Improved Control Strategy for Dual-Buck Full-Bridge Inverter with Single Current Sensor

This paper presents an improved control strategy for dual-buck full-bridge inverter (DBFBI) with single current sensor. Hysteresis current control is used in the DBFBI. The shoot-through problem does not exist. All the power devices and filter inductors operate at each half line cycle, thus the efficiency can be increased. Only one switch works at high frequency when the reference current and the output voltage have the same polarity, and thus the switching loss can be reduced. The freewheeling current flows through the independent diodes instead of the body diodes of the switches, so reverse recovery losses of the diodes can be decreased. Only one current sensor is used, hence the cost of the DBFBI could be reduced compared with the conventional control method. The operating principle is illustrated. Finally, simulation results from a 1-kVA DBFBI verify the theoretical analysis.