CONTROLLER OF RECTIFIER CIRCUIT

摘要

PURPOSE:To efficiently operate even in a light load range by comparing a current control signal in response to a current deviation between an AC input current and a current detection signal with a carrier wave to control ON and OFF a switching element of a stepup chopper. CONSTITUTION:A switching element 34 in a stepup chopper 30 is controlled ON and OFF by ON/OFF signal output from an ON/OFF controller 100. The conduction rate of the chopper 30 due to the ON/OFF of the element 34 varies proportionally to the current deviation between the current command of a current command generator 80 and the current detection signal of a current detector 90. A current deviation is obtained by a subtractor 70. The generator 80 is composed of a filter 81, a zero phase detector 82 and a current command forming circuit 83. A load current flowed to a load 50 is detected by a current detector 60A, and input to the filter 81.