LED power-source circuit and illumination fixture using the same
First Claim
Patent Images
1. An LED power circuit comprising:
- an input filter circuit including at least a noise prevention capacitor and a line filter;
a diode bridge having an input side electrically coupled to the input filter circuit and having an output side;
a smoothing capacitor electrically coupled to the output side of the diode bridge and having a capacitance of 1 μ
F or less;
a DC-DC conversion circuit electrically coupled across the smoothing capacitor and having an output side;
an LED assembly connected to the output side of the DC-DC conversion circuit;
a grounding capacitance circuit is coupled to ground from an input power-source line between the line filter and the diode bridge, said grounding capacitance circuit comprising first and second grounding capacitors coupled in series between the input power-source line and a circuit ground, and a third grounding capacitor coupled on a first end to a node between the first and second grounding capacitors and coupled on a second end to earth ground; and
wherein a total combined capacitance of the first, second and third grounding capacitors is substantially 1/200 or less of that of a capacitance of the smoothing capacitor.
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Accused Products
Abstract
An LED power-source circuit includes an input filter circuit including noise prevention capacitors and a line filter, a diode bridge connected to the input filter circuit, a smoothing capacitor connected to an output of the diode bridge and having a capacitance of 1 μF or less, a DC-DC conversion circuit connected to the smoothing capacitor, and an LED assembly connected to an output of the DC-DC conversion circuit. Grounding capacitors are coupled to ground from an input power line between the line filter and the diode bridge. The total capacitance from the input power line to ground is set to be 1/200 or less of that of the smoothing capacitor.
9 Citations
6 Claims
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1. An LED power circuit comprising:
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an input filter circuit including at least a noise prevention capacitor and a line filter; a diode bridge having an input side electrically coupled to the input filter circuit and having an output side; a smoothing capacitor electrically coupled to the output side of the diode bridge and having a capacitance of 1 μ
F or less;a DC-DC conversion circuit electrically coupled across the smoothing capacitor and having an output side; an LED assembly connected to the output side of the DC-DC conversion circuit; a grounding capacitance circuit is coupled to ground from an input power-source line between the line filter and the diode bridge, said grounding capacitance circuit comprising first and second grounding capacitors coupled in series between the input power-source line and a circuit ground, and a third grounding capacitor coupled on a first end to a node between the first and second grounding capacitors and coupled on a second end to earth ground; and wherein a total combined capacitance of the first, second and third grounding capacitors is substantially 1/200 or less of that of a capacitance of the smoothing capacitor. - View Dependent Claims (2, 3)
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4. A lamp fixture comprising:
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a lamp housing; an LED power circuit positioned in the lamp housing; an LED assembly connected to the lamp housing and electrically coupled to the LED power circuit; the LED power circuit comprising an input filter circuit including at least a noise prevention capacitor and a line filter, a diode bridge having an input side electrically coupled to the input filter circuit and having an output side, a smoothing capacitor electrically coupled to the output side of the diode bridge and having a capacitance of 1 μ
F or less,a DC-DC conversion circuit electrically coupled across the smoothing capacitor and having an output side; the LED assembly connected to the output side of the DC-DC conversion circuit; a grounding capacitance circuit is coupled to ground from an input power-source line between the line filter and the diode bridge, said grounding capacitance circuit comprising first and second grounding capacitors coupled in series between the input power-source line and a circuit ground, and a third grounding capacitor coupled on a first end to a node between the first and second grounding capacitors and coupled on a second end to a fixture ground, wherein a total capacitance of the grounding capacitor from the power-source line to fixture ground is substantially 1/200 or less of that of a capacitance of the smoothing capacitor. - View Dependent Claims (5, 6)
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Specification
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Current AssigneePanasonic Corporation (Panasonic Holdings Corporation)
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Original AssigneePanasonic Corporation (Panasonic Holdings Corporation)
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InventorsKumada, Kazuhiro, Kuroki, Yoshifumi, Mizukawa, Hiromitsu
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Primary Examiner(s)Le, Tung X
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Application NumberUS12/697,187Publication NumberTime in Patent Office1,131 DaysField of Search315/224, 315/247, 315/291, 315/294, 315/297US Class Current315/291CPC Class CodesH05B 45/3725 Switched mode power supply ...H05B 45/375 using buck topologyH05B 45/385 using flyback topologyY02B 20/30 Semiconductor lamps, e.g. s...
