WO2019061139A1 - Procédé et appareil de protection contre les court-circuits - Google Patents

Procédé et appareil de protection contre les court-circuits Download PDF

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Publication number
WO2019061139A1
WO2019061139A1 PCT/CN2017/103928 CN2017103928W WO2019061139A1 WO 2019061139 A1 WO2019061139 A1 WO 2019061139A1 CN 2017103928 W CN2017103928 W CN 2017103928W WO 2019061139 A1 WO2019061139 A1 WO 2019061139A1
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WO
WIPO (PCT)
Prior art keywords
current
circuit
module
operating
load
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PCT/CN2017/103928
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English (en)
Chinese (zh)
Inventor
徐家林
Original Assignee
深圳传音通讯有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Priority to PCT/CN2017/103928 priority Critical patent/WO2019061139A1/fr
Publication of WO2019061139A1 publication Critical patent/WO2019061139A1/fr

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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
    • H02H7/08—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 dynamo-electric motors
    • H02H7/085—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 dynamo-electric motors against excessive load

Definitions

  • the present invention relates to the field of electronic circuits, and in particular, to a method and apparatus for circuit short circuit protection.
  • IGBTs Insulated Gate Bipolar Transistors
  • the characteristics of small power and bipolar transistor voltage, large current capacity and reduced tube voltage are the most commonly used power electronic switching devices for medium and large power switching power supplies.
  • the current that the IGBT can withstand depends on its saturation voltage drop and the amount of short-circuit current. If the current is too large, the system will be seriously damaged.
  • the technical problem to be solved by the embodiment of the present invention is to determine whether the circuit is short-circuited when the circuit is turned on, and to determine whether the current is greater than or equal to the preset current-limiting current when the circuit is turned on, thereby realizing the current when the circuit is turned on.
  • the circuit is turned off when the preset current limiting current is greater than or equal to the purpose of protecting the power supply and the electrical equipment in the circuit.
  • the present invention provides a circuit short circuit protection method, the method comprising:
  • the power source is normally powered according to the working voltage and the working current, and the value of the preset current limiting current is Replaced with the value of the operating current, if not, the circuit is turned off.
  • a second current of the circuit is detected, and if the second current is greater than the operating current, the circuit is turned off.
  • the preset current limiting current is 2 milliamps.
  • the operating voltage and the operating current are determined according to a rated voltage and a rated current of the circuit load.
  • the method further comprises: setting a temperature threshold of the circuit, and when the temperature of the circuit is detected to reach the threshold, disconnecting the circuit.
  • an embodiment of the present invention provides a circuit short circuit protection device, where the device includes:
  • a power module a setting module, a detecting module, a control module, and a load module;
  • the power module is used to provide electrical energy to the circuit
  • the setting module is configured to set an operating voltage, an operating current, and a current limiting current of the power module;
  • the detecting module is configured to detect a size of the first current and the second current in the circuit
  • the control module is configured to: when the first current detected by the detecting module at a moment when the circuit is turned on is greater than or equal to a preset current limiting current, disconnect the circuit, and the detecting module is connected in the circuit When the first current detected instantaneously is less than the preset current limiting current, controlling the circuit to work normally and replacing the value of the preset current limiting current with the value of the working current;
  • the load module is configured to be electrically connected to the power module to form a complete power supply circuit.
  • the setting module sets an operating voltage and an operating current of the current module according to a rated voltage and a rated current of the load.
  • the detecting module is further configured to detect a value of a value of the second current of the circuit after the circuit works normally.
  • control unit is further configured to: when the detecting module detects that the second current of the circuit is not less than the operating current after the circuit is working normally, disconnect the circuit.
  • the prime device further includes a thermal protection module in series with the load module for disconnecting the circuit when the temperature exceeds a set value.
  • the circuit determines whether the circuit has a short circuit fault by detecting whether the first current in the circuit is greater than or equal to the preset current limit current at the moment of turning on, if the circuit is connected If it is detected that the first current is greater than or equal to the preset current limiting current, the circuit is considered to be short-circuited, and the circuit is turned off to protect various devices in the circuit, if the circuit is in an instant If the first current is less than the current limiting current, it is considered that the circuit does not have a short circuit, the circuit is normally powered to make it work normally, and the value of the preset current limiting current is replaced by the working power The value of the stream continues to detect the second current of the circuit. If greater than the operating current, the circuit is opened and the circuit is further protected.
  • FIG. 1 is a schematic flow chart of a circuit short circuit protection method according to an embodiment of the present invention.
  • FIG. 2 is a schematic flow chart of another circuit short circuit protection method according to an embodiment of the present invention.
  • FIG. 2A is a schematic circuit diagram of a circuit short circuit protection method according to an embodiment of the present invention.
  • FIG. 3 is a schematic structural diagram of a circuit short circuit protection device according to an embodiment of the present invention.
  • the rated voltage refers to a standard voltage for long-term stable operation of electrical equipment (including electrical equipment and power supply equipment), and the rated voltage can be understood from two aspects of the electric equipment and the power supply equipment, and the rated value of the electric equipment
  • the voltage represents the optimum input voltage that the device is designed from the factory, and is usually the power supply voltage that is relatively easy to obtain.
  • the rated voltage of the power supply equipment represents the optimal output voltage of the power supply system and needs to be matched with the rated voltage of the power equipment, including the rated voltage of the power grid, the rated voltage of the engine, and the rated voltage of the power transformer.
  • the rated current refers to the current when the electrical equipment is operated at the rated voltage according to the rated power, and the current should not exceed the rated current when the electrical appliance is in operation.
  • the rated power refers to the power when the electrical appliance is working normally, and its value is the rated voltage of the electrical appliance multiplied by the rated current. If the actual power of the appliance is greater than the rated power, the appliance may be damaged. If the actual power of the appliance is less than the rated power, the appliance may not work properly.
  • the embodiment of the invention discloses a circuit short circuit protection method, which can detect whether the current in the circuit exceeds the preset current limiting current and then the control circuit is turned on and off to protect the device in the circuit from damage when the circuit is turned on.
  • FIG. 1 is a schematic flowchart of a short circuit protection method according to an embodiment of the present invention. As shown in FIG. 1, the circuit short circuit protection method includes:
  • the circuit includes at least a power source, a load, and a connecting lead.
  • the power source is indispensable for outputting electrical energy in the circuit, and is a device for converting other forms of energy into electrical energy.
  • the load refers to an electronic component that is connected across the power supply in the circuit and is a device that converts electrical energy into other forms of energy.
  • the connecting wire electrically connects a power source, a load, and other accessory devices for transmitting electricity The medium of energy.
  • the accessory devices include, but are not limited to, various types of control devices, protection devices, measurement devices, and the like.
  • the power source may be a DC power source or an AC power source.
  • the DC power source refers to two electrodes having positive and negative electrodes. When the two electrodes are connected to the circuit, a constant potential difference can be maintained between the two ends of the circuit, thereby forming a current from the positive electrode to the negative electrode in the external circuit.
  • AC power refers to the power supply whose current magnitude and direction change regularly with time, such as the domestic 220V mains.
  • the source of the power of the DC power source or the AC power source includes, but is not limited to, chemical energy, solar energy, wind energy, water energy, nuclear energy, and the like, which are not specifically limited in the embodiment of the present invention.
  • the load may be an inductive load, may be a capacitive load, or may be a resistive load according to different load effects exhibited by the powered device, or may be combined into two or two or three of the above three loads.
  • Load refers to a load whose load current lags the load voltage by one phase, such as a transformer, an electric motor, or the like.
  • the capacitive load refers to a load whose load voltage lags the load current by one phase.
  • a resistive load is a resistor that has no phase difference between the load current and the load voltage compared to the power source, such as an incandescent lamp or a resistor in an electric water heater. It is to be understood that the number of the load in the circuit may be one or more, which is not specifically limited in the embodiment of the present invention. It should be understood that the above examples are by way of example only and are not to be construed as limiting.
  • the operating voltage and the operating current of the circuit are set according to the load of the circuit, and the circuit sets the output voltage and output current of the power supply according to the rated voltage and rated current indicated on the nameplate of the load device.
  • the working voltage and the working current of the circuit may be set by using physical buttons or knobs on the power source, or the power source may provide a user interaction interface, and the user may click on the screen or voice.
  • the input may also be a model in which the user directly inputs the load device, and the power source automatically sets its output voltage and output current according to the model of the load device.
  • the load can also adjust the rated voltage and the rated current of the working voltage according to the output voltage and the output current of the power supply, which are not specifically limited in the embodiment of the present invention.
  • the circuit Detect whether the first current of the circuit at the moment of turning on is less than a preset current limit current. If yes, the circuit normally supplies power according to the working voltage and the working current, and the preset current limiting current is The value is replaced by the value of the operating current, and if not, the circuit is turned off.
  • the leakage current is greater than 1 mA and can be regarded as a short circuit, such as power supply filtering.
  • the leakage current of the device refers to the current from the filter case to any end of the AC input line under the rated AC voltage. Since the leakage current of the power supply filter involves personal safety, international countries have strict standards for this, for 220V/ A 50 Hz AC grid generally requires a leakage current of less than 1 mA.
  • the device for detecting the current in the circuit must reach the milliamp level, which may be a milliampere meter or a microampere meter, which may be an electromagnetic milliampere meter/microampere meter or a magnetoelectric milliampere meter/microampere
  • the table according to whether the power source in the circuit is a DC power source or an AC power source, selects a DC current meter or an AC current meter, or an AC/DC current meter.
  • the embodiment of the invention is not specifically limited.
  • the leakage current includes, but is not limited to, a power supply leakage current, a semiconductor element leakage current, a capacitance leakage current, and a filter leakage current.
  • a power supply leakage current in order to reduce interference, an EMI filter circuit is generally provided, so that the switching power supply has a small current to the ground after the power is connected, that is, the power supply leakage current, and the capacitive medium cannot be absolutely non-conductive.
  • the capacitor is added with a DC voltage, the capacitor will have a leakage current. If the leakage current is large, the capacitor will be damaged by heat.
  • the preset current limiting current is the maximum current allowed by the circuit at the initial moment of conduction, that is, the circuit detects that the leakage current is greater than or equal to the preset current limiting current.
  • the circuit detects that the leakage current is greater than or equal to the preset current limiting current.
  • the circuit does not detect a current greater than or equal to the preset current limiting current at the initial moment of conduction, it is considered that the circuit does not have a short circuit and can work normally, and the circuit is switched to a normal power supply at this time. a state, resetting the value of the preset current limiting current to a value of the operating current to make the circuit work normally.
  • the circuit determines whether the circuit has a short-circuit fault by detecting whether the current in the circuit is greater than or equal to the preset current-limiting current at the moment of turning on, if the current is greater than Or equal to the preset current limiting current, the circuit is considered to be short-circuited, the circuit is turned off to protect various devices in the circuit, and if the current is less than the current limiting current, the circuit is considered not to occur. Short circuit, the circuit is normally powered to make it work properly.
  • FIG. 2 is a schematic flowchart diagram of another short circuit protection method according to an embodiment of the present invention. As shown in FIG. 2, the short circuit protection method includes the following steps:
  • the operating voltage and the operating current of the circuit are set according to the load of the circuit, and the circuit is set according to the rated voltage and rated current indicated on the nameplate of the load device.
  • the output voltage and output current of the power supply ensure the normal operation of the load device. For example, if the load is a white paper lamp, marked "12V, 40W" on it, it indicates that its operating voltage is 12V and the operating current is 3.33A.
  • the operating voltage may also be a range value, for example The operating voltage of the STC89C52 is 3.3V to 5.5V, so it can be set to operate at 5.5V.
  • the working voltage and the working current of the circuit may be set by using physical buttons or knobs on the power source, or the power source may provide a user interaction interface, and the user may click on the screen or voice.
  • the input may also be a model in which the user directly inputs the load device, and the power source automatically sets its output voltage and output current according to the model of the load device. It can be understood that the load can also adjust the rated voltage and the rated current of the working voltage according to the output voltage and the output current of the power supply, which are not specifically limited in the embodiment of the present invention.
  • the circuit includes at least a power source, a load, and a connecting lead.
  • the power source is a device for outputting electric energy in the circuit, and is a device for converting other forms of energy into electric energy.
  • the load refers to an electronic component that is connected across the power supply in the circuit and is a device that converts electrical energy into other forms of energy.
  • the connecting wire is a medium that electrically connects a power source, a load, and other accessory devices for transmitting electrical energy.
  • the accessory devices include, but are not limited to, various types of control devices, protection devices, measurement devices, and the like.
  • the power source may be a DC power source or an AC power source.
  • the DC power source refers to two electrodes having positive and negative electrodes. When the two electrodes are connected to the circuit, a constant potential difference can be maintained between the two ends of the circuit, thereby forming a current from the positive electrode to the negative electrode in the external circuit.
  • AC power refers to the power supply whose current magnitude and direction change regularly with time, such as the domestic 220V mains.
  • the source of the power of the DC power source or the AC power source includes, but is not limited to, chemical energy, solar energy, wind energy, water energy, nuclear energy, and the like, which are not specifically limited in the embodiment of the present invention.
  • the load may be an inductive load, may be a capacitive load, or may be a resistive load according to different load effects exhibited by the powered device, or may be combined into two or two or three of the above three loads.
  • Load refers to a load whose load current lags the load voltage by one phase, such as a transformer, an electric motor, or the like.
  • the capacitive load refers to a load whose load voltage lags the load current by one phase.
  • a resistive load is a resistor that has no phase difference between the load current and the load voltage compared to the power source, such as an incandescent lamp or a resistor in an electric water heater. It is to be understood that the number of the load in the circuit may be one or more, which is not specifically limited in the embodiment of the present invention. It should be understood that the above examples are by way of example only and are not to be construed as limiting.
  • the circuit Detect whether the first current of the circuit at the moment of being turned on is less than a preset current limit current. If yes, the circuit normally supplies power according to the working voltage and the working current, and the preset current limiting current is The value is replaced by the value of the operating current, and if not, the circuit is turned off.
  • the preset current limiting current is the maximum current allowed to pass by the circuit at the initial moment of conduction, and the preset current limiting current can be set according to the power source or the load, in the embodiment of the present invention.
  • the preset current limiting current is set to 2 mA. That is, when the first current is greater than or equal to the preset current limiting current when the circuit is turned on, the circuit may be regarded as a short circuit accident, and when a short circuit accident occurs, the circuit is disconnected. In order to protect the equipment in the circuit and remind the user that the circuit is short-circuited, it is necessary to eliminate the fault.
  • the circuit does not detect a first current greater than or equal to the preset current limiting current at the initial moment of conduction, then the circuit is considered to have no short circuit and can work normally, according to the operating voltage and the The operating current is normally supplied, and the value of the preset current limiting current is replaced with the value of the operating current to cause the circuit to operate normally.
  • FIG. 2A is a simple simple circuit for controlling an LED with a 89C51 single-chip microcomputer.
  • the operating voltage VCC is set to +5 volts, and the operating current is 15 mA.
  • the preset current limiting current is 2 milliamps.
  • the detecting circuit detects a first current output by the power source.
  • the The detecting circuit sends a first disconnection command to the control circuit, instructing the control circuit to open the circuit, if the first current detected by the detecting circuit at the moment of circuit turning is less than 2 milliamps,
  • the circuit is normally powered according to the set operating voltage and operating current, and the value of the preset current limiting current is replaced by 15 mA, and the detecting circuit continues to detect the second current of the circuit, and if the When the two currents are greater than 15 mA, the circuit is turned off. If the second current is less than 15 mA, the LED of the circuit is turned on or off under the control of the relevant control program.
  • the leakage current is greater than 1 mA, which can be regarded as a short circuit.
  • the leakage current of the power supply filter refers to the current of the filter housing to any end of the AC input line under the rated AC voltage, due to the leakage current of the power supply filter.
  • the size involves personal safety. International countries have strict standards for this. For 220V/50Hz AC grids, the leakage current of the power filter is generally less than 1 mA.
  • the device for detecting the current in the circuit must reach the milliamp level, which may be a milliampere meter or a microampere meter, which may be an electromagnetic milliampere meter/microampere meter or a magnetoelectric milliampere meter/microampere Table, according to whether the power source in the circuit is a DC power source or an AC power source, select to use a DC current meter or an AC current meter, or DC dual-purpose ammeter.
  • the embodiment of the invention is not specifically limited.
  • the leakage current includes, but is not limited to, a power supply leakage current, a semiconductor element leakage current, a capacitance leakage current, and a filter leakage current.
  • a power supply leakage current in order to reduce interference, an EMI filter circuit is generally provided, so that the switching power supply has a small current to the ground after the power is connected, that is, the power supply leakage current, and the capacitive medium cannot be absolutely non-conductive.
  • the capacitor is added with a DC voltage, the capacitor will have a leakage current. If the leakage current is large, the capacitor will be damaged by heat.
  • the circuit determines whether the circuit has a short-circuit fault by detecting whether the current in the circuit is greater than or equal to the preset current-limiting current in an initial stage of being turned on. If the current is greater than or equal to the predetermined current limiting current, the circuit is considered to be short-circuited, the circuit is turned off to protect various devices in the circuit, and if the current is less than the current limiting current, the circuit is considered No short circuit has occurred and the circuit is normally powered to operate properly.
  • circuit short circuit protection method may further include the following steps:
  • the overheat protection refers to a series thermal protection switch on the circuit.
  • the thermal protection switch is a thermostat with a bimetal as a temperature sensing component.
  • the bimetal When the electrical appliance is working normally, the bimetal is in a free state and the contacts are closed. / Disconnected state, when the temperature reaches the operating temperature, the bimetal is heated to generate an internal stress 2, and the contact is opened/closed to cut/close the circuit, thereby controlling the temperature.
  • the normally closed type thermal protection switch is selected.
  • the circuit does not have a short circuit fault, the circuit works normally, and the thermal protection switch is always in a closed state, if the circuit has a short circuit fault or If the circuit is overheated due to other reasons and the temperature threshold is reached, the bimetal of the thermal protection switch is quickly disconnected due to internal stress caused by heat, and the circuit is cut off.
  • the device in the circuit may also have a short circuit fault. Therefore, the power supply is normally powered according to the working voltage and the working current, and the preset is After the value of the current limiting current is replaced by the operating current, the second current in the circuit is continuously detected, and when the second current is greater than the operating current, the circuit is turned off to protect the circuit device.
  • the circuit determines whether the circuit has a short circuit fault by detecting whether the first current in the circuit is greater than or equal to the preset current limiting current at an initial moment of being turned on. If the first current is greater than or equal to the preset current limiting current when the circuit is turned on, the circuit is considered to be short-circuited, and the circuit is turned off to protect various devices in the circuit, if When the first current is less than the current limiting current when the circuit is turned on, it is considered that the circuit does not have a short circuit, the circuit is normally powered to make it work normally, and the value of the preset current limiting current is After the value of the operating current is replaced, the second current of the circuit is continuously detected. If the working current is greater than the operating current, the circuit is disconnected, and the circuit is further protected.
  • FIG. 3 is a schematic structural diagram of a circuit short circuit protection device according to an embodiment of the present invention.
  • the circuit short circuit protection device in the embodiment of the present invention includes: a power module 301, and a setting Module 302, detection module 303, control module 304, thermal protection module 305, and load module 306.
  • the power module 301 is configured to provide power to the circuit.
  • the power module may be a DC power source or an AC power source.
  • the setting module 302 is configured to set an operating voltage, an operating current, and a current limiting current of the power module. Specifically, the setting module 302 is configured to set an operating voltage and an operating current of the power module according to a rated power and a rated load of the load of the circuit, and set a current limiting current in an initial stage of the circuit.
  • the setting module 302 may be configured to set the working voltage, the working current, and the current limiting current through a physical button or a knob, or may be input through a voice or a touch screen by providing a user interface, when setting the voltage and current,
  • the functional operating voltage, the operating current, and the value of the current limiting current may be directly input, or may be a model of the input of the load, and the setting module 302 automatically sets according to the pre-stored load data.
  • the detecting module 303 is configured to detect a first current and a second current in the circuit, specifically, to detect a first current in the circuit when the circuit is turned on, if the first current And being greater than or equal to the preset current limiting current, sending a first disconnection command to the control module 304, wherein the detecting module 303 is further configured to detect a second current in the circuit when the circuit is working normally And sending a second disconnection command to the control module 304 when the second current is greater than the operating current.
  • the control module 304 is configured to control to disconnect the circuit or control the normal power supply operation of the circuit. Specifically, the detecting module 303 detects the first power at the moment when the circuit is turned on. When the current is greater than or equal to the preset current limiting current, the circuit is turned off, and when the first current detected at the moment when the circuit is turned on is less than the preset current limiting current, the circuit is controlled to work normally. And replacing the value of the preset current limiting current set by the setting module 302 with the value of the working current, the control module 304 is further configured to: after the circuit works normally, if the detecting module 303 detects the When the second current is greater than the operating current, the circuit is turned off.
  • the thermal protection module 305 is configured to disconnect the circuit when the circuit temperature is too high.
  • the thermal protection module is a normally closed thermal protection switch, and the thermal protection switch turns off the circuit when the temperature in the circuit exceeds a preset temperature threshold.
  • the load module 306 is configured to be electrically connected to the power module to form a complete power supply circuit.
  • the load module may be an inductive load, a capacitive load or a resistive load, or may be a load formed by combining two or two or a combination of the three.

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  • Emergency Protection Circuit Devices (AREA)

Abstract

La présente invention concerne un procédé et un appareil de protection contre les court-circuits. Le procédé comprend les étapes consistant à : définir une tension de travail et un courant de travail d'une alimentation électrique, le courant de travail étant le courant de travail maximal autorisé, sous la tension de travail, par un circuit ; et détecter si un premier courant du circuit est inférieur à un courant de limitation prédéfini. Si tel est le cas, le circuit fonctionne normalement en fonction de la tension de travail et du courant de travail et la valeur du courant de limitation prédéfini est remplacée par la valeur du courant de travail. Dans le cas contraire, le circuit est déconnecté. Au moyen de la mise en œuvre d'un procédé permettant de détecter si le courant dans un circuit est supérieur ou égal à un courant de limitation prédéfini lorsque le circuit est connecté, la solution technique de la présente invention peut déconnecter le circuit d'une manière opportune lorsque le courant dans le circuit est supérieur ou égal à un courant prédéfini, de façon à protéger un dispositif dans le circuit.
PCT/CN2017/103928 2017-09-28 2017-09-28 Procédé et appareil de protection contre les court-circuits WO2019061139A1 (fr)

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Application Number Priority Date Filing Date Title
PCT/CN2017/103928 WO2019061139A1 (fr) 2017-09-28 2017-09-28 Procédé et appareil de protection contre les court-circuits

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2017/103928 WO2019061139A1 (fr) 2017-09-28 2017-09-28 Procédé et appareil de protection contre les court-circuits

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WO2019061139A1 true WO2019061139A1 (fr) 2019-04-04

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102185168A (zh) * 2011-03-30 2011-09-14 惠州Tcl移动通信有限公司 充电系统及其充电方法
CN102611079A (zh) * 2012-03-13 2012-07-25 华为技术有限公司 隔离式功率转换器的短路保护系统及方法
US8373394B1 (en) * 2008-05-30 2013-02-12 Ecoearthenergy, Inc. System and method for power factor correction
CN105703333A (zh) * 2016-03-16 2016-06-22 广州视源电子科技股份有限公司 压缩机的电流保护方法和系统

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8373394B1 (en) * 2008-05-30 2013-02-12 Ecoearthenergy, Inc. System and method for power factor correction
CN102185168A (zh) * 2011-03-30 2011-09-14 惠州Tcl移动通信有限公司 充电系统及其充电方法
CN102611079A (zh) * 2012-03-13 2012-07-25 华为技术有限公司 隔离式功率转换器的短路保护系统及方法
CN105703333A (zh) * 2016-03-16 2016-06-22 广州视源电子科技股份有限公司 压缩机的电流保护方法和系统

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