input:TRIZ axiomatic design 坏掉的台灯 电压表 充电宝 USB线
programing: use triz matrix find the contradiction and think the solution
use axiomatic design figure out customer needs,functional requirements，design parameters,process variables.
use the tools I can find to solve the problem.
{| class="wikitable" style="text-align: center; color: green;"
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|自带电源
|电压稳定
|可充放电
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|自带电源
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|移动电源
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|
|
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|电压稳定
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|可充放电
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|-
|}