Title :
A novel current-limiting method for LLC DC/DC resonant converter
Author :
Feiyue Duan ; Ming Xu ; Xu Yang ; Yuan Yao
Author_Institution :
POWER Electron. & RENEWABLE ENERGY Res. CENTER, XI´AN JIAOTONG Univ., Xi´an, China
Abstract :
Constant current control is a difficult issue for LLC resonant converter due to its variable frequency operation. After detailed analysis on the short circuit operation of conventional LLC DC-DC converter, a novel current-limiting method with the help of diode clamping is proposed. Against the conventional wisdom, the switching frequency is reduced toward zero to control the output current under over-load and short circuit condition ultimately. By doing so, the ultra-high frequency operation can be avoided for current-limiting at short circuit. A 480W 12V/40A prototype with proposed concept has been built to verify the theoretical analysis.
Keywords :
DC-DC power convertors; LC circuits; current limiters; electric current control; resonant power convertors; short-circuit currents; voltage control; LLC DC-DC resonant converter; constant current control; current 40 A; current limiting method; diode clamping; over load condition; power 480 W; short circuit condition; switching frequency; variable frequency operation; voltage 12 V; Capacitors; Clamps; Control systems; RLC circuits; Resonant frequency; Switching frequency; Topology; Current-limiting; Resonant converter;
Conference_Titel :
Power Electronics and Applications (EPE'14-ECCE Europe), 2014 16th European Conference on
Conference_Location :
Lappeenranta
DOI :
10.1109/EPE.2014.6910749
