Author Topic: Schema modification?  (Read 571 times)

Offline amdatlon

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Schema modification?
« on: February 09, 2018, 02:55:31 PM »
Hi,
Forgive my bad English.
I have this circuit for the welding machine, inverter.
with which transistor can I change FZT649 to work again in a circuit?
Can I replace it with 2T9139 = BD139?
The scheme works on Full Bridge, 30Khz.
This is not a resonance.

THANK YOU!



http://www.e-kak.info/forum/download/file.php?id=8670&mode=view
« Last Edit: February 09, 2018, 03:07:02 PM by amdatlon »

Offline Mads Barnkob

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Re: Модификация схемы?
« Reply #1 on: February 09, 2018, 02:59:45 PM »
Welcome to HVF :)

FZT649 has a much higher peak current capability than the much older BD139 transistor. So FZT649 is also better on almost any parameters like switching speed and saturation voltage.

It is properly not a big issue at 30 kHz, but you will have to check your gate drive waveforms to be sure that the replacement transistor can do it well enough.
« Last Edit: February 09, 2018, 08:09:28 PM by Mads Barnkob »
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Offline amdatlon

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Re: Schema modification?
« Reply #2 on: February 10, 2018, 08:26:26 PM »
Thanks for the reply :)
 But I find it difficult to find this transistor (.FZT649 )
Can you give him an analogue that is more accessible to find.


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Re: Schema modification?
« Reply #2 on: February 10, 2018, 08:26:26 PM »

 


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