What is the best topology for a 1500W OFFLINE supply/charger?

[imran633@gmail.com]

i am in the process of desingning a 220Vac operated 1500W OFFLINE
charger/supply.
It should provide power factor correction, isolated o/p and I prefer
soft switching.
what then may be the best topology for this?
Any usefull links will be welcome!

Regards
Imran

 

[Rene Tschaggelar]

i am in the process of desingning a 220Vac operated 1500W OFFLINE
charger/supply.
It should provide power factor correction, isolated o/p and I prefer
soft switching.
what then may be the best topology for this?
Any usefull links will be welcome!

Push-pull with synchroneous rectification.
There are a number of application notes and a bunch
of datasheets at the linear technology and various
other manufacturers.
Have a look at the LT1922 for some intros.

Rene

 

[Ken Smith]

i am in the process of desingning a 220Vac operated 1500W OFFLINE
charger/supply.
It should provide power factor correction, isolated o/p and I prefer
soft switching.
what then may be the best topology for this?
Any usefull links will be welcome!

Are you allowed to let ripple appear at the batteries when they are being
charged? If so, the design can be a lot simpler. Normally you would have
to have quite a lot of capacitive storage.

PFC is usually done as a booster. The switching transistor requirements
in the PFC stage are easier to meet if the section is making just a little
more output voltage than the peak of the input.

A voltage fed push-pull forward converter is likely to be the best for the
isolated section. The current fed topology has no advantage when a single
output is being made. Flyback requires too much of an inductor at these
powers.

What is the output voltage? The type of rectifier you use will depend a
lot on that.

 

[Rich Grise]

i am in the process of desingning a 220Vac operated 1500W OFFLINE
charger/supply.
It should provide power factor correction, isolated o/p and I prefer
soft switching.
what then may be the best topology for this?
Any usefull links will be welcome!

Fifteen hundred watts, at 220 VAC line? That's less than ten
amps. If you're charging 24V batteries, that's still only 62.5
amps. For a battery charger jock, that's trivial. What's the
hangup?

I used to work for these guys, who make battery chargers and
aircraft power units:
http://www.bycan.com/
24 Volts at 100 amps is routine for these guys.

Good Luck!
Rich
(If you tell them "Rich sent me," please note that my surname
is pronounced, "Gryce" in English, or "Greiss", in German.
Thanks! )

 

[imran633@gmail.com]

Dear Mr. Rene and Ken
Thanks for your response, I would like to clarify the queries as
follows
The battery voltage is in the range of 48 to 72Vdc and I am allowing
the ripple to appear at batteries while charging. But I must be able to
reduce the current to twinkle (when batteries are charged).
As you have mentioned PFC is done as boost converter, but it does not
provide isolation. What I am trying to do is to use single stage that
would provide PFC ( > 0.9 would do) as well as isolation so that the
system would be simple.
In this power range IGBTs are more feasible, so I would like to use ZCS
(zero current switching) to be able to operate in 100KHz range. This
will also reduce noise and its related issues.
I have looked at LT9112. It does not has built-in driver and is
basically designed for low voltage output.
I am thinking more on the lines of parallel synchronous ZCS switcher on
full or half bridge topology using IGBTs
Regards
Imran