# US 8,569,970 B2 · LED with integrated constant current driver

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- Number: US 8,569,970 B2
- Document ID: US8569970B2
- Status: Granted
- Kind: B2
- Application number: 13/532,451
- Filed: 2012-06-25
- Published: 2012-10-18
- Granted: 2013-10-29
- Earliest claimed: 2007-07-17
- Assignees: Cree, Inc.
- Applicants: Robert Underwood; Yifeng Wu
- Inventors: Robert Underwood; Yifeng Wu
- Web page: https://patentgrep.com/patent/US8569970B2

## CPC

- H05B 45/40: Details of LED load circuits
- H05B 45/375: using buck topology
- H05B 45/395: Linear regulators
- H05B 45/38: using boost topology
- H10W 90/753: {between laterally-adjacent chips}
- Y02B 20/30: Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
- Y10S 362/80: Light emitting diode
- H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H10W: GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10
- Y02B: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS

## Abstract

An LED package containing integrated circuitry for matching a power source voltage to the LED operating voltage, LEDs containing such integrated circuitry, systems containing such packages, and methods for matching the source and operating voltages are described. The integrated circuitry typically contains a power converter and a constant current circuit. The LED package may also contain other active or passive components such as pin-outs for integrated or external components, a transformer and rectifier, or a rectifier circuit. External components can include control systems for regulating the LED current level or the properties of light emitted by the LED. Integrating the power supply and current control components into the LED can provide for fabrication of relatively small LEDs using fewer and less device-specific components.

## Claims

### Claim 1

A light emitting device package comprising:
at least one LED in said package; and
circuitry comprising a current converter integrated into said package;
wherein the circuitry provides at least one operating voltage to the LED.

### Claim 2 (depends on 1)

The package of claim 1, wherein the current converter comprises an AC-DC converter.

### Claim 3 (depends on 1)

The package of claim 1, wherein the current converter comprises at least one rectifier.

### Claim 4 (depends on 3)

The package of claim 3, wherein the at least one rectifier comprises a full-wave rectifier.

### Claim 5 (depends on 3)

The package of claim 3, wherein the at least one rectifier comprises at least one semiconductor device.

### Claim 6 (depends on 5)

The package of claim 5, wherein the at least one semiconductor device comprises silicon.

### Claim 7 (depends on 1)

The package of claim 1, wherein the current converter comprises an inverter.

### Claim 8 (depends on 1)

The package of claim 1, wherein the current converter comprises an oscillator.

### Claim 9 (depends on 1)

The package of claim 1, further comprising at least one voltage level converter.

### Claim 10 (depends on 1)

The package of claim 1, further comprising at least one constant current circuit.

### Claim 11 (depends on 1)

The package of claim 1, further comprising at least one transformer.

### Claim 12 (depends on 1)

The package of claim 1, wherein the circuitry comprises drive circuitry.

### Claim 13 (depends on 1)

A light emitting system comprising the package of claim 1.

### Claim 14 (depends on 9)

The package of claim 9, wherein the at least one voltage converter is selected from the group consisting of a DC voltage converter, a charge pump, a switched-mode power supply, and combinations thereof.

### Claim 15 (depends on 1)

The package of claim 1, further comprising at least one first electrical connector.

### Claim 16 (depends on 15)

The package of claim 15, wherein the at least one first connector provides an electrical connection to at least one power source.

### Claim 17 (depends on 15)

The package of claim 15, wherein the at least one first connector provides an electrical connection to at least one control system.

### Claim 18 (depends on 17)

The package of claim 17, wherein, the at least one control system provides control over at least one LED current.

### Claim 19 (depends on 17)

The package of claim 17, wherein the at least one control system provides control over at least one property of light emitted by the LED.

### Claim 20 (depends on 1)

A packaged LED comprising the device package of claim 1.

### Claim 21 (depends on 13)

The system of claim 13, wherein the control system is connected to the package and provides control over at least one property of light emitted by the LED.

### Claim 22 (depends on 13)

The system of claim 13, further comprising at least one power source.

### Claim 23 (depends on 13)

The system of claim 13, further comprising at least one control system.