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Registered Member #1438
Joined: Sat Apr 12 2008, 12:57AM
Location: Canada
Posts: 218
I'm currently trying to build the pulsed flyback driver that jmartis2 (Dr.Dark Current) posted, and am having problems with planning and creating a suitable powersupply.
Currently, I have a heavy iron core power transformer that has a center tap for ground and two 28.7V not current limited. (Though checking the actual voltage on the power supply indicated that it was roughly 1.4V higher then the recorded without load in the following pictures below)
Would it be unsuitable to use multiple LM317 from a rectified and filtered for driving the driver due to the amount of power needed to be dissipated by LM317?
Or would there be a better solution to regulate the power for the driver using given transformer?
Registered Member #2901
Joined: Thu Jun 03 2010, 01:25PM
Location:
Posts: 837
I don't understand what you're getting at ... only the UC3844 needs a regulated supply, and it can take up to 30 volt so there doesn't need to be a large voltage drop across the regulator.
The supply going to the flyback primary doesn't need to be regulated at all, just needs a rectifier and a smoothing capacitor.
Registered Member #1438
Joined: Sat Apr 12 2008, 12:57AM
Location: Canada
Posts: 218
Pinky's Brain wrote ...
I don't understand what you're getting at ... only the UC3844 needs a regulated supply, and it can take up to 30 volt so there doesn't need to be a large voltage drop across the regulator.
The supply going to the flyback primary doesn't need to be regulated at all, just needs a rectifier and a smoothing capacitor.
If the supply to the flyback does not need to be regulated, would this schematic be suffice?
Registered Member #2901
Joined: Thu Jun 03 2010, 01:25PM
Location:
Posts: 837
Oops, I just realised ... the 220 uF capacitor is off by a factor of around a 100, it needs to be much larger for a reasonable ripple at 8 amps average current draw.
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Flyback driver powersupply question
