关于开关电源技术.doc

360毕业设计网友情提供 www. bys j360? com 英文 About The Switching Power Supply Technology In the electric power electronic technology application and in each kind of electricsl power system, the switching power supply technology is at the core position. Mentions the analogous circuit this noun, perhaps many people will feel strange, but you certainly have heard the megaphone. When we in big conference site, clearly hears from the speaker to treat the sound which the microphone sends out, the speaker the reason that can make the very big sound, first depends on one kind to be able to make the keen response to the sound sensitive gas. It can transform the sound to the voltage signal, again passes through the enlargement electric circuit, the input signal will turn the high efficiency the output signal. Tn the speaker makes the very strong sound is not the sound simple expansion ? Two is but is with the small input signal, enlarges the electric circuit through the transistor to control the energy size which the power source provides. The big output signal obtains in the output load. There are many types of electrical and electronic power supplies, providing various alternating current AC and direct current DC voltage for equipment operation . DC voltages are needed for most electronic circuits, and generally an electronic power supply is considered as a device that converts AC into DC. The AC voltage from the power lines can be rectified directly or passed through an isolation transformer. Depending on the value of DC voltage needed, the transformer may be of either a step-up or step-down type. After the transformer, the AC is rectified into pulsating DC by diodes in the form of a half-wave rectifier, a full-wave rectifier, or a bridge full-wave rectifier. The pulsating DC is then filtered or smooth out by capacitors, indue to rs, and resistors so as to produce a constant DC out put. Sing-phase power what you have in your house. You generally talk about household electrical serv