| | | | | 今天申请了 IPD80R280P7 的COOLMOS,先设计板子先 |
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| | | | | | | | | | | | | | | | | | | | | | | 第一贴就写到这里,电源的理论计算和器件选择以及调试过程会在下面楼层一一跟进,后续有资料会上传到此来。 |
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| | | | | | | | | | | | | | | | | | | | | | | | | LD7830最复杂的部分不是设计变压器而是计算OVP和OCP的电阻值 |
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| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 通过IZD计算就是输出电流的最大OCP电流计算上拉电阻的值=知道输入的IPK值,这里不知道需要求解,NP变压器的初级圈数31T NVCC取16V RZ1是我们要求的值,这个值相当的关键,否则会影响PF值等一系列的问题 |
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| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | IZ1MAX 计算 1920/{(31/10)/RZ1}的值小于2,实际计算RZ1约大于310K实际R9的取值在270-310K之间,这里我取值270K.这里是过流OCP的保护计算公式。 |
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| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 首先知道RZ1 通过表格我选择了RZ2=21K 而21K 这个对应了TON=9.1US,然后重新带入值计算符不符合上面公式 |
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| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 下面R21=RZ2的值必须在TON的范围内,否则开关频率会变到很大或很小都超过IC的范围 了。 |
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| | | | | | | | | | | | | | | 现在来用现有的骨架和磁芯来绕制变压器,骨架PQ2620,磁芯用PQ2720 PC40的材质 |
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| | | | | | | | | | | | | | | | | | | | | | | 采用三明治的绕法第一层单股0.5的QA线 绕制初级线圈的16T |
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| | | | | | | | | | | | | | | | | | | | | | | | | | | | | 测试好电感量 ,磨好磁芯,磁芯外面包上2层胶带后用铜带包上一层,铜箔的连接丝连接6脚,之后再包两层胶带,骨架和磁芯包2层胶带 |
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| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 然后去含浸,当然可以等通电测试之后调整一些参数先不用含浸。 |
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| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 贴片的元件焊好了就差英飞凌的MOS了,接下来先焊插件的。 |
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| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 计算跟实际取值差得也太远了吧,你计算变压器的其他参数要不要变呢 |
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| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 输出整流管的峰值及波形,管子用的200V的耐压,以后改成250-300V耐压的管子。 |
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| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 传导N,余量不是太大,先整改下。改下磁环滤波器,传导还可以,辐射,暂时没有设备测试 |
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| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 温度测试下还是很好的,结论是英飞凌的MOS确实效果好好的。 |
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| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 启动时间小于1秒,OCP在3.1A进入保护模式,满足了输出电流120%-130%(3-3.25A)的要求,准备把板子寄给英飞凌的专家们测试下。 |
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| | | | | 里面的内容非常详细 包括开始 设计 结束 全全面面 |
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| | | | | | | | | | | | | CS电阻太小了,2.8A怎么会做到13A了,电感量和这个电阻调整下,另外你的频率是多少呢? |
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| | | | | | | | | | | | | | | 实际的电感量比计算的变化了,匝比不变,初级的线圈,根据CS电阻的电流来改变,不要饱和,这个芯片的工作频率是由IC来控制的。请阅读下规格书。 |
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| | | | | | | | | | | | | | | | | | | 这个IC最难的就是PF值下降的问题,注意调节光耦初级的电阻和并联1.2脚的电阻,否则老化后出现pf值下降的问题。 |
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| | | | | | | | | | | | | | | | | | | | | 这里说下7830pf调试中不高问题,掌握光耦的补偿,CBB大小,CS电阻的大小,需要仔细的调整,才能达到理想的PF值要求。 |
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| | | | | | | | | | | | | | | | | | | | | | | 还有RZD的上下拉电阻我也是调了好久最终确认了这个阻值,阻值关系到IC的频率甚至不能带载或者要重新确认CS电阻大小的问题,过流点的问题,这一系列息息相关,调这个需要耐心。 |
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| | | | | | | | | | | | | | | | | | | | | | | | | 这款IC调好了还是很稳定的,调试需要根据规格书来,细调,希望对想用此款IC的朋友有帮助,同时我们大家一起学习,把你遇到的问题提出来一起分析解决。 |
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| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 后面用3个VF较低的管子,效率达到了87.8,没有加同步的。 |
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| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 100瓦整流桥用的GBU608,同时也需要调整7830的功能保护脚的电阻 |
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| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 100瓦做的是12伏8A,OCP放到10A,mos用英飞凌的 |
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| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | COOLMOS过辐射的方法,管子的栅极过小会造成辐射不好过,适当的调大,具体以栅极的波形为主,波形不能有推动不足的情况出现。 |
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| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 加磁珠,一般加在漏极,也有加在栅极和源极的,有时候加了反而传导不好过,请酌情考虑。 |
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| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 还有一个就是前面的小共模和后面的共模也要加上起到很好的作用,磁环的电感量不是越大越好,材质也必须要好,有可能热机出现超的情况,所以最好在热机半个小时后测试。 |
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| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 这是本人在实践中得出来的一些经验,当然欢迎对此问题感兴趣的的朋友,提下意见。 |
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| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 变压器加屏蔽以后漏感大了,这么大的电流做反激式,尖峰也比较高700伏左右,用800伏的管子够了,这管子也够用,必须得在底部加散热片,同时为了减少峰值,得减小匝比,把次级加多了一圈,峰值才低了。 |
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| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | CS电阻调到了0.075欧,保证了OCP达到10A满足了8A的1.2倍,实际96瓦 |
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| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 输出整流管用了3个30100,低VF的管子,效率达到了87 |
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| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 测试100瓦变压器频率在40多K,于是把电感量减少到180UH |
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| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 启动问题和异响问题,由于变压器频率低,变压器同时产生了20KHZ 以内的人耳所听到的声音,改善后开关频率提高了,解决了这两个问题。 |
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| | | | | 相对于双级无频闪方案来说成本有绝对的优势,适合欧洲客户。 |
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| | | | | | | 正在做一款TO-252封装的电源以后可以用这款MOS了 |
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| | | | | | | | | 正在做一款TO-252封装的电源以后可以用这款MOS了 |
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| | | | | | | | | | | 这样既不担心耐压不够,加屏蔽也不会出现耐压超的问题800V的管子不错了。 |
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| | | | | | | | | | | | | | | 多谢张工的支持 一直都有在更新自己的帖子 期待你在大赛中取得好成绩 |
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