quality and performance of the circuit breaker 200, reduce the heat generation of the MOS tube, avoid the risk of fire caused by heat accumulation, improve the safety of the photovoltaic power generation system 1000, and extend the service life of the circuit breaker 200.

[0034] In some embodiments, please refer to Figure 1 The circuit breaker 200 component further includes an electric energy supply terminal 101 , which is electrically connected to the circuit breaker controller 100 ; the electric energy supply terminal 101 is used to provide electric energy to the circuit breaker controller 100 .

[0035] It can be understood that the power supply end 101 is a component used to provide power to the circuit breaker controller 100. The power of the power supply end 101 can come from the photovoltaic string circuit, and obtain power directly from the photovoltaic string through wiring. After circuit processing such as voltage stabilization and filtering, a stable DC power supply is provided to the circuit breaker controller 100; or a battery can be used as the power supply end 101 to provide power support for the circuit breaker controller 100, but it is not limited to this.

[0036] With this arrangement, the power supply terminal 101 provides power to the circuit breaker controller 100, ensuring that the circuit breaker controller 100 can operate normally at any time. In the event of a power grid failure or emergency, battery power can be used as a guarantee to enable the photovoltaic string circuit to be safely shut down, thereby enhancing the stability and reliability of the system.

[0037] In some embodiments, see Figure 1 The circuit breaker controller 100 includes a signal output module 102 and a high-voltage control module 103. One end of the signal output module 102 is connected in series to the photovoltaic string circuit; the signal output module 102 is communicatively connected to the circuit breaker 200; the signal output module 102 is electrically connected to the power supply terminal 101; one end of the high-voltage control module 103 is connected in series to the other end of the signal output module 102; the other end of the high-voltage control module 103 is connected in series to the photovoltaic string circuit; the high-voltage control module 103 is electrically connected to the power supply terminal 101; the high-voltage control module 103 is communicatively connected to the signal output module 102; the high-voltage control module 103 is used to control the on and off of the photovoltaic string circuit according to the signal of the signal output module 102.

[0038] It is understood that the signal output module 102 is a module for respectively issuing switching signals to each circuit breaker 200 and the high-voltage control module 103 in the photovoltaic string circuit. The signal output module 102 may include a signal generation unit for generating a signal to control the on and off state of the circuit breaker 200, and a signal conditioning unit for amplifying, filtering, and shaping the generated signal to meet the input requirements of the circuit breaker 200. The signal conditioning unit may include, but is not limited to, an amplifier circuit such as an operational amplifier, a filter circuit such as a low-pass filter or a high-pass filter, and a shaping circuit such as a Schmitt trigger. The high-voltage control module 103 is a module for controlling its own on and off state based on the switching signal generated by the signal output module 102. The high-voltage control module 103 may include a signal processing unit and a high-voltage MOSFET 1031. The signal processing unit is configured to receive the switching signal from the signal output module 102 and convert the switching signal into a drive signal to control the on and off state of the high-voltage MOSFET 1031, thereby controlling the on and off state of the photovoltaic string circuit.

[0039] In this configuration, a signal output module 102 and a high-voltage control module 103 are provided in the circuit breaker controller 100. The signal output module 102 generates a switching signal and outputs the switching signal to the high-voltage control module 103 and the circuit breaker 200. The high-voltage controller controls the on-off of the photovoltaic string circuit according to the switching signal, and the high-voltage control module 103 processes the switching signal and then controls the on-off of the photovoltaic string circuit. This is conducive to quickly disconnecting the photovoltaic string circuit and reducing the system voltage to a safe range. The high-voltage control module 103 and the circuit breaker 200 form redundant control, thereby improving the reliability and safety of the system, and can realize the on-off sequence of the high-voltage control module 103 and the circuit breaker 200, reducing the withstand voltage requirement of the circuit breaker 200, expanding the selection range of the circuit breaker 200, and thus reducing the cost of the circuit breaker 200.

[0040] In some embodiments, see Figure 1 The signal output module 102 includes a signal generator 1021 and a signal output pulse transformer 1022. The signal generator 1021 is electrically connected to the power supply end 101; the signal generator 1021 is communicatively connected to the circuit breaker 200; the signal generator 1021 is used to send a signal to control the on / off state of the circuit breaker 200; one end of the signal output pulse transformer 1022 is connected in series to the photovoltaic string circuit; the other end of the signal output pulse transformer 1022 is connected in series to the high-voltage control module 103; the signal output pulse transformer 1022 is used to output a pulse signal to the high-voltage control module 103.

[0041] It is understood that the signal generator 1021 is a component for generating a switching signal and outputting the signal to each circuit breaker 200. The signal generator 1021 can be a microcontroller (MCU) or a digital signal processor (DSP), but is not limited thereto. The signal output pulse transformer 1022 is a component for converting and transmitting the signal generated by the signal generator 1021. The signal output pulse transformer 1022 can convert the signal generated by the signal generator 1021 into a drive signal that can drive the high-voltage MOS tube 1031 to conduct. The drive signal controls the on / off state of the high-voltage MOS tube 1031 by controlling the magnitude of the gate voltage of the high-voltage MOS tube 1031. With this arrangement, a switching signal is generated by the signal generator 1021 to determine the on / off status of the main circuit of the photovoltaic string and the branch where each circuit breaker 200 is located. The signal output pulse transformer 1022 amplifies the switching signal and converts the switching signal into a drive signal, thereby controlling the on / off state of the high-voltage MOS tube 1031 according to the switching signal. This is conducive to accurately controlling the on / off state of the high-voltage MOS tube 1031, providing electrical isolation between the signal generator 1021 and the high-voltage control module 103, preventing high-voltage side faults from damaging the signal generator 1021 and the power supply end 101, reducing signal distortion, improving the switching speed and efficiency of the system, and ensuring reliable operation of the system.

[0042] In some embodiments, see Figure 1 The high-voltage control module 103 includes a high-voltage MOS transistor 1031 and a switch control circuit 1032. One end of the high-voltage MOS transistor 1031 is connected to the output end of the signal output pulse transformer 1022; the switch control circuit 1032 is electrically connected to the high-voltage MOS transistor 1031; the switch control circuit 1032 is electrically connected to the power supply end 101; the switch control circuit 1032 is communicatively connected to the signal generator 1021; the switch control circuit 1032 is used to control the high-voltage MOS transistor 1031 to turn on after the shutdown device 200 is turned on, or to turn off after the shutdown device 200 is turned off.

[0043] It is understood that the switch control circuit 1032 is used to control whether the high-voltage MOS transistor 1031 is turned on or off based on the switch signal from the signal generator 1021. The switch control circuit 1032 may be implemented as an application-specific integrated circuit (ASIC) or a programmable logic device (CPLD / FPGA), but is not limited thereto. The high-voltage MOS transistor 1031 is used to determine whether to turn on or off based on the drive signal from the signal output pulse transformer 1022 and the control of the switch control circuit 1032, thereby controlling the on / off of the photovoltaic string circuit.

[0044] With this arrangement, the signal output pulse transformer 1022 converts the switching signal into a driving signal capable of driving the high-voltage MOS tube 1031 to conduct, so that the conduction of the high-voltage MOS tube 1031 has the prerequisites. The on-off of the high-voltage MOS tube 1031 is then controlled by the switch control circuit 1032, which is conducive to realizing intelligent control, ensuring the rapid conduction and shutdown of the high-voltage MOS tube 1031, reducing switching delays, improving the response speed of the system, and flexibly controlling the on-off of the photovoltaic string circuit according to actual needs.

[0045] In some embodiments, see Figure 2The circuit breaker 200 includes a signal receiving module 201 and a low-voltage control module 202. One end of the signal receiving module 201 is connected in series to the photovoltaic string circuit; one end of the low-voltage control module 202 is electrically connected to the other end of the signal receiving module 201; the other end of the low-voltage control module 202 is connected in series to the photovoltaic string circuit; and the low-voltage control module 202 is electrically connected to the power supply end 101.

[0046] It is understood that the signal receiving module 201 is a component for receiving and processing signals from the signal output module 102, and can be, for example, a wired communication module or a wireless communication module. The low-voltage control module 202 is a component for controlling the on / off state of the branch circuit based on the signal received by the signal receiving module 201, and can be, for example, a mechanical switch or an electronic switch.

[0047] With such a configuration, the signal of the signal output module 102 is received and processed by the signal receiving module 201, and the low-voltage control module 202 controls the on and off of the branch according to the signal. In this way, remote control and intelligent control of the circuit breaker 200 can be realized to achieve different control modes, thereby improving the adaptability and scalability of the circuit breaker 200, and effectively improving the response speed of the circuit breaker 200 when facing electrical faults, which can prevent the fault and loss from further expanding, and reduce downtime and maintenance costs.

[0048] In some embodiments, see Figure 2 The signal receiving module 201 includes a signal receiving pulse transformer 2011 and a signal conversion and shaping circuit 2012. One end of the signal receiving pulse transformer 2011 is connected in series to the photovoltaic string circuit; the signal conversion and shaping circuit 2012 is communicatively connected to the signal receiving pulse transformer 2011; the signal conversion and shaping circuit 2012 is used to perform voltage stabilization and shaping processing on the signal received by the signal receiving pulse transformer 2011.

[0049] It is understood that the signal receiving pulse transformer 2011 is a component for amplifying the voltage of the AC signal to a voltage level sufficient to conduct the branch circuit. The signal receiving pulse transformer 2011 can employ the same structure as the signal output pulse transformer 1022. The signal conversion and shaping circuit 2012 is a circuit for shaping and stabilizing the pulsed AC signal to a voltage level sufficient to conduct the branch circuit. For example, a linear regulator, a switching regulator, a high-voltage Zener diode voltage regulator circuit, or a multivibrator and Schmitt trigger shaping circuit can be employed, but are not limited thereto.

[0050] In this way, the pulse signal output by the signal output pulse transformer 1022 to the photovoltaic string circuit is amplified through the signal receiving pulse transformer 2011 to achieve the voltage value for turning on the branch, and the signal conversion and shaping circuit 2012 is set to shape and stabilize the pulse AC signal, which can enhance the driving ability of the pulse signal and make the pulse signal stable without noise. The stable driving signal can reduce false triggering or shutdown caused by signal fluctuations, enhance the reliability of the circuit breaker 200, improve the compatibility of the circuit breaker 200, and extend the life of the components on the branch, reduce power loss, and ensure the safety of the photovoltaic string circuit.

[0051] In some embodiments, see Figure 2 The low-voltage control module 202 includes a MOS control circuit 2021 and a low-voltage MOS transistor 2022. The MOS control circuit 2021 is communicatively connected to the signal conversion and shaping circuit 2012; the MOS control circuit 2021 is electrically connected to the power supply end 101; one end of the low-voltage MOS transistor 2022 is connected to the other end of the signal receiving pulse transformer 2011; the other end of the low-voltage MOS transistor 2022 is connected in series with the photovoltaic string circuit; the low-voltage MOS transistor 2022 is electrically connected to the MOS control circuit 2021; wherein the MOS control circuit 2021 is used to control the low-voltage MOS transistor 2022 to be turned on before the shutdown controller 100 is turned on, or to be turned off before the shutdown controller 100 is turned off.

[0052] It can be understood that the MOS control circuit 2021 is a circuit for controlling the on / off switching of the low-voltage MOS transistor 2022 based on a pulse signal. The MOS control circuit 2021 can employ the same structure as the switch control circuit 1032. The low-voltage MOS transistor 2022 is a component that switches on and off based on the drive signal from the signal receiving pulse transformer 2011 and the control signal from the switch control circuit 1032. The drive voltage of the low-voltage MOS transistor 2022 is lower than the drive voltage of the high-voltage MOS transistor 1031.

[0053] In this configuration, a MOS control circuit 2021 is provided in the low-voltage control module 202. The on / off state of the low-voltage MOS transistor 2022 is controlled according to the preset logic and pulse signal of the MOS control circuit 2021, so that the low-voltage MOS transistor 2022 is turned on before the shutdown controller 100 is turned on, or turned off before the shutdown controller 100 is turned off. This effectively reduces the driving voltage of the low-voltage MOS transistor 2022, expands the selection range of the low-voltage MOS transistor 2022, and reduces the manufacturing cost of the shutdown device 200. The low-voltage MOS transistor 2022 has a faster switching speed than the high-voltage MOS transistor 1031, which reduces the response time of the shutdown device 200 and can be quickly turned off to disconnect the circuit, preventing the expansion of the fault. The low-voltage MOS transistor 2022 has a low on-resistance and low heat dissipation requirements, which can reduce heat dissipation requirements, optimize the overall performance of the system, and improve energy conversion efficiency.

[0054] In some embodiments, the MOS control circuit 2021 can control the on / off of the low-voltage MOS transistor 2022 according to the ambient temperature change.

[0055] It can be understood that the MOS control circuit 2021 can control the on and off of the low-voltage MOS tube 2022 according to the temperature changes of the photovoltaic panel 400 in the branch and the temperature changes of the low-voltage MOS tube 2022. The MOS control circuit 2021 can include a temperature sensor and a microprocessor MCU to convert the temperature change signal into an on-off signal to control the low-voltage MOS tube 2022.

[0056] With this configuration, by integrating a temperature sensor and an MCU in the MOS control circuit 2021, the MOS control circuit 2021 can accurately control the on and off of the low-voltage MOS tube 2022 according to temperature changes, thereby improving system safety, reliability, and efficiency, while reducing the risk of failure and lowering maintenance costs.

[0057] In some embodiments, see Figure 2 The circuit breaker 200 is connected to one incoming line and one outgoing line of the photovoltaic string circuit.

[0058] Such a setting simplifies the incoming and outgoing lines of the circuit breaker 200, reduces the complexity of wiring, reduces the number of cables used and the workload of wiring, reduces the difficulty of installation and subsequent maintenance work, reduces the cost required for installation and maintenance, reduces the risk of failure due to too many connection points, and improves the system's anti-interference ability and reliability.

[0059] Optionally, in some embodiments, see Figure 4 The power supply terminal 101 is provided in the circuit breaker controller 100 and is electrically connected to the MOS control circuit 2021 of each circuit breaker 200 via an auxiliary power line. The circuit breaker controller 100 transmits power to each circuit breaker 200 via the auxiliary power line to control the on / off of each low-voltage MOS transistor 2022.

[0060] Optionally, the circuit breaker 200 further includes a PLC carrier module, which is electrically connected to the circuit breaker controller 100 , and is configured to transmit signals including temperature data of the circuit breaker 200 and switch status data of the circuit breaker 200 .

[0061] With such a setting, the circuit breaker controller 100 and the circuit breaker 200 are connected by wire through the auxiliary power line, which can significantly improve the speed of signal transmission, facilitate rapid control of the switch of the circuit breaker 200, improve the response speed of the system, extend the effective distance of signal transmission, and make the transmitted signal more stable and reliable, thereby avoiding the occurrence of maloperation of the circuit breaker 200 and improving the overall safety of the system.

[0062] See also Figure 3 and Figure 4 The embodiment of the present application further provides a photovoltaic power generation system 1000, which includes an inverter 300, at least one photovoltaic panel 400, and a circuit breaker 200 assembly as described in any one of the above embodiments, wherein the photovoltaic panel 400 is connected in series to the inverter 300; the circuit breaker controller 100 is electrically connected in series to one end of the inverter 300 close to the photovoltaic panel 400; and the circuit breaker 200 is connected in series one-to-one to one end of the photovoltaic panel 400 away from the circuit breaker controller 100.

[0063] As can be seen from the foregoing, the photovoltaic power generation system 1000 provided in the embodiment of the present application connects the circuit breaker 200 to the photovoltaic panel 400 in a one-to-one correspondence, enabling the circuit breaker 200 to control the branch circuit in which the photovoltaic panel 400 is located. The circuit breaker controller 100 is disposed at the output terminal of the inverter 300, enabling the circuit breaker controller 100 to control each circuit breaker 200, and thereby controlling the connection of each photovoltaic panel 400 to the main circuit. The control circuit of the circuit breaker controller 100 enables the circuit breaker 200 to use a low-voltage MOS transistor 2022 with a low driving voltage. This not only improves the response speed of the circuit breaker 200, but also expands the selection range of the circuit breaker 200 and reduces the manufacturing cost of the circuit breaker 200. Due to the low resistance, high current flow rate, and low driving voltage characteristics of the low-voltage MOS transistor 2022, the temperature rise of the low-voltage MOS transistor 2022 is small, effectively reducing the risk of circuit fire, and improving the reliability and safety of the photovoltaic power generation system 1000.

[0064] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A circuit breaker assembly, characterized in that: The circuit breaker assembly comprises: A circuit breaker controller, the circuit breaker controller being connected in series to a photovoltaic string circuit; At least one circuit breaker, the circuit breaker being connected in series in the photovoltaic string circuit; the circuit breaker being communicatively connected to the circuit breaker controller; The circuit breaker controller is used to send a signal to control the circuit breaker to be turned on or off before the circuit breaker controller.

2. The circuit breaker assembly according to claim 1, wherein: The circuit breaker assembly further includes an electric energy supply end, the electric energy supply end being electrically connected to the circuit breaker controller; the electric energy supply end being used to provide electric energy to the circuit breaker controller; and / or The number of incoming lines and outgoing lines of the circuit breaker connected to the photovoltaic string circuit is one.

3. The circuit breaker assembly according to claim 2, wherein: The shutdown controller comprises: A signal output module, one end of which is serially connected to the photovoltaic string circuit; the signal output module is communicatively connected to the circuit breaker; and the signal output module is electrically connected to the power supply end; A high-voltage control module, one end of the high-voltage control module is connected in series to the other end of the signal output module; the other end of the high-voltage control module is connected in series to the photovoltaic string circuit; the high-voltage control module is electrically connected to the power supply end; the high-voltage control module is communicatively connected to the signal output module; the high-voltage control module is used to control the on and off of the photovoltaic string circuit according to the signal of the signal output module.

4. The circuit breaker assembly according to claim 3, wherein: The signal output module includes: A signal generator, the signal generator being electrically connected to the power supply end; the signal generator being communicatively connected to the circuit breaker; the signal generator being used to send a signal for controlling the on / off state of the circuit breaker; A signal output pulse transformer, one end of which is connected in series to the photovoltaic string circuit; the other end of which is connected in series to the high-voltage control module; and the signal output pulse transformer is used to output a pulse signal to the high-voltage control module.

5. The circuit breaker assembly according to claim 4, wherein: The high-voltage control module includes: A high-voltage MOS transistor, one end of which is connected to the output end of the signal output pulse transformer; A switch control circuit, the switch control circuit is electrically connected to the high-voltage MOS tube; the switch control circuit is electrically connected to the power supply end; the switch control circuit is communicatively connected to the signal generator; the switch control circuit is used to control the high-voltage MOS tube to turn on after the switch is turned on, or to turn off after the switch is turned off.

6. The circuit breaker assembly according to claim 2, wherein: The circuit breaker comprises: A signal receiving module, one end of which is serially connected to the photovoltaic string circuit; A low-voltage control module, one end of the low-voltage control module is electrically connected to the other end of the signal receiving module; the other end of the low-voltage control module is serially connected to the photovoltaic string circuit; the low-voltage control module is electrically connected to the power supply end.

7. The circuit breaker assembly according to claim 6, wherein: The signal receiving module includes: a signal receiving pulse transformer, one end of which is connected in series to the photovoltaic string circuit; A signal conversion and shaping circuit is communicatively connected to the signal receiving pulse transformer; the signal conversion and shaping circuit is used to perform voltage stabilization and shaping processing on the signal received by the signal receiving pulse transformer.

8. The circuit breaker assembly according to claim 7, wherein: The low voltage control module includes: A MOS control circuit, the MOS control circuit being communicatively connected to the signal conversion and shaping circuit; the MOS control circuit being electrically connected to the power supply end; A low-voltage MOS transistor, one end of which is connected to the other end of the signal receiving pulse transformer; the other end of which is connected in series to the photovoltaic string circuit; and the low-voltage MOS transistor is electrically connected to the MOS control circuit; The MOS control circuit is used to control the low-voltage MOS transistor to be turned on before the shutdown controller is turned on, or to be turned off before the shutdown controller is turned off.

9. The disconnector assembly according to claim 8, wherein: The MOS control circuit can control the on and off of the low-voltage MOS tube according to the ambient temperature change.

10. A photovoltaic power generation system, characterized in that: include: Inverter; at least one photovoltaic panel, the photovoltaic panel being connected in series to the inverter; as well as According to any one of claims 1 to 9 above, the circuit breaker controller is electrically connected in series to an end of the inverter close to the photovoltaic panel; and the circuit breakers are connected in series one by one to an end of the photovoltaic panel away from the circuit breaker controller.

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