Power supply unit and portable apparatus using the same
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United States of America Patent
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-
Jul 8, 2008
Grant Date -
Sep 1, 2005
app pub date -
Dec 7, 2004
filing date -
Dec 10, 2003
priority date (Note) -
In Force
status (Latency Note)
Importance
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.
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