Electricity: power supply or regulation systems – Output level responsive – Using a three or more terminal semiconductive device as the...
Reexamination Certificate
2009-10-29
2011-11-01
Laxton, Gary L (Department: 2838)
Electricity: power supply or regulation systems
Output level responsive
Using a three or more terminal semiconductive device as the...
C323S284000, C363S021050, C363S021130
Reexamination Certificate
active
08049481
ABSTRACT:
Adaptive multi-mode digital control schemes that improve the light-load efficiency (and thus the overall average efficiency) in switch-mode power converters without causing performance issues such as audible noises or excessive voltage ripples. Embodiments include a switch-mode power converter that reduces current in the power converter using a second pulse-width-modulation (PWM) mode before reaching switching frequencies that generate audible noises. As the load across the output of the power converter is reduced, the power converter transitions from a first PWM mode in high load conditions to a first pulse-frequency-modulation (PFM) mode, then to a second PWM mode, and finally to a second PFM mode. During the second PFM mode, the switching frequency is dropped to audible frequency levels. Current in the power converter, however, is reduced in the second PWM mode before transitioning to the second PFM mode. Therefore, the power converter produces less or no audible noise in light load conditions where the switching frequency drops to audible frequency levels, while achieving high efficiency across varying load conditions.
REFERENCES:
patent: 5657215 (1997-08-01), Faulk
patent: 7098641 (2006-08-01), King
patent: 7368897 (2008-05-01), Qahouq et al.
patent: 7679938 (2010-03-01), Ye et al.
patent: 7826237 (2010-11-01), Zhang et al.
PCT International Search Report and Written Opinion, PCT Application No. PCT/US2009/064618, Jan. 13, 2010, 8 pages.
Kesterson John W.
Li Yong
Poon Clarita
Seim Carrie
Shi Fuqiang
Fenwick & West LLP
iWatt Inc.
Laxton Gary L
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