论文信息 - A zero-current-switched off-line quasi-resonant converter with reduced frequency range: analysis, design, and experimental results

A zero-current-switched off-line quasi-resonant converter with reduced frequency range: analysis, design, and experimental results

A half-bridge zero-current-switched (ZCS) offline quasi-resonant converter (QCR) operating in full-wave mode is implemented to reduce the modulation frequency range due to load variations. The design and characteristics of the converter are described and compared with their half-wave counterpart in frequency range, component stress, and efficiency. An experimental converter which delivers output power from 10 to 100 W with a modulation frequency from 700 kHz to 1.4 MHz is presented. The converter showed superior transient response compared to the corresponding half-wave converter. The efficiency of the full-wave converter at full-load was several percent lower than that of the half-wave converter and decreases at a much faster rate as the output power decreases. >

F. Lee | Dan Y. Chen | M. Jovanovic

[1] Milan M. Jovanovic,et al. State-Plane Analysis of Quasi-Resonant Converters , 1985, INTELEC '85 - Seventh International Telecommunications Energy Conference.

[2] Albert Man,et al. Low-profile high-frequency off-line quasi-resonant converter , 1987, 1987 IEEE Applied Power Electronics conference and Exposition.

[3] M. Jovanovic. High-frequency off-line power conversion using quasi-resonant and multi-resonant techniques , 1988 .

[4] V. Vorperian,et al. Equivalent circuit models for resonant and PWM switches , 1989 .

[5] Fred C. Lee,et al. Hybridized off-line 2-MHz zero-current-switched quasi-resonant converter , 1989 .

[6] Fred C. Lee,et al. Evaluation and design of megahertz-frequency off-line zero-current-switched quasi-resonant converters , 1989 .