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US 2025/0052401 A1Published application
Hybrid led / photoluminescent signs
AssigneeEcoglo International Limited
InventorsRoger MCKENZIE, Trevor DIMOND
Life of this patent
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Abstract
The invention relates to photoluminescent signs, in particular to signs in which one or more light emitting diodes (LEDs) emit light that excites one or more photoluminescent (PL) elements. In one aspect, a sign may include one or more photoluminescent elements; one or more light emitting diodes (LEDs) arranged to excite the one or more photoluminescent elements; and circuitry arranged for connection to an AC power supply and supplying power to the LEDs.
Claims18
A sign comprising:
- one or more photoluminescent elements;
- and
- an electrical circuit comprising
- an AC circuit;
- a rectifier;
- and
- a DC circuit portion;
- wherein the DC circuit portion comprises one or more light emitting diodes (LEDs), the one or more light emitting diodes (LEDs) arranged to excite the one or more photoluminescent elements;
- wherein the AC circuit is connected to an AC power source and supplies power to the rectifier and the rectifier supplies a rectified power supply to the DC circuit portion;
- wherein the AC circuit receives AC power from an AC source, the AC circuit configured to reduce a transient current supplied to the rectifier;
- wherein the AC circuit comprises
- a first transient suppression circuit used during normal operation, where power runs in series through at least two capacitors and at least two resistors to the rectifier, the first transient suppression circuit configured to act to reduce a voltage and current of the AC source to a level suitable for powering the LEDs.
9 more elements
Dependencies are inferred from the claim text.