Electricity: power supply or regulation systems – Output level responsive – Using a three or more terminal semiconductive device as the...
Reexamination Certificate
2007-08-07
2007-08-07
Patel, Rajnikant B. (Department: 2838)
Electricity: power supply or regulation systems
Output level responsive
Using a three or more terminal semiconductive device as the...
C323S282000, C327S553000
Reexamination Certificate
active
10970757
ABSTRACT:
A power supply apparatus switchably operates an LDO regulator and a DC/DC converter connected in parallel so as to control a battery voltage Vbat from a power supply at a constant output voltage VO. A detected voltage Vs at a shared output terminal shared by the LDO regulator and the DC/DC converter is input to a feedback input terminal and fed back to the LDO regulator and the DC/DC converter. In order to suppress an undershoot occurring when switching from the LDO regulator to the DC/DC converter, a timing signal generating unit supplies a capability switching timing signal to a pre-drive circuit and switches the control capability of the DC/DC converter from a low capability mode at startup to a high capability mode.
REFERENCES:
patent: 4146832 (1979-03-01), McConnell
patent: 6229289 (2001-05-01), Piovaccari et al.
patent: 7002329 (2006-02-01), Agari et al.
patent: 2003-009515 (2003-01-01), None
patent: 2003-216247 (2003-07-01), None
Notification of Reason(s) for Refusal for Japanese Patent Application No. 2003-363896 dated Nov. 8, 2005 with partial English translation.
Japanese Office Action for corresponding Japanese Patent Application No. 2003-363896 dated Aug. 30, 2005 with English translation.
Tamegai Yoichi
Yamamoto Isao
Cantor & Colburn LLP
Patel Rajnikant B.
Rohm & Co., Ltd.
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