Self-checking emergency light unit and method of operating a self-checking emergency light unit
First Claim
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1. Self-checking emergency light unit for a passenger transport comprising:
- a power input terminal coupleable to an external power supply for receiving power therefrom,an illumination circuit coupled to the power input terminal, the illumination circuit comprising at least one light source,an emergency power source coupled to the power input terminal and to the illumination circuit, wherein the emergency power source is adapted to store electrical energy received via the power input terminal and to provide electrical energy to the illumination circuit in an emergency operation,a discharge circuit coupled to the emergency power source, wherein the discharge circuit is adapted to effect a discharge of the emergency power source in a power down operation, andan operational check module coupled to the emergency power source, wherein the operational check module is configured to sense at least one electric characteristic of the emergency power source during the power down operation and to determine an operational status of the emergency power source from the at least one electric characteristic during the power down operation,wherein the operational status is by default set to indicate a malfunction of the emergency powers source after a power up operation and wherein the operational status indicates a proper functioning of the emergency power source after the power down operation if the at least one electric characteristic complies with one or more preset criteria for the power down operation.
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Abstract
A self-checking emergency light unit includes a power input terminal coupleable to an external power supply for receiving power therefrom, an illumination circuit coupled to the power input terminal, a discharge circuit coupled to the emergency power source, and an operational check module coupled to the emergency power source.
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Citations
14 Claims
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1. Self-checking emergency light unit for a passenger transport comprising:
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a power input terminal coupleable to an external power supply for receiving power therefrom, an illumination circuit coupled to the power input terminal, the illumination circuit comprising at least one light source, an emergency power source coupled to the power input terminal and to the illumination circuit, wherein the emergency power source is adapted to store electrical energy received via the power input terminal and to provide electrical energy to the illumination circuit in an emergency operation, a discharge circuit coupled to the emergency power source, wherein the discharge circuit is adapted to effect a discharge of the emergency power source in a power down operation, and an operational check module coupled to the emergency power source, wherein the operational check module is configured to sense at least one electric characteristic of the emergency power source during the power down operation and to determine an operational status of the emergency power source from the at least one electric characteristic during the power down operation, wherein the operational status is by default set to indicate a malfunction of the emergency powers source after a power up operation and wherein the operational status indicates a proper functioning of the emergency power source after the power down operation if the at least one electric characteristic complies with one or more preset criteria for the power down operation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. Method of operating a self-checking emergency light unit having an emergency power source, an illumination circuit with at least one light source, and a discharge circuit, the method comprising the steps of:
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charging the emergency power source in a power up operation, with the emergency power source ensuring provision of power to the illumination circuit in an emergency operation, discharging the emergency power source via the discharge circuit in a power down operation, monitoring at least one electric characteristic of the emergency power source during the power down operation, and determining an operational status of the emergency power source on the basis of the monitoring of the at least one electric characteristic of the emergency power source during the power down operation, wherein the operational status is by default set to indicate a malfunction of the emergency power source after a power up operation and wherein the operational status indicates a proper functioning of the emergency power source after the power down operation if the at least one electric characteristic complies with one or more preset criteria for the power down operation. - View Dependent Claims (13, 14)
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Specification