A Full-Load Range ZVS Control Scheme of an Inverting Resonant Four-Switch Buck-Boost DC/DC Converter for 5G-RF Power Amplifier

A four-switch resonant-based inverting buck-boost dc/dc converter demonstrates a promising advantage in the realm of an inverting voltage regulation within power supply applications. This converter employs a soft-switching control operation across the entire load range through four segments of resonance current shaping control (CSC). In this control scheme, the duty ratio and phase shift are controlled differently for light and heavy load current operations. Consequently, the RMS value of the resonance current remains notably lower compared to schemes involving discontinuous conduction mode (DCM) and three-dimension control, which reduces the conduction loss and increases the efficiency with wide inverting voltage regulation. Ultimately, a prototype of a four-switch resonant inverting buck-boost dc/dc converter is constructed for experimental investigation, and it achieves a 98.4% peak efficiency when operating at −48Vin to 48Vout. To conclude, the wide inverting voltage regulation from −48Vin-dc to 30Vout-dc ∼ 60Vout-dc is experimentally tested.