Pulse or digital communications – Transmitters – Antinoise or distortion
Patent
1997-04-08
2000-02-15
Vo, Don N.
Pulse or digital communications
Transmitters
Antinoise or distortion
363 46, 330 10, H04K 102, H04L 2503
Patent
active
060261269
ABSTRACT:
A method and apparatus reduces an output ripple signal of a power supply (200) for supplying a DC voltage and current to a load. One of the output ripple signal and an intermediate ripple signal is sensed to produce a control signal at a ripple sensing element (206), and a rectangular pulse carrier signal is generated by a pulse width modulator (302), the signal having a duty cycle modulated with the control signal to produce a pulse width modulated (PWM) signal carrying ripple signal energy. The rectangular pulse carrier signal operates at a frequency substantially higher than the control signal. The PWM signal is coupled into a portion of the power supply through a transformer (202). The transformer is arranged such that the PWM signal is combined with the intermediate ripple signal at an amplitude and relative phase sufficient to substantially reduce the output ripple signal.
REFERENCES:
patent: 4344126 (1982-08-01), Schumacher
patent: 4667279 (1987-05-01), Maier
patent: 4682369 (1987-07-01), Schrader
patent: 4727874 (1988-03-01), Bowers et al.
patent: 5237492 (1993-08-01), King
patent: 5343079 (1994-08-01), Mohan et al.
patent: 5471378 (1995-11-01), King
patent: 5559467 (1996-09-01), Smedley
Breeden R. Louis
Motorola Inc.
Phu Phuong
Vo Don N.
LandOfFree
Method and apparatus for reducing a ripple signal in an output o does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and apparatus for reducing a ripple signal in an output o, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for reducing a ripple signal in an output o will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1911968