G - Physics – 11 – B
Patent
G - Physics
11
B
341/107
G11B 15/46 (2006.01) G05B 11/28 (2006.01) H02P 23/00 (2006.01)
Patent
CA 1130420
ABSTRACT OF THE DISCLOSURE In a digital servo control system, the duty cycle of a pulse width modulated signal for controlling a drive motor is determined by digital numbers representing phase and/or speed errors preset into a memory and circulating counter. The cir- culating counter is driven by a clock signal which performs a number of cycles during each basic timing interval. A pulse width modulated signal is initiated by a timing pulse and is terminated by each return to zero of the most significant digit of the circulating counter. The time at which the most signifi- cant digit of the circulating counter returns to zero at the end of each of its cycles is determined by the number initially pre- set into it. The memory is gated with the output of a four-bit counter, which increments at the same rate that the circulating counter cycles, to either lengthen each pulse width modulated signal by one clock cycle or not. The number of times the pulse- width modulated signal is lengthened in a basic timing interval is proportional to the number preset into the memory. The con- tents of the memory and the circulating counter are periodically changed to correspond to detected speed and/or phase errors to update the duty cycle of the pulse width modulated control sig- nal. -1-
333845
Nakamura Tadahiko
Nakano Kenji
Gowling Lafleur Henderson Llp
Sony Corporation
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