Guest liquibyte Posted November 11, 2014 Report Share Posted November 11, 2014 About a month ago I asked if anyone could explain why my 30V 5A (with 3 x TIP3055 output transistors) suddenly failed at 45V and no current. Both Audioguru and Redwire (I think) suggested a short in one of the 3055s. Finally I have isolated the fault to a 'popped' 3055.At the time that the PS failed, I was trying to charge a 'golf cart' battery which was nearly fully charged so no significant current. I set the volts on 14.1V and current limit at 1A. When touching the PS leads to the battery there were a few sparks (possibly back to front polarity), and maybe not, but PS popped the 3055.Has anyone had experience with the PS and 'active' loads like batteries, as opposed to passive loads like resistors?I've never tried anything like that but I'd think that this particular power supply wouldn't want to be used like that. If I were to try and charge a battery, I'd research a specific charging circuit or at least protection circuitry to add to the output of a power supply to allow this.On an unrelated note, I've been playing with the simulation and found that if I change the value of C6 in the sim schematic (C4 in the original schematic) to a larger value I can get the output to slowly ramp up. I tried introducing the spike like I had it in the mosfet circuit but it doesn't really affect the output so it's as if the circuit doesn't suffer from the problem. But, if we reduce the time the output can rise with a larger value here wouldn't the issue be solved for the most part? Quote Link to comment Share on other sites More sharing options...
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