Light-emitting apparatus and lighting appliance provided with the same
AssigneeKoninklijke Philips N.V.
InventorTakaaki Yagi
Life of this patent
Estimating the term…
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 case ground.
Claims20
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 first power supply node connected to an end of the LED string;
- and
- a plurality of protection elements, each protection element having a first node commonly connected to the first power supply node and a second node connected between a pair of the LEDs in the series, each pair of the LEDs being different from each other, wherein an AC impedance of the protection elements is smaller than an impedance between the pairs of LEDs and a case ground, wherein the protection elements include capacitors or zener diodes.
A lighting appliance, comprising:
- a substrate;
- a housing to which the substrate is attached;
- an LED string mounted on the substrate, in which LED string a plurality of LEDs are connected in series;
- a first power supply node connected to an end of the LED string;
- a plurality of protection elements, each protection element having a first node commonly connected to the first power supply node and a second node connected between a pair of the LEDs in the series, each pair of the LEDs being different from each other,
- wherein an AC impedance of the protection elements is smaller than an impedance between the pairs of LEDs and a case ground, wherein the protection elements include capacitors or zener diodes.
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 first power supply node connected to one of:
- an anode side of the LED string, and a cathode side of the LED string;
- and
- a plurality of protection elements, each protection element having a first node commonly connected to the first power supply node and a second node connected between a pair of the LEDs in the series, each pair of the LEDs being different from each other,
- wherein an impedance of each protection element is smaller than an impedance between the pairs of LEDs and an case ground, wherein the protection elements include capacitors or zener diodes.
Dependencies are inferred from the claim text.