AC-DC Full-bridge boost PFC 5kW
AC-DC Full-bridge boost PFC 5kW
(OP)
Hi,
I´m developing a AC[220Vrms,50Hz] - DC [400V] full-bridge boost PFC for 5kW output, but i can´t understand some things:
- first, how I can get a current with frequency of source AC and a constant output DC at the same time?
- In this moment, I control the four switches only by Vout, by: duty-cycle = 1-Vac/400, but I don´t have any results.
Can you help me?
Thanks!
I´m developing a AC[220Vrms,50Hz] - DC [400V] full-bridge boost PFC for 5kW output, but i can´t understand some things:
- first, how I can get a current with frequency of source AC and a constant output DC at the same time?
- In this moment, I control the four switches only by Vout, by: duty-cycle = 1-Vac/400, but I don´t have any results.
Can you help me?
Thanks!





RE: AC-DC Full-bridge boost PFC 5kW
The manufacturer's application notes are very detailed and you should not have a problem making it work - or understand how it works.
Gunnar Englund
www.gke.org
--------------------------------------
Half full - Half empty? I don't mind. It's what in it that counts.
RE: AC-DC Full-bridge boost PFC 5kW
I´m construct the PFC by zero. 4mosfets, a inductor, a capacitor and a load...
RE: AC-DC Full-bridge boost PFC 5kW
Gunnar Englund
www.gke.org
--------------------------------------
Half full - Half empty? I don't mind. It's what in it that counts.
RE: AC-DC Full-bridge boost PFC 5kW
Or not?
Thanks!
RE: AC-DC Full-bridge boost PFC 5kW
Gunnar Englund
www.gke.org
--------------------------------------
Half full - Half empty? I don't mind. It's what in it that counts.
RE: AC-DC Full-bridge boost PFC 5kW
RE: AC-DC Full-bridge boost PFC 5kW
Can you send a sketch of what your circuit looks like with the full bridge please? I have designed many PFC circuits using single-switch boost, transformer coupled, 2-switches and full bridge. I may be familiar with what you are trying to do. skogsgura's recommendation for app notes is very good. This one from TI is pretty good also. <http://www.ti.com/lit/an/slua144/slua144.pdf> google TI UC2854 and the website points to other good reading.
RE: AC-DC Full-bridge boost PFC 5kW
My circuit, is attached. In short, is 4mosfets, a source AC, a auxiliar inductance input and capacitor output; the resistor in load simulate the load for 5kW..
Can you send me some information about yours PFC circuits full-bridge, please?
Thank you!
RE: AC-DC Full-bridge boost PFC 5kW
What is your switching frequency ? What is your target for efficiency ?
RE: AC-DC Full-bridge boost PFC 5kW
Thank you for your opinion. In this momment, the goal is do convert works ;) after, I will study the methods (control and design) for improve the efficiency. But, in your opinion, you think that I have substitute the mosfets diode´s for diodes?
Thanks!
RE: AC-DC Full-bridge boost PFC 5kW
The circuit you showed is a typical "bridgeless PFC". If you changed the transistors to IGBT's with parallel ultrafast rectifiers you will solve you slow diode problem.