Motor driving circuit, motor device, and electric vehicle
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United States of America Patent
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Jan 23, 2018
Issued Date -
N/A
app pub date -
May 1, 2017
filing date -
Mar 23, 2012
priority date (Note) -
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Abstract
A motor driving circuit has a supply line connected to a DC power source, an inverter whose input side is connected to the supply line and whose output side is connected to a motor, a power switch inserted in the supply line for switching the supply line between conducting and cut-off states, a voltage detector for detecting a voltage between the direct-current power source and the power switch, and an insulation resistance detector for first detecting, based on a result of detection by the voltage detector with the power switch in the cut-off state, an insulation resistance on the preceding-stage side of the power switch and subsequently detecting, based on a result of detection by the voltage detector with the power switch in the conducting state, an insulation resistance on the succeeding-stage side of the power switch.
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