Contactless power transmission device and power transfer system
AssigneeToyota Jidosha Kabushiki Kaisha
InventorTakahiro Misawa
Life of this patent
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Abstract
A control unit executes a first control and a second control. The first control is to control transmission power to target power by adjusting a duty of an output voltage of an inverter. The second control is to control a turn-on current by adjusting the drive frequency, the turn-on current indicating an output current of the inverter at a rising of the output voltage. When the transmission power exceeds a limit value larger than the target power during adjustment of the drive frequency by the second control, the control unit decreases the target power in the first control.
Claims6
A contactless power transmission device comprising:
- a power transmission unit configured to transmit electric power to a power reception device in a contactless manner;
- a voltage-source inverter configured to supply transmission power to the power transmission unit in accordance with a drive frequency;
- and
- a control unit configured to control the inverter,
- the control unit configured to execute:
- a first control for controlling the transmission power to target power by adjusting a duty of an output voltage of the inverter;
- and
- a second control for controlling a turn-on current by adjusting the drive frequency, the turn-on current indicating an output current of the inverter at a rising of the output voltage,
- when the transmission power exceeds a limit value larger than the target power during adjustment of the drive frequency by the second control, the control unit being configured to decrease the target power in the first control.
A power transfer system comprising:
- a power transmission device;
- and
- a power reception device,
- the power transmission device including:
- a power transmission unit configured to transmit electric power to the power reception device in a contactless manner;
- a voltage-source inverter configured to supply transmission power to the power transmission unit in accordance with a drive frequency;
- and
- a control unit configured to control the inverter,
- the control unit configured to execute:
- a first control for controlling the transmission power to target power by adjusting a duty of an output voltage of the inverter;
- and
- a second control for controlling a turn-on current by adjusting the drive frequency, the turn-on current indicating an output current of the inverter at a rising of the output voltage,
- when the transmission power exceeds a limit value larger than the target power during adjustment of the drive frequency by the second control, the control unit being configured to decrease the target power in the first control.
Dependencies are inferred from the claim text.