Pulse width modulation driving circuit for a cross coil meter

Details Pulse width modulation driving circuit for a cross coil meter Pulse width modulation driving circuit for a cross coil meter

1992-04-13

1994-03-01

Wieder, Kenneth A.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

With electromagnetic field

324143, G01R 1136, G01R 1130

Patent

active

052911268

ABSTRACT:
A meter drive apparatus using a counter for counting reference clocks and a comparator for comparing the output value of the counter and the data indicating a directive target of a meter. The output of the comparator is supplied to steering logic where the sign of a current flowing a drive coil of the meter is determined. When supplying the counted value of the counter to the comparator, parallel bits indicating the counted value are cyclically changed. The output of the comparator is PWM-modulated to drive the meter. The effective frequency of PWM waveform is increased, compared to the direct PWM modulation based on the data indicating the directive target of the meter. With this meter drive apparatus, the frequency of the reference clocks may be relatively low.

REFERENCES:
patent: 4096475 (1978-06-01), Ong
patent: 4230984 (1980-10-01), Taylor
patent: 4532496 (1985-07-01), Ichinose
patent: 4928060 (1990-05-01), Ito
patent: 4991098 (1991-02-01), Dantzler
patent: 5017861 (1991-05-01), Hukuda
patent: 5051688 (1991-09-01), Murase et al.
patent: 5097203 (1992-03-01), Haussmann et al.
patent: 5121347 (1992-06-01), Yamamoto et al.
Patent Abstracts of Japan, vol. 11, No. 104, JP-A-61 251 321, Nov. 8, 1986.

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