INVERTER CONTROLLER, POWER CONVERTER, AND AIR CONDITIONING SYSTEM

摘要

PROBLEM TO BE SOLVED: To provide an inverter controller with which it is possible to reduce manufacturing costs and measure a motor current with high accuracy.;SOLUTION: A CPU 4A for controlling the operation of an inverter comprises a first internal amplifier 401a, a first internal A/D converter 402a, a second internal amplifier 401b, a second internal A/D converter 402b, and a motor current measurement unit 410 for computing the measured value of a motor current I on the basis of a first voltage value obtained through the first internal A/D converter 402a and a second voltage value obtained through the second internal A/D converter 402b. A current detection circuit 4B comprises a shunt resistor element Rs inserted in a main wiring N, a first connection wiring S1 for connecting one end of the shunt resistor element RS with an input terminal T1 to the first internal amplifier 401a, and a second connection wiring S2 for connecting the other end of the shunt resistor element RS with an input terminal T2 to the second internal amplifier 401b.;SELECTED DRAWING: Figure 2;COPYRIGHT: (C)2019,JPO&INPIT