【正文】 M]機(jī)械工業(yè)出版社，2022[20]周志敏、周紀(jì)海、紀(jì)愛華編著 開關(guān)電源應(yīng)用電路、電磁兼容、PCB 布線，2022[21]沙占友，2022附 錄附 錄 1：總體電路圖.0 . 3 3F 1V R1LR 1 85 0 kC 1 56 8u fC 1 62 2u f2 2 0vC 10.2u fC20 . 2 u f4 7 m hRC 3u fC 4P T 1U c 3 8 4 261284537R 11 kC60 . 3 3u fR 2 1 0 0 ΩC 1 80 . 0 1 u fR 45 . 1 kC 8 4 1 0 p f / 1.2 v Z D1 1 6 vR 53 3 ΩR 1 91 k R 6 0.5ΩC 9 4 7u fKRAR 7Ω＋1 2v－N4N3 C 1 0 0. 4 7u f R3 . 9 ΩC 1 1 1 0 0 0 u f/ 2 5vC 1 2 0.0 1 u fC 1 3 1 0 0 0 u f / 2 5vL 21 5 0 u HP C 8 1 7R 94 7 0 ΩR 1 14 7 0 ΩR 1 01 kR 1 67.5k R1 5 1 0kC 1 41 u fT L4 3 1 R1 7 4 .7 kC 1 71 0 0 0 u fR 1 91 kC 51 0 0 0u fN 1N 2L 13 . 3 u H＋5 v－0 . 3 3 u f1R 2 02 . 4 k8C 7 0 . 0 1 u fD 1F R 3 0 7D 2 m u r 3 0 2 0D 3D 5 M U R 3 0 2 01 0...R 35 . 1 k附 錄附 錄 2：開關(guān)電源常用英文標(biāo)志與縮寫 AC 交流電AC INPUT (AC IN) 交流輸入CAPACITOR(C) 電容器CIRCUIT 電路CURRENT MONITOR 電流監(jiān)控器DC AMP(DC AMPLIFIER) 直流放大器HIGHPASS FILTER 高通濾波器HALF BRIDGE 半橋LPF (LOWPASS FILTER) 低通濾波器ON/OFF 開/關(guān)OVERSHOOT 過沖ORING DIODE 或二極管OUTPUT POWER RATING 額定輸出功率PCB 印制電路板INDICATING LAMP 信號(hào)燈，指示燈POTENTIOMETER 電位器POWER INDICATOR 電源指示POWER SW 電源開關(guān)POWER TRANSFORMER 電源變壓器POWER OUTPUT 功率輸出POWER SUPPLY 電源(供給)POWER ON/OFF 電源通/ 斷PULSE CLIP 脈沖限幅PRIMARY SIDE 初級(jí)(線圈)PROTECTOR 保護(hù)器POST REGULATOR 二次穩(wěn)壓附 錄外文資料譯文Switching Power Supply DesignSwitching power supply work in high frequency, high pulse state, are analog circuits in a rather special kind. Cloth boards to follow the principle of highfrequency circuit wiring.First, layout: Pulse voltage connection as short as possible, including input switch connected to the transformer, output transformer to the rectifier tube cable. Pulse current loop as small as possible such as the input filter capacitor is returned to the transformer to the switch capacitor negative. Some outended output transformers are the output rectifier to the output capacitor back to transformer circuit X capacitor as close as possible to the input switching power supply, input lines should be avoided in parallel with other circuits, should be avoided. Y capacitor should be placed in the chassis ground terminal or FG connectors. A total of touch induction and transformer to maintain a certain distance in order to avoid magic coupling. Such as poor handling of feeling in between inductor and transformer plus a shield, over a number of EMC performance for power supply to the greater impact. General the output capacitor can be used the other two a close rectifier output terminal should be close to, can affect the power supply output ripple index, two small 附 錄capacitor in parallel results should be better than using a large capacitor. Heating devices to maintain a certain distance, and electrolytic capacitors to extend machine life, electrolytic capacitors is the switching power supply bottleneck life, such as transformers, power control, high power resistors and electrolytic to maintain the distance required between the electrolyte leaving space for heat dissipation , conditions permitting, may be placed in the inlet. Control part to pay attention to: Weak signal high impedance circuit connected to sample the feedback loop as short as in the processing as far as possible avoid interference, the current sampling signal circuits, in particular the current control circuit, easy to deal with some unexpected bad The accident, which had some skill, now to 3843 the circuit example shown in Figure (1) Figure 1 better than Yu Figure 2, Figure 2 Zai full time by observing the current waveform oscilloscope Mingxian superimposed spikes, Youyuganrao limited flow ratio design Zhi Dian low, Figure 1 there is no such phenomenon, there are switch drive signal circuit, switch resistance should be close to the switch driver can switch the work to improve the reliability of this and the high DC impedance voltage power MOSFET driver characteristics.Second, routing Alignment of current density: now the majority of electronic circuit board using insulated copper constitute tied. Common PCB copper thickness of 35μm, the alignment value can be obtained in accordance with 1A/mm experience the value of current 附 錄density, the specific calculations can be found in textbooks. To ensure the alignment principles of mechanical strength should be greater than or equal to the width of (other nonpower supply circuit board may be smaller minimum line width). PCB copper thickness of 70μm is also mon in switching power supply, then the current density can be higher. Add that, now Changyong circuit board design tool design software generally items such as line width, line spacing, hole size and so dry plate Guo Jin Xing parameters can be set. In the design of circuit boards, design software automatically in accordance with the specifications, can save time, reduce some of the workload and reduce the error rate. Generally higher on the reliability of lines or line density wiring can be used double panel. Characterized by moderate cost, high reliability, to meet most applications. The ranks of some of the power module products are also used plywood, mainly to facilitate integration of power devices such as transformer inductance to optimize wiring, cooling and other power tube. Good consistency with the craft beautiful, transformer cooling good advantage, but its disadvantage is high cost, poor flexibility, only suitable for industrial mass production. Singlesided, the market circulation of almost universal switching