Light control circuit for light-operated LED lamp and light-operated LED lamp circuit

Abstract

The invention discloses a light control circuit for a light-operated LED lamp and a light-operated LED lamp circuit. Thelight control circuit is characterized in that the light control circuit periodically detects light intensity when outputting a light-out signal, if the detected light intensity is greater than or equal to a second light intensity threshold value, the control end of the light control circuit outputs the light-out signal, if the detected light intensity is less than the second light intensity threshold value, the control end of the light control circuit outputs a light-on signal, after a signal output by the control end of the light control circuit is changed from the light-out signal to the light-on signal, in the process that the sunlight intensity is gradually reduced, the light control circuit judges whether the sunlight intensity reaches the minimum or not by judging whether the light intensity is stable or not, then the light intensity of light emitted by a light-operated LED lamp stably is measured, and every time the light intensity is detected subsequently, a corresponding light-on signal or light-out signal is output by calculating the difference between the detected light intensity and the light intensity of the light. According to the invention, the sunlight intensity can be accurately judged, the sensitivity of the light-operated LED lamp which continuously emits light is high when the light-operated LED lamp is switched from the light-on state to the light-outstate, and the light flashing phenomenon is avoided.

Description

technical field [0001] The invention relates to a light control circuit for light control LED lamps, in particular to a light control circuit for light control LED lights and a light control LED light circuit. Background technique [0002] In a diurnal change in daylight intensity, the daylight intensity goes from maximum to minimum and then increases from minimum to maximum. Light-controlled LED lamps can automatically turn on the lights at night according to the changes in the intensity of sunlight, and can automatically turn off the lights during the day, which is convenient and practical, and has been widely used. The light-controlled LED light has two working states, that is, the light-on state and the light-off state, and a first light intensity threshold and a second light intensity threshold are set in it. The first light intensity threshold is greater than or equal to the second light intensity threshold, and the light control LED The lights are turned off during t...

AI Technical Summary

Problems solved by technology

[0004] There are two main types of existing light-controlled LED lamps: the first type of light-controlled LED lamps will periodically appear when the naked eye cannot feel the light-emitting time when the light-controlled LED light is on. During this time, the light control circuit detects Light intensity, the light intensity detected at this time is the intensity of sunlight, which can avoid light interference, so this type of light-controlled LED light has the advantage of high control accuracy when the light is on or off, but because it has periodicity in the light-on state When there is no light, there will be a high stroboscopic flicker when the light is on; the second type of light-controlled LED lights will keep emitting continuously when the light is on, and there will be no stroboscopic flicker. It uses the sunlight spectrum and the light spectrum of the LED light Different principles are used to detect the intensity of sunlight, because most of the light spectrum of LED lights is in the visible light spectrum, and the sunlight spectrum contains not only the visible light spectrum, but also rich near-infrared light spectrum components, so this kind of light-controlled LED lights set The light receiver filters visible light, and through a specially designed installation method to reduce the light emitted by the light-controlled LED light to the light receiver, minimizing the impact of the light of the light-controlled LED light on the detection results of sunlight intensity, but this The intensity of sunlight detected by light-controlled LED lights is still more or less affected by the light of the light-controlled LED lights, so this type of light-controlled LED lights still cannot measure the accurate sunlight intensity when the light is on. The sensitivity of the transition from the light state to the light-off state is low, and it may also be because the installation method does not meet the requirements, and the light emitted by itself is reflected on the light receiver to affect the light intensity detection result, resulting in flickering

Images