design of activepower factorcorrection circuit

[subhaprakash010]

hi,

i want to design a active power factor correction circuit with the following spec

85 - 265 Vac input
400V dc output
2 kW


want to know it is buck or boost power factor circuit and how to identify that

 

[Mark R]

You need a boost circuit, as your Vo is greater than your peak input voltage.

 

[William Gaatjes]

A power factor corrector circuit has the special ability to draw current, phase corrected with the sinewave input voltage. That is, it behaves as if it was a pure resisitive load to your sinewave input voltage.

See picture :

For that you do not just need a boost circuit, but a boost circuit that draws more current when more input voltage is present and less current when less input voltage is present. This unlike capacitive loads or inductive loads.
A normal smps powersupply is a very dirty form of a capacitive and inductive load. Consuming a lot of current in spikes.
A power facto corrector circuit such as the MC33262 makes sure that your sinewave powersource does not see those current spikes but a resistive alike load.
But the tricky part will be to design the inductor. The inductor must designed or chosen properly be able to handle the amount of power you want to use.
You may want to have a look at Wurth Elektrik for a possible inductor.
For a smps power factor controller, the MC33262 from onsemi can be a good choice.



http://www.onsemi.com/PowerSolutions/product.do?id=MC33262