WO2019225794A1 - Dispositif de réception d'énergie sans contact ayant une fonction de prévention de surtension pour véhicule électrique, système de charge et son procédé de commande - Google Patents

Dispositif de réception d'énergie sans contact ayant une fonction de prévention de surtension pour véhicule électrique, système de charge et son procédé de commande Download PDF

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Publication number
WO2019225794A1
WO2019225794A1 PCT/KR2018/006362 KR2018006362W WO2019225794A1 WO 2019225794 A1 WO2019225794 A1 WO 2019225794A1 KR 2018006362 W KR2018006362 W KR 2018006362W WO 2019225794 A1 WO2019225794 A1 WO 2019225794A1
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Prior art keywords
voltage
smoothing capacitor
overvoltage
contact power
output
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PCT/KR2018/006362
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English (en)
Korean (ko)
Inventor
유효열
조정구
문용기
한정호
유주승
김민호
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(주)그린파워
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Publication of WO2019225794A1 publication Critical patent/WO2019225794A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B60L53/10—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles characterised by the energy transfer between the charging station and the vehicle
    • B60L53/12—Inductive energy transfer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
    • B60L3/0092—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption with use of redundant elements for safety purposes
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L2200/00—Type of vehicles
    • B60L2200/12—Bikes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
    • B60Y2200/00—Type of vehicle
    • B60Y2200/10—Road Vehicles
    • B60Y2200/13—Bicycles; Tricycles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
    • B60Y2200/00—Type of vehicle
    • B60Y2200/90—Vehicles comprising electric prime movers
    • B60Y2200/91—Electric vehicles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
    • B60Y2200/00—Type of vehicle
    • B60Y2200/90—Vehicles comprising electric prime movers
    • B60Y2200/92—Hybrid vehicles
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/72—Electric energy management in electromobility
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/10—Technologies relating to charging of electric vehicles
    • Y02T90/14—Plug-in electric vehicles

Definitions

  • the present invention relates to an overvoltage preventing means having an electric vehicle overvoltage protection function, a non-contact power receiving device and a non-contact power feeding device, and a control method thereof, and more particularly, to prevent a failure of a high-voltage system in a vehicle due to an overvoltage that may be induced when charging stops.
  • the present invention relates to an overvoltage preventing means, a non-contact power receiving device, a non-contact power supply device, and a control method thereof.
  • a high voltage system such as the non-contact power receiver 200, an inverter, a converter, etc. is commonly connected to the other side of the battery main relay connected to one side of the battery (hereinafter, "DC").
  • the non-contact power receiver 200, an inverter, a converter, and the like have a smoothing capacitor at the DC link connection.
  • the high voltage component connected to the DC link may be various components such as an electric water pump and a PTC heater in addition to an inverter and a converter.
  • the in-vehicle controller turns off the battery main relay to disconnect the battery from the system.
  • the electric vehicle means not only a pure electric vehicle, but also a mobile vehicle that travels using charging energy such as a plug-in hybrid, a rechargeable fuel cell vehicle, and an electric bicycle.
  • the wireless charging system may be configured with an LC-LC method using an inductor and a capacitor as shown in FIG. 2A, or an LCCL-LCCL method using a plurality of inductors and capacitors as shown in FIG. 2B.
  • the power supply device of the LC-LC method or LCCL-LCCL method circuit and the input filter circuit of the current collector can be equivalently modeled as a sine wave current source as shown in FIG. 3A.
  • the power receiving device 230 is connected to the battery 301 mounted on the electric vehicle to charge the battery 301, the battery main relay (between the power receiving device and other electric devices (not shown in the figure) and the battery ( 302 serves to block the battery charging or discharging path.
  • the control of the battery main relay 302 may be performed by a controller (for example, a battery management system (BMS), not shown) provided in the electric vehicle.
  • BMS battery management system
  • the battery main relay 302 When the battery main relay 302 is turned off during wireless charging, since the input filter circuit functions as a current source, the current charging the battery 301 continuously drives the smoothing capacitor 234 located in front of the battery main relay 302. By charging, the voltage of the capacitor is increased to generate an overvoltage, which not only causes the smoothing capacitor burnout, shorten the life of the power receiver, damage or deteriorate, but also shorten or shorten the life of components of the electrical device connected to the same node. In a point that may cause the power supply to the power supply device must be stopped through the wired or wireless communication between the electric vehicle controller such as BMS and the power supply device outside the vehicle before turning off the battery main relay 302.
  • the delay of information transmission according to the time delay may cause the power supply device to supply power during the delayed time, which is connected to the power receiver and the connected device. It can damage the electrical equipment.
  • the in-vehicle controller does not turn off the battery main relay, when the electrical connection between the power receiver and the battery 310 is cut off for various reasons such as damage to the battery main relay 302 itself or disconnection of the battery 301 connecting cable. May occur. In this case, the in-vehicle controller cannot transmit the battery main relay off information to the feeder in advance, which can cause a relatively larger overvoltage, which can damage the power receiving device and the connected electrical device.
  • a non-contact power receiving device for electric vehicles, a power supply device, and a control method thereof including an overvoltage prevention means capable of preventing overvoltage generated when the current received from a power supply device having a current source characteristic is temporarily blocked to improve system safety. to provide.
  • the non-contact power receiving device is provided in the interior of the electric vehicle, the power receiving unit for receiving power from the non-contact power supply device, the filter unit connected to the output of the power receiving unit, the rectifying unit connected to the output of the filter unit, the overvoltage protection connected to the output of the rectifying unit Means, an overvoltage protection means and a smoothing capacitor connected to a DC link (N0) to which the battery main relay is connected, wherein the overvoltage prevention means blocks the smoothing capacitor charge current and the discharge current based on the voltage of the smoothing capacitor to overvoltage the smoothing capacitor.
  • the circuit can be configured so that the current received from the non-contact power supply device can flow through a closed loop path different from the smoothing capacitor charging path so that the rate of change of the received current is equal to or less than a predetermined value.
  • the overvoltage protection means can provide a shorted path at the front or rear of the rectifier to prevent the rectified current from charging the smoothing capacitor.
  • the overvoltage preventing means determines whether the overvoltage protection condition is applicable based on the series diode provided between the rectifier and the smoothing capacitor, the protection switch provided in parallel between the rectifier and the series diode, and the voltage of the smoothing capacitor, and based on the determination result.
  • the protection switch when the output N1 of the rectifier part is connected to the anode side of the series diode, and the anode of the smoothing capacitor is connected to the cathode side of the series diode, the protection switch is turned on (closed).
  • the node N1, which is an output of the rectifier, and the smoothing capacitor anode N0 may be electrically disconnected to prevent current from flowing between the rectifier, the protection switch, and the smoothing capacitor.
  • the protection switch when the protection switch is turned on, a reverse voltage is applied to the series diode so that the current of the smoothing capacitor may not flow through the protection switch, which may be a large capacity of the smoothing capacitor, and further, an inverter and a converter. Due to the characteristics of the electric vehicle that the smoothing capacitors of which can be connected in parallel, there is an effect of preventing excessive current from flowing to the protection switch, and shortening the life of the capacitor.
  • the overvoltage prevention means determines whether an overvoltage protection condition is applicable based on a gate switch provided between the rectifier and the smoothing capacitor, a protection switch provided in parallel between the rectifier and the gate switch, and a voltage at both ends of the smoothing capacitor, and based on the determination result.
  • Control means for controlling the gate switch and the protection switch.
  • the gate switch may be one of a relay or a MOSFET
  • the protection switch may be one of a thyristor, a MOSFET, an IGBT, or a SiCMOSFET.
  • the current flows through a switch such as a MOSFET having a relatively low on-resistance (drain-source resistance) instead of a diode (the series diode) during normal battery charging when the battery main relay is on.
  • a switch such as a MOSFET having a relatively low on-resistance (drain-source resistance) instead of a diode (the series diode) during normal battery charging when the battery main relay is on.
  • the use of a MOSFET has a small voltage drop, so that the loss can be reduced and the efficiency can be improved.
  • the control means inputs the voltage across the smoothing capacitor, and outputs the voltage signal corresponding to the voltage across the smoothing capacitor.
  • the input and output are electrically insulated voltage meter and the output of the isolated voltage meter and
  • a voltage comparator comparing the reference voltage, a switch driver controlling on or off of the protection switch and the gate switch based on the output of the voltage comparator, and a signal inverter between the output of the voltage comparator and the switch driver for the gate switch may be provided. .
  • the signal inverter is located between the driver for the protective switch and the comparator, during the time delay by the signal inverter, the current flow path by the current source is temporarily interrupted, so that a significant overvoltage at the switch stage is obtained. Since the deterioration of the components such as the switch may reduce the life of the components such as the switch and cause burnout, there is an effect that the signal inverter is provided between the driver for the protective switch and the comparator and the comparator, not the comparator.
  • control means inputs the voltage across the smoothing capacitor, and outputs a voltage signal corresponding to the voltage across the smoothing capacitor.
  • the input and output are electrically insulated voltage meter and the output of the isolated voltage meter.
  • a switch driver for controlling the on or off of the protection switch and the gate switch based on the respective outputs of the first and second voltage comparators and the first and second voltage comparators for comparing the predetermined reference voltages.
  • protection switch and the gate switch may use the same switch.
  • a non-contact power receiving device including an over-voltage protection means for an electric vehicle is provided in the interior of the electric vehicle, the power receiving unit for receiving power from the non-contact power supply, the filter unit connected to the output of the power receiving unit, the rectifying unit connected to the output of the filter unit And a smoothing capacitor connected to the DC link N0 to which the output of the rectifier and the battery main relay are connected, and an overvoltage preventing means connected to one end of the output of the filter part and connected to a negative electrode and the other side of the smoothing capacitor.
  • Blocking the smooth capacitor charge current and discharge current based on the voltage of the capacitor prevents overvoltage from occurring in the smooth capacitor, and configures a closed loop path through which the current received from the non-contact power supply device can flow. It can be made below a predetermined value.
  • the overvoltage protection means includes: first and second protection diodes having an anode connected to an input node N2 of the rectifier, one side of which is commonly connected to the cathodes of the first and second protection diodes, and the other side of which is connected to ground (G).
  • the control unit 434 may determine whether the overvoltage protection condition is applicable based on the voltage of the switch and the smoothing capacitor, and control the protection switch based on the determination result.
  • the current flows directly through the lead wires without passing through a switch such as a diode (the series diode) or a MOSFET during normal battery charging when the battery main relay is turned on, thereby improving charging efficiency.
  • a switch such as a diode (the series diode) or a MOSFET during normal battery charging when the battery main relay is turned on, thereby improving charging efficiency.
  • the overvoltage protection means can be additionally installed in the non-contact power receiving device that does not have the overvoltage protection function in use, there is an economic effect.
  • the control means inputs the voltage of both ends of the smoothing capacitor and outputs the voltage signal corresponding to the voltage of both ends of the smoothing capacitor.
  • the input and output are electrically insulated voltage meter and the output of the isolated voltage meter and predetermined
  • a voltage comparator for comparing the reference voltage, and a switch driver for controlling the on or off of the protection switch based on the output of the voltage comparator.
  • a predetermined value compared with the rate of change of the voltage between the both ends may be set based on the capacitance value of the smoothing capacitor.
  • the predetermined value compared with the rate of change of the voltage between the both ends may be set based on the capacitance value of the smoothing capacitor and the capacitance value of the capacitor of the electric device commonly connected to the DC link.
  • a non-contact charging system having an overvoltage protection function for an electric vehicle including the non-contact power receiving device and the non-contact power supply as described above, wherein the non-contact power supply is a measuring unit for measuring the amount of power or current supplied by the non-contact power supply during charging.
  • a determination unit for determining that the overvoltage protection function of the non-contact power receiving device has been performed when the state of the measured power amount or current amount smaller than the predetermined value lasts for a predetermined time; It may include a control unit for controlling the power feeding device.
  • the current source when charging an in-vehicle battery by a non-contact power supply of an electric vehicle, when the battery connection path is interrupted, the current source at the same time quickly inhibits charging of the smoothing capacitor connected to the DC link by the power received from the power supply. It can cut off the current received from the power feeding device at a time to prevent overvoltage from occurring, thereby improving safety, improving efficiency during charging, and using simple circuit elements for controlling economic advantages and high reliability.
  • there is an effect such as fast control operation, no need to communicate with the host controller or the vehicle controller, and there is an economic effect that the overvoltage protection means can be installed in a power receiving device that does not have an existing overvoltage protection function.
  • FIG. 1 is a diagram illustrating an electric vehicle including a non-contact power supply device, a current collector, an inverter, a motor, a converter, and the like.
  • 2A and 2B are diagrams showing an example of a circuit configuration of a conventional non-contact power feeding device and power receiving device.
  • 2A and 2B show a configuration of an LC-LC and LCCL-LCCL non-contact charging circuit, respectively.
  • 3A and 3B are diagrams showing an equivalent circuit configuration of the conventional non-contact power feeding device and power receiving device shown in FIGS. 2A and 2B, and an example of a battery charging current and a smoothing capacitor voltage when the battery main relay is turned off.
  • FIG. 4 is a diagram showing an example of a circuit configuration of an overvoltage protection means for a non-contact power receiving device according to Embodiment 1 of the present invention.
  • 5A to 5E are diagrams showing an example of a circuit configuration of the overvoltage protection means for a non-contact power receiving device according to the second embodiment of the present invention.
  • 6A to 6C are diagrams showing an example of a circuit configuration of the overvoltage protection means for a non-contact power receiving device according to Embodiment 3 of the present invention.
  • FIG. 1 illustrates an electric vehicle including a non-contact power supply device and a current collector and an inverter, a motor, a converter, and the like.
  • 2A and 2B illustrate a charging system including a non-contact power supply device and a current collector for a conventional electric vehicle.
  • 2A and 2B show non-contact power supply devices 101 and 102 and current collectors 210 and 220 for an LC-LC method and an LCCL-LCCL method electric vehicle, respectively, which are conventionally used.
  • 3A illustrates an equivalent circuit of the non-contact power supply devices 101 and 102 and the current collectors 210 and 220 for the LC-LC method or the LCCL-LCCL method electric vehicle.
  • the power receiving portion and the filter portion of the non-contact power feeding device and the non-contact power receiving device can be equivalently viewed as a current source, which is shown as a sine wave current source 103.
  • 3B shows the battery charge current (upper figure) and the voltage of the smoothing capacitor 234 (lower figure). When the battery main relay is turned off (opened), the battery charging current becomes zero, and the voltage of the smoothing capacitor 234 is increased, indicating a conventional problem that overvoltage is induced.
  • the non-contact power receiver 230 is provided inside the electric vehicle, and includes a power receiver 231 for receiving electric power from the non-contact power feeder, and a filter unit 232 connected to the output of the power receiver 231.
  • the rectifier 233 connected to the output of the filter unit 232, the overvoltage preventing unit 410 connected to the output of the rectifying unit 233, the DC link N0 to which the overvoltage preventing unit 410 is connected to the battery main relay 302.
  • a smoothing capacitor 234 connected to it.
  • the filter unit 232 may be a resonant network.
  • the power receiver 231 receives the power delivered in the form of a magnetic field
  • the rectifier 233 may be configured as a bridge circuit using a diode
  • the smoothing capacitor functions to smooth the output voltage of the rectifier 233.
  • one side of the battery main relay 302 is connected to the battery 301, the other side is connected to the DC link (N0), the DC link is an electrical device (for example, an inverter using the charging energy of the battery 301) , Converter, etc., not shown in the drawing), a power receiving device (charger) may be commonly connected.
  • the DC link is an electrical device (for example, an inverter using the charging energy of the battery 301) , Converter, etc., not shown in the drawing), a power receiving device (charger) may be commonly connected.
  • the overvoltage preventing means 410 blocks the smoothing capacitor 234 charging current and the discharging current based on the voltage of the smoothing capacitor 234 to prevent the overvoltage from occurring in the smoothing capacitor 234,
  • a closed loop path through which the electric current received from the non-contact power supply devices 101 and 102 can flow can be configured so that the rate of change of the electric current received is less than or equal to a predetermined value.
  • the overvoltage protection means can provide a shorted path at the front or rear of the rectifier to prevent the rectified current from charging the smoothing capacitor.
  • the overvoltage preventing means 410 may include a series diode 411 provided between the rectifier 233 and the smoothing capacitor 234, and a protection switch provided in parallel between the rectifier 233 and the series diode 411. 412, and a control means for determining whether the overvoltage protection condition is applicable based on the voltage of the smoothing capacitor 234, and controlling the protection switch 412 based on the determination result.
  • control means inputs the voltage across the smoothing capacitor 234 and outputs a voltage signal corresponding to the voltage across the smoothing capacitor 234, but the input and output are electrically insulated voltage measuring devices.
  • a voltage comparator comparing the output of the isolated voltage meter with a predetermined reference voltage, and a switch driver controlling on or off of the protection switch based on the output of the voltage comparator.
  • whether or not the overvoltage protection condition corresponds to the overvoltage protection condition may be determined when the rate of change of the voltage across the smoothing capacitor 234 exceeds a predetermined value.
  • a discharge resistor system for discharging a DC link capacitor of an electric device (eg, an inverter or a converter) commonly connected to the DC link may be provided (not shown).
  • the control means of the overvoltage preventing means directly transmits a driving signal to the discharge resistance system to operate the discharge resistance system, or transmits a forced discharge signal to a controller of the electric device so that the controller of the electric device controls the discharge resistance system. I can drive it.
  • the discharge resistor system can lower the voltage of the DC link by discharging the smoothing capacitor.
  • control means of the overvoltage protection means (Wake-up) to switch the controller of the electrical device (inverter, etc.) commonly connected to the DC link from the sleep mode to the active mode when the battery main relay is turned off Function).
  • the overvoltage prevention means may instruct a forced discharge of the controller of the activated electric device (inverter, etc.).
  • the controller of the inverter activated by the overvoltage preventing means may discharge the capacitor connected to the DC link by applying a current to the motor using an inverter commonly connected to the DC link.
  • the current applied by the inverter may be characterized in that the current is controlled so as not to rotate the motor.
  • the controller of the converter activated by the control means of the overvoltage protection means can discharge the capacitor connected to the DC link by charging or supplying power to the auxiliary battery or the electric load connected to the auxiliary battery using a converter commonly connected to the DC link.
  • the electric load may be forcibly turned on (operation).
  • the electric load may be limited to the electric load that is not recognized by the user as the five senses.
  • the electric load may be a coolant water pump, a radiator fan, a battery cooling fan, a PTC heater, an electric oil pump, or the like.
  • the overvoltage preventing means may simultaneously perform at least one or more of the overvoltage preventing methods described above.
  • the series diode 411 is connected to the output N1 of the rectifier 233 and the anode side of the series diode 411, and has an anode of the smoothing capacitor 234 and a series diode 411.
  • the node N1 which is an output of the rectifier 233
  • the anode N0 of the smoothing capacitor 234 are electrically separated from each other. A current may not flow between the rectifier 233 and the protection switch 412 and the smoothing capacitor 234.
  • the non-contact power receiver 230 is provided inside the electric vehicle, and includes a power receiver 231 for receiving electric power from the non-contact power feeder, and a filter unit 232 connected to the output of the power receiver 231.
  • the rectifier 233 connected to the output of the filter unit 232, the overvoltage preventing unit 420 connected to the output of the rectifying unit 233, the DC link N0 to which the overvoltage preventing unit 420 is connected to the battery main relay 302.
  • a smoothing capacitor 234 connected to it.
  • the overvoltage preventing means 420 blocks the smoothing capacitor 234 charging current and the discharging current based on the voltage of the smoothing capacitor 234 to prevent the overvoltage from occurring in the smoothing capacitor 234,
  • a closed loop path through which the electric current received from the non-contact power supply devices 101 and 102 can flow can be configured so that the rate of change of the electric current received is less than or equal to a predetermined value.
  • the overvoltage protection means can provide a shorted path at the front or rear of the rectifier to prevent the rectified current from charging the smoothing capacitor.
  • the overvoltage protection means 420 may include a gate switch 421 provided between the rectifier 233 and the smoothing capacitor 234, and a protection switch provided in parallel between the rectifier 233 and the gate switch 421. 422, and a control means 423 for determining whether the overvoltage protection condition is applicable based on the voltage across the smoothing capacitor 234, and controlling the gate switch 421 and the protection switch 422 based on the determination result. can do.
  • the gate switch 421 may be one of a relay and a MOSFET
  • the protection switch 422 may be one of a thyristor, a MOSFET, an IGBT, or a SiC MOSFET.
  • the MOSFET has a small forward voltage reduction compared to the forward voltage reduction of the diode, so that the charging efficiency can be increased.
  • the control means inputs a voltage across the smoothing capacitor 234 and outputs a voltage signal corresponding to the voltage across the smoothing capacitor 234.
  • An electrically insulated isolated voltage meter, a voltage comparator for comparing the output of the isolated voltage meter with a predetermined reference voltage, a switch driver for controlling on or off of the protective switch and the gate switch based on the output of the voltage comparator, and a voltage A signal inverter may be provided between the output of the comparator and the switch driver for the gate switch 421.
  • a signal inverter may be provided between the output of the voltage comparator and the switch driver for the protection switch 422.
  • control means inputs the voltage across the smoothing capacitor 234 and outputs the voltage signal corresponding to the voltage across the smoothing capacitor 234, but the input and the output are electrically An isolated isolated voltage meter, a voltage comparator for comparing the output of the isolated voltage meter with a predetermined reference voltage, a switch driver for controlling on or off of the protective switch and the gate switch based on the output of the voltage comparator, and a voltage comparator A signal inverter may be provided between the output and the switch driver for the gate switch 421.
  • control means includes a proportional voltage (a node voltage) of the DC link voltage N0 and a G node, a predetermined first voltage Vref_high, and a second voltage Vref_low. Compare and generate on or off signals SW1 and 2 of the protection switch and the gate switch based on the comparison.
  • the node a voltage can generate a voltage proportional to the DC link voltage using a plurality of resistors, as shown in FIG. 5C.
  • the node a voltage may generate a voltage proportional to the DC link voltage using one resistor, a zener diode, and a capacitor.
  • the control means selects the predetermined first voltage Vref_high and the second voltage Vref_low, and turns off the SW1 terminal when the DC link voltage is lower than the lower limit of the battery voltage usage range. And a hysteresis property such that the DC link voltage generates an on signal to the switch SW1 terminal at a voltage higher than the upper limit of the battery voltage usage range.
  • the auxiliary power supply for supplying the power of the control means must operate even when the power is not supplied, the auxiliary power can be connected to the smoothing capacitor to obtain the power.
  • the smoothing capacitor is gradually discharged by the power consumed by the auxiliary power supply.
  • the protection switch is lower than the lower reference voltage of the hysteresis, the protection switch is turned off and the gate switch is turned on to increase the smoothing capacitor voltage again. The ground side inverter can then be notified to stop the ground side inverter.
  • the non-contact power receiving device 230 including the overvoltage preventing means for an electric vehicle is provided inside the electric vehicle and includes the power receiving unit 231 and the power receiving unit 231 which receive electric power from the non-contact power feeding device.
  • Filter unit 232 connected to the output, rectifier 233 connected to the output of the filter unit 232, smoothing capacitor 234 connected to the DC link (N0) connected to the output of the rectifier 233 and the battery main relay 302
  • the output of the filter unit 232 is connected to one side, and the negative electrode and the other side of the smoothing capacitor 234 includes an overvoltage preventing means 430, the overvoltage preventing means 430, the voltage of the smoothing capacitor 234
  • the rate of change of received current is below a predetermined value Can be
  • the overvoltage protection means 430 includes first and second protection diodes 431 and 432 having an anode connected to the input nodes N2 and N3 of the rectifying unit 233, and one side of the first and second protection diodes 431 and 432. Based on the voltage of the protection switch 433 and the smoothing capacitor 234 connected in common with the cathodes of the diodes 431 and 432 and the other side connected to the ground G, it is determined whether the overvoltage protection condition is applicable, and the determination result. Control means 434 for controlling the protection switch 433 based on the.
  • control means inputs the voltage across the smoothing capacitor 234 and outputs a voltage signal corresponding to the voltage across the smoothing capacitor 234, but the input and output are electrically insulated voltage measuring devices.
  • a voltage comparator comparing the output of the isolated voltage meter with a predetermined reference voltage, and a switch driver controlling on or off of the protection switch based on the output of the voltage comparator.
  • whether or not the overvoltage protection condition corresponds to the overvoltage protection condition may be determined when the rate of change of the voltage across the smoothing capacitor 234 exceeds a predetermined value.
  • the outputs N2 and N3 of the filter unit 232 may have a sine wave shape, and when the voltage difference between N2 and N3 is V23, if V23 is a positive value, the first protection diode 431 and the protection switch ( 433) and a lower diode (so that current flows from G to N3) of one arm of the rectifier can be conducted, and if V23 is a negative value, the second protection diode 432, the protection switch 433, and the other arm of the rectifier The bottom diode of G (so that current flows from G to N2) may be conducted.
  • the non-contact power supply includes a measuring unit for measuring the amount of power or current supplied by the non-contact power supply during charging, measurement
  • the determination unit that determines that the overvoltage protection function of the non-contact power receiving device 230 is performed, and the supply of the charging power is stopped based on the result of the determination. It may include a control unit for controlling the non-contact power supply device.
  • the rectifier input terminal voltage of the power receiving device can be zero, and therefore, the output current of the power feeding device can also be 0, and the output current of the power feeding device is maintained at 0 for a predetermined time.
  • the operation of the power supply device can be stopped for overvoltage protection without the separate communication between the power supply device and the power reception device or the power supply device and the vehicle control period.
  • the predetermined reference value is an average value of the measured amount of electric power or amount of electric current during a predetermined previous time from the time when the charge amount SOC of the battery 301 of the electric vehicle, the amount of electric power or the amount of electric current is measured, and the information provided by the controller of the electric vehicle. It may be determined based on at least one of the. According to such a configuration, it is possible to quickly determine whether the overvoltage protection function is operating, and to prevent a current such as heat generation and a decrease in life due to the continuous flow of current through a protection switch.
  • the predetermined previous time may be set within a range of 30 seconds to 30 minutes.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)

Abstract

La présente invention aborde un problème relatif aux corps mobiles, tels que des véhicules purement électriques, des hybrides enfichables, des bicyclettes électriques, et analogues, qui sont propulsés en utilisant de l'énergie électrique chargée par le biais d'une charge sans contact. Lorsqu'une batterie est séparée d'un système en raison d'un arrêt de la charge, d'une défaillance du système ou analogue, une surtension est provoquée dans un système à haute tension, ce qui entraîne une défaillance ou une durée de vie réduite d'un composant à haute tension. La solution selon la présente invention porte sur un dispositif de réception d'énergie sans contact ayant une fonction de prévention de surtension pour véhicule électrique, un système de charge et son procédé de commande. Selon l'invention : un moyen de prévention de surtension est utilisé dans un dispositif de réception d'énergie et empêche l'énergie d'être délivrée à un système à haute tension tout en assurant un trajet en boucle fermée pour un courant de réception d'énergie afin d'empêcher une surtension de commutation qui se produit lorsque le courant de réception d'énergie est coupé. Le moyen de prévention de surtension peut décharger le système à haute tension pour assurer la sécurité du système sans ajout d'un système de décharge séparé, ou peut améliorer la sécurité, l'efficacité de charge et le rendement énergétique du système par conversion de l'énergie à utiliser pour un usage différent.
PCT/KR2018/006362 2018-05-24 2018-06-04 Dispositif de réception d'énergie sans contact ayant une fonction de prévention de surtension pour véhicule électrique, système de charge et son procédé de commande WO2019225794A1 (fr)

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KR1020180059283A KR101946027B1 (ko) 2018-05-24 2018-05-24 전기차 과전압 방지 기능을 갖는 비접촉 수전장치, 충전 시스템 및 그 제어 방법

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CN112816911A (zh) * 2021-01-04 2021-05-18 福建万润新能源科技有限公司 新能源车辆电机控制器高压异常断路的检测方法及系统
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CN114179647A (zh) * 2020-09-15 2022-03-15 北京新能源汽车股份有限公司 一种无线充电控制方法、装置和车辆
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CN113212168A (zh) * 2021-05-19 2021-08-06 广州小鹏汽车科技有限公司 一种直流放电电路、控制方法以及一种电动汽车

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