Quasiresonant converters (QRCs) are increasingly being used in autonomous power supply systems. These converters are efficient, have small dimensions, and operate stably when the load changes. This study is devoted to the development of a zero-current switching QRC with improved characteristics. The main advantages of this QRC are a wide range of regulation and a low level of output voltage ripple. These advantages are achieved by the recuperation of excess energy due to a transistor shunting the primary winding of a transformer. In this work, a mathematical model of advanced QRC (AQRC) is developed, and the quantitative relationship between the parameters of the AQRC power circuit elements is established. In addition, the electromagnetic processes occurring in the AQRC are studied on the Simulink model. Moreover, the AQRC characteristics for various operating modes are studied, and the rational parameters of its components are determined. Then, an AQRC prototype is created. The tests of the prototype are in good agreement with the models. Results show that the AQRC allows for the adjustment of the output voltage ranging from 0 to 100% of the rated value and has a standard level of electromagnetic compatibility.

准谐振转换器（QRC）越来越多地用于自治电源系统中。这些转换器效率高，尺寸小，并且在负载变化时稳定运行。这项研究致力于开发具有改进特性的零电流开关QRC。该QRC的主要优点是调节范围广，输出电压纹波小。这些优点是通过使晶体管分流变压器的初级绕组而回收多余的能量来实现的。在这项工作中，建立了高级QRC（AQRC）的数学模型，并建立了AQRC电源电路元件的参数之间的定量关系。另外，在Simulink模型上研究了AQRC中发生的电磁过程。此外，研究了各种工作模式下的AQRC特性，并确定了其组成部分的合理参数。然后，创建一个AQRC原型。原型的测试与模型非常吻合。结果表明，AQRC允许在0至100％额定值的范围内调节输出电压，并具有标准的电磁兼容性水平。