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From: "Richard Everett"
References: <2rrm9.25474$CN2.firstname.lastname@example.org> <3D9A4916.3291ABBF@webaccess.net>
Subject: Re: series connection of switching power supplies
X-Newsreader: Microsoft Outlook Express 6.00.2600.0000
Date: Thu, 03 Oct 2002 00:52:47 GMT
NNTP-Posting-Date: Wed, 02 Oct 2002 20:52:47 EDT
Thanks Chuck, it works fine. Good idea about the diodes.
"Chuck Simmons" wrote in message
> Richard Everett wrote:
> > I need a 56V (+/- 5V) power supply at about 20 to 30 amps. This is to
> > the servo amps for 3 servo motors. I happen to have two 28V
> > switching power supplies, each with a 40 amp output. Would it be crazy
> > try and use these hooked up in series? Would I need to have some sort
> > 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 email@example.com
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