Electricity: power supply or regulation systems – In shunt with source or load – Using choke and switch across source
Reexamination Certificate
2007-08-28
2007-08-28
Patel, Rajnikant B. (Department: 2838)
Electricity: power supply or regulation systems
In shunt with source or load
Using choke and switch across source
C323S901000, C363S061000, C363S065000
Reexamination Certificate
active
11248187
ABSTRACT:
In a switching power supply circuit, completion of discharging of a capacitance provided in a soft-start circuit requires a period longer than a cycle with which an activating/deactivating portion switches switching control operation of a driving portion (which performs switching control to turn on/off a switching device provided in a stepping-up DC-DC converter) between an activated state and a deactivated state. Moreover, the soft-start circuit is prevented from performing soft-start operation until discharging of the capacitance is completed. Furthermore, the activating/deactivating portion prevents the switching control operation of the driving portion from being switched from the deactivated state to the activated state from a time point that constant voltage feeding operation of a constant voltage portion (which feeds, to a comparing portion that sends an output signal to the driving portion, a constant voltage as the drive voltage) is switched from the deactivated state to the activated state until a predetermined period elapses.
REFERENCES:
patent: 6201674 (2001-03-01), Warita et al.
patent: 6624619 (2003-09-01), Fujita et al.
patent: 6650555 (2003-11-01), Suzuki et al.
patent: 6657876 (2003-12-01), Satoh
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patent: 11-069793 (1999-03-01), None
Inaba Katsumi
Kanamori Atsushi
Satoh Tsutomu
Warita Hirohisa
Birch & Stewart Kolasch & Birch, LLP
Patel Rajnikant B.
Sharp Kabushiki Kaisha
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