Modeling and Control of a Three-Phase Push-Pull DC-DC Converter: Theory and Simulation

This paper presents closed loop control to a three-phase push-pull dc-dc converter. The power circuit is constituted by an inductor, a three-phase transformer, a capacitor, three switching transistors and three power... [ view full abstract ]

This paper presents closed loop control to a three-phase push-pull
dc-dc converter. The power circuit is constituted by an inductor, a three-phase transformer, a capacitor, three switching transistors and three power diodes. The converter originally offers the advantages of compact passive devices, low
conduction power losses, low output ripples around duty cycle of 1/3. The control technique is based at inner control loop by current self-control at switching transistors and an outer control loop by output voltage. The self-control current guarantee the operation of transformer out of core saturation area. Simulation results at closed loop were obtained on the mentioned converter with an input voltage of 120V, output voltage of 48V, load power of 500W, and switching frequency of 35kHz.