Power electronics technology is an emerging technology, power electronics technology has entered a new era since the 1980s, it is by electricity, electronics and control theory, three interdisciplinary from Electric Automation has become aa professional basis is strong and closely associated with the production of indispensable professional basis.
 
This new technology is used in the power field of expertise, reflecting the weak control of the strong power, but also highly practical. Be able to integrate theory with practice, plays an important role in developing automation professionals. It includes the structure and classification of thyristor, thyristor overvoltage and overcurrent protection, controlled rectifier circuit, the thyristor active inverter circuit, thyristor passive inverter circuit, the PWM control technology, AC voltage regulator, DC chopper and inverter circuit works.

Controllable rectifier circuit in power electronics technology, is a very important chapter, the rectifier circuit to alternating current into direct current circuits, its application is very extensive.

Large number of industrial application of a variety of DC motor speed control with power electronic devices; Electrified Railway (electric locomotives, Maglev trains, etc.), electric vehicles, aircraft, ships, elevators and other means of transport is also widely used in the rectifier power electronics technology; the DC power used by a variety of electronic devices, such as program-controlled switches in the communications equipment, the required power of mainframe computers, microcomputers inside the power supply can take advantage of the rectifier circuit consisting of a DC power supply can be said that where there is electricity power electronic technology equipment.

With the intelligent progress of power electronics technology, power electronics, electronic device manufacturing technology exchanges. Microelectronic technology and power electronics technology integration, to a certain extent, information processing and power handling one, its development may lead to a major reform of the electronic technology.