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Registered Member #610
Joined: Wed Mar 28 2007, 09:44PM
Location: Middletown, RI
Posts: 110
To wet my whistle and begin experimenting with power switching, I decided to build a simple H-bridge test bench to run at low power. Key point: I have never designed a switching power circuit before. Hopefully this will provide me with more "working" knowledge of this stuff in addition to theoretical knowledge that I "think" I have. :) For now, the voltage seen by the load will be less then 100V.
What do you think?
---
As a tangental question to this post, I have noticed that many/most people here use GDT instead of chips. I am assuming that because tesla coils are a huge object of interest, the GDT provides the most isolation. I suppose they work fine and are robust for resonant circuits, but wouldn't one lose control over the waveform if they wanted to change the duty cycles and dead-time of the switching (as compared to a LO and HI side driver chip?)
Registered Member #89
Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
What do you think?
I think nothing because you provided almost no information about what are you trying to achieve. Full schematic would also be good.
GDT's have no problems with deadtime. All they want is constant volt-seconds over and under zero, and that is assured by your PWM controller and DC blocking capacitor.
Those IR chips look like a waste of money to me. They are useful but only in special occasions like low frequency or non-symmetric drive.
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
Well, if you want to play with other H-bridge applications like Class-D audio amplification or motor control, you're going to need that "low frequency and non-symmetric drive". I have a couple of boards with Toshiba TLP250 opto-isolated gate driver chips, that I would use for situations like that.
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