Automatic dimming table lamp

Abstract

The invention provides an automatic dimming table lamp. The automatic dimming table lamp is composed of a 220V alternating current power supply, a full-bridge rectifying circuit, a 9V voltage stabilizing circuit, a light-sensitive circuit, an optical signal amplification circuit, a bidirectional thyristor trigger circuit and a bidirectional thyristor control circuit, and is characterized in that the type of a unijunction transistor VT2 in the bidirectional thyristor trigger circuit is BT33. According to the automatic dimming table lamp provided by the invention, a light-sensitive resistor is placed in a proper position of a table lamp, and the intensity of illumination around the table lamp can be automatically adjusted to a proper value, thereby reducing the trouble of manual dimming and protecting the eyesight of students. Simultaneously, the automatic dimming table lamp also has a function of stabilizing the light brightness, thus when 220V alternating voltage fluctuates, the brightness of the table lamp is kept unchanged. The brightness of the dimming table lamp can be changed by only changing the distance between the light-sensitive resistor and the bulb of the table lamp, thereby being very convenient to use. The automatic dimming table lamp is suitable for factories to develop a novel table lamp with a function of automatically controlling illumination.

Description

technical field [0001] The invention belongs to the field of electronic technology application and lighting technology, and relates to an automatic dimming desk lamp. Background technique [0002] The dimmable desk lamps commonly used in the market have an obvious shortcoming when reading and studying, namely: 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 bright. Weakness will affect the students' eyesight, and the desk lamp itself cannot automatically adjust the brightness of the light as the brightness of the surrounding environment changes. The invention is an automatic dimming desk lamp, which consists of a photoresistor placed in a proper position of the desk lamp, and the illuminance around the desk lamp can be automatically adjusted to a suitable value, which can reduce the trouble of manual dimming and protect the eyesight of student...

AI Technical Summary

Problems solved by technology

[0002] The dimmable desk lamps commonly used in the market have an obvious shortcoming when reading and studying, namely: 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 bright. Weakness will affect the students' eyesight, and the desk lamp itself cannot automatically adjust the brightness of the light as the brightness of the surrounding environment changes.

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