VOLTAGE COMPENSATOR CIRCUIT OF PULSE WIDTH MODULATION VOLTAGE TYPE INVERTER

摘要

PURPOSE:To obtain a stable compensation over an inexpensive and full operating range by comparing a DC current through an inverter with the voltage reference of a controller and compensating the operation of an inverter by the difference of both. CONSTITUTION:An inverter element T is driven through a drive circuit 6 by a logic circuit 4 for performing a pulse width modulation by the output from a controller 3. The DC current of an inverter element T is detected by a current transformer, and adjusted at the level by a voltage divider VR1. The level adjusted signal and the voltage reference signal from the controller 3 are compared by an operational amplifier A1, and the difference is inputted through a voltage divider VR2 to the controller 3.