本文来源:数码之家
老家哥们的逆变器,说是自己换完保险后火花四射。
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型号是:TaiJi TJ-2000F
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保修帖:11年7月吗?
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内部:怎么还背了一个包
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板子全貌
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板子背面:这保险换的真的有点水平
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背包里是一块 辅助电源
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辅助电源背面
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三块控制小板
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借图1:3块独立处理的微电脑模块
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小板1-SG3525小板
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小板2:单片机+324小板
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小板3:光偶+驱动放大小板
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DC-DC场管HY1906,一共4对8个
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H桥场管25N50四个
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DC-DC驱动放大用的8050和8550
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H桥电流检测0.1R2W两个并联
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两个220封装的TI41C和7805
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低压滤波电容1000u共4颗,而且明显比丝印小了一圈
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借图2:每两个优质电容配合一个变压器,什么鬼8个电容在哪,算上3个高压滤波电容 才7个
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高压滤波电容47u三个
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尖锋消除用的电阻和电容
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弯腰的CBB
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弯腰的CBB和电源输出插座位置有冲突,不得不弯腰
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已经烧断的两个35A保险,直接焊在PCB上的
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炸裂的1906
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变压器和E40磁芯相似,厚度略小,只有10mm
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查了一下功率单个200W左右,可以判定这个逆变器严重虚标,单从变压器来看4个变压器1000W的功率都不到,2000W应该标的是峰值功率
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24v正负短短路
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8个1906全部焊下击穿短路了4个,把好的两对管子临时试了下 ,看样子没什么别的问题
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换了8个非国产的1906
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改造1:固定辅助电源小板
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垫上了绝缘片
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和下面SG3525小板的距离
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和上盖板的距离
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改造2;为了避免焊保险的尴尬场面出现,决定用保险丝座
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板子上的四个保险丝的孔都用上了,装上了4个15A的保险
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这款逆变器的待机电流做的不错,才100mA
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用700W电吹风测试了一下,四个变压器及4对场管温升正常
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等元件的时候绘制了电路图,三块控制小板没焊下来没做分析
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关于辅助电源的疑问:既然没做成隔离电源,为什么没用一块7812
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和我以前的500W逆变器体积做了一下对比
作者:hui2868
本文来源:数码之家