KR20140092069A - lighting Apparatus and method of controlling thereof - Google Patents

Abstract

The present invention provides a lighting device and a controlling method thereof. The lighting device comprises a light emitting part including multiple light emitting diodes; an interface part for receiving an input coordinate of the correlated color temperature and brightness of light emitted from the light emitting part; a memory for storing multiple fixed value coordinates corresponding to the measured current value of each light emitting diode for implementing multiple correlated color temperature and brightness; a control part for determining estimated current values of each light emitting diode corresponding to the input coordinate by calculating the amount of variation between the fixed value coordinate and the input coordinate based on the fixed value coordinate near the input coordinate as a standard; and a driving part for driving each light emitting diode according to the estimated current value of each light emitting diode determined at the control part. Thus, the size of a memory storing a fixed value can be reduced since the number of the fixed values can be reduced by using the fixed values corresponding to the estimated current values and a value estimated by a formula simultaneously.

Description

≪ Desc / Clms Page number 1 > Lighting Apparatus and Method of Controlling &

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control method of a lighting apparatus, and more particularly, to a color temperature control and a dimming control method of a lighting apparatus.

Recently, light emitting diodes (LEDs) having advantages such as efficiency, color diversity, and design autonomy have been attracting attention as a light source of illumination .

Light emitting diodes generate light by exciting electrons across the bandgap between the conduction band and the valence band of the semiconductor active (light emitting) layer. The electron transition generates light of a wavelength varying according to the bandgap. Therefore, the color (wavelength) of the light emitted by the light emitting diode depends on the semiconductor material of the active layer of the light emitting diode.

As lighting products change from products such as incandescent or fluorescent lamps to LED lighting, functions that can not be realized in conventional lighting are being implemented. For example, a lighting apparatus capable of Correlated Color Temperature Conversion (CCT conversion) is being implemented.

Meanwhile, a lookup table on a program for implementing dimming and correlated color temperature (CCT) conversion of a conventional LED luminaire includes a number of bytes (STEP X CCT STEP) multiplied by a brightness step (STEP) and a CCT step (STEP) Byte) or a word (Word).

Considering that the memory area of a general microcontroller is 10 kBytes, the existing algorithm is inefficient.

For example, assuming that each brightness STEP and CCT STEP are divided by 256 steps, the product is 64 kBytes. To implement this, there is a problem that an external memory is added or a microcontroller having a large memory is used.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an illumination device capable of CCT control and dimming control capable of reducing a memory size and a control method thereof.

According to an aspect of the present invention, there is provided a lighting apparatus.

The illumination device includes a light emitting unit including a plurality of light emitting devices, an interface unit for receiving input coordinates of a correlated color temperature and brightness of light emitted from the light emitting unit from a user, a plurality of light emitting devices for realizing a plurality of correlated color temperatures and brightness A memory for storing a plurality of fixed value coordinates corresponding to the measured current values, calculating a variation amount between the fixed coordinate value and the input coordinate value based on the fixed value coordinates around the input coordinate, A controller for determining estimated current values of the light emitting device, and a driver for driving the light emitting devices according to the estimated current values of the light emitting devices determined by the control unit.

That is, in order to reduce the memory size, the measured fixed value is stored in the memory for the correlated color temperature and brightness at a specific position, and the estimated value estimated by the formula using the fixed value for the remaining correlated color temperature and brightness is determined through the control unit have.

According to another aspect of the present invention, there is provided a lighting device control method.

The method includes: receiving input coordinates of a correlated color temperature and brightness of light of a light emitting unit including a plurality of light emitting devices from a user; inputting measurement current values of respective light emitting devices for implementing a plurality of correlated color temperatures and brightness; Calculating a change amount between the fixed coordinate value and the input coordinate value based on the fixed value coordinate around the input coordinate from a memory storing a plurality of corresponding fixed value coordinates, Determining estimated current values of the light emitting devices corresponding to the input coordinates, and driving each of the light emitting devices according to estimated current values of the light emitting devices corresponding to the input coordinates.

According to the present invention, since the number of fixed values can be reduced by using the fixed value corresponding to the measured current values and the estimated value based on the mathematical expression together, it is possible to provide a lighting device capable of reducing the size of a memory for storing fixed values .

In addition, since all the brightness levels input from the user and the actual data, which are measured current values of the respective light emitting devices corresponding to the correlated color temperature stages, are not stored in the memory, a large amount of data memory is not required, It is economical to use a control unit (MCU).

In addition, using lookup tables and algorithms together, it is advantageous in terms of debugging and program maintenance.

The technical effects of the present invention are not limited to those mentioned above, and other technical effects not mentioned can be clearly understood by those skilled in the art from the following description.

1 is a schematic block diagram of a lighting apparatus according to an embodiment of the present invention.
FIG. 2 is a graph illustrating an algorithm of a lighting device control method according to an embodiment of the present invention.
3 is a flowchart showing a lighting device control method according to an embodiment of the present invention.
4 is a diagram showing an example of a UI (User Interface) of a remote controller according to the present invention.
5 to 7 are views showing an example of a method of controlling a lighting apparatus through a remote controller of a lighting apparatus according to an embodiment of the present invention.

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

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail. Rather, the intention is not to limit the invention to the particular forms disclosed, but rather, the invention includes all modifications, equivalents and substitutions that are consistent with the spirit of the invention as defined by the claims.

It will be appreciated that when an element such as a layer, region or substrate is referred to as being present on another element "on," it may be directly on the other element or there may be an intermediate element in between .

Although the terms first, second, etc. may be used to describe various elements, components, regions, layers and / or regions, such elements, components, regions, layers and / And should not be limited by these terms.

1 is a schematic block diagram of a lighting apparatus according to an embodiment of the present invention.

The lighting apparatus includes a light emitting unit 100, an interface unit 200, a memory 300, a control unit 400, and a driving unit 500.

The light emitting unit 100 may include a plurality of light emitting devices. The light emitting unit 100 may include a first light emitting device 110 and a second light emitting device 120 having different correlated color temperatures.

 For example, the light emitting unit 100 may include a first light emitting device 110 having a correlated color temperature of 3000K and a second light emitting device 120 having a correlated color temperature of 5000K.

Therefore, by controlling the currents of the first and second light emitting devices 110 and 120, the currents of the first and second light emitting devices 110 and 120 can be controlled according to the current ratio and the current supplied to the first light emitting device 110 and the second light emitting device 120, The correlated color temperature and brightness of the mixed light emitted from the light emitting portion can be variously adjusted.

The interface unit 200 receives input coordinates of correlated color temperature and brightness of light emitted from the light emitting unit 100 from a user.

The interface unit 200 may be embedded in a lighting apparatus or may be separated from the lighting apparatus, and may be connected to a remote controller by wired / wireless connection to receive a user's input.

For example, the interface unit 200 may include a key pad dome switch, a touch pad (static / static), a jog wheel, a jog switch, or the like .

Meanwhile, the interface unit 200 may receive a correlated color temperature and a brightness selection input of a user connected through a wired or wireless connection with a remote controller through a remote controller. The remote controller will be described later with reference to Figs.

The memory 300 stores a plurality of fixed value coordinates corresponding to the measured current values of each light emitting element for realizing a plurality of correlated color temperatures and brightness.

Originally, the luminous flux of the LED changes in proportion to the current, but the calculated value by the formula and the actual measured value have an error due to the external environment such as temperature, optical, and mechanism. Therefore, we use an algorithm based on real data using a lookup table.

However, when all the brightness levels input from the user and the actual data, which are the measured current values of the respective light emitting devices corresponding to the correlated color temperature stages, are stored in the memory, a large amount of data memory is required and may be uneconomical.

Accordingly, the present invention stores only the actual data of the measurement current values of the respective light emitting devices corresponding to some of the brightness steps and the correlated color temperature steps received from the user, in the memory 300. The remaining brightness steps and correlated color temperature steps in which the actual data of the measured current values of the respective light emitting elements are not stored in the memory 300 are calculated and calculated by the control unit 400 using a formula.

Accordingly, the brightness level corresponding to the actual measurement data and the coordinates of the correlated color temperature level are defined as fixed-value coordinates, and the remaining brightness level corresponding to the estimated value calculated by the control unit is calculated, The coordinates are defined as the estimated value coordinates. Therefore, the fixed value coordinate value may be the measurement current values of the respective light emitting elements. On the other hand, a method of expressing correlated color temperature and brightness may be expressed by the above-described current value, or may be expressed by various methods such as Duty or LUX.

On the other hand, these fixed value coordinates can be stored in a lookup table structure in the memory.

At this time, the coordinate value of the X axis of the lookup table corresponds to the correlated color step of the light emitting unit, and the coordinate value of the Y axis of the lookup table may correspond to the brightness level of the light emitting unit. Of course, conversely, the coordinate value of the X axis of the lookup table corresponds to the brightness level of the light emitting unit, and the coordinate value of the Y axis of the lookup table may correspond to the correlated color temperature step of the light emitting unit.

The controller 400 calculates a variation amount between the fixed coordinate value and the input coordinate value based on the fixed value coordinates around the input coordinate to determine the estimated current values of the respective light emitting elements corresponding to the input coordinates. The formula for estimating the estimated current values of each light emitting element corresponding to the input coordinates can be calculated in various forms such as a method of calculating the amount of change between the fixed coordinate value and the input coordinate value or a method using a trigonometric function. For example, the amount of change between the fixed value coordinate value and the input coordinate value can be calculated by comparing the position of the input coordinate with the fixed value coordinate around the input coordinate.

The control unit 400 may determine the estimated current values of the light emitting devices corresponding to the input coordinates and then drive the light emitting unit 100 through the driving unit 500 to be described later. At this time, the controller 400 can adjust the current value of each light emitting element by pulse width modulation.

The driving unit 500 drives each light emitting element according to the estimated current values of the light emitting elements determined by the controller 400. [

Hereinafter, a method of determining the estimated current value of each light emitting element corresponding to the input coordinates will be described in detail with reference to Fig.

FIG. 2 is a graph illustrating an algorithm of a lighting device control method according to an embodiment of the present invention.

Referring to FIG. 2, fixed-value coordinates are provided in the lookup table structure. The fixed value coordinate value corresponds one-to-one with the current value of each light emitting element to which the actual light emitting portion is to be driven. For example, the fixed value coordinate value of the point a of the lookup table may correspond to the first light emitting element 50 mA and the second light emitting element 60 mA. For reference, the correlated color temperature and brightness of the light emitted from the light emitting portion are determined according to the amount of current of each of the first light emitting element and the second light emitting element.

First, the fixed-value coordinates (a, b, c, d) around the input coordinate K are retrieved from the memory, and the fixed-value coordinates a, b, c, The current value of each light emitting element is calculated.

Hereinafter, the calculation of the current value of the first light emitting device will be described with reference to Equations (1) to (4). Here, the points a, b, c and d are fixed coordinate values closest to the input coordinate K, the x value is a unit graduation number from the point c to the X axis direction, and the y value is a unit graduation from the point c to the Y axis Means number.

Referring to Equation 1, the fixed values a, b, c, and d can be divided into ten levels. Then, the unit change amounts (Δcd, Δac, Δbd, Δab) of the divided steps are obtained through fixed values.

Referring to Equation (2), the amount of change in brightness (? Ac * y,? Bd * y) of the input coordinates is obtained. That is, a value obtained by multiplying the number of scales (y) in the Y-axis direction from the point c by the unit variation amount values (? Ac,? Bd) becomes the brightness variation amount.

(3), the first brightness change amount [Delta] ac * y is added to the current value of c to obtain the current amount of the ac point, and the second brightness change amount [Delta] bd * Is obtained.

Referring to Equation (4), the unit variation (? Bd_ac) is obtained by dividing the difference between the amount of current at the point bd and the amount of current at the ac point by 10. The color temperature change amount? Bd_ac * x is obtained by multiplying the unit variation amount by the number of graduations (x) in the X-axis direction from the point c.

Then, the amount of current of the input coordinate (K) can be determined by adding the color temperature variation amount (? Bd_ac * x) to the current amount of the ac point.

Meanwhile, the formula for estimating the input coordinate value can be calculated in various forms such as the method using the trigonometric function in addition to this embodiment, and the method of expressing the correlated color temperature and brightness can also be expressed by various methods such as Duty, LUX, .

3 is a flowchart showing a lighting device control method according to an embodiment of the present invention.

Referring to FIG. 3, the lighting device control method includes a step S1 of receiving input coordinates of correlated color temperature and brightness, a step S2 of calling a fixed value, a step S3 of calculating a variation amount of correlated color temperature and a brightness variation amount, A step S4 of determining the amount of current of each light emitting element, and a step S5 of driving each light emitting element.

The step S1 of receiving the input coordinates of the correlated color temperature and the brightness may receive the input coordinates of the correlated color temperature and brightness of the light of the light emitting unit including a plurality of light emitting elements from the user. For example, the user may receive input coordinates corresponding to a brightness of 80% and a correlated color temperature of 4000K from the user. It can receive input coordinates of correlated color temperature and brightness through various interfaces.

The step S2 of loading a fixed value may call up the fixed value coordinates around the input coordinate from a memory in which a plurality of fixed value coordinates corresponding to the measured current values of each light emitting element for implementing a plurality of correlated color temperatures and brightness . For example, a fixed value of four fixed-value coordinates adjacent to the input coordinate received from the user can be retrieved from the memory.

On the other hand, such fixed value coordinates can be stored in the memory in a look-up table structure.

The step S3 of calculating the correlated color temperature change amount and the brightness change amount may calculate the correlated color temperature change amount and the brightness change amount based on the fixed value coordinates around the input coordinates to determine the estimated current values of the respective light emitting elements corresponding to the input coordinates .

At this time, it is possible to calculate the amount of change in the correlated color temperature, and then calculate the amount of change in the correlated color temperature after calculating the amount of change in brightness.

The correlated color temperature variation and the brightness variation refer to the amount of change from the fixed value of the input coordinate to the input coordinate.

In the step S4 of determining the amount of current of each light emitting element, the amount of current of each light emitting element corresponding to the input coordinates can be determined through the correlated color temperature change amount and the brightness change amount.

The step S4 of driving each light emitting element applies a current amount of each light emitting element determined by the formula to each light emitting element to drive it.

At this time, the amount of current of each light emitting element can be adjusted by pulse width modulation (PWM).

4 is a diagram showing an example of a UI (User Interface) of a remote controller according to the present invention.

Referring to FIG. 4, the remote controller 700 includes a front portion 710 and a side portion 770, and the front portion 710 can be roughly divided into three regions. On the other hand, the side portion 770 includes a hold button 771 for inputting a user or the like for performing an overall function in response to the power of the remote controller 700 being on, .

Here, the side surface portion 770 is illustrated as having a lock button 771 on the right side of the remote controller 700, but the present invention is not limited thereto. The side surface portion 770 may be provided on one of the left side surface, It is possible.

In addition to the above-described lock button 771, the side portion 770 may further include a power button or a predetermined function button.

Hereinafter, the front portion 710 of the remote controller 700 will be described in detail.

As described above, the front panel 710 of the remote controller 700 is divided into a first area, a second area, and a third area in order to facilitate understanding of the present invention and for convenience of explanation.

First, the first area may be located above the remote controller 700. The first area may be located at the top of the remote controller 700. The first area may include a power button 720 in the form of a shade for power on / off and a lock button 771, A lock indication icon 730, and a first function icons 740, which indicate whether or not the lock button 700 is locked.

Here, the power button 721 may be implemented with a tact switch, for example, together with the lock button 771 of the side portion 770 described above. The power button 720 and the lock display icon 730 are provided for the corresponding button or icon so that the user can immediately recognize whether the power of the remote controller 700 is on / The backlight LED can be turned on / off.

If the lock button 771 is not provided on the side portion 770, the lock button 771 may be implemented in the first area by a tact switch as the power button 720. [ In addition, a side knob is applied to the lock button 771 of the side portion 770, and the position thereof is variable.

The first function icons 740 control the smart mode operation for at least one of the direct light select function icon 741, indirect light select function icon 742, direct light, indirect light, etc. according to the type of light emitting device The smart function icon 743 may be included. In other words, if the user directly selects at least one of the light, indirect, and smart functions through the remote controller 700, it indicates whether or not the selected function is activated. The first function icons 740 may be implemented in the form of a tact switch such as a touch key or the power button 771 to the lock button 720, The function may be directly selectable. Further, each first function icon may employ an individual backlight LED, and a yellow light may be used as a backlight LED. Therefore, the activation or non-activation of each first function icon may be displayed as described above depending on whether the function is executed or not.

These first function icons 741 to 743 are for a kind of group control and are for the convenience of the user when the same control is impossible according to the characteristics of the light emitting device. On the other hand, the smart function can be implemented or controlled even if one of direct, indirect, etc. is not necessarily selected.

The third area 760 may be located at the bottom of the remote controller 700 and includes second function icons 761 to 764. These second function icons 761 to 764 are for various mode control functions, while the first function icons 741 to 743 are for selection of the light emitting device or smart function. In this mode, for example, in FIG. 6, modes for a meal mode 761, a wine mode 762, a tee time mode 763, a reading mode 764, and the like may be provided.

 The second area 750 includes a touch screen. For example, a gradation of n points × m points may be applied to the second area 750. On the other hand, the touch screen of the second region 750 can recognize a user's input through gradation, for example, and can more precisely control color temperature and dimming. For example, it is possible to control the color temperature and the dimming in 256x256 steps.

On the other hand, the touch screen of the second area 750 may be associated with the aforementioned first area and third area 760 as well as the input for the above-described control, or may output various data together with display or audio separately . For example, when the power of the remote controller 700 is turned on, the power is turned on through the touch screen of the second area 750 or the battery remaining amount display of the remote controller 400, the memory status indication Amount, etc.), whether or not the lock button is activated, whether a predetermined function is activated, whether the selected light emitting device is displayed together with the map information when the first function icon is selected, and the like. In other words, the touch screen of the second area 750 may perform a window function for providing various function displays and related data of the remote controller 700, together with means for inputting point information for illumination control . The first function icons 740 and the second function icons 760 are described above. It should be noted that the first function icons 740 and the second function icons 760 are not necessarily constrained to be shown in the drawings and may be provided in various positions and shapes in a predetermined area of the remote controller 700 Can be implemented. For example, the positions of the first function icons 740 and the second function icons 760 may be interchanged, and the second function icons 760 may be located directly below the first function icons 740 Or the first function icons 740 may be located directly below or above the second function icons 760. [ Alternatively, at least one of the first function icons 740 and the second function icons 760 may be implemented in the vertical direction, not the horizontal direction or the horizontal direction, based on the front view. In addition, the area in which at least one of the first function icons 740 and the second function icons 760 are arranged is provided as a touch screen instead of a fixed icon, and the corresponding icon may be provided according to the user's selection have. In this case, at least one of the first function icons 740 and the second function icons 760 may be included in the touch screen of the second area and displayed in a predetermined area of the touch screen only at the request of the user.

Alternatively, the entire remote controller 700 may be in the form of a touch screen. In this case, each of the function icons may be displayed in a predetermined area of the touch screen at all times or only when a function is requested.

5 to 7 are views showing an example of a method of controlling a lighting apparatus through a remote controller of a lighting apparatus according to an embodiment of the present invention.

5 to 7, the vertical axis Y is assigned to the color temperature level and the horizontal axis X is assigned for the dimming level control, but the present invention is not limited thereto. In other words, it may be implemented as opposed to the above. Also, for convenience, the numbers of the vertical axis Y and the horizontal axis X may mean a pre-assigned control level.

Some of these control levels may be stored in a memory in the remote controller 400 as a plurality of fixed value coordinates corresponding to the measured current values of the respective light emitting elements. The fixed value coordinates at this time can be stored in a memory in a lookup table structure.

The control unit may determine an estimated value of the control level by calculating a change amount based on the fixed value coordinate value stored in the memory in the control unit.

5 to 7, the color temperature and the dimming level can be controlled individually or simultaneously. Of course, it is obvious that other functions, except color temperature and dimming, can be controlled in the same manner according to the user's selection.

It should be noted that the embodiments of the present invention disclosed in the present specification and drawings are only illustrative of specific examples for the purpose of understanding and are not intended to limit the scope of the present invention. It will be apparent to those skilled in the art that other modifications based on the technical idea of the present invention are possible in addition to the embodiments disclosed herein.

100: light emitting portion 110: first light emitting element
120: second light emitting device 200:
300: memory 400:
500: driving part 600:
700: remote controller

Claims (8)

A light emitting portion including a plurality of light emitting elements;
An interface for receiving input coordinates of a correlated color temperature and brightness of light emitted from the light emitting unit;
A memory for storing a plurality of fixed value coordinates corresponding to the measured current values of each light emitting element for realizing a plurality of correlated color temperatures and brightness;
A control unit for calculating a variation amount between the fixed coordinate value and the input coordinate value based on the fixed value coordinates around the input coordinate to determine estimated current values of the light emitting devices corresponding to the input coordinates; And
And a driving unit for driving each of the light emitting devices according to estimated current values of the light emitting devices determined by the control unit. The method according to claim 1,
Wherein the fixed value coordinates are stored in a look-up table structure in the memory. The method according to claim 1,
Wherein the light emitting unit includes a first light emitting device and a second light emitting device that have different correlated color temperatures from each other. The method of claim 3,
Wherein the controller calculates a current change amount with respect to the input coordinates based on the fixed coordinates using the four fixed coordinates around the input coordinates to calculate an estimated current value of the first light emitting device and the second light emitting device corresponding to the input coordinates Of the illuminating device. The method according to claim 1,
Wherein the control unit adjusts the current value of each light emitting element by pulse width modulation. Receiving input coordinates of correlated color temperature and brightness of light of a light emitting portion including a plurality of light emitting elements from a user;
Retrieving fixed-point coordinates around the input coordinates from a memory in which a plurality of fixed-value coordinates corresponding to the measured current values of each light-emitting device for implementing a plurality of correlated color temperatures and brightness are stored;
Calculating a variation amount between the fixed coordinate value and the input coordinate value based on the fixed value coordinates around the input coordinate to determine estimated current values of the respective light emitting elements corresponding to the input coordinate; And
And driving each of the light emitting devices according to estimated current values of the light emitting devices corresponding to the input coordinates. The method according to claim 6,
Wherein the fixed value coordinates are stored in a look-up table structure in the memory. The method according to claim 6,
Wherein the step of driving each light emitting element adjusts the estimated current values of each light emitting element by pulse width modulation.

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