CN214205894U

CN214205894U - LED self-adaptive dimming circuit

Info

Publication number: CN214205894U
Application number: CN202023309683.9U
Authority: CN
Inventors: 王洪波
Original assignee: Xiamen Maineng Technology Co ltd
Current assignee: Xiamen Maineng Technology Co ltd
Priority date: 2020-12-31
Filing date: 2020-12-31
Publication date: 2021-09-14
Anticipated expiration: 2030-12-31

Abstract

The utility model relates to a LED self-adaptive dimming circuit, which comprises a light sensor, a controller, a clock circuit, an LED drive IC, a power circuit, a white LED lamp group and a yellow LED lamp group; the brightness of ambient light is collected through a light sensor, so that the brightness of a white LED lamp group and the brightness of a yellow LED lamp group are controlled through a PWM signal of a controller and an LED drive IC, and self-adaptive dimming is realized; meanwhile, the clock signal provided by the clock circuit is synchronous with the external time, so that the brightness of the yellow LED lamp group is improved by the controller at night, the brightness of the white LED lamp group is reduced, the light emitted by the white LED lamp group and the light emitted by the yellow LED lamp group are softer, and eyes are protected.

Description

LED self-adaptive dimming circuit

Technical Field

The utility model relates to a LED lighting technology field specifically is a LED self-adaptation light-emitting circuit.

Background

Light emitting diodes are referred to as LEDs for short. Is made of a compound containing gallium (Ga), arsenic (As), phosphorus (P), nitrogen (N), etc.

When electrons and holes are recombined, visible light is radiated, so that the light-emitting diode can be manufactured. In circuits and instruments as indicator lights or to form text or numerical displays. Gallium arsenide diodes emit red light, gallium phosphide diodes emit green light, silicon carbide diodes emit yellow light, and gallium nitride diodes emit blue light. Organic light emitting diodes OLED and inorganic light emitting diodes LED are classified by their chemical properties.

Because of the advantage of low energy consumption of the LED, the LED is widely applied to the lighting lamp, the brightness adjustment of the existing LED lamp generally adopts PWM (pulse-width modulation) dimming or DC (direct current) dimming, meanwhile, a plurality of LEDs on the market adopt self-adaptive dimming, but the existing LED self-adaptive dimming generally adopts light induction through a photoresistor, and an LED lamp group is also a monochromatic light source and can only carry out brightness adjustment and cannot automatically adjust color temperature; under dark ambient light at night, the brightness of the single-color LED reaches the maximum, and some users can feel very dazzling.

Disclosure of Invention

In view of this, the utility model aims at providing a LED self-adaptation dimming circuit not only can carry out automatic brightness control, can also be according to the use time quantum automatically regulated colour temperature, protect eyesight.

The utility model discloses a LED self-adaptation light-emitting diode (LED) adaptation circuit, including light sensor, a controller, clock circuit, LED driver IC, power supply circuit, white LED banks and yellow LED banks, light sensor and clock circuit are connected with the controller, two LED driver IC's signal reception end is connected with the controller respectively, LED driver IC's power receiving end and power supply circuit are connected, two LED driver IC's output respectively with white LED banks and yellow LED banks connection, the external alternating current of power supply circuit, thereby the controller is through sending the luminance of PWM signal control white LED banks and yellow LED banks to LED driver IC.

Further, the controller is an STC12 single chip microcomputer, the model of the LED drive IC is LM3404, and an IO pin of the STC12 single chip microcomputer is connected with a PWM signal receiving pin of the LED drive IC.

Further, the power circuit comprises a transformer, a bridge rectifier and a voltage stabilizer, wherein a primary winding of the transformer is externally connected with an alternating current power supply, a secondary winding of the transformer is connected with an input end of the bridge rectifier, an output end of the bridge rectifier is provided with a filter capacitor and the voltage stabilizer, and an output end of the voltage stabilizer is connected with a power input pin of the LED drive IC.

Further, the white LED lamp group and the yellow LED lamp group respectively comprise a plurality of white LED lamp beads and yellow LED lamp beads which are connected in series.

Further, the clock circuit is used for providing a clock signal for the controller, and the controller adjusts the proportion of the white LED lamp group and the yellow LED lamp group according to the clock signal.

The utility model has the advantages that: the utility model discloses a LED self-adaptive dimming circuit, through the luminance of light sensor collection ambient light to through the PWM signal of controller and the luminance of LED drive IC control white LED banks and yellow LED banks, realize self-adaptive dimming; meanwhile, the clock signal provided by the clock circuit is synchronous with the external time, so that the brightness of the yellow LED lamp group is improved by the controller at night, the brightness of the white LED lamp group is reduced, the light emitted by the white LED lamp group and the light emitted by the yellow LED lamp group are softer, and eyes are protected.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and that for a person skilled in the art, other relevant drawings can be obtained from the drawings without inventive effort:

fig. 1 is a schematic diagram of a dimming circuit according to the present invention;

fig. 2 is a schematic diagram of the power supply circuit of the present invention.

Detailed Description

As shown in fig. 1-2: the LED self-adaptive dimming circuit comprises a light sensor, a controller, a clock circuit, an LED drive IC, a power circuit, a white LED lamp group and a yellow LED lamp group, wherein the light sensor and the clock circuit are connected with the controller, signal receiving ends of the two LED drive ICs are respectively connected with the controller, the power receiving end of the LED drive IC is connected with the power circuit, output ends of the two LED drive ICs are respectively connected with the white LED lamp group and the yellow LED lamp group, the power circuit is externally connected with alternating current, and the controller controls the brightness of the white LED lamp group and the yellow LED lamp group by sending PWM signals to the LED drive ICs.

The utility model discloses a LED self-adaptive dimming circuit, through the luminance of light sensor collection ambient light to through the PWM signal of controller and the luminance of LED drive IC control white LED banks and yellow LED banks, realize self-adaptive dimming; meanwhile, the clock signal provided by the clock circuit is synchronous with the external time, so that the brightness of the yellow LED lamp group is improved by the controller at night, the brightness of the white LED lamp group is reduced, the light emitted by the white LED lamp group and the light emitted by the yellow LED lamp group are softer, and eyes are protected.

In this embodiment, the controller is an STC12 single chip microcomputer, the model of the LED driver IC is LM3404, an IO pin of the STC12 single chip microcomputer is connected to a PWM signal receiving pin DIM of the LED driver IC, the STC12 controls the duty ratio of the on-off time of the LED by changing the duty ratio of the PWM signal, the higher the duty ratio is, the longer the time for the LED to be on is compared with the time for the LED to be off, and the macroscopically the LED is brighter.

In this embodiment, power supply circuit includes the transformer, bridge rectifier and stabiliser, the external alternating current power supply of primary winding of transformer, the secondary winding of transformer is connected with bridge rectifier's input, bridge rectifier's output is equipped with filter capacitor and stabiliser, the output of stabiliser is connected with LED drive IC's power input pin, 220V alternating current exports 24V left and right DC power supply through vary voltage, rectification, filtering and step-down steady voltage processing back, 24V DC power supply inserts to LED drive IC LM 3404's power input pin VIN.

White LED banks and yellow LED banks inside contain a plurality of white LED lamp pearls and the yellow LED lamp pearl of establishing ties respectively in this embodiment, and the white LED banks and yellow LED banks after establishing ties are connected with the SW pin of LM3404 behind the positive pole connection inductance, and the negative pole is connected with LM 3404's CS pin.

In this embodiment, the clock circuit includes a crystal oscillator and a capacitor, and is a common peripheral device of the STC12 single chip microcomputer, the clock circuit is used for providing a clock signal for the controller, the controller adjusts the proportion of the white LED lamp group and the yellow LED lamp group according to the clock signal, for example, in a midday time period, the controller outputs a PWM signal with a higher duty ratio than that of the LED driving IC in which the yellow LED lamp group is located to the LED driving IC in which the white LED lamp group is located, so that the white LED lamp group is brighter than the yellow LED lamp group, and the light is more natural when the white LED lamp group is operated in the daytime; at night, the yellow LED lamp group is brighter than the white LED lamp group, so that the light is softer; however, the light is brighter in the night phase as a whole, and the duty ratio of the PWM signal for controlling either the white LED lamp set or the yellow LED lamp set is higher than that in the day time.

The specific implementation principle is as follows:

(1) the STC12 single chip microcomputer receives the ambient light data from the light sensor and adjusts the duty ratio of the output PWM signal according to the ambient light, and the stronger the ambient light is, the lower the duty ratio of the output PWM signal is, so that the overall brightness of the white LED lamp group or the yellow LED lamp group is lower, and the effect of saving electric energy and automatically dimming is achieved;

(2) adjusting color temperature, wherein the STC12 single chip microcomputer receives time data from a clock signal and adjusts the ratio of the duty ratios of two PWM signals for controlling a white LED lamp group or a yellow LED lamp group according to the time data; the closer to the midday time period, the brighter the white LED lamp group is compared with the yellow LED lamp group, so that the light is white and more natural; the closer to the midnight time period, the darker the white LED light set is compared to the yellow LED light set, so that the light appears yellow and softer.

Finally, it is noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.

Claims

1. An LED adaptive dimming circuit, characterized in that: the LED white LED lamp comprises a light sensor, a controller, a clock circuit, LED driver ICs, a power circuit, a white LED lamp group and a yellow LED lamp group, wherein the light sensor and the clock circuit are connected with the controller, signal receiving ends of the two LED driver ICs are respectively connected with the controller, the power receiving end of the LED driver IC is connected with the power circuit, output ends of the two LED driver ICs are respectively connected with the white LED lamp group and the yellow LED lamp group, the power circuit is externally connected with alternating current, and the controller controls the brightness of the white LED lamp group and the yellow LED lamp group by sending PWM signals to the LED driver ICs.

2. The LED adaptive dimming circuit of claim 1, wherein: the controller is an STC12 single chip microcomputer, the model of the LED driving IC is LM3404, and an IO pin of the STC12 single chip microcomputer is connected with a PWM signal receiving pin of the LED driving IC.

3. The LED adaptive dimming circuit of claim 1, wherein: the power circuit comprises a transformer, a bridge rectifier and a voltage stabilizer, wherein a primary winding of the transformer is externally connected with an alternating current power supply, a secondary winding of the transformer is connected with an input end of the bridge rectifier, an output end of the bridge rectifier is provided with a filter capacitor and the voltage stabilizer, and an output end of the voltage stabilizer is connected with a power input pin of the LED drive IC.

4. The LED adaptive dimming circuit of claim 1, wherein: the white LED lamp group and the yellow LED lamp group respectively comprise a plurality of white LED lamp beads and yellow LED lamp beads which are connected in series.

5. The LED adaptive dimming circuit of claim 1, wherein: the clock circuit is used for providing a clock signal for the controller, and the controller adjusts the proportion of the white LED lamp group and the yellow LED lamp group according to the clock signal.