Power is the issue of power or energy conversion devices available for people to use. Energy use, is a sign of modern science and technology and social progress of the national economy of modern society, the superstructure of the basic necessities of life are inseparable until the modern power supply, such as culture and entertainment, office learning, scientific research, industrial and agricultural production, national defense, education, environmental protection, health care, transportation, lighting, communications and space exploration, and so on.
     Nature does not directly use the power. Although lightning and other natural phenomena will have a certain power, but so far it is difficult to be used as a power source. Thus, humans are using LED switching power through mechanical, electrical, chemical, nuclear and other conversion came. Usually this category by other energy obtained through the conversion of electrical energy emitted power is called the power, such as generators and batteries. Most of the production of electricity is transmitted from power plants, called the mains.
     Some electrical devices (devices) such as incandescent, electric, AC motors, etc. will be able to work as long as connected to the mains. The computer, TV, X-ray machines and other electronic devices, although with a mains supply, but in these electronic devices are equipped with processing power conversion circuit (device), the sine wave AC power into DC their needs , high-voltage pulse electricity. Unable to provide electricity in islands, the travel, the available battery power conversion obtained through the same AC mains, so that computers and other equipment work properly. Into space satellites, aircraft, solar energy collected, and then through the power conversion, access to a variety of energy needed to maintain the long run. Energy is a precious resource, the need to cherish and savings. Green energy-saving fluorescent lighting, high-efficiency electronic ballasts for HID lamps, is the result of the power supply unit power factor correction and high frequency treatment, not only power but also purify the grid; AC motor input power through frequency conversion, the so-called frequency speed of the motor to run more reasonable energy efficiency. In addition to hydropower, thermal power, nuclear power, solar, wind, biogas, tidal, biomass, such as chemical energy in a particular environment, but also used to generate electricity, as a supplement electricity. These supplemental power to go through DC / DC and DC / AC power conversion to make it easy to store, and convert the grid frequency
Rate consistent sine wave. Electrical equipment grid instability will bring a lot of trouble, and even does not work; the sun, wind and weather affected the season, the electricity generated is unstable, many occasions require regulated power supply, which is also the need for power conversion and adjustment. Power conversion is to convert a form of energy into another form of energy that can be converted between AC and DC, and may be a voltage or current amplitude of the transform or transform the alternating current frequency, phase and the like. In some occasions may simply increase the power conversion stabilize or improve the accuracy of certain properties. Power conversion under circumstances, also the power supply input, which inputs and outputs are
Is the electrical energy conversion power of the power supply is called. This power is the use of power conversion technology mains or battery power is converted into a secondary power system or device suitable for a variety of electrical objects.
     Said power conversion is mainly reflected in the variable voltage regulator rectifier, filter, stable, transform, these basic power conversion is achieved through a series of technical methods, and these methods were applied to different environmental conditions and requirements. From this perspective, power technology is the study of energy conversion technologies.
     1, transformer
     Transformer is the most commonly used AC transformer means, phase control, linear compensation, frequency conversion, and time division (i.e., pulse width modulation PWM) AC transformer, etc. can be achieved. DC transformer is the most common means of DC / DC converter, and passive and active voltage divider is a small power DC transformer common convenient means.
     2, the regulator
     On the basis of the transformer on the plus step and continuous regulator setting can be achieved. If necessary, can be manual, automatic or remote control regulator.
     3, rectifier
     Rectification is the first to convert alternating current into direct current method. Utilizing unidirectional rectifier passive components to achieve the most simple, the use of active switching loss synchronous rectifier rectifier can be minimized.
     4, filter
     Filtering is a unidirectional pulsating current becomes smooth direct process, can be passive or active filter circuit.
     5, stable
     The introduction of automatic negative feedback control method on the power supply unit, can output stable. If the amount of feedback are voltage, current, power, frequency, phase, obtaining the corresponding regulation, steady flow, constant power, frequency stabilization, stable power supply stable phase.
     6. Transform
     Specific meaning transformation is a state transition to another state. For example, the conversion between AC and DC; conversion of light, heat, mechanical, wind, magnetic, and other physical and chemical energy and electrical energy between; sine, square, triangle, trapezoidal wave, pulse wave, special wave waveform conversion.
     Power conversion technology is very much involved, a common parameter regulators, linear feedback regulation, magnetic amplifier, NC regulator, phased, frequency, pulse width modulation (PWM), sinusoidal pulse width modulation (SPWM), soft-switching pulse width modulation, phase resonance, reactive power compensation, power factor correction (PFC), split-phase, current sharing, sensor sampling, drive protection, storage, charging, interference and electromagnetic compatibility. The actual needs of these technologies to promote the continuous development and progress, the power supply unit to meet the different requirements of a variety of loads.
     Power technology development today, a combination of knowledge of electronics, power integration, automation, materials, sensors, computers, electromagnetic compatibility and thermal technology, and many other areas, from the edge of interdisciplinary academic development of unique power (power) electronics.
     Power technology is highly practical technology, services in all areas of a wide variety of industries load, their performance characteristics and techniques vary widely adopted, so the connotation of rain power technology is extremely rich, the book only study describes the common electronic equipment used in power and communications infrastructure related technology power. , Waterproof power supply, LED power adapter, waterproof LED power adapter, LED driver power supplies, transformers, power adapter, waterproof transformer