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
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
Go to IXYS and look around.
Keith Cress
kcress - http://www.flaminsystems.com
RE: All N-MOSFET H-BRIDGE FOR 150Amps
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If we learn from our mistakes I'm getting a great education!
RE: All N-MOSFET H-BRIDGE FOR 150Amps
Forgot to mention that
RE: All N-MOSFET H-BRIDGE FOR 150Amps
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.
RE: All N-MOSFET H-BRIDGE FOR 150Amps
Check this thread: thread238-243033: Load Bank Transistors Blowing out.
Keith Cress
kcress - http://www.flaminsystems.com