Method of impulse acreage modulation digital power...

Details Method of impulse acreage modulation digital power... Method of impulse acreage modulation digital power...

2002-12-03

2008-07-29

Pascal, Robert (Department: 2817)

Amplifiers

Modulator-demodulator-type amplifier

C330S251000, C330S20700P

Reexamination Certificate

active

07405615

ABSTRACT:
The present invention relates to a method and apparatus of processing digital power with pulse area modulation. This apparatus is composed of a front end circuit (1), a double limit delay comparison circuit (2), an integrating circuit (7), a drive circuit (3), a switching circuit (4), a power source (5) and a filter circuit (6). The double limits of signal and feedback comparison signal will be compared in the double limit delay comparison circuit. When the value of feedback comparison signal is greater than the upper limit, the double limit delay comparison circuit will output a low level. When the value of feedback comparison signal is smaller than the lower limit, the double limit delay comparison circuit will output a high level. Integrating circuit samples from the output of main switching circuit, and then sends a feedback signal (Y) to the double limit delay comparison circuit. The feedback signal is the average output of actual pulse area, which is consistent with signal (S) and also overlaps fluctuate showing whether pulse exists or not and being related to pulse.

REFERENCES:
patent: 5815581 (1998-09-01), Andersson
patent: 6476673 (2002-11-01), Takagishi
patent: 2005/0069049 (2005-03-01), Fang et al.
patent: WO 95/34941 (1995-12-01), None
patent: WO 98/44626 (1998-10-01), None
patent: WO 99/20004 (1999-04-01), None
patent: WO 00/07291 (2000-02-01), None
patent: WO 03/049290 (2003-06-01), None

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