Desk lamp with automatically regulated brightness

An automatic adjustment and table lamp technology, which is applied in the layout of electric lamp circuits, lighting devices, light sources, etc., can solve the problems of affecting students' eyesight, unable to automatically adjust the brightness of lights, and difficult to control the lamp, so as to protect eyesight, stabilize the brightness of lights, reduce troublesome effect

Inactive Publication Date: 2012-12-26
刘德军
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The dimming desk lamps commonly used in the market have a disadvantage when reading and studying, that is, the brightness of the desk lamp can only be adjusted manually, and it is not easy to control the brightness of the desk lamp, especially for students, the light is too strong or too weak. Students' eyesight, the desk lamp itself cannot automatically adjust the brightness of the light as the brightness of the surrounding environment changes

Method used

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  • Desk lamp with automatically regulated brightness

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Embodiment Construction

[0015] According to attached figure 1 The present invention can be realized by implementing the circuit working principle diagram of the desk lamp with automatic brightness adjustment and the description of the drawings and the technical requirements of the components and parts described below.

[0016] Selection of components and their technical parameters

[0017] Four silicon rectifier diodes of model IN4007 can be selected for the full-bridge rectifier QZ;

[0018] DW is a Zener diode, the selected technical parameters are 9V, 0.5W any type of Zener diode;

[0019] RG is a photoresistor, the selected model is MG45;

[0020] SCR is a bidirectional thyristor, and any model with technical parameters of 1A / 400V can be selected;

[0021] All resistors are 1 / 4W metal film resistors, the resistance value of resistor R1 is 30kΩ, the resistance value of resistor R2 is 2kΩ, and the resistance value of resistor R3 is 100Ω;

[0022] The power of the trimmer potentiometer RP is 0.5...

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Abstract

The invention provides a desk lamp with automatically regulated brightness. The desk lamp with automatically regulated brightness comprises a 220V AC power supply, a full bridge rectifier circuit, a 9V voltage regulator circuit, a light-sensing circuit, an optical signal amplifying circuit, a relaxation oscillation circuit and a double-direction controllable silicon control circuit, and is characterized in that the type selected by a unijunction transistor VT2 in the relaxation oscillation circuit is BT33. The desk lamp with automatically regulated brightness is characterized in that a photoconductive resistor is arranged on a suitable location of the desk lamp, the illuminance surrounding the desk lamp can be automatically regulated to a suitable value, thus the trouble of manual dimming can be reduced and the vision of the students can be protected; moreover, the desk lamp with automatically regulated brightness also has the function of stabilizing the lamp brightness, and the brightness of the desk lamp can be always remained unchanged when a 220V AC voltage fluctuates. The desk lamp has the advantages of simple circuit because normal components are used, and manufacture cost of only more than ten yuan, and is suitable for batch development.

Description

technical field [0001] The invention belongs to the technical field of electronics and lighting, and relates to a table lamp with automatic brightness adjustment. Background technique [0002] The dimming desk lamps commonly used in the market have a disadvantage when reading and studying, that is, the brightness of the desk lamp can only be adjusted manually, and it is not easy to control the brightness of the desk lamp, especially for students, the light is too strong or too weak. Students' eyesight, the desk lamp itself cannot automatically adjust the brightness of the light as the brightness of the surrounding environment changes. The present invention is a desk lamp with automatic brightness adjustment, which is placed in a proper position of the desk lamp by a photoresistor, and the illuminance around the desk lamp can be automatically adjusted to a suitable value, which can not only reduce the trouble of manual dimming, but also protect the eyesight of students . In...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B37/02
Inventor 刘德军
Owner 刘德军
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