Method and arrangement in conjunction with emergency light
AssigneeTeknoware Oy
InventorJari Tabell
Life of this patent
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Abstract
A method in conjunction with an emergency light, and an emergency light with equipment comprising one or more LED light sources (52) for producing emergency lighting; a super capacitor (C1) arranged to supply one or more LED light sources (52), a charging apparatus (A) arranged to charge the super capacitor (C1) to a predetermined nominal voltage. The equipment of the emergency light further comprises means for deviating the charging voltage (U) produced by the charging apparatus; and means (C) for detecting the capacitor circuit voltage when the charging voltage is being deviated, the means (C) being arranged to detect a defect in the capacitor circuit in response to the voltage detection.
Claims2
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.
An emergency light with equipment comprising:
- emergency light
- 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 comprising 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 comprising 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 capacitor, the voltage detector being arranged to detect a defect in the capacitor circuit when the output of the voltage detector changes in accordance with the control of the control circuit.
Dependencies are inferred from the claim text.