Method for regulating a voltage and circuit therefor

Details Method for regulating a voltage and circuit therefor Method for regulating a voltage and circuit therefor

2011-07-12

2011-07-12

Berhane, Adolf (Department: 2838)

Electricity: power supply or regulation systems

Output level responsive

Using a three or more terminal semiconductive device as the...

C323S282000, C323S288000

Reexamination Certificate

active

07977929

ABSTRACT:
A voltage regulator (10) having an undervoltage protection circuit11and a method for protecting against an output voltage out being less than a predetermined level. The voltage regulator has an undershoot limitation circuit (11) coupled between a feedback network (30) and a regulation section (42). A power factor correction circuit (46) is connected to the regulation section. An output voltage out from the power factor correction circuit (46) is fed back to the feedback network (30), which transmits a portion of the output voltage to the undershoot limitation circuit (11). If the output voltage is greater than the predetermined voltage level, a switching circuit portion (34) of the undershoot limitation circuit (11) transmits a normal control signal to the regulation circuit (42). If the output voltage is less than the predetermined voltage level, the switching circuit portion transmits an enhanced control signal to the regulation circuit. The enhanced control signal quickly brings the output voltage up to at least the minimum desired level.

REFERENCES:
patent: 6552517 (2003-04-01), Ribellino et al.
patent: 6828766 (2004-12-01), Corva et al.
patent: 7045993 (2006-05-01), Tomiyoshi
patent: 7239120 (2007-07-01), Adragna et al.
patent: 2002/0135341 (2002-09-01), Eagar
patent: 2008/0036440 (2008-02-01), Garmer

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