Re: [TCML] IGBT H Bridge Driving info needed

[Michael Twieg <mdt24@xxxxxxxx>]

The most common way for driving high voltage half and H bridges are to use
components called bootstrapping high side drivers.  There are many types,
most well known are the devices made by international rectifier (for
example the IR2113 is very common).  But for driving SSTC and DRSSTC
bridges (where you only need to drive with a 50% duty cycle), using a gate
drive transformer is generally a more robust and simpler option.  See steve
ward's website for more explanation of how GDTs work for tesla coils.

-Mike

On Thu, Dec 27, 2012 at 6:04 PM, mr. scot dingman
<1stbunnykiller@xxxxxxxxx>wrote:

> Hey All...
>
> Been "trying" to understand IGBT driving electronics, but I seem to be
> finding very little in detailed schematics AND tutorial style information
> regarding the hi side drivers. I have been able to get the low side of the
> H bridge to operate but the hi side doesnt want to behave properly. I came
> across some info that stated that the hi side driver needs to be an
> additional Vg+ more than the input to the C1 of the H bridge. Ummm... how
> do I do that?? One thought was to place several Diodes in series to C1 to
> give me a voltage differential to create the required difference for the
> gate. Example: supply is 90 VDC with ehhh 10 diodes in series for a 15 volt
> drop ( 15V being a decient voltage to run the gate) and have 75 VDC at C1
> to run the H bridge. BTW, this is for a motor controller to turn the variac
> up and down...  e.g. speed controlled and direction controlled. As far as
> speed control, I can pulse the low side and drive the high side in steady
> state or the other way around, OR I can drive the complete H bridge in
> steady state and pulse a 5th IGBT feeding E2's of the bridge...    too many
> options, not enuf knowledge...
>
>
> Scot D
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