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Half bridge drivers, several questions

I

Ignoramus19740

Jan 1, 1970
0
Thanks to many suggestions received here, I am a little clearer on the
power side of the DC to AC inverting.

Now I am looking a little bit more on the driver side.

I am trying to figure out what is the best IC driver for my TIG
welding inverter. As I learned yesterday, there are many
choices. Ideally, I would like to find a chip that has a built in
timer and can change width of high vs. low side as percentage of the
oscillation period.

Less ideally, I could take a chip such as IR21094, and run it from a
separate timer or a signal generator.

So, my first question is whether there is any chip that's easiest to
use. I wonder why there are no chips (that I could find) that would
have a built in oscillator (like IR2153) and drive a full bridge
(like some other chips do) and have pulse width modulation also to set
pulse widths for positive and negative pulse duration.

My second question is whether these chips produce negative voltage or
zero voltage when they turn off a side of a bridge. The IGBT manual
that I read said that it is better to stop current by applying
negative voltage to the gate, rather than zero voltage. I could not
figure it out from reading the chips' datasheets.

thanks, and if my questions are wrong, do not hesitate to point this
out.

i
 
I

Ian Stirling

Jan 1, 1970
0
Ignoramus19740 said:
Thanks to many suggestions received here, I am a little clearer on the
power side of the DC to AC inverting.

Now I am looking a little bit more on the driver side.

I am trying to figure out what is the best IC driver for my TIG
welding inverter. As I learned yesterday, there are many
choices. Ideally, I would like to find a chip that has a built in
timer and can change width of high vs. low side as percentage of the
oscillation period.

I wonder if some of the 'Class D' audio amp chips from TI et al might suit?
 
I

Ignoramus19740

Jan 1, 1970
0
I wonder if some of the 'Class D' audio amp chips from TI et al might suit?

Ian, do you have any specific chip in mind?

Note that a chip that would drive these IGBTs, would have to switch
them quickly.

As of right now, I am looking at IR2109 chip, myself.

thanks

i
 
I

Ian Stirling

Jan 1, 1970
0
Ignoramus19740 said:
Ian, do you have any specific chip in mind?

Note that a chip that would drive these IGBTs, would have to switch
them quickly.

As of right now, I am looking at IR2109 chip, myself.

I was meaning to generate the PWM signal, from a 'audio' source (which in
this case would be a control voltage).
 
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