医用彩超开关电源维修几个要点

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                    <p><img src="http://mmbiz.qpic.cn/mmbiz/M2H0aGBjWUTRia7nqkArYeKZUqEfdmpNibMPiaZk4gvlWk5v5lUKyXhjJP4CENKQeQt5HI8zwcTCWJOkicfWJiatdJQ/640?wx_fmt=gif" data-type="gif" class="" data-ratio="0.10555555555555556" data-w="720"  /></p><p><span style="font-size: 12px;color: rgb(178, 178, 178);">来源：医疗维修帮</span><br  /></p><p><span style="font-size: 12px;"><br  /></span></p><p><span style="font-size: 12px;"></span></p><p style="max-width: 100%;min-height: 1em;color: rgb(51, 51, 51);font-family: 微软雅黑;font-size: 17px;letter-spacing: 0.544px;text-align: justify;white-space: normal;background-color: rgb(255, 255, 255);box-sizing: border-box !important;word-wrap: break-word !important;"><img class="" data-ratio="0.5561694290976059" data-s="300,640" src="http://mmbiz.qpic.cn/mmbiz/qbiclCHl7mOGYmKs7DMUmPVaiaiaftFVEUscozrxBKIkjAvUIOH51Q6vH861vrJtgWHLPJs5oORpNWppPXc6GKkLQ/640?wx_fmt=png" data-type="png" data-w="543" style="box-sizing: border-box !important;word-wrap: break-word !important;width: auto !important;visibility: visible !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;color: rgb(51, 51, 51);font-family: 微软雅黑;font-size: 17px;letter-spacing: 0.544px;text-align: justify;white-space: normal;background-color: rgb(255, 255, 255);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;color: rgb(51, 51, 51);font-family: 微软雅黑;font-size: 17px;letter-spacing: 0.544px;text-align: justify;white-space: normal;background-color: rgb(255, 255, 255);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;color: rgb(51, 51, 51);font-family: 微软雅黑;font-size: 17px;letter-spacing: 0.544px;text-align: justify;white-space: normal;background-color: rgb(255, 255, 255);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;color: rgb(51, 51, 51);font-family: 微软雅黑;font-size: 17px;letter-spacing: 0.544px;text-align: justify;white-space: normal;background-color: rgb(255, 255, 255);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;color: rgb(51, 51, 51);font-family: 微软雅黑;font-size: 17px;letter-spacing: 0.544px;text-align: justify;white-space: normal;background-color: rgb(255, 255, 255);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;color: rgb(51, 51, 51);font-family: 微软雅黑;font-size: 17px;letter-spacing: 0.544px;text-align: justify;white-space: normal;background-color: rgb(255, 255, 255);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;color: rgb(51, 51, 51);font-family: 微软雅黑;font-size: 17px;letter-spacing: 0.544px;text-align: justify;white-space: normal;background-color: rgb(255, 255, 255);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;color: rgb(51, 51, 51);font-family: 微软雅黑;font-size: 17px;letter-spacing: 0.544px;text-align: justify;white-space: normal;background-color: rgb(255, 255, 255);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;color: rgb(51, 51, 51);font-family: 微软雅黑;font-size: 17px;letter-spacing: 0.544px;text-align: justify;white-space: normal;background-color: rgb(255, 255, 255);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;color: rgb(51, 51, 51);font-family: 微软雅黑;font-size: 17px;letter-spacing: 0.544px;text-align: justify;white-space: normal;background-color: rgb(255, 255, 255);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;color: rgb(51, 51, 51);font-family: 微软雅黑;font-size: 17px;letter-spacing: 0.544px;text-align: justify;white-space: normal;background-color: rgb(255, 255, 255);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;color: rgb(51, 51, 51);font-family: 微软雅黑;font-size: 17px;letter-spacing: 0.544px;text-align: justify;white-space: normal;background-color: rgb(255, 255, 255);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><span style="font-size: 12px;"><br  /></span></p><p><span style="font-size: 12px;"><br  /></span></p><p style="margin-bottom: 5px;max-width: 100%;min-height: 1em;letter-spacing: 0.544px;color: rgb(62, 62, 62);font-size: 16px;text-align: center;font-family: 微软雅黑;line-height: 2em;box-sizing: border-box !important;word-wrap: break-word !important;">赞<span style="max-width: 100%;line-height: 25px;box-sizing: border-box !important;word-wrap: break-word !important;">是一种友谊 |&nbsp;</span><span style="max-width: 100%;line-height: 25px;color: rgb(192, 0, 0);box-sizing: border-box !important;word-wrap: break-word !important;"><strong style="max-width: 100%;box-sizing: border-box !important;word-wrap: break-word !important;">分享</strong></span><span style="max-width: 100%;line-height: 25px;box-sizing: border-box !important;word-wrap: break-word !important;">传递智慧</span></p><p style="margin-bottom: 5px;max-width: 100%;min-height: 1em;letter-spacing: 0.544px;color: rgb(62, 62, 62);font-size: 16px;text-align: center;font-family: 微软雅黑;line-height: 2em;box-sizing: border-box !important;word-wrap: 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100%;color: rgb(95, 73, 122);font-size: 14px;line-height: 24.381px;text-align: justify;box-sizing: border-box !important;word-wrap: break-word !important;"><span style="max-width: 100%;font-size: 18px;color: rgb(62, 62, 62);line-height: 25px;text-align: center;box-sizing: border-box !important;word-wrap: break-word !important;"><strong style="max-width: 100%;white-space: normal;font-family: 微软雅黑;color: rgb(171, 25, 66);box-sizing: border-box !important;word-wrap: break-word !important;"><span style="max-width: 100%;color: rgb(62, 62, 62);font-size: 15px;line-height: 24px;box-sizing: border-box !important;word-wrap: break-word !important;">超声一站式服务商</span></strong></span></strong></strong></strong></span></strong></p><p style="margin-bottom: 5px;max-width: 100%;min-height: 1em;letter-spacing: 0.544px;color: rgb(62, 62, 62);font-size: 16px;font-family: 微软雅黑;line-height: 2em;box-sizing: border-box !important;word-wrap: break-word !important;"><span style="max-width: 100%;font-size: 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0.544px;text-indent: 0em;color: rgb(62, 62, 62);font-size: 12px;font-family: Arial, Verdana, sans-serif;line-height: 2em;box-sizing: border-box !important;word-wrap: break-word !important;"><span style="max-width: 100%;line-height: 24.381px;box-sizing: border-box !important;word-wrap: break-word !important;">公司官网：http://www.parts-ultrasound.com/</span><span style="max-width: 100%;font-size: 14px;box-sizing: border-box !important;word-wrap: break-word !important;"></span></p><p style="margin-bottom: 5px;max-width: 100%;min-height: 1em;letter-spacing: 0.544px;color: rgb(62, 62, 62);font-size: 16px;font-family: 微软雅黑;line-height: 2em;box-sizing: border-box !important;word-wrap: break-word !important;"><span style="max-width: 100%;line-height: 1.75em;text-indent: 0em;font-size: 14px;font-family: Arial, Verdana, sans-serif;box-sizing: border-box !important;word-wrap: break-word !important;">微信公众帐号：</span></p><p style="max-width: 100%;min-height: 1em;letter-spacing: 0.544px;color: rgb(62, 62, 62);font-size: 16px;line-height: 25.6px;text-align: center;font-family: 微软雅黑;box-sizing: border-box !important;word-wrap: break-word !important;"><img class="" data-ratio="1" data-s="300,640" src="http://mmbiz.qpic.cn/mmbiz_jpg/dx3KibwtDhvfh2wVX4NftfnfjcZWIKK6EQDWtTTsYwjfQBnsqkThAZP5OlDmg5S3g22gSqMWhAxr2O4MydSJHnQ/640?wx_fmt=jpeg" data-type="jpeg" data-w="258" style="float: left;box-sizing: border-box !important;word-wrap: break-word !important;visibility: visible !important;width: auto !important;" width="auto"  /></p><p style="margin-bottom: 5px;max-width: 100%;min-height: 1em;letter-spacing: 0.544px;text-indent: 0em;color: rgb(62, 62, 62);font-size: 12px;font-family: Arial, Verdana, sans-serif;line-height: 2em;box-sizing: border-box !important;word-wrap: break-word !important;"><span style="max-width: 100%;font-size: 14px;box-sizing: border-box !important;word-wrap: break-word !important;">维修咨询：QQ: &nbsp;712638 404</span><br style="max-width: 100%;box-sizing: border-box 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break-word !important;"  /></p><p style="margin-bottom: 5px;max-width: 100%;min-height: 1em;letter-spacing: 0.544px;text-indent: 0em;color: rgb(62, 62, 62);font-size: 12px;font-family: Arial, Verdana, sans-serif;line-height: 2em;box-sizing: border-box !important;word-wrap: break-word !important;"><span style="max-width: 100%;font-size: 14px;box-sizing: border-box !important;word-wrap: break-word !important;">配件咨询：QQ: &nbsp; 712638 407</span></p><p style="margin-bottom: 5px;max-width: 100%;min-height: 1em;letter-spacing: 0.544px;text-indent: 0em;color: rgb(62, 62, 62);font-size: 12px;font-family: Arial, Verdana, sans-serif;line-height: 2em;box-sizing: border-box !important;word-wrap: break-word !important;"><span style="max-width: 100%;font-size: 14px;box-sizing: border-box !important;word-wrap: break-word !important;">交流Q群：1106 11074</span></p><p style="margin-bottom: 5px;max-width: 100%;min-height: 1em;letter-spacing: 0.544px;text-indent: 0em;color: rgb(62, 62, 62);font-size: 12px;font-family: Arial, Verdana, sans-serif;line-height: 2em;box-sizing: border-box !important;word-wrap: break-word !important;"><span style="max-width: 100%;font-size: 14px;box-sizing: border-box !important;word-wrap: break-word !important;"><span style="max-width: 100%;box-sizing: border-box !important;word-wrap: break-word !important;">阿里店铺网址：</span><span style="max-width: 100%;box-sizing: border-box !important;word-wrap: break-word !important;">https://renchengyiliao.1688.com</span></span></p><p style="margin-bottom: 5px;max-width: 100%;min-height: 1em;letter-spacing: 0.544px;text-indent: 0em;color: rgb(62, 62, 62);font-size: 12px;font-family: Arial, Verdana, sans-serif;line-height: 2em;box-sizing: border-box !important;word-wrap: break-word !important;"><span style="max-width: 100%;font-size: 14px;box-sizing: border-box !important;word-wrap: break-word !important;">电子邮箱：sales@parts-ultrasound.com</span></p>