Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!uunet!motcid!reichert
From: reichert@motcid.UUCP (Charles H. Reichert)
Newsgroups: sci.electronics
Subject: Re: How to make 600VDC from 800VDC
Message-ID: <4439@cocoa46.UUCP>
Date: 18 Oct 90 17:10:54 GMT
References: <92@decabo.enet.dec.com>
Organization: Motorola Inc., Cellular Infrastructure Div., Arlington Heights, IL
Lines: 23

In sci.electronics you write:


>       I have a need to obtain 600VDC at about 150-200mA from an
>       800VDC supply. It need not be exceptionally well regulated
>       voltage-wise, but does anyone have a simple solution?
>       (not as simple as a resistive voltage divider however!)

        Try using a 28VAC 2A Transformer in a "Bucking" mode on the
        Power Supply Input Transformer.  This will drop the voltage
        to the range you need.  Of course anything else hooked up
        will likewise be lowered so bypass these inputs unless they're
        off the same transformer, in which case you're stuck using
        this method.

        Another approach is to use some hefty Zeners... a string of 4
        51V 400mA (or higher) Zeners in series from the DC output will
        drop the voltage.

        Chuck Reichert  KD9JQ

        708-358-3827 Home after 8PM CST
        708-632-6669 Work