Switching power supply work in high frequency, high pulse state, are analog circuits in a rather special kind. Cloth boards to follow the principle of high-frequency circuit wiring.

1, 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 out-ended 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 magnetic 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 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.
開關(guān)電源狀態(tài)，電源工作在高頻率，高脈沖的模擬電路的一個比較特殊的一種。布板布線原則遵循高頻電路。
1，布局：
脈沖電壓連接盡可能短，包括輸入開關(guān)連接到變壓器，輸出變壓器的整流管電纜。脈沖電流回路盡可能小，如輸入濾波電容的負(fù)返回變壓器開關(guān)電容器。一些外端輸出變壓器是輸出整流器的輸出電容回變壓器電路X關(guān)閉電容器盡可能輸入開關(guān)電源，輸入線應(yīng)避免與其他電路中平行，應(yīng)該避免。Y電容應(yīng)放置在機(jī)箱的接地端子或fg連接器。一個變壓器總的觸摸感應(yīng)，并保持一定的距離，以避免磁耦合。如處理不當(dāng)影響較大的感覺電感器和變壓器之間加一屏蔽，過一個數(shù)字的EMC性能的電源。
總的輸出電容可以使用的其他兩個緊密整流器輸出端應(yīng)接近，可能會影響電源的輸出紋波指標(biāo)，結(jié)果兩個小電容并聯(lián)電容器應(yīng)該比使用大。暖氣設(shè)備要保持一定的距離，電解電容，延長機(jī)器壽命，鋁電解電容器是開關(guān)電源的瓶頸生活熱，如變壓器，電源控制，高功率電阻器和電解空間的距離為維持電解質(zhì)之間需要離開耗散，條件允許的話，可能被放置在入口。
控制部分要注意：高阻抗電路連接到樣品的反饋回路短弱信號處理中盡量避免干擾，電流采樣信號的電路，特別是電流控制電路，容易處理一些意想不到壞的事故，其中有一些技巧，現(xiàn)在3843的電路示例如圖（1）圖1 2比于圖，圖2再疊加尖峰全職通過觀察電流波形示波器暹，Youyuganrao有限的流量比設(shè)計志滇低，圖1有沒有這樣的現(xiàn)象，有開關(guān)驅(qū)動信號的電路，開關(guān)電阻應(yīng)接近開關(guān)驅(qū)動器可以切換工作，提高可靠性的特點，這和高直流阻抗電壓功率MOSFET驅(qū)動器。
二，路徑
對準(zhǔn)電流密度：現(xiàn)在大部分的銅電子絕緣電路板使用構(gòu)成并列。常見的PCB銅層厚度35μm，對齊值可1A/mm經(jīng)驗，按照目前的密度值，具體計算可以發(fā)現(xiàn)教科書。為了確保機(jī)械強度的對齊原則應(yīng)大于或等于0.3毫米寬（其他非電源電路板可能會更小的最小線條寬度）。PCB的厚度為70μm銅也是常見的開關(guān)電源供應(yīng)，則電流密度可以更高。
補充一點，現(xiàn)在長永電路板設(shè)計工具設(shè)計軟件性參數(shù)，一般的項目，如線寬，線間距，孔大小等干板過幾嗯可以設(shè)置。在電路板的設(shè)計，軟件設(shè)計規(guī)格自動根據(jù)，可以節(jié)省時間，減少工作量，減少一些錯誤率。
一般布線的密度更高的可靠性線或行可用于雙面板。其特點是價格適中，可靠性高，能滿足大多數(shù)應(yīng)用。