Air core gauge, multi-frequency pulse width modulator system the

Details Air core gauge, multi-frequency pulse width modulator system the Air core gauge, multi-frequency pulse width modulator system the

1992-09-08

1994-05-03

Strecker, Gerard R.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

With electromagnetic field

324143, 324167, 324 7648, 364484, 36457107, 377 19, G01R 516, G01R 2300

Patent

active

053090870

ABSTRACT:
A pulse-width modulation system provides means for controlling dual-coil, air-core gauges at a various rates over 360 degrees. The system moves a dial needle from one octant of the gauge to the next in response to coded data representing measurands by holding one coil at 100% duty cycle while applying a PWM of a varying duty signal to the other coil. When the magnitude of the measurand dictates that the needle should move into another octant of the dial, the PWM signal and the 100% duty cycle signal are interchanged between the coils in a manner permitting the needle to move to other octants of the dial. The system includes a variable PWM count clock that permits selecting at least PWM rates and periods for forming PWM duty cycles ranging from 0% to 100%.

REFERENCES:
patent: 4230984 (1980-10-01), Taylor
patent: 4924178 (1990-05-01), Miyajima
patent: 5017861 (1991-05-01), Hukuda
patent: 5051688 (1991-09-01), Murase et al.

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