Light-emitting device and illumination apparatus
First Claim
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1. A light-emitting device comprising:
- a plurality of semiconductor light-emitting diodes connected in series with each other and mounted on a printed board;
a plurality of first bypass capacitors mounted on the printed board, one connected in parallel to each of the semiconductor light-emitting diodes, respectively; and
at least one second bypass capacitor mounted on the printed board and connected in parallel to a group of said first bypass capacitors in such a manner as to reduce the AC impedance at desired connection points of said plurality of the semiconductor light-emitting diodes against the grounding point of said plurality of the semiconductor light-emitting diodes.
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Abstract
A light-emitting device and an illumination apparatus are disclosed. A plurality of LED elements are connected in series between positive and negative lines, and first bypass capacitor is connected in parallel to the LED elements respectively. Each series circuit of a predetermined number of LED elements is connected in parallel to second bypass capacitors. As a result, with the negative power line set as a grounding point, the AC impedance at connection points of the series circuit of the LED elements against the ground is reduced. Thus, the erroneous lighting or “flicker” of each LED which otherwise might be caused by an external noise is prevented.
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Citations
8 Claims
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1. A light-emitting device comprising:
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a plurality of semiconductor light-emitting diodes connected in series with each other and mounted on a printed board; a plurality of first bypass capacitors mounted on the printed board, one connected in parallel to each of the semiconductor light-emitting diodes, respectively; and at least one second bypass capacitor mounted on the printed board and connected in parallel to a group of said first bypass capacitors in such a manner as to reduce the AC impedance at desired connection points of said plurality of the semiconductor light-emitting diodes against the grounding point of said plurality of the semiconductor light-emitting diodes. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A light-emitting device comprising:
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a plurality of semiconductor light-emitting diodes connected in series with each other and mounted on a printed board; and a plurality of first bypass capacitors mounted on the printed board, one connected in parallel to each of the semiconductor light-emitting diodes, respectively, in such a manner as to reduce the AC impedance at desired connection points of said plurality of the semiconductor light-emitting diodes against the grounding point of said plurality of the semiconductor light-emitting diodes. - View Dependent Claims (8)
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Specification