Sample and hold method and apparatus for sensing inductive load

Details Sample and hold method and apparatus for sensing inductive load Sample and hold method and apparatus for sensing inductive load

1994-03-31

1996-06-04

Karlsen, Ernest F.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Demand, excess, maximum or minimum

324111, G01R 1904

Patent

active

055236766

ABSTRACT:
An inductive load energized by a variable duty cycle pulse signal contains ripple at steady state conditions, and the average current is used as feedback to a controller. The average current is obtained without filtering by synchronously sampling the local maxima and minima of the current and averaging the last two samples. The maxima and minima are detected by sampling at the falling and rising edges of the pulse signal. The method is implemented by software in a microprocessor or by hardware comprising a pulse generator, sample and hold circuits, and an averager. The resulting average value is then asynchronously sampled by a microprocessor.

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patent: 4641246 (1987-02-01), Halbert et al.
patent: 4646004 (1987-02-01), Brandt et al.
patent: 4807147 (1989-02-01), Halbert et al.
patent: 5079494 (1992-01-01), Reichard
patent: 5341286 (1994-08-01), Inoue

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