Title :
Transient response improvement in isolated DC-DC converter with current injection circuit
Author :
Wang, Xiancheng ; Li, Qingshui ; Batarseh, Issa
Author_Institution :
Dept. of Electr. & Comput. Eng., Univ. of Central Florida, Orlando, FL
Abstract :
Converter transient response is mainly limited by filter LC delay time, controller delay time and propagation delay time. It is a tradeoff between efficiency and transient response in the design. In isolated DC/DC converter, the bandwidth of opto-coupler has an extra strong effect on the system bandwidth improvement. This paper presents current injection method, switching mode current injection circuit only engaged in transient periods operating in high frequency at the secondary side to improve the bandwidth for better dynamic response while the main topology can operate in lower frequency for good efficiency. Simple voltage control for fixed switching frequency and stable operation, instead of hysteretic control, is carried out for current injection circuit. Finally, experimental results are given to verify the theoretical analysis
Keywords :
DC-DC power convertors; delays; magnetic hysteresis; opto-isolators; switching convertors; transient response; voltage control; controller delay time; converter transient response; current injection circuit; current injection method; dynamic response; filter LC delay time; hysteretic control; isolated DC-DC converter; opto-coupler bandwidth; propagation delay time; switching frequency; switching mode current injection circuit; voltage control; Bandwidth; Circuit topology; DC-DC power converters; Delay effects; Filters; Frequency; Propagation delay; Switching circuits; Transient response; Voltage control;
Conference_Titel :
Applied Power Electronics Conference and Exposition, 2005. APEC 2005. Twentieth Annual IEEE
Conference_Location :
Austin, TX
Print_ISBN :
0-7803-8975-1
DOI :
10.1109/APEC.2005.1453045
