[经验]

这条赛道是诡计还是善待？

2018-11-1 08:56:46

1588 安森美转换器二极管

当我们准备在本周末庆祝万圣节时 - 我们的一些工程师将电路图放在一起，如果要设计的话可能会或可能不会导致工程师惊吓。在一周的过程中我们会发布
这些电路让我们知道您在评论中的想法！
我们会在一天结束时发布每个答案。
首先，这款2开关反激式转换器设计用于从100 V输入提供12 V电压。
大胆的设计师Horatius相信它会起作用。
你同意吗？
答：转换器是电声的，这意味着施加电源不会导致灾难性的故障。
然而，输出电压将被钳制到10 V，而不是12 V，正如Horatius所预期的那样。
原因在于变压器匝数比为10.当两个开关同时打开时，输出电压通过变压器反射到初级侧。
但是，反射电压不能超过输入电压和两个钳位二极管所施加的电平。
由于输入源为100 V，反射电压偏移将被阻挡至大约100 V（忽略二极管正向压降），在匝数比为10后，意味着输出电压为10 V.

以上来自于谷歌翻译

以下为原文

As we get ready to celebrate Halloween at the end of the week - a few of our engineers put together circuit diagrams that may or may not cause a fellow engineer fright if it were to be designed in. Over the course of the week we'll post these circuits and let us know what you think in the comments! We'll post each answer at the end of the day.
First up, this 2-switch flyback converter is designed to deliver 12 V from a 100-V input. Horatius, the bold designer, believes it will work. Do you agree?

Answer: The converter is electrically sound, meaning that applying the power won’t lead to a catastrophic failure. However, the output voltage will be clamped to 10 V, not 12 V as Horatius presumptuously expected. The reason lies in the transformer turns ratio of 10. When the two switches simultaneously open, the output voltage is reflected to the primary side via the transformer. However, the reflected voltage cannot exceed a level imposed by the input voltage and the two clamping diodes. As the input source is 100 V, the reflected voltage excursion will be blocked to roughly 100 V (neglecting the diodes forward drops) which, after a turns ratio of 10, implies an output voltage of 10 V.