Improved inverter transformer winding design for high-current low-voltage rectifier applicationsa

High-frequency fast-recovery rectifiers have limited maximum current ratings; this requires parallel circuits for high-current high-frequency applications. To ensure good current sharing, it is advantageous to use separate transformer windings for each rectifier set. Each section should be as closely matched as possible. An improved winding design consists of a simplified coil with multiple secondaries for inverter transformers used in low-voltage high-current rectifier applications. Since the forward drop of a rectifier is significant in relation to outputs of only a few volts, the preferred configuration, for efficiency reasons, is a center-tapped winding. This configuration imposes only one forward drop of the rectifier compared to two forward drops in a bridge circuit. The coil design uses foil conductors and provides multiple parallel secondary windings for the purpose of controlling skin-effect losses, improving the winding space factor, improving the heat transfer, and providing coil designs that are simple and economic to manufacture. In addition, the configuration provides matched and balanced coupling and leakage inductance for each secondary section