Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific current responsive fault sensor
Patent
1996-10-29
1998-03-10
Gaffin, Jeffrey A.
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific current responsive fault sensor
361 94, G05F 1573
Patent
active
057268495
ABSTRACT:
An input overcurent suppression circuit is used for a DC-DC converter in uninterruptible power supply source and includes a plurality of DC-DC converters, an AC-DC converter and a detecting means for detecting an input current to the DC-DC converters.
In the plural DC-DC converters, a parallel circuit constituted by a resistor element and a switching element is connected in series with an input circuit to break the circuit in response to an overcurrent or over heating. When the power source circuit is closed, a surge current-preventing circuit prevents the surge current by turning a switching element off for a predetermined period of time.
The AC-DC converter feeds current to at least two or more DC-DC converters among the plurality of DC-DC converters.
When the detecting means has detected an overcurrent, the switching element is turned off to turn off the resistor element connected in parallel with the switching element, to thereby suppress the overcurrent flowing into the AC-DC converter.
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patent: 5331532 (1994-07-01), Iwai et al.
patent: 5388022 (1995-02-01), Ahuja
patent: 5440441 (1995-08-01), Ahuja
patent: 5561596 (1996-10-01), Hemena et al.
Fujitsu Limited
Gaffin Jeffrey A.
Jean-Pierre Peguy
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