Electricity: power supply or regulation systems – Output level responsive – Using a three or more terminal semiconductive device as the...
Reexamination Certificate
2007-02-06
2007-02-06
Berhane, Adolf (Department: 2838)
Electricity: power supply or regulation systems
Output level responsive
Using a three or more terminal semiconductive device as the...
Reexamination Certificate
active
11308681
ABSTRACT:
A boost DC/DC converter, including a mask circuit, a switched boost circuit, a pulse width modulation (PWM) circuit and an AND gate, is provided. The mask circuit is used to output a mask signal according to a load current. In the present invention, the system can selectively operate in the pulse width modulation mode, the pulse frequency modulation (PFM) mode or the mixed pulse mask mode according to the mask signal corresponding to the load current when the system is under light load, medium load or heavy load respectively, so as to achieve optimal system efficiency.
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patent: 6803752 (2004-10-01), Chen
patent: 6867634 (2005-03-01), Aiello et al.
patent: 6933706 (2005-08-01), Shih
patent: 7042743 (2006-05-01), Pidutti et al.
patent: 7088084 (2006-08-01), Sakurai et al.
patent: 7095220 (2006-08-01), Kernahan
“Low-Noise Step-Up DC-DC Converters” Maxim Integrated Products, pp. 1-14, 120 San Gabriel Drive, Sunnyvale, CA, USA, 2004.
Chen Ke-Horng
Chen Shih-Min
Hsu Ming-Tan
Peng Chien-Fang
Berhane Adolf
Chunghwa Picture Tubes Ltd.
Jiang Chyun IP Office
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