Step-up switching voltage regulator circuit

Details Step-up switching voltage regulator circuit Step-up switching voltage regulator circuit

2005-08-26

2009-08-11

Ullah, Akm E (Department: 2838)

Electricity: power supply or regulation systems

Output level responsive

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

C323S284000

Reexamination Certificate

active

07573248

ABSTRACT:
A power voltage of a battery (including a secondary battery) mounted on a portable device drops with use or the like of the portable device. Therefore, a step-up switching voltage regulator circuit is mounted on the portable device. On the other hand, the power voltage of the battery exceeds a voltage necessary for driving the portable device sometimes when the battery is fully charged. In this case, when the step-up switching voltage regulator circuit is driven, the power is consumed in vain, and a burden is imposed on the battery. The step-up switching voltage regulator circuit of the present embodiment switches an output in accordance with the power voltage, that is, raises the power voltage supplied from the battery to a predetermined output voltage, and outputs the output voltage, when the power voltage supplied from the battery is smaller than the predetermined output voltage; on the other hand, the step-up switching voltage regulator circuit outputs the power voltage supplied from the battery as the output voltage, when the power voltage supplied from the battery is larger than the predetermined output voltage; and consequently, in the step-up switching voltage regulator circuit, the burden on the battery mounted on the portable device can be reduced.

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patent: 6189462 (1994-07-01), None
English language abstract of Publication No. JP6189462 dated Jul. 8, 1994, esp@cenet database, 1 page.
Office Action dated Jun. 8, 2007, issued by the China Patent Office in corresponding Application No. 2005/10083637.2, 4 pages.

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