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All N-MOSFET H-BRIDGE FOR 150Amps

All N-MOSFET H-BRIDGE FOR 150Amps

All N-MOSFET H-BRIDGE FOR 150Amps

(OP)
Hi all,

Currently using DPDT relays to reverse polarity on electrochemical cells. We are wanting to FET the power to them to be able to PWM the power and periodically reverse polarity. I found some circuits where all N-MOSFETS were used by driving the ones on the high side with a larger gate voltage. Only real questions here are...

*Has anyone built a MOSFET H-Bridge in this capacity range?

*Anything to look out for in paralleling this many MOSFETS?

*Recommendations on putting all of the D and S of the MOSFETS on common rails or busses?

Check out the basic schem but know that the parallel arrays are represented by only single MOSFETs
 

RE: All N-MOSFET H-BRIDGE FOR 150Amps

Not hard paralleling one FET.

Go to IXYS and look around.

Keith Cress
kcress - http://www.flaminsystems.com

RE: All N-MOSFET H-BRIDGE FOR 150Amps

If this is a high voltage design then IGBTs are likely to be a better solution. If it's low voltage then MOSFETs are likely to be better. Check out the packaged modules from Semikron and I-R in addition to those from IXYS suggested by Keith. 150A rating isn't that high - I-R's range goes above 400A.
  

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If we learn from our mistakes I'm getting a great education!
 

RE: All N-MOSFET H-BRIDGE FOR 150Amps

(OP)
Low voltage ~10-15V
Forgot to mention that

RE: All N-MOSFET H-BRIDGE FOR 150Amps

I've seen DC motor controllers (forklift or golf cart type of thing) with many parallel TO-220 package mosfets in them.

But, as already posted, there are some high power devices out there. IGBT's in VFD's are typically in a 3-phase or 3-H bridge package. When higher power is required 3 packages are used with the devices paralleled.

So, should not be a problem, but still, if you do parallel devices you have to be very careful of the resistance and inductance of your busswork to make them share.
 

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