Author Topic: Very high current >50-100 Amps 3-5 VDC Solid state relay form "C" MBB  (Read 634 times)

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Offline HCT203

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Seeking help in finding a source or maybe designing a  high current solid state relay   SPDT  > 50-100 ADC  form  " D"  it is essentially a  form "C" EXCEPT  MBB ( make before break ) working voltage 3-5 V
switching speed < 10 msec  rep rate less than 5/minutes or  every 12 second . seeking very low ON impedance  ( Less than  2 milliohms )
Willing and able to compensate anyone helping  me in solving successfully this requirement .
Please do not underestimate this project will require serious  solid state relay experience as well very strong FET Gate driving design skill,
Been looking to use HT0440 by Microchip , as well as sub-milliohm Power MosFET such as IRF1324S-7PPbF  or IPT004N03L .  

Offline Ice-Tea

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Re: Very high current >50-100 Amps 3-5 VDC Solid state relay form "C" MBB
« Reply #1 on: October 16, 2017, 06:35:20 PM »
The problem with devices such as that Microchip is that they are slow. Which means slow switching and spending a looooong time in the Ohmic region of those fets. I made a 80V/30A(+) SSR some time ago that worked fine (albeit not in SPDT form). Should probably work, but depending on your price target it may not be suitable.
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Online nctnico

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Re: Very high current >50-100 Amps 3-5 VDC Solid state relay form "C" MBB
« Reply #3 on: October 17, 2017, 04:59:28 AM »
This shouldn't be too hard to design unless there are complicating requirements which make the design difficult (cost, form-factor, rush-in current, etc). However my first thought would be to use a regular relay and be done with it. At 100A a 2 milli-Ohm resistance will dissipate 20W.
There are small lies, big lies and then there is what is on the screen of your oscilloscope.

Offline PeterN

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Re: Very high current >50-100 Amps 3-5 VDC Solid state relay form "C" MBB
« Reply #4 on: December 26, 2017, 12:05:46 PM »
Hi HCT203,
Did you solve your problem? Mind sharing how and what the application was?
If not I could point out a few components that we found useful for designing this type of high current switch.

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