For this four-tube synchronous boost topology, under what input voltage conditions is the input current the largest?

小太阳yy

For this four-tube synchronous boost topology, under what input voltage conditions is the input current the largest? [Copy link]

 

For this four-tube synchronous boost topology, under what input voltage conditions is the input current the largest? How should I consider selecting components? Can someone please give me some advice?

maychang

"Under what input voltage conditions is the input current the largest?"

If the output voltage and output current remain unchanged, it is obvious that the input current is the largest when the input voltage is the lowest.

小太阳yy

maychang posted on 2022-9-18 21:48 "Under what input voltage condition is the input current the largest? ?" If the output voltage and output current remain unchanged, it is obvious that the input current is the largest when the input voltage is the lowest...

Why, teacher? It can both step up and step down the voltage. When stepping down the voltage, shouldn't the current be the largest when the input voltage is the largest?

maychang

小太阳yy posted on 2022-9-18 22:20 Why is it, teacher? It can both boost and buck. When it bucks, shouldn’t the current be the largest when the input voltage is the largest?

"It can both step up and step down the voltage. When stepping down the voltage, shouldn't the current be the largest when the input voltage is the largest?"

Regardless of the type of switching power supply, the power transmission is approximate. Of course, there are losses in the circuit, but the design is to minimize the losses. When the loss is close to zero, the output power is equal to the input power (efficiency is close to 1), whether it is boost, buck, or buck-boost. Therefore, regardless of the type of switching power supply, the output power remains unchanged, and the input current is always the largest when the input voltage is the lowest.