Protection circuit and over-temperature protection device for high-frequency filter capacitor of photovoltaic inverter

Abstract

The utility model relates to the technical field of equipment over-temperature protection, and discloses a protection circuit and an over-temperature protection device for a high-frequency filter capacitor of a photovoltaic inverter, a temperature protection module is introduced into a high-frequency filter module, and the temperature protection module acquires and monitors the temperature corresponding to the high-frequency filter module. Then the collected temperature signals are encoded and transmitted to a processing host corresponding to the photovoltaic inverter, the host decodes and analyzes the encoded temperature signals, intelligent monitoring of the current module temperature of the high-frequency filtering module is achieved, and when it is detected that the module temperature reaches the set early warning temperature, the high-frequency filtering module is started to perform early warning. The host generates a response control signal and transmits the response control signal to the temperature protection module, the temperature protection module executes matched temperature control operation according to the control signal, and then over-temperature early warning and / or over-temperature control of the high-frequency filtering module and / or the photovoltaic inverter are / is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of equipment over-temperature protection, in particular to a protection circuit and an over-temperature protection device for a high-frequency filtering capacitor of a photovoltaic inverter. Background Art

[0002] In the existing power grid application field, the photovoltaic inverter is one of the more commonly used devices. And based on various usage requirements of the photovoltaic inverter, such as filtering high-frequency harmonics, stabilizing output voltage and current, protecting equipment, improving system performance, meeting standard and regulatory requirements, etc., it is default to set a high-frequency filtering capacitor / capacitors on the output side of the photovoltaic inverter. Among them, for the high-frequency filtering capacitors commonly used in the market, their temperature protection mainly relies on the fact that after the capacitor fails, the temperature rises, the internal pressure increases, and the copper wire leading from the inside of the capacitor to the external terminal is broken, that is, the so-called tensile explosion protection. This scheme relies on the temperature accumulating to a certain extent and directly breaking the capacitor copper wire by pressure, making the inside of the high-frequency filtering capacitor open circuit. And the setting of this temperature protection scheme will damage the high-frequency filtering capacitor at the same time, reducing the practicability of the scheme and increasing the usage limitations of the scheme. Summary of the Utility Model

[0003] The utility model provides a protection circuit for a high-frequency filtering capacitor of a photovoltaic inverter, which can improve the over-temperature warning speed, over-temperature processing efficiency and processing accuracy of the high-frequency filtering capacitor.

[0004] To solve the above technical problems, in the first aspect of the utility model, a protection circuit for a high-frequency filtering capacitor of a photovoltaic inverter is disclosed. The circuit includes a high-frequency filtering module and a temperature protection module, wherein:

[0005] The first end of the high-frequency filtering module is used for electrically connecting with the output end of the photovoltaic inverter; the second end of the high-frequency filtering module is electrically connected with the first end of the temperature protection module; the second end of the temperature protection module is used for electrically connecting with the main body of the photovoltaic inverter;

[0006] The high-frequency filtering module is used for performing high-frequency filtering processing on the output signal transmitted by the photovoltaic inverter;

[0007] The temperature protection module is used for performing preset temperature control operations on the high-frequency filtering module and / or the photovoltaic inverter. The temperature control operations at least include temperature monitoring and signal encoding for the high-frequency filtering module; the temperature control operations also include over-temperature warning and / or over-temperature control for the high-frequency filtering module and / or the photovoltaic inverter.

[0008] As an optional implementation manner, in the first aspect of the utility model, the temperature protection module includes a temperature monitoring sub-module and an over-temperature processing sub-module, wherein;

[0009] The second end of the high-frequency filtering module is electrically connected to the first end of the temperature monitoring sub-module; the second end of the temperature monitoring sub-module is electrically connected to the first end of the over-temperature processing sub-module; the second end of the over-temperature processing sub-module is used to be electrically connected to the PV inverter main unit.

[0010] As an optional implementation manner, in the first aspect of the present utility model, the temperature monitoring sub-module is configured to monitor a target temperature signal corresponding to a module core in the high-frequency filtering module, and feedback the target temperature signal to the PV inverter main unit via the over-temperature processing sub-module;

[0011] The over-temperature processing sub-module is configured to encode the received target temperature signal, and feedback an encoded signal corresponding to the target temperature signal to the PV inverter main unit.

[0012] As an optional implementation manner, in the first aspect of the present utility model, the over-temperature processing sub-module is further configured to receive a control signal fed back by the PV inverter main unit for the encoded signal, and perform a preset temperature control on the PV inverter and / or the high-frequency filtering module according to the control signal;

[0013] Wherein, the temperature control includes start-stop control for the PV inverter and / or warning control for the high-frequency filtering module.

[0014] As an optional implementation manner, in the first aspect of the present utility model, the temperature monitoring sub-module includes a temperature monitoring switch, wherein:

[0015] The second end of the high-frequency filtering module is electrically connected to the first end of the temperature monitoring switch; the second end of the temperature monitoring switch is electrically connected to the first end of the over-temperature processing sub-module;

[0016] The temperature monitoring switch is configured to monitor a first temperature signal corresponding to a module core in the high-frequency filtering module, and feedback the first temperature signal to the PV inverter main unit via the over-temperature processing sub-module;

[0017] The temperature monitoring switch is further configured to perform switch closing and cutting control according to a control signal fed back by the PV inverter main unit for the first temperature signal, so as to control the start and stop of the high-frequency filtering module.

[0018] As an optional implementation manner, in the first aspect of the present utility model, the temperature monitoring sub-module includes a temperature monitoring resistor, wherein:

[0019] The second end of the high-frequency filtering module is electrically connected to the first end of the temperature monitoring resistor; the second end of the temperature monitoring resistor is electrically connected to the first end of the over-temperature processing sub-module;

[0020] The temperature monitoring resistor is configured to determine a second temperature signal corresponding to the high-frequency filtering module according to the high-frequency filtering signal corresponding to the output signal, and feedback the second temperature signal to the PV inverter host via the over-temperature processing sub-module;

[0021] The temperature monitoring resistor is further configured to perform resistance value adjustment according to the control signal fed back by the PV inverter host for the second temperature signal, so as to control the start and stop of the high-frequency filtering module.

[0022] As an optional implementation manner, in the first aspect of the present invention, the over-temperature processing sub-module includes an encoder, wherein:

[0023] The second end of the temperature monitoring sub-module is electrically connected to the first end of the encoder; the second end of the encoder is configured to be electrically connected to the PV inverter host.

[0024] As an optional implementation manner, in the first aspect of the present invention, the encoder is configured to receive the target temperature signal, identify the target temperature signal, and obtain the module number corresponding to the high-frequency filtering module that transmits the target temperature signal;

[0025] The encoder is further configured to perform encoding on the target temperature signal according to the module number and the preset signal transmission requirements, and transmit the corresponding encoded signal to the PV inverter host.

[0026] As an optional implementation manner, in the first aspect of the present invention, the high-frequency filtering module is a high-frequency filtering capacitor.

[0027] The second aspect of the present invention discloses an over-temperature protection device, which includes a device main body, and the over-temperature protection device includes a protection circuit for a high-frequency filtering capacitor of a PV inverter as disclosed in any one of the first aspect of the present invention.

[0028] Implementing the present invention has the following beneficial effects:

[0029] In the present utility model, a protection circuit for a high-frequency filtering capacitor of a photovoltaic inverter is provided. The circuit includes a high-frequency filtering module and a temperature protection module, where: the first end of the high-frequency filtering module is used for electrically connecting to the output end of the photovoltaic inverter; the second end of the high-frequency filtering module is electrically connected to the first end of the temperature protection module; the second end of the temperature protection module is used for electrically connecting to the main unit of the photovoltaic inverter; the high-frequency filtering module is used for performing high-frequency filtering processing on the output signal transmitted by the photovoltaic inverter; the temperature protection module is used for performing a preset temperature control operation on the high-frequency filtering module and / or the photovoltaic inverter. The temperature control operation at least includes temperature monitoring and signal encoding for the high-frequency filtering module; the temperature control operation also includes over-temperature warning and / or over-temperature control for the high-frequency filtering module and / or the photovoltaic inverter. It can be seen that in the present utility model, through the provided temperature protection module, the internal temperature signal corresponding to the high-frequency filtering capacitor can be intelligently monitored, and then the internal temperature signal is encoded and transmitted to the inverter main unit. The inverter main unit performs a matching temperature control operation according to the internal temperature signal. Different from the traditional temperature protection scheme, the temperature warning function for the high-frequency filtering capacitor is realized, as well as the rapid cut-off of over-temperature, which is beneficial to improving the over-temperature protection accuracy and safety of the high-frequency filtering capacitor, reducing the failure rate of the high-frequency filtering capacitor, and then being beneficial to improving the service life of the high-frequency filtering capacitor. Brief Description of the Drawings

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the drawings required to be used in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained according to these drawings.

[0031] Figure 1 is a schematic structural diagram of a protection circuit for a high-frequency filtering capacitor of a photovoltaic inverter disclosed in an embodiment of the present utility model;

[0032] Figure 2 is a schematic structural diagram of another protection circuit for a high-frequency filtering capacitor of a photovoltaic inverter disclosed in an embodiment of the present utility model;

[0033] Figure 3 is a schematic structural diagram of yet another protection circuit for a high-frequency filtering capacitor of a photovoltaic inverter disclosed in an embodiment of the present utility model;

[0034] Figure 4 is a schematic structural diagram of another protection circuit for a high-frequency filtering capacitor of a photovoltaic inverter disclosed in an embodiment of the present utility model;

[0035] Figure 5It is a schematic structural diagram of an overtemperature protection device disclosed in an embodiment of the present utility model. Detailed implementation manners

[0036] For better understanding and implementation, the technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0037] It should be noted that unless otherwise clearly defined and limited, the term "electrically connected" in the description and claims of the present utility model and the above accompanying drawings should be understood in a broad sense. For example, it may be a fixed electrical connection, a detachable electrical connection, or an integral electrical connection; it may be a mechanical electrical connection, an electrical connection, or communication with each other; it may be directly connected, or indirectly connected through an intermediate medium, and may be the connection inside two components or the interaction relationship between two components. In addition, the terms "first", "second", etc. in the description and claims of the present utility model and the above accompanying drawings are used to distinguish different objects, rather than to describe a specific order. The terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0038] Embodiment 1

[0039] Please refer to Figure 1 , Figure 1 which is a schematic structural diagram of a protection circuit for a high-frequency filtering capacitor of a photovoltaic inverter disclosed in an embodiment of the present utility model. This circuit can be applied to a photovoltaic inverter and is used as a filtering and protection device on the output side of the photovoltaic inverter. The embodiments of the present utility model do not make limitations. As Figure 1 shown, the protection circuit 10 for the high-frequency filtering capacitor of the photovoltaic inverter includes a high-frequency filtering module 101 and a temperature protection module 102, where:

[0040] The first end of the high-frequency filtering module 101 is used to be electrically connected to the output end 20 of the photovoltaic inverter; the second end of the high-frequency filtering module 101 is electrically connected to the first end of the temperature protection module 102; the second end of the temperature protection module 102 is used to be electrically connected to the main body 30 of the photovoltaic inverter;

[0041] The high-frequency filtering module 101 is used to perform high-frequency filtering processing on the output signal transmitted by the photovoltaic inverter 20;

[0042] The temperature protection module 102 is used to perform a preset temperature control operation on the high-frequency filtering module 101 and / or the photovoltaic inverter 20. The temperature control operation at least includes temperature monitoring and signal encoding for the high-frequency filtering module 101. The temperature control operation also includes over-temperature warning and / or over-temperature control for the high-frequency filtering module 101 and / or the photovoltaic inverter 20.

[0043] It can be seen that by implementing Figure 1 the described protection circuit for the high-frequency filtering capacitor of the photovoltaic inverter, the temperature protection module can intelligently monitor the internal temperature signal corresponding to the high-frequency filtering capacitor, and then perform encoding processing on the internal temperature signal and transmit it to the inverter host. The inverter host performs a matching temperature control operation according to the internal temperature signal. Different from the traditional temperature protection scheme, it realizes the temperature warning function for the high-frequency filtering capacitor and the rapid cut-off of over-temperature, which is beneficial to improving the over-temperature protection accuracy and safety of the high-frequency filtering capacitor, reducing the failure rate of the high-frequency filtering capacitor, and then being beneficial to improving the service life of the high-frequency filtering capacitor.

[0044] In an alternative embodiment, as Figure 2 shown, Figure 2 FIG. is a schematic structural diagram of another protection circuit for the high-frequency filtering capacitor of the photovoltaic inverter disclosed in the embodiment of the present invention. As Figure 2 shown, the temperature protection module 102 includes a temperature monitoring sub-module 1021 and an over-temperature processing sub-module 1022, where;

[0045] The second end of the high-frequency filtering module 101 is electrically connected to the first end of the temperature monitoring sub-module 1021; the second end of the temperature monitoring sub-module 1021 is electrically connected to the first end of the over-temperature processing sub-module 1022; the second end of the over-temperature processing sub-module 1022 is used to be electrically connected to the photovoltaic inverter host 30.

[0046] In this alternative embodiment, the temperature monitoring sub-module 1021 is used to monitor the target temperature signal corresponding to the module core in the high-frequency filtering module 101, and feedback the target temperature signal to the photovoltaic inverter host 30 via the over-temperature processing sub-module 1022;

[0047] The over-temperature processing sub-module 1022 is used to encode the received target temperature signal and feedback the encoded signal corresponding to the target temperature signal to the photovoltaic inverter host 30.

[0048] In this alternative embodiment, by providing a circuit that can implement intelligent acquisition and monitoring of the corresponding module temperature (target temperature signal) of the high-frequency filtering module through the built-in temperature monitoring sub-module, it is beneficial to improve the real-time performance and accuracy of temperature monitoring for the high-frequency filtering module. Subsequently, the collected target temperature signal is encoded and transmitted, and the host of the photovoltaic inverter analyzes the encoded signal of the target temperature signal, improving the efficiency and accuracy of analyzing and processing the target temperature signal, thereby facilitating the improvement of the applicability of the circuit.

[0049] In this alternative embodiment, optionally, the over-temperature processing sub-module 1022 is further configured to receive the control signal fed back by the host of the photovoltaic inverter 30 for the encoded signal, and perform preset temperature control on the photovoltaic inverter 20 and / or the high-frequency filtering module 101 according to the control signal;

[0050] Among them, the temperature control includes start-stop control for the photovoltaic inverter 20 and / or warning control for the high-frequency filtering module 101.

[0051] In this alternative embodiment, by providing an over-temperature processing sub-module that can promptly respond to the control signal fed back by the host, it is beneficial to improve the response accuracy and response speed for the control signal. Further, for this control signal, at least start-stop control for the photovoltaic inverter 20 and / or warning control for the high-frequency filtering module 101 are set, improving the processing timeliness and accuracy of the over-temperature situation existing in the high-frequency filtering module of the circuit, and facilitating the improvement of the applicability of the overall circuit.

[0052] In another alternative embodiment, as Figure 2 shown, the temperature monitoring sub-module 1021 includes a temperature monitoring switch K1, where:

[0053] The second end of the high-frequency filtering module 101 is electrically connected to the first end of the temperature monitoring switch K1; the second end of the temperature monitoring switch K1 is electrically connected to the first end of the over-temperature processing sub-module 1022;

[0054] The temperature monitoring switch K1 is configured to monitor the first temperature signal corresponding to the module core in the high-frequency filtering module 101, and feed the first temperature signal to the host of the photovoltaic inverter 30 via the over-temperature processing sub-module 1022;

[0055] The temperature monitoring switch K1 is further configured to perform switch closing and cutting control according to the control signal fed back by the host of the photovoltaic inverter 30 for the first temperature signal to control the start and stop of the high-frequency filtering module 101.

[0056] In this alternative embodiment, by means of the temperature monitoring switch provided in the temperature monitoring sub-module, while realizing the intelligent monitoring of the temperature data of the high-frequency filtering module, it is also possible to, through this temperature monitoring switch, upon receiving the control signal fed back by the host, promptly execute the switch closing and switching control, achieving the control accuracy and timeliness of the startup and cut-off of the high-frequency filtering module, and further improving the applicability of the circuit.

[0057] In yet another alternative embodiment, as Figure 3 shown, the temperature monitoring sub-module 1021 includes a temperature monitoring resistor R1, where:

[0058] The second end of the high-frequency filtering module 101 is electrically connected to the first end of the temperature monitoring resistor R1; the second end of the temperature monitoring resistor R1 is electrically connected to the first end of the over-temperature processing sub-module 1022;

[0059] The temperature monitoring resistor R1 is used to determine the second temperature signal corresponding to the high-frequency filtering module 101 according to the high-frequency filtering signal corresponding to the output signal, and feed back the second temperature signal to the photovoltaic inverter host 30 via the over-temperature processing sub-module 1022;

[0060] The temperature monitoring resistor R1 is further used to execute resistance value adjustment according to the control signal fed back by the photovoltaic inverter host 30 for the second temperature signal, so as to control the startup and stop of the high-frequency filtering module 101.

[0061] In this alternative embodiment, different from the temperature monitoring switch provided in the temperature monitoring sub-module above, the method of setting a temperature monitoring resistor is adopted here. After the temperature monitoring sub-module receives the control signal fed back by the host, by adjusting the temperature monitoring resistor to different resistance values, the startup and stop of the high-frequency filtering module are controlled. Since the change in the resistance value of the temperature monitoring resistor is smoother and more stable, it is beneficial to improve the stability and reliability of the startup and stop control of the high-frequency filtering module.

[0062] In yet another alternative embodiment, as Figure 2 or Figure 3 shown, the over-temperature processing sub-module 1022 includes an encoder, where:

[0063] The second end of the temperature monitoring sub-module 1021 is electrically connected to the first end of the encoder; the second end of the encoder is used to be electrically connected to the photovoltaic inverter host 30.

[0064] In this alternative embodiment, the encoder is used to receive the target temperature signal and identify the target temperature signal to obtain the module number corresponding to the high-frequency filtering module 101 that transmits the target temperature signal;

[0065] The encoder is also used to encode the target temperature signal according to the module number and the preset signal transmission requirements, and transmit the corresponding encoded signal to the PV inverter host 30.

[0066] In this alternative embodiment, encoding the target temperature signal through the provided encoder helps reduce the interference suffered by the target temperature signal during transmission, and thus helps improve the transmission accuracy and reliability of the target temperature signal.

[0067] In yet another alternative embodiment, as Figure 2 or Figure 3 shown, the high-frequency filtering module 101 is a high-frequency filtering capacitor. By thus setting a commonly used high-frequency filtering capacitor in the high-frequency filtering module, the functions of filtering out high-frequency harmonics, stabilizing the output voltage and current, protecting the equipment, and improving the system performance are achieved, which is conducive to improving the applicability of the overall circuit.

[0068] In yet another alternative embodiment, as Figure 4 shown, Figure 4 two parallel protection circuits for the high-frequency filtering capacitors of the PV inverter are given. However, in fact, the number of protection circuits for the high-frequency filtering capacitors of the PV inverter may not be just two, and more protection circuits for the high-frequency filtering capacitors of the PV inverter can be paralleled according to the actual situation. Generally, the upper limit is set to 12. It should be noted that Figure 4 the meaning of expandable parallel connection is that the same protection circuits for the high-frequency filtering capacitors of the PV inverter can be paralleled at other output ports of the PV inverter host 30 in Figure 4 this.

[0069] It can be seen that implementing Figure 4 the described protection circuit for the high-frequency filtering capacitors of the PV inverter can receive the temperature signals corresponding to 1 - 12 high-frequency filtering capacitors / capacitors at most by paralleling multiple similar protection circuits for the high-frequency filtering capacitors of the PV inverter according to the actual needs, so that the host can uniformly analyze and process the temperature signals, making full use of the computing resources of the host, which is conducive to improving the supervision efficiency of the host for the high-frequency filtering capacitors / capacitors and reducing the occurrence of the high-frequency filtering capacitors / capacitors in the circuit being burned out or damaged.

[0070] The working principle of the protection circuit for the high-frequency filtering capacitors of the PV inverter in the embodiments of the present utility model is as follows:

[0071] In the embodiment of the present utility model, a temperature protection module capable of monitoring / collecting the internal temperature signal of the high-frequency filtering module (actually a high-frequency filtering capacitor) is introduced into the high-frequency filtering module. The temperature protection module collects and monitors the temperature corresponding to the high-frequency filtering module, then encodes the collected temperature signal and transmits it to the corresponding processing host of the photovoltaic inverter. The host decodes and analyzes the encoded temperature signal to realize the intelligent monitoring of the current module temperature of the high-frequency filtering module. When it is detected that the module temperature reaches the set warning temperature, the host generates a corresponding control signal and transmits it back to the temperature protection module. The temperature protection module performs a matching temperature control operation according to the control signal, thereby realizing over-temperature warning and / or over-temperature control for the high-frequency filtering module and / or the photovoltaic inverter.

[0072] It should be noted that the above principle description is for a protection circuit for the high-frequency filtering capacitor of a photovoltaic inverter. For the principles of multiple protection circuits for the high-frequency filtering capacitors of a photovoltaic inverter, please refer to the specific description of the principle of a protection circuit for the high-frequency filtering capacitor of a photovoltaic inverter above, and details will not be repeated here.

[0073] Embodiment 2

[0074] Please refer to Figure 5 , Figure 5 which is a schematic structural diagram of an over-temperature protection device disclosed in the embodiment of the present utility model. The over-temperature protection device includes any one of the protection circuits for the high-frequency filtering capacitor of a photovoltaic inverter as in Embodiment 1. And the over-temperature protection device includes, but is not limited to, devices / equipment such as photovoltaic inverters for output filtering and over-temperature protection. It should be noted that for the detailed description of the over-temperature protection device, please refer to the specific description of the relevant content in Embodiment 1, and details will not be repeated in this embodiment.

[0075] It can be seen that for the over-temperature protection device described in Figure 5 , through the set temperature protection module, the internal temperature signal corresponding to the high-frequency filtering capacitor can be intelligently monitored, then the internal temperature signal is encoded and transmitted to the inverter host. The inverter host performs a matching temperature control operation according to the internal temperature signal. Different from the traditional temperature protection scheme, it realizes the temperature warning function for the high-frequency filtering capacitor and the rapid cut-off of over-temperature, which is beneficial to improving the over-temperature protection accuracy and safety of the high-frequency filtering capacitor, reducing the failure rate of the high-frequency filtering capacitor, and thus beneficial to improving the service life of the high-frequency filtering capacitor.

[0076] The above has introduced in detail a protection circuit for high-frequency filter capacitors of a photovoltaic inverter and an over-temperature protection device disclosed in the embodiments of the present utility model. Specific embodiments are used herein to elaborate on the principle and implementation manner of the present utility model. However, the above preferred embodiments are not intended to limit the present utility model. The description of the above embodiments is only used to help understand the method and its core idea of the present utility model. At the same time, for those of ordinary skill in the art, based on the idea of the present utility model, without departing from the spirit and scope of the present utility model, there will be changes in the specific implementation manner and application scope. Therefore, the protection scope of the present utility model shall be subject to the scope defined by the claims.

Claims

1. A protection circuit for a high-frequency filtering capacitor of a photovoltaic inverter, characterized in that, The circuit includes a high-frequency filtering module and a temperature protection module, where: The first end of the high-frequency filtering module is used for electrically connecting to the output end of the photovoltaic inverter; the second end of the high-frequency filtering module is electrically connected to the first end of the temperature protection module; the second end of the temperature protection module is used for electrically connecting to the main body of the photovoltaic inverter; The high-frequency filtering module is used for performing high-frequency filtering processing on the output signal transmitted by the photovoltaic inverter; The temperature protection module is used for performing preset temperature control operations on the high-frequency filtering module and / or the photovoltaic inverter. The temperature control operations at least include temperature monitoring and signal encoding for the high-frequency filtering module; the temperature control operations also include over-temperature warning and / or over-temperature control for the high-frequency filtering module and / or the photovoltaic inverter.

2. The protection circuit for the high-frequency filtering capacitor of a photovoltaic inverter according to claim 1, wherein, The temperature protection module includes a temperature monitoring sub-module and an over-temperature processing sub-module, where; The second end of the high-frequency filtering module is electrically connected to the first end of the temperature monitoring sub-module; the second end of the temperature monitoring sub-module is electrically connected to the first end of the over-temperature processing sub-module; the second end of the over-temperature processing sub-module is used for electrically connecting to the main body of the photovoltaic inverter.

3. The protection circuit for the high-frequency filtering capacitor of a photovoltaic inverter according to claim 2, wherein The temperature monitoring sub-module is used for monitoring the target temperature signal corresponding to the module core in the high-frequency filtering module, and feeding back the target temperature signal to the main body of the photovoltaic inverter via the over-temperature processing sub-module; The over-temperature processing sub-module is used for encoding the received target temperature signal, and feeding back the encoded signal corresponding to the target temperature signal to the main body of the photovoltaic inverter.

4. The protection circuit for a high-frequency filtering capacitor of a photovoltaic inverter according to claim 3, wherein, The over-temperature processing sub-module is further used for receiving the control signal fed back by the main body of the photovoltaic inverter for the encoded signal, and performing preset temperature control on the photovoltaic inverter and / or the high-frequency filtering module according to the control signal; Wherein, the temperature control includes start-stop control for the photovoltaic inverter and / or warning control for the high-frequency filtering module.

5. The protection circuit for a high-frequency filtering capacitor of a photovoltaic inverter according to claim 2, wherein, The temperature monitoring sub-module includes a temperature monitoring switch, where: The second end of the high-frequency filtering module is electrically connected to the first end of the temperature monitoring switch; the second end of the temperature monitoring switch is electrically connected to the first end of the over-temperature processing sub-module; The temperature monitoring switch is used for monitoring the first temperature signal corresponding to the module core in the high-frequency filtering module, and feeding back the first temperature signal to the main body of the photovoltaic inverter via the over-temperature processing sub-module; The temperature monitoring switch is further used for performing switch closing and cutting control according to the control signal fed back by the main body of the photovoltaic inverter for the first temperature signal, so as to control the start and stop of the high-frequency filtering module.

6. The protection circuit for a high-frequency filtering capacitor of a photovoltaic inverter according to claim 2, wherein The temperature monitoring sub-module includes a temperature monitoring resistor, where: The second end of the high-frequency filtering module is electrically connected to the first end of the temperature monitoring resistor; the second end of the temperature monitoring resistor is electrically connected to the first end of the over-temperature processing sub-module; The temperature monitoring resistor is configured to determine a second temperature signal corresponding to the high-frequency filtering module according to the high-frequency filtering signal corresponding to the output signal, and feedback the second temperature signal to the photovoltaic inverter host via the over-temperature processing sub-module; The temperature monitoring resistor is further configured to perform resistance value adjustment according to a control signal fed back by the photovoltaic inverter host for the second temperature signal, so as to control the start and stop of the high-frequency filtering module.

7. The protection circuit for a high-frequency filtering capacitor of a photovoltaic inverter according to claim 3 or 4, characterized in that, The over-temperature processing sub-module includes an encoder, wherein: The second end of the temperature monitoring sub-module is electrically connected to the first end of the encoder; the second end of the encoder is used to be electrically connected to the photovoltaic inverter host.

8. The protection circuit for the high-frequency filtering capacitor of a photovoltaic inverter according to claim 7, characterized in that, The encoder is configured to receive the target temperature signal and identify the target temperature signal to obtain the module number corresponding to the high-frequency filtering module that transmits the target temperature signal; The encoder is further configured to encode the target temperature signal according to the module number and a preset signal transmission requirement, and transmit the corresponding encoded signal to the photovoltaic inverter host.

9. The protection circuit for a high-frequency filtering capacitor of a photovoltaic inverter according to claim 1 or 2 or 3 or 4 or 5 or 6 or 8, characterized in that, The high-frequency filtering module is a high-frequency filtering capacitor.

10. An over-temperature protection device, characterized in that, The over-temperature protection device includes a device main body, and the over-temperature protection device includes a protection circuit for the high-frequency filtering capacitor of the photovoltaic inverter as described in any one of claims 1-9.

Images