JP2021083137A - Charge control device - Google Patents

Charge control device Download PDF

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JP2021083137A
JP2021083137A JP2018046619A JP2018046619A JP2021083137A JP 2021083137 A JP2021083137 A JP 2021083137A JP 2018046619 A JP2018046619 A JP 2018046619A JP 2018046619 A JP2018046619 A JP 2018046619A JP 2021083137 A JP2021083137 A JP 2021083137A
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battery
state
voltage
charging
unit
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宮崎　英樹
Hideki Miyazaki
英樹 宮崎
孝徳 山添
Takanori Yamazoe
孝徳 山添
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Hitachi Astemo Ltd
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Hitachi Astemo Ltd
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Priority to JP2018046619A priority Critical patent/JP2021083137A/en
Priority to PCT/JP2019/003782 priority patent/WO2019176369A1/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
    • 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
    • B60L53/14—Conductive energy transfer
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/385—Arrangements for measuring battery or accumulator variables
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/392—Determining battery ageing or deterioration, e.g. state of health
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/44—Methods for charging or discharging
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/46—Accumulators structurally combined with charging apparatus
    • 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
    • H02J50/12—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling of the resonant type
    • 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
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • 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
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
    • 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
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using 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
    • Y02T10/70—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
    • 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

Abstract

To perform an appropriate charge control corresponding to the state of a battery when charging the battery falling into a power shortage state.SOLUTION: A battery monitoring device 500 functions as a charge control device for controlling the charge of a high voltage battery boarded on an electric vehicle. The battery monitoring device 500 comprises: a cell voltage measurement unit 520 for measuring a voltage of the high voltage battery; a battery state determination unit 511 for determining, based on the measurement result of the voltage of the high voltage battery measured by the cell voltage measurement unit 520, whether a state of the battery corresponding to the state of the high voltage battery is in a first state (deterioration state), a second state (over-discharge state), or a third state (normal power shortage state); and a charge instruction unit 512 for changing a charging method of the high voltage battery based on the determination result of the state of the battery determined by the battery state determination unit 511.SELECTED DRAWING: Figure 4

Description

本発明は、電池の充電を制御する充電制御装置に関する。 The present invention relates to a charge control device that controls charging of a battery.

近年、電池に充電された電力を用いて走行用モータを駆動させることで走行可能な電気自動車等の電動車両が広く利用されている。こうした電動車両では、電池の放電が進んで電欠状態に陥ると走行不能になるため、走行可能な状態へと安全かつ速やかに復帰できるような充電方法が望まれている。 In recent years, electric vehicles such as electric vehicles that can travel by driving a traveling motor using electric power charged in a battery have been widely used. In such an electric vehicle, if the battery is discharged and the battery runs out of electricity, the vehicle cannot run. Therefore, a charging method that can safely and quickly return to the runnable state is desired.

電池が電欠状態に陥った場合の充電方法に関して、下記の特許文献１が知られている。特許文献１には、交流入力電圧を整流して倍電圧に昇圧するためのコンデンサを有する倍電圧整流回路部と、直流入力電圧を交流電圧に変換して所定の電圧レベルに昇圧し、上記倍電圧整流回路部のコンデンサに常時交流電圧を印加する変換回路部と、モータへ駆動電力を供給するための主バッテリと上記倍電圧整流回路部との間に介装され、上記主バッテリを充電しないときには、上記主バッテリと上記倍電圧整流回路部とを切り離し、上記主バッテリを充電するとき、上記主バッテリと上記倍電圧整流回路部とを接続する開閉部とを備えた電気自動車のバッテリ充電装置が開示されている。 The following Patent Document 1 is known with respect to a charging method when a battery falls into a power shortage state. Patent Document 1 describes a voltage doubler rectifying circuit unit having a capacitor for rectifying an AC input voltage and boosting it to a double voltage, and converting a DC input voltage into an AC voltage to boost the voltage to a predetermined voltage level. It is interposed between the conversion circuit unit that constantly applies AC voltage to the capacitor of the voltage rectifier circuit unit, the main battery for supplying drive power to the motor, and the voltage doubler rectifier circuit unit, and does not charge the main battery. Occasionally, a battery charging device for an electric vehicle provided with an opening / closing unit for connecting the main battery and the voltage doubler rectifying circuit unit when the main battery and the voltage doubler rectifying circuit unit are separated and the main battery is charged. Is disclosed.

特開２０００−２９９９０２号公報Japanese Unexamined Patent Publication No. 2000-299902

電気自動車において走行用モータの駆動に広く利用されているリチウムイオン電池は、電欠状態で長期間放置されると、通常よりも放電が進んだ過放電状態となり、通常時よりも低電流での充電が必要になることがある。また、過放電状態から放電がさらに進むと電池が劣化し、充電が不可能になることもある。しかしながら、特許文献１に記載のバッテリ充電装置では、電欠状態に陥った電池を充電する際に、こうした電池状態の違いを考慮した適切な充電制御を行うことができない。 Lithium-ion batteries, which are widely used to drive driving motors in electric vehicles, become over-discharged when left unattended for a long period of time in a power-deficient state, resulting in an over-discharged state in which the current is lower than usual. May need to be charged. In addition, if the battery is further discharged from the over-discharged state, the battery may deteriorate and charging may not be possible. However, in the battery charging device described in Patent Document 1, when charging a battery that has fallen into a power shortage state, it is not possible to perform appropriate charging control in consideration of such a difference in battery state.

本発明による充電制御装置は、電動車両に搭載された電池の充電を制御するものであって、前記電池の電圧を計測する電圧計測部と、前記電圧計測部による前記電池の電圧の計測結果に基づいて、前記電池の状態に対応する電池状態が第１の状態、第２の状態または第３の状態のいずれであるかを判定する電池状態判定部と、前記電池状態判定部による前記電池状態の判定結果に基づいて、前記電池の充電方法を切り替える充電指示部と、を備える。 The charge control device according to the present invention controls the charging of a battery mounted on an electric vehicle, and is based on a voltage measuring unit that measures the voltage of the battery and a measurement result of the voltage of the battery by the voltage measuring unit. Based on this, the battery state determination unit that determines whether the battery state corresponding to the battery state is the first state, the second state, or the third state, and the battery state by the battery state determination unit. The battery is provided with a charging instruction unit for switching the charging method of the battery based on the determination result of the above.

本発明によれば、電欠状態に陥った電池を充電する際に、電池状態に応じた適切な充電制御を行うことができる。 According to the present invention, when charging a battery that has fallen into a power shortage state, it is possible to perform appropriate charge control according to the battery state.

本発明の一実施形態に係る無線給電システムの構成を示す図である。It is a figure which shows the structure of the wireless power supply system which concerns on one Embodiment of this invention. 本発明の一実施形態に係る受電装置の構成例を示す図である。It is a figure which shows the structural example of the power receiving device which concerns on one Embodiment of this invention. 本発明の一実施形態に係る無線給電システムの通常充電時の処理フローを示す図である。It is a figure which shows the processing flow at the time of normal charging of the wireless power supply system which concerns on one Embodiment of this invention. 本発明の一実施形態に係る電池監視装置の機能ブロック図である。It is a functional block diagram of the battery monitoring device which concerns on one Embodiment of this invention. 高圧電池を電欠状態から復帰させる際の充電制御の処理フローの一例を示す図である。It is a figure which shows an example of the processing flow of charge control at the time of returning a high-voltage battery from an electric shortage state.

以下、図面を参照して、本発明に係る充電制御装置の実施の形態について説明する。 Hereinafter, embodiments of the charge control device according to the present invention will be described with reference to the drawings.

図１は、本発明の一実施形態に係る無線給電システム１の構成を示す図である。図１に示す無線給電システム１は、電気自動車等の車両への無線給電において利用されるものであり、車両付近の地上側に設置された送電装置１００と、車両側にそれぞれ搭載された受電装置２００、高圧電池３００、負荷４００および電池監視装置５００とを有する。 FIG. 1 is a diagram showing a configuration of a wireless power supply system 1 according to an embodiment of the present invention. The wireless power supply system 1 shown in FIG. 1 is used for wireless power supply to a vehicle such as an electric vehicle, and is a power transmission device 100 installed on the ground side near the vehicle and a power receiving device mounted on the vehicle side, respectively. It has 200, a high-voltage battery 300, a load 400, and a battery monitoring device 500.

送電装置１００は、送電制御部１１０、通信部１２０、交流電源１３０、電力変換部１４０および一次コイルＬ１を備える。送電制御部１１０は、通信部１２０および電力変換部１４０の動作を制御することで、送電装置１００全体の制御を行う。 The power transmission device 100 includes a power transmission control unit 110, a communication unit 120, an AC power supply 130, a power conversion unit 140, and a primary coil L1. The power transmission control unit 110 controls the entire power transmission device 100 by controlling the operations of the communication unit 120 and the power conversion unit 140.

通信部１２０は、送電制御部１１０の制御により、受電装置２００が備える通信部２２０との間で無線通信を行う。この通信部１２０と通信部２２０の無線通信により、無線給電の際に必要な各種情報が送電装置１００と受電装置２００の間で交換される。たとえば、一次コイルＬ１に流れる交流電流の周波数、すなわち一次コイルＬ１から放出される交流磁界の周波数等の情報が、通信部１２０から通信部２２０に送信される。また、高圧電池３００の充電状態（ＳＯＣ）や劣化状態、充電時の許容電流等の情報が、通信部２２０から通信部１２０に送信される。 The communication unit 120 performs wireless communication with the communication unit 220 included in the power receiving device 200 under the control of the power transmission control unit 110. By the wireless communication between the communication unit 120 and the communication unit 220, various information necessary for wireless power supply is exchanged between the power transmission device 100 and the power reception device 200. For example, information such as the frequency of the alternating current flowing through the primary coil L1, that is, the frequency of the alternating magnetic field emitted from the primary coil L1 is transmitted from the communication unit 120 to the communication unit 220. In addition, information such as the charging state (SOC) and deterioration state of the high-voltage battery 300 and the allowable current during charging is transmitted from the communication unit 220 to the communication unit 120.

交流電源１３０は、たとえば商用電源であり、所定の交流電力を電力変換部１４０に供給する。電力変換部１４０は、送電制御部１１０の制御により、交流電源１３０から供給された交流電力を用いて所定の周波数および電流値の交流電流を一次コイルＬ１に出力する。一次コイルＬ１は、車両の下に位置する地上側に設置されており、電力変換部１４０から流される交流電流に応じた交流磁界を車両に向けて空中に放出する。これにより、車両への無線給電を行う。 The AC power supply 130 is, for example, a commercial power supply, and supplies a predetermined AC power to the power conversion unit 140. The power conversion unit 140 outputs an alternating current having a predetermined frequency and current value to the primary coil L1 by using the alternating current power supplied from the alternating current power supply 130 under the control of the power transmission control unit 110. The primary coil L1 is installed on the ground side located below the vehicle, and emits an alternating magnetic field corresponding to the alternating current flowing from the power conversion unit 140 toward the vehicle in the air. As a result, wireless power is supplied to the vehicle.

受電装置２００は、受電制御部２１０、通信部２２０、交流電流検出部２３０、駆動制御部２４０、電力変換部２５０、二次コイルＬ２、共振コイルＬｘおよび共振コンデンサＣｘを備える。共振コイルＬｘおよび共振コンデンサＣｘは、二次コイルＬ２に接続されており、二次コイルＬ２とともに共振回路を構成する。この共振回路の共振周波数は、二次コイルＬ２および共振コイルＬｘがそれぞれ有するインダクタンスと、共振コンデンサＣｘが有する静電容量値とに応じて決定される。なお、共振コイルＬｘおよび共振コンデンサＣｘはそれぞれ複数の素子により構成されていてもよい。また、共振コイルＬｘの一部または全部を二次コイルＬ２のインダクタンスで代用してもよい。 The power receiving device 200 includes a power receiving control unit 210, a communication unit 220, an AC current detection unit 230, a drive control unit 240, a power conversion unit 250, a secondary coil L2, a resonance coil Lx, and a resonance capacitor Cx. The resonance coil Lx and the resonance capacitor Cx are connected to the secondary coil L2, and form a resonance circuit together with the secondary coil L2. The resonance frequency of this resonance circuit is determined according to the inductance of the secondary coil L2 and the resonance coil Lx, and the capacitance value of the resonance capacitor Cx. The resonance coil Lx and the resonance capacitor Cx may each be composed of a plurality of elements. Further, a part or all of the resonance coil Lx may be substituted with the inductance of the secondary coil L2.

受電制御部２１０は、通信部２２０および駆動制御部２４０の動作を制御することで、受電装置２００全体の制御を行う。通信部２２０は、受電制御部２１０の制御により、送電装置１００が備える通信部１２０との間で無線通信を行い、送電装置１００と受電装置２００の間で交換される前述のような各種情報を送受信する。通信部２２０が受信した一次コイルＬ１に流れる交流電流の周波数等の情報は、通信部２２０から受電制御部２１０に出力される。 The power receiving control unit 210 controls the entire power receiving device 200 by controlling the operations of the communication unit 220 and the drive control unit 240. The communication unit 220 performs wireless communication with the communication unit 120 included in the power transmission device 100 under the control of the power reception control unit 210, and exchanges various information as described above between the power transmission device 100 and the power reception device 200. Send and receive. Information such as the frequency of the alternating current flowing through the primary coil L1 received by the communication unit 220 is output from the communication unit 220 to the power reception control unit 210.

交流電流検出部２３０は、一次コイルＬ１から放出された交流磁界を二次コイルＬ２が受けることで二次コイルＬ２を含む共振回路に流れる交流電流を検出する。そして、検出した交流電流に応じて周波数と振幅がそれぞれ変化する交流電圧を発生させ、駆動制御部２４０に出力する。駆動制御部２４０は、交流電流検出部２３０から入力された交流電圧に基づいて、共振回路に流れる交流電流の周波数や大きさを取得することができる。 The alternating current detection unit 230 detects the alternating current flowing in the resonant circuit including the secondary coil L2 when the secondary coil L2 receives the alternating magnetic field emitted from the primary coil L1. Then, an AC voltage whose frequency and amplitude change according to the detected AC current is generated and output to the drive control unit 240. The drive control unit 240 can acquire the frequency and magnitude of the AC current flowing through the resonance circuit based on the AC voltage input from the AC current detection unit 230.

駆動制御部２４０は、受電制御部２１０の制御により、電力変換部２５０が有する複数のスイッチング素子のスイッチング動作を制御する。このとき駆動制御部２４０は、交流電流検出部２３０が検出した共振回路に流れる交流電流に基づいて、各スイッチング素子のスイッチング動作のタイミングを変化させる。なお、スイッチング動作のタイミングを変化させる具体的な方法は後述する。 The drive control unit 240 controls the switching operation of a plurality of switching elements included in the power conversion unit 250 under the control of the power reception control unit 210. At this time, the drive control unit 240 changes the timing of the switching operation of each switching element based on the AC current flowing through the resonant circuit detected by the AC current detection unit 230. A specific method for changing the timing of the switching operation will be described later.

電力変換部２５０は、複数のスイッチング素子を有しており、複数のスイッチング素子をそれぞれスイッチング動作させることで、共振回路に流れる交流電流を制御するとともに整流し、交流電力から直流電力への変換を行う。電力変換部２５０には、リレー６１１、６１２を介して充放電可能な高圧電池３００が接続されており、電力変換部２５０から出力される直流電力を用いて高圧電池３００が充電される。リレー６１１、６１２は、電力変換部２５０と高圧電池３００の間を導通または遮断するためのものであり、不図示の車両制御装置によって切り替え状態が制御される。なお、電力変換部２５０と高圧電池３００の間には、高圧電池３００への入力電圧を平滑化するための平滑コンデンサＣ０も接続されている。 The power conversion unit 250 has a plurality of switching elements, and by switching the plurality of switching elements, the AC current flowing in the resonance circuit is controlled and rectified, and the conversion from the AC power to the DC power is performed. Do. A high-voltage battery 300 that can be charged and discharged is connected to the power conversion unit 250 via relays 611 and 612, and the high-voltage battery 300 is charged using the DC power output from the power conversion unit 250. The relays 611 and 612 are for conducting or disconnecting between the power conversion unit 250 and the high-voltage battery 300, and the switching state is controlled by a vehicle control device (not shown). A smoothing capacitor C0 for smoothing the input voltage to the high-voltage battery 300 is also connected between the power conversion unit 250 and the high-voltage battery 300.

高圧電池３００には、リレー６１３、６１４を介して負荷４００が接続される。負荷４００は、高圧電池３００に充電された直流電力を利用して、車両の動作に関する様々な機能を提供する。負荷４００には、たとえば車両駆動用の交流モータや、高圧電池３００の直流電力を交流電力に変換して交流モータに供給するインバータなどが含まれる。リレー６１３、６１４は、高圧電池３００と負荷４００の間を導通または遮断するためのものであり、リレー６１１、６１２と同様に、不図示の車両制御装置によって切り替え状態が制御される。なお、リレー６１４は高圧電池３００と負荷４００を接続した際に流れる突入電流を抑制するためのプリチャージリレーであり、プリチャージ抵抗Ｒｐが直列に接続されている。 A load 400 is connected to the high-voltage battery 300 via relays 613 and 614. The load 400 utilizes the DC power charged in the high-voltage battery 300 to provide various functions related to the operation of the vehicle. The load 400 includes, for example, an AC motor for driving a vehicle, an inverter that converts the DC power of the high-voltage battery 300 into AC power, and supplies the AC motor. The relays 613 and 614 are for conducting or disconnecting between the high-voltage battery 300 and the load 400, and like the relays 611 and 612, the switching state is controlled by a vehicle control device (not shown). The relay 614 is a precharge relay for suppressing the inrush current that flows when the high voltage battery 300 and the load 400 are connected, and the precharge resistor Rp is connected in series.

高圧電池３００と負荷４００の間には、コンバータ６１５が接続されている。コンバータ６１５は低圧電池６１６と接続されており、高圧電池３００から出力された直流電力を降圧して低圧電池６１６に供給することで、低圧電池６１６を充電する。なお、上記とは反対に、低圧電池６１６から出力された直流電力を昇圧して高圧電池３００に供給することで、高圧電池３００を充電できるようにしてもよい。低圧電池６１６は、高圧電池３００よりも低圧の直流電力を車両に搭載された不図示の補機類等に供給するものであり、一端側がコンバータ６１５に接続され、他端側が車両のフレームグランドＦＧに接続されている。 A converter 615 is connected between the high voltage battery 300 and the load 400. The converter 615 is connected to the low-voltage battery 616, and charges the low-voltage battery 616 by lowering the DC power output from the high-voltage battery 300 and supplying it to the low-voltage battery 616. Contrary to the above, the high-voltage battery 300 may be charged by boosting the DC power output from the low-voltage battery 616 and supplying it to the high-voltage battery 300. The low-voltage battery 616 supplies DC power lower than that of the high-voltage battery 300 to auxiliary machinery (not shown) mounted on the vehicle, one end of which is connected to the converter 615 and the other end of the frame ground FG of the vehicle. It is connected to the.

無線給電システム１において、高圧電池３００は、たとえばリチウムイオン電池を用いた複数の電池セルを組み合わせて構成される。一方、低圧電池６１６は、たとえば鉛蓄電池を用いて構成される。ただし、充放電可能な二次電池であり、低圧電池６１６よりも高電圧の直流電力を高圧電池３００が出力できれば、高圧電池３００、低圧電池６１６をそれぞれどのような構成としてもよい。 In the wireless power supply system 1, the high-voltage battery 300 is configured by combining a plurality of battery cells using, for example, a lithium ion battery. On the other hand, the low voltage battery 616 is configured by using, for example, a lead storage battery. However, as long as the high-voltage battery 300 is a secondary battery that can be charged and discharged and can output DC power having a voltage higher than that of the low-voltage battery 616, the high-voltage battery 300 and the low-voltage battery 616 may have any configuration.

次に、図１の無線給電システム１のうち、受電装置２００の詳細について説明する。図２は、本発明の一実施形態に係る受電装置２００の構成例を示す図である。 Next, the details of the power receiving device 200 in the wireless power feeding system 1 of FIG. 1 will be described. FIG. 2 is a diagram showing a configuration example of a power receiving device 200 according to an embodiment of the present invention.

図２に示すように、交流電流検出部２３０は、たとえばトランスＴｒを用いて構成される。一次コイルＬ１から放出された交流磁界による磁束が二次コイルＬ２と鎖交すると、二次コイルＬ２に起電力が生じ、二次コイルＬ２を含む共振回路に交流電流ｉが流れる。この交流電流ｉがトランスＴｒの一次側コイルに流れると、トランスＴｒの二次側コイルの両端に、交流電流ｉに応じて周波数と振幅がそれぞれ変化する交流電圧Ｖｇが発生する。これにより、交流電流検出部２３０は交流電流ｉの検出を行うことができる。なお、共振回路に流れる交流電流ｉを検出できるものであれば、トランスＴｒ以外のものを用いて交流電流検出部２３０を構成してもよい。 As shown in FIG. 2, the AC current detection unit 230 is configured by using, for example, a transformer Tr. When the magnetic flux generated by the AC magnetic field emitted from the primary coil L1 is linked with the secondary coil L2, an electromotive force is generated in the secondary coil L2, and an AC current i flows in the resonance circuit including the secondary coil L2. When this AC current i flows through the primary coil of the transformer Tr, an AC voltage Vg whose frequency and amplitude change according to the AC current i is generated at both ends of the secondary coil of the transformer Tr. As a result, the AC current detection unit 230 can detect the AC current i. If the AC current i flowing in the resonance circuit can be detected, the AC current detection unit 230 may be configured by using something other than the transformer Tr.

電力変換部２５０は、直列接続された２つのＭＯＳトランジスタ（ＭＯＳＦＥＴ）Ｑ１、Ｑ２を有する。ＭＯＳトランジスタＱ１、Ｑ２は、駆動制御部２４０からのゲート駆動信号に応じて、ソース−ドレイン間を導通状態から切断状態へ、または切断状態から導通状態へと切り替えるスイッチング動作をそれぞれ行う。このスイッチング動作により、ＭＯＳトランジスタＱ１を上アームのスイッチング素子として機能させるとともに、ＭＯＳトランジスタＱ２を下アームのスイッチング素子として機能させることができる。ＭＯＳトランジスタＱ１、Ｑ２間の接続点Ｏと、ＭＯＳトランジスタＱ２のソース端子には、二次コイルＬ２を含む共振回路がそれぞれ接続されている。そのため、ＭＯＳトランジスタＱ１、Ｑ２をそれぞれ適切なタイミングでスイッチング動作させることで、共振回路に流れる交流電流ｉの制御および整流を行うことができる。 The power conversion unit 250 has two MOS transistors (MOSFETs) Q1 and Q2 connected in series. The MOS transistors Q1 and Q2 each perform a switching operation of switching between the source and drain from the conductive state to the disconnected state or from the disconnected state to the conductive state according to the gate drive signal from the drive control unit 240. By this switching operation, the MOS transistor Q1 can function as the switching element of the upper arm, and the MOS transistor Q2 can function as the switching element of the lower arm. A resonance circuit including a secondary coil L2 is connected to the connection point O between the MOS transistors Q1 and Q2 and the source terminal of the MOS transistor Q2, respectively. Therefore, by switching the MOS transistors Q1 and Q2 at appropriate timings, it is possible to control and rectify the alternating current i flowing in the resonance circuit.

なお、図２では２つのＭＯＳトランジスタＱ１、Ｑ２をスイッチング素子として用いたハーフブリッジ構成の電力変換部２５０を例示したが、４つのＭＯＳトランジスタをスイッチング素子として用いたフルブリッジ構成の電力変換部２５０としてもよい。以下では図２に示したハーフブリッジ構成の電力変換部２５０による動作例を説明するが、フルブリッジ構成とした場合でも基本的な動作は同様である。 Note that FIG. 2 illustrates a power conversion unit 250 having a half-bridge configuration using two MOS transistors Q1 and Q2 as switching elements, but as a power conversion unit 250 having a full bridge configuration using four MOS transistors as switching elements. May be good. An example of operation by the power conversion unit 250 having a half-bridge configuration shown in FIG. 2 will be described below, but the basic operation is the same even when a full-bridge configuration is used.

駆動制御部２４０は、電圧取得部２４１、駆動信号生成部２４３およびゲート駆動回路２４４を有する。 The drive control unit 240 includes a voltage acquisition unit 241, a drive signal generation unit 243, and a gate drive circuit 244.

電圧取得部２４１は、交流電流検出部２３０（トランスＴｒ）から出力される交流電圧Ｖｇを取得し、駆動信号生成部２４３に出力する。 The voltage acquisition unit 241 acquires the AC voltage Vg output from the AC current detection unit 230 (transformer Tr) and outputs it to the drive signal generation unit 243.

駆動信号生成部２４３には、電圧取得部２４１が取得した交流電圧Ｖｇに加えて、受電制御部２１０から基本駆動信号Ｓｒが入力される。基本駆動信号Ｓｒは、駆動制御部２４０から電力変換部２５０に出力されてＭＯＳトランジスタＱ１、Ｑ２のスイッチング動作を制御するゲート駆動信号の元となる交流信号であり、その周波数は送電装置１００の一次コイルＬ１に流れる電流の周波数に応じて決定される。具体的には、通信部２２０は、送電装置１００の一次コイルＬ１に流れる交流電流の周波数ｆを表す情報を通信部１２０から受信すると、これを受電制御部２１０に出力する。受電制御部２１０は、通信部２２０から周波数ｆの情報が入力されると、この周波数ｆに応じた基本駆動信号Ｓｒを生成し、駆動制御部２４０に出力する。なお、基本駆動信号Ｓｒは、たとえばＭＯＳトランジスタＱ１、Ｑ２にそれぞれ対応する２つの矩形波の組み合わせであり、オン（導通状態）に対応するＨレベルと、オフ（切断状態）に対応するＬレベルとが、周波数ｆで交互に繰り返される。ただし、ＭＯＳトランジスタＱ１とＱ２が同時にオンとならないように、２つの矩形波におけるＨレベルの間には所定の保護期間が設けられる。 In addition to the AC voltage Vg acquired by the voltage acquisition unit 241, the basic drive signal Sr is input to the drive signal generation unit 243 from the power receiving control unit 210. The basic drive signal Sr is an AC signal that is output from the drive control unit 240 to the power conversion unit 250 and is the source of the gate drive signal that controls the switching operation of the MOS transistors Q1 and Q2, and its frequency is the primary of the power transmission device 100. It is determined according to the frequency of the current flowing through the coil L1. Specifically, when the communication unit 220 receives information representing the frequency f of the alternating current flowing through the primary coil L1 of the power transmission device 100 from the communication unit 120, the communication unit 220 outputs this to the power reception control unit 210. When the information of the frequency f is input from the communication unit 220, the power receiving control unit 210 generates a basic drive signal Sr corresponding to the frequency f and outputs the basic drive signal Sr to the drive control unit 240. The basic drive signal Sr is, for example, a combination of two square waves corresponding to MOS transistors Q1 and Q2, respectively, and has an H level corresponding to on (conduction state) and an L level corresponding to off (disconnection state). Is alternately repeated at the frequency f. However, a predetermined protection period is provided between the H levels in the two square waves so that the MOS transistors Q1 and Q2 are not turned on at the same time.

駆動信号生成部２４３は、電圧取得部２４１から入力された交流電圧Ｖｇに基づいて、受電制御部２１０から入力された基本駆動信号Ｓｒの位相を調整し、充電駆動信号Ｓｃを生成する。そして、生成した充電駆動信号Ｓｃをゲート駆動回路２４４に出力する。 The drive signal generation unit 243 adjusts the phase of the basic drive signal Sr input from the power receiving control unit 210 based on the AC voltage Vg input from the voltage acquisition unit 241 to generate the charge drive signal Sc. Then, the generated charge drive signal Sc is output to the gate drive circuit 244.

ゲート駆動回路２４４は、駆動信号生成部２４３から入力された充電駆動信号Ｓｃに基づくゲート駆動信号をＭＯＳトランジスタＱ１、Ｑ２のゲート端子へそれぞれ出力し、ＭＯＳトランジスタＱ１、Ｑ２をそれぞれスイッチング動作させる。これにより、電力変換部２５０において、ＭＯＳトランジスタＱ１、Ｑ２がスイッチング素子としてそれぞれ機能し、一次コイルＬ１から放出された交流磁界に応じて共振回路に流れる交流電流ｉの制御や、交流電力から直流電力への変換が行われる。 The gate drive circuit 244 outputs a gate drive signal based on the charge drive signal Sc input from the drive signal generation unit 243 to the gate terminals of the MOS transistors Q1 and Q2, respectively, and switches the MOS transistors Q1 and Q2, respectively. As a result, in the power conversion unit 250, the MOS transistors Q1 and Q2 function as switching elements, respectively, and control of the AC current i flowing in the resonance circuit according to the AC magnetic field emitted from the primary coil L1 and the DC power from the AC power. Conversion to is done.

本実施形態の受電装置２００は、以上説明したような動作を行うことにより、送電装置１００から無線給電を受けて高圧電池３００を充電することができる。 The power receiving device 200 of the present embodiment can charge the high voltage battery 300 by receiving wireless power supply from the power transmission device 100 by performing the operations as described above.

次に、無線給電システム１を用いた通常充電時の無線給電の流れについて説明する。図３は、本発明の一実施形態に係る無線給電システム１の通常充電時の処理フローを示す図である。受電装置２００、高圧電池３００および負荷４００を搭載した車両が所定の充電位置に駐車されると、無線給電システム１において図３の処理フローが開始される。 Next, the flow of wireless power supply during normal charging using the wireless power supply system 1 will be described. FIG. 3 is a diagram showing a processing flow during normal charging of the wireless power supply system 1 according to the embodiment of the present invention. When the vehicle equipped with the power receiving device 200, the high-voltage battery 300, and the load 400 is parked at a predetermined charging position, the processing flow of FIG. 3 is started in the wireless power supply system 1.

ステップＳ１０では、地上側の送電装置１００から車両側の受電装置２００に対して、充電の問い合わせを行う。ここでは、たとえば送電装置１００の通信部１２０から受電装置２００の通信部２２０へ所定の通信メッセージを送信することにより、充電の問い合わせを行う。 In step S10, a charging inquiry is made from the power transmission device 100 on the ground side to the power receiving device 200 on the vehicle side. Here, for example, a charging inquiry is made by transmitting a predetermined communication message from the communication unit 120 of the power transmission device 100 to the communication unit 220 of the power reception device 200.

ステップＳ２０では、ステップＳ１０で充電の問い合わせを受けた受電装置２００から送電装置１００に対して、充電時における高圧電池３００の許容電流を通知する。このとき受電装置２００は、たとえば予め測定した高圧電池３００の充電状態や劣化状態に基づいて許容電流を決定し、その許容電流の値を示す情報を、通信部２２０から送電装置１００の通信部１２０へ送信する。なお、充電が不要な場合は、その旨を受電装置２００から送電装置１００へ通知してもよい。この場合、ステップＳ３０以降の処理は実行されずに、図３の処理フローが終了する。 In step S20, the power receiving device 200 that received the charging inquiry in step S10 notifies the power transmission device 100 of the permissible current of the high-voltage battery 300 at the time of charging. At this time, the power receiving device 200 determines the permissible current based on, for example, the charged state and the deteriorated state of the high-voltage battery 300 measured in advance, and the information indicating the value of the permissible current is transmitted from the communication unit 220 to the communication unit 120 of the power transmission device 100. Send to. If charging is not required, the power receiving device 200 may notify the power transmitting device 100 to that effect. In this case, the process of step S30 and subsequent steps is not executed, and the process flow of FIG. 3 ends.

ステップＳ３０では、送電装置１００において電流量を決定し、受電装置２００への送電を開始する。このとき送電装置１００は、ステップＳ２０で受電装置２００から通知された許容電流に対応する出力電流値と、自身の定格電流値とを比較し、いずれか小さい方を選択して電流量を決定する。そして、送電制御部１１０により電力変換部１４０を制御して、決定した電流量に応じた交流電流を一次コイルＬ１に流すことで、一次コイルＬ１に交流磁界を発生させて送電を開始する。なお、このときさらに、一次コイルＬ１に流れる交流電流の周波数ｆを表す情報を通信部１２０から受電装置２００の通信部２２０へ送信することで、受電装置２００の受電制御部２１０において、周波数ｆに応じた前述の基本駆動信号Ｓｒを生成できるようにすることが好ましい。あるいは、ステップＳ１０で充電の問い合わせを行う際に、送電装置１００から受電装置２００へ周波数ｆを通知してもよい。 In step S30, the power transmission device 100 determines the amount of current, and power transmission to the power receiving device 200 is started. At this time, the power transmission device 100 compares the output current value corresponding to the allowable current notified from the power receiving device 200 in step S20 with its own rated current value, and selects the smaller one to determine the current amount. .. Then, the power conversion unit 140 is controlled by the power transmission control unit 110, and an alternating current corresponding to the determined current amount is passed through the primary coil L1 to generate an alternating magnetic field in the primary coil L1 and start power transmission. At this time, by further transmitting information representing the frequency f of the alternating current flowing through the primary coil L1 from the communication unit 120 to the communication unit 220 of the power receiving device 200, the power receiving control unit 210 of the power receiving device 200 sets the frequency f. It is preferable to be able to generate the above-mentioned basic drive signal Sr according to the above. Alternatively, when making an inquiry for charging in step S10, the power transmission device 100 may notify the power receiving device 200 of the frequency f.

ステップＳ４０では、受電装置２００において、一次コイルＬ１から放出された交流磁界を受けて二次コイルＬ２を含む共振回路に流れる交流電流ｉに応じて、電力変換部２５０の駆動制御処理を行う。ここでは、駆動制御部２４０の各部において前述のような処理をそれぞれ実施することで、送電装置１００から受電した交流電流に応じた電力変換部２５０の駆動制御を行う。これにより、定電流（ＣＣ）モードで高圧電池３００の充電を実施する。 In step S40, in the power receiving device 200, the drive control process of the power conversion unit 250 is performed according to the alternating current i that receives the alternating magnetic field emitted from the primary coil L1 and flows in the resonant circuit including the secondary coil L2. Here, by carrying out the above-mentioned processing in each unit of the drive control unit 240, the drive control of the power conversion unit 250 according to the alternating current received from the power transmission device 100 is performed. As a result, the high-voltage battery 300 is charged in the constant current (CC) mode.

ステップＳ５０では、受電装置２００において、高圧電池３００の充電状態（ＳＯＣ）が所定の値、たとえば８０％以上になったか否かを判定する。その結果、ＳＯＣが８０％未満であれば、ステップＳ４０の駆動制御処理を繰り返し、ＳＯＣが８０％以上になったら、定電流モードから定電圧（ＣＶ）モードに移行してステップＳ６０に進む。 In step S50, the power receiving device 200 determines whether or not the state of charge (SOC) of the high-voltage battery 300 has reached a predetermined value, for example, 80% or more. As a result, if the SOC is less than 80%, the drive control process of step S40 is repeated, and if the SOC becomes 80% or more, the mode shifts from the constant current mode to the constant voltage (CV) mode and the process proceeds to step S60.

ステップＳ６０では、受電装置２００から送電装置１００に対して、現在の高圧電池３００の充電状態に応じた充電電流を通知する。このとき受電装置２００は、現在の高圧電池３００の充電状態に基づいて、ステップＳ２０で通知した許容電流よりも小さな値で充電電流を決定し、その充電電流の値を示す情報を、通信部２２０から送電装置１００の通信部１２０へ送信する。 In step S60, the power receiving device 200 notifies the power transmitting device 100 of the charging current according to the current charging state of the high-voltage battery 300. At this time, the power receiving device 200 determines the charging current with a value smaller than the allowable current notified in step S20 based on the current charging state of the high-voltage battery 300, and provides information indicating the value of the charging current to the communication unit 220. To the communication unit 120 of the power transmission device 100.

ステップＳ７０では、受電装置２００において、ステップＳ４０と同様の駆動制御処理を行うことにより、定電圧（ＣＶ）モードで高圧電池３００の充電を実施する。 In step S70, the power receiving device 200 charges the high-voltage battery 300 in the constant voltage (CV) mode by performing the same drive control process as in step S40.

ステップＳ８０では、受電装置２００において、高圧電池３００の充電状態（ＳＯＣ）が満充電の１００％に達したか否かを判定する。その結果、ＳＯＣが１００％未満であれば、ステップＳ６０に戻って高圧電池３００の充電を継続し、ＳＯＣが１００％に達したらステップＳ９０に進む。 In step S80, in the power receiving device 200, it is determined whether or not the charged state (SOC) of the high-voltage battery 300 has reached 100% of the full charge. As a result, if the SOC is less than 100%, the process returns to step S60 to continue charging the high-voltage battery 300, and when the SOC reaches 100%, the process proceeds to step S90.

ステップＳ９０では、高圧電池３００の充電を終了する。ここでは、たとえば受電装置２００の通信部２２０から送電装置１００の通信部１２０へ所定の通信メッセージを送信することにより、送電停止を指示する。送電装置１００では、この送電停止指示に応じて一次コイルＬ１への通電を遮断することで、送電を停止する。送電装置１００からの送電が停止されたら、受電装置２００において電力変換部２５０の動作を停止することで、高圧電池３００の充電を終了する。 In step S90, charging of the high-voltage battery 300 is completed. Here, for example, a predetermined communication message is transmitted from the communication unit 220 of the power receiving device 200 to the communication unit 120 of the power transmission device 100 to instruct the power transmission to be stopped. The power transmission device 100 stops power transmission by shutting off the energization of the primary coil L1 in response to the power transmission stop instruction. When the power transmission from the power transmission device 100 is stopped, the power conversion unit 250 is stopped in the power receiving device 200 to end the charging of the high-voltage battery 300.

ステップＳ９０で高圧電池３００の充電を終了したら、図３の処理フローを終了する。これにより、無線給電システム１の無線給電が完了する。 When the charging of the high-voltage battery 300 is completed in step S90, the processing flow of FIG. 3 is completed. As a result, the wireless power supply of the wireless power supply system 1 is completed.

次に、高圧電池３００が電欠状態に陥った場合の無線給電システム１の動作について説明する。高圧電池３００や低圧電池６１６は、負荷４００や補機類への電力供給を続けて残容量が低下すると、それ以上は放電できない状態に陥る。このような状態は電欠状態と呼ばれる。また、高圧電池３００や低圧電池６１６は未使用状態でも自己放電により残容量が徐々に低下するため、高圧電池３００や低圧電池６１６を長期間に渡って充電せずに放置したときにも、電欠状態に陥る場合がある。 Next, the operation of the wireless power supply system 1 when the high-voltage battery 300 falls into a power shortage state will be described. When the high-voltage battery 300 and the low-voltage battery 616 continue to supply electric power to the load 400 and accessories and the remaining capacity decreases, the high-voltage battery 300 and the low-voltage battery 616 fall into a state in which they cannot be discharged any more. Such a state is called a power shortage state. Further, since the remaining capacity of the high-voltage battery 300 and the low-voltage battery 616 gradually decreases due to self-discharge even in an unused state, even when the high-voltage battery 300 and the low-voltage battery 616 are left uncharged for a long period of time, electricity is generated. You may fall into a missing state.

低圧電池６１６が電欠状態に陥った場合、低圧電池６１６を新品に交換するか、高圧電池３００が使用可能であれば、高圧電池３００からの直流電力をコンバータ６１５で降圧して低圧電池６１６を充電することで、低圧電池６１６を使用可能な状態へと復帰させることができる。一方、高圧電池３００が電欠状態に陥った場合、一般的に高圧電池３００は容易に交換可能な構造とはなっていないため、高圧電池３００を使用可能な状態へと復帰させるには、無線給電システム１を用いて送電装置１００から受電装置２００へと無線給電を行い、高圧電池３００を充電する必要がある。 When the low-voltage battery 616 falls into a power shortage state, the low-voltage battery 616 is replaced with a new one, or if the high-voltage battery 300 can be used, the DC power from the high-voltage battery 300 is stepped down by the converter 615 to reduce the low-voltage battery 616. By charging, the low-voltage battery 616 can be returned to a usable state. On the other hand, when the high-voltage battery 300 falls into a power shortage state, the high-voltage battery 300 generally does not have a structure that can be easily replaced. Therefore, in order to return the high-voltage battery 300 to a usable state, wireless It is necessary to wirelessly supply power from the power transmission device 100 to the power reception device 200 using the power supply system 1 to charge the high-voltage battery 300.

ここで、高圧電池３００が電欠状態に陥ったままで長期間放置されると、通常よりも放電が進んだ過放電状態となり、通常時よりも低い電流での充電が必要になることがある。また、過放電状態から放電がさらに進むと電池が劣化し、充電が不可能となることもある。このように、電欠状態に陥った高圧電池３００を充電する際には、その電池状態を考慮して充電制御を行う必要がある。本実施形態の無線給電システム１は、こうした電欠状態にある高圧電池３００の電池状態に応じた充電制御を、主に電池監視装置５００を用いて実現している。すなわち、電池監視装置５００は、電欠状態の高圧電池３００の充電を制御する充電制御装置として機能する。 Here, if the high-voltage battery 300 is left in a power-deficient state for a long period of time, it becomes an over-discharged state in which the discharge is advanced more than usual, and it may be necessary to charge the battery with a current lower than the normal state. In addition, if the battery is further discharged from the over-discharged state, the battery may deteriorate and charging may not be possible. As described above, when charging the high-voltage battery 300 that has fallen into a power shortage state, it is necessary to perform charge control in consideration of the battery state. The wireless power supply system 1 of the present embodiment realizes charge control according to the battery state of the high-voltage battery 300 in such a power-deficient state mainly by using the battery monitoring device 500. That is, the battery monitoring device 500 functions as a charge control device that controls the charging of the high-pressure battery 300 in the power-deficient state.

以下では図４、図５を参照して、電欠状態に陥った高圧電池３００の充電制御について説明する。図４は、本発明の一実施形態に係る電池監視装置５００の機能ブロック図である。図５は、高圧電池３００を電欠状態から復帰させる際の充電制御の処理フローの一例を示す図である。 Hereinafter, charging control of the high-voltage battery 300 that has fallen into a power shortage state will be described with reference to FIGS. 4 and 5. FIG. 4 is a functional block diagram of the battery monitoring device 500 according to the embodiment of the present invention. FIG. 5 is a diagram showing an example of a charge control processing flow when the high-voltage battery 300 is restored from the power shortage state.

なお、低圧電池６１６が使用可能であり、かつコンバータ６１５が低圧電池６１６から出力された直流電力を昇圧可能なものである場合は、低圧電池６１６を用いて高圧電池３００を充電することにより、電欠状態にある高圧電池３００を使用可能な状態へと復帰させることも考えられる。しかしながら、以下に説明する充電制御では、送電装置１００から受電装置２００へと無線給電を行うことで高圧電池３００の充電を行うことを前提としており、低圧電池６１６を用いて高圧電池３００を充電する場合については除外する。 If the low-voltage battery 616 can be used and the converter 615 can boost the DC power output from the low-voltage battery 616, the low-voltage battery 616 can be used to charge the high-voltage battery 300 to generate electricity. It is also conceivable to return the missing high-voltage battery 300 to a usable state. However, in the charge control described below, it is premised that the high-voltage battery 300 is charged by wirelessly supplying power from the power transmission device 100 to the power receiving device 200, and the high-voltage battery 300 is charged using the low-voltage battery 616. Exclude cases.

図４の機能ブロック図は、電欠状態に陥った高圧電池３００の充電制御を行うための電池監視装置５００の機能ブロックを示している。図４に示すように、電池監視装置５００は、演算処理部５１０、セル電圧計測部５２０、絶縁診断部５３０、記録部５４０および出力部５５０の各機能ブロックを有する。演算処理部５１０は、たとえばＣＰＵにおいて所定のプログラムを実行することで実現され、電池状態判定部５１１および充電指示部５１２を含む。また、セル電圧計測部５２０、絶縁診断部５３０および出力部５５０は、それぞれ任意のハードウェア構成を用いて実現され、記録部５４０は、たとえばフラッシュメモリ等の不揮発型のメモリを用いて実現される。 The functional block diagram of FIG. 4 shows a functional block of a battery monitoring device 500 for controlling charging of a high-voltage battery 300 that has fallen into a power shortage state. As shown in FIG. 4, the battery monitoring device 500 has each functional block of the arithmetic processing unit 510, the cell voltage measurement unit 520, the insulation diagnosis unit 530, the recording unit 540, and the output unit 550. The arithmetic processing unit 510 is realized by executing a predetermined program in, for example, a CPU, and includes a battery state determination unit 511 and a charging instruction unit 512. Further, the cell voltage measurement unit 520, the insulation diagnosis unit 530, and the output unit 550 are each realized by using an arbitrary hardware configuration, and the recording unit 540 is realized by using a non-volatile memory such as a flash memory. ..

セル電圧計測部５２０は、高圧電池３００の電圧を計測し、その計測結果を演算処理部５１０へ出力する。セル電圧計測部５２０は、高圧電池３００の電圧を計測する際には、高圧電池３００を構成する複数の電池セルの各々についてセル電圧の計測を行う。そして、計測した各セル電圧を演算処理部５１０へ出力する。 The cell voltage measuring unit 520 measures the voltage of the high-voltage battery 300 and outputs the measurement result to the arithmetic processing unit 510. When measuring the voltage of the high-voltage battery 300, the cell voltage measuring unit 520 measures the cell voltage for each of the plurality of battery cells constituting the high-voltage battery 300. Then, each measured cell voltage is output to the arithmetic processing unit 510.

絶縁診断部５３０は、演算処理部５１０の指示に応じて、無線給電システム１における車両側の高圧系統の絶縁性を診断する。絶縁診断部５３０が絶縁性の診断を行う車両側の高圧系統とは、リレー６１１〜６１４を介して高圧電池３００に接続される無線給電システム１の各部分であり、たとえば電力変換部２５０、負荷４００、コンバータ６１５や、これらの間の配線などを含む。具体的には、たとえば電力変換部２５０とリレー６１１の間の配線や、負荷４００とリレー６１３、６１４の間を接続している配線に対して、所定のパルス信号を入力し、このときの当該配線とフレームグランドＦＧ間のインピーダンスを計測する。その結果、インピーダンスが無限大のままで変化しなければ、フレームグランドＦＧに対して車両側の高圧系統の絶縁性が確保されていると判断する。一方、パルス信号の入力に応じてインピーダンスが変化する場合は、車両側の高圧系統からフレームグランドＦＧへのリークが生じており、車両側の高圧系統の絶縁性が確保されていないと判断する。 The insulation diagnosis unit 530 diagnoses the insulation property of the high-pressure system on the vehicle side in the wireless power supply system 1 in response to the instruction of the arithmetic processing unit 510. The vehicle-side high-voltage system in which the insulation diagnosis unit 530 diagnoses the insulation property is each part of the wireless power supply system 1 connected to the high-voltage battery 300 via the relays 611 to 614. For example, the power conversion unit 250 and the load. Includes 400, converter 615, wiring between them, and the like. Specifically, for example, a predetermined pulse signal is input to the wiring between the power conversion unit 250 and the relay 611 and the wiring connecting the load 400 and the relays 613 and 614, and the relevant signal is input at this time. Measure the impedance between the wiring and the frame ground FG. As a result, if the impedance remains infinite and does not change, it is determined that the insulation of the high-pressure system on the vehicle side is secured with respect to the frame ground FG. On the other hand, when the impedance changes in response to the input of the pulse signal, it is determined that a leak has occurred from the high-voltage system on the vehicle side to the frame ground FG, and the insulation of the high-voltage system on the vehicle side is not ensured.

演算処理部５１０において、電池状態判定部５１１は、セル電圧計測部５２０による高圧電池３００の電圧の計測結果、すなわち各セル電圧の計測結果に基づいて、充電前の高圧電池３００の状態（電池状態）を判定する。このとき電池状態判定部５１１は、各セル電圧の計測結果により、電欠状態に陥った充電前の高圧電池３００が劣化状態、過放電状態、通常電欠状態のいずれの電池状態であるかを判定する。なお、電池状態判定部５１１による具体的な電池状態の判定方法については、後で図５の処理フローを参照して説明する。 In the arithmetic processing unit 510, the battery state determination unit 511 determines the state of the high-voltage battery 300 before charging (battery state) based on the measurement result of the voltage of the high-voltage battery 300 by the cell voltage measurement unit 520, that is, the measurement result of each cell voltage. ) Is determined. At this time, the battery state determination unit 511 determines whether the high-voltage battery 300 before charging, which has fallen into the power shortage state, is in the deteriorated state, the over-discharged state, or the normal power shortage state, based on the measurement result of each cell voltage. judge. A specific method for determining the battery status by the battery status determining unit 511 will be described later with reference to the processing flow of FIG.

演算処理部５１０において、充電指示部５１２は、電池状態判定部５１１による電池状態の判定結果に基づいて、高圧電池３００の充電方法を切り替える。このとき充電指示部５１２は、前述の３種類の電池状態、すなわち劣化状態、過放電状態、通常電欠状態のそれぞれについて、互いに異なる方法により高圧電池３００の充電を行うように、受電装置２００に対して充電指示を行う。充電指示部５１２からの充電指示は、出力部５５０により受電装置２００へ出力される。 In the arithmetic processing unit 510, the charging instruction unit 512 switches the charging method of the high-voltage battery 300 based on the battery state determination result by the battery state determination unit 511. At this time, the charging instruction unit 512 causes the power receiving device 200 to charge the high-voltage battery 300 by different methods for each of the above-mentioned three types of battery states, that is, a deteriorated state, an over-discharged state, and a normal power shortage state. A charging instruction is given to the battery. The charging instruction from the charging instruction unit 512 is output to the power receiving device 200 by the output unit 550.

記録部５４０は、演算処理部５１０の制御に応じて様々な情報を記録する。記録部５４０に記録される情報には、セル電圧計測部５２０による高圧電池３００の電圧計測結果などが含まれる。記録部５４０に記録された情報は、必要に応じて演算処理部５１０により読み出され、演算処理部５１０が行う処理や演算において利用される。 The recording unit 540 records various information according to the control of the arithmetic processing unit 510. The information recorded in the recording unit 540 includes the voltage measurement result of the high voltage battery 300 by the cell voltage measuring unit 520 and the like. The information recorded in the recording unit 540 is read out by the arithmetic processing unit 510 as needed, and is used in the processing and arithmetic performed by the arithmetic processing unit 510.

次に、図５のフローチャートに従って、電欠状態に陥った高圧電池３００の充電制御の流れについて説明する。 Next, the flow of charge control of the high-voltage battery 300 that has fallen into a power shortage state will be described with reference to the flowchart of FIG.

ステップＳ１１０では、高圧電池３００が電欠状態に陥ったか否かを判定する。ここでは、たとえばセル電圧計測部５２０により高圧電池３００の電圧を計測し、計測した電圧が所定値未満であれば、高圧電池３００が電欠状態に陥ったと判定する。このとき、高圧電池３００の電圧から高圧電池３００のＳＯＣを算出し、ＳＯＣが所定値未満となったときに高圧電池３００が電欠状態に陥ったと判定してもよい。ステップＳ１１０で高圧電池３００が電欠状態に陥ったと判定したら、次のステップＳ１２０に処理を進める。 In step S110, it is determined whether or not the high-voltage battery 300 has fallen into a power shortage state. Here, for example, the cell voltage measuring unit 520 measures the voltage of the high-voltage battery 300, and if the measured voltage is less than a predetermined value, it is determined that the high-voltage battery 300 has fallen into a power shortage state. At this time, the SOC of the high-voltage battery 300 may be calculated from the voltage of the high-voltage battery 300, and it may be determined that the high-voltage battery 300 has fallen into a power shortage state when the SOC becomes less than a predetermined value. If it is determined in step S110 that the high-voltage battery 300 has fallen into a power shortage state, the process proceeds to the next step S120.

ステップＳ１２０では、リレー６１１〜６１４を全てオフにし、高圧電池３００を電力変換部２５０および負荷４００から電気的に切断する。ここでは、たとえば電池監視装置５００の演算処理部５１０の処理により、リレー６１１〜６１４を全てオフにする指令を出力部５５０から不図示の車両制御装置へ出力することで、リレー６１１〜６１４をオフに切り替える。 In step S120, all relays 611 to 614 are turned off, and the high voltage battery 300 is electrically disconnected from the power conversion unit 250 and the load 400. Here, for example, the relays 611 to 614 are turned off by outputting a command for turning off all the relays 611 to 614 from the output unit 550 to a vehicle control device (not shown) by processing of the arithmetic processing unit 510 of the battery monitoring device 500. Switch to.

ステップＳ１３０では、セル電圧計測部５２０により、高圧電池３００の各セル電圧を計測する。このときには、ステップＳ１２０でリレー６１１〜６１４がオフにされているため、高圧電池３００に電流が流れていない。したがって、ステップＳ１３０において計測される各セル電圧は、高圧電池３００が電欠状態に陥ったときの各電池セルのＯＣＶ（Open Circuit Voltage）を表している。ステップＳ１３０で高圧電池３００の各セル電圧を計測したら、その計測結果を記録部５４０に記録してステップＳ１４０に進む。 In step S130, the cell voltage measuring unit 520 measures each cell voltage of the high-voltage battery 300. At this time, since the relays 611 to 614 are turned off in step S120, no current is flowing through the high-voltage battery 300. Therefore, each cell voltage measured in step S130 represents the OCV (Open Circuit Voltage) of each battery cell when the high-voltage battery 300 falls into a power shortage state. After measuring the voltage of each cell of the high-voltage battery 300 in step S130, the measurement result is recorded in the recording unit 540 and the process proceeds to step S140.

ステップＳ１４０では、高圧電池３００の電欠状態からの復帰を開始するか否かを判定する。ここではたとえば、高圧電池３００とともに電欠状態に陥った低圧電池６１６が充電済みの新品に交換され、かつ受電装置２００が送電装置１００からの無線給電を受電可能な所定の充電位置に車両が駐車されたときに、高圧電池３００の電欠状態からの復帰を開始すると判定する。ステップＳ１４０で高圧電池３００の電欠状態からの復帰を開始すると判定したら、次のステップＳ１５０に処理を進める。 In step S140, it is determined whether or not to start the recovery from the power shortage state of the high voltage battery 300. Here, for example, the vehicle is parked at a predetermined charging position in which the low-voltage battery 616, which has fallen into a power shortage state together with the high-voltage battery 300, is replaced with a new charged battery, and the power receiving device 200 can receive wireless power from the power transmission device 100. When this is done, it is determined that the recovery from the power shortage state of the high-voltage battery 300 is started. When it is determined in step S140 that the recovery from the power shortage state of the high-voltage battery 300 is started, the process proceeds to the next step S150.

ステップＳ１５０では、セル電圧計測部５２０により、高圧電池３００の各セル電圧を計測する。このときもステップＳ１３０と同様に、ステップＳ１２０でリレー６１１〜６１４がオフにされているため、高圧電池３００に電流が流れていない。したがって、ステップＳ１５０において計測される各セル電圧は、現在、すなわち電欠状態からの復帰開始時の各電池セルのＯＣＶを表している。 In step S150, the cell voltage measuring unit 520 measures each cell voltage of the high-voltage battery 300. At this time as well, since the relays 611 to 614 are turned off in step S120 as in step S130, no current is flowing through the high voltage battery 300. Therefore, each cell voltage measured in step S150 represents the OCV of each battery cell at the present time, that is, at the start of recovery from the power shortage state.

ステップＳ１６０では、電池状態判定部５１１により、高圧電池３００における劣化セルの有無を判定する。ここでは、ステップＳ１３０で記録部５４０に記録された高圧電池３００が電欠状態に陥ったときの各電池セルのＯＣＶと、ステップＳ１５０で計測した現在の各電池セルのＯＣＶとを、電池セルごとに比較する。その結果、いずれか少なくとも一つの電池セルにおけるこれらのＯＣＶの差が所定の劣化判定値、たとえば０．５Ｖ以上であれば、長期間の放置によって当該電池セルに電極の組成変化、膨潤、腐食等の充電不可能な劣化が生じていると判断し、当該電池セルを劣化セルと判定する。ただし、ＯＣＶの差が劣化判定値未満であっても、他の電池セルと比べてＯＣＶの差が大きく乖離している電池セルがある場合は、当該電池セルを劣化セルと判定してもよい。ステップＳ１６０で劣化セルありと判定した場合は、高圧電池３００が劣化状態にあると判断してステップＳ２２０に進み、劣化セルなしと判定した場合はステップＳ１７０に進む。 In step S160, the battery status determination unit 511 determines the presence or absence of deteriorated cells in the high-voltage battery 300. Here, the OCV of each battery cell when the high-voltage battery 300 recorded in the recording unit 540 in step S130 falls into a power shortage state and the OCV of each current battery cell measured in step S150 are set for each battery cell. Compare to. As a result, if the difference between these OCVs in any one of the battery cells is a predetermined deterioration determination value, for example, 0.5 V or more, the battery cells are left for a long period of time to change the composition of electrodes, swell, corrode, etc. It is determined that the unchargeable deterioration of the battery cell has occurred, and the battery cell is determined to be a deteriorated cell. However, even if the difference in OCV is less than the deterioration determination value, if there is a battery cell in which the difference in OCV is significantly different from that of other battery cells, the battery cell may be determined as a deteriorated cell. .. If it is determined in step S160 that there is a deteriorated cell, it is determined that the high-voltage battery 300 is in a deteriorated state, and the process proceeds to step S220. If it is determined that there is no deteriorated cell, the process proceeds to step S170.

ステップＳ１７０では、電池状態判定部５１１により、高圧電池３００における過放電セルの有無を判定する。ここでは、ステップＳ１５０で計測した現在の各電池セルのＯＣＶを所定の過放電判定値、たとえば３Ｖと比較する。その結果、いずれか少なくとも一つの電池セルにおけるＯＣＶの値が過放電判定値未満であれば、長期間の放置によって当該電池セルに充放電不可能な劣化は生じていないものの、当該電池セルは過放電状態にあるものと判断し、当該電池セルを過放電セルと判定する。ステップＳ１７０で過放電セルありと判定した場合は、高圧電池３００が過放電状態にあると判断してステップＳ１８０に進み、過放電セルなしと判定した場合は、高圧電池３００が通常電欠状態にあると判断してステップＳ２４０に進む。 In step S170, the battery status determination unit 511 determines the presence or absence of an over-discharged cell in the high-voltage battery 300. Here, the current OCV of each battery cell measured in step S150 is compared with a predetermined over-discharge determination value, for example, 3V. As a result, if the OCV value in any one of the battery cells is less than the over-discharge determination value, the battery cell is not deteriorated so that it cannot be charged or discharged by being left for a long period of time, but the battery cell is excessive. It is determined that the battery cell is in a discharged state, and the battery cell is determined to be an over-discharged cell. If it is determined in step S170 that there is an over-discharge cell, it is determined that the high-voltage battery 300 is in an over-discharged state, and the process proceeds to step S180. If it is determined that there is no over-discharge cell, the high-voltage battery 300 is in a normal power shortage state. It is determined that there is, and the process proceeds to step S240.

ステップＳ１７０で高圧電池３００が過放電状態にあると判定してステップＳ１８０に進んだ場合、ステップＳ１８０では、電池状態判定部５１１により、高圧電池３００が充電可能であるか否かを判定する。ここでは、ステップＳ１７０で判定した過放電セルのＯＣＶを所定の充電可能判定値、たとえば２Ｖと比較する。その結果、当該過放電セルのＯＣＶの値が充電可能判定値以上であれば、高圧電池３００が充電可能と判定してステップＳ１９０に進み、充電可能判定値未満であれば、高圧電池３００が充電不可能と判定してステップＳ２２０に進む。なお、上記の充電可能判定値は、２Ｖ以外にも高圧電池３００の特性に応じて任意の値を設定可能であるが、少なくともステップＳ１７０の判定で用いられる過放電判定値よりも低い値が設定される。 When it is determined in step S170 that the high-voltage battery 300 is in an over-discharged state and the process proceeds to step S180, in step S180, the battery state determination unit 511 determines whether or not the high-voltage battery 300 can be charged. Here, the OCV of the over-discharged cell determined in step S170 is compared with a predetermined chargeable determination value, for example, 2V. As a result, if the OCV value of the over-discharge cell is equal to or higher than the chargeable determination value, it is determined that the high-voltage battery 300 can be charged, and the process proceeds to step S190. It is determined that it is impossible, and the process proceeds to step S220. The above chargeable determination value can be set to any value other than 2V according to the characteristics of the high-voltage battery 300, but at least a value lower than the over-discharge determination value used in the determination in step S170 is set. Will be done.

ステップＳ１７０で高圧電池３００が過放電状態にあると判定し、ステップＳ１８０で高圧電池３００が充電可能と判定してステップＳ１９０に進んだ場合、ステップＳ１９０では、絶縁診断部５３０により、無線給電システム１における車両側の高圧系統の絶縁性診断を実施する。その結果、車両側の高圧系統の絶縁性が確認できた場合は、ステップＳ２００で高圧電池３００の充電側にあるリレー６１１、６１２をオフからオンに切り替えた後、ステップＳ２１０では充電指示部５１２により、通常充電時よりも低い所定の充電電流による低電流充電開始指示を受電装置２００に送信する。ステップＳ２１０で低電流充電開始指示を受電装置２００に送信したら、図５の処理フローを終了する。なお、ステップＳ１９０で車両側の高圧系統の絶縁性が確認できなかった場合は、ステップＳ２００以降の処理を実施せずに図５の処理フローを終了する。 When it is determined in step S170 that the high-voltage battery 300 is in an over-discharged state, and in step S180 it is determined that the high-voltage battery 300 can be charged and the process proceeds to step S190, in step S190, the insulation diagnosis unit 530 determines that the wireless power supply system 1 Perform the insulation diagnosis of the high-voltage system on the vehicle side in. As a result, when the insulation of the high-pressure system on the vehicle side can be confirmed, the relays 611 and 612 on the charging side of the high-pressure battery 300 are switched from off to on in step S200, and then in step S210, the charging indicator 512 , A low current charging start instruction with a predetermined charging current lower than that during normal charging is transmitted to the power receiving device 200. When the low current charging start instruction is transmitted to the power receiving device 200 in step S210, the processing flow of FIG. 5 ends. If the insulation of the high-pressure system on the vehicle side cannot be confirmed in step S190, the processing flow of FIG. 5 is terminated without performing the processing after step S200.

ステップＳ２１０で電池監視装置５００から送信された低電流充電開始指示を受電装置２００が受信すると、受電装置２００は送電装置１００に対して、通常時よりも一次コイルＬ１に流れる交流電流を低下させるように指示する。その後は、図３の処理フローで説明した通常充電時と同様の手順により、送電装置１００からの無線給電を受けて高圧電池３００の充電を行う。これにより、電欠状態にある高圧電池３００が充電されて電欠状態から復帰することができる。 When the power receiving device 200 receives the low current charging start instruction transmitted from the battery monitoring device 500 in step S210, the power receiving device 200 causes the power transmission device 100 to reduce the alternating current flowing through the primary coil L1 as compared with the normal state. Instruct. After that, the high-voltage battery 300 is charged by receiving wireless power from the power transmission device 100 according to the same procedure as during normal charging described in the processing flow of FIG. As a result, the high-voltage battery 300 in the power shortage state can be charged and recovered from the power shortage state.

ステップＳ１６０で高圧電池３００が劣化状態にあると判定してステップＳ２２０に進んだ場合、または、ステップＳ１７０で高圧電池３００が過放電状態にあると判定し、ステップＳ１８０で高圧電池３００が充電不可能と判定してステップＳ２２０に進んだ場合、ステップＳ２２０では、ステップＳ１２０でオフにしたリレー６１１〜６１４をそのままオフ状態に維持する。続くステップＳ２３０では、充電指示部５１２により、高圧電池３００の充電を禁止する充電停止指示と、その要因を表す要因情報とを受電装置２００に送信する。要因情報にはたとえば、高圧電池３００の電池状態に対する判定結果が劣化状態と過放電状態のいずれであるかを示す情報や、高圧電池３００における劣化セルまたは過放電セルの個数を示す情報などを含めることができる。ステップＳ２３０で充電停止指示および要因情報を受電装置２００に送信したら、図５の処理フローを終了する。 When it is determined in step S160 that the high-voltage battery 300 is in a deteriorated state and the process proceeds to step S220, or in step S170 it is determined that the high-voltage battery 300 is in an over-discharged state and the high-voltage battery 300 cannot be charged in step S180. When the determination is made and the process proceeds to step S220, in step S220, the relays 611 to 614 that were turned off in step S120 are maintained in the off state as they are. In the following step S230, the charging instruction unit 512 transmits a charging stop instruction for prohibiting charging of the high-voltage battery 300 and factor information indicating the factor to the power receiving device 200. The factor information includes, for example, information indicating whether the determination result for the battery state of the high-voltage battery 300 is a deteriorated state or an over-discharged state, information indicating the number of deteriorated cells or over-discharged cells in the high-voltage battery 300, and the like. be able to. When the charging stop instruction and the factor information are transmitted to the power receiving device 200 in step S230, the processing flow of FIG. 5 ends.

ステップＳ２３０で電池監視装置５００から送信された充電停止指示を受電装置２００が受信すると、受電装置２００は送電装置１００に対して、一次コイルＬ１からの交流磁界の放出を実施しないように指示する。これにより、電欠状態の高圧電池３００が劣化状態または充電不可能な過放電状態にある場合は、高圧電池３００の充電を禁止することができる。 When the power receiving device 200 receives the charging stop instruction transmitted from the battery monitoring device 500 in step S230, the power receiving device 200 instructs the power transmitting device 100 not to emit the alternating magnetic field from the primary coil L1. As a result, when the high-voltage battery 300 in the power shortage state is in a deteriorated state or an over-discharged state in which it cannot be charged, charging of the high-voltage battery 300 can be prohibited.

ステップＳ１７０で高圧電池３００が通常電欠状態にあると判定してステップＳ２４０に進んだ場合、ステップＳ２４０では、絶縁診断部５３０により、無線給電システム１における車両側の高圧系統の絶縁性診断を実施する。その結果、車両側の高圧系統の絶縁性が確認できた場合は、ステップＳ２５０で高圧電池３００の充電側にあるリレー６１１、６１２をオフからオンに切り替えた後、ステップＳ２６０では充電指示部５１２により、通常充電時と同じ充電電流による通常充電開始指示を受電装置２００に送信する。ステップＳ２６０で通常充電開始指示を受電装置２００に送信したら、図５の処理フローを終了する。なお、ステップＳ２４０で車両側の高圧系統の絶縁性が確認できなかった場合は、ステップＳ２５０以降の処理を実施せずに図５の処理フローを終了する。 When it is determined in step S170 that the high-voltage battery 300 is normally out of power and the process proceeds to step S240, in step S240, the insulation diagnosis unit 530 performs an insulation diagnosis of the high-voltage system on the vehicle side in the wireless power supply system 1. To do. As a result, when the insulation of the high-pressure system on the vehicle side can be confirmed, the relays 611 and 612 on the charging side of the high-pressure battery 300 are switched from off to on in step S250, and then in step S260, the charging indicator 512 , A normal charging start instruction with the same charging current as during normal charging is transmitted to the power receiving device 200. When the normal charging start instruction is transmitted to the power receiving device 200 in step S260, the processing flow of FIG. 5 ends. If the insulation of the high-pressure system on the vehicle side cannot be confirmed in step S240, the processing flow of FIG. 5 is terminated without performing the processing after step S250.

ステップＳ２６０で電池監視装置５００から送信された通常充電開始指示を受電装置２００が受信すると、受電装置２００は送電装置１００に対して、通常時と同様の交流電流を一次コイルＬ１に流すように指示する。その後は、図３の処理フローで説明した通常充電時と同様の手順により、送電装置１００からの無線給電を受けて高圧電池３００の充電を行う。これにより、電欠状態にある高圧電池３００が充電されて電欠状態から復帰することができる。 When the power receiving device 200 receives the normal charging start instruction transmitted from the battery monitoring device 500 in step S260, the power receiving device 200 instructs the power transmission device 100 to pass an alternating current similar to that in the normal state to the primary coil L1. To do. After that, the high-voltage battery 300 is charged by receiving wireless power from the power transmission device 100 according to the same procedure as during normal charging described in the processing flow of FIG. As a result, the high-voltage battery 300 in the power shortage state can be charged and recovered from the power shortage state.

以上説明した本発明の一実施形態によれば、以下の作用効果を奏する。 According to one embodiment of the present invention described above, the following effects are exhibited.

（１）電池監視装置５００は、電動車両に搭載された高圧電池３００の充電を制御する充電制御装置として機能する。電池監視装置５００は、高圧電池３００の電圧を計測するセル電圧計測部５２０と、セル電圧計測部５２０による高圧電池３００の電圧の計測結果に基づいて、高圧電池３００の状態に対応する電池状態が第１の状態（劣化状態）、第２の状態（過放電状態）または第３の状態（通常電欠状態）のいずれであるかを判定する電池状態判定部５１１と、電池状態判定部５１１による電池状態の判定結果に基づいて、高圧電池３００の充電方法を切り替える充電指示部５１２と、を備える。このようにしたので、電欠状態に陥った高圧電池３００を充電する際に、電池状態に応じた適切な充電制御を行うことができる。 (1) The battery monitoring device 500 functions as a charge control device that controls charging of the high-voltage battery 300 mounted on the electric vehicle. The battery monitoring device 500 has a battery state corresponding to the state of the high-pressure battery 300 based on the cell voltage measuring unit 520 that measures the voltage of the high-pressure battery 300 and the measurement result of the voltage of the high-pressure battery 300 by the cell voltage measuring unit 520. The battery state determination unit 511 and the battery state determination unit 511 determine whether the state is the first state (deterioration state), the second state (over-discharged state), or the third state (normal power shortage state). A charging instruction unit 512 that switches the charging method of the high-voltage battery 300 based on the determination result of the battery state is provided. As a result, when charging the high-voltage battery 300 that has fallen into a power shortage state, it is possible to perform appropriate charge control according to the battery state.

（２）電池監視装置５００は、高圧電池３００が電欠状態になったときにセル電圧計測部５２０により計測された高圧電池３００の電圧を記録する（ステップＳ１３０）記録部５４０をさらに備える。電池状態判定部５１１は、記録部５４０に記録された高圧電池３００の電圧と現在の高圧電池３００の電圧との差が所定の劣化判定値以上である場合、電池状態が第１の状態（劣化状態）であると判定する（ステップＳ１６０：Ｙｅｓ）。充電指示部５１２は、電池状態が第１の状態であると電池状態判定部５１１が判定した場合、高圧電池３００の充電を禁止する（ステップＳ２２０、Ｓ２３０）。このようにしたので、高圧電池３００が充電に適さない電池状態にある場合は、危険な充電が行われるのを防止することができる。 (2) The battery monitoring device 500 further includes a recording unit 540 that records the voltage of the high-voltage battery 300 measured by the cell voltage measuring unit 520 when the high-voltage battery 300 is in a power shortage state (step S130). When the difference between the voltage of the high-voltage battery 300 recorded in the recording unit 540 and the current voltage of the high-voltage battery 300 is equal to or greater than a predetermined deterioration determination value, the battery state determination unit 511 sets the battery state to the first state (deterioration). State) (step S160: Yes). When the battery state determination unit 511 determines that the battery state is the first state, the charge instruction unit 512 prohibits charging of the high-voltage battery 300 (steps S220 and S230). As a result, when the high-voltage battery 300 is in a battery state unsuitable for charging, it is possible to prevent dangerous charging from being performed.

（３）高圧電池３００は、複数の電池セルを組み合わせて構成されている。セル電圧計測部５２０は、ステップＳ１３０、Ｓ１５０において、複数の電池セルの各々の電圧を計測する。電池状態判定部５１１は、ステップＳ１６０において、複数の電池セルのうち少なくとも一つの電池セルについて記録部５４０に記録された電圧と現在の電圧との差が劣化判定値以上である場合、電池状態が第１の状態（劣化状態）であると判定する。このようにしたので、複数の電池セルを組み合わせて構成された高圧電池３００について、電池状態が第１の状態に該当するか否かを適切に判定することができる。 (3) The high-voltage battery 300 is configured by combining a plurality of battery cells. The cell voltage measuring unit 520 measures the voltage of each of the plurality of battery cells in steps S130 and S150. In step S160, when the difference between the voltage recorded in the recording unit 540 and the current voltage for at least one battery cell among the plurality of battery cells is equal to or greater than the deterioration determination value, the battery status determination unit 511 determines the battery status. It is determined that it is the first state (deteriorated state). As a result, it is possible to appropriately determine whether or not the battery state of the high-voltage battery 300 configured by combining a plurality of battery cells corresponds to the first state.

（４）電池状態判定部５１１は、高圧電池３００の電圧が所定の過放電判定値未満である場合、電池状態が第２の状態（過放電状態）であると判定する（ステップＳ１７０：Ｙｅｓ）。充電指示部５１２は、電池状態が第２の状態であると電池状態判定部５１１が判定した場合、高圧電池３００の充電を制限する（ステップＳ１８０〜Ｓ２３０）。具体的には、電池状態判定部５１１は、電池状態が第２の状態であると判定した場合、高圧電池３００の電圧が過放電判定値よりも低い所定の充電可能判定値以上であるか否かを判定する（ステップＳ１８０）。充電指示部５１２は、電池状態が第２の状態であり、かつ高圧電池３００の電圧が充電可能判定値以上であると電池状態判定部５１１が判定した場合（ステップＳ１８０：Ｙｅｓ）には、通常充電時の電流よりも小さい所定の低電流で高圧電池３００を充電させる（ステップＳ２１０）。一方、電池状態が第２の状態であり、かつ高圧電池３００の電圧が充電可能判定値未満であると電池状態判定部５１１が判定した場合（ステップＳ１８０：Ｎｏ）には、高圧電池３００の充電を禁止する（ステップＳ２２０、Ｓ２３０）。このようにしたので、高圧電池３００の電池状態に応じて、充電可能な場合は適切な充電電流により充電を行い、充電不可能な場合は危険な充電が行われるのを防止することができる。 (4) When the voltage of the high-voltage battery 300 is less than a predetermined over-discharge determination value, the battery state determination unit 511 determines that the battery state is the second state (over-discharge state) (step S170: Yes). .. When the battery state determination unit 511 determines that the battery state is the second state, the charge instruction unit 512 limits the charging of the high-voltage battery 300 (steps S180 to S230). Specifically, when the battery state determination unit 511 determines that the battery state is the second state, whether or not the voltage of the high-voltage battery 300 is equal to or higher than a predetermined rechargeable determination value lower than the over-discharge determination value. (Step S180). When the battery state determination unit 512 determines that the battery state is the second state and the voltage of the high-voltage battery 300 is equal to or higher than the chargeable determination value (step S180: Yes), the charge instruction unit 512 is usually used. The high-voltage battery 300 is charged with a predetermined low current smaller than the current during charging (step S210). On the other hand, when the battery state is the second state and the battery state determination unit 511 determines that the voltage of the high-voltage battery 300 is less than the rechargeable determination value (step S180: No), the high-voltage battery 300 is charged. (Steps S220, S230). Therefore, depending on the battery state of the high-voltage battery 300, it is possible to charge the high-voltage battery 300 with an appropriate charging current when it can be charged, and prevent dangerous charging when it cannot be charged.

（５）高圧電池３００は、複数の電池セルを組み合わせて構成されている。セル電圧計測部５２０は、ステップＳ１５０において、複数の電池セルの各々の電圧を計測する。電池状態判定部５１１は、ステップＳ１７０において、複数の電池セルのうち少なくとも一つの電池セルの電圧が過放電判定値未満である場合、電池状態が第２の状態（過放電状態）であると判定する。このようにしたので、複数の電池セルを組み合わせて構成された高圧電池３００について、電池状態が第２の状態に該当するか否かを適切に判定することができる。 (5) The high-voltage battery 300 is configured by combining a plurality of battery cells. In step S150, the cell voltage measuring unit 520 measures the voltage of each of the plurality of battery cells. In step S170, the battery state determination unit 511 determines that the battery state is the second state (overdischarge state) when the voltage of at least one battery cell among the plurality of battery cells is less than the overdischarge determination value. To do. As a result, it is possible to appropriately determine whether or not the battery state of the high-voltage battery 300 configured by combining a plurality of battery cells corresponds to the second state.

（６）電池状態判定部５１１は、電池状態が第１の状態および第２の状態のいずれでもないと判定した場合、電池状態が第３の状態（通常電欠状態）であると判定する（ステップＳ１７０：Ｎｏ）。充電指示部５１２は、電池状態が第３の状態であると電池状態判定部５１１が判定した場合、高圧電池３００の充電を許可する（ステップＳ２４０〜Ｓ２６０）。このようにしたので、高圧電池３００の電池状態に応じて、通常時と同様に充電可能な場合は適切な充電電流により充電を行うことができる。 (6) When the battery state determination unit 511 determines that the battery state is neither the first state nor the second state, the battery state determination unit 511 determines that the battery state is the third state (normal power shortage state) ( Step S170: No). When the battery state determination unit 511 determines that the battery state is the third state, the charge instruction unit 512 permits charging of the high-voltage battery 300 (steps S240 to S260). Therefore, depending on the battery state of the high-voltage battery 300, if charging is possible in the same manner as in the normal state, charging can be performed with an appropriate charging current.

（７）高圧電池３００は、地上側に設置された一次コイルＬ１から放出される交流磁界を受けて無線給電される受電装置２００と接続されることで充電される。受電装置２００は、二次コイルＬ２と、二次コイルＬ２に接続されて所定の共振周波数を有する共振回路を二次コイルＬ２とともに構成する共振要素である共振コイルＬｘおよび共振コンデンサＣｘと、複数のスイッチング素子であるＭＯＳトランジスタＱ１、Ｑ２を有し、ＭＯＳトランジスタＱ１、Ｑ２をそれぞれスイッチング動作させることで、二次コイルＬ２が交流磁界を受けて共振回路に流れる交流電流ｉを制御する電力変換部２５０とを備える。このようにしたので、無線給電により高圧電池３００を充電することができる。 (7) The high-voltage battery 300 is charged by being connected to a power receiving device 200 that receives an alternating magnetic field emitted from a primary coil L1 installed on the ground side and is wirelessly supplied with power. The power receiving device 200 includes a plurality of secondary coils L2, a resonance coil Lx and a resonance capacitor Cx, which are resonance elements that are connected to the secondary coil L2 and form a resonance circuit having a predetermined resonance frequency together with the secondary coil L2. Power conversion unit 250 that has MOS transistors Q1 and Q2 that are switching elements and controls the AC current i that the secondary coil L2 receives an AC magnetic field and flows through the resonant circuit by switching the MOS transistors Q1 and Q2, respectively. And. Since this is done, the high-voltage battery 300 can be charged by wireless power supply.

なお、以上説明した実施形態において、駆動制御部２４０や電池監視装置５００が有する各構成要素は、マイクロコンピュータ等で実行されるソフトウェアにより実現してもよいし、ＦＰＧＡ（Field-Programmable Gate Array）等のハードウェアにより実現してもよい。また、これらを混在して使用してもよい。 In the embodiment described above, each component of the drive control unit 240 and the battery monitoring device 500 may be realized by software executed by a microcomputer or the like, an FPGA (Field-Programmable Gate Array) or the like. It may be realized by the hardware of. Further, these may be mixed and used.

上記実施形態では、電気自動車等の車両への無線給電において利用される無線給電システム１を説明したが、車両への無線給電用に限らず、他の用途の無線給電システムに本発明を適用してもよい。また、無線給電ではなく、電線を用いた有線給電により高圧電池３００を充電する場合でも、本発明の適用が可能である。 In the above embodiment, the wireless power supply system 1 used for wireless power supply to a vehicle such as an electric vehicle has been described, but the present invention is applied not only to wireless power supply to a vehicle but also to a wireless power supply system for other purposes. You may. Further, the present invention can be applied even when the high-voltage battery 300 is charged by a wired power supply using an electric wire instead of a wireless power supply.

以上説明した実施形態や各種変形例はあくまで一例であり、発明の特徴が損なわれない限り、本発明はこれらの内容に限定されるものではない。また、上記では種々の実施形態や変形例を説明したが、本発明はこれらの内容に限定されるものではない。本発明の技術的思想の範囲内で考えられるその他の態様も本発明の範囲内に含まれる。 The embodiments and various modifications described above are merely examples, and the present invention is not limited to these contents as long as the features of the invention are not impaired. Moreover, although various embodiments and modifications have been described above, the present invention is not limited to these contents. Other aspects conceivable within the scope of the technical idea of the present invention are also included within the scope of the present invention.

１ 無線給電システム
１００ 送電装置
１１０ 送電制御部
１２０ 通信部
１３０ 交流電源
１４０ 電力変換部
２００ 受電装置
２１０ 受電制御部
２２０ 通信部
２３０ 交流電流検出部
２４０ 駆動制御部
２４１ 電圧取得部
２４３ 駆動信号生成部
２４４ ゲート駆動回路
２５０ 電力変換部
３００ 高圧電池
４００ 負荷
５００ 電池監視装置
５１０ 演算処理部
５１１ 電池状態判定部
５１２ 充電指示部
５２０ セル電圧計測部
５３０ 絶縁診断部
５４０ 記録部
５５０ 出力部
６１１，６１２，６１３，６１４ リレー
６１５ コンバータ
６１６ 低圧電池
Ｌ１ 一次コイル
Ｌ２ 二次コイル
Ｌｘ 共振コイル
Ｃｘ 共振コンデンサ
Ｔｒ トランス
Ｑ１，Ｑ２ ＭＯＳトランジスタ 1 Wireless power supply system 100 Power transmission control unit 110 Transmission control unit 120 Communication unit 130 AC power supply 140 Power conversion unit 200 Power reception device 210 Power reception control unit 220 Communication unit 230 AC current detection unit 240 Drive control unit 241 Voltage acquisition unit 243 Drive signal generation unit 244 Gate drive circuit 250 Power conversion unit 300 High-voltage battery 400 Load 500 Battery monitoring device 510 Calculation processing unit 511 Battery status determination unit 512 Charging indicator 520 Cell voltage measurement unit 530 Insulation diagnosis unit 540 Recording unit 550 Output unit 611, 612, 613 614 Relay 615 Converter 616 Low voltage battery L1 Primary coil L2 Secondary coil Lx Resonant coil Cx Resonant capacitor Tr Transformer Q1, Q2 MOS transistor

Claims (8)

電動車両に搭載された電池の充電を制御する充電制御装置であって、
前記電池の電圧を計測する電圧計測部と、
前記電圧計測部による前記電池の電圧の計測結果に基づいて、前記電池の状態に対応する電池状態が第１の状態、第２の状態または第３の状態のいずれであるかを判定する電池状態判定部と、
前記電池状態判定部による前記電池状態の判定結果に基づいて、前記電池の充電方法を切り替える充電指示部と、を備える充電制御装置。 A charge control device that controls the charging of batteries mounted on electric vehicles.
A voltage measuring unit that measures the voltage of the battery and
Based on the measurement result of the voltage of the battery by the voltage measuring unit, the battery state for determining whether the battery state corresponding to the state of the battery is the first state, the second state, or the third state. Judgment unit and
A charging control device including a charging instruction unit for switching a charging method of the battery based on a determination result of the battery state by the battery state determining unit. 請求項１に記載の充電制御装置において、
前記電池が電欠状態になったときに前記電圧計測部により計測された前記電池の電圧を記録する記録部をさらに備え、
前記電池状態判定部は、前記記録部に記録された前記電池の電圧と現在の前記電池の電圧との差が所定の劣化判定値以上である場合、前記電池状態が前記第１の状態であると判定し、
前記充電指示部は、前記電池状態が前記第１の状態であると前記電池状態判定部が判定した場合、前記電池の充電を禁止する充電制御装置。 In the charge control device according to claim 1,
A recording unit for recording the voltage of the battery measured by the voltage measuring unit when the battery is out of power is further provided.
When the difference between the voltage of the battery recorded in the recording unit and the current voltage of the battery is equal to or greater than a predetermined deterioration determination value, the battery state determination unit is in the first state. Judging that
The charging instruction unit is a charging control device that prohibits charging of the battery when the battery state determining unit determines that the battery state is the first state. 請求項２に記載の充電制御装置において、
前記電池は、複数の電池セルを組み合わせて構成されており、
前記電圧計測部は、前記複数の電池セルの各々の電圧を計測し、
前記電池状態判定部は、前記複数の電池セルのうち少なくとも一つの電池セルについて前記記録部に記録された電圧と現在の電圧との差が前記劣化判定値以上である場合、前記電池状態が前記第１の状態であると判定する充電制御装置。 In the charge control device according to claim 2,
The battery is composed of a combination of a plurality of battery cells.
The voltage measuring unit measures the voltage of each of the plurality of battery cells, and measures the voltage of each of the plurality of battery cells.
When the difference between the voltage recorded in the recording unit and the current voltage of at least one battery cell among the plurality of battery cells is equal to or greater than the deterioration determination value, the battery state determination unit determines the battery state. A charge control device that determines that it is in the first state. 請求項１に記載の充電制御装置において、
前記電池状態判定部は、前記電池の電圧が所定の過放電判定値未満である場合、前記電池状態が前記第２の状態であると判定し、
前記充電指示部は、前記電池状態が前記第２の状態であると前記電池状態判定部が判定した場合、前記電池の充電を制限する充電制御装置。 In the charge control device according to claim 1,
When the voltage of the battery is less than a predetermined over-discharge determination value, the battery state determination unit determines that the battery state is the second state.
The charging instruction unit is a charging control device that limits charging of the battery when the battery state determining unit determines that the battery state is the second state. 請求項４に記載の充電制御装置において、
前記電池状態判定部は、前記電池状態が前記第２の状態であると判定した場合、前記電池の電圧が前記過放電判定値よりも低い所定の充電可能判定値以上であるか否かを判定し、
前記充電指示部は、
前記電池状態が前記第２の状態であり、かつ前記電池の電圧が前記充電可能判定値以上であると前記電池状態判定部が判定した場合には、通常充電時の電流よりも小さい所定の低電流で前記電池を充電させ、
前記電池状態が前記第２の状態であり、かつ前記電池の電圧が前記充電可能判定値未満であると前記電池状態判定部が判定した場合には、前記電池の充電を禁止する充電制御装置。 In the charge control device according to claim 4,
When the battery state determination unit determines that the battery state is the second state, it determines whether or not the voltage of the battery is equal to or higher than a predetermined rechargeable determination value lower than the overdischarge determination value. And
The charging indicator
When the battery state determination unit determines that the battery state is the second state and the voltage of the battery is equal to or higher than the chargeability determination value, a predetermined low that is smaller than the current during normal charging. The battery is charged with an electric current,
A charge control device that prohibits charging of the battery when the battery state determination unit determines that the battery state is the second state and the voltage of the battery is less than the chargeability determination value. 請求項４または５に記載の充電制御装置において、
前記電池は、複数の電池セルを組み合わせて構成されており、
前記電圧計測部は、前記複数の電池セルの各々の電圧を計測し、
前記電池状態判定部は、前記複数の電池セルのうち少なくとも一つの電池セルの電圧が前記過放電判定値未満である場合、前記電池状態が前記第２の状態であると判定する充電制御装置。 In the charge control device according to claim 4 or 5.
The battery is composed of a combination of a plurality of battery cells.
The voltage measuring unit measures the voltage of each of the plurality of battery cells, and measures the voltage of each of the plurality of battery cells.
The battery state determination unit is a charge control device that determines that the battery state is the second state when the voltage of at least one of the plurality of battery cells is less than the over-discharge determination value. 請求項１に記載の充電制御装置において、
前記電池状態判定部は、前記電池状態が前記第１の状態および前記第２の状態のいずれでもないと判定した場合、前記電池状態が前記第３の状態であると判定し、
前記充電指示部は、前記電池状態が前記第３の状態であると前記電池状態判定部が判定した場合、前記電池の充電を許可する充電制御装置。 In the charge control device according to claim 1,
When the battery state determination unit determines that the battery state is neither the first state nor the second state, the battery state determination unit determines that the battery state is the third state.
The charging instruction unit is a charging control device that permits charging of the battery when the battery state determining unit determines that the battery state is the third state. 請求項１に記載の充電制御装置において、
前記電池は、地上側に設置された一次コイルから放出される交流磁界を受けて無線給電される受電装置と接続されることで充電され、
前記受電装置は、
二次コイルと、
前記二次コイルに接続されて所定の共振周波数を有する共振回路を前記二次コイルとともに構成する共振要素と、
複数のスイッチング素子を有し、前記複数のスイッチング素子をそれぞれスイッチング動作させることで、前記二次コイルが前記交流磁界を受けて前記共振回路に流れる交流電流を制御する電力変換部と、を備える充電制御装置。 In the charge control device according to claim 1,
The battery is charged by being connected to a power receiving device that receives an alternating magnetic field emitted from a primary coil installed on the ground side and is wirelessly supplied with power.
The power receiving device is
With the secondary coil
A resonance element connected to the secondary coil and forming a resonance circuit having a predetermined resonance frequency together with the secondary coil.
Charging including a power conversion unit having a plurality of switching elements and controlling the alternating current flowing through the resonance circuit by receiving the alternating magnetic field by the secondary coil by switching the plurality of switching elements. Control device.
JP2018046619A 2018-03-14 2018-03-14 Charge control device Pending JP2021083137A (en)

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