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jayswasthi
Joined: 05 Jun 2008
Posts: 3
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 05 Jun 2008 6:20 step up DC-DC converter Design |
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Hi,
Am a new user and just logged in.Could any one help me out with a dc -dc converter design. the specs are as follows.
Input Voltage 90-140V DC
Output Voltage : 400V DC slightly adjustable using MT pot.
Power: 3KW
Topology : Full Bridge input stage ,step up transformer, rectifier , output filter and PWM control
Isolation : HF Transformer isolation
Switching Frequency : 40Khz Or UPWARDS
Efficiency : minimum 90%
o/p regulation:1% from no load to full load
kind regards,
Jay
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darla1
Joined: 21 May 2008
Posts: 77
Helped: 4
Location: hyderabad
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| 05 Jun 2008 7:38 Re: step up DC-DC converter Design |
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you can use boost converter, why did you choose full brige it is costly with compared to boost.
and tell do you wnat to control with microcontroller or with any PWM IC
give reply i ll help you,
ramesh
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jayswasthi
Joined: 05 Jun 2008
Posts: 3
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| 06 Jun 2008 4:50 Re: step up DC-DC converter Design |
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Hi Ramesh,
If you are able to give me a boost converter design with isolation that would be great.
for the moment a PWM control will do.
thanks a lot
kind regards,
Jay
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blueroomelectronics
Joined: 17 Sep 2006
Posts: 1160
Helped: 58
Location: Toronto, Canada
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| 06 Jun 2008 5:21 step up DC-DC converter Design |
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| It's a very advanced project, why not just buy one? 3KW @ 400VDC will not be a cheap design. Why are you building it?
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jayswasthi
Joined: 05 Jun 2008
Posts: 3
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| 06 Jun 2008 9:11 Re: step up DC-DC converter Design |
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Hi ,
It would perhaps be prudent to buy it off the shelf. Could you give any price indications? for say 10 pcs. Do you manufacture them yourself?
kind regards,
Jay
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darla1
Joined: 21 May 2008
Posts: 77
Helped: 4
Location: hyderabad
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| 07 Jun 2008 7:31 Re: step up DC-DC converter Design |
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hi jayswasthi
boost will not provide isolation.....if you want without isolation i can give.
and if you want isolation use full bridge/half bridge
ramesh
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hsklkk
Joined: 29 Jun 2008
Posts: 10
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| 04 Jul 2008 15:32 step up DC-DC converter Design |
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| I also do similar thing for my final year project. What is the price of this product? What is the approximate budget (US$)for my project? Also, I would lik to ask ramesh, Why do you make it? We can share the experience later?
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TekUT
Joined: 17 Jun 2008
Posts: 203
Helped: 12
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| 04 Jul 2008 19:15 Re: step up DC-DC converter Design |
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Achieve this level of efficiency may be difficult with PWM hard-switched topology, I think you've to use soft switching techniques like ZVT (Zero Voltage Transition), take a look at the attached paper.
Bye
Powermos
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hsklkk
Joined: 29 Jun 2008
Posts: 10
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| 05 Jul 2008 5:28 step up DC-DC converter Design |
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thats mean It is difficult to get high efficiency for hard switching?
get >90%, soft switching must be need?
Added after 2 minutes:
what is MT pot????
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TekUT
Joined: 17 Jun 2008
Posts: 203
Helped: 12
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| 05 Jul 2008 18:10 Re: step up DC-DC converter Design |
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Humm if your work will be good enough may be an efficency value around 90% should be reachable. With ZVT tech circuit is a little bit more complicated but power switch and diode size can be keep smaller and more cool then more efficiency (less power loss) at the end.
Bye
Powermos
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