LED lamp color temperature and brightness linear control circuit

Abstract

The invention relates to an LED lamp color temperature and brightness linear control circuit. The circuit comprises a DC power supply unit, an LED lamp unit with two different color temperatures, a brightness control unit which is used for receiving a first signal and outputting a brightness control signal to the positive electrode of the LED lamp unit so as to adjust the brightness of the LED lamp unit, and a linear color temperature control unit which is used for receiving a second signal and respectively outputting linear color temperature control signals to the negative electrodes of different paths of LED lamps in the LED lamp unit, wherein the second signal enables the linear color temperature control signal to generate corresponding linear change in a linear change mode to change the current proportions of the negative electrodes of the different paths of LED lamps, so that the LED lamp unit realizes linear change from one color temperature to another color temperature. The circuits of the brightness control unit and the linear color temperature control unit are combined together and connected to the positive electrodes and the negative electrodes of the LED lamps respectively, linear changes of brightness and color temperature are adjusted through two paths of independent signals respectively, and the user experience is improved.

Description

technical field [0001] The invention relates to an LED lamp control circuit, in particular to a linear control circuit for color temperature and brightness of an LED lamp. Background technique [0002] LED lighting is one of the necessities of modern life. At present, LED lighting is mainly divided into two parts, one is commercial lighting and the other is civil lighting; commercial lighting is mainly used for indoor decorative lighting, indoor general lighting, outdoor advertising sign lighting and others. Lighting covers almost all industries. Most of the LED lamps are used in the direct lighting type, and the brightness cannot be adjusted. When the ambient brightness is high, the brightness cannot be lowered, which is easy to cause waste; It is also a direct lighting type, one color of light is lit at a time, and the two colors are switched to each other. It is the simplest application of two-color temperature lamps, and there is no linear change of the two color tempera...

AI Technical Summary

Problems solved by technology

[0004] 1. Simple lighting, only control the on and off of the LED light, and directly provide positive voltage to the positive and negative poles of the light to light up the lamp beads; this method is the most basic, the cost is the lowest, and it only needs to be controlled by a switch. The impact is that long-term lighting is likely to cause energy waste

[0005] 2. Simply control the brightness of LED lamps; in some occasions, you will see that some lamps can be controlled by controlling the brightness of the lamps. This is by directly changing the voltage at both ends of the lamp to adjust the brightness of the lamps. effect, but LED lamps generate a lot of heat during use, and adjusting the voltage is not the most suitable way. LED lamps are suitable for current adjustment of brightness

[0006] 3. Simply adjust the color temperature, you can only control a certain color temperature in the lamp, that is, a separate cool white light or a separate warm white light; some LED lamps contain two colors of lamp beads, generally a cool white lamp bead and a A kind of warm white lamp bead can display one color temperature by directly supplying power to a certain lamp bead, and two color temperatures can be displayed by switching the switch. This simple switch can achieve the effect of two color temperatures, but it needs Increase the number of switches, and the production cost is high; some manufacturers simply add the above two aspects together and control them separately, directly high brightness or low brightness, low color temperature or high color temperature, although these control methods have certain effects , but the cost is high, the on-site construction is troublesome, the product is not an organic whole, and the color temperature and brightness of this LED lamp change abruptly, which makes the user experience poor

[0007] Therefore, for the color temperature and voltage control circuit of LED lamps, if the color temperature and brightness of LED lamps need to be controlled to change linearly within a certain range, there is still no good solution.

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