Novel Master/Slave Configurated Closed Loop Regulated Modular 320kW Isolated Symmetric CLLC Resonant DC/DC Converter

• Published in: 2020 IEEE 21st Workshop on Control and Modeling for Power Electronics (COMPEL) pp. 1 - 8
• Main Authors: Badiger, Nagendra, Hagel, Florian, Winzer, Patrick, Schmitt, Alexander, Hammerer, Horst
• Format: Conference Proceeding
• Language: English
• Published: IEEE 09.11.2020
• Subjects: CLLC resonant converter; Control systems; DCCC; EME; Master slave configuration; Modular converter cluster; multi power path; OFC; Phase modulation; PHIL; Resonant converters; smaller hardware footprint; Soft switching; Switching frequency; Voltage control; Voltage measurement
• DOI: 10.1109/COMPEL49091.2020.9265842

A phase shift modulation based closed loop voltage regulation and current balance scheme is proposed for a high power, modular, multi-power path symmetric isolated bidirectional capacitor-inductor-inductor-capacitor (CLLC) resonant DC/DC converter. Novel master/slave configuration facilitates connection of multiple symmetrical CLLC DC/DC converters either in parallel and/or in series combination to increase the voltage and current rating of the converter cluster. The unique daisy chain formation using optical fiber communication allows connection of up to 4 DC/DC converters in one converter cluster. The proposed control scheme is simulated in Matlab/Simulink©, the dynamic and endurance tests (750hours) carried out on the built 1200V-320kW hardware validates the proposed scheme. The soft switching at a high frequency makes the converter to operate with higher efficiency (up to 98%) at full load, while assuring smaller hardware footprint.