Digital motor controller for color wheel

Details Digital motor controller for color wheel Digital motor controller for color wheel

1994-11-14

1997-04-29

Lee, Michael

Television

Video display

Color sequential

318807, 318811, H04H 912

Patent

active

056254245

ABSTRACT:
A digital motor controller (17) for controlling both the phase and speed of a brushless DC motor (16). An error detection unit (21) detects a speed error or a phase error. An error logic unit (22) uses the error to determine a speed control value, that is proportional to represent an average motor input voltage that varies from the current input voltage by an amount determined by the error. A pulse width modulation unit (23) receives the speed control value and uses it to determine the duty cycle for the motor drive signals. A commutation unit (24) modulates the appropriate drive signal, and a drive stage (27) delivers the drive signals to the motor (16).

REFERENCES:
patent: 4843288 (1989-06-01), Volz et al.
patent: 4896244 (1990-01-01), Kalina
patent: 5057753 (1991-10-01), Leuthold et al.
patent: 5350988 (1994-09-01), Le
patent: 5365283 (1994-11-01), Doherty et al.
patent: 5428285 (1995-06-01), Koyama et al.

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