DC Characteristics and Stability of Push-Pull and Bridge-Type Zero-Current-Switched Quasi-Resonant Converters

被引：2
|
作者：
Jovanovic, Milan M. [1 ]
Lee, Fred C. Y. [1 ]
机构：
[1] Virginia Polytech Inst & State Univ, Bradley Dept Elect Engn, Virginia Power Elect Ctr, Blacksburg, VA 24061 USA
来源：
IEEE TRANSACTIONS ON POWER ELECTRONICS | 1989年 / 4卷 / 03期
关键词：
D O I：
10.1109/63.39123
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
In the buck-derived, push-pull, and bridge-type topologies the output inductor current during the switched-off interval can freewheel either through the shorted secondaries of the transformer or through a separate freewheeling diode (FWD). It is shown that the former method results in highly nonlinear dc voltage-conversion-ratio characteristics for zero-current-switched quasi-resonant converters operating in half-wave mode. As a result the incremental gain of the power stage of these converters vary in an extremely wide range with input voltage and load. Consequently, it is not possible to achieve a stable feedback control with high loop gains using conventional compensation techniques. The addition of a FWD not only linearizes the dc characteristics but also results in a reduction of current and voltage stresses on semiconductor devices and an improved efficiency.
引用
收藏
页码：339 / 347
页数：9
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