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PWM Switch # 3 | 9 comments (9 topical, editorial)
Re: PWM Switch # 3 (3.00 / 0) (#6)
by mtbandy on Tue Feb 26th, 2008 at 11:24:46 AM MST
(User Info)

The usual way to measure current like this is to convert the small voltage across a known shunt resistance into a fixed frequency / variable duty ratio signal (so duty ratio becomes proportional to current) and pass this through an opto to the logic side of the circuit, so it swings from 0v to your ADC reference voltage (usually 5v). A simple low-pass filter on this signal results once again in an analogue level that you feed into your ADC. Have a look at the IR2175, it's a very nice current sense IC that does just this.


PWM Switch # 3 | 9 comments (9 topical, 0 editorial)

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