求助：buck DC-DC的效率怎么计算啊？（PFM控制）

Amelia_Yao

希望哪位牛人帮忙解释一下，buck DC-DC 的效率怎么计算啊，paper里面一般都只画个效率曲线，没有具体的计算公式。
很迷惑啊

Chilton

The efficiency of a DC/DC converter usually has the following few items:

(1) Conduction loss: generated by the resistance of the siwtches.
(2) Switching loss: the overlapped of the current and voltage duing the switching operation
(3) Other losses: gate charge, inductor loss etc.

Now days integrated switches has optimized device/design to reduce the dominate loss mechanism therefore there is no easy way to estimate the total DC/DC converter loss.  Actually the easiest way is to publish a typical loss curve w.r.t. load and line operation so the user can lookup the expected loss by simply refer to his working condition in the curve.

Amelia_Yao

回复 2# Chilton


    那我在仿真的时候如何大概的计算效率？如何才能得到效率曲线呢

Chilton

It's difficult to get efficiency curve from simulation only. These types of curves are typically collected by bench tests.

You can estimate switching loss and conduction loss from simulation, which give you some idea about the approximate efficiency.

liuhe19821115

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Amelia_Yao

回复 4# Chilton


    got it, thanks

荣迅IC

同问

MarkDouglas

荣迅IC 发表于 2023-2-20 18:43
同问

同问，忘大佬不吝赐教。如果直接算输入输出功率的话，按照仿真结果calculator中是用RMS函数还是average(abs())呢？