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From: "Roger N"
Subject: Constant Current Sw Regulation?
X-Newsreader: Microsoft Outlook Express 6.00.2800.1106
Date: Tue, 19 Nov 2002 18:05:35 GMT
NNTP-Posting-Date: Tue, 19 Nov 2002 10:05:35 PST
Organization: EarthLink Inc. -- http://www.EarthLink.net
On the battery charger I'm working on, it needs to be able to charge from
1.2V to ~20V. I prefer to use a switching regulator for efficiency. A
description I read for a chopper stepper motor drive explained that they
turn the switch on when the current is lower then the desired current and
turn the switch off when it is above the desired current. Would it work to
use an op-amp circuit with hysteresis and a current sensing resistor to
switch the transistor of a basic buck converter? For example, for 1A
regulation, switch on at 0.95A and back off at 1.05A.
This sounds simple enough and the switching frequency could vary depending
on the inductor and load. Just wondering if there was any reason not to do
it this way? Thanks!
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