【毕业论文设计】小功率开关电源外文文献原稿和译文（外文翻译，中英对照）.docVIP

　　w 　　外文文献原稿和译文 　　原 稿 　　Introduction 　　Switching power supply work in high frequency, high pulse state, are analogcircuits in a rather special kind. Cloth boards to follow the principle of high-frequencycircuit wiring. 　　Layout 　　Pulse voltage connection as short as possible, including input switch connected tothe transformer, output transformer to the rectifier tube cable. Pulse current loop assmall as possible such as the input filter capacitor is returned to the transformer to theswitch capacitor negative. Some out-ended output transformers are the output rectifierto the output capacitor back to transformer circuit X capacitor as close as possible tothe input switching power supply, input lines should be avoided in parallel with othercircuits, should be avoided. Y capacitor should be placed in the chassis groundterminal or FG connectors. A total of touch induction and transformer to maintain acertain distance in order to avoid magnetic coupling. Such as poor handling of feelingin between inductor and transformer plus a shield, over a number of EMCperformance for power supply to the greater impact. 　　General the output capacitor can be used the other two a close rectifier outputterminal should be close to, can affect the power supply output ripple index, two smallcapacitor in parallel results should be better than using a large capacitor. Heatingdevices to maintain a certain distance, and electrolytic capacitors to extend machinelife, electrolytic capacitors is the switching power supply bottleneck life, such astransformers, power control, high power resistors and electrolytic to maintain thedistance required between the electrolyte leaving space for heat dissipation ,conditions permitting, may be placed in the inlet. 　　w 　　Control part to pay attention to: Weak signal high impedance circuit connectedto sample the feedback loop as short as in the processing as far as possible avoidinterference, the current sampling signal circuits, in particular the current contro