Power supply unit and portable apparatus using the same

Details Power supply unit and portable apparatus using the same Power supply unit and portable apparatus using the same

2004-12-07

2008-07-08

Sherry, Michael J (Department: 2836)

Electrical transmission or interconnection systems

Miscellaneous systems

Power packs

C323S268000, C323S225000

Reexamination Certificate

active

07397151

ABSTRACT:
A power supply unit comprises a series regulator and a switching DC-DC converter controlled by a PWM signal and connected in parallel with the series regulator, which are switchably enabled by a mode instruction signal depending on the magnitude of a load current. In switching the series regulator and the DC-DC converter, they are simultaneously enabled for a predetermined overlapping time. Further, in changing the operating condition of the DC-DC converter, the width of the PWM signal is shortened to extend the dead time of the DC-DC converter by a predetermined period, thereby suppressing free oscillations and accompanying overshoots that could take place in the power supply unit during switching.

REFERENCES:
patent: 6072333 (2000-06-01), Tsukagoshi et al.
patent: 6646424 (2003-11-01), Zinn et al.
patent: 6972546 (2005-12-01), Kobayashi
patent: 2003/0193318 (2003-10-01), Ozawa et al.
patent: 2001-211640 (2001-08-01), None
patent: 2002-300769 (2002-10-01), None

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