About switching power supply

Switching power supply is the use of modern power electronics technology, control switch turn-on and turn-off time ratio , to maintain a stable output voltage of a power supply, switching power supply usually by a pulse width modulation (PWM) control IC (IC, ie, integrated circuits ) and MOSFET ( genus - oxide - semiconductor - field-effect transistor , called metal oxide semiconductor field effect transistor (Metal-Oxide-Semiconductor Field-Effect Transistor, MOSFET) is a widely available in analog circuits and digital circuits of the field effect transistor (field -effect transistor). MOSFET in accordance with its "channel" of different polarity can be divided into n-type and p-type of MOSFET, usually referred to as NMOSFET and PMOSFET) composition. Switching and linear power compared to both of the costs are increased as the increase of the output power , but the two different growth rates . Linear power output power at a cost point, but higher than the switching power supply , which is called the cost of turning points . With the development of power electronics technology and innovation , making the switching power supply technology is constantly innovating , increasing the cost of reversal point moves to the lower end of the output power , which is the switching power supply provides a broad space for development.

High-frequency switching power supply in the direction of its development , so that high-frequency switching power supply miniaturization and make switching power supply into a wider range of applications, especially in high-tech fields, to promote high-tech products of the small , lightweight technology . Also switching power supply in the development and application of energy conservation , resource conservation and environmental protection aspects are of great significance .

The application of the switching power supply of power electronic devices are diode , IGBT ( insulated gate bipolar transistor ) and MOSFET.
SCR rectifier circuit in the switching power supply input and soft-start circuit has a small amount of application , GTR driver difficulties , the switching frequency is low, gradually being replaced by IGBT and MOSFET .

Switching power supply of the three conditions
1, the switch: power electronic devices work in the off state, rather than linear state
2 , HF: high frequency power electronic devices operating in the frequency rather than close to the low-frequency
3 , DC : switching power supply output is a DC rather than AC

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