KR102091785B1 - LED lighting control device and temperature control system using the same - Google Patents

Abstract

According to the present invention, an LED lighting control device detects dust concentration and turn on a cold white LED light or a warm white LED light according to the dust concentration. Even if dust concentration changes within a set range, wherein the dust concentration changes slightly above or below the set reference value, one of the two lights is turned on, and the color of the light is maintained.

Description

LED lighting control device and temperature control system using the same}

The present invention relates to an LED lighting control device and a temperature control system using the same, and more specifically, the temperature of the air conditioner using the LED lighting control device and the color temperature information of the LED lighting to change the color temperature of the LED lighting according to the surrounding environment. It relates to a temperature control system to control.

 In general, LEDs have high light conversion efficiency, very low power consumption, semi-permanent life, very fast response, suitable for miniaturization and light weight, relatively low optic nerve fatigue due to no light tremor, and impact resistance. This has the advantage of being large and eco-friendly because no gas for discharge is used.

LED lighting can produce various colors depending on the place of use or use. The LED light emits different colors depending on the color temperature. It emits a warm warm white color at a low temperature of 3000K and a cold white color at a high temperature of 5700K.

Using these characteristics, LED lighting can be selectively used according to the intended use.

Recently, warm white LEDs, cold white LEDs, and primary white LEDs have been obtained by changing the combination of fluorescently converted light by various known methods to control the composition and content of the phosphor.

Conventionally, as an example of an LED lamp capable of adjusting the color temperature, "Patents capable of adjusting color temperature" and "Light emitting device" are published in Korean Patent No. 10-0723912 and Korean Patent Publication No. 10-2008-0087242, respectively. have.

However, there is a problem in that only lighting of a predetermined color temperature can be used and adaptive change is possible depending on the surrounding environment.

(01) Republic of Korea Patent Registration No. 10-0723912, light emitting device, registration date: 2007.05.25 (02) Republic of Korea Patent Publication No. 10-2008-0087242, an electric stamp that can adjust the color temperature, Publication date: 2008.10.01

An object of the present invention is to provide an optimized color illumination according to the surrounding environment such as ambient temperature or dust concentration.

In addition, the present invention aims to save energy by sensing ambient temperature to provide lighting with a cool feeling when it is hot, lighting with a warm feeling when it is cold, and using it to control the operating temperature of the air conditioner. .

In addition, an object of the present invention is to provide a light emitting a warm warm 3000K color when the ambient temperature is low, and emitting a cold white 5700K color when the ambient temperature is high.

In addition, the present invention aims to detect the concentration of fine dust, such as dust and smoke, so that the color of the lighting changes when the fine dust concentration deteriorates.

The LED lighting control device according to the present invention is an LED lighting control device for controlling an LED light composed of a first LED module including LEDs emitting cold white and a second LED module including LEDs emitting warm white. A converter unit including a first converter that controls the brightness of the first LED module and a second converter that controls the brightness of the second LED; A sensor unit including a temperature sensor for sensing the ambient temperature; A control unit for outputting a control signal in the form of a PWM signal with a variable duty ratio varying according to the sensing temperature of the temperature sensor; And the controller controls the PWM signal to turn on the first LED module when the sensing temperature sensed by the sensor is greater than or equal to the first reference temperature, and the PWM signal when the sensing temperature sensed by the sensor is less than or equal to the second reference temperature. It characterized in that the control to turn on the second LED module.

According to the present invention, the color temperature of the LED light can be selected according to the ambient temperature, and the color temperature can be changed according to the temperature change.

Further, according to the present invention, it is possible to save energy by changing the bodily sensation temperature by turning on a cold feeling light when it is hot and turning on a warm feeling light when it is cold.

In addition, according to the present invention, the color temperature of the LED light is changed according to the dust concentration, so that when the dust concentration is high, the color temperature is changed to allow the user to know that the turbidity of air is deteriorated.

1 is a block diagram of an LED lighting control device according to an embodiment of the present invention.
Figure 2 shows the duty ratio of the first control signal and the second control signal according to the sensing temperature.
3 is a block diagram of a temperature control system according to an embodiment of the present invention.
Figure 4 shows the relationship between the duty ratio of the first control signal and the second control signal according to the turbidity (dust concentration) of the air.
5 is a block diagram of an LED lighting control device according to another embodiment of the present invention.

The present invention can be applied to various changes and may have various embodiments, and specific embodiments will be illustrated in the drawings and described in detail in the detailed description. However, this is not intended to limit the present invention to specific embodiments, and should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention. In the description of the present invention, when it is determined that a detailed description of known technologies related to the present invention may obscure the subject matter of the present invention, the detailed description will be omitted.

Terms such as first, second, A, and B can be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from other components. For example, the first component may be referred to as a second component without departing from the scope of the present invention, and similarly, the second component may be referred to as a first component. The term and / or includes a combination of a plurality of related described items or any one of a plurality of related described items.

The terms used in this application are only used to describe specific embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, the terms "include" or "have" are intended to indicate the presence of features, numbers, steps, actions, components, parts or combinations thereof described herein, one or more other features. It should be understood that the existence or addition possibilities of fields or numbers, steps, operations, components, parts or combinations thereof are not excluded in advance.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

<First Example>

1 is a block diagram of an LED lighting control device according to an embodiment of the present invention.

The LED lighting control device according to an embodiment is an LED lighting control for controlling the LED lighting 100 consisting of a first LED module including LEDs emitting cold white and a second LED module including LEDs emitting warm white. Device.

The LED lighting control device outputs a converter unit 200 for controlling the brightness of the LED lighting, a sensor unit 300 including a sensor for sensing ambient temperature, and a PWM signal variable according to the sensing temperature of the sensor The converter unit 400 includes a control unit.

The first LED module is composed of a number of LEDs that emit a color temperature of 3000K and emits a warm warm white color, and the second LED module is composed of a number of LEDs that emit a color temperature of 5700K and is cold It emits cool white.

The converter unit 200 may include a first converter that controls the brightness of the first LED module and a second converter that controls the brightness of the second LED.

The first converter and the second converter receive an PWM signal as an AD converter that converts an analog signal to a digital signal, and control dimming of the LED according to the duty ratio of the PWM signal. The converter unit is a power supply device that receives commercial power for lighting of the LED and converts it into rated power required for lighting, and supplies PWM for switching the transformer and the transformer in a PWM manner to convert the commercial power to the rated power. It includes a power factor improving part that improves the power factor of commercial power while having a wealth and emphasizes energy efficiency, and a dimming control part that adjusts dimming according to the PWM signal. Since the converter can be applied in various ways using a known technique, detailed description thereof will be omitted in the present invention.

As the sensor unit 300, an NTC thermistor (Negative Temperature Coefficient thermistor) temperature sensor whose resistance value changes according to temperature may be used. The sensor unit 300 changes the resistance value according to the temperature, converts it into a voltage, and transmits it to the control unit 400.

The control unit 400 generates a control signal according to the temperature. The control signal is a PWM type signal, and the converter unit 200 may adjust dimming of the LED module according to the PWM signal.

The control signal includes a first control signal (PWM-C) controlling the first converter and a second control signal (PWM-W) controlling the second converter.

The control unit 400 may include an AD converter for converting an analog type sensing signal into a digital signal and a memory in which a preset reference temperature is stored. The first reference temperature and the second reference temperature are stored in the memory. The control unit 400 compares the sensing temperature and the reference temperature to generate a first control signal and a second control signal.

The first reference temperature is higher than the second reference temperature. For example, the first reference temperature may be 30 ° C, and the second reference temperature may be 10 ° C.

The control unit 400 compares the sensing temperature with the reference temperature to generate a first control signal that controls the first converter when the sensing temperature is greater than or equal to the first reference temperature, so that the first LED module is turned on, and the sensing temperature is second. When the temperature is below the reference temperature, a second control signal is generated to turn on the second LED module.

When the temperature is hotter than the first reference temperature, the cooling white LED light is turned on, so that the user can get a cool feeling, and when the temperature is colder than the second reference temperature, the warm white LED light is turned on. You can feel warm.

Then, in more detail the operation of the converter unit, the converter unit 200 receives the PWM control signal of the control unit 400 to control the dimming of the LED module. The converter unit 100 supplies a DC current corresponding to the duty ratio of the PWM to the LED module. The dimming terminal (not shown) of the converter receives the PWM control signal, and the average voltage according to the duty of the PWM control signal becomes the dimming voltage. For example, when the dimming input voltage range is 0.2V to 3V, if the PWM duty ratio is 100%, 3V is the dimming voltage, and if the PWM duty ratio is 0%, the dimming voltage is 0.2V or less. And if the duty ratio is 50%, 1.6V becomes the dimming voltage. The LED drive current can be adjusted to an analog voltage.

The LED modules having different color temperatures can be controlled according to the temperature by the control signal and the operation of the converter unit.

For example, when the first reference temperature is set to 30 ° C and the second reference temperature is set to 10 ° C, when the sensing temperature is 30 ° C or more, the first control signal is 100% and the second control signal is 0%. As a result, only the first LED module with a cool color temperature of 5700K is turned on. On the contrary, when the sensing temperature is 10 ° C or less, the first control signal is 0%, the second control signal is 100%, and the second temperature is 3000K. Only the LED module is turned on. In addition, when the sensing temperature is between the first reference temperature and the second reference temperature, the duty ratio is linearly changed in proportion to the difference between the two reference temperatures. In the embodiment, the duty ratio due to PWM due to the temperature difference of 20 degrees is changed to 5% duty per degree of temperature. Therefore, when the sensing temperature is 20 ° C, the duty ratio of the first control signal is 50% and the duty ratio of the second control signal is 50%, so that the first LED module and the second LED module are adjusted to 50% brightness respectively.

FIG. 2 shows the duty ratio of the first control signal and the second control signal according to the sensing temperature. FIG. 2 (a) shows the first control signal, and FIG. 2 (b) shows the second control signal. It is shown. The first control signal is PWM-C because it is a PWM signal that controls the cold white color temperature, and the second control signal is PWM-W because it is a PWM signal that controls the warm white color temperature.

It can be seen that the first control signal gradually decreases in duty ratio as the temperature decreases, and the second control signal gradually decreases as the temperature increases.

In the above and in hot weather, when the LED module having the color temperature of cold white is turned on, the actual human sensation temperature feels a difference of about 2 degrees or more. That is, when the temperature is 30 degrees Celsius, the sensation temperature is felt to be about 26 to 28 degrees, so if it is used in an air conditioner, energy can be saved.

<Second Example>

FIG. 3 shows a temperature control system using the first exemplary LED lighting device of FIG. 1.

The temperature control system according to the third embodiment includes an LED lighting device further including a first communication unit 500 in the embodiment of FIG. 1 and an air conditioner for controlling temperature while communicating with the LED lighting device.

The air conditioner receives color temperature information from the second communication unit 600 and the second communication unit that transmits and receives data to and from the first communication unit 500 of the LED lighting device, and controls the temperature of the air conditioner according to the color temperature information ( 600).

The temperature controller receives color temperature information, that is, whether cold white lighting is on or warm white lighting is on, and controls the temperature of the air conditioner accordingly.

When the color temperature is cold white, the air conditioner is operated higher than the temperature set by the user, and when the color temperature is warm white, the air conditioner is operated lower than the temperature set by the user.

For example, when the user sets the temperature of the air conditioner (air conditioner) in summer to 26 degrees, when the cold white light is turned on, the air conditioner receives color temperature information from the LED light, and is set when the received color temperature is cold white Try to operate about 2 degrees higher than the temperature. That is, the user has set 26 degrees, but operates the air conditioner at 28 degrees to save energy.

Even if the air conditioner is operated about 2 degrees higher than the temperature set by the user, the user's sensation temperature is slightly lower due to the cold white light, so it can have a similar effect to the actual operation at 26 degrees.

Conversely, when the warm white light is turned on in winter, energy can be saved by operating at a temperature slightly lower than the temperature set by the user. When the warm white light is turned on, the user's sensation temperature increases somewhat, so even if it is operated at a low temperature of about 2 degrees, similar effects can be seen.

<Third Example>

In the embodiment of FIG. 1, the sensor unit may include a dust sensor that detects dust and smoke.

The dust sensor is made of an LED light emitting part and a photo transistor light receiving part, and when there is no dust and smoke, light emitted from the light emitting part enters the light receiving part of the photo transistor and converts it into a voltage to apply a voltage according to the turbidity of external air to the control unit. do. The control unit generates a control signal according to the turbidity of the outside air.

At this time, the first reference concentration and the second reference concentration are stored in the memory of the control unit, and the control unit compares the dust concentration detected by the dust sensor with the reference concentration to generate a control signal accordingly.

The control unit generates the first control signal when the dust concentration is less than or equal to the first reference concentration so that the first LED module is turned on, and when the dust concentration is greater than or equal to the second reference concentration, generates the second control signal to generate the second LED module. Let it turn on. That is, when there is no dust or smoke, the cold white light is turned on, and when the dust or smoke is higher than the reference value, the warm white light is turned on. When the turbidity of the air is not good due to the large amount of dust, the warm white light of the red system with a long wavelength turns on, so the light has a long effect even though the turbidity is not good.

When the turbidity of the surrounding air is good, the duty ratio of the first control signal is 100%, so the maximum output current set in the first converter flows to the first LED module, and the duty ratio of the second control signal is output to 0%. In the second converter, the set minimum output current flows through the second LED module. Since the minimum output current is usually 0A, no current flows through the second LED module.

Conversely, when the turbidity of ambient air is poor, the duty ratio of the first control signal becomes 0%, and the duty ratio of the second control signal becomes 100%, so that only current flows in the second LED module.

When the dust concentration is between the first reference concentration and the second reference concentration, it may be changed into a hysteresis form without maintaining linearity such as temperature.

As the turbidity is good, the dust concentration below the first reference concentration is detected, and the dust concentration increases slightly when the first LED module is turned on, so the PWM control signal is maintained even if it is above the first reference concentration, so that the color of the LED lighting remains the same. Keep it.

When the dust concentration continuously increases to a level higher than or equal to the second reference concentration, the duty ratio of the second control signal is 100% so that the second LED module is turned on. By changing the hysteresis form without changing linearly, it can function to indicate that dust has increased. Therefore, the user can take measures such as ventilation when the color of the LED module changes.

Conversely, due to poor turbidity, the dust concentration above the second reference concentration is detected and the dust concentration is slightly reduced while the second LED module is on. Keep it as it is.

When the concentration of dust continuously decreases to become less than or equal to the first reference concentration, the duty ratio of the first control signal is set to 100% so that the first LED module is turned on.

FIG. 4 shows the relationship between air turbidity (dust concentration) and the control signal. FIG. 4 (a) shows when turbidity is good, and FIG. 4 (b) shows when turbidity is bad.

Referring to FIG. 4, it can be seen that the duty ratio of the control signal does not change within a set range by setting a predetermined range for the first reference concentration (when turbidity is good) and the second reference concentration (when turbidity is bad).

<Fourth Example>

5 illustrates a case where the sensor unit 300 includes both a temperature sensor and a dust sensor according to another embodiment of the present invention.

When the temperature sensor and the dust sensor are used at the same time, it can be used in the form of USB. That is, the sensor unit 300 may include an AD converter in the form of USB. The sensor signal is converted into a digital signal in the AD converter and input to the control unit 400 through the USB port. Of course, the control unit 400 also has a USB port corresponding to the sensor unit.

The control unit 400 may automatically recognize either a temperature sensor or a fine sensor. The automatic recognition is performed by a USB type protocol mounted on the sensor unit 300 and the control unit 400.

When the temperature sensor is recognized, it operates as in the first embodiment described above, and when the dust sensor is recognized, it operates as in the third embodiment described above. The operation method is the same as the above-described example, so the description is omitted in this embodiment.

The embodiments have been mainly described above, but this is merely an example and does not limit the present invention, and those of ordinary skill in the art to which the present invention pertains have not been exemplified above in a range that does not depart from the essential characteristics of the present embodiment. It will be appreciated that various modifications and applications are possible. For example, each component specifically shown in the embodiments can be implemented by modification. And differences related to these modifications and applications should be construed as being included in the scope of the invention defined in the appended claims.

100: LED light 200: converter unit
300: sensor unit 400: control unit
500: first communication unit 600: second communication unit
700: temperature control

Claims (2)

As an LED lighting control device for controlling the LED light consisting of a first LED module including a LED emitting light white and a second LED module including a LED emitting a warm white,
A converter unit including a first converter that controls the brightness of the first LED module and a second converter that controls the brightness of the second LED;
A temperature sensor sensing ambient temperature, a dust sensor sensing dust and smoke concentration, an AC converter converting sensing signals sensed by the temperature sensor and dust sensor into digital signals; And a sensor unit including a USB port. And
It includes a control unit for outputting a control signal in the form of a PWM signal having a variable duty ratio according to the sensing temperature of the temperature sensor or a signal sensed by the dust sensor,
The control signal includes a first control signal for controlling the first converter and a second control signal for controlling the second converter,
The control unit,
It includes a USB port corresponding to the USB port,
Automatically detects the temperature sensor or dust sensor of the sensor unit,
When a temperature sensor is detected,
When the sensing temperature sensed by the sensor is greater than or equal to the first reference temperature, the duty ratio of the first control signal becomes 100% and the first LED module is controlled to turn on.
When the sensing temperature sensed by the sensor is less than or equal to the second reference temperature, the duty ratio of the second control signal becomes 100% and the second LED module is controlled to turn on.
When a dust sensor is detected,
When the dust concentration detected by the dust sensor is less than or equal to the first reference concentration, the duty ratio of the first control signal is 100%, and the first LED module is controlled to turn on.
When the dust concentration is greater than or equal to the second reference concentration, the duty ratio of the second control signal is 100% and the second LED module is controlled to turn on,
When the first LED module is turned on, the duty ratios of the first control signal and the second control signal are maintained even if the dust concentration increases within a preset range and becomes greater than or equal to the first reference concentration. 2 Control the duty ratio of the control signal to 100% and turn on the second LED module.
When the second LED module is turned on, the duty ratios of the first control signal and the second control signal are maintained even if the dust concentration decreases within a set range and falls below a second reference concentration. 1 LED lighting control device characterized in that the control signal is turned on so that the duty ratio of the control signal is 100%.

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