Circuit for providing gate drive supply voltage to inverter and DC_link voltage sensing circuit

摘要

An object of the present invention is to provide a separate gate drive power supply circuit for an inverter which does not use a DC-DC converter for sensing the VDC_LINK voltage to the motor drive system including an inverter. The present invention to achieve the above object, in a gate drive power supply circuit used in the drive, and a plurality of output terminals to an input terminal applied with the input voltage and output a plurality of output voltage, and converts the input voltage the DC-DC converter that outputs a plurality of output voltages by making each of the different voltage levels; And the plurality of connection to one of the two output terminals, when equal to or less than when the voltage input to a specific level as output, and the input voltage exceeds the predetermined level, a clamping unit for outputting as the specified level; And it provides a gate drive power supply circuit for an inverter having a regulator which converts it always by a constant voltage level receives a voltage output from the clamping portion.