Charging device for electric vehicle

• US 10,286,795 B2
• Filed: 01/13/2015
• Issued: 05/14/2019
• Est. Priority Date: 04/16/2014
• Status: Active Grant

• Current Assignee: Mitsubishi Electric Corporation
• Original Assignee: Mitsubishi Electric Corporation
• Inventors: Matsumoto, Sadayuki, Yabumoto, Takuya, Nagai, Takayoshi, Onishi, Yoshitaka
• Primary Examiner(s): Robbins, Jerry D
• Application Number:
  US15/120,306
• Publication Number:
  US 20170072807A1
• Time in Patent Office: 1,582 Days
• Field of Search: 320108
• CPC Class Codes: B60L 2210/10 DC to DC converters
• CPC Class Codes: B60L 2210/30 AC to DC converters
• CPC Class Codes: B60L 2210/40 DC to AC converters
• CPC Class Codes: B60L 53/126 Methods for pairing a vehicle and a charging station, e.g. establishing a one-to-one relation between a wireless power transmitter and a wireless power receiver
• CPC Class Codes: B60L 53/14 Conductive energy transfer
• CPC Class Codes: B60L 53/20 characterised by converters located in the vehicle
• CPC Class Codes: H02J 2207/40 adapted for charging from various sources, e.g. AC, DC or multivoltage
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/80 involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices
• CPC Class Codes: H02J 7/02 for charging batteries from ac mains by converters
• CPC Class Codes: H02M 1/4208 Arrangements for improving power factor of AC input
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y02T 10/7072 Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
• CPC Class Codes: Y02T 90/12 Electric charging stations
• CPC Class Codes: Y02T 90/14 Plug-in electric vehicles

Abstract

A charging device for an electric vehicle includes a wireless power receiving device which receives high-frequency AC power in a non-contact state, a wired power receiving device connected to an external power source for low-frequency AC power, a rectifier which rectifies AC power, an electric power converter which is positioned at a rear part of the rectifier, and an power receiving device switching switch which switches electric power in such a way that any of electric power of both electric power receiving devices is outputted to the rectifier. A high-frequency filter, which removes a high-frequency component, is provided between the rectifier and the electric power converter.

Claims

1. A charging device for an electric vehicle, the charging device comprising:

a wireless power receiving device which receives high-frequency AC power by a magnetic field connection with a high-frequency alternating magnetic field;

a wired power receiving device which is connected to an external power source for low-frequency AC power;

a rectifier which rectifies AC power which is outputted from the wireless power receiving device and the wired power receiving device;

an electric power converter which is connected to a rear part of the rectifier and includes at least one switching element;

an power receiving device switching switch which switches electric power in such a way that electric power of the wireless power receiving device or electric power of the wired power receiving device is outputted to the rectifier; and

a controller which controls the switching element in which a battery is charged by DC power which is outputted from the electric power converter, wherein

a high-frequency filter, which removes a high-frequency component included in electric power outputted from the rectifier, is provided between the rectifier and the electric power converter,

the wired power receiving device includes a full-wave rectifier by which low-frequency AC power, which is inputted from the external power source, is rectified for a full wave, an inverter which converts pulsating electric power, which is outputted from the full-wave rectifier, to high-frequency AC power in a state where a pulsating component is maintained, and an insulated transformer which is connected to a rear part of the inverter,

the high-frequency filter removes a high-frequency component which is related to a high-frequency component of the high-frequency AC power,

when electric power is received from the wireless power receiving device, DC power at a constant voltage is inputted to the electric power converter,

when the electric power is received from the wired power receiving device, pulsating electric power, in which a voltage waveform of the low-frequency AC power is rectified for a full wave, is inputted to the electric power converter,

when the electric power is received from the wireless power receiving device, the controller controls the switching element in such way that the controller performs, by controlling the switching element, a resistance conversion operation in which a voltage, which is inputted to the electric power converter, is increased or decreased, and outputs a constant voltage,

when the electric power is received from the wired power receiving device, the controller controls the switching element in such way that the controller performs, by controlling the switching element, a power-factor improvement operation in which a power factor of electric power, which is inputted from the external power source, is improved, and outputs a constant voltage,

when the electric power is received from the wireless power receiving device, the controller controls a ratio between a voltage, which is inputted to the electric power converter, and a voltage, which is outputted from the electric power converter, in accordance with a state of a charge of the battery,

when an equivalent resistance of the battery is smaller than a load resistance, a step-down operation of the electric power converter is performed by the controller, the load resistance being determined in accordance with a connection coefficient between an electric power receiving coil, which is included in the wireless power receiving device, and an electric power transmission coil, which is connected to the electric power receiving coil, and

when the equivalent resistance of the battery is larger than the load resistance, a step-up operation of the electric power converter is performed by the controller.

2. The charging device as recited in claim 1, wherein the high-frequency filter is composed of a capacitor which is connected between a high voltage side and a low voltage side of an output terminal of the rectifier.

3. The charging device as recited in claim 2, wherein a frequency of high-frequency AC power that is outputted from the inverter is identical to a frequency of a high-frequency AC power that is received by the wireless power receiving device.

4. The charging device as recited in claim 1, wherein a frequency of the high-frequency AC power that is outputted from the inverter[H] is identical to a frequency of a high-frequency AC power that is received by the wireless power receiving device.