ALTERNATING CURRENT POWER SUPPLY DEVICE AND INTEGRATED CIRCUIT FOR ALTERNATING CURRENT POWER SUPPLY DEVICE

摘要

An alternating current power supply device is provided with switch elements (Q1, Q2) for converting direct current power from a direct current power supply (Vin) into alternating current power; a transformer (T1) for converting the voltage of the alternating current power converted by the switch elements into other voltage; a load (20) connected to an output terminal of the transformer; a first detecting circuit (30) for detecting a first electric signal indicating power to be supplied to the load; a second detecting circuit (40) for detecting a second electric signal indicating the voltage of the direct current power supply; a feedback circuit (50) for generating a feedback signal based on the first electric signal detected by the first detecting circuit and the second electric signal detected by the second detecting circuit; and a control circuit (10) for generating a control signal based on the feedback signal from the feedback circuit and controlling on/off of the switch elements by the control signal so that power to be supplied to the load is at a prescribed value.