Igbt driver for 3.5kw

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justinjohney

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a battery charger of around 3.5kw 24V,130A using fully controlled IGBT topology.
is there any IGBT driver/IGBT driver module available in india?
can i use igbt as rectifier ,without seperate bridge?
3phase ac-> igbt->low voltage dc ->filter ckt->24VDC(+/-1% Ripple)
 

Do you intend to convert 400 VAC to 24 VDC directly without a transformer? That's a bad idea in terms of efficiency.
 

justinjohney said:
can i use igbt as rectifier ,without seperate bridge?
3phase ac-> igbt->low voltage dc ->filter ckt->24VDC(+/-1% Ripple)
Click to expand...

If you want to use your semiconductor element as both a power controller and integrated bridge, it would be FAR easier to use SCRs.

However, as the previous poster has mentioned, going from 400v to 24v without a transformer is not a good idea. Not only the efficiency will be poor, but the powerline harmonics will be horrendous, and the output voltage will have a large potential to ground, which can be an electrocution hazard.
 

no using a transformer
Click to expand...
Did you review the circuit at all? The schematic shows a 3 phase transformer with bridge rectifier. It's also dedicated for high voltage (90 to 210 V) batteries. A 24 V charger would hardly use IGBT as secondary switch.

Curiously, the IGBT switch is placed between output capacitor and battery. It's not connected as a buck converter and can't perform current or voltage regulation. I don't see how the design could be reused for a 24V charger.
 

sorry actually using trf
i,m trying to replay a querry
"no,using a trf"

A simple comma (,) have more sense than me
:sad:
 

Thanks for the clarification.

You can either use a SCR based controlled rectifier with passive filter, or an uncontrolled bridge with a buck converter. A MOSFET of respective current rating would achieve best efficiency. Ultimately the charger would use a PFC input stage, but that involves considerably higher effort.

I don't really understand the voltage ripple specification. It's the current ripple that matters for a battery charger.
 

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