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 capacitor is coupled to ground from an input power-source line between the line filter and the diode bridge; and
wherein a total capacitance from the power-source line to ground 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.
16 Citations
5 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 capacitor is coupled to ground from an input power-source line between the line filter and the diode bridge; and wherein a total capacitance from the power-source line to ground is substantially 1/200 or less of that of a capacitance of the smoothing capacitor. - View Dependent Claims (3, 4)
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2. An LED power circuit comprising:
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an input filter circuit comprising a noise prevention capacitor and a line filter; a diode bridge connected to the input filter circuit; a smoothing capacitor connected to f the diode bridge and having a capacitance of 1 μ
F or less;a DC-DC conversion circuit connected to the smoothing capacitor; an LED assembly connected to the DC-DC conversion circuit; a grounding capacitor is coupled to ground from a circuit ground on a direct-current output side of the diode bridge; and wherein a total capacitance from the circuit ground to the ground is set to be 1/200 or less of that of the smoothing capacitor.
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5. 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 capacitor coupled to ground from an input power-source line between the line filter and the diode bridge; and wherein a total capacitance from the power-source line to ground is substantially 1/200 or less of that of a capacitance of the smoothing capacitor.
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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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InventorsMizukawa, Hiromitsu, Kumada, Kazuhiro, Kuroki, Yoshifumi
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Granted Patent
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Time in Patent OfficeDays
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Field of Search
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US Class Current315/291
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CPC 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...
