Electricity: power supply or regulation systems – Output level responsive – Using a three or more terminal semiconductive device as the...
Reexamination Certificate
2007-07-17
2007-07-17
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
11181780
ABSTRACT:
The present invention discloses a DC-to-DC step-up converter to which a logic control unit is added in order to reduce the ripples of a DC output voltage and improve the power quality. The converter of the present invention comprises a step-up circuit, a ring oscillator, a divider circuit, a PFM (pulse frequency modulation) comparator and a logic control unit. The step-up circuit is used to step up a source voltage to generate a DC output voltage. The ring oscillator is used to generate an oscillator output signal. The divider circuit receives the DC output voltage to generate a feedback voltage. The PFM comparator compares the feedback voltage with a reference voltage to generate a comparator output signal to control outputting of the oscillator output signal. The logic control unit is used to make the conductive period of a MOS transistor in the step-up circuit identical to the high-level period of an output signal of the ring oscillator to reduce the noise and the ripple of the DC output voltage of the converter.
REFERENCES:
patent: 6492862 (2002-12-01), Nakahara
patent: 6977828 (2005-12-01), Wada
A Master Thesis of Graduate Institute of Electrical Engineering, Feng Chia University, Taiwan—Low Current, Pulse-Frequency Modulation Converter.
Chu Chu Yu
Jian Mao Cyuan
Liao Shih Jie
Sun You Min
Advanced Analog Technology, Inc.
Berhane Adolf
Volentine & Whitt PLLC
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