抄録
The ferro-resonant type power supply has high reliability, and is therefore used for power supply to electronic devices. Recently, a three phase inverter has been proposed (called the phase conversion type), which is a combination of a single phase squarewave inverter and a phase converter utilizing the phase conversion function of the ferro-resonant circuit. However, the phase conversion type causes difficulties in that the output voltages are not balanced and that the efficiency remains at about 60%. This paper reports experiments, analysis and review made on a three phase inverter (called the frequency divide type) having a phase converter utilizing the frequency divide function and a single phase square wave inverter in a combination. As a result, the characteristics of the device are clarified, and a high output balance and system efficiency are realized.
