Patent ID: 8618753
Filing Date: 2013-12-31
Classification: H02M

Abstract:
1. An inverter device, comprising: a filter circuit including a capacitor and a coil; an inverter circuit including a plurality of switching devices, wherein the inverter circuit converts direct current outputted from a high-voltage battery through the filter circuit into three-phase alternate current by switching the switching devices ON and OFF, outputting electric current that is the alternate current to a motor; an electric current detecting circuit for detecting the electric current flowing through the motor; a voltage detecting circuit for detecting a voltage applied to the inverter circuit: a control circuit for outputting a drive signal so as to switch the switching devices ON and OFF, based on the electric current detected by the electric current detecting circuit, wherein the control circuit includes a shutdown circuit for stopping outputting the drive signal from the control circuit to the switching devices when the electric current detected by the electric current detecting circuit is an overcurrent or the voltage detected by the voltage detecting circuit is an overvoltage; and an internal power supply providing electric power to the control circuit by the voltage outputted from the high-voltage battery when the inverter circuit is connected to the high-voltage battery and also providing electric power by residual charge in the capacitor after the inverter device is disconnected from the high-voltage battery, wherein the shutdown circuit includes a determining circuit for determining whether a voltage outputted from the internal power supply is stabilized or not, wherein the shutdown circuit stops outputting the drive signal from the control circuit to the switching devices when the voltage outputted from the internal power supply is not stabilized, wherein, when the residual charge in the capacitor is used after the inverter device is disconnected from the high-voltage battery, the control circuit generates the drive signal based on a triangular reference waveform and three commands for keeping switching devices corresponding to one phase of three phases in either an ON state or an OFF state, and for switching ON and OFF other switching devices corresponding to two remaining phases of the three phases.