医用彩超开关电源维修5个要点

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                    <p style="max-width: 100%; min-height: 1em; box-sizing: border-box !important; word-wrap: break-word !important;"><img src="http://mmbiz.qpic.cn/mmbiz/M2H0aGBjWUTRia7nqkArYeKZUqEfdmpNibMPiaZk4gvlWk5v5lUKyXhjJP4CENKQeQt5HI8zwcTCWJOkicfWJiatdJQ/0?wx_fmt=gif" class="" data-ratio="0.10555555555555556" data-w="720" style="line-height: 25.6px; white-space: normal;"  /></p><p style="max-width: 100%; min-height: 1em; box-sizing: border-box !important; word-wrap: break-word !important;">1、修理彩超开关电源时，先用万用表扫描各功率部件一次，看是否击穿短路，比如说电源整流桥堆，开关管，高频大功率整流管；抑制浪涌电流的大功率电阻是否烧断。再检测各输出电压端口的正反向电阻是否异常，上述部件如有损坏则需要重新更换再使用。</p><p style="max-width: 100%; min-height: 1em; box-sizing: border-box !important; word-wrap: break-word !important;"><br style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;"  /></p><p><img data-s="300,640" data-type="jpeg" src="http://mmbiz.qpic.cn/mmbiz_jpg/dx3KibwtDhvcJKl4fsbJlibcpWGzBllklIlib75c0vawgxtpcucC69RDeibgC2QIL2fxMzs06W9gOpRicoKUP4IPnCA/0?wx_fmt=jpeg" class="" data-ratio="0.9949748743718593" data-w="597"  /></p><p style="max-width: 100%; min-height: 1em; box-sizing: border-box !important; word-wrap: break-word !important;"><br style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;"  /></p><p style="max-width: 100%; min-height: 1em; box-sizing: border-box !important; word-wrap: break-word !important;">2、完成了第一步之后，再接通电源后如果还不能正常工作的话，接着要检测脉宽调制组件和功率因数模块，查阅相关资料及引脚功能，熟悉PFC和PWM模块每个脚的功能及其模块正常工作的必备条件。</p><p style="max-width: 100%; min-height: 1em; box-sizing: border-box !important; word-wrap: break-word !important;"><br style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;"  /></p><p style="max-width: 100%; min-height: 1em; box-sizing: border-box !important; word-wrap: break-word !important;">3、然后，对于具有PFC电路的电源则需测量滤波电容两端电压是否为300V左右，如电压为300V左右，说明PFC模块工作是正常的，接着进行检测 PWM组件的工作状态，测量其电源输入端VC ，参考电压输出端VR ，启动控制Vstart/Vcontrol端电压是否正常，利用220VAC/220VAC隔离变压器给彩超开关电源供电，用示波器观测PWM模块CT端对地 的波形是否为线性良好的锯齿波或三角形，如TL494 CT端为锯齿波，FA5310其CT端为三角波。输出端V0的波形是否为有序的窄脉冲信号。</p><p style="max-width: 100%; min-height: 1em; box-sizing: border-box !important; word-wrap: break-word !important;"><br style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;"  /></p><p style="max-width: 100%; min-height: 1em; box-sizing: border-box !important; word-wrap: break-word !important;">4、 在彩超开关电源维修的实践中，有许多彩超开关电源都采用的是UC38××系列8脚PWM组件，大多数彩超开关电源不能工作都是因为电源启动供电电阻损坏，或芯片性能下降。当R开路后无供电，PWM组件无法工作，需更换与原来功率阻值相同的电阻。</p><p style="max-width: 100%; min-height: 1em; box-sizing: border-box !important; word-wrap: break-word !important;"><br style="max-width: 100%; box-sizing: border-box !important; word-wrap: break-word !important;"  /></p><p style="max-width: 100%; min-height: 1em; box-sizing: border-box !important; word-wrap: break-word !important;">5、当滤波电容上无300V左右电压时，说明PFC电路没有正常工作，PFC模块关 键检测脚为电源输入脚VC，启动脚 Vstart/control，CT和RT脚及V0脚。</p><p style="max-width: 100%; min-height: 1em; box-sizing: border-box !important; word-wrap: break-word !important;">总而言之，彩超开关电源无论其结构怎样复杂等情况，但只要抓住其核心的东西，分清个部分功能即充分熟悉彩超开关电源的基本结构以及PWM及PFC模块的特性，它们工作的基本条件，按照上述步骤和方法，多思考动手及细心进行彩超开关电源的维修，就能迅速地排除彩超开关电源故障，达到事半功倍的效果。</p><p style="max-width: 100%; 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