Switching power supply technology development trend

Switching power supply is the use of modern electronic technology, the power semiconductor device as a switch, by controlling the switch transistor turn-on and turn-off time ratio ( duty cycle), to adjust the output voltage, maintain stable output power. In the early nineteen eighties computer power supply the full realization of the switching power supply, to complete the computer power generation, enter 90 time switching power supply has been widely used in a variety of electronic, electrical equipment, program-controlled switches, communications, power detection equipment power supply and power supply control equipment. Switching power supply is usually consists of pulse width modulation ( PWM ) control of IC and MOSFET. Switch power supply and linear power supply, the cost as the output power increases, but the growth rate of different. Linear power supply cost in a certain output power point, rather than switching power supply, this point is called cost inversion point. With the development of power electronic technology and innovation, so that the switching power supply technology and constant innovation, this cost point of inversion is to low output power end mobile, thus for the switch power supply to provide a broad space for development.
High frequency switching power supply and its development direction, the high frequency of the switching power supply miniaturization, and causes the switching power supply to enter the more widespread application domain, especially in the high-tech fields of application, to promote the high tech product miniaturization, light. In addition the power switch in the development and application in saving energy, saving resource and protect environment has important significance.
Switching power supply is the development direction of high frequency, high reliability, low power consumption, low noise, interference and modular. As a result of switching power supply of light, small, thin is the key technology of high frequency, so the switching power supply manufacturers are committed in synchronous development of novel intelligent components, especially the improvement of the two rectifier loss, and in the power ferrite ( Mn-Zn ) material to increase scientific and technological innovation, to improve the high frequency and large magnetic flux density ( Bs ) and obtain high magnetic properties, and the miniaturization of capacitor is a key technology. The application of SMT technology makes the switching power supply has made considerable progress, both in circuit board layout components, to ensure that the switch power supply of light, thin. Switch power source high frequency change is bound to the traditional PWM switch technology innovation, to realize ZVS, ZCS soft switching technology has become the mainstream technology of switching power supply, switching power supply and greatly improves the work efficiency. Poetic couplet high reliability index, the United States of the switching power supply manufacturer by reducing the operating current, reduces junction temperature and other measures to reduce the device stress, which improves the reliability of products.
Modularity is the general trend of the development of switch power supply, can use the modular power supply distributed power system, can design N+1 redundant power system, and realize the parallel capacity expansion. The switching power supply running noise this drawback, if only the pursuit of high frequency, the noise will also increases, and partially resonant converter circuit technology, in theory to realize high frequency and noise can be reduced, but part of resonant converter technology application is still a technical problem, it still needs to be undertaken in this area a lot of work, make multinomial technology into practice. Power electronics technology innovation, switching power supply industry has broad prospects for development. Want to accelerate our country switching power supply development speed of the industry must take the road of technological innovation, China 's production and research joint development, as the rapid development of the national economy to make contribution.
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