ELECTRIC POWER TRANSMISSION SYSTEM

• US 20150054456A1
• Filed: 02/27/2013
• Published: 02/26/2015
• Est. Priority Date: 02/29/2012
• Status: Abandoned Application

• Current Assignee: Equos Research Co., Ltd. (Aisin Corp.)
• Original Assignee: Equos Research Co., Ltd. (Aisin Corp.)
• Inventors: Yamakawa, Hiroyuki, Ito, Yasuo, Hayashi, Koki
• Application Number:
  US14/381,793
• Publication Number:
  US 20150054456A1
• Time in Patent Office: Days
• US Class Current: 320/108
• CPC Class Codes: B60L 2210/20 AC to AC converters
• CPC Class Codes: B60L 2210/30 AC to DC 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: H01F 38/14 Inductive couplings for wireless supply or distribution of electric power using inductive coupling H02J50/10
• CPC Class Codes: H01M 10/44 Methods for charging or discharging circuits for charging H02J7/00
• CPC Class Codes: H01M 10/46 Accumulators structurally combined with charging apparatus circuits for charging H02J7/00
• CPC Class Codes: H01M 2220/20 Batteries in motive systems, e.g. vehicle, ship, plane
• CPC Class Codes: H01M 8/04671 of the individual fuel cell
• 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 50/90 involving detection or optimisation of position, e.g. alignment
• CPC Class Codes: H02J 7/00034 Charger exchanging data with an electronic device, i.e. telephone, whose internal battery is under charge
• CPC Class Codes: H02M 7/5387 in a bridge configuration
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02E 60/50 Fuel cells
• 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

An electric power transmission system for curbing reduction in power transmission transmits energy via an electromagnetic field from a power transmission antenna to a power receiving antenna including: an inverter converting DC to AC voltage of a predetermined frequency to output; a power transmission-side control unit controls a drive frequency of the inverter and DC voltage input to the inverter; controlling a power value output from the inverter kept at constant level; the power transmission antenna to which AC voltage is input from the inverter; a rectifying unit rectifies output of the power receiving antenna obtaining DC voltage, and outputs DC voltage; a step-up and step-down unit steps up or down DC voltage output from the rectifying to output; a battery is charged with output of step-up and step-down unit; and a power receiving-side control unit controls the step-up and step-down unit to charge the battery with maximum power value.

Claims

1. An electric power transmission system that transmits electric energy via an electromagnetic field from a power transmission antenna to a power receiving antenna, comprising:

an inverter unit that converts DC voltage to AC voltage of a predetermined frequency to output;

a power transmission-side control unit that controls a drive frequency of the inverter unit and a voltage value of DC voltage input to the inverter unit, and controls power output from the inverter unit;

the power transmission antenna to which AC voltage is input from the inverter unit;

a rectifying unit that rectifies an output of the power receiving antenna to obtain DC voltage, and outputs the DC voltage;

a step-up and step-down unit that steps up or down DC voltage output from the rectifying unit to output;

a battery that is charged with an output of the step-up and step-down unit; and

a power receiving-side control unit that controls the step-up and step-down unit in such a way as to charge the battery with maximum efficiency.

2. The electric power transmission system according to claim 1, wherein:

the power transmission-side control unit controls in such a way as to keep an output power value of the inverter unit at a constant level; and

the power receiving-side control unit controls the step-up and step-down unit in such a way as to charge the battery with a maximum power value.

3. The electric power transmission system according to claim 1, wherein

as the drive frequency of the inverter unit, a higher extreme-value frequency is used out of two extreme-value frequencies.

4. The electric power transmission system according to claim 2, wherein

as the drive frequency of the inverter unit, a higher extreme-value frequency is used out of two extreme-value frequencies.