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Registered Member #51
Joined: Thu Feb 09 2006, 04:17AM
Location:
Posts: 263
I wanted to create my own DRSSTC /universal driver. I have always had problems getting the Steve Ward style drivers to start. In this design, I used a comparator for hopefully a very sensitive low level response. I have also included a startup oscillator to get things going, and so that the flipflop will have a clock so that it can enable the drivers when then coil is not running.
I included both pulse and average OC protection in my design so that I can get the coil to shut off if it draws more than 15A average over 1 second for example.
Perhaps someone will look over my design and comment on if it looks workable? Am I likely to get a large time delay between input and output phase? I suspect it will be minimal as long as i use fast logic and comparators.
Registered Member #51
Joined: Thu Feb 09 2006, 04:17AM
Location:
Posts: 263
"ic3 could be a D-type flipflop, why do you need average OC?, does ic1a detect zero cross?"
Yes, It could be, I decided to use a JK because I have them on hand already, and I figured they might be useful for other projects as well. Is there a D type in the 74 logic family?
I suppose I don't need average current limiting, but if I wanted to modulate my bus voltage to some low level, for audio modulation for example, I would want average current limiting so I am less likely to overheat my IGBT's
Registered Member #51
Joined: Thu Feb 09 2006, 04:17AM
Location:
Posts: 263
And here is my board design.
I was a little worried about the need for an under voltage lockout so that the transistors would never be asked to switch with a low gate drive voltage that could potentially cause them to be put in a linear mode.
To protect against this, I stuck a 15v zener diode in front of the 5v regulator with the hope that as the gate drive rail voltage dips, the 5v regulator will drop out when there is still at least 20v left in the gate drive power supply. My intent is to get the logic circuitry to shut down before the gate drive stuff does.
EDIT: i've decided to pull the enable line low with a TC54 voltage detector when the gate drive voltage falls below about 20v or so.
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Rate my DRSSTC driver
