Switching power supply is to use modern power electronic technology, using power semiconductor devices as a switch, through the control switch transistor opened and shut off the time ratio (occupies emptiescompared), adjust the output voltage, maintain stable output of a power supply. In the early 1980 s computer power achieve of switch power supply, the first complete computer power generation, in the 90 s switching power supply has been used in all kinds of electronic,Range hood electrical equipment, pabx, communication, electric power test equipment power and control equipment of power supply. After 30 years of development, China's switch power supply industry has formed its own a sound industrial chain. According to China power supply society statistics, the current domestic production of switch power supply enterprise more than.
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