The switch frequency of the direct power control system using hysteresis comparator is not fixed, which is a technical issue in practical needing be solved.
采用滞环比较器的直接功率控制系统的开关频率不固定，是实用化过程中需要解决的一个技术问题。
The fixed frequency sample PWM method is put forward in this paper together with the theoretical analysis about their switch strategy.
本文提出恒频采样电流跟踪型PWM方式，并对其开关策略进行了理论分析。
Besides switching at a fixed frequency for Flyback converters, quasi-resonant mode is widely used due to its lower switch-on losses and better EMI performance.
除了工作在固定的开关频率模式外，由于更小的开通损耗和更好的EMI性能，准谐振工作模式在反激式变换器中得到较广泛的应用。
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