开关电源设计全过程（Switching power supply design process）.doc

开关电源设计全过程（Switching power supply design process） I. Introduction The switching power supply is the use of modern electronic technology, the control switch turn-on and turn off time ratio, maintain a stable output voltage power supplies, switching power supply from the general pulse width modulation (PWM) control IC and MOSFET. Compared with the linear power supply, the cost of the two increases with the increase of the output power, but the growth rate of the two is different. The cost of a linear power source is higher than the switching power at a point of output power, which is called the cost reversal point. With the development and innovation of power electronics technology, the switching power supply technology is also constantly innovating, and the cost reversal point is moving to the lower output power terminal, which provides a broad space for the development of switching power supply The power supply is like the heart of the human body, the power of all electrical equipment. But the electricity isnt as isolated as the heart. Because the power parameter marker characteristics have power, power, frequency, noise and changes of load parameters and so on; in the same parameter requirements, and volume, weight, shape, efficiency, reliability, people can go to the shape and perfect the power supply, so the power is in the form of A. With the rapid development of power electronic technology, power electronic equipment and the relationship between peoples work and life more closely, and the electronic equipment cannot do without reliable power supply, computer power supply in 80s the full realization of the switching power supply, the completion of the first computer power generation in 90s, switching power supply have entered the field of electronic and electrical equipment. Program-controlled switches, communication, power supply, electronic testing equipment control equipment power supply has been widely used in switching power supply, but also to promote the r