FAIL SAFE CIRCUIT

Apparatus for preventing output of an input signal is disclosed, which comprises a signal control unit comprising a buffering unit having an input and an output, the buffering unit arranged to receive an input signal and pass the input signal to the output when the buffering unit is powered. A negat...

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Bibliographische Detailangaben
Hauptverfasser:	WAIN RICHARD MARK, HARGIS COLIN, SYKES ANDREW JEREMY
Format:	Patent
Sprache:	eng
Schlagworte:	APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC,OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWERSUPPLY SYSTEMS CONTROL OR REGULATION THEREOF CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER CONVERSION OR DISTRIBUTION OF ELECTRIC POWER ELECTRICITY EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS GENERATION
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Beschreibung
Zusammenfassung:	Apparatus for preventing output of an input signal is disclosed, which comprises a signal control unit comprising a buffering unit having an input and an output, the buffering unit arranged to receive an input signal and pass the input signal to the output when the buffering unit is powered. A negative power supply terminal of the buffering unit is supplied by a power source. The signal control unit also comprises a boost circuit to boost the voltage of the power source and supply either the voltage of the power source or the boosted voltage to a positive power supply terminal of the buffering unit. The buffering unit is powered when the boosted voltage is supplied to the buffering unit and the buffering unit is not powered when voltage of the power supply terminal is supplied to the positive power supply terminal of the buffering unit.