Electronic switch based on photosensitive element

Abstract

The invention discloses an electronic switch based on a photosensitive element, and relates to the field of electronic switches, and the electronic switch based on the photosensitive element comprises a step-down rectification filtering module which is used for converting a 220V alternating current into a direct current lower than 22V; a current-limiting protection module which is used for protecting the circuit; a limited voltage supply module which is used for supplying stable voltage to a signal output judgment module as working voltage; an illumination detection module which is used for detecting the intensity of external illumination, wherein the higher the illumination intensity is, the smaller the output voltage is, the lower the illumination intensity is, the higher the output voltage is. Compared with the prior art, the invention has the following beneficial effects: when the illumination intensity is sensed to reach a threshold value, the switch is automatically turned on to supply power to the load and enable the load to work, and meanwhile, the sensing intensity of the illumination signal can be adjusted, so that the magnitude of voltage signals output by the illumination detection module under the same illumination intensity is different; therefore, the illumination intensity is changed when the switch is turned on.

Description

technical field [0001] The invention relates to the field of electronic switches, in particular to an electronic switch based on a photosensitive element. Background technique [0002] An electronic switch refers to an operating unit that uses electronic circuits and power electronic devices to realize circuit switching, including at least one controllable electronic drive device. The photosensitive element will change its physical properties with the intensity of light. When the base of the photosensitive transistor is illuminated, when there is a voltage difference between the collector and the emitter of the photosensitive transistor, the photosensitive transistor will be turned on; , its resistance gradually decreases. [0003] At present, there are many photosensitive switch applications in the market, such as street lamps, which make the street lamps automatically emit light in the evening through the change of the resistance value of the internal photoresistor, but t...

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Problems solved by technology

[0003] At present, there are many photosensitive switch applications in the market, such as street lamps, which make the street lamps automatically emit light in the evening through the change of the resistance value of the internal photoresistor, but the street lamps in this application can only be used when the ambient brightness is lower than the set It emits light when the brightness is fixed, it cannot be adjusted at will, and needs to be improved

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