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From: Chuck Simmons
Organization: You jest.
X-Mailer: Mozilla 4.61 [en] (X11; U; Linux 2.0.33 i586)
Subject: Re: series connection of switching power supplies
Date: Wed, 02 Oct 2002 01:17:38 GMT
NNTP-Posting-Date: Tue, 01 Oct 2002 18:17:38 PDT
Richard Everett wrote:
> I need a 56V (+/- 5V) power supply at about 20 to 30 amps. This is to drive
> the servo amps for 3 servo motors. I happen to have two 28V "SuperSwitcher"
> switching power supplies, each with a 40 amp output. Would it be crazy to
> try and use these hooked up in series? Would I need to have some sort of
> balancing resistor setup across the outputs for regulation?
In my dark and distant past, I used power supplies in the range of 75
volts and 1500 amps in series parallel. Parallel is tricky because of
current hogging. Series works fine but you should use a "free wheeling"
diode across the output of each supply. That is a rectifier diode
reverse biased by the power supply when it is operating normally. Some
switchers have a minimum load rating which may be as high as 10% of full
load. A power resistor of appropriate resistance will insure that such
supplies start normally.
... The times have been,
That, when the brains were out,
the man would die. ... Macbeth
Chuck Simmons firstname.lastname@example.org
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