电源对于各种用电设备的重要性犹如心脏对于人体一般，任何一种用电设备的工作运行都离不开电源供电。电源性能的优劣直接关系到整个电子系统的安全性和可靠性。电子设备的小型化和低成本化使电源以轻、薄、小和高效率为主要发展方向，对电源的要求更加灵活多样。开关频率的持续提高使开关电源的性能得以进一步优化，集成度更高，功耗更低，电路更加简单，工作更加可靠-Power for the importance of the various electrical equipment like heart for the human body in general, the work of running any kind of electrical equipment are inseparable from the power supply. Power performance is directly related to the merits of the safety and reliability of the electronic system. Electronic equipment miniaturization and cost reduction of the power to the light, thin, small, and high efficiency main direction of development of the power requirements more flexible. Continuing to improve the performance of the switching frequency allows the switching power supply could be further optimized, higher integration, lower power consumption, the circuit is more simple, more reliable