Amplifiers – Modulator-demodulator-type amplifier
Reexamination Certificate
2006-05-19
2008-03-04
Nguyen, Patricia (Department: 2817)
Amplifiers
Modulator-demodulator-type amplifier
C330S289000, C330S298000, C330S20700P
Reexamination Certificate
active
07339424
ABSTRACT:
In an embodiment of this invention, if a state, in which duty ratio of a PWM signal is kept equal to or greater than a predetermined value, has been maintained for a first time period, the duty ratio of the PWM signal of a digital power amplifier is adjusted downward. Furthermore, the duty ratio of the PWM signal is maintained without change when the duty ratio of the PWM signal is adjusted downward for a second time period, and the duty ratio of the PWM signal is adjusted downward only when volume is set to a maximum value allowable in the power amplifier. Accordingly, the temperature of the power amplifier can be prevented from rapidly increasing, the internal temperature of an electronic apparatus can be efficiently prevented from increasing, and damage to the power amplifier resulting from increased temperature can be prevented.
REFERENCES:
patent: 5418435 (1995-05-01), Yamada
patent: 5515258 (1996-05-01), Viertler
patent: 6434025 (2002-08-01), Shirai et al.
patent: 6770985 (2004-08-01), Yabe et al.
patent: 7113376 (2006-09-01), Nomura et al.
patent: 7132818 (2006-11-01), Matsuura
patent: 2006/0097765 (2006-05-01), Asada
Birch & Stewart Kolasch & Birch, LLP
LG Electronics Inc.
Nguyen Patricia
LandOfFree
Apparatus and method for controlling temperature of... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Apparatus and method for controlling temperature of..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Apparatus and method for controlling temperature of... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3969698