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boost电路的基本参数计算



你好!我在看贵公司Basic Calculation of a Boost Converter's Power Stage这篇文档时有几点不明白:

1.为什么计算占空比是:D=1-Vin*η/Vout,按照常规的计算,如果根据伏秒平衡来算应该是:D=1-Vin/Vout(忽略二极管压降)

2.在估算电感纹波电流时,不是说取输出最大电流的20%~40%吗,  dI=(0.2 to 0.4)* Iout *Vout/Vin

怎么多了一项Vout/Vin在里面啊

希望专家能帮我看看,我是哪里没有理解正确吗?非常感谢!