WO2023221526A1 - 一种电源系统的过流保护电路及装置 - Google Patents

一种电源系统的过流保护电路及装置 Download PDF

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Publication number
WO2023221526A1
WO2023221526A1 PCT/CN2022/143367 CN2022143367W WO2023221526A1 WO 2023221526 A1 WO2023221526 A1 WO 2023221526A1 CN 2022143367 W CN2022143367 W CN 2022143367W WO 2023221526 A1 WO2023221526 A1 WO 2023221526A1
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Prior art keywords
signal
circuit
power supply
supply system
sampling
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PCT/CN2022/143367
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English (en)
French (fr)
Inventor
康俊鹏
肖波
姚文海
黄朱勇
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华为数字能源技术有限公司
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Publication of WO2023221526A1 publication Critical patent/WO2023221526A1/zh

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
    • H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
    • H02H7/1203—Circuits independent of the type of conversion
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
    • H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/32—Means for protecting converters other than automatic disconnection

Definitions

  • the present invention relates to the technical field of circuit system protection, and in particular to an overcurrent protection circuit and device for a power supply system.
  • the power supply system with transformer isolation in the power module it usually includes the overcurrent protection hardware protection (Over Current Protect, OCP) circuit OCP1 on the primary side of the transformer and the overcurrent hardware protection circuit OCP2 on the secondary side/output side of the transformer.
  • OCP Over Current Protect, OCP
  • OCP1 Over Current Protect, OCP
  • OCP2 overcurrent hardware protection circuit
  • OCP2 overcurrent hardware protection circuit
  • the isolation communication delay of the primary and secondary sides of the transformer usually needs to be within 1us.
  • the winding short circuit fault A of the transformer is identified according to OCP1, and the output short circuit or large surge current fault B is identified based on OCP2. After the power system identifies two different faults, it will adopt different protection logic for different faults.
  • Embodiments of the present application provide an overcurrent protection circuit and device for a power supply system, which have the advantages of high reliability, simplified circuit, low cost, and simple control method.
  • inventions of the present application provide an overcurrent protection circuit for a power supply system.
  • the protection circuit includes: a transformer, the input end of the transformer is connected to the input end of the power supply system through a first power circuit; and the output end of the transformer passes through a first power circuit.
  • the second power circuit is connected to the output end of the power supply system; the first sampling circuit is used to collect the current signal at the input end of the transformer and output the first sampling signal; the overcurrent hardware protection circuit is used to measure the intensity of the first sampling signal.
  • the first processor is used to trigger the power supply system to block the wave according to the over-current protection signal;
  • the second sampling circuit is used to control the second Collect the electrical signal at the output end of the power circuit and output a second sampling signal;
  • the second processor is used to output the first signal;
  • the first signal includes: a second sampling signal; or, used to measure the intensity of the second sampling signal Make a judgment and output a first signal.
  • the first signal includes: first information and a second sampling signal; the first information is used to indicate whether an output overcurrent occurs at the output end of the power supply system; wherein, the power supply system performs wave blocking.
  • the first processor is also configured to receive a first signal. When the received first signal is within a first time threshold, the first processor determines whether to perform overcurrent protection on the output end of the power supply system based on the first signal.
  • the wave is first blocked based on the current signal collected at the input end of the power supply system, and then within a certain time interval, the subsequent continued wave generation of the power system is determined based on the current signal and/or voltage signal collected at the output end of the power supply system. Or shut down, so that in scenarios where the communication delay between the primary and secondary sides of the transformer is large, faults on the primary and secondary sides of the transformer can be effectively identified and protected.
  • the overcurrent/short-circuit fault protection of the primary side and secondary side of the transformer share an OCP point, that is, in the application of the present invention, only the OCP hardware protection circuit needs to be installed on the primary side of the transformer to identify Identify the type of fault when the power system fails and provide corresponding protection, which improves the reliability of the power system.
  • triggering the power supply system to block the wave includes: triggering the power supply system to cut off the transmission path of the power flow inside the power supply system.
  • the second processor is configured to: generate first information when the second sampling signal is a current value and the current value is greater than or equal to the second threshold, and the first information is used to indicate that an output occurs at the output end of the power system. overcurrent, or when the second sampling signal is a voltage value and the voltage value is less than or equal to the third threshold, the first information is generated. The first information is used to indicate that an output overcurrent has occurred at the output end of the power supply system; when the second sampling signal is a current The first information is generated when the current value is less than the second threshold.
  • the first information is used to indicate that no output overcurrent occurs at the output end of the power system, or when the second sampling signal is a voltage value and the voltage value is greater than the third threshold. First information is generated, and the first information is used to indicate that no output overcurrent occurs at the output end of the power supply system.
  • the second processor after receiving the second sampling signal, the second processor can judge the second sampling signal in advance and represent the judgment result with the first information. After receiving the first signal, the first processor can directly trigger the power supply system to enter corresponding protection action according to the first information.
  • determining whether to perform overcurrent protection on the output end of the power supply system based on the first signal includes: determining whether to perform overcurrent protection on the output end of the power supply system based on the first information carried in the first signal. ; Or, determine whether to perform overcurrent protection on the output end of the power supply system according to the signal strength of the second sampling signal carried in the first signal.
  • the first processor can determine whether to perform overcurrent protection on the output end of the power supply system in two ways.
  • it is preset to use the second processor to judge the second sampling signal
  • the first processor receives the first signal, it can directly determine whether to modify the power supply system based on the first information carried in the first signal.
  • the output terminal is protected against overcurrent.
  • the first processor can determine whether the signal strength of the second sampling signal carried in the first signal is Provide overcurrent protection to the output of the power system.
  • determining whether to perform overcurrent protection on the output terminal of the power supply system is based on the first information carried in the first signal, including: when the first information carried in the first signal indicates that the output terminal of the power supply system When an output overcurrent occurs, the first processor performs overcurrent protection on the output terminal of the power supply system; or, when the first information carried in the first signal indicates that no output overcurrent occurs at the output terminal of the power supply system, the first processor It is determined that a winding short-circuit fault occurs in the power system, triggers the power system to shut down and reports the fault.
  • the first signal output by the second processor carries the first information.
  • the first information indicates whether an output overcurrent occurs at the output end of the power system.
  • the first processor can directly determine whether overcurrent protection needs to be performed on the output terminal of the power supply system based on the first information.
  • determining whether to perform overcurrent protection on the output end of the power supply system based on the signal strength of the second sampling signal carried in the first signal includes: the first processor determines the second sampling signal, and when When the second sampling signal is a current value and the current value is greater than or equal to the second threshold, or when the second sampling signal is a voltage value and the voltage value is less than or equal to the third threshold, overcurrent protection is performed on the output end of the power system; when the second sampling signal is a current value and the current value is less than the second threshold, or when the second sampling signal is a voltage value and the voltage value is greater than the third threshold, it is determined that a winding short-circuit fault occurs in the power system, triggering the power system to shut down and reporting the fault.
  • a first processor will judge the second sampling signal. After the first processor receives the first signal. The first processor directly determines the signal strength of the second sampling signal to determine whether overcurrent protection needs to be performed on the output end of the power system.
  • determining whether to perform overcurrent protection on the output end of the power supply system according to the first signal includes: determining whether the first signal includes the first information; based on the first signal not including the first information, the first The processor determines whether to perform overcurrent protection on the output end of the power supply system based on the signal strength of the second sampling signal carried in the first signal; or based on the first information included in the first signal and the first information indicating the output of the power supply system.
  • the first processor performs overcurrent protection on the output terminal of the power supply system; or, based on the first signal including the first information, and the first information indicates that no output overcurrent occurs at the output terminal of the power supply system, The first processor determines that a winding short-circuit fault occurs in the power supply system, triggers the power supply system to shut down and reports the fault.
  • the first processor first determines whether the first signal contains the first information. If the first signal includes the first information, it means that the second processor has judged the second sampled signal. At this time, the first processor only needs to perform corresponding operations based on the judgment result (first information) of the second processor. If the first signal does not contain the first information. This means that the second processor does not judge the second sampling signal. At this time, the first processor is required to judge the second sampling signal carried in the first signal, and perform corresponding operations according to the judgment result.
  • the first processor is further configured to: determine whether the first signal is received within the second time threshold; based on the first processor not receiving the first signal within the second time threshold, When it is determined that a communication failure occurs in the power system, the first processor triggers a shutdown of the power system and reports the failure.
  • a second time threshold is set in advance.
  • the first processor does not receive the first signal within the second time threshold, it can be determined that a communication interruption occurs between the first processor and the second processor. At this time, the first processor triggers the power system to shut down and reports the fault.
  • the circuit further includes: a third sampling circuit; when the second sampling circuit is a current sampling circuit, the third sampling circuit is a voltage sampling circuit; the third sampling circuit is used to measure the second power circuit's The voltage at the output terminal is collected and a third sampling signal is output.
  • the second processor is further configured to: output a first signal according to the second sampling signal and the third sampling signal, where the first signal includes the second sampling signal and the third sampling signal; or to The signal strength of the signal and the third sampling signal is judged, and a first signal is output.
  • the first signal includes: first information, a second sampling signal and a third sampling signal; the first information is used to indicate whether the output end of the power supply system has The output overcurrent is detected; when the current value collected by the second sampling circuit is greater than or equal to the second threshold, and the voltage value collected by the third sampling circuit is less than or equal to the third threshold, first information is generated, and the first information is used to indicate the power system An output overcurrent occurs at the output terminal of the power supply system; when the current value collected by the second sampling circuit is less than the second threshold, first information is generated, and the first information is used to indicate that no output overcurrent occurs at the output terminal of the power supply system; or, when When the voltage value collected by the third sampling circuit is greater than the third threshold, first information is generated, and the first information is used to indicate that no output overcurrent occurs at the output end of the power supply system.
  • the current signal collected by the second sampling circuit and the voltage signal collected by the third sampling circuit are judged at the same time.
  • the collected current signal and voltage signal are both abnormal, it is determined that an overcurrent/short circuit fault has occurred at the output end of the power system.
  • the collected current signals and voltage signals are judged, which improves the accuracy of fault judgment at the output end of the power system.
  • the transformer is an isolation transformer.
  • inventions of the present invention also provide a power conversion device.
  • the power conversion device includes a power supply and an overcurrent protection circuit, wherein the overcurrent protection circuit is the overcurrent protection circuit of the first aspect; the power supply is used for This overcurrent protection circuit supplies power.
  • Figure 1 is a schematic diagram of an existing overcurrent protection circuit of a power supply system
  • Figure 2 is a timing diagram after the existing power supply system fails
  • Figure 3 is a schematic structural diagram of an overcurrent protection circuit of a power supply system provided by an embodiment of the present application
  • Figure 4a is a schematic structural diagram of another overcurrent protection circuit of a power supply system provided by an embodiment of the present application.
  • Figure 4b is a schematic structural diagram of another overcurrent protection circuit of a power supply system provided by an embodiment of the present application.
  • Figure 5 is a schematic structural diagram of another overcurrent protection circuit of a power supply system provided by an embodiment of the present application.
  • Figure 6 is a timing diagram of an overcurrent protection circuit of a power supply system provided by an embodiment of the present application.
  • FIG. 7 is a flow chart of an overcurrent protection method for a power supply system provided by an embodiment of the present application.
  • any embodiment or design solution that is "exemplary”, “such as” or “for example” should not be construed as being more preferred or advantageous than other embodiments or design solutions. . Rather, use of the words “exemplary,” “such as,” or “for example” is intended to present the concepts in a concrete manner.
  • first and second are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the indicated technical features. Therefore, features defined as “first” and “second” may explicitly or implicitly include one or more of these features.
  • the terms “including,” “includes,” “having,” and variations thereof all mean “including but not limited to,” unless otherwise specifically emphasized.
  • Power conversion device It is an electronic device that converts power. It generally includes power conversion in the input part and power conversion in the output part. For example, AC input is converted into DC output through a power conversion device.
  • OCP Over Current Protection
  • Scheme 1 is shown in Figure 1.
  • a first sampling circuit and a first hardware overcurrent protection circuit are provided on the primary side of the transformer, and a second sampling circuit is provided at the output end of the second power circuit.
  • circuit and a third sampling circuit and a second hardware overcurrent protection circuit are provided on the primary side of the transformer.
  • the current or voltage collected by the first sampling circuit is reported to the first processor.
  • the first processor determines that a winding short circuit occurs on the primary side or secondary side of the transformer.
  • the first processor triggers the first hardware overcurrent protection circuit to perform driver protection on the power system (performing OCP1 protection). Further, the first processor triggers the power supply system to shut down and report a fault.
  • the second sampling circuit and the third sampling circuit report the collected current or voltage to the second processor.
  • the second processor determines that a short circuit occurs at the output end of the power system or a surge current is output.
  • the second processor triggers a second hardware overcurrent protection circuit for protection (OCP2 protection).
  • OCP2 protection Specifically, the second hardware overcurrent protection circuit transmits the blocking signal to the primary side of the transformer, blocks the drive of the primary side of the transformer, and re-generates the wave within a fixed interval. If the OCP2 protection is triggered several times in a row, the power supply The system reports a fault and shuts down.
  • overcurrent hardware protection circuits (the first overcurrent hardware protection circuit and the second overcurrent hardware protection circuit) are installed on both the primary and secondary circuits of the transformer.
  • the communication delay between the circuit and the secondary circuit needs to be controlled within 1us.
  • the first overcurrent hardware protection circuit and the second overcurrent hardware protection circuit are used to perform different logic protections. Therefore, the protection threshold of the first hardware overcurrent protection circuit is set higher than the protection threshold of the second hardware overcurrent protection circuit to ensure that the first hardware overcurrent protection will not be triggered when the second hardware overcurrent protection circuit is triggered. circuit.
  • the above solution still has the following shortcomings:
  • the protection threshold of the second hardware overcurrent protection circuit is set relatively low, in situations such as output overload, the second hardware overcurrent protection circuit can easily be triggered, affecting the performance of the product. If the protection threshold of the second hardware overcurrent protection circuit is set relatively high. In the case of output short circuit, after the second overcurrent protection circuit is triggered, plus the communication delay between the primary side and the secondary side of the transformer, the current of the primary side transistor of the transformer is relatively large when it is blocking the wave, and there will be high stress. It may cause stress failure of the transistor and fail to provide fault protection.
  • the hardware circuit implementation of the above solution is complex and requires two overcurrent hardware protection circuits and two hardware overcurrent protection thresholds to identify different faults. If the protection threshold of the first overcurrent protection circuit and the protection threshold of the second overcurrent protection circuit are set to the same one, different faults cannot be distinguished. For example, when protecting against a fault on the output side, if the protection threshold of the first hardware overcurrent protection circuit is used for wave blocking protection, the power conversion device cannot distinguish whether the fault is a short circuit in the primary or secondary winding of the transformer or a short circuit in the output side. Different protection measures cannot be enabled for this fault.
  • FIG. 3 is a schematic structural diagram of an overcurrent protection circuit of a power supply system provided by an embodiment of the present invention. As shown in Figure 3, it includes: a first processor, a first power circuit, a first sampling circuit, an overcurrent hardware protection circuit (OCP), a transformer, a second power circuit, a second sampling circuit, a third sampling circuit, and a third sampling circuit. Two processors.
  • OCP overcurrent hardware protection circuit
  • One end of the first power circuit is connected to the input end of the power supply system, and the other end of the first power circuit is connected to one end of the transformer through the first sampling circuit.
  • the other end of the transformer is connected to one end of the second power circuit.
  • the other end of the second power circuit is connected to the output end of the power supply system.
  • the first sampling circuit is also connected to the first processor through the OCP circuit.
  • the second sampling circuit and the third sampling circuit are respectively connected to the output terminals of the second processor and the second power circuit.
  • the first processor and the second processor communicate in a high-voltage isolation high-speed communication manner.
  • the transformer is an isolation transformer.
  • the first processor and the second processor can be processors such as a main control chip, a control unit, a digital processor, an FPGA chip, a combination of an MCU and an FPGA chip.
  • the processor compares the received current value and voltage value with a preset threshold.
  • the current value or voltage value used for comparison can be the instantaneous value collected by the sampling circuit, or the effective value of the current value/voltage value collected within a period of time, or the average value of the current value/voltage value collected within a certain period of time. In the embodiment of this application, this is not limited.
  • the first sampling circuit collects the current signal on the primary circuit of the transformer in real time, and sends the collected current signal to the OCP circuit.
  • the OCP circuit compares the received current signal with the preset reference current value (overcurrent protection threshold of the OCP circuit). Compare. When the current value collected by the first sampling circuit is higher than the overcurrent protection threshold of the OCP circuit, the OCP circuit generates a corresponding OCP signal and sends the OCP signal to the first processor.
  • the first processor determines that the power supply system has failed and triggers the OCP circuit to block the power supply system. Blocking the power supply system means that the drive of the transistors in the power supply system is interrupted and the internal power flow transmission path of the power supply system is cut off. .
  • the first processor continues to judge the fault type of the power system, and executes corresponding protection logic according to the judgment result.
  • the current value collected by the first sampling circuit exceeds the protection threshold of the OCP circuit.
  • a winding short circuit/overcurrent occurs in the primary circuit or secondary circuit of the transformer.
  • the first processor continues to receive the signal.
  • the first signal sent by the second processor received by the first processor within the first time threshold determines that the current value of the output terminal is less than the preset current value, or the voltage value of the output terminal is greater than the preset voltage value
  • the first process It is determined that the current fault in the power system is a winding short circuit/overcurrent on the primary or secondary side of the transformer.
  • the first processor triggers the current power supply system to report a fault and shuts down the system.
  • the second sampling circuit is a current sampling circuit and the third sampling circuit is a voltage sampling circuit as an example for explanation.
  • the second processor After the first processor triggers the power system to block the wave according to the OCP signal, the second processor outputs the first signal according to the current value and voltage value collected at the output end. Specifically, the second processor compares the received current signal and voltage signal with preset current thresholds and voltage thresholds, and generates first information. The first information is used to indicate whether output occurs at the output end of the power supply system. Overcurrent;.
  • the first information generated by the second processor the first information is used to indicate that an output overcurrent has occurred at the output end of the power system. Otherwise, the second processor outputs the first information for indication. Then the second processor sends a first signal to the first processor, and the first signal carries the second sampling signal, the third sampling signal and the first information. Alternatively, after the second processor receives the current value and voltage value collected at the output end, the second processor directly sends the first signal to the first processor, and the first signal includes the current value and voltage value.
  • the first information may be a flag bit.
  • the flag bit can be 0 or 1. When the flag bit is 0, it indicates that no output overcurrent occurs at the output end of the power system. When the flag bit is 1, it indicates that an output overcurrent has occurred at the output end of the power system.
  • two sampling circuits can be set up at the output end of the power supply system to simultaneously collect the current value and voltage value at the output end of the power supply system, and collect the The current value and voltage value are used to determine whether a short circuit or overcurrent fault occurs at the output end of the power system.
  • the second processor judges the received sampling signal, it can judge the collected electrical signal through corresponding software, and it can also judge the collected electrical signal based on the circuit inside the second processor. , generate a protection signal.
  • the second processor judges the received sampling signal, it can judge the collected electrical signal through corresponding software, and it can also judge the collected electrical signal based on the circuit inside the second processor. , generate a protection signal.
  • the specific judgment method of the sampled signal by the second processor there is no limitation on the specific judgment method of the sampled signal by the second processor.
  • one sampling circuit when sampling the current and voltage at the output, one sampling circuit can be triggered first and then another sampling circuit, with a short triggering time interval between the two sampling circuits.
  • the first processor receives the first signal sent by the second processor. When the received first signal is within the first time threshold, the first processor determines whether to trigger the power supply system to enter the output short circuit/overcurrent protection logic according to the first signal. . Specifically, when the first processor determines based on the first signal received within the first time threshold that the current value of the output terminal is greater than or equal to the preset current value and the voltage value of the output terminal is less than or equal to the preset voltage value, the power supply system is triggered. Enter the output short circuit/overcurrent protection logic. Otherwise, the first processor determines that a winding short-circuit fault occurs in the power supply system, and the first processor triggers a shutdown of the power supply system and reports the fault.
  • the first processor determines whether the current value of the output terminal is greater than or equal to the preset current value and whether the voltage value of the output terminal is less than or equal to the preset voltage value based on the first signal received within the first time threshold.
  • Method 1 Set the second processor in advance to judge the signal collected by the sampling circuit at the output end. After receiving the first signal, the first processor determines the first information carried in the first signal. When the first information carried in the first signal indicates that an output overcurrent occurs at the output end of the power supply system, the power supply system is triggered to enter the output end short circuit/overcurrent protection logic. When the first information carried in the first signal indicates that no output overcurrent occurs at the output end of the power system, the first processor determines that a winding short-circuit fault occurs in the power system, and triggers the power system to shut down and reports the fault.
  • Method 2 The first processor is preset to judge the electrical signal collected at the output end. After receiving the first signal, the first processor determines the current value and voltage value carried in the first signal. When the current value carried in the first signal is greater than or equal to the preset current value and the voltage value carried in the first signal is less than or equal to the preset voltage value, the first processor triggers the power supply system to enter output short circuit/overcurrent protection. logic. Otherwise, the first processor determines that a winding short-circuit fault occurs in the power system, and the first processor triggers the power system to shut down and reports the fault.
  • a low-configuration second processor can be selected to save costs, or the second processor can be omitted and a communication circuit can be used to transmit the current values and voltage values collected by the second sampling circuit and the third sampling circuit.
  • the first processor receives the first signal within a first time threshold.
  • the first processor first determines whether the first signal includes first information. When the first signal carries the first information, and the first information indicates that an output overcurrent occurs at the output end of the power supply system, the first processor performs overcurrent protection on the output end of the power supply system; when the first signal carries When the first information indicates that no output overcurrent occurs at the output end of the power supply system, the first processor determines that a winding short-circuit fault occurs in the power supply system, triggers the power supply system to shut down and reports the fault.
  • the first processor makes a judgment based on the current value and voltage value carried in the first signal.
  • the first processor triggers the power supply system to enter output short circuit/overcurrent protection. logic. Otherwise, the first processor determines that a winding short-circuit fault occurs in the power system, and the first processor triggers the power system to shut down and reports the fault.
  • the first processor triggers the power system to generate waves N times at a fixed time interval, where N is an integer greater than or equal to 1. If each time the wave is sent, the first processor can determine based on the first signal received within the first time threshold that the current value of the output terminal is greater than or equal to the preset current value and the voltage value of the output terminal is less than or equal to the preset voltage value. Then the first processor determines that an output short circuit or overcurrent fault occurs at the output end of the power supply system, and the first processor triggers the power supply system to report the fault and shut down the system.
  • the first processor determines based on the received first signal that the current value of the output terminal is less than the preset current value, or the voltage value of the output terminal is greater than the preset voltage value. , the first processor determines that a winding short-circuit fault occurs in the power system, and the first processor triggers a shutdown of the power system and reports the fault. If there is a wave in the process of N waves, the first processor does not receive the first signal within the second time threshold, the first processor determines that a communication failure occurs in the power system, and the first processor triggers The power system shuts down and reports the fault.
  • the first processor blocks the power supply system according to the OCP signal, it is determined whether the first processor receives the first signal sent by the second processor within the second time threshold. Based on the first processor not receiving the first signal within the second time threshold, the first processor determines that communication between the first processor and the second processor is interrupted. The first processor triggers the current power supply system to report a fault and shuts down the system.
  • the second time threshold can be set in advance as needed.
  • FIG. 3 is an example diagram of the overcurrent protection circuit and is not used to limit the overcurrent protection circuit of the power supply system.
  • the overcurrent protection circuit as shown in Figure 3, between the first sampling circuit and the OCP circuit, between the second sampling circuit and the second processor, between the third sampling circuit and the second processing There may also be signal amplification circuits, filter circuits and other circuits between the devices.
  • the OCP circuit may be disposed on the circuit board on which the first processor is located. Or the OCP circuit can be arranged on the circuit board where the first power circuit is located. Or the OCP circuit is provided inside the first processor. When the OCP circuit is disposed inside the first processor, the first sampling circuit only needs to send the sampling signal to the first processor, and the circuit inside the first processor generates an OCP signal.
  • the connection method of the three power circuits and two transformers can be as shown in Figure 4a.
  • the connection method of the six power circuits and three transformers can be as shown in Figure 4b. Referring to Figure 4b, multiple power circuits on the primary sides of multiple transformers (input ends of the power supply system) are connected in series, and multiple power circuits on the output ends of the power supply system are connected in parallel.
  • the wave is first blocked based on the current signal collected at the input end of the power supply system, and then within a certain time interval, the subsequent steps of the power supply system are determined based on the current signal and/or voltage signal collected at the output end of the power supply system.
  • the short-circuit fault of the primary and secondary windings of the transformer and the short-circuit/over-current fault of the output terminal of the power supply system share an OCP protection point. That is to say, in the application of the present invention, only one OCP hardware circuit is needed to identify the type of fault when the power supply system fails and perform corresponding protection, thereby improving the reliability of the power supply system.
  • FIG. 5 is a schematic circuit structure diagram of a specific embodiment of the overcurrent protection circuit shown in FIG. 3 .
  • the first sampling circuit includes a current transformer (CT), a rectifier, and a first resistor R1.
  • CT current transformer
  • the current transformer obtains current from the primary winding circuit of the transformer. After the output side of the current transformer passes through the rectifier circuit, it flows through the first resistor R1.
  • the voltage divided on the first resistor R1 is the sampling signal of the first sampling unit. By adjusting the resistance of the first resistor R1, the sampling signal amplitude of the first sampling unit can be adjusted.
  • the OCP circuit includes a comparator, at least one resistor, and at least one capacitor.
  • the inverting input end of the comparator in the OCP circuit is connected to the output end of the first sampling circuit, the non-inverting input end of the comparator inputs the comparison reference voltage value of the OCP circuit (the overcurrent protection threshold of the OCP circuit), and the output of the comparator
  • the terminal is connected to the first processor.
  • the output terminal of the comparator outputs the OCP signal to the first processor.
  • the first processor triggers the corresponding protection logic.
  • the first processor determines that a fault occurs in the power supply system and triggers the OCP circuit to block the power supply system.
  • the second sampling circuit collects the current signal at the output end of the power system in real time.
  • the second sampling circuit includes a second resistor R2, which is connected in series in the second power circuit loop. By adjusting the resistance of the second resistor R2, the amplitude of the sampling signal output by the second sampling unit can be adjusted.
  • the third sampling circuit collects the voltage signal at the output end of the power system in real time.
  • the third sampling circuit includes a third resistor R3 and a fourth resistor R4.
  • the third resistor R3 and the fourth resistor R4 divide the voltage output by the second power circuit through series connection to realize the output of the sampling signal.
  • the first sampling circuit collects that the current signal on the primary side of the transformer exceeds the overcurrent protection threshold of the OCP circuit at time t1, and the OCP circuit sends the OCP signal to the first processor, so that the first processor Block the power supply system.
  • the second sampling circuit and the third sampling circuit collect the electrical signals at the output end of the power system in real time, and send the collected current values and voltage values to the second processor.
  • the second processor sends a signal to the first processor.
  • the first signal is delivered to the first processor at time t2.
  • the first signal carries first information, and the first information indicates that an output overcurrent or an output short circuit occurs at the output end of the power supply system. If the first processor receives the first signal within the interval td, and the first signal carries the first information, the first processor triggers the power system to re-send waves within a fixed time interval.
  • the first processor receives the first signal at a time interval td>t2-t1.
  • the first processor uses the overcurrent protection signal output by the OCP circuit as the first wave blocking signal. . Then, the second processor outputs the first signal according to the second sampling signal and the third sampling signal, and sends the first signal to the first processor as a determination condition for subsequent wave generation or shutdown. That is to say, in the application embodiment of the present invention, only one overcurrent protection hardware circuit needs to be set up to identify the type of fault when the power supply system fails and perform corresponding protection, thereby improving the reliability of the power supply system.
  • FIG. 6 is a flow chart of an overcurrent protection method for a power supply system provided by an embodiment of the present application. The method is executed by the first processor in the circuit shown in FIG. 3 or FIG. 5 . Referring to Figure 6, the method includes: step S601-step S604.
  • Step S601 Receive an overcurrent protection signal sent by the OCP circuit, and trigger the power supply system to perform wave blocking according to the overcurrent protection signal.
  • the first sampling circuit acquires the current signal on the primary side of the transformer in real time, and sends the acquired current signal to the OCP circuit.
  • the OCP circuit compares the current signal sent by the first sampling circuit with the preset OCP overcurrent protection threshold. When the current value collected by the first sampling circuit is greater than the preset OCP overcurrent protection threshold, the OCP circuit sends a signal to the first processor. Send overcurrent protection signal (OCP signal).
  • OCP signal Send overcurrent protection signal
  • the first processor triggers the power supply system to block the wave according to the overcurrent protection signal.
  • blocking the power supply system means that the drive of the transistors in the power supply system is interrupted and the power flow transmission path within the power supply system is cut off.
  • Step S602 Receive the first signal sent by the second processor, and when the received first signal is within the first time threshold, determine whether to perform overcurrent protection on the output end of the power supply system based on the first signal.
  • the second processor is preset to judge the signal collected by the sampling circuit at the output end. After receiving the first signal, the first processor determines the first information carried in the first signal. Step S603 is executed when the first information carried in the first signal indicates that an output overcurrent or output short circuit occurs at the output end of the power supply system. When the first information carried in the first signal indicates that no output overcurrent or output short circuit occurs at the output end of the power supply system, step S604 is executed.
  • the first processor is preset to judge the electrical signal collected at the output end. After the first processor receives the first signal, the first processor determines the current value and voltage value carried in the first signal. When the current value carried in the first signal is greater than or equal to the first threshold value and the current value carried in the first signal When the voltage value is less than or equal to the third threshold, step S603 is executed; otherwise, step S604 is executed.
  • step S603 is executed.
  • step S604 is executed.
  • step S604 determines the current value and voltage value carried in the first signal.
  • step S603 is executed; otherwise, step S604 is executed.
  • the current signal at the output end of the power supply system is acquired through the second sampling circuit, and the voltage signal at the output end of the power supply system is acquired through the third sampling circuit. Then the second sampling circuit sends the acquired current signal, and the third sampling circuit sends the acquired voltage signal to the second processor.
  • the second processor compares the received current signal and voltage signal with the preset current threshold and voltage threshold, and generates first information. The first information is used to indicate whether an output overcurrent or overcurrent occurs at the output end of the power system. Output short circuit.
  • the first information generated by the second processor Indicates that an output overcurrent or output short circuit has occurred at the output end of the power system. Otherwise, the first information generated by the second processor indicates that no output overcurrent or output short circuit occurs at the output terminal of the power supply system. Then the second processor sends a first signal to the first processor, and the first signal carries the second sampling signal, the third sampling signal and the first information.
  • the second processor directly transfers the current signal value acquired by the second sampling circuit. and the voltage signal value obtained by the third sampling circuit is sent to the first processor as a first signal.
  • the timing diagram of the overcurrent protection scheme of the power system shown in Figure 6 is shown in Figure 7 .
  • the first sampling circuit performs sampling at time t1, and the first processor receives the first signal sent by the second processing at time t2.
  • the first time threshold td >t2-t1.
  • the first processor finds that the communication between the first processor and the second processor is interrupted at time t3, the first processor triggers the power system to shut down and reports the fault. Among them, t3>t1.
  • Step S603 the first processor triggers the power system to enter the output short circuit/overcurrent protection logic.
  • the first processor triggers the power system to generate waves N times at a fixed time interval, where N is an integer greater than or equal to 1. If each time the wave is sent, the first processor can determine based on the first signal received within the first time threshold that the current value of the output terminal is greater than or equal to the preset current value and the voltage value of the output terminal is less than or equal to the preset voltage value. Then the first processor determines that an output short circuit or overcurrent fault occurs at the output end of the power supply system, and the first processor triggers the power supply system to report the fault and shut down the system.
  • the first processor determines based on the received first signal that the current value of the output terminal is less than the preset current value, or the voltage value of the output terminal is greater than the preset voltage value. , the first processor determines that a winding short-circuit fault occurs in the power system, and the first processor triggers a shutdown of the power system and reports the fault. If there is a wave in the process of N waves, the first processor does not receive the first signal within the second time threshold, the first processor determines that a communication failure occurs in the power system, and the first processor triggers The power system shuts down and reports the fault.
  • the judgment logic of output short circuit/overcurrent protection described in the above example is only a specific application scenario in the embodiment of the present application.
  • the first processor triggers the power system to wait for a fixed time interval before sending a wave, and after sending N waves continuously, triggers the power system to shut down.
  • the specific application scenarios of the judgment logic of output short circuit/overcurrent protection are not limited.
  • Step S604 determine that a winding short-circuit fault occurs in the power supply system, trigger the power supply system to shut down and report the fault.
  • wave blocking is first performed based on the electrical signal collected by the first sampling circuit. Then, the type of fault in the current power supply system is determined based on the electrical signals collected by the second sampling circuit and the third sampling circuit. Then the corresponding protection logic is triggered according to different fault types.
  • the short-circuit fault of the primary and secondary windings of the transformer and the short-circuit/over-current fault of the output terminal of the power supply system share an OCP protection point. That is to say, in the application of the present invention, only one OCP hardware circuit is needed to identify the type of fault when the power supply system fails and perform corresponding protection.
  • An embodiment of the present application also provides a power conversion device, which includes an overcurrent protection circuit.
  • the specific structure of the overcurrent protection circuit refers to the above embodiment.
  • the power conversion device in the embodiment of the present application adopts all the technical solutions of all the embodiments of the over-current protection circuit mentioned above, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned over-current protection circuit embodiments, I won’t go into details here.
  • the functions described in the present invention can be implemented by hardware, software, firmware, or any combination thereof.
  • the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium.

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Abstract

本发明提供一种电源系统的过流保护电路及电力变换装置。该电路包括：变压器、第一采样电路、第二采样电路、第一处理器、第二处理器。其中，第一采样电路用于对变压器输入端的电流信号进行采集，当变压器输入端的电流信号的强度值大于第一阈值时，第一处理器触发保护电路对该电源系统进行封波。第二采样电路用于对电源系统输出端的电信号进行采集，并输出第二采样信号。第二处理器用于根据第二采样信号输出第一信号，并向第一处理器发送第一信号作为后续发波或者关机的判定条件。即在本发明申请实施例中，只需要设置一个过流保护硬件电路就可以识别出电源系统发生故障时故障的类型并进行相应的保护，提升了电源系统的可靠性。

Description

一种电源系统的过流保护电路及装置
本申请要求在2022年05月16日提交中国国家知识产权局、申请号为202210528724.8，发明名称为“一种电源系统的过流保护电路及装置”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本发明涉及电路系统保护技术领域,尤其涉及一种电源系统的过流保护电路及装置。
背景技术
在电源模块带变压器隔离的电源系统中，通常包括变压器原边的电流过流硬件保护(Over Current Protect，OCP)电路OCP1、变压器副边/输出侧电流过流硬件保护电路OCP2。在变压器的原副边压差比较低的情况下，可以用时延较小的隔离器件来满足原副边的隔离通信要求。变压器的原副边的隔离通信时延通常需要在1us以内。当该电源系统发生故障时，在故障情形下依据OCP1识别变压器的绕组短路故障A，以及OCP2识别输出短路或浪涌大电流故障B。电源系统识别出两种不同的故障以后，会对不同的故障采用不同的保护逻辑。
但是，现有方案在变压器原副边通信时延较大(10us甚至更大)的场景下，存在无法有效识别故障A和故障B的问题，即不能有效的针对不同的故障进行不同的逻辑保护，使得电源系统的稳定性和可靠性降低，存在较高的风险。
发明内容
本申请实施例提供了一种电源系统的过流保护电路及装置，具备可靠性高、电路精简、成本低，控制方式简单等优点。
第一方面，本申请实施例提供了一种电源系统的过流保护电路，该保护电路包括：变压器，变压器的输入端通过第一功率电路与电源系统的输入端连接；变压器的输出端通过第二功率电路与电源系统的输出端连接；第一采样电路，用于对变压器输入端的电流信号进行采集，并输出第一采样信号；过流硬件保护电路，用于对第一采样信号的强度进行判断，当第一采样信号的强度大于第一阈值时，输出过流保护信号；第一处理器，用于根据过流保护信号触发电源系统进行封波；第二采样电路，用于对第二功率电路的输出端的电信号进行采集，并输出第二采样信号；第二处理器，用于输出第一信号；第一信号包括：第二采样信号；或者，用于对第二采样信号的强度进行判断，并输出第一信号，第一信号包括：第一信息和第二采样信号；第一信息用于指示所电源系统的输出端是否发生了输出过流；；其中，电源系统进行封波以后，第一处理器还用于接收第一信号，当接收的第一信号在第一时间阈值内时，第一处理器根据第一信号确定是否对电源系统的输出端进行过流保护。
在上述方案中，先根据电源系统输入端采集的电流信号进行封波，然后在一定的时间间隔内，根据电源系统输出端采集到的电流信号和/或电压信号来确定电源系统后续继续发波还是关机，使得在变压器原边、副边通信时延较大的场景下，能够有效的识别变压器原边、副边的故障并进行保护。进一步地，在本方案中，变压器的原边和副边的过流/短路故障保护共用一个OCP点，即在本发明申请中，只需要在变压器的原边设置OCP硬件保护电路，就可以识别出电源系统发生故障时故障的类型并进行相应的保护，提升了电源系统的可靠性。
在一个可能的实现方式中，触发电源系统进行封波包括：触发电源系统切断电源系统内部的功率流的传输路径。在一个可能的实现方式中，第二处理器用于：当第二采样信号为电流值且电流值大于等于第二阈值时产生第一信息，第一信息用于指示电源系统的输出端发生了输出过流，或者当第二采样信号为电压值且电压值小于等于第三阈值时产生第一信息，第一信息用于指示电源系统的输出端发生了输出过流；当第二采样信号为电流值且电流值小于第二阈值时产生第一信息，第一信息用于指示电源系统的输出端未发生输出过流，或者当第二采样信号为电压值且所述电压值大于第三阈值时产生第一信息，第一信息用于指示电源系统的输出端未发生输出过流。
也就是说，第二处理器接收到第二采样信号以后，可以预先对第二采样信号进行判断，并将判断结果用第一信息进行表示。使得第一处理器接收到第一信号以后，可以根据第一信息直接触发电源系统进入相应的保护动作。
在一个可能的实现方式中，根据第一信号确定是否对电源系统的输出端进行过流保护，包括：根据第一信号中携带的第一信息，确定是否对电源系统的输出端进行过流保护；或者，根据第一信号中携带的第二采样信号的信号强度确定是否对所述电源系统的输出端进行过流保护。
也就是说，第一处理器接收到第一信号以后，可以通过两种方式来确定是否对电源系统的输出端进行过流保护。当预先设定了通过第二处理器来对第二采样信号进行判断时，第一处理器接收到第一信号以后，可以直接根据第一信号中携带的第一信息来确定是否对电源系统的输出端进行过流保护。当预先设定了通过第一处理器来对第二采样信号进行判断时，第一处理器接收到第一信号以后，可以通过对第一信号中携带的第二采样信号的信号强度来确定是否对电源系统的输出端进行过流保护。
在一个可能的实现方式中，根据第一信号中携带的第一信息，确定是否对电源系统的输出端进行过流保护，包括：当第一信号中携带的第一信息指示电源系统的输出端发生输出过流时，第一处理器对电源系统的输出端进行过流保护；或者，当第一信号中携带的第一信息指示电源系统的输出端未发生输出过流时，第一处理器确定电源系统发生绕组短路故障，触发电源系统关机并上报故障。
也就是说，如果预先设定了通过第二处理器来对第二采样信号进行判断，那么第二处理器输出的第一信号中携带有第一信息。当第一信息指示电源系统的输出端是否发生输出过流。第一处理器可以直接根据第一信息确定是否需要对电源系统的输出端进行过流保护。
在一个可能的实现方式中，根据第一信号中携带的第二采样信号的信号强度确定是否对电源系统的输出端进行过流保护，包括：第一处理器对第二采样信号进行判断，当第二采样信号为电流值且电流值大于等于第二阈值，或者当第二采样信号为电压值且电压值小 于等于第三阈值时对电源系统的输出端进行过流保护；当第二采样信号为电流值且电流值小于第二阈值，或者当第二采样信号为电压值且电压值大于第三阈值时确定电源系统发生绕组短路故障，触发电源系统关机并上报故障。
也就是说，如果预先确定有第一处理器对第二采样信号进行判断。第一处理器接收第一信号以后。第一处理器直接对第二采样信号的信号强度进行判断，以确定是否需要对电源系统的输出端进行过流保护。
在一个可能的实现方式中，根据第一信号确定是否对电源系统的输出端进行过流保护，包括：确定第一信号是否包括第一信息；基于第一信号中不包括第一信息，第一处理器根据第一信号中携带的第二采样信号的信号强度确定是否对电源系统的输出端进行过流保护；或者，基于第一信号中包括第一信息，且第一信息指示电源系统的输出端发生输出过流，第一处理器对电源系统的输出端进行过流保护；或者，基于第一信号中包括第一信息，且该第一信息指示电源系统的输出端未发生输出过流，第一处理器确定所述电源系统发生绕组短路故障，触发电源系统关机并上报故障。
也就是说，如果预先没有确定由哪一个处理器对输出端采集的第二采样信号进行判断。那么第一处理器接收到第一信号以后，首先判断第一信号中是否包含第一信息。如果第一信号中包括第一信息，则表示第二处理器已经对第二采样信号进行过判断。此时第一处理器只需要根据第二处理器的判断结果(第一信息)执行相应的操作。如果第一信号中没有包含第一信息。则表示第二处理器没有对第二采样信号进行判断。此时需要第一处理器对第一信号中携带的第二采样信号进行判断，并根据判断结果执行相应的操作。
在一个可能的实现方式中，所述第一处理器还用于：确定在第二时间阈值内是否接收到第一信号；基于第一处理器在第二时间阈值内没有接收到第一信号，确定电源系统发生通信故障，第一处理器触发电源系统关机并上报故障。
也就是说，预先设置一个第二时间阈值，当第一处理器在第二时间阈值内没有接收到第一信号，就可以判断第一处理器和第二处理器之间发生了通信中断。此时，第一处理器触发电源系统关机并上报该故障。
在一个可能的实现方式中，该电路还包括：第三采样电路；当第二采样电路为电流采样电路时，第三采样电路为电压采样电路；第三采样电路用于对第二功率电路的输出端的电压进行采集，并输出第三采样信号。
也就是说，通过在上述电源系统的输出端增加一个采样电路，以提高对电源系统输出端的故障判断的准确性。
在一个可能的实现方式中，第二处理器还用于：根据第二采样信号和第三采样信号输出第一信号，第一信号包括第二采样信号和第三采样信号；或者对第二采样信号和第三采样信号的信号强度进行判断，并输出第一信号，第一信号包括：第一信息、第二采样信号和第三采样信号；第一信息用于指示电源系统的输出端是否发生了输出过流；当第二采样电路采集的电流值大于等于第二阈值，且第三采样电路采集的电压值小于等于第三阈值时，产生第一信息，该第一信息用于指示电源系统的输出端发生了输出过流；当第二采样电路采集的电流值小于第二阈值时，产生第一信息，该第一信息用于指示电源系统的输出端未发生输出过流；或者，当第三采样电路采集的电压值大于第三阈值时，产生第一信息，该第一信息用于指示所述电源系统的输出端未发生输出过流。
也就是说，同时对第二采样电路采集的电流信号以及对第三采样电路采集的电压信号进行判断。当采集的电流信号和电压信号都发生异常时，确定电源系统的输出端发生了过流/短路故障。同时对采集的电流信号和电压信号进行判断，提高了对电源系统输出端故障判断的准确性。
在一个可能的实现方式中，变压器为隔离变压器。
第二方面，本发明申请实施例还提供了一种电力变换装置，该电力变换装置包括电源和过流保护电路，其中过流保护电路为上述第一方面的过流保护电路；电源用于为该过流保护电路供电。
附图说明
为了更清楚地说明本发明实施例的技术方案，下面将对实施例描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其它的附图。
图1为现有的电源系统的过流保护电路的示意图；
图2为现有的电源系统发生故障后的时序图；
图3为本申请实施例提供的一种电源系统的过流保护电路的结构示意图；
图4a为本申请实施例提供的又一种电源系统的过流保护电路的结构示意图；
图4b为本申请实施例提供的又一种电源系统的过流保护电路的结构示意图；
图5为本申请实施例提供的又一种电源系统的过流保护电路的结构示意图；
图6为本申请实施例提供的一种电源系统的过流保护电路的时序图；
图7为本申请实施例提供的一种电源系统的过流保护方法的流程图。
具体实施方式
为了使本申请实施例的目的、技术方案和优点更加清楚，下面将结合附图，对本申请实施例中的技术方案进行描述。
在本申请实施例中的描述中，“示例性的”、“例如”或者“举例来说”的任何实施例或设计方案不应该被理解为比其他实施例或设计方案更优选或更具优势。确切而言，使用“示例性的”、“例如”或者“举例来说”等词旨在以具体方式呈现相关概念。
此外，术语“第一”、“第二”仅用于描述目的，而不能理解为指示或暗示相对重要性或者隐含指明所指示的技术特征。由此，限定有“第一”、“第二”的特征可以明示或者隐含地包括一个或者更多个该特征。术语“包括”、“包含”、“具有”及它们的变形都意味着“包括但不限于”，除非是以其他方式另外特别强调。
在介绍本方案之前，首先对本方案中需要使用到的术语进行介绍，
电力变换装置：是一种针对电力进行变换的电子装置，一般包括输入部分的电力变换和输出部分的电力变换。比如，将交流输入经过电力变换装置变换为直流输出。
过流保护(Over Current Protect，OCP)：当电流超出保护阈值时，会有相应的保护动作以避免电力变换装置失效。
为了对电源系统的故障进行检测，方案一如图1所示，在变压器的原边设置有第一采样电路、第一硬件过流保护电路，在第二功率电路的输出端设置有第二采样电路和第三采样电路以及第二硬件过流保护电路。
第一采样电路采集到的电流或者电压上报给第一处理器。当第一采样电路采集的电流或者电压超过第一保护阈值时，第一处理器确定变压器的原边或者副边发生了绕组短路。此时，第一处理器触发第一硬件过流保护电路对该电源系统进行封驱动保护(进行OCP1保护)。进一步地，第一处理器触发该电源系统进行关机并上报故障。
第二采样电路和第三采样电路将采集的电流或者电压上报给第二处理器。当所述第二采样电路采集的电路电流超过第二保护阈值或者第二采样电路采集的电压低于第三保护阈值，或者第三采样电路采集的电流超过第二保护阈值或者第三采样电路采集的电压低于第三保护阈值时，第二处理器确定电源系统的输出端发生了短路或者输出了浪涌电流。第二处理器触发第二硬件过流保护电路进行保护(OCP2保护)。具体地，通过第二硬件过流保护电路将封波信号传递到变压器原边侧后封锁变压器原边的驱动，并在间隔固定时间内进行再发波，若连续几次触发OCP2保护，该电源系统进行故障上报并关机锁死。
在如图1所示的方案中，变压器的原边电路和副边电路上都设置有过流硬件保护电路(第一过流硬件保护电路和第二过流硬件保护电路)，变压器的原边电路和副边电路的通信时延需要控制在1us以内。第一过流硬件保护电路和第二过流硬件保护电路用于执行不同的逻辑保护。因此，第一硬件过流保护电路的保护阈值设置的比第二硬件过流保护电路的保护阈值高，以保证在触发第二硬件过流保护电路的情况下不会触发第一硬件过流保护电路。但是针对上述方案，仍然具有如下缺点：
1.上述方案不适用于时延大的场景，在变压器原副边的通信延时比较大的场景下，对输出侧短路无法采用第二硬件过流保护电路。
如果第二硬件过流保护电路的保护阈值设置的相对较低，则在输出过载等情形下，很容易触发第二硬件过流保护电路，影响产品的性能。如果将第二硬件过流保护电路的保护阈值设置的相对较高。在输出短路的情形下，在第二过流保护电路被触发后，加上变压器原边和副边的通信时延，变压器原边晶体管进行封波时电流比较大，会有很高的应力，可能会造成晶体管应力失效而起不到故障保护的作用。
2.上述方案的硬件电路实现复杂，需要采用两个过流硬件保护电路以及两个硬件过流保护阈值来识别不同的故障。如果将第一过流保护电路的保护阈值和第二过流保护电路的保护阈值设置为同一个，则无法区分不同的故障。例如，在对输出侧的故障进行保护时，采用第一硬件过流保护电路的保护阈值进行封波保护，则电力变换装置无法区分故障是变压器原边或者副边绕组短路还是输出侧短路，进而无法针对该故障开启不同的保护措施。进一步地，如图2所示，当输出端频繁切载时容易误触发第一硬件过流保护，以及当出现绕组短路封波后，会在间隔td内继续发波，导致第一功率电路内的MOS管的应力超出规格，而存在风险。
图3为本发明申请实施例提供的一种电源系统的过流保护电路的结构示意图。如图3所示，包括：第一处理器、第一功率电路、第一采样电路、过流硬件保护电路(OCP)、变压器、第二功率电路、第二采样电路、第三采样电路、第二处理器。
第一功率电路的一端与电源系统的输入端连接，第一功率电路的另一端通过第一采样电路与变压器的一端连接。变压器的另一端与第二功率电路的一端相连。第二功率电路的另一端与电源系统的输出端相连。进一步地，第一采样电路还通过OCP电路与第一处理器相连。第二采样电路和第三采样电路分别与第二处理器、第二功率电路的输出端相连。第一处理器和第二处理器之间以高压隔离高速通讯的方式进行通讯。在一个可能的示例中，变压器为隔离变压器。第一处理器和第二处理器可以为主控芯片、控制单元、数字处理器、FPGA芯片、MCU与FPGA芯片的组合等处理器。在本申请实施例中，处理器接收到各个采样电路采集的电流值或者电压值以后，将接收的电流值和电压值与预先设定的阈值进行比较。用于比较的电流值或者电压值可以是采样电路采集的瞬时值，或者一段时间内采集的电流值/电压值的有效值，或者一端时间内采集的电流值/电压值的平均值。在本申请实施例，并不对此做限定。
第一采样电路实时采集变压器原边电路上的电流信号，并将采集的电流信号发送给OCP电路，OCP电路将接收的电流信号与预先设置的基准电流值(OCP电路的过流保护阈值)进行比较。当第一采样电路采集的电流值高于OCP电路的过流保护阈值时，OCP电路生成相应的OCP信号，并将该OCP信号发送给第一处理器。第一处理器确定该电源系统发生故障，触发OCP电路对电源系统进行封波，其中，对电源系统进行封波是指电源系统内的晶体管的驱动被中断，电源系统内部功率流传输路径被切断。然后，第一处理器继续对该电源系统的故障类型进行判断，并根据判断结果执行相应的保护逻辑。在本申请实施例中，第一采样电路采集的电流值超过OCP电路的保护阈值包括两种情况。第一种情况，变压器的原边电路或者副边电路出现了绕组短路/过流。第二种情况，电源系统的输出端电路出现了短路/过流。
针对第一种情况，第一处理器根据OCP信号触发电源系统进行封波以后，第一处理器继续接收信号。当第一处理器在第一时间阈值内接收到的第二处理器发送的第一信号确定输出端的电流值小于预设的电流值，或者输出端的电压值大于预设的电压值，第一处理确定当前电源系统发生的故障为变压器的原边或者副边发生了绕组短路/过流。第一处理器触发当前电源系统进行故障上报，并关机锁死。
针对第二种情况，以第二采样电路为电流采样电路，第三采样电路为电压采样电路为例进行说明。第一处理器根据OCP信号触发电源系统进行封波以后，第二处理器根据输出端采集的电流值和电压值输出第一信号。具体地，第二处理器将接收到的电流信号和电压信号与预先设定的电流阈值和电压阈值进行比较，并生成第一信息，第一信息用于指示电源系统的输出端是否发生了输出过流；。当第二采样电路获取的采样电流的电流值大于等于预设的电流阈值，且第三采样电路获取的采样电压的电压值小于等于预设的电压阈值时，第二处理器生成的第一信息，第一信息用于指示电源系统的输出端发生了输出过流。否者，第二处理器输出第一信息用于指示。然后第二处理器向第一处理器发送第一信号，该第一信号中携带有第二采样信号、第三采样信号和第一信息。或者，当第二处理器接收到输出端采集到的电流值和电压值以后，第二处理器直接向第一处理器发送第一信号，第一信号包括该电流值和电压值。
在一个可能的示例中，第一信息可以为标志位。标志位可以为0或1。当标志位为0时，表明电源系统的输出端没有发生输出过流。当标志位为1时，表明电源系统 的输出端发生了输出过流。
在一个可能的示例中，在对电源系统输出端的电信号进行采集时，可以在电源系统的输出端设置两个采样电路，用于同时采集电源系统输出端的电流值和电压值，并通过采集到的电流值和电压值来确定该电源系统的输出端是否发生了短路或者过流故障。也可以只在电源系统的输出端设置一个采样电路，用于采集电源系统输出端的电流或者电压，并根据采集到的电流值或者电压值来确定该电源系统的输出端是否发生的短路或者过流故障。需要说明的是，第二处理器在对接收到的采样信号进行判断时，可以通过相应的软件来对采集的电信号进行判断还可以依据第二处理器内部的电路对采集的电信号进行判断，产生一个保护信号。在本发明申请实施例中对第二处理器对采样信号的具体判断方式不作限定。
在一个可能的示例中，在对输出端的电流和电压进行采样时，可以先触发一个采样电路，再紧接着触发另一个采样电路，两个采样电路的触发时间间隔很短。
第一处理器接收第二处理器发送的第一信号，当接收的第一信号在第一时间阈值内时，第一处理器根据第一信号确定是否触发电源系统进入输出短路/过流保护逻辑。具体地，当第一处理器根据在第一时间阈值内接收的第一信号确定输出端的电流值大于等于预设的电流值且输出端的电压值小于等于预设的电压值时，触发该电源系统进入输出端短路/过流保护逻辑。否则第一处理器确定电源系统发生绕组短路故障，第一处理器触发电源系统关机并上报该故障。
进一步地，第一处理器根据第一时间阈值内接收的第一信号确定输出端的电流值是否大于等于预设的电流值且输出端的电压值是否小于等于预设的电压值时，有三种方式。
方式1，预先设置第二处理器对输出端的采样电路采集到的信号进行判断。第一处理器接收到第一信号以后，对第一信号中携带的第一信息进行判断。当第一信号中携带的第一信息指示电源系统的输出端发生了输出过流时，触发该电源系统进入输出端短路/过流保护逻辑。当第一信号中携带的第一信息指示电源系统的输出端没有发生输出过流时，第一处理器确定电源系统发生绕组短路故障，第一处理器触发电源系统关机并上报该故障。
方式2，预先设置第一处理器用于对输出端采集到的电信号进行判断。第一处理器接收到第一信号以后，对第一信号中携带的电流值和电压值进行判断。当第一信号中携带的电流值大于等于预设的电流值且第一信号中携带的电压值小于等于预设的电压值时，第一处理器触发该电源系统进入输出端短路/过流保护逻辑。否则，第一处理器确定电源系统发生绕组短路故障，第一处理器触发电源系统关机并上报该故障。在方式2中，可以选用低配置的第二处理器以节省成本，或者省略掉第二处理器选用通信电路来传递第二采样电路和第三采样电路采集的电流值和电压值。
方式3，预先不需要设置是由哪一个处理器对采集到的电信号进行判断。第一处理器在第一时间阈值内接收到第一信号后。第一处理器首先判断该第一信号中是否包括第一信息。当第一信号中携带有第一信息，且第一信息指示电源系统的输出端发生了输出过流时，第一处理器对电源系统的输出端进行过流保护；当第一信号中携带有第一信息，且第一信息指示电源系统的输出端没有发生输出过流时，第一处理器确定电源系统发 生绕组短路故障，触发电源系统关机并上报故障。当第一信号中没有携带第一信息时，第一处理器根据第一信号中携带的电流值和电压值进行判断。当第一信号中携带的电流值大于等于预设的电流值且第一信号中携带的电压值小于等于预设的电压值时，第一处理器触发该电源系统进入输出端短路/过流保护逻辑。否则，第一处理器确定电源系统发生绕组短路故障，第一处理器触发电源系统关机并上报该故障。
在一个可能的示例中，电源系统进入输出短路/过流保护逻辑以后，第一处理器触发电源系统以固定的时间间隔进行N次发波，N为大于等于1的整数。如果每次发波以后，第一处理器都能根据第一时间阈值内接收的第一信号确定输出端的电流值大于等于预设的电流值且输出端的电压值小于等于预设的电压值。则第一处理器确定电源系统的输出端出现输出短路或者过流故障，第一处理器触发电源系统进行故障上报，并关机锁死。如果在N次发波的过程中存在某一次发波以后，第一处理器根据接收到的第一信号确定输出端的电流值小于预设的电流值，或者输出端的电压值大于预设的电压值，第一处理器确定电源系统发生绕组短路故障，第一处理器触发电源系统关机并上报该故障。如果在N次发波的过程中存在某一次发波以后，第一处理器在第二时间阈值内没有接收到第一信号，第一处理器确定该电源系统发生通信故障，第一处理器触发该电源系统关机并上报该故障。
在一个可能的实施例中，在第一处理器根据OCP信号对电源系统进行封波以后，确定第一处理器在第二时间阈值内是否接收到第二处理器发送的第一信号。基于第一处理器在第二时间阈值内没有接收到第一信号，第一处理器确定第一处理器和第二处理器之间的通信中断。第一处理器触发当前电源系统进行故障上报，并关机锁死。其中，第二时间阈值可以根据需要预先进行设置。
需要说明的是，图3是该过流保护电路的一个示例图，并不用于对该电源系统的过流保护电路进行限定。在一个可能的示例中，在如图3所示的过流保护电路中，第一采样电路和OCP电路之间、第二采样电路和第二处理器之间、第三采样电路和第二处理器之间还可能有信号放电路、滤波电路等电路。在另一个可能的示例中，OCP电路可以设置在第一处理器所在的电路板上。或者将OCP电路可以设置在第一功率电路所在的电路板上。或者将OCP电路设置在第一处理器的内部。当OCP电路被设置在第一处理器的内部时，第一采样电路只需要将采样信号送入到第一处理器，由第一处理器内部的电路产生一个OCP信号。
进一步地，在本申请实施例中，对于电源系统内功率电路的个数以及变压器的个数不做限定，以及对电源系统内的多个功率电路和多个变压器的连接方式不做限定。在一个可能的示例中，以三个功率电路和两个变压器为例，三个功率电路和两个变压器的连接方式可以如图4a所示。在另一个可能的示例中，以六个功率电路和三个变压器为例，六个功率电路和三个变压器的连接方式可以如图4b所示。参照图4b，多个变压器原边(电源系统的输入端)上的多个功率电路串联连接，电源系统输出端的多个功率电路并联连接。
在本发明申请实施例中，先根据电源系统输入端采集的电流信号进行封波，然后在一定的时间间隔内，根据电源系统输出端采集到的电流信号和/或电压信号来确定电源系统后续继续发波还是关机，使得在变压器原边、副边通信时延较大的场景下，能 够有效的识别电源系统内的故障并进行保护。进一步地，在本申请实施例中，变压的原副边绕组短路故障以及电源系统的输出端短路/过流故障共用一个OCP保护点。即在本发明申请中只需要一个OCP硬件电路，就可以识别出电源系统发生故障时故障的类型并进行相应的保护，提升了电源系统的可靠性。
图5为图3所示的过流保护电路的一种具体实施例的电路结构示意图。如图5所示，第一采样电路包括电流互感器(Current Transformer，CT)、整流器、第一电阻R1，电流互感器从变压器的原边绕组电路获取电流。电流互感器的输出侧经整流电路以后，流经第一电阻R1。第一电阻R1上所分得的电压即为第一采样单元的采样信号。通过调节第一电阻R1的阻值，可以调节第一采样单元的采样信号幅值。
OCP电路包括比较器、至少一个电阻和至少一个电容。OCP电路中的比较器的反向输入端与第一采样电路的输出端连接，比较器的同向输入端输入OCP电路的比较基准电压值(OCP电路的过流保护阈值)，比较器的输出端与第一处理器相连。当第一采样电路输出的电流大于OCP电路的过流保护阈值时，比较器的输出端输出OCP信号到第一处理器。第一处理器接收到OCP信号以后，触发相应的保护逻辑。在本申请实施例中，第一处理器接收到OCP电路发送的OCP信号以后，第一处理器确定该电源系统发生故障，触发OCP电路对电源系统进行封波。
第二采样电路实时采集电源系统输出端的电流信号。第二采样电路包括第二电阻R2，第二电阻R2串联在第二功率电路回路中，通过调节第二电阻R2的阻值，可以调节第二采样单元输出的采样信号幅值。
第三采样电路实时采集电源系统输出端的电压信号，第三采样电路包括第三电阻R3和第四电阻R4。第三电阻R3和第四电阻R4通过串联分压，将第二功率电路输出的电压进行分压以实现采样信号的输出。
在一个可能的实施例中，第一采样电路在t1时刻采集到变压器原边的电流信号超过了OCP电路的过流保护阈值，OCP电路向第一处理器发送OCP信号，以使第一处理器对电源系统进行封波。第二采样电路和第三采样电路实时采集电源系统输出端的电信号，并将采集到的电流值和电压值发送给第二处理器。当第二采样电路采集到的电流值大于等于预先设置的电流阈值I th，且第三采样电路采集到的电压值小于等于预先设置的电压阈值Vth时，第二处理器向第一处理器发送第一信号，第一信号在t2时刻传递到第一处理器。其中，第一信号中携带有第一信息，第一信息指示电源系统的输出端发生了输出过流或者输出短路。如果第一处理器在间隔td时间内，接收到第一信号，且该第一信号中携带有第一信息，则第一处理器触发电源系统在一个固定的时间间隔内再发波。
在一个可能的示例中，第一处理器接收第一信号的时间间隔td＞t2-t1。
在本发明申请实施例中，当第一采样电路获取的电流值大于过流硬件保护电路的过流保护阈值时，第一处理器将OCP电路输出的过流保护信号作为第一个封波信号。然后，第二处理器根据第二采样信号和第三采样信号输出第一信号，并向第一处理器发送第一信号作为后续发波或者关机的判定条件。即在本发明申请实施例中只需要设置一个过流保护硬件电路就可以识别出电源系统发生故障时故障的类型并进行相应的保护， 提升了电源系统的可靠性。
图6为本发明申请实施例提供的一种电源系统的过流保护方法的流程图，该方法由图3或者图5所示的电路中的第一处理器执行。参照图6该方法包括：步骤S601-步骤S604。
步骤S601，接收OCP电路发送的过流保护信号，根据该过流保护信号触发电源系统进行封波。
第一采样电路实时获取变压器原边的电流信号，并将采集的电流信号发送给OCP电路。OCP电路将第一采样电路发送的电流信号与预设的OCP过流保护阈值进行比较，当第一采样电路采集的电流值大于预设的OCP过流保护阈值时，OCP电路向第一处理器发送过流保护信号(OCP信号)。第一处理器接收到过流保护信号以后，根据该过流保护信号触发电源系统进行封波。其中，对电源系统进行封波是指电源系统内的晶体管的驱动被中断，电源系统内部功率流传输路径被切断。
步骤S602，接收第二处理器发送的第一信号，当接收的第一信号在第一时间阈值内时，根据第一信号确定是否对电源系统的输出端进行过流保护。
在一个可能的示例中，预先设置第二处理器对输出端的采样电路采集到的信号进行判断。第一处理器接收到第一信号以后，对第一信号中携带的第一信息进行判断。当第一信号中携带的第一信息指示电源系统的输出端发生了输出过流或者输出短路时执行步骤S603。当第一信号中携带的第一信息指示电源系统的输出端没有发生输出过流或者输出短路时，执行步骤S604。
在一个可能的示例中，预先设置第一处理器用于对输出端采集到的电信号进行判断。第一处理器接收到第一信号以后，第一处理对第一信号中携带的电流值和电压值进行判断，当第一信号中携带的电流值大于等于第一阈值且第一信号中携带的电压值小于等于第三阈值时，执行步骤S603，否则执行步骤S604。
在一个可能的示例中，预先没有设置由哪一个处理器对输出端采集的电信号进行判断。第一处理器接收到第一信号以后，首先判断第一信号中是否携带有第一信息。当第一信号携带有第一信息，且第一信息指示电源系统的输出端发生了输出过流或者输出短路时，执行步骤S603。当第一信号中携带有第一信息，且该第一信息指示电源系统的输出端没有发生输出过流或者输出短路时，执行步骤S604。或者当第一信号中不包括第一信息时，第一处理器对第一信号中携带的电流值和电压值进行判断。当第一信号中携带的电流值大于等于第一阈值且第一信号中携带的电压值小于等于第三阈值时，执行步骤S603，否则执行步骤S604。
在一个可能的示例中，通过第二采样电路获取电源系统输出端的电流信号，以及通过第三采样电路获取电源系统的输出端的电压信号。然后第二采样电路将获取的电流信号、第三采样电路将获取的电压信号发送给第二处理器。第二处理器将接收到的电流信号和电压信号与预先设定的电流阈值和电压阈值进行比较，并生成第一信息，第一信息用于指示电源系统的输出端是否发生了输出过流或者输出短路。当第二采样电路获取的采样电流的电流值大于等于预设的电流阈值，且第三采样电路获取的采样电压的电压值小于等于预设的电压阈值时，第二处理器生成的第一信息指示电源系统的 输出端发生了输出过流或者输出短路。否则第二处理器生成的第一信息指示电源系统的输出端没有发生输出过流或者输出短路。然后第二处理器向第一处理器发送第一信号，该第一信号中携带有第二采样信号、第三采样信号和第一信息。
在另一个可能的示例中，第二采样电路将获取的电流信号、第三采样电路将获取的电压信号发送给第二处理器以后，第二处理器直接将第二采样电路获取的电流信号值和第三采样电路获取的电压信号值作为第一信号发送给第一处理器。
在一个可能的示例中，图6所示的电源系统的过流保护方案的时序图如图7所示。第一采样电路在t1时刻进行采样，第一处理器在t2时刻接收到第二处理发送的第一信号。此时，第一时间阈值td＞t2-t1。在一个可能的示例中，若第一处理器在t3时刻发现第一处理器和第二处理器之间的通信中断，第一处理器触发电源系统关机并上报故障。其中，t3＞t1。
步骤S603，第一处理器触发电源系统进入输出端短路/过流保护逻辑。
在一个可能的示例中，电源系统进入输出短路/过流保护逻辑以后，第一处理器触发电源系统以固定的时间间隔进行N次发波，N为大于等于1的整数。如果每次发波以后，第一处理器都能根据第一时间阈值内接收的第一信号确定输出端的电流值大于等于预设的电流值且输出端的电压值小于等于预设的电压值。则第一处理器确定电源系统的输出端出现输出短路或者过流故障，第一处理器触发电源系统进行故障上报，并关机锁死。如果在N次发波的过程中存在某一次发波以后，第一处理器根据接收到的第一信号确定输出端的电流值小于预设的电流值，或者输出端的电压值大于预设的电压值，第一处理器确定电源系统发生绕组短路故障，第一处理器触发电源系统关机并上报该故障。如果在N次发波的过程中存在某一次发波以后，第一处理器在第二时间阈值内没有接收到第一信号，第一处理器确定该电源系统发生通信故障，第一处理器触发该电源系统关机并上报该故障。
需要说明的是，上述示例中描述的输出端短路/过流保护的判断逻辑，只是本申请实施例中的一个具体的应用场景。出上述判断逻辑以外，还可以有其他的判断逻辑。比如，第一处理器触发电源系统等待一个固定的时间间隔以后再发波，连续发N次波以后，触发电源系统关机。在本发明申请实施例中对输出端短路/过流保护的判断逻辑的具体应用场景并不作限定。
步骤S604，确定所述电源系统发生绕组短路故障，触发电源系统关机并上报故障。
在本发明申请实施例中，先根据第一采样电路采集到的电信号进行封波。然后根据第二采样电路以及第三采样电路采集到的电信号确定当前电源系统发生故障的类型。进而根据不同的故障类型触发相应的保护逻辑。在本发明申请实施例中，变压的原副边绕组短路故障以及电源系统的输出端短路/过流故障共用一个OCP保护点。即在本发明申请中只需要一个OCP硬件电路，就可以识别出电源系统发生故障时故障的类型并进行相应的保护。
在本申请实施例中还提供了一种电力变换装置，该装置包括过流保护电路，该过流保护电路的具体结构参照上述实施例。进一步地，由于本申请实施例中的电力变换装置采用了上述过流保护电路的所有实施例的全部技术方案，因此至少具有上述过流保护电路实施例的技术方案所带来的所有有益效果，在此不再一一赘述。
本领域技术人员应该可以意识到，在上述一个或多个示例中，本发明所描述的功能可以用硬件、软件、固件或它们的任意组合来实现。当使用软件实现时，可以将这些功能存储在计算机可读介质中或者作为计算机可读介质上的一个或多个指令或代码进行传输。
以上所述的具体实施方式，对本发明的目的、技术方案和有益效果进行了进一步详细说明，所应理解的是，以上所述仅为本发明的具体实施方式而已，并不用于限定本发明的保护范围，凡在本发明的技术方案的基础之上，所做的任何修改、等同替换、改进等，均应包括在本发明的保护范围之内。

Claims (11)

  1. 一种电源系统的过流保护电路，其特征在于，所述保护电路包括：
    变压器，所述变压器的输入端通过第一功率电路与所述电源系统的输入端连接；所述变压器的输出端通过第二功率电路与所述电源系统的输出端连接；
    第一采样电路，用于对所述变压器输入端的电流信号进行采集，并输出第一采样信号；
    过流硬件保护电路，用于对所述第一采样信号的强度进行判断，当所述第一采样信号的强度大于第一阈值时，输出过流保护信号；
    第一处理器，用于根据所述过流保护信号触发所述电源系统进行封波；
    第二采样电路，用于对所述第二功率电路的输出端的电信号进行采集，并输出第二采样信号；
    第二处理器，用于输出第一信号；所述第一信号包括：第二采样信号；或者，用于对所述第二采样信号的强度进行判断，并输出第一信号，所述第一信号包括：第一信息和第二采样信号；所述第一信息用于指示所述电源系统的输出端是否发生了输出过流；
    其中，所述电源系统进行封波以后，所述第一处理器还用于接收第一信号，当接收的第一信号在第一时间阈值内时，第一处理器根据所述第一信号确定是否对所述电源系统的输出端进行过流保护。
  2. 根据权利要求1所述的电路，其特征在于，所述第二处理器用于：
    当所述第二采样信号为电流值且所述电流值大于等于第二阈值时产生第一信息，所述第一信息用于指示所述电源系统的输出端发生了输出过流，或者当所述第二采样信号为电压值且所述电压值小于等于第三阈值时产生第一信息，所述第一信息用于指示所述电源系统的输出端发生了输出过流；
    当所述第二采样信号为电流值且所述电流值小于第二阈值时产生第一信息，所述第一信息用于指示所述电源系统的输出端未发生输出过流，或者当所述第二采样信号为电压值且所述电压值大于第三阈值时产生第一信息，所述第一信息用于指示所述电源系统的输出端未发生输出过流。
  3. 根据权利要求1或2所述的电路，其特征在于，所述根据所述第一信号确定是否对所述电源系统的输出端进行过流保护，包括：
    根据所述第一信号中携带的第一信息，确定是否对所述电源系统的输出端进行过流保护；或者，
    根据所述第一信号中携带的第二采样信号的信号强度确定是否对所述电源系统的输出端进行过流保护。
  4. 根据权利要求3所述的电路，其特征在于，所述根据所述第一信号中携带的第一信息，确定是否对所述电源系统的输出端进行过流保护，包括：
    当所述第一信号中携带的第一信息指示所述电源系统的输出端发生输出过流时，所述第一处理器对所述电源系统的输出端进行过流保护；或者，
    当所述第一信号中携带的第一信息指示所述电源系统的输出端未发生输出过流时，所述第一处理器确定所述电源系统发生绕组短路故障，触发所述电源系统关机并上报故障。
  5. 根据权利要求3所述的电路，其特征在于，所述根据所述第一信号中携带的第二采样信号的信号强度确定是否对所述电源系统的输出端进行过流保护，包括：
    所述第一处理器对所述第二采样信号进行判断，当所述第二采样信号为电流值且所述电流值大于等于第二阈值，或者当所述第二采样信号为电压值且所述电压值小于等于第三阈值时第一处理器对所述电源系统的输出端进行过流保护；或者，
    当所述第二采样信号为电流值且所述电流值小于第二阈值，或者当所述第二采样信号为电压值且所述电压值大于第三阈值时确定所述电源系统发生绕组短路故障，触发所述电源系统关机并上报故障。
  6. 根据权利要求1或2所述的电路，其特征在于，根据所述第一信号确定是否对所述电源系统的输出端进行过流保护，包括：
    确定所述第一信号是否包括第一信息；
    基于所述第一信号中不包括第一信息，所述第一处理器根据所述第一信号中携带的第二采样信号的信号强度确定是否对电源系统的输出端进行过流保护；或者，
    基于所述第一信号中包括第一信息，且所述第一信息指示所述电源系统的输出端发生输出过流，所述第一处理器对所述电源系统的输出端进行过流保护；或者，
    基于所述第一信号中包括第一信息，且所述第一信息指示所述电源系统的输出端未发生输出过流，所述第一处理器确定所述电源系统发生绕组短路故障，触发所述电源系统关机并上报故障。
  7. 根据权利要求1所述的电路，其特征在于，所述第一处理器还用于：
    确定在第二时间阈值内是否接收到所述第一信号；
    基于所述第一处理器在第二时间阈值内没有接收到第一信号，确定所述电源系统发生通信故障，所述第一处理器触发所述电源系统关机并上报故障。
  8. 根据权利要求1所述的电路，其特征在于，所述电路还包括：第三采样电路；当所述第二采样电路为电流采样电路时，所述第三采样电路为电压采样电路；
    所述第三采样电路用于对所述第二功率电路的输出端的电压进行采集，并输出第三采样信号。
  9. 根据权利要求8所述的电路，其特征在于，所述第二处理器还用于：
    根据所述第二采样信号和所述第三采样信号输出第一信号，所述第一信号包括第二采样信号和第三采样信号；或者，
    对所述第二采样信号和所述第三采样信号的信号强度进行判断，并输出第一信号，所述第一信号包括：第一信息、第二采样信号和第三采样信号；所述第一信息用于指示所述电源系统的输出端是否发生了输出过流；当所述第二采样电路采集的电流值大于等于第二阈值，且所述第三采样电路采集的电压值小于等于第三阈值时，产生第一信息，所述第一信息用于指示所述电源系统的输出端发生了输出过流；当所述第二采样电路采集的电流值小于第二阈值时，产生第一信息，所述第一信息用于指示所述电源系统的输出端未发生输出过流；或者，当所述第三采样电路采集的电压值大于第三阈值时，产生第一信息，所述第一信息用于指示所述电源系统的输出端未发生输出过流。
  10. 根据权利要求1所述的电路，其特征在于，所述变压器为隔离变压器。
  11. 一种电力变换装置，其特征在于，所述电力变换装置包括电源和过流保护电路，所述过流保护电路为如权利要求1-10中任一项所述的保护电路；所述电源用于为所述过流保护电路供电。
PCT/CN2022/143367 2022-05-16 2022-12-29 一种电源系统的过流保护电路及装置 WO2023221526A1 (zh)

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CN103683204A (zh) * 2012-09-26 2014-03-26 深圳市海洋王照明工程有限公司 开关电源过流保护电路
CN204424878U (zh) * 2015-03-04 2015-06-24 深圳市汇川技术股份有限公司 多路输出辅助电源的变压器绕组短路保护电路
CN104767260A (zh) * 2015-03-30 2015-07-08 华为技术有限公司 充电器、终端设备和充电系统
JP2017224924A (ja) * 2016-06-14 2017-12-21 ローム株式会社 スイッチング制御装置
CN111697809A (zh) * 2020-07-20 2020-09-22 阳光电源股份有限公司 一种开关电源及其控制方法
CN112542941A (zh) * 2020-11-27 2021-03-23 重庆长安新能源汽车科技有限公司 一种电机控制器及其电流调节方法

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CN103683204A (zh) * 2012-09-26 2014-03-26 深圳市海洋王照明工程有限公司 开关电源过流保护电路
CN204424878U (zh) * 2015-03-04 2015-06-24 深圳市汇川技术股份有限公司 多路输出辅助电源的变压器绕组短路保护电路
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