Solid state lighting apparatus and methods of forming
First Claim
Patent Images
1. A solid state lighting apparatus comprising:
- a rectifier circuit mounted on a surface of a substrate housed in the solid state lighting apparatus, coupled to an ac voltage source configured to provide a rectified ac voltage to the substrate;
a current source circuit mounted on the surface of the substrate, coupled to the rectifier circuit;
a string of light emitting diode (LED) sets, mounted on the surface of the substrate, coupled in series with one another and to the current source circuit; and
a plurality of current diversion circuits mounted on the surface of the substrate, respective ones of which are coupled to respective nodes of the string and configured to operate responsive to bias state transitions of respective ones of the LED sets.
3 Assignments
0 Petitions
Accused Products
Abstract
A solid state lighting apparatus can include a substrate having first and second opposing surfaces, where at least one of the opposing surfaces is configured to mount devices thereon. A string of chip-on-board light emitting diode (LED) sets, can be on the first surface of the substrate and coupled in series with one another. An ac voltage source input, from outside the solid state lighting apparatus, can be coupled to the first or second surface of the substrate.
-
Citations
78 Claims
-
1. A solid state lighting apparatus comprising:
-
a rectifier circuit mounted on a surface of a substrate housed in the solid state lighting apparatus, coupled to an ac voltage source configured to provide a rectified ac voltage to the substrate; a current source circuit mounted on the surface of the substrate, coupled to the rectifier circuit; a string of light emitting diode (LED) sets, mounted on the surface of the substrate, coupled in series with one another and to the current source circuit; and a plurality of current diversion circuits mounted on the surface of the substrate, respective ones of which are coupled to respective nodes of the string and configured to operate responsive to bias state transitions of respective ones of the LED sets. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
-
-
24. A solid state lighting apparatus comprising:
-
a substrate having first and second opposing surfaces, at least one of which is configured to mount devices thereon; a string of chip-on-board light emitting diode (LED) sets, on the first surface of the substrate, coupled in series with one another; and an ac voltage source input, from outside the solid state lighting apparatus, coupled to the first or second surface of the substrate. - View Dependent Claims (25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36)
-
-
37. A solid state lighting apparatus comprising:
-
a rectifier circuit configured to be coupled to an ac voltage source to provide a rectified ac voltage; a current source circuit coupled to the rectifier circuit; a string of serially-connected LED sets coupled to an output of the current source circuit; at least one capacitor coupled to the output of the current source circuit; a current limiter circuit comprising a current mirror circuit configured to limit a current through at least one of the LED sets to less than a current produced by the current source circuit and to cause the at least one capacitor to be selectively charged via the current source circuit and discharged via the at least one of the LED sets responsive to the rectified ac voltage applied to an input of the current source circuit; a plurality of current diversion circuits coupled to respective nodes between LEDs in the string and configured to be selectively enabled and disabled responsive to bias state transitions of the LED sets as a magnitude of the rectified ac voltage varies; and a substrate having first and second opposing surfaces, wherein at least the string of serially-connected LED sets, the plurality of current diversion circuits, the rectifier circuit, and the current source circuit are mounted on the substrate. - View Dependent Claims (38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49)
-
-
50. A method of forming a solid state lighting circuit, comprising:
-
placing a plurality chip-on-board light emitting diodes (LEDs) in a string configuration on a surface of a substrate; applying an encapsulant material over the plurality of chip-on-board LEDs; and forming the encapsulant material into a layer covering the plurality of chip-on-board LEDs to provide lenses for the plurality of chip-on-board LEDs. - View Dependent Claims (51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64)
-
-
65. A printed circuit board (PCB) comprising:
a substrate, configured for inclusion in a solid state lighting apparatus, the substrate having first and second opposing surfaces, at least one of which is configured to mount a plurality of chip-on-board light emitting diodes (LEDs) thereon, and the substrate configured to couple to an ac voltage source input, from outside the solid state lighting apparatus, and configured for mounting a plurality of discrete current diversion circuits devices thereon coupled to respective nodes between ones of the LEDs and configured to be selectively enabled and disabled responsive to bias state transitions of the LED sets as a magnitude of a rectified ac voltage provided to the LEDs varies. - View Dependent Claims (66, 67, 68, 69, 70)
-
71. A solid state lighting apparatus comprising:
-
a substrate having first and second opposing surfaces, at least one of which is configured to mount devices thereon, the substrate comprising a substrate area; a string of light emitting diode (LED) sets, on the first surface of the substrate, coupled in series with one another, and arranged in an LED portion of the substrate comprising an LED area that is about 40% or less of the substrate area, the string of LED sets configured to emit light comprising about 2000 lumens or more; and an ac voltage source input, from outside the solid state lighting apparatus, coupled to the first or second surface of the substrate.
-
-
72. A solid state lighting apparatus comprising:
-
a substrate having first and second opposing surfaces, at least one of which is configured to mount devices thereon, the substrate comprising a substrate area; a string of light emitting diode (LED) sets, on the first surface of the substrate, coupled in series with one another, and arranged in an LED portion of the substrate comprising an LED area that is about 30% or less of the substrate area, the string of LED sets configured to emit light comprising about 800 lumens or more; and an ac voltage source input, from outside the solid state lighting apparatus, coupled to the first or second surface of the substrate.
-
-
73. A solid state lighting apparatus comprising:
-
a substrate having first and second opposing surfaces, at least one of which is configured to mount devices thereon, the substrate comprising a substrate area; a string of light emitting diode (LED) sets, on the first surface of the substrate, coupled in series with one another, and arranged in an LED portion of the substrate comprising an LED area that is about 38% or less of the substrate area, the string of LED sets configured to emit light comprising about 800 lumens or more; and an ac voltage source input, from outside the solid state lighting apparatus, coupled to the first or second surface of the substrate. - View Dependent Claims (74, 75, 76, 77, 78)
-
Specification