Switching Power Supplies and Classification and Applications
With the development of power electronics technology, power electronic equipment and people's work and life is increasingly close, and electronic equipment are inseparable from a reliable power supply, into the 80's computer power supply to achieve a comprehensive switching power supply, the first to complete the computer's power supply replacement, into the 90's switching power supply into a variety of electronic, electrical equipment, programme-controlled exchanges, communications, electronic testing equipment, power supply, Control equipment power supply has been widely used switching power supply, more switching power supply technology to promote the rapid development. Switching power supply is the use of modern power electronics technology, control the switching transistor turn on and off time ratio, to maintain a stable output voltage of a power supply, switching power supply is generally by the pulse width modulation (PWM) control IC and MOSFET composition. Switching power supply and linear power supply compared to the cost of both with the increase in output power and growth, but the rate of growth of the two are different. Linear power supply cost at a certain output power point, but higher than the switching power supply, this cost reversal point. With the development of power electronics technology and innovation, so that the switching power supply technology in the continuous innovation, this cost reversal point increasingly to the low output power end of the move, which provides a wide range of switching power supply development space!
