May I recommend using a half bridge driver from IR: IR22141

https://ec.irf.com/v6/en/US/adirect/ir?cmd=catProductDetailFrame&productID=I
R22141SSPBF

This is actually a 1200V IC, so it might not be ok for you since your
MOSFETs are 1500V, but on the subject you said 1000V, so....

It has over current shutdown, under voltage protection and 2A source 3A sink
current capability.

Regards,
Mauricio Jancic



> -----Original Message-----
> From: piclist-bounces@MIT.EDU [mailto:piclist-bounces@MIT.EDU] On
> Behalf Of NOPE9
> Sent: Tuesday, September 08, 2009 15:18
> To: Microcontroller discussion list - Public.
> Subject: [EE]: designing a high side driver 1000V
> 
> I am designing a high side driver to go with a low side driver to form
> 1/2 of an H-bridge.
> I am using 1500V MOSFETs ( STW4N150 )
> http://www.st.com/stonline/products/literature/ds/11262/stp4n150.htm
> The spec says the turn on and turn off time for this MOSFET is about
> 50 nsecs.
> 
> I have considered using an opto-isolator part.  Are there any that
> have a speed around 50 nsec ?
> Or are there any other isolation techniques that would work ?
> 
> 
> I have included two schematics that show an approach I am considering.
> http://oh-god.com:5080/dir/1500V-driver/
> 
> the first schematic shows a totem pole consisting of two MOSFETS with
> drivers.
> HSD ==> High Side Driver
> LSD ==>  hallucinations , I mean Low Side Driver
> 
> 
> The second diagram is a High Side Driver.  Isolated 12V is supplied to
> drive the MOSFET.  R1 is 50K.
> Reflected through Q1 ( 2N3906 PNP )  ( I forgot the arrow on the R1
> side of Q1 )  , the base of Q1 will see
> 5M ohm.  R2 is 5M ohm.   The Q2 MOSFET is a 1500V device.  D2 would be
> a 1N4148 and D1 is a 15V zener.
> D1 is there to guarantee that none of the parts sees more than 15V.
> ( Other than Q2 or R1 and R2 )
> Power dissipation through R1 and R2 should be less than .25 watt.
> 
> Turning on Q2 should turn Q1 off.
> 
> A 2N3906 is rated at 100 MHz.   A 1N4148 is much faster than a zener
> diode ( I think ).
> 
> Will this circuit blow up and put out my eye ?
> 
> images are hand-drawn schematics captured by PhotoBooth running on a
> MacBook.
> 
> Gus
> 
> 
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