Patent ID: 11862992
Assignee: TOSHIBA TEC KABUSHIKI KAISHA
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  G | IPC G  H

Claim 0:
1. A power transmission device, which performs power transmission without contact with a power reception device, comprising:
a power transmission coil;
a power transmission circuit that generates transmission power and supplies the generated transmission power to the power transmission coil;
a current detection circuit that measures a current value input to the power transmission circuit; and
a control circuit that
measures, using the current detection circuit, a standby current in a standby state in which the power transmission to the power reception device is not performed, to obtain the measured current value as a reference value,
sets, as a foreign matter detection threshold, a value obtained by adding a constant value to the reference value or a value obtained by adding a constant ratio to the reference value, and
determines, in the standby state, when the current value detected by the current detection circuit is equal to or larger than the foreign matter detection threshold, that there is a foreign matter on the power transmission coil.