Power failure-free power supply apparatus
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United States of America Patent
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Aug 29, 2000
Grant Date -
N/A
app pub date -
Oct 12, 1999
filing date -
Oct 12, 1998
priority date (Note) -
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Abstract
A power failure-free power supply apparatus capable of minimizing time required for parallel operation of a power rectifier and a power rectifier/inverter, to thereby minimize a deterioration in operational reliability. The power rectifier converts an output of an AC power supply into DC power. A power inverter converts DC power into AC one. The power rectifier/inverter carries out rectifying/inverting operation. An output of the power rectifier and an AC output of the power rectifier/inverter are fed through a change-over unit to a load. Operation of switches is controlled depending on a detection signal of a current detector for detecting a charging current of a storage battery. A control unit permits parallel operation of the power rectifier and power rectifier/inverter when a residual capacity of the storage battery is at an increased level and permits the storage battery to be charged when the residual capacity is at a reduced level. An increase in charging current during the parallel operation minimizes time required for the parallel operation.
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