Patent ID: 8274175
Filing Date: 2012-09-25
Classification: H02J

Abstract:
1. An emergency light with equipment comprising at least one LED light source for producing emergency lighting; at least one super capacitor arranged to supply the at least one LED light source, a charging apparatus arranged to charge the super capacitor to a predetermined nominal voltage, means for deviating the charging voltage produced by the charging apparatus including a control circuit arranged to control the charging apparatus to drop the voltage produced by the charging apparatus in accordance with the control signal of the control circuit; and means for detecting the capacitor circuit voltage when the charging voltage is being deviated, the means for detecting being arranged to indicate a defect in the capacitor circuit in response to the voltage detection, the means for detecting including a resistor connected in parallel with the capacitor and a diode connected to the charging current path of the capacitor, and a voltage detector determining the voltage across the diode, the voltage detector being arranged to detect a defect in the capacitor circuit when the output of the voltage detector remains substantially unchanged despite the control of the control circuit.