US 2025/0168950 A1Published application

Protection circuit for multi-channel LED luminaire

AssigneeSignify Holding B.V.

InventorsYUHONG FANG, BERND CLAUBERG

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Abstract

A protection circuit for a multi-channel LED luminaire is provided. Each LED channel is powered by a single power supply circuit via a supply signal. In one aspect, a total error circuit compares the total current flowing through each LED channel to a total current limit, and triggers the power supply circuit to adjust the supply signal based on the comparison. This adjustment results in total current flowing through the LED channels to remain constant, while also conforming to the desired lighting output. In another aspect, the comparator circuit compares the total current to the summation of the individual currents flowing through each LED channel to determine if a fault, such as a short circuit, has occurred. Detection of the fault is triggers the power supply to limit or disable the supply signal, limiting damage to the luminaire, and protecting the safety of users.

Claims13

Dependent claims

A protection circuit for a multi-channel light emitting diode luminaire, comprising:

a first current sensing circuit electrically coupled to a first LED channel, the first current sensing circuit configured to generate a first sensed signal corresponding to the first LED channel;
a second current sensing circuit electrically coupled to a second LED channel, the second current sensing circuit configured to generate a second sensed signal corresponding to the second LED channel;
a total current sensing circuit electrically coupled to the first current sensing circuit and the second current sensing circuit, the total current sensing circuit configured to generate a total sensed signal;
a total error circuit configured to generate a total error signal based on the total sensed signal and a total current limit signal, wherein the total error signal triggers a power supply circuit to adjust a supply signal provided to the first LED channel or the second LED channel;
a summing circuit configured to generate a combined channel signal based on the first sensed signal, the second sensed signal, and an offset signal;
and
a comparator circuit configured to generate a comparison signal based on the combined channel signal and the total sensed signal, wherein the power supply circuit limits or disables the supply signal based on the comparison signal.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 18/837,676Filed 14 Feb 2023
Priority: EP 22159892.33 Mar 2022
Published: 22 May 2025
Term ends: Not estimatedThe source records don’t support an estimate.

Classification6 codes

H05B 45/50
Circuit arrangements for operating light-emitting diodes [LED]: responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED…
H05B 45/52
Responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits: in a parallel array of LEDs
H05B 45/46
With an active control inside an LED matrix: having LEDs disposed in parallel lines
Y02B 20/30
Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps: semiconductor lamps, e.g. solid state lamps [SSL] light…

Family

Application63/312,314Us provisional application · filed 21 Feb 2022
US 12,666,515 B2Related patent
US 2025/0168950 A1This patent

From the US filing history. Foreign family members aren’t listed.

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