Electrical transmission or interconnection systems – Switching systems – Condition responsive
Patent
1998-03-24
1999-08-03
Paladini, Albert W.
Electrical transmission or interconnection systems
Switching systems
Condition responsive
323241, 323246, 323265, 323275, 323282, H02M 302
Patent
active
059329386
ABSTRACT:
A switching power supply unit controls an output voltage of a power supply without monitoring an output voltage. The switching power supply unit includes a pulse width modulator for generating a control signal to turn on and off a switching transistor. A central processing unit outputs a modulation signal to control the pulse width modulator while sensors detect an input voltage, an output current and a peripheral temperature. A table is used by the central processing unit to store information about a relation between the detected values from the sensors and an ON time of the switching transistor. The central processing unit then selects an ON time of the switching transistor from the table according to values detected by the respective sensors to thereby provide control for switching the switching transistor on and off. The switching transistor is switched according to the selected time and to thereby switch an input voltage in response to changes of an input voltage, an output current and a peripheral temperature without monitoring an output voltage. Furthermore, the output voltage can be maintained with stability at a desired output voltage.
REFERENCES:
patent: 4563733 (1986-01-01), Schlenk
patent: 4954767 (1990-09-01), Buisson et al.
patent: 5345376 (1994-09-01), Nourbakhsh
patent: 5530879 (1996-06-01), Crump et al.
patent: 5621629 (1997-04-01), Hemminger et al.
Fujitsu Limited
Paladini Albert W.
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