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led开关电源电路设计注意事项是什么

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led开关电源电路设计注意事项是什么

浏览：50次 | 提问时间： 08-07 03:04

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4个答案

青春荒唐我不负你 08-07 03:04

一、在安装完毕通电试运行之前，请再次检查和校对各接线端子上的连线，确信输入和输出，交流和直流，单相和多相、正极和负极、电压值和电流值等正确无疑，方可通电运行。二、为达到充分散热的效果，一般要安装在空气对流条件好的位置或安装在机箱壳体上通过壳体将热传出去。三、金属外壳电源线与外壳一般与地（FG）连接，要可靠接地，以确保安全，不可误将外壳接在零线上。四、对电源FG未接地的用户，手摸外壳或输出有麻电感觉属正常现象，浮地时FG对大地有110V左右交流电输出，这是电源内部结构决定的。五、对于大功率LED开关电源，一般均有三个或三个以上的“+”输入端子和“-”输出端子，实际上它们同属一个输出电极，只是为了使用户接线方便，而将多个端子分别在内部并接在了一起。六、LED开关电源出厂以前加阻性负载，如需用在容性或感性为负载时，应事先在订货时加以说明。七、对于双路输出对称用负载，优先选用对称输出电源。八、AC输入电源的定义输入电源

失心疯 08-07 03:13

输出功率/（输入电压*功率因数*效率）九、汇漏电流：多台电源在使用时，共同摄入同一接地点，总的泄漏电流是由每个单元的泄漏电流相加构成，届时要检查保护接地线的可靠性及接地电阻是否达到要求，以免遭电击。

姑娘我百毒不侵为何流泪 08-07 03:21

一、从原理图到PCB的设计流程   建立元件参数－>输入原理网表->设计参数设置->手工布局->手工布线->验证设计－>复查->CAM输出。　　二、参数设置相邻导线间距必须能满足电气安全要求，而且为了便于*作和生产，间距也应尽量宽些。最小间距至少要能适合承受的电压，在布线密度较低时，信号线的间距可适当地加大，对高、低电平悬殊的信号线应尽可能地短且加大间距，一般情况下将走线间距设为8mil。

怪我不够好 08-07 03:29

1、不能用自来水管作为接地线。新建住宅楼都配置了可靠的接地线。而对于老式住宅，不少人就以自来水管作为接地线，这是不可靠的危险作法。　　2、浴室应采用等电位联结。浴室环境潮湿，人即使触及50V以下的安全电压，也有遭电击的可能。等电位联结，就是把浴室内所有金属物体（包括金属毛巾架、铸铁浴缸、自来水管等）用接地线连成一体，并且可靠接地。　　3、接地制式应与电源系统相符。电气设计前，必须先了解住宅电源来自何处，以及该电源的接地制式。接地保护措施应与电源系统一致。　　4、有些人认为：接地线中的电流很小，几个回路合用一根接地线可节约费用。这是错误的。因为在正常工作时，接地线中的电流的确很小，但在发生短路故障时，接地线中流过的电流大大超过相线正常工作时的电流。另外，从可靠性考虑，一个回路一根接地线更可靠。

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