Power plug locking device

A power plug locking device that functions in a plug lock state, in which the power plug locking device prohibits removal of a power plug from an inlet, and a plug unlock state, in which the power plug locking device permits removal of the power plug from the inlet, wherein the power plug locking device is used with a door lock motor and performs a door locking operation when supplied with a lock current and a door unlocking operation when supplied with an unlock current, the power plug locking device comprising:

• a relay connected to the door lock motor, wherein the relay switches the lock current and the unlock current;
• a plug unlock motor connected in parallel to the door lock motor, wherein the plug unlock motor performs a plug unlocking operation in cooperation with the door unlocking operation of the door lock motor;
• and
• a switch arranged between the relay and the plug unlock motor, wherein the switch starts and stops supplying the unlock current from the relay to the plug unlock motor, wherein the switch is activated in the plug lock state to supply the unlock current to the plug unlock motor and deactivated in the plug unlock state to stop supplying the unlock current to the plug unlock motor.

A power plug locking device that functions in a plug lock state, in which the power plug locking device prohibits removal of a power plug from an inlet, and a plug unlock state, in which the power plug locking device permits removal of the power plug from the inlet, wherein the power plug locking device is used with a door lock motor and performs a door locking operation when supplied with a lock current and a door unlocking operation when supplied with an unlock current, the power plug locking device comprising:

• a plug unlock motor that performs a plug unlocking operation when supplied with a drive current that differs from the lock current and the unlock current;
• a relay connected to the door lock motor, wherein the relay switches the lock current and the unlock current;
• a switch activated in the plug lock state and deactivated in the plug unlock state;
• and
• an AND circuit including input terminals, which are connected to the switch and a node between the relay and the door lock motor, and an output terminal, which is connected to the plug unlock motor, wherein the AND circuit supplies the drive current to the plug unlock motor from the output terminal when the unlock current is supplied to the door lock motor in the plug lock state and otherwise supplies the drive current to the plug unlock motor from the output terminal.

A power plug locking device that functions in a plug lock state, in which the power plug locking device prohibits removal of a power plug from an inlet, and a plug unlock state, in which the power plug locking device permits removal of the power plug from the inlet, wherein the power plug locking device is used with a door lock motor and performs a door locking operation when supplied with a lock current and a door unlocking operation when supplied with an unlock current, the power plug locking device comprising:

• a plug unlock motor that performs a plug unlocking operation when supplied with a drive current that differs from the lock current and the unlock current;
• a relay connected to the door lock motor, wherein the relay switches the lock current and the unlock current;
• a switch activated in the plug lock state and deactivated in the plug unlock state, wherein the switch is connected to a node between the relay and the door lock motor;
• and
• a switch circuit including an input terminal, which is connected to the switch, and an output terminal, which is connected to the plug unlock motor, wherein the switch circuit supplies the drive current to the plug unlock motor from the output terminal when the unlock current is supplied to the door lock motor in the plug lock state and otherwise supplies the drive current to the plug unlock motor from the output terminal.