A light control circuit

Abstract

The invention relates to an optical control circuit, comprising a photosensitive transistor connected in sequence, a voltage window comparator and a feedback amplifier, the photosensitive transistor is used to receive an optical signal, convert the optical signal into an electrical signal and send it to the voltage window comparator; The voltage window comparator is used to compare the voltage of the electrical signal with the reference voltage, and send the compared signal to the main control MCU to adjust the LED light source; the feedback amplifier is used to amplify the signal output by the voltage window comparator , and the amplified signal is fed back to the input of the voltage window comparator. The light control circuit of the present invention uses discrete components, has a simple structure and low cost, and the feedback amplifier locks the signal in time, so that the light source will not flicker or switch back and forth multiple times during the critical state of day and night.

Description

technical field [0001] The invention relates to the technical field of LED lighting, in particular to a light control circuit. Background technique [0002] The current outdoor lighting and lighting in public places require the function of turning off the lights during the day and turning on the lights at night. Most lamps cannot be completed automatically, and need to be manually switched or controlled by a computer system; the light control circuit on the market is in a critical state between day and night. Sometimes there will be unstable states such as flickering or multiple back and forth transitions, and the failure rate is high. Contents of the invention [0003] In order to overcome the deficiencies of the prior art, the object of the present invention is to provide a light control circuit with reliable performance. [0004] The technical solution adopted by the present invention to solve its technical problems is: [0005] A light control circuit, comprising a p...

AI Technical Summary

Problems solved by technology

[0002] The current outdoor lighting and lighting in public places require the function of turning off the lights during the day and turning on the lights at night. Most lamps cannot be completed automatically, and need to be manually switched or controlled by a computer system; the light control circuit on the market is in a critical state between day and night. There will be unstable states such as flickering or multiple back and forth transitions, and the failure rate is high

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