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Suggestions on Electronic Load Design for my application

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Singapura

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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.
 

haymeron

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Re: Electronic Load Design

enclosed pdf files

regards - haymeron
 

E-design

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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
 

E-design

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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
 

Singapura

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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!
 

alphi

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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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