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Lighting equipment

A technology for lighting devices and light-emitting diodes, applied in lighting devices, electric lamp circuit layout, electroluminescent light sources, etc., can solve the problems of wasting energy, unable to adjust light, and unable to correct deviations

Inactive Publication Date: 2012-05-23
SHARP KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In conventional lighting devices using light-emitting diodes that change the resistance value to change the current value, energy is wasted (heat) due to resistance
[0006] In addition, the level of dimming is determined by the number of resistors installed, and dimming cannot be freely performed
[0007] In addition, deviations in brightness (illuminance, luminosity) cannot be corrected

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] figure 1 It is a block diagram showing the configuration of main parts of Embodiment 1 of the lighting device of the present invention.

[0049] The lighting device includes: a rectifier circuit 1, which rectifies AC power (AC input); a switch circuit 2, which switches the DC power rectified by the rectifier circuit 1; a transformer 3, which switches the voltage of the power after the switch circuit 2 switches. and a diode 4 to rectify the secondary current of the transformer 3.

[0050]In addition, the lighting device also includes: a smoothing filter capacitor C to smooth the DC current rectified by the diode 4; The DC current of the sixth light-emitting diode LED is connected to the ground terminal (fixed potential terminal).

[0051] In addition, this illuminating device also comprises: illuminance sensor (sensor) 7, is arranged in the vicinity of six light-emitting diodes LED; It is connected with the illuminance sensor 7 and the light receiving part 8 of the re...

Embodiment 2

[0068] Figure 6 It is a block diagram showing the configuration of main parts of Embodiment 2 of the lighting device of the present invention.

[0069] This lighting device includes: a remote controller light receiving unit 8 that receives an operation signal light from a remote controller not shown; and a control unit 6 connected to the remote controller light receiving unit 8 . In addition, the lighting device also includes a voltage divider circuit 10, which connects the series circuit of resistors R7, R8 and the series circuit of resistors R9, R10, R11, R12 in parallel, and has: NPN transistor Tr3 for The resistors R11 and R12 are bypassed; and the NPN transistor Tr2 is used to bypass the resistor R12 so as to divide the constant voltage (predetermined voltage) of the control power supply 5 respectively.

[0070] The resistor Rsc for current detection is set on the grounding line between the resistors R8 and R12, and the connection point of the resistor R8 and the resist...

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PUM

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Abstract

Lighting equipment is provided which uses light emitting diodes that can be light-modulated by using a simple structure to vary a current flowing through the light emitting diodes. In the lighting equipment: a current is supplied from a DC power supply (2, 3, 4, C) to the light emitting diodes (LED); the current flowing through the light emitting diodes (LED) is detected; and the DC power supply (2, 3, 4, C) is on / off-controlled based on the detected current, thereby controlling the current flowing through the light emitting diodes. The lighting equipment comprises: a resistor (Rsc) connected between the DC power supply (2, 3, 4, C) and a fixed potential terminal; a voltage divider circuit (9) for dividing a given voltage; a PWM control circuit (6, FET) for controlling the variation of the voltage division ratio of the voltage divider circuit (9) by means of a PWM control using a duty ratio that is in accordance with an operation of setting the brightness; an FET; and a comparator circuit (COMP) for comparing a voltage related to the voltage across the resistor (Rsc) with an output voltage of the voltage divider circuit (9). The DC power supply (2, 3, 4, C) is on / off-controlled in accordance with a result of the comparison of the comparator circuit (COMP).

Description

technical field [0001] The present invention relates to a lighting device for dimming by changing the current value supplied to a light-emitting diode, and particularly relates to a method for controlling the current value. Background technique [0002] Since the light-emitting diode (LED) has high luminous efficiency, can be used at low voltage, and has a high energy-saving effect, since the development of white light-emitting diodes, it has been used not only as a light source (backlight) for liquid crystal display devices, but also recently. For general lighting installations. When used in these devices, since the output of a plurality of light-emitting diodes alone is small, a plurality of light-emitting diodes are usually arranged in a matrix and connected in series so that the same current flows through the plurality of light-emitting diodes, thereby , can prevent uneven light emission. [0003] Patent Document 1 discloses an LED driving circuit, which includes: an L...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B37/02H01L33/00
CPCH05B33/0818H05B33/0851H05B45/382H05B45/12
Inventor 宇原裕人
Owner SHARP KK