Title :
On/off control of a modular DC-DC converter based on active-clamp LLC modules
Author :
Hien Nguyen ; Maksimovic, Dragan ; Zane, Regan
Author_Institution :
Colorado Power Electron. Center, Univ. of Colorado Boulder, Boulder, CO, USA
Abstract :
This paper studies on/off control of a dc-dc system that contains multiple active-clamp LLC resonant modules operating in parallel. The architecture and the on/off control method yield high overall efficiency and fast transient responses. Two converter models are introduced for different purposes: (1) a high-frequency model to determine a gate timing sequence that enables fast on/off control, and (2) an averaged model to assist in the system control loop design. The models and the on/off control method are verified by experiments on a 1 MHz, 24 V-to-3.3 V, 5.5 W active-clamp LLC module prototype. The performance of PI and PID system controllers is analyzed and compared by simulations of a twenty-module system.
Keywords :
DC-DC power convertors; PI control; control system synthesis; on-off control; resonant power convertors; three-term control; transient response; PI system controllers; PID system controllers; control loop design; fast transient responses; frequency 1 MHz; gate timing sequence; high-frequency model; modular dc-dc converter; multiple active-clamp LLC resonant modules; on-off control method; power 5.5 W; twenty-module system; voltage 24 V to 3.3 V; Clamps; Load modeling; Logic gates; Pulse width modulation; Steady-state; Switches; Timing;
Conference_Titel :
Control and Modeling for Power Electronics (COMPEL), 2013 IEEE 14th Workshop on
Conference_Location :
Salt Lake City, UT
Print_ISBN :
978-1-4673-4914-7
DOI :
10.1109/COMPEL.2013.6626413
