Patent ID: 6147887
Filing Date: 2000-11-14
Classification: H02M

Abstract:
An inverter which comprisesa direct voltage intermediate circuit consisting of a positive and a negative voltage busbar, andan auxiliary voltage source which generates auxiliary voltages referenced to the positive and the negative voltage busbar of the direct voltage intermediate circuit,the inverter also comprising for each phasean upper and a lower power semiconductor, which are connected in series between the positive and the negative voltage busbar, the point between the semiconductors forming the phase output of the inverter,an upper and a lower gate driver the outputs of which are connected to the control electrode of the respective upper and lower power semiconductors and which comprise a positive and a negative auxiliary voltage input and a zero potential point, which is connected to the output electrode of the power semiconductor to be controlled,a first diode the anode of which is connected to the positive auxiliary voltage referenced to the negative voltage busbar and the cathode to the positive auxiliary voltage input of the upper gate driver,and a first capacitor which is connected between the positive auxiliary voltage input of the upper gate driver and the zero potential point (Com), whereinthe inverter also comprises for each phaseanother diode the anode of the which is connected to the negative auxiliary voltage input of the upper gate driver and the cathode to the negative auxiliary voltage referenced to the positive busbar, andanother capacitor which is connected between the negative auxiliary voltage input and the zero potential point of the upper gate driver.