AC Partial Power Processing for Bidirectional dc-dc Conversion with Wide Output Voltage Regulation

Partial power processing (PPP)–based dc-dc converters offer high efficiency and low device stress but typically require additional inverter and rectifier stages, leading to increased component count and degraded performance under wide voltage regulation. This Letter first introduces the concept of AC partial power processing (AC-PPP), and based on this, proposes an AC-controlled bidirectional partial power converter (AC-BPC). By regulating the partial power ratio between the master and slave inverters through AC-side voltage control, the proposed converter achieves wide voltage gain range and load range. In addition, the AC-BPC eliminates the extra rectification stage, inherently provides galvanic isolation, and facilitates effective inrush current suppression, thereby improving power density and reliability. A 400V CLLC prototype for on-board chargers validates the proposed architecture, delivering a 200–800 V output range and a peak efficiency of 97.98%. © 2026 IEEE.