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隔断式DCDC转换

Other Parts Discussed in Thread: TPS62120, BQ25504, BQ25570, BQ25505, LM25010

现有一个内阻是250欧姆,空载时测试输出类似正弦波,峰峰值是16V-20V的微型发电机,需要存储在一个超级电容内(内阻是80欧姆),电压为3.3V 一下,开始考虑用射极跟随器原理串通型直流电源,连接上超级电容后实际电压值减少,后来考虑使用DC/DC的方式输出电压,在输出置空的情况下OK,接上负载后输出减少?

求一个简易的方案达到以上的要求,谢谢!