High Power, High Frequency, Switch Mode Rectifier

There are many types of inverter circuits for switching power supply. A full bridge inverter consisting of four transistors is suitable for high power, but magnetic asymmetrical phenomena of transformer easily occurs, especially at high frequency. Storage time is also a problem in bipolar transistors. The authors analyzed the asymmetrical phenomena of transformer in a bridge inverter, and found a method which can be used to decide: which circuit elements are appropriate, how to control the driving signals, and how to drive the transistor. We made a small size, high power, high frequency, switch mode rectifier using a high power bipolar transistor at 20 kHz conversion frequency.