DIAGNOSIS APPARATUS AND DIAGNOSIS METHOD FOR RELAY CIRCUIT
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United States of America Patent
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Issued Date -
Feb 26, 2015
app pub date -
Jul 31, 2014
filing date -
Aug 26, 2013
priority date (Note) -
Abandoned
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Abstract
An example of a relay circuit includes: a capacitor connecting both ends of a load circuit; first and second main relays disposed in power supply lines between a direct-current power supply and the load circuit; a series circuit configured by a first resistor and a precharge relay disposed in parallel with the first main relay; and a second resistor connecting both ends of the load circuit. A discharge process is performed in which both the first main relay and the precharge relay are turned on, the second main relay is turned off, and a reactive current is caused to flow through the load circuit. In this discharge process, an abnormality of the first resistor is detected based on a both-end voltage of the capacitor detected by a voltage sensor and a resistance value that is an equivalent representation of the discharge process.
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