CONTROL SYSTEM FOR INVERTER

PURPOSE:To obtain an output waveform similar to a sinusoidal wave by sequentially reading out unit data group in a period relative to the frequency of a 3- phase AC, and controlling ON and OFF a commutation element on the basis of the read-out information. CONSTITUTION:The output of a temperature sensor 1 for detecting a room temperature is applied to a V/F converter 3 through a sensor amplifier 2, the output is applied to an n-adic counter 4, and also applied to a CPU6 through an input port 5a. Binary information for controlling ON or OFF a transistor is stored in a memory 7, the CPU6 reads out the binary information, and outputs to a latch circuit 8 through an output port 5b. The memory 7 stores unit data group in a period relative to the frequency of the 3-phase AC for one cycle of 3-phase AC for a plurality of phases.