基于自适应延迟时间的软开关电源设计与实现

Design and realization of a soft-switching power based on adaptive delay setting

针对传统软开关控制方法下负载变化时对电路准谐振软开关条件要求的严谨性、抗噪性能差、可靠性低等缺点,对软开关拓扑结构和对整机的保护电路进行了相应的改进和优化设计。采用峰值电流控制模式和斜波补偿原理,选用移相PWM控制芯片UCC3895的自适应延迟时间功能对控制电路进行设计,使软开关的谐振条件较为容易实现且提高了系统的抗干扰性、可靠性。设计一台5 kW的样机进行了实验研究,实验结果表明改进型设计的可行性。

The soft-switching topology circuit and the protection circuit were improved and optimized in this paper to solve the problems of low precision, poor anti-noise performance and low reliability of quasi-resonant soft-switching circuit with the changing of load under the traditional control methods. The peak current control mode, the slope compensation principle and the design of the adaptive delay setting for this chip were used to come over those deficiencies. Finally, a 5 kW prototype was designed to verify the theory index. The results show that the theory is feasible.