Power converter and fault indication method thereof

Abstract

The embodiment of the invention provides a power converter and a fault indication method thereof. The power converter comprises a power conversion circuit; the breaking switch is connected to the power conversion circuit; the controller is used for controlling the breaking switch; the state latch circuit is used for latching a state signal; wherein the state signal is used for indicating whether the breaking switch receives a tripping driving signal or not. According to the power converter and the fault indication method thereof, convenience can be brought to positioning of fault causes of the power converter to a certain extent.

Description

Technical Field

[0001] The embodiments in this application relate to the field of power electronics technology, specifically to a power converter and its fault indication method. Background Technology

[0002] In related technologies, some abnormal faults may occur during the operation of power converters, causing the disconnect switch to fail to trip or trip erroneously, affecting the normal operation of the power converter.

[0003] Maintenance personnel need to quickly and accurately locate the cause of the fault in cases where the disconnect switch fails to trip or trips erroneously, in order to carry out appropriate maintenance. Summary of the Invention

[0004] This application provides a power converter and a fault indication method thereof, which can facilitate the location of fault causes in the power converter to a certain extent.

[0005] In a first aspect, embodiments of this application provide a power converter, including: a power conversion circuit; a disconnect switch connected to the power conversion circuit; a controller for controlling the disconnect switch; and a state latching circuit for latching a state signal; wherein the state signal is used to indicate whether the disconnect switch has received a trip drive signal.

[0006] Optionally, the power converter includes a switch driving circuit for driving the disconnect switch; a voltage threshold circuit is provided between the state latch circuit and the switch driving circuit, the voltage threshold circuit can obtain the trip driving signal issued by the switch driving circuit; the voltage threshold circuit allows an electrical signal whose signal voltage meets the voltage threshold condition to be input to the state latch circuit; wherein, the trip driving signal output by the switch driving circuit meets the voltage threshold condition.

[0007] Optionally, the power converter includes a switch driving circuit for driving the disconnect switch; a delay filter circuit is provided between the state latch circuit and the switch driving circuit, the delay filter circuit can obtain the trip drive signal output by the switch driving circuit; the delay filter circuit allows electrical signals whose duration exceeds a threshold duration to be input to the state latch circuit; wherein, the duration of the trip drive signal output by the switch driving circuit exceeds the threshold duration.

[0008] Optionally, the power converter is further provided with a status indication circuit, which is used to output the status signal latched in the status latch circuit.

[0009] Optionally, the status signal includes: a first status signal indicating that the disconnect switch has received a tripping drive signal, or a second status signal indicating that the disconnect switch has not received a tripping drive signal; if the controller issues a control signal to control the disconnect switch to disconnect, the disconnect switch does not trip, and the status signal is the first status signal, it indicates that the disconnect switch has malfunctioned; or, if the controller issues a control signal to control the disconnect switch to disconnect, the disconnect switch does not trip, and the status signal is the second status signal, it indicates that there is a fault between the disconnect switch and the controller; or, if the controller does not record a control signal, the disconnect switch trips, and the status signal is the first status signal, it indicates that there is a fault between the disconnect switch and the controller; or, if the controller does not record a control signal, the disconnect switch trips, and the status signal is the second status signal, it indicates that the disconnect switch has malfunctioned.

[0010] Optionally, the state latching circuit has a power supply independent of the controller.

[0011] Secondly, embodiments of this application provide a fault indication method for a power converter, comprising: latching a status signal through a status latching circuit; wherein the status signal is used to indicate whether the disconnecting switch of the power converter has received a tripping drive signal.

[0012] Optionally, the method further includes: obtaining an electrical signal output by the switch driving circuit through a voltage threshold circuit; and allowing the electrical signal to be input to the state latch circuit if the signal voltage of the electrical signal meets the voltage threshold condition of the voltage threshold circuit; wherein the signal voltage of the break-out driving signal output by the switch driving circuit meets the voltage threshold condition.

[0013] Optionally, the method further includes: obtaining an electrical signal output by the switch driving circuit through a delay filtering circuit; and allowing the electrical signal to be input to the state latching circuit if the duration of the electrical signal exceeds the threshold duration of the delay filtering circuit; wherein the duration of the jump-off driving signal output by the switch driving circuit exceeds the threshold duration.

[0014] Optionally, the method further includes: outputting the state signal latched in the state latching circuit through a state indication circuit.

[0015] Optionally, the status signal includes: a first status signal indicating that the disconnect switch has received a tripping drive signal, or a second status signal indicating that the disconnect switch has not received a tripping drive signal; if the controller issues a control signal to control the disconnect switch to disconnect, the disconnect switch does not trip, and the status signal is the first status signal, it indicates that the disconnect switch has malfunctioned; or, if the controller issues a control signal to control the disconnect switch to disconnect, the disconnect switch does not trip, and the status signal is the second status signal, it indicates that there is a fault between the disconnect switch and the controller; or, if the controller does not record a control signal, the disconnect switch trips, and the status signal is the first status signal, it indicates that there is a fault between the disconnect switch and the controller; or, if the controller does not record a control signal, the disconnect switch trips, and the status signal is the second status signal, it indicates that the disconnect switch has malfunctioned.

[0016] In several embodiments provided in this application, by setting a state latching circuit in the power converter and latching the state signal representing the state of the disconnect switch, when the disconnect switch experiences abnormal situations such as false tripping or failure to trip, the state signal can accurately indicate whether the disconnect switch has received a tripping drive signal, which facilitates the staff in locating the cause of the power converter failure. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of a power converter provided for the first embodiment of this application.

[0019] Figure 2 This is a schematic diagram of a power converter provided for a second embodiment of this application.

[0020] Figure 3 This is a schematic diagram of a voltage threshold circuit provided for one embodiment of this application.

[0021] Figure 4 This is a schematic diagram of a power converter provided for a third embodiment of this application.

[0022] Figure 5This is a schematic diagram of a delay filter circuit provided in one embodiment of this application.

[0023] Figure 6 This is a schematic diagram of a power converter provided for the fourth embodiment of this application.

[0024] Figure 7 This is a schematic diagram of a power converter provided for the fifth embodiment of this application. Detailed Implementation

[0025] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0026] In the description of the embodiments of this application, it should be understood that 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 indicated technical features. Therefore, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0027] Please see Figure 1 One embodiment of this application provides a power converter. The power converter may include: a power conversion circuit; a disconnect switch connected to the power conversion circuit; a controller for controlling the disconnect switch; and a status latch circuit for latching a status signal; wherein the status signal is used to indicate whether the disconnect switch has received a trip drive signal.

[0028] In this embodiment, a power converter is a device in an electronic system used to convert electrical energy. Specifically, a power converter can transform power from the input side to the output side. Power converters can be applied in power transmission systems, photovoltaic power generation systems, energy storage systems, electric vehicle charging stations, and industrial equipment to meet the operational requirements of the equipment. For example, power converters may include, but are not limited to, DC-DC converters, DC-AC inverters, AC-DC rectifiers, and AC-AC frequency converters.

[0029] Power conversion circuits can be used to specifically convert electrical energy. In this embodiment, the power conversion circuit may include multiple semiconductor switching devices and control circuits to achieve relatively accurate control of the electrical energy conversion process. For example, in a photovoltaic system, the power conversion circuit can convert the direct current output from the photovoltaic panel into alternating current for use by the power grid. Alternatively, in an energy storage system, the power converter can achieve bidirectional power flow, switching between battery charging and discharging. Of course, in some embodiments, the power conversion circuit may also include a transformer.

[0030] In this embodiment, during power transmission in the power conversion circuit, the controller can accurately control the power transmission path and the on / off state of the switching devices in the power conversion circuit, ensuring the normal operation of the power converter. The disconnect switch is connected to the power conversion circuit and can disconnect or connect the circuit under the control of the controller. The disconnect switch can be a mechanical circuit breaker or an electronic switch to adapt to different usage scenarios. For example, when the controller detects a short circuit, overload, or overtemperature fault in the power converter, it can control the disconnect switch to trip to protect the power converter.

[0031] In this embodiment, the controller can be used to control the disconnect switch. Specifically, the controller can directly send a control signal to the disconnect switch, and when the disconnect switch receives the control signal, it can close or open according to the actual settings. In some embodiments, if the disconnect switch is a mechanical circuit breaker, the disconnect switch can only respond to the control signal to disconnect the circuit. In some embodiments, if the disconnect switch is an electronic switch, the controller can control the electronic switch to trip or close. Of course, in some embodiments, the power converter may also include a switch drive circuit. The switch drive circuit can be used to receive the control signal sent by the controller and perform control of the disconnect switch based on the received control signal.

[0032] In this embodiment, the controller can control the disconnect switch by sending a control signal to it based on the operating status of the power converter. Specifically, the controller can detect an abnormality or fault in the power converter based on pre-set judgment conditions, and actively send a control signal to the disconnect switch to trip, thus protecting the overall circuit safety. In some embodiments, the controller directly sends a control signal to the disconnect switch; in this case, the control signal can be directly used as a tripping drive signal to control the disconnect switch to trip. In some embodiments, the controller sends a control signal to the switch drive circuit, which then sends a tripping drive signal to the disconnect switch.

[0033] In this embodiment, the controller can generate log data recording the working process during operation. In this embodiment, when the controller issues a control signal to the disconnect switch, the corresponding control event will also be recorded in the log data.

[0034] In this embodiment, the state latch circuit can be used to latch a state signal representing the state of the switch drive circuit. The state signal of the state latch circuit can directly originate from the trip drive signal received by the disconnect switch. Alternatively, it can be generated internally by the state latch circuit after it receives the trip drive signal. Specifically, the state of the disconnect switch can be divided into receiving a trip drive signal and not receiving a trip drive signal. For example, when a trip drive signal is received, the disconnect switch can trip using its own operating mechanism. Distinguishing the state of the disconnect switch through the state signal facilitates analysis of the specific cause of a power converter failure. For example, the state signal can be high-level or low-level to indicate whether the disconnect switch has received a trip drive signal. Furthermore, the state latch circuit can have an initial state, where the latched state signal is a low level, indicating that the disconnect switch has not received a trip drive signal. After the disconnect switch receives a trip drive signal, the state latch circuit can obtain the trip drive signal and change the latched state signal accordingly, for example, changing the latched state signal to a high level. In some embodiments, for example, the state latching circuit may employ a magnetic latching relay, an SR latch (set-reset latch), or a flux latch.

[0035] In this embodiment, after the state signal latched by the state latch circuit changes, it will not change again until it is reset. Thus, the state signal in the state latch circuit can accurately distinguish whether the disconnect switch has received a tripping drive signal. In practical applications, when the disconnect switch fails to trip or trips erroneously, the state signal of the state latch circuit can conveniently indicate the cause of the fault. For example, if the state signal indicates that the disconnect switch received a tripping drive signal but did not trip, it may be due to a mechanical fault in the disconnect switch itself. If the state signal indicates that the disconnect switch did not receive a tripping drive signal but tripped, it may be due to signal interference or an unexpected fault in the disconnect switch itself. In this embodiment, operators can quickly and accurately determine the source of the fault through the state signal of the state latch circuit, facilitating targeted maintenance measures.

[0036] In some embodiments, please refer to Figure 2The power converter includes a switch driving circuit for driving the disconnect switch; a voltage threshold circuit is provided between the state latch circuit and the switch driving circuit, the voltage threshold circuit can obtain the trip drive signal issued by the switch driving circuit; the voltage threshold circuit allows an electrical signal whose signal voltage meets the voltage threshold condition to be input to the state latch circuit; wherein, the signal voltage of the trip drive signal output by the switch driving circuit meets the voltage threshold condition.

[0037] In this embodiment, by setting a voltage threshold circuit, the electrical signal can only pass through the voltage threshold circuit and be input to the state latch circuit when the signal voltage of the electrical signal output by the switch drive circuit meets the voltage threshold condition. This ensures that the state latch circuit responds to valid control signals, filtering out voltage signals that may be caused by interference or noise, thereby reducing the possibility of false latching. In this embodiment, the voltage threshold circuit can be arranged so that the input electrical signal must meet the voltage threshold condition before it is output. Specifically, the voltage threshold condition can be that the voltage of the electrical signal exceeds a threshold voltage, or that the voltage of the electrical signal is less than a threshold voltage, or that the voltage of the electrical signal is equal to the threshold voltage. For example, when the controller detects a fault in the power converter, it sends a control signal to the switch drive circuit, at which point the switch drive circuit outputs a trip drive signal to the disconnect switch. The trip drive signal voltage is higher than a predetermined threshold voltage. At this point, the trip drive signal meets the voltage threshold condition and can be input to the state latch circuit through the voltage threshold circuit. The state latch circuit then latches the corresponding state signal, indicating that the trip switch has received the trip drive signal. If interference or noise signals with voltages lower than the threshold voltage appear on the power converter's lines, the voltage threshold circuit will prevent these signals from entering the state latch circuit, reducing the possibility of false latching and thus improving the accuracy of the state signal.

[0038] In one specific embodiment, please refer to Figure 3The voltage threshold circuit can be implemented using a combination of a comparator and a voltage regulator. The voltage regulator outputs a stable threshold voltage to the comparator. The comparator compares the input electrical signal voltage with the threshold voltage. If the input electrical signal voltage is greater than the threshold voltage, the comparator outputs an electrical signal. For example, after a trip drive signal is input to the comparator, because the trip drive signal voltage is greater than the threshold voltage, the comparator outputs a trip drive signal to the state latch circuit. Of course, this embodiment only provides one example of a voltage threshold circuit. Those skilled in the art can make other modifications or use other circuit structures based on the essence of this application, but as long as the function and effect are the same as or similar to the voltage threshold circuit, they should be covered within the scope of protection of this application.

[0039] In some embodiments, please refer to Figure 4 A delay filter circuit is provided between the state latch circuit and the switch drive circuit. The delay filter circuit can obtain the breakout drive signal output by the switch drive circuit. The delay filter circuit allows electrical signals whose duration exceeds a threshold duration to be input to the state latch circuit. The duration of the breakout drive signal output by the switch drive circuit exceeds the threshold duration.

[0040] In this embodiment, the delay filter circuit ensures that the electrical signal can only pass through the delay filter circuit and be input to the state latch circuit when the duration of the electrical signal exceeds a threshold duration. Thus, the state latch circuit can respond to valid electrical signals with a sufficiently long duration, filtering out short-duration pulse signals that may be caused by interference or noise, thereby preventing false latching. Specifically, when the controller detects a fault in the power converter, it sends a control signal to the switch drive circuit, which then outputs a trip drive signal to the disconnect switch. The duration of the trip drive signal is longer than a predetermined threshold duration, allowing it to pass through the delay filter circuit and be input to the state latch circuit. Upon receiving the trip drive signal, the state latch circuit latches the corresponding state signal, indicating that the disconnect switch has received the trip drive signal. If interference signals or noise pulses with a duration shorter than the threshold duration appear on the power converter line, the delay filter circuit will prevent these electrical signals from entering the state latch circuit, avoiding false latching.

[0041] In one specific embodiment, please refer to Figure 4 and 5The specific implementation of the time-delay filter circuit can include an RC (resistor-capacitor) charging circuit and a controlled electronic switch. For example, when the time-delay filter circuit receives a short-time pulse signal as input, the output voltage of the RC charging circuit after receiving the short-time pulse signal does not reach the threshold that would enable the controlled electronic switch to conduct, thus keeping the controlled electronic switch in the off state and not generating a valid input to the state latching circuit. When the time-delay filter circuit receives a trip drive signal as input, the voltage input to the controlled electronic switch by the RC charging circuit under the action of the trip drive signal reaches the threshold that would enable the controlled electronic switch to conduct. At this time, the controlled electronic switch conducts, realizing that the time-delay filter circuit generates a valid input to the state latching circuit, causing the state latching circuit to perform latching of the corresponding state signal. The controlled electronic switch includes, but is not limited to, transistors, power semiconductor MOSFETs, IGBTs, etc. Of course, this embodiment only provides one example of a time-delay filter circuit. Those skilled in the art can make other modifications or use other circuit structures based on the essence of the technology in this application, but as long as the function and effect achieved are the same as or similar to the time-delay filter circuit, they should all be covered within the scope of protection of this application.

[0042] In some embodiments, please refer to Figure 6 A voltage threshold circuit and a delay filter circuit are provided between the state latch circuit and the switch drive circuit. The order of the voltage threshold circuit and the delay filter circuit is not limited. For example, the output of the voltage threshold circuit can be used as the input of the delay filter circuit. Alternatively, the output of the delay filter circuit can be used as the input of the voltage threshold circuit.

[0043] In some embodiments, please refer to Figure 7 The power converter is also provided with a status indication circuit, which is used to output the status signal latched in the status latch circuit.

[0044] In this embodiment, the power converter is also equipped with a status indication circuit. The status indication circuit outputs the status signal latched in the status latching circuit, allowing maintenance personnel or the monitoring system to easily obtain the status signal. The status indication circuit can present the status signal in a visual manner, such as through indicator lights, a display screen, or a communication interface. Specifically, when the disconnect switch fails to trip or trips erroneously, the status indication circuit can output the status signal latched in the status latching circuit. By reading this status signal and combining it with the controller's log data, maintenance personnel can accurately determine the fault status. For example, if the status signal indicates that the switch drive circuit has received the controller's control signal, but the disconnect switch has not tripped, it may be due to a mechanical fault in the disconnect switch itself. If the status signal indicates that the switch drive circuit has not received the controller's control signal, but the disconnect switch has tripped, it may be due to interference in the switch drive circuit or an unexpected fault in the disconnect switch itself.

[0045] In this embodiment, by setting a status indicator circuit, the status signal latched in the status latch circuit can be conveniently provided to maintenance personnel, which brings convenience to maintenance personnel.

[0046] In some embodiments, the status signal includes: a first status signal indicating that the disconnecting switch has received a tripping drive signal, or a second status signal indicating that the disconnecting switch has not received a tripping drive signal; indicating that the disconnecting switch has malfunctioned when the controller issues a control signal to control the disconnecting switch to be disconnected, the disconnecting switch does not trip, and the status signal is the first status signal; or indicating that there is a fault between the disconnecting switch and the controller when the controller issues a control signal to control the disconnecting switch to be disconnected, the disconnecting switch does not trip, and the status signal is the second status signal; or indicating that there is a fault between the disconnecting switch and the controller when the controller does not record a control signal, the disconnecting switch trips, and the status signal is the first status signal; or indicating that the disconnecting switch has malfunctioned when the controller does not record a control signal, the disconnecting switch trips, and the status signal is the second status signal.

[0047] In this embodiment, the status signal is used to indicate whether the disconnect switch has received a trip drive signal, in order to help indicate the cause of the fault. Normally, the disconnect switch only receives a trip drive signal when the controller issues a control signal.

[0048] The first status signal indicates that the tripping switch has received a tripping drive signal, while the second status signal indicates that the tripping switch has not received a tripping drive signal. By indicating different status signals and combining this with the actual tripping status of the tripping switch, the fault condition of the power converter can be accurately determined.

[0049] In actual operation, when the controller sends a control signal to instruct the disconnect switch to trip, but the disconnect switch fails to trip, and the status signal is the first status signal, it indicates that the disconnect switch itself may have a mechanical failure. At this time, the disconnect switch has correctly received the trip drive signal, but it has not performed the tripping action, which may be due to mechanical structural failure or internal damage to the disconnect switch itself.

[0050] If the controller sends a control signal, but the disconnect switch does not trip, and the status signal is the second status signal, it indicates a possible fault between the controller and the disconnect switch. In this case, the disconnect switch not receiving the trip drive signal may be due to poor contact, open circuit, faulty switch drive circuit, or other faults in the control signal transmission line.

[0051] When the controller fails to record the control signal (i.e., the controller's log data does not record the control event corresponding to the control signal), but the disconnect switch trips, and the status signal is the first status signal, it indicates a fault has occurred between the disconnect switch and the controller. In this case, it is possible that strong voltage interference has occurred in the power converter circuit, causing the switch drive circuit to incorrectly output a trip drive signal to the disconnect switch, resulting in the disconnect switch tripping and causing the status latch circuit to incorrectly latch the status signal.

[0052] If the controller does not record the control event of the control signal, and the disconnect switch trips, and the status signal is the second status signal, it indicates that there may be a fault in the disconnect switch itself. In this case, no tripping drive signal is issued, but the disconnect switch trips unexpectedly, which may be due to aging of the mechanical components of the disconnect switch or malfunction caused by environmental factors (such as temperature or vibration).

[0053] In this embodiment, the controller's log data can record information related to control events in which the controller issued control signals. Thus, it is possible to determine whether the controller issued a control signal through the log data.

[0054] In this embodiment, by combining the status signals and the actual action results of the disconnect switch under the above-mentioned various conditions, maintenance personnel can quickly analyze the cause of the fault, determine whether the problem lies in the disconnect switch body, the control signal line, or interference from the controller or drive circuit, and thus take targeted maintenance measures.

[0055] In some embodiments, the state latching circuit has a power supply independent of the controller.

[0056] In this embodiment, the state latch circuit has a power supply independent of the controller. By providing an independent power supply to the state latch circuit, it can continue to operate normally and reliably latch the state signal representing the state of the switch drive circuit even if the controller loses power or experiences a rapid power-down. Specifically, when the power converter fails and the controller fails to record log data due to power interruption, the independently powered state latch circuit can continue to operate, ensuring that the state signal at the time of the fault is accurately latched. This effectively helps maintenance personnel quickly determine the cause of the fault. For example, the state latch circuit can have an independent power supply, such as battery power.

[0057] This application also provides a fault indication method for a power converter, including: latching state information through a state latching circuit; wherein the state signal is used to indicate whether the disconnecting switch of the power converter has received a tripping drive signal.

[0058] The specific functions and effects of the steps in the fault indication method for the power converter can be explained by referring to the foregoing embodiments, and will not be repeated here.

[0059] It is understood that the term "connection" in the embodiments of this application can be interpreted as "electrical connection," "communication connection," etc., if the connected circuits, modules, units, etc. can transmit electrical signals or data to each other.

[0060] It is understood that the specific examples in this document are only intended to help those skilled in the art better understand the embodiments of this application, and are not intended to limit the scope of the invention.

[0061] It is understood that in the various embodiments of this application, the sequence number of each process does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0062] It is understood that the various embodiments described in this application can be implemented individually or in combination, and the embodiments of this application are not limited in this respect.

[0063] It is understood that the processor in the embodiments of this application can be an integrated circuit chip with signal processing capabilities. In implementation, each step of the above method embodiments can be completed by integrated logic circuits in the processor's hardware or by instructions in software form. The processor can be a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components. It can implement or execute the methods, steps, and logic block diagrams disclosed in the embodiments of this application. The general-purpose processor can be a microprocessor or any conventional processor. The steps of the methods disclosed in the embodiments of this application can be directly embodied as execution by a hardware decoding processor, or as a combination of hardware and software modules in the decoding processor. The software modules can reside in random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, registers, or other mature storage media in the art. The storage medium is located in memory, and the processor reads information from the memory and, in conjunction with its hardware, completes the steps of the above method.

[0064] It is understood that the memory in the embodiments of this application may be volatile memory or non-volatile memory, or may include both volatile and non-volatile memory. Specifically, non-volatile memory may be read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), or flash memory. Volatile memory may be random access memory (RAM). It should be noted that the memory in the systems and methods described herein is intended to include, but is not limited to, these and any other suitable types of memory.

[0065] Unless otherwise stated, all technical and scientific terms used in the embodiments of this application have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to limit the scope of this application. The term "and / or" as used in this application includes any and all combinations of one or more of the associated listed items. The singular forms "a," "the," and "the" as used in the embodiments of this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0066] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0067] Those skilled in the art will understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0068] In the embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between apparatuses or units may be electrical, mechanical, or other forms.

[0069] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0070] The above description is merely a specific embodiment of this application, but the scope of protection of this invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this invention should be determined by the scope of the claims.

Claims

1. A power converter, characterized in that, include: Power conversion circuit; Disconnect switch, connected to the power conversion circuit; Controller, used to control the disconnect switch; A status latching circuit is used to latch a status signal; wherein the status signal is used to indicate whether the disconnecting switch has received a tripping drive signal.

2. The power converter according to claim 1, characterized in that, The power converter includes a switch driving circuit for driving the disconnect switch; a voltage threshold circuit is provided between the state latch circuit and the switch driving circuit, the voltage threshold circuit can obtain the trip drive signal issued by the switch driving circuit; the voltage threshold circuit allows an electrical signal whose signal voltage meets the voltage threshold condition to be input to the state latch circuit; wherein, the trip drive signal output by the switch driving circuit meets the voltage threshold condition.

3. The power converter according to claim 1, characterized in that, The power converter includes a switch driving circuit for driving the disconnect switch; a delay filter circuit is provided between the state latch circuit and the switch driving circuit, and the delay filter circuit can obtain the disconnect drive signal output by the switch driving circuit. The delay filtering circuit allows electrical signals whose duration exceeds a threshold duration to be input to the state latching circuit; wherein, the duration of the jump drive signal output by the switch drive circuit exceeds the threshold duration.

4. The power converter according to claim 1, characterized in that, The power converter is also provided with a status indication circuit, which is used to output the status signal latched in the status latching circuit.

5. The power converter according to any one of claims 1 to 4, characterized in that, The status signals include: a first status signal indicating that the disconnecting switch has received a tripping drive signal, or a second status signal indicating that the disconnecting switch has not received a tripping drive signal; If the controller issues a control signal to disconnect the disconnect switch, and the disconnect switch fails to trip, and the status signal is the first status signal, it indicates that the disconnect switch has malfunctioned; or, If the controller issues a control signal to disconnect the disconnect switch, and the disconnect switch fails to trip, and the status signal is the second status signal, it indicates a fault exists between the disconnect switch and the controller; or... If the controller fails to record a control signal, the disconnect switch trips, and the status signal is the first status signal, it indicates a fault has occurred between the disconnect switch and the controller; or... If the controller does not record a control signal, the disconnect switch trips, and the status signal is the second status signal, it indicates that the disconnect switch has malfunctioned.

6. The power converter according to claim 5, characterized in that, The state latch circuit has a power supply independent of the controller.

7. A fault indication method for a power converter, characterized in that, include: A status signal is latched by a status latching circuit; wherein the status signal is used to indicate whether the disconnecting switch of the power converter has received a tripping drive signal.

8. The method according to claim 7, characterized in that, Also includes: The electrical signal output by the switch drive circuit is obtained through a voltage threshold circuit; When the voltage of the electrical signal meets the voltage threshold condition of the voltage threshold circuit, the electrical signal is allowed to be input to the state latch circuit; wherein, the voltage of the jump-off drive signal output by the switch drive circuit meets the voltage threshold condition.

9. The method according to claim 7, characterized in that, Also includes: The electrical signal output by the switch drive circuit is obtained through a delay filtering circuit; If the duration of the electrical signal exceeds the threshold duration of the delay filter circuit, the electrical signal is allowed to be input to the state latch circuit; wherein, the duration of the jump-off drive signal output by the switch drive circuit exceeds the threshold duration.

10. The method according to claim 7, characterized in that, Also includes: The state signal latched in the state latching circuit is output through the state indication circuit.

11. The fault indication method according to any one of claims 7 to 10, characterized in that, The status signals include: a first status signal indicating that the disconnecting switch has received a tripping drive signal, or a second status signal indicating that the disconnecting switch has not received a tripping drive signal; If the controller issues a control signal to disconnect the disconnect switch, and the disconnect switch fails to trip, and the status signal is the first status signal, it indicates that the disconnect switch has malfunctioned; or... If the controller issues a control signal to disconnect the disconnect switch, and the disconnect switch fails to trip, and the status signal is the second status signal, it indicates a fault exists between the disconnect switch and the controller; or... If the controller fails to record a control signal, the disconnect switch trips, and the status signal is the first status signal, it indicates a fault exists between the disconnect switch and the controller; or... If the controller does not record a control signal, the disconnect switch trips, and the status signal is the second status signal, it indicates that the disconnect switch has malfunctioned.

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