Power supply control device
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United States of America Patent
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May 25, 1999
Grant Date -
N/A
app pub date -
Nov 25, 1996
filing date -
Nov 30, 1995
priority date (Note) -
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Abstract
A power supply control device, by which a plurality of switching power supply circuits of different properties are operated under switching conditions respectively fitted therefor simultaneously with the prevention of an occurrence of what is called a low-frequency switching beat phenomenon, thereby achieving the miniaturization and the increasing of the efficiency of a power supply unit. To synchronize the timing of switching operations among control systems or units of the power supply control device, the control device of the multi-channel type or the control device having a master-slave function is used. Further, a frequency divider circuit or a frequency multiplier circuit is connected to a comparator of such a control device. Thereby, although synchronizing the timing among the switching operations, a plurality of pulse output signals of different frequencies are outputted from the control systems or the control units. Incidentally, a frequency divider circuit or a frequency multiplier circuit may be added to an oscillation circuit of the control device, instead of connecting the frequency divider circuit or the frequency multiplier circuit to the comparator.
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