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From: John Popelish
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X-Mailer: Mozilla 4.7 [en] (Win98; U)
Subject: Re: Constant Current Sw Regulation?
Date: Tue, 19 Nov 2002 20:09:13 GMT
NNTP-Posting-Date: Tue, 19 Nov 2002 15:09:13 EST
Roger N wrote:
> 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!
This is a very functional way to accomplish current regulation, if the
exact frequency is not a concern.
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