Driving apparatus for cross-coil type analog indicating instrume

Details Driving apparatus for cross-coil type analog indicating instrume Driving apparatus for cross-coil type analog indicating instrume

1995-05-16

1996-08-27

Strecker, Gerard R.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Plural active motor elements

324146, G01R 516

Patent

active

055504655

ABSTRACT:
A pulse signal generated by a car speed sensor is converted to an analog voltage by a F-V converter, and two sawtooth signals are formed by two sawtooth current generators based on the analog voltage. The sawtooth currents are then converted into two triangular wave voltages by two I-V converters. Three-stage function generators change the slope of each of the triangular wave voltages step by step and form an approximated sine wave voltage and an approximated cosine wave voltage. A zero-cross compensating circuit is provided in each of the first stage function generators and adjust the triangular voltage to cross zero point.

REFERENCES:
patent: 5121347 (1992-06-01), Yamamoto et al.
patent: 5313155 (1994-05-01), Yamamoto et al.

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