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EP-4266519-B1 - PE LINE PROTECTION SYSTEM FOR POWER UTILIZATION AND CHARGING APPARATUS, AND POWER UTILIZATION AND CHARGING APPARATUS

EP4266519B1EP 4266519 B1EP4266519 B1EP 4266519B1EP-4266519-B1

Inventors

  • WANG, CHAO

Dates

Publication Date
20260506
Application Date
20211213

Claims (9)

  1. A PE line protection system for a power utilization and charging apparatus, comprising a driving circuit (1), a switch (2) and a detection circuit, an input end of the driving circuit (1) is connected to an output end of the power utilization and charging apparatus, a driving end of the driving circuit (1) is connected to a control end of the switch (2), a first end of the switch (2) is connected to an output end of the PE line, and a second end of the switch (2) is connected to an input end of the PE line; the driving circuit (1) is used for controlling the switch (2) to cut off the PE line upon reception of a signal for indicating the abnormal connection of the PE line that is transmitted by the power utilization and charging apparatus; characterized in that an input end of the detection circuit is connected to a control end of the power utilization and charging apparatus, and a detection end of the detection circuit is connected to the output end of the PE line; the detection circuit is used for starting detection of an on-off state of the switch (2) upon reception of a detection start signal transmitted by the power utilization and charging apparatus, and outputting a first detection value if it is detected that the switch (2) is turned on; and outputting a second detection value if it is detected that the switch (2) is turned off; the detection circuit comprises a third resistor (R3), a fourth resistor (R4), a third switch tube (Q3) and a second diode (D2), wherein, a control end of the third switch tube (Q3) is connected to the control end of the power utilization and charging apparatus, a first end of the third switch tube (Q3) is connected to a first end of the third resistor (R3), a second end of the third resistor (R3) is connected to a first end of the fourth resistor (R4) and to a common end which serves as an output end of the detection circuit, a second end of the fourth resistor (R4) is connected to a cathode of the second diode (D2), an anode of the second diode (D2) is connected to a power supply, and a second end of the third switch tube (Q3) is connected to the output end of the PE line; the detection circuit is used specifically for turning on the third switch tube (Q3) upon reception of the detection start signal transmitted by the power utilization and charging apparatus, to start detection of an on-off state of the switch (2), and outputting a first detection value if it is detected that the switch (2) is turned on; and outputting a second detection value if it is detected that the switch (2) is turned off.
  2. The PE line protection system for a power utilization and charging apparatus according to claim 1, characterized in that , the driving circuit (1) comprises a controllable switch module and a freewheeling circuit, wherein, a control end of the controllable switch module is connected to the output end of the power utilization and charging apparatus, a first end of the controllable switch module is connected to a first control end of the switch (2) and an input end of the freewheeling circuit respectively, a second end of the controllable switch module is grounded, an output end of the freewheeling circuit is connected to a second control end of the switch (2), and a common end is connected to a power supply; the driving circuit (1) is used specifically for controlling the controllable switch module to be turned off such that the switch (2) cuts off the PE line upon reception of a signal for indicating the abnormal connection of the PE line that is transmitted by the power utilization and charging apparatus.
  3. The PE line protection system for a power utilization and charging apparatus according to claim 2, characterized in that , the controllable switch module comprises a first resistor (R1) and a first switch tube (Q1), wherein, a first end of the first resistor (R1) is connected to the output end of the power utilization and charging apparatus, a second end of the first resistor (R1) is connected to a control end of the first switch tube (Q1), a first end of the first switch tube (Q1) is connected to the first control end of the switch (2) and the input end of the freewheeling circuit respectively, and a second end of the first switch tube (Q1) is grounded.
  4. The PE line protection system for a power utilization and charging apparatus according to claim 3, characterized in that , the controllable switch module further comprises a second resistor (R2) and a second switch tube (Q2), wherein, a first end of the second resistor (R2) is connected to the first end of the first switch tube (Q1) and a control end of the second switch tube (Q2) respectively, a second end of the second resistor (R2) is connected to the power supply, a first end of the second switch tube (Q2) is connected to the first control end of the switch (2) and the input end of the freewheeling circuit respectively, and a second end of the second switch tube (Q2) is grounded.
  5. The PE line protection system for a power utilization and charging apparatus according to claim 4, characterized in that , the first switch tube (Q1) and the second switch tube (Q2) are both a triode, wherein, a base electrode of the triode serves as a control end of the first switch tube (Q1)and the second switch tube (Q2), a collector electrode of the triode serves as a first end of the first switch tube (Q1) and the second switch tube (Q2), and an emitter electrode of the triode serves as a second end of the first switch tube (Q1)and the second switch tube (Q2).
  6. The PE line protection system for a power utilization and charging apparatus according to claim 2, characterized in that , the freewheeling circuit is a first diode (D1), wherein, an anode of the first diode (D1) serves as the input end of the freewheeling circuit, and a cathode of the first diode (D1) serves as the output end of the freewheeling circuit.
  7. The PE line protection system for a power utilization and charging apparatus according to claim 1, characterized in that , the switch (2) is one of a relay, a mos tube, a thyristor, a triode, or a combination thereof.
  8. The PE line protection system for a power utilization and charging apparatus according to claim 1, characterized in that , the third switch tube (Q3) is a triode, wherein, the base electrode of the triode serves as the control end of the third switch tube (Q3), the collector electrode of the triode serves as the first end of the third switch tube (Q3), and the emitter electrode of the triode serves as the second end of the third switch tube (Q3).
  9. A power utilization and charging apparatus, characterized in comprising a PE line protection system for a power utilization and charging apparatus according to any one of claims 1 to 8.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This application claims priority to Chinese Utility Model Patent Application No. 202023059783.0, entitled "PE line protection system for power utilization and charging apparatus, and power utilization and charging apparatus", and filed on December 17, 2020. TECHNICAL FIELD The present application relates to the field of PE line protection for a power utilization and charging apparatus, and in particular to a PE line protection system for power utilization and charging apparatus, and a power utilization and charging apparatus. BACKGOUND With the advent of 5G era, mobile power utilization and charging apparatus are increasingly used in modern society. The safety of power utilization and charging has become a common concern of the society. A power utilization and charging apparatus shall be grounded. However, when a wrong current flows into a PE (Protecting Earthing) line, for example, a live line or a live conductor is mistakenly connected to the PE line, the existing power utilization and charging apparatus cannot make a timely and effective treatment, and a metal part of the charging apparatus may be electrified, causing electric shock hazard to a human body and even life-threatening. Therefore, it is a problem currently to be solved by those skilled in the art to provide a solution to the above technical problems. CN 110 435 457 A discloses a portable electric vehicle charger. The portable electric vehicle charger comprises a control box, the control box internally comprises an openable protection grounding circuit, and the openable protection grounding circuit comprises a relay control module and an injection current control module. The relay control module is used for keeping and protecting the normally-closed state of a switch contact of a relay for grounding coupling and responding to an error indication signal, so that the switch contact of the relay is opened; the output of the injection current control module is coupled to the switch contact of the relay, and the injection current control module is used for continuously injecting current through the output end of the injection current control module to make the current pass through the closed switch contact of the relay. DE 10 2012 219542 A1 discloses a protective conductor monitoring device and a method for monitoring a protective conductor. The device has a reference potential generator for providing a reference potential from voltage potentials of two power source conductors. A test current generator generates a test current depending on the reference potential. A detector produces a light depending the test current. An evaluation device evaluates the light produced by the detector. The reference potential generator comprises a capacitor and a diode. A sensor is provided for a capacitive and/or for a galvanic coupling to a ground potential. CN 104 155 505 A discloses an earth wire live detection device. The earth wire live detection device includes a photoelectric coupler whose first input end is connected to an earth wire through a first resistor, second input end is connected to a null line through a second resistor, first output end is connected to a first direct current power supply through a third resistor, and second output end is connected to the ground through a fourth resistor; a controller whose voltage signal acquisition port is connected with the second output end of the photoelectric coupler, when the voltage of the second output end of the photoelectric coupler is larger than a threshold voltage, an alarm signal output port of the controller outputting an alarm signal; and an alarm device which is connected with the alarm signal output port of the controller and outputs a prompt in response to the alarm signal output by the controller. The earth wire live detection device sends out a prompt when electric leakage occurs in electrical equipment but no electric current flows through an earth wire. US 2013/215549 A1 discloses a power supply control device which controls supply of electric power from a power supply of a vehicle to a load of the vehicle by controlling a relay. The relay, which switches the electric connection between the power supply and the load, is able to retain a state of a contact even if transmission of a control signal is stopped. The power supply control device comprises: a control circuit that controls the state of the contact of the relay; a connection circuit that transmits a first control signal to the relay in order to put the contact of the relay into a first state in which the power supply and the load are connected to each other when the control circuit transmits a first instruction signal; a disconnection circuit that transmits a second control signal to the relay in order to put the contact of the relay into a second state in which the power supply and the load are disconnected from each other when the control circuit transmits a second instruction signal; and an a