目前,在20W以上的电子设备中,电子开关电源以体积小、性能可靠、转换速率高及对电网适应性强等优点,逐渐取代了传统的串联线性稳压电源,被广泛用于电视机、计算机、通讯系统及医疗设备中。但在20W以下的电子设备中,稳压电源部分仍常采用矽钢片铁芯变压器——整流——线性稳压这一方案。原因是20W以下的 At present, the electronic switching power supply has gradually replaced the traditional series linear regulated power supply in the electronic devices with a power of more than 20W because of its small size, reliable performance, high conversion rate and strong adaptability to the power grid. The electronic switching power supply is widely used in televisions, Computer, Communication System and Medical Equipment. However, in the following 20W electronic equipment, the constant voltage power supply parts are still often using silicon steel core transformer - rectifier - linear regulators this program. The reason is below 20W