US 10,314,134 B1Granted

Retrofit LED lamp

AssigneeSignify Holding B.V.

InventorsXiujuan Wu, Han Lu, Jing Xu Zhou, Jason J Yang, Jessie Wang, Tian Ella

Life of this patent

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Abstract

A retrofit lamp is for use with a fluorescence lighting ballast. The retrofit lamp comprises a filament emulation circuit. A detection circuit detects (at least) if a connected ballast is an instant start electronic ballast or an electromagnetic ballast by detecting a potentially existing heating voltage across the filament emulation circuit. In response, an LED arrangement may be connected in a series configuration (for an instant start electronic ballast) or in a parallel configuration (for an electromagnetic ballast). In this way, the output power is managed to ensure efficient operation. A different pin safety function may also be provided in the different configurations.

Claims15

Dependent claims

A retrofit lamp to be used with a lighting ballast, comprising:

a first pair of connection pins (Pin1, Pin2) and a second pair of connection pins (Pin3, Pin4),
a filament emulation circuit between the connection pins of the first pair and/or between the connection pins of the second pair,
a detection circuit (DET1, DET2) comprising a voltage detection element to react to a potentially existing heating voltage across the filament emulation circuit;
an LED arrangement (D1-D4, D41-D44) comprising at least two LED segments (D1-D4;
D41-D44);
and
a reconfiguration circuit (BD1, BD8, BD12, BD13) adapted to connect the at least two LED segments in a series configuration if the heating voltage is not existing and to connect the at least two LED segments in a parallel configuration if the heating voltage is existing.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 16/135,514Filed 19 Sep 2018
Priority: EP 1817969626 Jun 2018
Granted: 4 Jun 2019
Term ends: Not estimatedThe source records don’t support an estimate.

Classification15 codes

H05B 45/44
Details of LED load circuits: with an active control inside an LED matrix
F21K 9/27
Light sources comprising attachment means: retrofit light sources for lighting devices with two fittings for each light source, e.g. for…
F21V 23/02
Arrangement of electric circuit elements in or on lighting devices: the elements being transformers, impedances or power supply units, e.g. a…
H05B 45/357
Driver circuits: specially adapted for retrofit LED light sources