CONTROL CIRCUIT FOR DC/AC CONVERTER

摘要

PROBLEM TO BE SOLVED: To provide a simple control circuit for a DC/AC converter, which is composed of combination of a commercial power supply and photovoltaic power generation, and serves as an emergency source circuit for continuously supplying power from the commercial power supply to a load and an energy-saving circuit for stably supplying power from the photovoltaic power generation to a load, and which also avoids deterioration of a battery.SOLUTION: A control circuit for a DC/AC converter comprises: a battery 5 which composes a charging circuit 8 of a photovoltaic power generation system 2 and is connected to a DC/AC converter 4 via a first diode 7a; and a commercial power supply 6 to which an AC/DC automatic voltage controller 3 for converting AC current to DC current is connected and which is connected to the DC/AC converter 4 via a second diode 7b. The DC/AC converter 4 supplies AC power to a load 11 without momentary power interruption in a manner such that a primary source is switched between the battery 5 and the commercial power supply 6 by selection and setting of a voltage value (V) of the AC/DC automatic voltage controller 3 against a battery voltage value (V).