Typical PFC Current Loop Bandwidth?

[Magnethicc]

What would be a typical cross-over frequency of the current loop of a 100KHz 230Vrms PFC?
I am asking because I saw a 2 designs with ~15kHz as the cross-over frequency and was wondering if it is just a coincidence or something about 15kHz is optimal?

 

[KlausST]

Hi,

and the mains frequency is????

I don´t think 15kHz makes sense. I´d rather expect 15Hz.
Did you read some PFC tutorials or design notes?

Klaus

 

[Magnethicc]

Hi,

and the mains frequency is????

I don´t think 15kHz makes sense. I´d rather expect 15Hz.
Did you read some PFC tutorials or design notes?

Klaus

Hi Klaus, I am talking about the current loop not the voltage loop.

I believe Mains frequency is irrelevant to the question but let's say 50Hz

 

[scopeprobe]

Rule of thumb is 1/5 to 1/10 of switching frequency so 15kHz is around 1/6

What would be a typical cross-over frequency of the current loop of a 100KHz 230Vrms PFC?
I am asking because I saw a 2 designs with ~15kHz as the cross-over frequency and was wondering if it is just a coincidence or something about 15kHz is optimal?

 

[24vtingle]

yes 15kHz is do-able, if not a bit on the high side........always make crossover f's as low as you can get away with.
And with av crrnt mode control PFC you can make the current loop much easier to stabilise by having more delta_i in the inductor current.
Remember to have your (small) input cap upstream of the sense resistor.

 

[Easy peasy]

6 - 15 Hz for the VOLTAGE loop, around 3-5kHz for the CURRENT loop ( ave current )