Electric power control device

1. An electric power control device comprising:

a first connector connected to a second connector provided in a second appliance; and

a control circuit provided within a first appliance that exchanges electric power with the second appliance via a harness, the control circuit being connected to the first connector via the harness,

wherein

the first connector includes a latching solenoid that switches connector connection, which is connection between the first and second connectors, between a locked state and an unlocked state,

the control circuit

outputs a predetermined first voltage to an operating coil inside the latching solenoid to bring the connector connection into the locked state, and

outputs a predetermined second voltage to the operating coil to bring the connector connection into the unlocked state,

the operating coil is connected between first and second lines provided in the harness,

when a positive voltage as the first voltage is applied to the first line relative to the second line, the connector connection is brought into the locked state,

when a negative voltage as the second voltage is applied to the first line relative to the second line, the connector connection is brought into the unlocked state,

the control circuit has a voltage outputter that outputs one direct-current voltage or two direct-current voltages, the control circuit being operable to output the one direct-current voltage or one of the two direct-current voltages to between the first and second lines while keeping polarity of a voltage on the first line relative to the second line selectively either positive or negative,

the first connector includes an indicator that indicates whether or not the connector connection is in the locked state, and

the indicator is driven based on a voltage applied between the first and second lines.

2. The electric power control device according to claim 1 ,

wherein the control circuit detects

whether or not there is an abnormality in the harness,

whether or not there is an abnormality in a circuit within the control circuit itself, or

whether or not there is an abnormality in a circuit inside the first connector based on

a value of a current passing between the first and second lines and

polarity of a voltage applied between the first and second lines.

3. The electric power control device according to claim 2 ,

wherein control circuit,

detects whether or not there is an abnormality in the harness, detects whether or not there is a broken conductor or a short in the harness,

detects whether or not there is an abnormality in a circuit within the control circuit itself, detects whether or not there is at least one of an abnormal output of a switching device provided in the control circuit and an abnormal output of a voltage source for the control circuit, and

detects whether or not there is an abnormality in a circuit inside the first connector, detects whether or not there is a broken conductor within the first connector.

4. An electric power control device, comprising:

a first connector connected to a second, connector provided in a second appliance; and

a control circuit provided within a first appliance that exchanges electric power with the second appliance via a harness, the control circuit being connected to the first connector via the harness,

wherein

the first connector includes a latching solenoid that switches connector connection, which is connection between the first and second connectors, between a locked state and an unlocked state,

the control circuit

outputs a predetermined first voltage to an operating coil inside the latching solenoid to bring the connector connection into the locking state, and

outputs a predetermined second voltage to the operating coil to bring the connector connection into the unlocked state,

wherein the operating coil has

a set coil that brings the connector connection into the locked state in response to the first voltage being applied between a first line and a reference line inside the harness, and

a reset coil that brings the connector connection into the unlocked state in response to the second voltage being applied between a second line and the reference line inside the harness,

the first connector includes an indicator that indicates whether or not the connector connection is in the locked state, and

the control circuit drives the indicator by supplying the indicator with the first or second voltage via a third line inside the first connector.

5. The electric power control device according to claim 4 ,

wherein the control circuit detects

whether or not there is an abnormality in the harness,

whether or not there is an abnormality in a circuit within the control circuit itself, or

whether or not there is an abnormality in a circuit inside the first connector based on a value of a current passing through the reference line.

6. The electric power control device according to claim 5 ,

wherein the control circuit,

detects whether or not there is an abnormality in the harness, detects whether or not there is a broken conductor or a short circuit in the harness,

detects whether or not there is an abnormality in a circuit within the control circuit itself, detects whether there is at least one of an abnormal operation of a switching device provided in the control circuit and an abnormal output of a voltage source for the control circuit, and

detects whether or not there is an abnormality in a circuit inside the first connector, detects whether or not there is a broken conductor within the first connector.