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精通开关电源设计笔记


三种基础拓扑(buck boost buck-boost)的电路基础: 

1, 电感的电压公式 dt dI V = L = T I L Δ Δ ,推出ΔI=V×ΔT/L

2, sw 闭合时,电感通电电压 VON,闭合时间 tON sw 关断时,电感电压 VOFF,关断时间 tOFF

3, 功率变换器稳定工作的条件:ΔION=ΔIOFF即,电感在导通和关断时,其电流变化相等。 那么由 1,2 的公式可知,VON =L×ΔION/ΔtON ,VOFF =L×ΔIOFF/ΔtOFF ,则稳定 条件为伏秒定律:VON×tON=VOFF×tOFF

4, 周期 T,频率 f,T=1/f,占空比 D=tON/T=tON/(tON+tOFF)→tON=D/f =TD →tOFF=(1-D)/f ......


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