Power electronics began to boarded the modern electric drive technology arena, as a basis for the development of SCR rectifier device is a revolution in the field of electrical transmission, the transformation of electrical energy and system from rotating converter and static ion converter into In the age of converters made up of power electronics, this marks the birth of power electronics. 1 Overview Since the advent of the first thyristor in the 1950s, power electronics began to take the stage of modern electric drive technology. Based on this, the thyristor rectifier was a revolution in the field of electric transmission, And controlling the time from the rotary converter and the stationary ion converter into the converter constituted by the power electronics, this marks the birth of power electronics. Into the 70's thyristor began to form a series of products from low voltage and low current to high voltage and high current, the ordinary thyristor can not self-turn off semi-controlled devices, known as the first generation of power electronic devices. With the continuous improvement of theoretical research and manufacturing technology of power electronics, power electronics have made great progress in terms of ease and type, etc. They are another leap forward in power electronics and have developed the GTR.GTO and power MOSFET since Turn off the full control of the second generation of power electronics. The third generation of power electronic devices represented by Insulated Gate Bipolar Transistor (IGBT) has started to develop in the direction of easy high frequency, fast response and low loss. And into the 90's power electronic devices are moving in the direction of modular, modular, intelligent, power integration direction, as a basis for the formation of a theoretical study of power electronics technology, device development, application of penetration in the international On the power electronics technology is the most competitive high-tech fields. 2 Power Electronics Development Review Rectifier is the most simple structure of the power electronic devices, the most widely used a device. Has formed a common type, fast recovery and Schottky three series of products, power rectifier to improve the performance of various power electronic circuits, reducing circuit losses and improve current efficiency and so has a very important role. Since 1958 GE of the United States developed the first general-purpose industrial thyristor, the structural improvement and process reform laid the foundation for the development of new devices, developed in the next decade two-way, inverter, inverse Guide, asymmetric thyristor, thyristor products so far there is still a more extensive market. In the United States in 1964 the first successful trial of the 0.5kV / 0.01kA turn off the GTO so far, with currently up to 9kV / 0.25kA / 0.8kHz turn off the GTO so far, up to now 9kV / 2.5kA / 0.8 kHZ and 6kV / 6kA / 1kHZ level, in the current variety of self-turn off devices GTO maximum capacity, but its lowest operating frequency, but it has obvious advantages in high-power electric traction drive, so it in the medium voltage, Large amount of space in the area of ​​a place. 70s developed GTR series, its rating has reached 1.8kV / 0.8kA / 2kHZ, 0.6kV / 0.003kA / 100kHZ, which has the composition of the circuit flexible and mature, small switching losses, short switching times and other characteristics of the medium capacity , Medium frequency circuit widely used, and as a high-performance, high-capacity third generation insulated gate bipolar transistor IGBT, because of its voltage control, input impedance, drive power, low switching loss and operating frequency Higher characteristics, which has a broad development prospects. The IGCT is a new device developed recently. It is a device developed on the basis of GTO, called integrated gate commutated thyristor, also known as the emitter turn-off thyristor, its instantaneous switching frequency up to 20kHZ, off Off time is 1μs, dildt4kA / ms, du / dt10-20kV / ms, AC blocking voltage 6kV, DC blocking voltage 3.9kV, switching time <2ks, conduction voltage drop 3600A, 2.8V, switching frequency> 1000Hz. 3 power electronics development trend Into the 90's power electronics research and development, has entered the high-frequency, standard modular, integrated and intelligent era. From the theoretical analysis and experiments show that the reduction of electrical product size and weight inversely proportional to the square root of the supply frequency, that is to say, when we greatly improve the 50Hz standard two-frequency, the use of such frequency electrical equipment volume and weight It can greatly reduce the electrical equipment manufacturing material savings, more energy-saving operation, equipment, system performance is greatly improved, especially for the space industry, its significance is very far-reaching. Therefore, high-frequency power electronics is the future direction of power electronics technology innovation, and the standard hardware module structure is the inevitable trend of development of the device, the current advanced modules, including the switching element and its parallel reverse freewheeling diode Within and drive protection circuit of multiple units, and to standardize and produce a series of products, and can be achieved in the consistency and reliability of a very high level. At present, many large companies in the world have developed IPM intelligent power modules, such as Japan Mitsubishi, Toshiba and the United States International Rectifier has a mature product launch. Japan's new electric company's IPM intelligent power module's main features are: 3.1 It integrates the power chip, the detection circuit and drive circuit, so that the structure of the main circuit for the most simple. 3.2 Its power chip uses a high switching speed, low drive current IGBT, and comes with current sensors, can effectively detect overcurrent and short circuit current to the power chip with a safe protection. 3.3 The internal wiring on the power circuit and drive circuit wiring length control to a minimum, so as to solve the surge voltage and noise effects of misoperation and other issues. 3.4 comes with reliable safety protection measures, when the fault occurs in time to shut down the power device and issue a fault signal, the chip implementation of dual protection to ensure the reliability of its operation. 4 power electronics technology innovation At the end of 1998, Premier Zhu Uji clearly pointed out that in the future it is imperative to speed up the construction of a national innovation system. Therefore, we can affirmatively say that in the national development in the early 21st century, technological innovation will become the dominant part of the work of enterprises, and the development and establishment of a system suitable for China National electrician technological innovation mechanism, through the great advances in power electronics technology to promote the new electrical industry to upgrade and progress and then to the world. Although power electronics has many common features of microelectronic technology, such as rapid development and change, outstanding penetration and innovation performance, exceptionally strong vitality, position in the sunshine industry and new opportunities arising from the integration and development with other disciplines , And power electronics technology has its own unique features such as high voltage, large capacity and control of the power range, so the difficulty of technological innovation lies in the need to cross the high voltage and high power of this level, and its comprehensive technical difficulty , Such as the material industry and manufacturing process, and the reliability of the work of power electronic devices is one of its extremely important technical indicators. For this reason, the innovation of power electronics technology is interoperable with a variety of disciplines and has a strong permeability to various industrial fields. Therefore, the power electronics technology and the country's basic industries are closely related, and with the national development policies and industrial policies matching the requirements of the 21st century will become more and more intense. Power electronics technology, also known as power flow technology, power electronics technology Construction Decoration Bracket We can make different kinds of Decoration Mount Bracket,Ornamental Shelf Brackets,Ribber Mounting Bracket,Right Angle Bracket,Black Bracket,Plaster Mounting Bracket, for you. Plaster Mounting Bracket,Decoration Mount Bracket,Ornamental Shelf Brackets,Ribber Mounting Bracket,Right Angle Bracket,Black Bracket,Clip MGX Metalworks Co., Ltd. , https://www.metal-mgx.com