Discharge device and discharge method for the active discharge of a capacitor for use in the electric-power system of an electric-drive vehicle
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United States of America Patent
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May 26, 2015
Grant Date -
Aug 15, 2013
app pub date -
Aug 13, 2012
filing date -
Aug 12, 2011
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Abstract
A discharge device actively discharges a main capacitor in an electric-power system of an electric-drive vehicle and comprises a discharge branch of a circuit connected in parallel to the capacitor and including a discharge transistor biased to “conduction” mode when the capacitor must be discharged. A control device is connected to a “gate/base” terminal of and controls the transistor, biasing the transistor to the mode when the capacitor is required to fee discharged. A control transistor maintains the discharge transistor in a “non-conductive” state when the control transistor is in the mode. The control transistor is in the state for the discharge transistor to be in the mode. A safety capacitor is interposed between the terminal and a power supply and charges when the discharge transistor is in the mode, causing a progressive decrease of current at the terminal, until the discharge transistor is biased to the state.
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