Electric power conversion systems – Current conversion – Including an a.c.-d.c.-a.c. converter
Reexamination Certificate
2000-06-06
2001-11-27
Berhane, Adolf Deneke (Department: 2838)
Electric power conversion systems
Current conversion
Including an a.c.-d.c.-a.c. converter
Reexamination Certificate
active
06324082
ABSTRACT:
BACKGROUND
This invention relates generally to the field of power supplies, and, in particular, to standby mode power supplies for television receivers.
The power consumed by electronic equipment in the standby mode is becoming an increasingly visible public policy issue. For example, an article in the Sep. 19, 1997, issue of Europe Energy reports that the European Commission regards reducing the energy consumed by electronic equipment in the standby mode of operation as a priority. The article further states that the Commission has concentrated its initial efforts at reducing the standby power consumption of televisions and VCRs, and that it has elicited voluntary commitments from manufacturers of such products to progressively reduce average standby power consumption.
Modern televisions can have a standby power consumption of about 5 to 10 Watts caused by the degaussing circuit and switched mode power supply running in standby mode. Televisions that have an additional standby power supply and disconnect the degaussing circuit can reduce the power consumption to 1 Watt.
In a conventional power supply arrangement for a video display apparatus, a primary winding of a standby transformer is coupled to the AC mains. A transformed voltage across a secondary winding of the standby transformer is full-wave rectified and is regulated by some form of linear regulation to provide power for the video display apparatus in a standby mode of operation. This standby power supply consumes power as long as the video display apparatus is connected to the AC mains, and thus also consumes power during the run mode of operation. During standby mode, power losses are incurred partly due to switching losses. U.S. Pat. No. 6,043,994 proposes a power supply for reducing standby power consumption attributable to a start-up resistor of the switched mode power supply controller integrated circuit IC.
It is therefore desirable to provide a simple and cost-effective method for reducing the standby power consumption attributable to the switching losses.
SUMMARY
The present invention is directed to a standby power supply circuit that reduces the standby consumption attributable to switching losses from coupling full AC mains to power conversion circuitry. A synchronous burst mode power supply includes a power converter for transforming an AC mains from a relatively low frequency to a higher frequency; and a gate circuit responsive to the AC mains supply for enabling the power converter to initiate a burst of output pulses at the higher frequency each time the AC mains supply occurs within a predetermined range. A method for providing synchronous burst mode power includes the steps of receiving an AC mains supply at a relatively low frequency, detecting when the AC mains supply occurs within a predetermined range, and initiating a burst of output pulses at a higher frequency than the relatively low frequency in response to the detecting step.
The above, and other features, aspects, and advantages of the present invention will become apparent from the following description read in conjunction with the accompanying drawings, in which like reference numerals designate the same elements.
REFERENCES:
patent: 3710062 (1973-01-01), Peters, Jr.
patent: 4751580 (1988-06-01), Fitzgerald et al.
patent: 5099407 (1992-03-01), Thorne
patent: 5369561 (1994-11-01), McCullough
patent: 5982645 (1999-11-01), Levran et al.
patent: 5995388 (1999-11-01), Preller
patent: 6043994 (2000-03-01), Keller
Berhane Adolf Deneke
Kolodka Joseph J.
Laks Joseph J.
Thomson Licensing S.A.
Tripoli Joseph S.
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