Method for protecting a power conversion circuit, power conversion device, and storage medium

Abstract

The method for protecting a power conversion circuit of the present application includes calculating an attenuation amount of the conversion efficiency of the power conversion circuit within a predetermined time when the power conversion circuit is in a steady state, monitoring the attenuation amount based on a predetermined attenuation threshold, obtaining a duration during which the attenuation amount exceeds the predetermined attenuation threshold, and performing a predetermined protection operation when the duration exceeds a predetermined protection time.

Description

[Technical Field]

[0001] The present application relates to the technical field of circuit protection, and more particularly to a method for protecting a power conversion circuit, a power conversion device, and a storage medium. [Background technology]

[0002] The discussion herein is merely intended to provide background information related to the present application and does not necessarily constitute exemplary technical aspects.

[0003] A power conversion circuit typically refers to a circuit that converts AC to AC, AC to DC, or DC to DC. The energy conversion efficiency of a power conversion circuit typically does not reach 100%, and the lost energy is converted into heat in the power device. If poor heat dissipation or element degradation occurs, heat will accumulate. If the temperature of a power device in a power conversion circuit exceeds the maximum operating temperature, the power device will be damaged, causing the power conversion circuit to stop functioning.

[0004] In the related art, a temperature sensor or a temperature sampling circuit is usually used to sample the temperature of an element, and a protective operation is performed when the temperature exceeds a safe operating temperature. However, since a large power conversion circuit usually has multiple power devices, sampling the temperatures of the power devices using a temperature sensor or a temperature sampling circuit increases the manufacturing cost and complexity of the circuit and reduces the stability of the circuit. Summary of the Invention

[0005] Each embodiment of the present application provides a method for protecting a power conversion circuit, a power conversion device, and a storage medium.

[0006] In a first aspect, the present application provides a method for protecting a power conversion circuit, the method for protecting a power conversion circuit comprising: calculating an attenuation amount of the conversion efficiency of the power conversion circuit within a predetermined time period when the power conversion circuit is in a steady state; monitoring the attenuation based on a preset attenuation threshold and obtaining a duration during which the attenuation exceeds the preset attenuation threshold; and performing a preset protection action if the duration exceeds a preset protection time.

[0007] In a second aspect, the present application further provides a power conversion apparatus comprising a power conversion circuit and a controller arranged to implement the steps of the method for protecting a power conversion circuit described above.

[0008] In a third aspect, the present application further provides a computer-readable storage medium having stored thereon a computer program that, when executed by a processor, causes the processor to implement the steps of the above-described method for protecting a power conversion circuit.

[0009] The details of one or more embodiments of the application are set forth in the accompanying drawings and the description below. Other features, objects, and advantages of the application will become apparent from the description, the accompanying drawings, and the claims. [Brief explanation of the drawings]

[0010] In order to more clearly describe the technical aspects of the embodiments of the present application, the accompanying drawings used in the description of the embodiments are briefly introduced below. The accompanying drawings in the following description are part of the embodiments of the present application, and it is obvious that those skilled in the art can obtain other accompanying drawings from these accompanying drawings without any creative efforts. [Figure 1] 1 is a flowchart of a method for protecting a power conversion circuit provided by an embodiment of the present application; [Figure 2] 2 is a flowchart of a method for determining a steady state of a power conversion circuit according to an embodiment of the present application; [Figure 3] 1 is a flowchart of another power conversion circuit protection method provided by an embodiment of the present application; [Figure 4] 1 is a schematic block diagram of a power conversion device provided by an embodiment of the present application; [Figure 5]1 is a schematic block diagram of the configuration of an electronic device provided by an embodiment of the present application.The realization of the object, functional features and advantages of the present application will be further described in conjunction with the embodiment with reference to the accompanying drawings. DETAILED DESCRIPTION OF THE INVENTION

[0011] The technical aspects of the embodiments of the present application will be described below clearly and completely with reference to the accompanying drawings of the embodiments of the present application, but it is clear that the described embodiments are only some of the embodiments of the present application and do not represent all of the embodiments. Based on the embodiments of the present application, other embodiments that can be obtained by a person skilled in the art without paying any creative effort also fall within the scope of protection of the present application.

[0012] The flowcharts shown in the accompanying drawings are merely illustrative and do not necessarily include all the contents and operations / steps, and do not necessarily have to be performed in the order described. For example, some operations / steps may be separated, combined, or partially integrated, and the actual execution order may be changed according to actual circumstances.

[0013] Some embodiments of the present application will be described in detail below with reference to the accompanying drawings. Unless inconsistent, the following examples and features of the examples can be combined.

[0014] The present invention provides a power conversion circuit protection method, a power conversion device, and a computer-readable storage medium. The method provides a method for indirectly monitoring temperature changes in a power conversion circuit by monitoring the amount of power decay in a steady state. When the method detects that the amount of power decay exceeds a predetermined decay threshold and that the duration exceeds a predetermined protection time, it determines that the power conversion circuit is in a persistently high temperature state. To prevent damage to the power conversion circuit, a predetermined protection operation is triggered, immediately stopping circuit operation and dissipating heat. The above method achieves temperature protection for the power conversion circuit while avoiding the impact on circuit stability and the increased circuit complexity of adding components, thereby reducing costs.

[0015] Please refer to FIG. 1, which is a flowchart of a method for protecting a power conversion circuit provided by an embodiment of the present application.

[0016] As shown in FIG. 1, the method for protecting a power conversion circuit includes steps S110 to S130.

[0017] In step S110, when the power conversion circuit is in a steady state, the amount of attenuation of the conversion efficiency of the power conversion circuit within a preset time is calculated.

[0018] It should be understood that the power conversion circuit includes an AC / DC circuit, a DC / DC circuit, or a combination thereof. The AC / DC circuit may be an AC-to-DC rectifier circuit or a DC-to-AC inverter circuit. The DC / DC circuit includes an LLC circuit, a buck converter circuit, a boost converter circuit, a buck-boost converter circuit, or a combination thereof.

[0019] A power conversion circuit being in a steady state can be understood to mean being in a stable operating state, such as a boost, buck, rectifier, or inverter. The conversion efficiency of a power conversion circuit may vary under different operating conditions, but when the power conversion circuit operates stably under the same operating condition, the conversion efficiency is usually maintained stably.

[0020] In one embodiment, the amount of attenuation of the conversion efficiency within a predetermined time can be obtained by calculating the difference between the current conversion efficiency of the power conversion circuit and the conversion efficiency from a predetermined time ago.

[0021] In this embodiment, when the power conversion circuit is in a steady state, the attenuation of the conversion efficiency of the power conversion circuit shows an approximately linear relationship with the operating time, so by monitoring the attenuation of the conversion efficiency of the power conversion circuit in the steady state, it is possible to indirectly monitor whether the power conversion circuit is operating normally.

[0022] In one embodiment, during operation of a power conversion circuit, factors that affect conversion efficiency generally include heat accumulation, current changes, voltage changes, etc. Generally, current changes and voltage changes cause sudden changes in conversion efficiency, and heat accumulation causes a sustained decrease in conversion efficiency.

[0023] In one embodiment, the temperature, real-time conversion efficiency, and attenuation of the power conversion circuit can be detected in advance, and the power conversion circuit can be tested to obtain the pattern of parameter changes in different states. For example, in a non-steady state, the relationship between real-time conversion efficiency and time and the change trend between attenuation and temperature can be obtained, and in a steady state, the effect of temperature change on real-time conversion efficiency and attenuation can be obtained. By establishing the correspondence between temperature and attenuation and monitoring the attenuation of the real-time conversion efficiency, temperature monitoring of the power conversion circuit can be realized, and further, protection of the power conversion circuit can be realized.

[0024] In one embodiment, the efficiency of a power conversion circuit varies very little in a stable operating state (i.e., a steady state), and when a temperature abnormality occurs due to heat accumulation, the efficiency decreases as the temperature rises. Therefore, by monitoring the conversion efficiency of the power conversion circuit when the power conversion circuit is in a steady state, it is possible to monitor and protect the circuit state.

[0025] In step S120, the attenuation amount is monitored based on a preset attenuation threshold, and a duration during which the attenuation amount exceeds the preset attenuation threshold is obtained.

[0026] In this embodiment, a preset attenuation threshold for the power conversion circuit in a steady state is set, the efficiency attenuation amount of the power conversion circuit in the steady state within a preset time is sampled, and the attenuation amount is compared with the attenuation threshold, thereby determining the current state of the power conversion circuit.

[0027] It should be understood that with the passage of time, the temperature of the power conversion circuit will continuously accumulate and rise, which will affect the conversion efficiency of the power conversion circuit. When the temperature of the power conversion circuit accumulates to a certain temperature value, it will cause instability of the power conversion circuit, i.e., the steady state of the power conversion circuit will be destroyed.

[0028] If the amount of power attenuation exceeds a preset attenuation threshold, it can be determined that the temperature of the power conversion circuit may have accumulated to a certain level, and in this case, the operation of the power conversion circuit must be immediately stopped to avoid destruction of the circuit due to high temperature.

[0029] Possible factors that change the conversion efficiency of a power conversion circuit include temperature accumulation and changes, as well as sudden changes in voltage, current, etc., or other influencing factors. In order to avoid the operation of the power conversion circuit being stopped due to an erroneous determination, which would affect the operating efficiency and reliability of the circuit, the duration for which the attenuation exceeds a preset attenuation threshold is monitored, making it possible to determine whether the circuit efficiency attenuation is due to temperature factors, and preventing erroneous determinations caused by sudden changes in voltage, current, etc.

[0030] In step S130, if the duration exceeds a preset protection time, a preset protection action is performed.

[0031] In this embodiment, when it is detected that the amount of power attenuation exceeds a preset attenuation threshold, timing is started and the time during which the amount of power attenuation remains above the preset attenuation threshold is recorded.

[0032] If the duration exceeds the preset protection time, it can be determined that the factor causing the reduction in the conversion efficiency of the power conversion circuit is temperature, i.e., the temperature of the power conversion circuit may have reached a critical point for circuit protection, and in this case, a preset protection operation is triggered to stop the operation of the power conversion circuit to prevent damage to the power conversion circuit due to excessively high temperature.

[0033] In one embodiment, if the time at which the power conversion circuit enters a steady state is less than a target time threshold, the preset protection time is the time at which the power conversion circuit enters a steady state. If the time at which the power conversion circuit enters a steady state is greater than or equal to the target time threshold, the preset protection time is the target time threshold.

[0034] In one embodiment, different preset protection times can be set for different circuit configurations and power devices, for example, the target time threshold can be set based on the average time that the same type of power conversion circuit maintains steady state.

[0035] In one embodiment, each time the power conversion circuit enters the steady state, the duration for which the power conversion circuit maintains the steady state, i.e., a preset time, is accumulated and recorded, and the average time can be updated based on the preset time. If the newly recorded average time changes significantly, for example, if the average time changes by 20% or more, the target time threshold is adaptively adjusted.

[0036] This embodiment provides a method for protecting a power conversion circuit. When the power conversion circuit is in a steady state, the method calculates the attenuation of the power conversion efficiency over a predetermined time period, continuously monitors the attenuation based on a predetermined attenuation threshold, and determines the duration for which the attenuation exceeds the predetermined attenuation threshold. If the duration exceeds the predetermined protection time, a predetermined protection action is executed. When the power conversion circuit is in a steady state, heat accumulation in the power conversion circuit accelerates the efficiency degradation of the power conversion circuit. Therefore, by monitoring the power attenuation in the steady state, the temperature change of the power conversion circuit can be indirectly monitored. When it is detected that the power attenuation exceeds the predetermined attenuation threshold and the duration exceeds the predetermined protection time, it is determined that the power conversion circuit is in a persistently high temperature state. To avoid damage to the power conversion circuit, a predetermined protection action is triggered, immediately stopping circuit operation and dissipating heat. This method provides temperature protection for the power conversion circuit while avoiding the impact on circuit stability and the complexity of the circuit due to additional components, thereby reducing costs.

[0037] Please refer to FIG. 2, which is a flowchart of a method for determining the steady state of a power conversion circuit provided by an embodiment of the present application.

[0038] As shown in FIG. 2, the method for determining a steady state of a power conversion circuit includes steps S101 to S104.

[0039] In S101, the current conversion efficiency of the power conversion circuit is calculated based on the input power and output power of the power conversion circuit.

[0040] In this embodiment, the conversion efficiency refers to the efficiency of the power conversion circuit when performing power conversion, and is determined by the input power and the output power. Therefore, by calculating the conversion efficiency, the input power and the output power of the power conversion circuit can be continuously sampled, and the ratio of the output power to the input power at each time point can be calculated to obtain the conversion efficiency at each time point, i.e., the real-time conversion efficiency.

[0041] In S102, a real-time efficiency deviation is calculated based on the past conversion efficiency and the current conversion efficiency, where the past conversion efficiency is the conversion efficiency detected last time.

[0042] In S103, the real-time efficiency deviation is monitored based on a preset deviation threshold, and a first time period during which the real-time efficiency deviation is less than the preset deviation threshold is obtained.

[0043] In S104, if the first time period reaches a preset steady state time period, it is determined that the power conversion circuit is in a steady state.

[0044] By calculating the conversion efficiency at different times and comparing each calculated conversion efficiency with the previously calculated conversion efficiency, i.e., by comparing with past conversion efficiencies, the fluctuation range of the conversion efficiency is monitored and it is determined whether the power conversion circuit has entered a steady state.

[0045] In one embodiment, when a real-time efficiency deviation between the current conversion efficiency and the past conversion efficiency is less than a preset deviation threshold, timing is started and a duration during which the real-time efficiency deviation is less than the preset deviation threshold, i.e., a first time, is recorded. When the first time reaches a preset steady-state time, it can be determined that the power conversion circuit has entered a steady state.

[0046] It should be understood that the object of monitoring is the time during which the real-time efficiency deviation is continuously below the preset deviation threshold, and that the fact that the real-time efficiency deviation is continuously below the preset deviation threshold indicates that the current fluctuation of the circuit is extremely small, while the fact that the real-time efficiency deviation cannot be maintained continuously below the preset deviation threshold indicates that the circuit is still fluctuating and has not yet entered a steady state. This prevents a power conversion circuit that has not yet entered a steady state from being erroneously determined to have entered the steady state, which can lead to inaccurate attenuation monitoring and erroneous protection.

[0047] In one embodiment, step S103 specifically includes: monitoring the real-time efficiency deviation; When detecting that the real-time efficiency deviation is less than the preset deviation threshold, accumulating the first time period; resetting the first time period when detecting that the real-time efficiency deviation is equal to or greater than the preset deviation threshold.

[0048] In this embodiment, the real-time efficiency deviation of the power conversion circuit may fluctuate back and forth just before the power conversion circuit enters the steady state. To ensure that the power conversion circuit is maintained in the steady state, when monitoring the real-time efficiency deviation, it is necessary to integrate the duration during which the real-time efficiency deviation is less than a preset deviation threshold.

[0049] In one embodiment, if the real-time efficiency deviation is continuously less than a preset deviation threshold, the duration, i.e., the first time, is accumulated until the first time reaches a preset steady state time, and it is determined that the power conversion circuit has entered a steady state.

[0050] In one embodiment, if the first time period does not reach a preset steady state time period, it is determined that the power conversion circuit is in an unsteady state.

[0051] In one embodiment, if the real-time efficiency deviation exceeds a preset deviation threshold while the predetermined steady-state time has not yet been reached after the first time accumulation has started, the circuit state is recognized as unstable at this point, and the first time accumulation is cleared to avoid false determination of the steady-state state. If the real-time efficiency deviation is then detected to be less than the preset deviation threshold, the first time accumulation is resumed.

[0052] Please refer to FIG. 3, which is a flowchart of another method for protecting a power conversion circuit provided by an embodiment of the present application.

[0053] As shown in FIG. 3, based on the embodiment shown in FIG. 1 above, in this embodiment, the step S110 specifically includes the following steps: In step S111, when the power conversion circuit enters the steady state as described above, the conversion efficiency of the power conversion circuit is collected at a preset collection interval.

[0054] In this embodiment, after the power conversion circuit enters a steady state, the real-time conversion efficiency of the power conversion circuit is stably collected at a preset collection interval. In step S112, the conversion efficiencies are stored in a queue of a preset capacity in the order of collection.

[0055] In one embodiment, when the power conversion circuit enters a steady state, a queue with a capacity n is newly created, and the currently collected real-time conversion efficiencies are sequentially stored in the queue according to a preset collection interval and collection order until the queue is full. It should be understood that the preset capacity can be set based on a preset time and a preset collection interval.

[0056] In step S113, the difference between the head data and the tail data in the queue is calculated to obtain the amount of attenuation.

[0057] In one embodiment, if the queue is not full, the real-time conversion efficiency first collected when the power conversion circuit enters a steady state is used as the decay reference value for the real-time conversion efficiencies collected thereafter, and the difference between the currently collected real-time conversion efficiency and the decay reference value is used as the decay value corresponding to the currently collected real-time conversion efficiency.

[0058] It should be understood that the preset time is the time between the collection time of head data and the collection time of tail data. Before the queue is full, the preset time is the total collection interval between the current tail data and head data and is a variable value. After the queue is full, the preset time is a fixed value, i.e., the product of the queue length and the preset collection interval.

[0059] For example, the preset collection interval is 1 second, i.e., the real-time conversion efficiency of the power conversion circuit is collected every 1 second, and the queue capacity is preset to 6, i.e., six real-time conversion efficiency values ​​can be stored simultaneously by the queue. When the queue capacity is full, i.e., when six real-time conversion efficiency values ​​are already present in the queue, the real-time conversion efficiency is collected again, and the head data at this time is extracted as the reference value of the real-time conversion efficiency, and the real-time conversion efficiency is added to the tail of the queue as tail data. In this case, the time interval between the head data and the tail data is 6 seconds, i.e., the preset time is 6 seconds.

[0060] In one embodiment, if the queue is full, a dequeue operation is performed on the head data of the queue and the currently collected conversion efficiency is stored in the queue as tail data, and if the queue is not full, the currently collected conversion efficiency is stored in the queue as tail data.

[0061] In one embodiment, the capacity of the queue is constant. When the queue becomes full, when the real-time conversion efficiency is collected again, the head data in the queue is extracted as the decay reference value of the currently collected real-time conversion efficiency, and the currently collected real-time conversion efficiency is stored in the tail of the queue, so as to maintain the full state of the queue. In this case, the decay reference values ​​corresponding to the real-time conversion efficiencies collected thereafter will all be the head data of the current queue, that is, the time intervals will be consistent, thereby ensuring the stability and reliability of the decay value calculation.

[0062] In addition to the queue method, the attenuation within a predetermined time period may be calculated by other methods, and it should be understood that the present application does not limit the method of realization. For example, the attenuation within a predetermined time period may be calculated by directly recording the collection time points. For example, in a steady state, if a conversion efficiency e1 is collected at time point t1 and a conversion efficiency e2 is collected at time point t1+T, where T is a predetermined time, the attenuation within the predetermined time period Δe=e2−e1 can be directly calculated.

[0063] Hereinafter, a method for calculating the amount of attenuation of the conversion efficiency of a power conversion circuit within a preset time will be described, taking a queue-based method as an example.

[0064] 1. Assume that from time t1, the power conversion circuit enters a steady state. 2. The capacity of the queue for storing data is n, and recording of the real-time conversion efficiency e1 of the power conversion circuit is started from time t1, and n The queue becomes full at time t n+1 So, t n+1 Real-time conversion efficiency e n+1 Then, e1 is enqueued and e2 is dequeued. At this time, the head of the queue becomes e2, and so on. 3. Let the current time be t x and t n+1 The queue is not full before t x −t1, and at this time, the reference value of the conversion efficiency e=e1. 4.t n+1 Since then, the queue is full, and the preset time corresponding to the calculated attenuation is Δt*n, where Δt is the sampling interval, i.e., (t n+1 -t n ) where the reference value of the conversion efficiency is the head data, that is, e = e x-n+1 is. 5. Attenuation within a preset time = conversion efficiency reference value - current conversion efficiency, i.e., △e = ee x .

[0065] It should be understood that when storing the conversion efficiency using the queue method, each time the attenuation amount is calculated, the head data and tail data can be extracted and the difference between them can be calculated as the attenuation amount, eliminating the need for timing and simplifying the calculation method.

[0066] 4, which is a schematic block diagram of a power conversion device provided by an embodiment of the present application. The power conversion device 200 includes one or more power conversion circuits 201 and one or more controllers 202, and the one or more controllers 202 operate individually or in cooperation to implement steps of the method for protecting the power conversion circuit.

[0067] For example, the power conversion circuit 201 and the controller 202 can be connected via a bus 203 .

[0068] For example, the controller 202 may be a microcontroller unit (MCU), a central processing unit (CPU), or a digital signal processor (DSP).

[0069] For example, the controller 202 includes a memory 204 capable of storing a computer-readable storage medium, such as a flash memory chip, a read-only memory (ROM), a magnetic disk, an optical disk, a USB flash drive, or an external hard disk.

[0070] Here, the controller 202 is arranged to execute a computer program stored in the memory 204 and to implement the steps of the method for protecting the power conversion circuit during the execution of the computer program.

[0071] For example, the controller 202 executes a computer program stored in the memory 204, and during execution of the computer program: calculating an attenuation amount of the conversion efficiency of the power conversion circuit within a predetermined time period when the power conversion circuit is in a steady state; monitoring the attenuation based on a preset attenuation threshold and obtaining a duration during which the attenuation exceeds the preset attenuation threshold; and performing a preset protection action if the duration exceeds a preset protection time.

[0072] It should be apparent to those skilled in the art that, for convenience and brevity of explanation, the specific operating processes of the above-mentioned devices and each module can refer to the corresponding processes in the above-mentioned embodiment of the method for protecting a power conversion circuit, and will not be described again here.

[0073] It should be understood that the above power conversion apparatus may be an independent power conversion device such as an inverter, a buck-boost converter, etc., or may be built into other devices to achieve the power conversion function.

[0074] Referring to Figure 5, Figure 5 is a schematic block diagram of the configuration of an electronic device provided by an embodiment of the present application, which may be a terminal using a power conversion circuit.

[0075] For example, the electronic device may be an energy storage device with power conversion functionality, a power converter, a power management device, a smart power control panel, etc.

[0076] For example, the electronic device may be a self-propelled device with a built-in power conversion circuit, and the self-propelled device may be a device including a self-propelled assist function. Here, the self-propelled assist function may be realized by an in-vehicle terminal, and the corresponding self-propelled device may be a vehicle equipped with the in-vehicle terminal. The self-propelled device may be a semi-self-propelled device or a fully autonomous driving device. For example, the self-propelled device may be a lawn mower, a vacuum cleaner, a robot with a navigation function, etc.

[0077] Referring to FIG. 5, the electronic device includes a processor 301, a memory 302, and a network interface 303 connected via a system bus, where the memory 302 includes a non-volatile storage medium.

[0078] The non-volatile storage medium can store an operating system and a computer program, which includes program instructions that, when executed, can cause the processor 301 to perform a method for protecting any power conversion circuit.

[0079] The processor 301 is used to provide computing and control functions to support the overall operation of the electronic device.

[0080] The internal memory provides an environment for executing a computer program stored in a non-volatile storage medium, and when the computer program is executed by the processor 301, the processor 301 can execute a method for protecting any power conversion circuit.

[0081] The network interface 303 is used for network communication, for example, for transmitting assigned tasks, etc. It should be understood by those skilled in the art that the configuration shown in Fig. 5 is merely a block diagram of the configuration of parts related to the embodiments of the present application, and does not limit the electronic device to which the embodiments of the present application are applied, and that a specific electronic device may include more or fewer components than those shown, may combine specific components, or may have a different component arrangement.

[0082] It should be understood that the processor 301 may be a Central Processing Unit (CPU) or other general-purpose processor such as a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field-Programmable Gate Array (FPGA) or other programmable logic element, discrete logic gates or transistor-transistor logic, discrete hardware components, etc., where the general-purpose processor is a microprocessor or any conventional processor.

[0083] In one embodiment, the processor 301 is used to execute a computer program stored in a memory, calculating an attenuation amount of the conversion efficiency of the power conversion circuit within a predetermined time period when the power conversion circuit is in a steady state; monitoring the attenuation based on a preset attenuation threshold and calculating a duration during which the attenuation exceeds the preset attenuation threshold; and if the duration exceeds a preset protection time, performing a preset protection action.

[0084] In one embodiment, when the power conversion circuit is in the steady state as described above, before performing the step of calculating the attenuation amount of the conversion efficiency of the power conversion circuit within a preset time, the processor 301 calculating a current conversion efficiency of the power conversion circuit based on an input power and an output power of the power conversion circuit; calculating a real-time efficiency deviation based on a past conversion efficiency, which is a conversion efficiency detected last time, and the current conversion efficiency; monitoring the real-time efficiency deviation based on a preset deviation threshold, and obtaining a first time when the real-time efficiency deviation is less than the preset deviation threshold; The method further includes determining that the power conversion circuit is in a steady state when the first time period reaches a preset steady state time period.

[0085] In one embodiment, when the processor 301 performs the step of monitoring the real-time efficiency deviation based on the preset deviation threshold as described above, and obtaining a first time when the real-time efficiency deviation is less than the preset deviation threshold, monitoring the real-time efficiency deviation; When detecting that the real-time efficiency deviation is less than the preset deviation threshold, accumulating the first time period; resetting the first time when it is detected that the real-time efficiency deviation is equal to or greater than the preset deviation threshold.

[0086] In one embodiment, after achieving the above-described obtaining a first time period during which the real-time efficiency deviation is less than the preset deviation threshold, the processor 301: The method further comprises determining that the power conversion circuit is in an unsteady state if the first time does not reach a preset steady state time.

[0087] In one embodiment, when the processor 301 realizes calculating the attenuation of the conversion efficiency of the power conversion circuit within a preset time when the power conversion circuit is in a steady state as described above, The attenuation amount is obtained by calculating a difference between the current conversion efficiency of the power conversion circuit and the conversion efficiency from the preset time ago.

[0088] In one embodiment, the processor 301 is used to execute a computer program stored in memory, and if the time that the power conversion circuit enters a steady state is less than a target time threshold, the preset time is the time that the power conversion circuit enters a steady state; The method further implements that if the time during which the power conversion circuit enters a steady state is equal to or greater than the target time threshold, the preset time is the target time threshold.

[0089] In one embodiment, when the processor 301 calculates the attenuation of the power conversion efficiency of the power conversion circuit within a predetermined time period when the power conversion circuit is in a steady state as described above, When the power conversion circuit enters a steady state as described above, collecting the conversion efficiency of the power conversion circuit at a predetermined collection interval; storing the conversion efficiencies in a queue of a preset capacity in the order of collection; The difference between the head data and the tail data in the queue is calculated to obtain the attenuation amount, and the preset time is the time between the collection time of the head data and the collection time of the tail data.

[0090] In one embodiment, when the processor 301 stores the conversion efficiencies in a queue having a predetermined capacity in the collected order as described above, When the queue is full, performing a dequeue operation on the head data of the queue and storing the currently collected conversion efficiency as tail data in the queue; If the queue is not full, the currently collected conversion efficiency is stored in the queue as tail data.

[0091] An embodiment of the present application further provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program including program instructions, and when the program instructions are executed by the processor, any of the power conversion circuit protection methods provided by the embodiments of the present application is realized.

[0092] Here, the computer-readable storage medium is the internal storage device of the computer device described in the above embodiments, such as a hard disk or memory installed in the computer device, and the computer-readable storage medium is the external storage device of the computer device, such as an external hard disk, a SmartMedia Card (SMC), a Secure Digital Card (SD), a Flash Card, etc.

[0093] The above is merely a specific embodiment of the present application, and the scope of protection of the present application is not limited thereto. Those skilled in the art can easily conceive of various equivalent modifications or replacements that fall within the scope of the technical forms disclosed in the present application. Therefore, the scope of protection of the present application is defined by the claims.

Claims

1. A method for protecting a power conversion circuit, comprising: Calculating an attenuation amount of the conversion efficiency of the power conversion circuit within a preset time when the power conversion circuit is in a steady state; monitoring the attenuation based on a preset attenuation threshold and obtaining a duration during which the attenuation exceeds the preset attenuation threshold; and performing a preset protection action if the duration exceeds a preset protection time.

2. When the power conversion circuit is in a steady state as described above, before calculating the attenuation amount of the conversion efficiency of the power conversion circuit within a preset time, Calculating a current conversion efficiency of the power conversion circuit based on an input power and an output power of the power conversion circuit; Calculating a real-time efficiency deviation based on a past conversion efficiency and the current conversion efficiency, the past conversion efficiency being the conversion efficiency detected last time; monitoring the real-time efficiency deviation based on a preset deviation threshold, and obtaining a first time when the real-time efficiency deviation is less than the preset deviation threshold; 2. The method of claim 1, further comprising: determining that the power conversion circuit is in a steady state when the first time period reaches a preset steady state time.

3. Monitoring the real-time efficiency deviation based on the preset deviation threshold as described above, and obtaining a first time period during which the real-time efficiency deviation is less than the preset deviation threshold, monitoring the real-time efficiency deviation; When detecting that the real-time efficiency deviation is less than the preset deviation threshold, integrating the first time period; 3. The method for protecting a power conversion circuit according to claim 2, further comprising: resetting the first time when detecting that the real-time efficiency deviation is equal to or greater than the preset deviation threshold.

4. After obtaining the first time period during which the real-time efficiency deviation is less than the preset deviation threshold, the method further comprises:

3. The method of claim 2, further comprising determining that the power conversion circuit is in an unsteady state if the first time does not reach the predetermined steady state time.

5. When the power conversion circuit is in a steady state as described above, calculating the attenuation amount of the conversion efficiency of the power conversion circuit within a predetermined time period includes:

2. The method for protecting a power conversion circuit according to claim 1, further comprising: calculating a difference between a current conversion efficiency of the power conversion circuit and a conversion efficiency from the preset time ago, to obtain the amount of attenuation.

6. If the time that the power conversion circuit has entered a steady state is less than a target time threshold, the preset time is the time that the power conversion circuit has entered a steady state; 2. The method for protecting a power conversion circuit according to claim 1, wherein, when the time during which the power conversion circuit enters a steady state is equal to or greater than the target time threshold, the preset time is the target time threshold.

7. When the power conversion circuit is in a steady state as described above, calculating the attenuation amount of the conversion efficiency of the power conversion circuit within a predetermined time period includes: When the power conversion circuit enters a steady state as described above, collecting the conversion efficiency of the power conversion circuit at a predetermined collection interval; storing the conversion efficiencies in a queue of a preset capacity in the order of collection; obtaining a difference between head data and tail data in the queue to obtain the attenuation amount; 2. The method for protecting a power conversion circuit according to claim 1, wherein the predetermined time is a time between a time when the head data is collected and a time when the tail data is collected.

8. Storing the conversion efficiencies in a queue with a preset capacity in the order of collection as described above When the queue is full, performing a dequeue operation on the head data of the queue and storing the currently collected conversion efficiency as tail data in the queue; 8. The method of claim 7, further comprising: if the queue is not full, storing the currently collected conversion efficiency in the queue as tail data.

9. A power conversion apparatus comprising a power conversion circuit and a controller arranged to implement the steps of the method for protecting a power conversion circuit according to any one of claims 1 to 8.

10. A computer-readable storage medium storing a computer program that, when executed by a processor, causes the processor to implement the steps of the method for protecting a power conversion circuit according to any one of claims 1 to 8.

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