Electricity: power supply or regulation systems – Output level responsive – Using a three or more terminal semiconductive device as the...
Reexamination Certificate
2005-06-28
2005-06-28
Tso, Edward H. (Department: 2838)
Electricity: power supply or regulation systems
Output level responsive
Using a three or more terminal semiconductive device as the...
C323S351000, C323S285000
Reexamination Certificate
active
06911808
ABSTRACT:
A reference voltage register stores a reference value Vref indicating the output voltage Vout of a power supply circuit. A digital filter amplifies the difference between the output voltage Vout from the power supply circuit and the reference value Vref stored in the reference voltage register. A pulse width computation unit computes the duty such that the output voltage Vout matches the reference value Vref, and generates the on-time of a pulse signal corresponding to the duty. A reference value operation unit updates the reference voltage register depending on the output current from the power supply circuit or the temperature around the power supply circuit.
REFERENCES:
patent: 5475296 (1995-12-01), Vinsant et al.
patent: 5747977 (1998-05-01), Hwang
patent: 5929619 (1999-07-01), Chin et al.
patent: 5969515 (1999-10-01), Oglesbee
patent: 64-72215 (1989-03-01), None
patent: 2-55573 (1990-02-01), None
patent: 2-184265 (1990-07-01), None
Armstrong Westerman Hattori McLeland & Naughton LLP
Fujitsu Limited
Tso Edward H.
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