Re: IGBT switching speed / resonant switching...

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: Terrell Fritz <terrellfone@xxxxxxxxxxxxxxxxxxxxxxx>

Hi,

They switch "very fast" the frequency charts are based on "full time" 
operation and not "pulsed duty" like we use them...  The CW 
dissipation factors are far less at a "5% duty cycle"...

For short pulsed oscillation times like 5%...  Ignore the specs and 
the charts...  At high frequencies, the losses are high...  But at 5% 
duty cycle, divide the losses by 20 ;-))

Cheers,

        Terry

At 01:22 PM 3/4/2007, you wrote:
> Original poster: "Rajesh Seenivasan" <rajeshkvs@xxxxxxxxxxx>
>
> Dear forum members,
>
> Can anyone tell me how to calculate at the maximum switching speed 
> for IGBT modules? I understand that the turn on and turn off time 
> limits the switching speed. and the switching frequency will improve 
> a lot by utilizing resonant switching or zero current switching.
> Consider the following IGBT for example:
> BSM75GB120DN2 (or any 1200V, 100A IGBT bricks from Powerex or any 
> other manufacturer)
> Can they be used in a half bridge and switched at frequencies 75KHz 
> to 100KHz to generate square waves at 600V to 700V and current draw 
> between 30A to 50A (less than half of the continuous current 
> specification in datasheet) ?
>
> Thanks and regards,
> Raj.
>
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