This project presents a bidirectional soft-switching push-pull resonant converter that maintains high efficiency over a wide range of battery voltages. The system integrates a current-fed push-pull circuit and an active voltage doubler with a bidirectional switch. It operates as a PWM current-fed resonant-boost converter in the forward direction and a PWM half-bridge resonant converter in the reverse direction. The converter achieves zero-voltage switching (ZVS) during turn-off, reducing switching losses and improving performance. A 1 kW prototype demonstrates high conversion efficiency and stable operation under varying loads and voltages.      

Objectives:    

• To design a bidirectional converter that supports power transfer in both directions.
• To achieve soft-switching operation (ZVS) to minimize switching losses.
• To ensure high efficiency across a wide range of battery voltages.
• To maintain a high voltage conversion ratio without a high turns-ratio transformer.
• To verify the performance through simulation and prototype testing.

        Components Used:  

• MOSFET/IGBT switches (for bidirectional operation)
• Resonant inductor and capacitor (for soft-switching)
• Microcontroller / PWM controller (for control strategy)
• Active voltage doubler circuit
• Current-fed push-pull stage
• DC link capacitor
• Load resistor / battery system.
• PIC microcontroller.
• Voltage sensor.
• LCD display.

      Software’s used:  

• PIC-C compiler for Embedded C programming.
• PIC kit 2 programmer for dumping code into Micro controller.
• Express SCH for Circuit design.

                 

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