Power system
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United States of America Patent
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-
Dec 6, 2005
Grant Date -
Dec 2, 2004
app pub date -
Mar 10, 2004
filing date -
Apr 16, 2003
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A power system causes no variation in output voltage during switching from a linear regulator to a DC-DC converter. The power system switches off a drive circuit of a DC-DC converter and supplies voltage to a load from a linear regulator if the load is light, while the power system halts voltage supply to the load from the linear regulator and switches the drive circuit of the DC-DC converter on if the load is heavy. During a set period of time after the load changes from light to heavy, the linear regulator continues to supply voltage to the load while the DC-DC converter supplies a pseudo feedback signal to a control circuit in place of a feedback signal, with the drive circuit left off to control the time ratio at switching elements and, thus minimizing output voltage variations.
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