Non-contact electric power transmitting device and electric power transfer system

Patent metadata

Field	Value
Publication number	US-2016365752-A1
Application number	US-201615172792-A
Country	US
Kind code	A1
Filing date	Jun 3, 2016
Priority date	Jun 10, 2015
Publication date	Dec 15, 2016
Grant date	—

Abstract

A non-contact electric power transmitting device includes an electronic control unit configured to perform; i) a first control that controls a transmitted electric power to a target electric power by adjusting a duty cycle of an output voltage of an inverter, ii) a second control that controls a turn-on current representing an output current of the inverter by adjusting a drive frequency, the output current being an output current at a time when the output voltage rises, and iii) adjusting the duty and the drive frequency such that a current supplied from the inverter to an electric power transmitting unit decreases within the range in which the turn-on current is smaller than or equal to a limit value, while performing the first control.

First claim

1 . A non-contact electric power transmitting device configured to transmit an electric power to an electric power receiving device in a non-contact manner, the non-contact electric power transmitting device comprising:
an electric power transmitting unit; an inverter configured to supply a transmitted electric power to be transmitted to the electric power receiving device having a drive frequency to the electric power transmitting unit, the inverter being a voltage inverter; and an electronic control unit configured to control the inverter, the electronic control unit being configured to perform; i) a first control that controls the transmitted electric power to a target electric power by adjusting a duty cycle of an output voltage of the inverter, ii) a second control that controls a turn-on current representing an output current of the inverter by adjusting the drive frequency, the output current being an output current at a time when the output voltage rises, and iii) adjusting the duty and the drive frequency such that a current supplied from the inverter to the electric power transmitting unit decreases within the range in which the turn-on current is equal to or smaller than a limit value, while controlling the transmitted electric power to the target electric power through the first control.

2 . The non-contact electric power transmitting device according to claim 1 , wherein
the electronic control unit is configured to adjust the duty and the drive frequency such that the current supplied from the inverter to the electric power transmitting unit is minimized within the range in which the turn-on current is equal to or smaller than the limit value, while controlling the transmitted electric power to the target electric power through the first control.

3 . The non-contact electric power transmitting device according to claim 1 , wherein
the electronic control unit sets, in a case where there are two drive frequencies at which the turn-on current is a predetermined value equal to or smaller than the limit value under a condition that the electric power to be transmitted is constant, one of the two drive frequencies at which a magnitude of the current supplied from the inverter to the electric power transmitting unit is smaller, as an initial adjusted value of the drive frequency in the second control, in executing a process of activating the inverter.

4 . An electric power transfer system comprising:
an electric power transmitting device; and an electric power receiving device, wherein the electric power transmitting device includes; an electric power transmitting unit configured to transmit an electric power to the electric power receiving device in a non-contact manner, an inverter configured to supply a transmitted electric power to be transmitted to the electric power receiving device having a drive frequency to the electric power transmitting unit, the inverter being a voltage inverter, and an electronic control unit configured to control the inverter, the electronic control unit being configured to perform; i) a first control that controls the transmitted electric power to a target electric power by adjusting a duty cycle of an output voltage of the inverter, ii) a second control that controls a turn-on current representing an output current of the inverter by adjusting the drive frequency, the output current being an output current at a time when the output voltage rises, and iii) adjusting the duty and the drive frequency such that a current supplied from the inverter to the electric power transmitting unit decreases within the range in which the turn-on current is equal to or smaller than a limit value, while controlling the transmitted electric power to the target electric power through the first control.

5 . The electric power transfer system according to claim 4 , wherein
the electronic control unit is configured to adjust the duty and the drive frequency such that the current supplied from the inverter to the electric power transmitting unit is minimized within the range in which the turn-on current is equal to or smaller than the limit value, while controlling the transmitted electric power to the target electric power through the first control.

6 . The electric power transfer system according to claim 4 , wherein
the electronic control unit is configured to set, in a case where there are two drive frequencies at which the turn-on current is a predetermined value equal to or smaller than the limit value under a condition that the electric power to be transmitted is constant, one of the two drive frequencies at which a magnitude of the current supplied from the inverter to the electric power transmitting unit is smaller, as an initial adjusted value of the drive frequency in the second control, in executing a process of activating the inverter.

Assignees

• Toyota Motor Co Ltd

Inventors

• Misawa Takahiro
• Sugiyama Yoshinobu

Classifications

• H02J7/933

  the cycle being controlled or terminated in response to electric parameters · CPC title

• H02J50/12 Primary

  of the resonant type · CPC title

• H02M1/12

  Arrangements for reducing harmonics from AC input or output · CPC title

• H02M1/42 Primary

  Circuits or arrangements for compensating for or adjusting power factor in converters or inverters · CPC title

• H02M7/217

  using semiconductor devices only · CPC title