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Electronic Load Design
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Singapura



Joined: 04 Oct 2001
Posts: 40
Post13 Jan 2004 4:19   

Electronic Load Design
I am building an active load for a high-current (125A) low voltage (5Vdc) power supply.

My intention is to use the GP500LSS06S for my application and attached is a simple block diagram on the design. Would appreciate any advice or suggestions. Thank you.

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haymeron



Joined: 01 Jan 1970
Posts: 128
Helped: 11
Post14 Jan 2004 14:07   

Re: Electronic Load Design
enclosed pdf files

regards - haymeron
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Post14 Jan 2004 14:07   

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E-design



Joined: 01 Jun 2002
Posts: 947
Helped: 68
Post14 Jan 2004 17:01   

Re: Electronic Load Design
To use a PWM signal to drive the MOSFETS is one way in using them as an active load. The problem comes when you do some serious testing and eval of PSU's you will have a problem measuring the noise on the output of the PSU under test as you will have the effects of the PWM on there. PWM will be good for transient response test but for noise you need a linear drive.

I made a 50v/50A unit with some 25 X IRF1010 in // on a massive forced cooled heatsink operating in a linear mode.

E
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E-design



Joined: 01 Jun 2002
Posts: 947
Helped: 68
Post14 Jan 2004 17:02   

Re: Electronic Load Design
To use a PWM signal to drive the MOSFETS is one way in using them as an active load. The problem comes when you do some serious testing and eval of PSU's you will have a problem measuring the noise on the output of the PSU under test as you will have the effects of the PWM on there. PWM will be good for transient response test but for noise you need a linear drive.

I made a 50v/50A unit with some 25 X IRF1010 in // on a massive forced cooled heatsink operating in a linear mode.

E
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Singapura



Joined: 04 Oct 2001
Posts: 40
Post15 Jan 2004 0:55   

Re: Electronic Load Design
Thanks to haymeron for the design tip, though, that's the first time I see a PWM used for PSU load testing.

E-design has a good point regarding the intended purpose and possible noise issues for such an approach. In the past, I did design an active linear load to test a 2kV PSU at 1.6A. This time round, however, it is the high current (125A) that really concerns me.

Thanks for the advices!
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alphi



Joined: 23 Dec 2001
Posts: 440
Helped: 1
Post18 Jan 2004 1:34   

Re: Electronic Load Design
I am building a 50V/10A active load, but now want a di/dt controlling function,anyone can suggest how to design it?
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pico



Joined: 30 Sep 2001
Posts: 285
Helped: 6
Post19 Jan 2004 7:51   
Try this link.
http://www.webx.dk/oz2cpu/radios/dc-load.htm
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