DISCHARGE DEVICE AND DISCHARGE METHOD TO ACTIVELY DISCHARGE A CAPACITOR USED IN THE ELECTRIC-POWER SYSTEM OF AN ELECTRIC DRIVE VEHICLE
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United States of America Patent
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Issued Date -
Aug 8, 2013
app pub date -
Aug 9, 2012
filing date -
Aug 12, 2011
priority date (Note) -
Abandoned
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Abstract
A discharge device actively discharges a main capacitor in an electric-power system of an electric-drive vehicle. The discharge device comprises a discharge branch of a circuit that is connected in parallel to the main capacitor and includes a discharge transistor that is biased to “conduction” mode when the discharge transistor is required to discharge the main capacitor. A control device is connected to a “gate/base” terminal of the discharge transistor and commands the discharge transistor, biasing the discharge transistor to the “conduction” mode when the discharge transistor is required to discharge the main capacitor. A control unit activates, when the main capacitor is required to be discharged, an electronic high-voltage power converter that is connected in parallel to the main capacitor and drives an electric machine to circulate through the electric machine an electric current that causes no generation or absorption of torque. A method actively discharges the main capacitor.
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