Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Lumped type parameters
Patent
1994-06-03
1996-05-07
Wieder, Kenneth A.
Electricity: measuring and testing
Impedance, admittance or other quantities representative of...
Lumped type parameters
318254, 340648, 324510, G01R 3134
Patent
active
055149774
ABSTRACT:
A pulse detection and conditioning circuit senses and conditions commutation pulses produced by a DC permanent magnet motor to determine motor position. The pulses are sensed using a resistor coupled in series with the motor, so that motor current and the included pulses are continuously sensed, even during motor braking. The serially coupled resistor also provides for sensing and conditioning of pulses of both polarities produced by bi-directional operation of the motor. The pulse detecting and conditioning is performed by circuitry which performs amplitude qualification as well as frequency filtering to effectively detect valid commutation pulses to the exclusion of noise and other unwanted signals. Capacitors coupled to the motor and internal capacitors provide the frequency filtering, while the amplitude qualification is provided by a balanced differential gain stage coupled through an adjustable differential gain stage with adjustable gain to a unity gain comparator. The adjustable gain of the adjustable differential gain stage and a variable reference voltage within the unity gain comparator provide for adjustable amplitude qualification. A differential to single ended converter responsive to the outputs of the unity gain comparator feeds a threshold latch to initiate the generation of a pulse representing each valid motor pulse.
REFERENCES:
patent: 3708737 (1973-01-01), Johnson
patent: 5023527 (1991-06-01), Erdman et al.
patent: 5202620 (1993-04-01), Kawamura
patent: 5231338 (1993-07-01), Bulgarelli et al.
Bowser Barry C.
Linfinity Microelectronics Inc.
Wieder Kenneth A.
LandOfFree
Pulse detection and conditioning circuit does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Pulse detection and conditioning circuit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Pulse detection and conditioning circuit will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1229630