Desk lamp with automatically regulated brightness

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...

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

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