LIGHTING DEVICE
First Claim
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1. A lighting device comprising:
- a device board;
a rectification device connected to a commercial power supply;
a series LED circuit mounted on the device board and configured by connecting in series a plurality of LED elements; and
a current limiter which is connected in series with the series LED circuit and limits a maximum current flowing through the series LED circuit, whereinan output of the rectification device is applied to a series circuit constituted by the series LED circuit and the current limiter, thereby to light each of the plurality of LED elements, anda number of the plurality of LED elements is set in a manner that a voltage applied to the series LED circuit is 70 to 90% of an output voltage of the rectification device.
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Abstract
According to one embodiment, a lighting device includes a device board, a rectification device connected to a commercial power supply, a series LED circuit, and a transistor (current limiter) which limits a maximum current flowing through the series LED circuit. The series circuit mounted on the device board is configured by connecting in series a plurality of LED elements. Each of the LED elements lights when an output voltage of the rectification device is applied to the series circuit. A number of LED elements included in the series circuit is set in a manner that a voltage applied to the series LED circuit is 70 to 90% of the output voltage of the rectification device.
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Citations
11 Claims
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1. A lighting device comprising:
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a device board; a rectification device connected to a commercial power supply; a series LED circuit mounted on the device board and configured by connecting in series a plurality of LED elements; and a current limiter which is connected in series with the series LED circuit and limits a maximum current flowing through the series LED circuit, wherein an output of the rectification device is applied to a series circuit constituted by the series LED circuit and the current limiter, thereby to light each of the plurality of LED elements, and a number of the plurality of LED elements is set in a manner that a voltage applied to the series LED circuit is 70 to 90% of an output voltage of the rectification device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A lighting device comprising:
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a device board; a rectification device connected to a commercial power supply; a series LED circuit mounted on the device board and configured by connecting in series a plurality of LED elements; and a current limiter which is connected in series with the series LED circuit and limits a maximum current flowing through the series LED circuit, wherein an output of the rectification device is applied to a series circuit constituted by the series LED circuit and the current limiter, thereby to light each of the plurality of LED elements, and a number of the plurality of LED elements is set in a manner that a forward LED element voltage applied to the series LED circuit is 70 to 90% of a rated input voltage of the commercial power supply.
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Specification