Power Technology Progress and Application of Power Management

I. INTRODUCTION Electrical energy is currently the most important form of energy in human production and life. The rational, efficient, accurate and convenient use of electrical energy is still a major problem for humanity. Power devices using power electronics technology have brought about the use of electrical energy. In the world, the proportion of total electricity consumption transformed and adjusted by power electronic devices has become an important measure of electricity consumption. At present, the average number of indicators in the world is 40%, according to the National Electric Power Research Institute. It will reach 80% by 2010. This presents new challenges to power technology.

In the 1980s, the concept of power electronics integration in power supply manufacturing was put forward, and it was clarified that integration was the future development direction of power electronics technology, and it was the most promising way to solve the obstacles faced by power electronics technology development. Power ICs have gradually become the dominant devices in power semiconductor devices, pushing power supply technology into a new era of power management. Power management ICs are divided into voltage regulators and interface circuits. It is because so many integrated circuits (ICs) have entered the power supply field that people have more power management to call current power technology.

Second, the progress of power technology Power technology is a multi-disciplinary edge cross technology using power semiconductor devices, integrated power conversion technology, modern electronics technology, automatic control technology. With the development of science and technology, power supply technology is closely related to modern control theory, materials science, electrical engineering, microelectronics, and many other fields. At present, the power technology has gradually developed into a comprehensive multidisciplinary and interdisciplinary technical discipline. It plays a key role in providing high-quality, high-efficiency, and high-reliability power supplies for modern communications, electronic devices, computerization, industrial automation, power engineering, defense, and certain high-tech industries.

In the 40th century, when transistors were introduced in the 40th century, thyristors were introduced on the basis of the maturity of transistors, which opened the prelude to the long-term development of power technology. For half a century, the development of power technology has been continuously innovating.

1. High-frequency transformation is the main source of power technology. The essence of power technology is power conversion. The power conversion technology is used to convert a primary power source such as a commercial power source or a battery into a secondary power source suitable for various types of power consumption. Switching power supply occupies an important position in power supply technology. From high frequency stability to 20kHz, high-capacity, small-size, high-frequency switching power supply with switching frequency of megahertz, it provides a material basis for high-frequency conversion and promotes the development of power supply technology. . The most direct benefits brought by high frequency are the reduction of raw material consumption, miniaturization of power supply devices, improvement of power density, acceleration of system modal responses, further improvement of power supply device efficiency, effective suppression of environmental noise pollution, and wide power supply access. The field, especially the high-tech field, has further expanded its scope of application.

2. New theory, new technology guidance Single circuit buck, boost circuit, resonant conversion, phase-shift resonance, soft-switching PWM, zero-transition PWM and other circuit topology theory; computer-aided design (CAD), power factor correction, active Hoop position, parallel current sharing, synchronous rectification, high-frequency magnetic amplifier, high-speed programming, remote sensing, remote control, computer monitoring and other new technologies, guide the development of power plant technology.

3. New devices, new material support thyristors (SCRs), turn-off thyristors (GTOs), high power transistors (GTRs), insulated gate bipolar transistors (IGBTs), power field effect transistors (MOSFETs), smart ICBTs ( IPM), MOS gated thyristor (MCT), electrostatic induction transistor (SIT), ultrafast recovery diode, non-inductive capacitor, non-inductive resistor, new ferrite, amorphous and microcrystalline soft magnetic alloy, nanocrystalline soft magnetic alloy And other components, equipment, modern power supply technology, and promote the upgrading of power products. Research and development of gallium arsenide (GaAs), semiconductor diamond, and silicon carbide (SiC) semiconductor materials are underway.

4. The intelligent control circuit, drive circuit, and protection circuit of the control use integrated components. The adoption of digital signal processor DSP realizes full digital control. The control means uses a software control method consisting of a microprocessor and a single-chip microcomputer to achieve a higher degree of intelligence and further improve the reliability of the power supply device.

5. The modularization and integration of the power supply circuit The monolithic power supply and the module power supply replace the power supply of the complete machine. The power integration technology simplifies the structure of the power supply. It has been widely used in communications and power, and a new power supply system has been derived. ? Distributed power supply enables a single system of centralized power supply to be diversified. The further development of circuit integration is to do system integration, integrate information transmission, control, and power semiconductor devices all together, increasing reliability.

6, the standard specification of power supply equipment Power supply equipment to enter the market, today's market is beyond the regional integration of global financial integration market, must comply with energy, environmental, electromagnetic compatibility, trade agreements and other common guidelines, power equipment to accept security, EMC, environment, quality system and other standard specifications of the argument.