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用一种新的恒频周期谐振开关代替脉宽调制（ＰＷＭ）开关变换器中的开关单元可得到一类新的准谐振变换器：恒频工作的周期准谐振变换器（Ｃｏｎｓｔａｎｔ－ＦｒｅｑｕｅｎｃｙＣｙｃｌｉｃＱｕａｓｉ－ＲｅｓｏｎａｎｔＣｏｎｖｅｒｔｅｒｓ，简称为ＣＦ－ＣＱＲＣ）。该类变换器工作过程简单，分析设计容易，负载特性良好，并且克服了传统ＱＲＣ可控范围极有限的缺点（因频率可调范围大的ＶＣＯ难以设计）。与调频工作的周期准谐振变换器（ＣＱＲＣ）相比，新的ＣＦ－ＣＱＲＣ因恒频工作而具有更好的控制性能，使优化设计成为可能。
A new type of quasi-resonant converter is obtained by replacing a switching unit in a pulse-width modulation (PWM) switching converter with a new constant-frequency periodic resonant switch: Constant-Frequency CyclicQuasi-Resonant Converters , Abbreviated as CF-CQRC). This kind of converter has the advantages of simple working process, easy analysis and design, good load characteristic, and overcoming the limitation of the traditional QRC controllable range, which is difficult to design due to the VCO with large adjustable frequency range. The new CF-CQRC has better control performance due to constant frequency operation than the quasi-resonant converter (CQRC) for FM operation, making it possible to optimize the design.