Problem detection apparatus
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United States of America Patent
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Apr 14, 2020
Grant Date -
Jan 4, 2018
app pub date -
Apr 20, 2017
filing date -
Jul 4, 2016
priority date (Note) -
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Abstract
A problem detection apparatus includes a relay, a measurement circuit and a controller. The relay is provided between a power supply and an external circuit, both of which are in a high voltage system. The relay is configured to switch an electrical connection state of the power supply to the external circuit between a closed state and an open state. The measurement circuit measures a voltage of a circuit in the high voltage system. The measurement circuit is in the high voltage system and connected between the relay and the external circuit. In a case where a command to switch the relay to the open state has been output, the controller detects, based on the voltage measured by the measurement circuit, whether or not the relay has a short circuit. The controller is in a low voltage system having a lower voltage than a voltage of the high voltage system.
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