Power supply apparatus and vehicle including the same
An ECU controls drive signals output to relays. A current sensor detects current flowing between one of the relays and a power supply port. A connection circuit is configured to electrically connect a first section with a second section when only one of the drive signals is placed into an active state by the ECU. The first section is a portion of a first one of power lines between the current sensor and the power supply port. The second section is a portion of a second one of the power lines between the relay and the power supply port.
1. A power supply apparatus comprising:
a DC power source;
a power supply port configured to supply electric power output from the DC power source to an outside of the power supply apparatus;
first and second power lines disposed between the DC power source and the power supply port;
a first relay provided on the first power line;
a second relay provided on the second power line;
an electronic control unit configured to control a first drive signal output to the first relay and a second drive signal output to the second relay;
a current sensor configured to detect current flowing between the first relay and the power supply port; and
a connection circuit configured to electrically connect a first section with a second section when only one of the first and second drive signals is placed into an active state by the electronic control unit, the first section is a portion of the first power line between the current sensor and the power supply port, the second section is a portion of the second power line between the second relay and the power supply port, wherein the connection circuit includes
an operation circuit configured to output an exclusive OR of the first and second drive signals,
a detection circuit configured to detect a change of the output of the operation circuit, and
a switch provided between the first section and the second section and configured to electrically connect the first section with the second section when an output of the detection circuit is in the active state.
2. The power supply apparatus according to claim 1 , wherein
the electronic control unit
determines that the second relay has become stuck in a closed state if current is detected by the current sensor when the first drive signal is placed into the active state while the second control signal is placed into an inactive state by the electronic control unit, and
determines that the first relay has become stuck in a closed state if current is detected by the current sensor when the second drive signal is placed into the active state while the first control signal is placed into the inactive state by the electronic control unit.
3. The power supply apparatus according to claim 1 , wherein
the detection circuit includes
a differential circuit configured to perform a differential operation on the output of the operation circuit, and
an absolute value circuit configured to perform an absolute value operation on an output of the differential circuit.
4. A vehicle comprising the power supply apparatus according to claim 1 .