Abstract
This paper presents an on-chip voltage mode control (VMC) circuit regulating the converter output voltage to tolerate input voltage and load current disturbances for a closed-loop converter system. The proposed VMC topology is implemented in a zero voltage switching (ZVS) pulse width modulation (PWM) phase-shifted full-bridge (PSFB) dc-dc bus converter with enhancement-mode gallium nitride (e-mode GaN) power transistors. The VMC block regulates the output voltage by tuning the phase relationship of the gate driving signals for the converter. The operation mode switch helps the converter to realize automatic working-mode conversion between hard-and soft switching. The proposed initial fixed delay generator limits the maximum output voltage overshoot when the converter works in the start-up stage. The feedback circuit and other modules were implemented in a 1-μm 650V Trench Isolated BCD technology, demonstrating the full functionality of all the blocks.
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