# US 2013/0278138 A1 · Light-emitting apparatus and lighting appliance provided with the same

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- Number: US 2013/0278138 A1
- Document ID: US20130278138A1
- Status: Published application
- Kind: A1
- Application number: 13/703,717
- Filed: 2011-06-16
- Published: 2013-10-24
- Earliest claimed: 2010-06-18
- Assignees: Koninklijke Philips Electronics N.V.
- Inventors: Takaaki Yagi
- Web page: https://patentgrep.com/patent/US20130278138A1

## CPC

- H05B 45/40: Details of LED load circuits
- H05B 45/54: in a series array of LEDs
- H05B 45/37: Converter circuits
- Y02B 20/30: Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
- H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- Y02B: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS

## Abstract

A light-emitting apparatus including a substrate, an LED string mounted on the substrate, the LED string in which a plurality of light-emitting diodes D1-D6 are connected in series, a power supply line 13 (13a, 13b) connected in series to the LED string, and a plurality of protection capacitors C (C1-C5), each being arranged between a connection N (N1-N5) between at least one set of light-emitting diodes in the LED string and the power supply line 13 and having an impedance smaller than an impedance between the connection N and an earth.

## Claims

### Claim 1

A light-emitting apparatus, comprising:
a substrate;
an LED string mounted on the substrate, in which LED string a plurality of LEDs are connected in series;
a power supply path connected in series to the LED string; and
a protection element arranged between a connection between at least one set of LEDs in the LED string and the power supply path, wherein the impedance of said protection element is smaller than an impedance between the connection and an case ground.

### Claim 2 (depends on 1)

The light-emitting apparatus according to claim 1, wherein the protection element is arranged between each of the connections adjacent to the LEDs that are located at the ends of the LED string and the power supply path.

### Claim 3 (depends on 1)

The light-emitting apparatus according to claim 1, wherein the light-emitting apparatus is arranged between each of the connections between the LEDs in the LED string and the power supply path.

### Claim 4 (depends on 1)

The light-emitting apparatus according to claim 1, wherein the protection element is a capacitor.

### Claim 5

(canceled)

### Claim 6 (depends on 1)

A lighting appliance, comprising:
the light-emitting apparatus according to claim 1; and
a housing to which the substrate is attached, wherein the LEDs are lit by the application of a voltage.

### Claim 7

A light-emitting apparatus, comprising:
a substrate;
an LED string mounted on the substrate, in which LED string a plurality of LEDs are connected in series;
a power supply path connected in series to the LED string; and
a protection element arranged between a connection between at least one set of LEDs in the LED string and the power supply path, wherein the impedance of said protection element is smaller than an impedance between the connection and an case ground,
wherein the power supply path is at least any one of a power supply path on an anode side of the LED string and a power supply path on a cathode side of the LED string.

### Claim 8 (depends on 7)

The light-emitting apparatus according to claim 7, wherein the protection element is arranged between each of the connections adjacent to the LEDs that are located at the ends of the LED string and the power supply path.

### Claim 9 (depends on 7)

The light-emitting apparatus according to claim 7, wherein the light-emitting apparatus is arranged between each of the connections between the LEDs in the LED string and the power supply path.