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Texas Instruments
2 天
UCC28180: 网侧输入低穿偶发PFC MOS过流烧毁
PFC工作环境:网侧220V市电输入,380V输出,设备为无线充电设备发射端,UCC28180用作boost pfc供电,设备满载功率为800W,电路可参考下图 问题现象:在设备满功率运行时网侧出现短时低穿,将PFC MOS击穿,经过后续复现,捕捉到PFC电感的电流波形ch4以及PFC输出电压 ...
来自MSN
11 天
腾冲火山竟然长得像云南的“菌子”?而且还成群结对!
我国的云南省腾冲市,在西汉时称为“滇越”,1913年(民国二年)改称为腾冲县,现为云南省辖县级市。腾冲市境内新生代以来形成的火山群(腾冲火山群)是我国最大的活火山群之一,约包含97座火山,火山喷发活动始于中新世,延续至全新世。
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