Transistors to integrated circuits at the core of the formation of the micro-electronic information processing technologies and to the formation of SCR as the core of the power of electronic processing of semiconductor technology constitute the traditional power electronic systems, with the development of technology and the advent of a new generation of devices , Makes power conversion circuits and electronic control system innovation. , A wide range of PWM (PWM) circuit, zero current, zero-voltage switch resonant circuits and high-frequency chopper circuit, etc., have become modern power electronics technology an important component part. Its applications involving automation, defense, aerospace, transportation, energy, and environmental protection. Power Electronics led the development of the power of technology development, and the power of technology to effectively promote the development of power industry development. So far power has become a very important foundation for science, technology and industry, and widely used in various industries, the development trends of high-frequency, diversity, modular, green, efficient, digital. This article discusses the power of electronic systems from traditional to modern power and the development process, highlighted the power of modern electronic applications, the last of the development trend of switching power supply. Transistor integrated circuits Transistor integrated circuits Information Processing Information Processing Microelectronics Technology Microelectronics Technology SCR Thyristor Power processing power handling Semiconductor Electronics Semiconductor Electronic Technology Traditional power electronic systems Traditional power electronic system A new generation of devices A new generation of devices Power Electronics transform circuit Power Electronics transform circuit Pulse width modulation circuit Pulse width modulation circuit Zero-current zero-current Zero-Voltage Zero-Voltage Switching resonance circuit Switching resonance circuit High-frequency chopper circuit High-frequency chopper circuit The power of modern electronic technology Modern power electronics technology To automation - - environmental Automation, defense, aerospace, transportation, energy, Environmental protection Power Electronics Power Electronics Technology Power Technology Power Technology Power Industry Power Industry High-frequency - Digital High-frequency, diversity, modular, green, efficient, digital