INTRINSICALLY SAFE BACKUP POWER SUPPLY FOR COMBUSTIBLE ENVIRONMENTS
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United States of America Patent
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Issued Date -
Aug 1, 2013
app pub date -
Oct 18, 2010
filing date -
Oct 18, 2010
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
An intrinsically safe supply for supplying back-up power during a power-out event incorporates one or more rechargeable fuel cells. The power supply is provided with switching circuitry operable to provide an output back-up current from the fuel cells upon a power-out event. The fuel cells are housed within a sealed metal housing immersed within an electricity insulating potting material chosen to arrest spark formation and/or electrically insulate any created sparks. The fuel cells comprise sealed lithium iron based fuel cells for supplying back-up electrical current. A charging circuit electrically connects the fuel cells with an external power source for providing a charging current during normal power-on conditions.
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