Paralleling Power Supply Units Made Easy ???
I am considering paralleling a couple of 20a variable adjustable psu's for 40a charging. According to what I have read on the world wide inter-web, it can be done quite easily, provided the following ...
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The 22 dollar units have feedback issues, as well as a most obvious lack of overcurrent and overtemperature protection devices. When I power up a pair of non isolated power supplies and hear a most definite oscillation I am not going to permit self destruction in the name of "I Told You So - I Win - Here Are The Images".
This is going to be on my part the end of the discussion about isolating the cheapowatts. The "fix" is so ridiculously simple it is not worthy of further discussion.
And after building 10,000+ alternators, I can state some voltage regulators are subject to paralleled feedback problems. Want numbers? The Delco 9000591, 592, and 593 darlington transistor powered regulators were infamous for this. Because the power transistor was rated for 22 amperes and field load was at most 5 amperes for the 12 volt model, Delco's initial upgrade prevented component failure but the oscillation persisted. It's pretty tough selling a job when an ammeter needles is vibrating so fast you cannot see it until it falls to the bottom the gauge case.
When I closed shop digital power supplies were an almost brand new topic. I do remember though, the Todd 75 switched power supply failing, if a generator went offline and spun down under load to less than 55 Hz. I've not the time nor do I wish to invest the time reinventing the wheel with switchmode power supplies. Every charger I have had to date has been a transformer type. If I had the money I would purchase 500 dollars worth of Mean Well power supplies to accomplish my task. I don't have the 500 dollars, nor 5,000 dollars to do the same thing with Lambda power supplies.
This is going to be on my part the end of the discussion about isolating the cheapowatts. The "fix" is so ridiculously simple it is not worthy of further discussion.
And after building 10,000+ alternators, I can state some voltage regulators are subject to paralleled feedback problems. Want numbers? The Delco 9000591, 592, and 593 darlington transistor powered regulators were infamous for this. Because the power transistor was rated for 22 amperes and field load was at most 5 amperes for the 12 volt model, Delco's initial upgrade prevented component failure but the oscillation persisted. It's pretty tough selling a job when an ammeter needles is vibrating so fast you cannot see it until it falls to the bottom the gauge case.
When I closed shop digital power supplies were an almost brand new topic. I do remember though, the Todd 75 switched power supply failing, if a generator went offline and spun down under load to less than 55 Hz. I've not the time nor do I wish to invest the time reinventing the wheel with switchmode power supplies. Every charger I have had to date has been a transformer type. If I had the money I would purchase 500 dollars worth of Mean Well power supplies to accomplish my task. I don't have the 500 dollars, nor 5,000 dollars to do the same thing with Lambda power supplies.
