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Lighting devices and lighting devices

A technology for a light-emitting device and a light-emitting portion, which is applied to lighting devices, electroluminescent light sources, light sources, etc., can solve problems such as increased cost and complicated circuit structure, and achieve the effect of simple structure.

Active Publication Date: 2021-06-01
SHARP KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, a step-down chopper circuit is required for each LED unit, which complicates the circuit configuration and increases the cost

Method used

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  • Lighting devices and lighting devices
  • Lighting devices and lighting devices
  • Lighting devices and lighting devices

Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0045] figure 1 It is a figure which shows an example of the illuminating device of this invention. Such as figure 1 As shown, the lighting device A has a current source Pi and a light emitting device Op. The light emitting device Op includes a first light emitting part 1 and a second light emitting part 2, and the first light emitting part 1 and the second light emitting part 2 are connected in parallel with a current source Pi.

[0046] The current source Pi is a power source capable of supplying a direct current to a connected circuit. The current source Pi is configured to be able to change the value of the current to be passed, and to continuously supply a current of an arbitrary current value. The current source Pi has a configuration capable of applying a voltage to a connected circuit, similarly to a normal power supply. The current source Pi includes a positive pole Pi1 and a negative pole Pi2. In the lighting device A of the present invention, the negative elect...

no. 2 approach

[0104] Another example of the lighting device of the present invention will be described with reference to the drawings. Figure 7 It is a figure which shows another example of the illuminating device of this invention. Figure 7 The illustrated lighting device B has the same configuration as the lighting device A except that the first light emitting unit 1b is different. Therefore, the same reference numerals are assigned to the same parts of the lighting device B as those of the lighting device A, and detailed description of the same parts will be omitted.

[0105] The relationship of Vf1>Vf2 exists between the forward voltage Vf1 of LED11 used for lighting apparatus A, and the forward voltage Vf2 of LED21. Therefore, the total forward voltage SVf1 of the first LED group 10 in which five LEDs 11 are connected in series is larger than the total forward voltage SVf2 of the second LED group 20 in which five LEDs 21 are connected in series.

[0106] On the other hand, the forw...

no. 3 approach

[0111] Still another example of the lighting device of the present invention will be described with reference to the drawings. Figure 8 It is a figure which shows another example of the illuminating device of this invention. for Figure 8 In the illustrated lighting device C, three first LED groups 10 c in which a plurality of (here, five) LEDs 11 are connected in series are connected in parallel in the first light emitting unit 1 c. Moreover, the 2nd light emitting part 2c connects in parallel the five 2nd LED groups 20c which connected several (here, three) LED21 in series. The other parts are the same as the lighting device A of the first embodiment. Therefore, in the configuration of the lighting device C, the parts that are substantially the same as those of the lighting device A are denoted by the same reference numerals, and detailed description of the same parts will be omitted.

[0112]LEDs generate current by forwardly applying a voltage higher than a predetermi...

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Abstract

The present invention provides an illuminating device that uses a light emitting diode as a light source and can switch the light emitting color and adjust the light of each light emitting color. Therefore, there are multiple light emitting parts equipped with at least one light emitting diode. The light emitting parts other than the light emitting part are provided with switching elements connected in series with the light emitting diodes, and the light emitting parts other than the light emitting part with the smallest forward voltage are provided with elements having resistances connected in series with the light emitting diodes.

Description

technical field [0001] The present invention relates to a light-emitting device including a light-emitting element such as a light-emitting diode (LED), and a lighting device using the light-emitting device. Background technique [0002] In recent years, LEDs (Light Emitted Diodes) with low power consumption and long life have attracted attention, and lighting devices using LEDs as light sources are increasingly used instead of conventional lighting devices using incandescent lamps as light sources. Among lighting devices using LEDs as light sources, there have been proposed lighting devices capable of dimming by changing light beams and toning by changing emitted light colors (for example, refer to Patent Documents 1 to 4, etc.). [0003] In the lighting device of Patent Document 1, a current is supplied from a power supply unit to a plurality of light sources (white light, lamp color light) that emit light of different colors. The power supply unit is connected in paralle...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L25/075H05B45/28H05B45/20H05B44/00
CPCH01L33/54H01L33/62H01L25/0753H05B47/10H05B45/28H05B45/46
Inventor 小野刚史
Owner SHARP KK