Highpower H-Bridge

[Holzwurm56]

Hello,
has someone a schematic for a highpower and highvoltage h-bridge , 150 V / 15 A . I want to control the h-bridge with the pwm-signal from the elmservo .
Many thanks for every answer
Hans

[lzgjxh]

thanks ,i'm go to here first.

[emilcnc]

http://cnczone.com/forums/showthread...=17726&page=23

Check out here ..

Emil

[NASR1]

Hello
Check out here .
http://www.modularcircuits.com/h-bridge.htm
http://cnczone.com/forums/showthread...568#post341568

[hesham morsy]

Open Source Motor Control
http://www.robotpower.com/products/osmc_info.html

[baggs]

Holzwurm56,
I just posted a design I did for myself that works to 150VDC though the semiconductors are rated to 200V. The fets have a 28A rating but to be honest you might want to parallel all of the N-Channel FETS with one more of the same kind. The driver can handle it, the heatsink would also have to be made larger PLUS you would need AIR FLOW.
As I only needed 110VDC for a NEMA 32 motor that had 3A windings the 8 Amp rating was just to show it would handle the 2 3A windings but remember that I Squared R meaning that at 10A's the .081 ohm RDSon resistance will generate just by itself just over 8Watts. Now if you were to parallel the FET then you would have 4W or if you found another N-Channel that had half of the RDSon of the FET's I used. I.R. would be the BEST place to go but please do consider the Gate capacitance when picking your FET. The driver has what it takes to slam it on & slam it off but with too much capacitance your going to slow things down a wee bit.
The trouble with High Voltage H-Bridges is the driver circuit, it must be at a higher voltage then what is on the drain hence they use a trick with a cap that raises the gate voltage about 12-15V above the drain voltage BUT the way around this by the use of a P-Channel Fet for the High Side FET. This allows for higher voltages to be switched w/o needing a greater voltage on the gate BUT here is the MAIN PROBLEM, P-Channel FET'S have higher RDSon resistance then thier N-channel counterparts. And with that you GET HEAT & LOTS OF IT PLUS A VOLTAGE DROP but it is the HEAT that really puts the use of P-Channels to rest.
If you do not like my post in this same section at least take a moment to go to Fairchild Semi's website as they have a nice line of high side driver IC's that work to 600VDC. Also there are some write ups about using the Intersil 80V H-Bridge I.C. with external P-Channel FET's to increase the voltage on a H-Bridge but again the N-Channel is turning on the P-Channel & this takes a lot of drive & time so be using a P-Channel on the output does work but at what loss... Speed...
So until someone designs a High Voltage >80VDC with > 8A current the only way to get what you want is by building it up yourself. Heck I designed my circuit, got free sample from FSC to build it up & before too much time had passed had received 10 offers to purchase & build the design, why? My guess is that there is a REAL NEED for just that a high voltage high current H-Bridge for these larger more powerfull motors.
As a not do not use a Buck regulator powered from the AC line thru a bridge rectifier to furnish your 150VDC UNLESS you use a good high power AC Isolation Transformer in front of the bridge. Then your rectified voltage will be isolated from the wall circuit.
BAGGS