Re: Transzorbs in IGBT circuits

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Steven Ward" <srward16-at-hotmail-dot-com> 

No need for bidirectional TVS when clamping across the C-E as there will 
only be voltage in one direction.  Right now im using 2 series 220V 1500W 
TVS.  From what ive seen, most all of them say <1nS response time.  Also, 
dont forget to put some clamping on the IGBT gates.  Im using back to back 
33V zeners, but a 30-33V TVS might work fine as well and if you get the 
bidirectional type, that saves some extra soldering ;).

Steve


>From: "Tesla list" <tesla-at-pupman-dot-com>
>To: tesla-at-pupman-dot-com
>Subject: Re: Transzorbs in IGBT circuits
>Date: Sun, 25 Apr 2004 12:39:27 -0600
>
>Original poster: Terry Fritz <teslalist-at-twfpowerelectronics-dot-com>
>
>Hi Greg,
>
>If I remember right, they only go to about 128 volts each in 
>bi-directional so you have to put a few in series.  I got the highest 
>voltage and highest power I could find which I think is 1500 watt.
>
>http://dkc3.digikey-dot-com/pdf/T041/0609-0613.pdf
>
>Cheers,
>
>         Terry
>
>At 08:26 AM 4/25/2004, you wrote:
>>Hello all,
>>
>>Currently constructing and collecting parts for a DRSSTC using "warp" 
>>speed 900v IGBTS, and will have ca. 600v input from rectified 415v two 
>>phase (240v per phase).
>>
>>Looking for some guidelines on what kind of transzorbs I should use. I 
>>assume I want the bidirectional devices right? And maybe about 750-800v 
>>rating? Do these things come in different speeds? What speed should I 
>>use? Any advice on wattage ratings would also be most useful.
>>
>>Cheers,
>>
>>Greg Peters
>>Department of Earth Sciences,
>>University of Queensland, Australia
>>Phone: 0402 841 677
>>http://www.geocities-dot-com/gregjpeters
>