Light control switch circuit

Abstract

The invention discloses a light control switch circuit, which consists of a photoresistor, a thyristor driving circuit, a first thyristor and a filtering circuit, wherein the photoresistor is connected with the thyristor driving circuit and receives the light intensity, whether the thyristor driving circuit outputs driving signals or not is controlled according to the illumination condition, the signal output end of the thyristor driving circuit is connected with a control electrode of the first thyristor, one end of the first thyristor is connected with a live wire of an alternating current power supply, the other end of the first thyristor is connected with one power supply input end of a controlled electric appliance, and the other power supply input end of the controlled electric appliance is connected with a zero wire of the alternating current power supply. The photoresistor is used for receiving the light intensity. In daybreak, the resistance of the photoresistor is very small, the thyristor driving circuit does not work, the first thyristor is stopped, and the controlled electric appliance does not work. After dark, the resistance of the photoresistor is infinitely great,the thyristor driving circuit works and outputs signals to trigger the first thyristor so that the first thyristor is conducted, and the controlled electric appliance works.

Description

technical field [0001] The invention relates to a circuit for controlling whether a controlled electrical appliance (load) works according to light. Background technique [0002] With the change of the world environment, the greenhouse effect is more and more seriously affecting people's lives, and people's awareness of energy saving and emission reduction has begun to increase. Today, saving energy consumption, reducing emissions, and reducing resource waste have become the consensus of people all over the world. However, people still find that sometimes the sky is already very bright, where are the street lights still on! Sometimes, although it is not dark, the street lights are not turned on when lighting is needed due to unclear light! Every day, street lighting is always turned on according to a fixed time! [0003] The reason: most street lighting control systems use time as a switch control mode, timing control. Usually, when the set time is used as the switch con...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem of energy waste in timing control mode to control lighting, the object of the present invention is to provide a circuit for controlling whether the controlled electrical appliances work according to the light

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