SYSTEM INTERCONNECTION INVERTER

摘要

PROBLEM TO BE SOLVED: To reduce the size and cost a DC component detecting circuit of a system interconnection inverter by constituting it of hardware and software. SOLUTION: This system interconnection inverter comprises an integrating circuit 30 for reducing AC ripples on a detected current obtained by a current detecting means 20 for detecting output current, an amplifier circuit 40 for amplifying the amplitude of the output current reduced by the circuit 30, a microcomputer for deciding detection of DC components, by converting the analog output voltage of the circuit 40 with an analog/digital converter 70 and a full bridge inverter 90 for PWM-control of the voltage. Thus, a DC component detecting circuit of reduced size and cost is realized.