Pulse width modulation based digital incremental encoder

Details Pulse width modulation based digital incremental encoder Pulse width modulation based digital incremental encoder

2006-03-21

2006-03-21

JeanPierre, Peguy (Department: 2819)

Coded data generation or conversion

Digital pattern reading type converter

Incremental

C341S016000

Reexamination Certificate

active

07015832

ABSTRACT:
A digital incremental encoder for generating an output signal indicative of an angular position, a direction of rotation, and a speed of rotation of a shaft. A counter receives a PWM signal indicative of the angular position of the shaft and a clock signal from an angular position sensor, and generates a multi-bit output. A latch latches the multi-bit output, a first bit and a second bit of which are used to generate the output signals that include the first bit. The first bit and the second bit may be XOR'd together to generate an XOR output included in the output signals. A direction of rotation may be derived from a quadrature phase relationship between the first bit and the XOR output. The angular position sensor may be an NCAPS or MT-NCAPS. A linear position sensor may be used instead of an angular position sensor to generate the PWM signal.

REFERENCES:
patent: 5280238 (1994-01-01), Tsuchiya et al.
patent: 6304076 (2001-10-01), Madni et al.
Asad M. Madni, et al.,The Next Generation of Position Sensing Parts 1 and 2: SENSORS The Journal of Applied Sensing Tchnology, Mar. & Apr. 2001, vol. 18, No. 3 & 4, An Advanstar Publication, 16 pages.

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