KR102191118B1 - LED Color and Intensity control Apparatus - Google Patents

Abstract

In the present invention, in the LED color and illuminance control device, the rectifier diode unit 31 for receiving the input AC power supply 10 and rectifying DC power; A converter unit 45 for receiving the DC power output from the rectifying diode unit 31 and outputting the first output voltage Vo1; A constant current circuit unit 50 receiving a first output voltage Vo1 of the converter unit 45 and supplying a second output voltage Vo2 of a constant current; First and second LED groups 19 and 20 which emit light by receiving the second output voltage Vo2 of the constant current circuit unit 50; A first switch 21 for controlling the flow of current in the first LED group 19; A second switch 22 for controlling the flow of current in the second LED group 20; The first switch 21 and the second switch 22 include a controller 60 for controlling LED color and illuminance to control an asymmetric duty. Suggest.

Description

LED Color and Intensity Control Apparatus}

The present invention relates to an apparatus for controlling color and illuminance of an LED (light emitting diode), which has recently been most spotlighted as lighting. LEDs are high-efficiency optical semiconductor devices and are used for various lighting, and recently, there is an increasing demand to change the color and illuminance of LEDs. The technical field of the present invention relates to an LED color and illuminance control device.

Previously, for LED lighting, major companies applied for patents for various methods to control the illuminance. In Samsung Electronics, Republic of Korea Patent Publication No. 10-1043746, announced on June 23, 2011 (hereinafter referred to as [Patent Document 1]) uses an LLC (inductor-inductor-capacitor) resonant half-bridge converter. It characterized in that to control.

In the case of MagnaChip, Korean Registered Patent Publication No. 10-1189253, published date 2012. 10. 09. (hereinafter referred to as [Patent Document 2]), illuminance control through the duty control of the main switch in a boost converter Characterized in that.

In Inosem Korea Co., Ltd., Korean Patent Publication No. 10-1189253, announced on October 09, 2012 (hereinafter referred to as [Patent Document 3]), controls the color temperature for the control of the first and second cool-warm smart LED package modules. The color coordinates (x,y) calculated through the algorithm engine unit and the dimming ratio (Duty) according to the given illuminance are converted into a table, and based on the related color temperature values, red and yellow , Blue (Blue) and white (White) It is a technical feature to control by adjusting the intensity of each light.

In the existing [Patent Literature 1] to [Patent Literature 3], there is a problem that changing the illuminance of the LED or controlling the color of the LED uses a complex control method, and it is impossible to simultaneously control the color and illuminance.

[Patent Document 1] Republic of Korea Patent Publication No. 10-1043746, Announcement date 2011. 06. 23. [Patent Document 2] Korean Patent Publication No. 10-1189253, Announcement Date 2012. 10. 09. [Patent Document 3] Republic of Korea Patent Publication No. 10-1189253, Announcement Date 2012. 10. 09.

In the present invention, it is a technical feature to simultaneously control the illuminance and color of the LED in a simple manner. In order to change the existing LED illuminance, it is a method of dimming through the duty control of the main switch in the LED power supply. However, in the present invention, it is possible to basically change the illuminance and color of the LED by using an asymmetric duty control method. In addition, the biggest technical feature is that the LED illuminance for a predetermined color can be changed using a frequency control method for a predetermined color. Accordingly, the present invention is to provide a power supply device capable of simultaneously controlling the color and illuminance of the LED.

The present invention intends to propose a method of simultaneously controlling the color and illuminance of an LED using an asymmetric control method. In the conventional LED control of [Patent Literature 1] to [Patent Literature 2], it is possible to control the illuminance through the duty control of the main switch in the LED power supply. In addition, in [Patent Document 3], the color coordinates (x,y) and the dimming ratio (Duty) according to the given illuminance are converted into a table, and based on the related color temperature values, red and yellow ( Red, yellow, blue and white LEDs are used because the intensity of each light of Yellow, Blue, and White LEDs is controlled and controlled. There was a problem. In addition, in the above [Patent Document 1] to [Patent Document 3], there is a problem in that only illuminance control or hue control is performed, but hue and illuminance are not simultaneously controlled. Therefore, in the present invention, it is possible to simultaneously control color and illuminance using a simple asymmetric duty control and frequency control as a solution to the problem in the present invention.

The control device of the present invention controls a first LED group 19 having a first color and a second LED group 20 having a second color for controlling the color of the LED, and only 2 It has the advantage of having the simplest structure to control two LED groups of different colors. In addition, an asymmetric duty control is performed to control the first LED group 19 having the first color and the second LED group 20 having the second color. There is an effect that can control the color. In addition, since the illuminance of the first and second LED groups can be controlled through frequency control, there is an increased effect of controlling color and illuminance through a simple LED control device.

1 is an LED color and illuminance control device overall system (first embodiment)
2 is an LED color and illuminance control device overall system (second embodiment)
3 is a manufactured LED color and illuminance control device (first embodiment)
4 is an LED color and illuminance control device overall system (third embodiment)
5 is an LED color and illuminance control device overall system (4th embodiment)
6 is a manufactured LED color and illuminance control device (second embodiment)
7 is a constant current circuit (first embodiment)
8 is a constant current circuit (second embodiment)
9 is a detailed circuit diagram of an LED color and illuminance control device (first embodiment)
10 is a detailed circuit diagram of an LED color and illuminance control device (second embodiment)
11 is a detailed circuit diagram of an LED color and illuminance control device (third embodiment)
12 is a detailed circuit diagram of an LED color and illuminance control device (fourth embodiment)
13 is an LED color and illuminance control device
14 is an asymmetric duty control signal

[Example]

The present invention will be described in detail with reference to the accompanying drawings as follows.

1 and 2 show an LED color and illuminance control device overall system (first and second embodiments).

The entire system of the proposed LED color and illuminance control device transmits the DC voltage rectified from the input AC power supply 10 through the input filter 30 and the rectifier diode 31 through the converter 45 to the first output voltage Vo1. ). The second output voltage Vo2 of a constant current suitable for light emission of the first and second LED groups due to the constant current circuit unit 50 to which the first output voltage Vo1 is applied. ). When the second output voltage Vo2 of the constant current is applied, the first and second LED groups 19 and 20 are turned on and off of the first and second switches 21 and 22. It is characterized in that it emits light by off).

The converter unit 45 is a flyback converter circuit, and the configuration of the converter unit 45 includes a power factor improvement inductor 11, a main transformer 41 of the flyback converter, a main switch 14, and a rectifier diode. (12) and output stage capacitor (13). The control of the flyback converter is characterized in that it is controlled through the main controller 40 of the converter based on the information of the voltage of the first output voltage Vo1 and the current detection resistance of the current detector 15.

Above all, on and off control of the first and second switches 21 and 22 is performed by an asymmetric duty control. That is, when the duty ratio of the first switch 21 increases, the duty ratio of the second switch 22 decreases, and when the duty ratio of the first switch 21 decreases, It is characterized in that the duty ratio of the second switch 22 is increased.

The first and second switches 21 and 22 are characterized in that a gate signal generated from the controller 60 for controlling LED color and illumination is controlled through a buffer 23 and an inverter.

In FIG. 1 (the first embodiment), the asymmetric duty control resistor 80 is composed of a fixed resistor 25 and a variable resistor 26 for asymmetric duty control, and is controlled by varying the variable resistor 26 for asymmetric duty control. 1,2 It is characterized in that the color and illuminance of the LED group are changed.

In FIG. 2 (second embodiment), duty control and frequency control are simultaneously possible through the asymmetric duty control resistor 80 and the frequency control resistor 90. The asymmetric duty control resistor 80 is composed of a fixed resistor 25 and a variable resistor 26 for asymmetric duty control, and the first and second LED groups are made by varying the variable resistor 26 for asymmetric duty control. It is characterized in that the color and illuminance of are changed. In addition, the frequency control resistor 90 is composed of a frequency control fixed resistor 35 and a frequency control variable resistor 36, and the first and second LED groups by varying the frequency control variable resistor 36 It is characterized in that the illuminance of is changed. In particular, when the frequency is lowered, the luminance of the first and second LED groups increases. In addition, as the frequency increases, the light emission intensity of the first and second LED groups is also lowered.

In FIG. 2 (the second embodiment), there is an advantage that the variable ratio of the illuminance of the first and second LED groups can be further increased than that of FIG. 1 (the first embodiment).

3 shows the manufactured LED color and illuminance control device (first embodiment). Above all, it has a height (H) of 2 [cm] or less to match the size of a conventional fluorescent lamp, and it is manufactured to be elongated.

4 and 5 show the entire system of the LED color and illuminance control device (the third and fourth embodiments).

The entire system of the proposed LED color and illuminance control device transmits the DC voltage rectified from the input AC power supply 10 through the input filter 30 and the rectifier diode 31 through the converter 45 to the first output voltage Vo1. ). The second output voltage Vo2 of a constant current suitable for light emission of the first and second LED groups due to the constant current circuit unit 50 to which the first output voltage Vo1 is applied. ). When the second output voltage Vo2 of the constant current is applied, the first and second LED groups 19 and 20 are turned on and off of the first and second switches 21 and 22. It is characterized in that it emits light by off).

The converter unit 45 is a forward-flyback converter circuit, and the configuration of the converter unit 45 includes a power factor improvement inductor 11, a main transformer 41 of a forward-flyback converter, and a main It consists of a switch 14, a rectifier diode 12, and an output stage capacitor 13. The forward-flyback converter is controlled through the main controller 40 of the converter based on the information of the voltage of the first output voltage Vo1 and the current detection resistance of the current detection unit 15.

Above all, on and off control of the first and second switches 21 and 22 is performed by an asymmetric duty control. That is, when the duty ratio of the first switch 21 increases, the duty ratio of the second switch 22 decreases, and when the duty ratio of the first switch 21 decreases, It is characterized in that the duty ratio of the second switch 22 is increased.

The first and second switches 21 and 22 are characterized in that a gate signal generated from the controller 60 for controlling LED color and illumination is controlled through a buffer 23 and an inverter.

In Fig. 4 (third embodiment), the asymmetric duty control resistor 80 is composed of a fixed resistor 25 and a variable resistor 26 for asymmetric duty control, and is controlled by varying the variable resistor 26 for asymmetric duty control. 1,2 It is characterized in that the color and illuminance of the LED group are changed.

In FIG. 5 (the fourth embodiment), duty control and frequency control are simultaneously possible through the asymmetric duty control resistor 80 and the frequency control resistor 90. The asymmetric duty control resistor 80 is composed of a fixed resistor 25 and a variable resistor 26 for asymmetric duty control, and the first and second LED groups are made by varying the variable resistor 26 for asymmetric duty control. It is characterized in that the color and illuminance of are changed. In addition, the frequency control resistor 90 is composed of a frequency control fixed resistor 35 and a frequency control variable resistor 36, and the first and second LED groups by varying the frequency control variable resistor 36 It is characterized in that the illuminance of is changed. In particular, when the frequency is lowered, the luminance of the first and second LED groups increases. In addition, as the frequency increases, the light emission intensity of the first and second LED groups is also lowered.

In Fig. 5 (the fourth embodiment), there is an advantage that the variable ratio of the illuminance of the first and second LED groups can be further increased than that of Fig. 4 (the third embodiment).

6 shows the fabricated LED color and illuminance control device (second embodiment). Above all, it has a height (H) of 2 [cm] or less to match the size of a conventional fluorescent lamp, and it is manufactured to be elongated.

7 shows a constant current circuit portion (first embodiment). The constant current circuit portion of FIG. 7(a) is composed of a constant current diode 71 and first and second constant current ICs 73 and 74, and the constant current circuit portion of FIG. 7(b) is a constant current diode ( 71) and the first, second, and third constant current ICs 73,74,75, and the constant current circuit portion of FIG. 7(c) is a constant current diode 71 and the first, second, third, and fourth, It consists of 5,6 constant current ICs (73,74,75,76,77,78). It is a technical feature that the number of constant-current ICs is designed in consideration of the amount of current required by the individual LED elements of the first and second LED groups.

8 shows a constant current circuit portion (second embodiment). FIG. 8(a) is characterized in that the first output voltage Vo1 is supplied, and the coupling inductor 62 operates as a current source to supply the second output voltage Vo2, and FIG. 8(c) It is characterized in that the first output voltage Vo1 is supplied and a constant current is supplied through a linear regulator composed of the transistor 67.

9 and 10 show a detailed circuit diagram of an LED color and illuminance control device (Examples 1 and 2), and FIGS. 11 and 12 show a detailed circuit diagram of an LED color and illuminance control device (Example 3 and 4).

In FIG. 9 (first embodiment), the asymmetric duty control resistor 80 is composed of a fixed resistor 25 and a variable resistor 26 for asymmetric duty control, and is controlled by varying the variable resistor 26 for asymmetric duty control. 1,2 It is characterized in that the color and illuminance of the LED group are changed.

In FIG. 10 (second embodiment), duty control and frequency control are simultaneously possible through the asymmetric duty control resistor 80 and the frequency control resistor 90. The asymmetric duty control resistor 80 is composed of a fixed resistor 25 and a variable resistor 26 for asymmetric duty control, and the first and second LED groups are made by varying the variable resistor 26 for asymmetric duty control. It is characterized in that the color and illuminance of are changed. In addition, the frequency control resistor 90 is composed of a frequency control fixed resistor 35 and a frequency control variable resistor 36, and the first and second LED groups by varying the frequency control variable resistor 36 It is characterized in that the illuminance of is changed. In particular, when the frequency is lowered, the luminance of the first and second LED groups increases. In addition, as the frequency increases, the light emission intensity of the first and second LED groups is also lowered.

In FIG. 11 (third embodiment), the color and illuminance of the first and second LED groups are changed by varying the voltage of the variable voltage source 81 for asymmetric duty control.

In FIG. 12 (the fourth embodiment), duty control and frequency control are simultaneously possible through the variable voltage source 81 for asymmetric duty control and the variable voltage source 91 for frequency control. In particular, it is possible to control the color and illuminance of LED lighting through duty control. In addition, the principle of frequency control is that when the frequency is lowered, the light emission intensity of the first and second LED groups increases. In addition, as the frequency increases, the light emission intensity of the first and second LED groups is also lowered.

13 shows an LED color and illuminance control device. The first LED group 19 is controlled by the first switch 21 by receiving the second output voltage Vo2 of the constant current generated from the constant current circuit unit 50, and the second LED group ( Group) (20) is controlled by the second switch (22).

Above all, on and off control of the first and second switches 21 and 22 is performed by an asymmetric duty control. That is, when the duty ratio of the first switch 21 increases, the duty ratio of the second switch 22 decreases, and when the duty ratio of the first switch 21 decreases, It is characterized in that the duty ratio of the second switch 22 is increased.

The first and second switches 21 and 22 are characterized in that a gate signal generated from the controller 60 for controlling LED color and illumination is controlled through a buffer 23 and an inverter.

14 shows an asymmetric duty control signal. 14(a), 14(b), and 14(c), it can be seen that the operation is performed in an asymmetric duty control.

In the present invention, the LED color and illuminance control controller 60 detects a change in the resistance values of the asymmetric duty control resistor 80 and the frequency control resistor 90, and the variable voltage source 81 for control and the variable voltage source 91 for frequency control It is a technical feature that the duty of the first and second switches 21 and 22 is controlled by detecting a change in the voltage value of ). In addition, in order to prevent a flicker phenomenon in which flicker occurs in the first and second LED groups, it is recommended that the switching frequency of the first and second switches 21 and 22 be driven at 30 [kHz] or more. desirable. Therefore, it is a technical feature that the variable frequency range of the frequency is driven in the range of 30 [kHz] to 200 [kHz].

In the present invention, in the LED color and illuminance control device, the rectifier diode unit 31 for receiving the input AC power supply 10 and rectifying DC power; A converter unit 45 for receiving the DC power output from the rectifying diode unit 31 and outputting the first output voltage Vo1; A constant current circuit unit 50 receiving a first output voltage Vo1 of the converter unit 45 and supplying a second output voltage Vo2 of a constant current; First and second LED groups 19 and 20 which emit light by receiving the second output voltage Vo2 of the constant current circuit unit 50; A first switch 21 for controlling the flow of current in the first LED group 19; A second switch 22 for controlling the flow of current in the second LED group 20; The first switch 21 and the second switch 22 include a controller 60 for controlling LED color and illuminance for performing asymmetric duty control or frequency control; By operating the first and second switches 21 and 22 under asymmetric duty control, the overall color and illuminance generated in the first and second LED groups 19 and 20 are variable. The total illuminance generated in the first and second LED groups 19 and 20 is variable through the variable frequency of the first and second switches. ) To propose an LED color and illuminance control device.

In addition, in the present invention, in the LED color and illuminance control device, the rectifier diode unit 31 for receiving the input AC power supply 10 and rectifying the DC power; A converter unit 45 for receiving the DC power output from the rectifying diode unit 31 and outputting the first output voltage Vo1; A constant current circuit unit 50 receiving a first output voltage Vo1 of the converter unit 45 and supplying a second output voltage Vo2 of a constant current; First and second LED groups 19 and 20 which emit light by receiving the second output voltage Vo2 of the constant current circuit unit 50; A first switch 21 for controlling the flow of current in the first LED group 19; A second switch 22 for controlling the flow of current in the second LED group 20; The first switch 21 and the second switch 22 include a controller 60 for controlling LED color and illuminance for performing asymmetric duty control or frequency control; By operating the first and second switches 21 and 22 under asymmetric duty control, the overall color and illuminance generated in the first and second LED groups 19 and 20 are variable. The total illuminance generated in the first and second LED groups 19 and 20 is variable through the variable frequency of the first and second switches. ) To propose an LED color and illuminance control device.

In addition, in the present invention, in the LED color and illuminance control apparatus, the first switch 21 for controlling the flow of current in the first LED group (Group) 19; A second switch 22 for controlling the flow of current in the second LED group 20; The first switch 21 and the second switch 22 include a controller 60 for controlling LED color and illuminance for performing asymmetric duty control or frequency control; By operating the first and second switches 21 and 22 under asymmetric duty control, the overall color and illuminance generated in the first and second LED groups 19 and 20 are variable. The total illuminance generated in the first and second LED groups 19 and 20 is variable through the variable frequency of the first and second switches. ) To propose an LED color and illuminance control device.

The present invention can be applied to an LED color and illuminance control device using an asymmetric duty and frequency control method by a person skilled in the art by various modifications, and the scope of technology to be easily modified technically is also seen. It should be recognized as belonging to the scope of the patent rights.

10: input AC power
11: Power factor improvement inductor
12: rectifier diode
13: output terminal capacitor
14: main switch
15: current detection unit
16: first partial pressure resistance
17: second partial pressure resistance
18: first ground
19: first LED group (Group)
20: second LED group (Group)
21: first switch
22: second switch
23: Buffer
24: Inverter
25: Fixed resistance for asymmetric duty control
26: variable resistor for asymmetric duty control
30: input filter
31: rectifier diode unit
32: second ground
35: Fixed resistance for frequency control
36: variable resistor for frequency control
40: main controller of the converter
41: main transformer of flyback converter
42: main transformer of forward-flyback converter
42-1: transformer on flyback winding
41-2: forward winding transformer
45: converter unit
50: constant current circuit part
60: LED color and illuminance control controller
61: first smoothing capacitor
62: coupling inductor
63: second smoothing capacitor
64: third smoothing capacitor
65: dummy resistance
66: first control resistance
67: transistor of the linear regulator
68: second control resistance
69: control capacitor
70: LED color and illuminance control device
71: constant current diode
73: first constant current IC
74: second constant current IC
75: third constant current IC
76: fourth constant current IC
77: 5th constant current IC
78: 6th constant current IC
80: resistance for asymmetric duty control
81: variable voltage source for asymmetric duty control
90: resistance for frequency control
91: variable voltage source for frequency control
BR: Varistor
C1: first capacitor
C2: second capacitor
C3: third capacitor
C4: fourth capacitor
C5: fifth capacitor
C6: 6th capacitor
C7: 7th capacitor
C8: 8th capacitor
C9: 9th capacitor
C10: 10th capacitor
D1: first diode
D2: second diode
D3: third diode
D4: fourth diode
D5: fifth diode
D6: 6th diode
D7: 7th diode (Zener diode)
D8: 8th diode
G1: first gate signal
G2: second gate signal
H: height of the substrate
L: Input AC power supply first terminal
L1: first inductor
L2: second inductor
M: coupled inductor
N: Input AC power 2nd terminal
R1: first resistance
R2: second resistance
R3: third resistor
R4: fourth resistance
R5: fifth resistance
R6: 6th resistance
R7: 7th resistance
R8: 8th resistance
R10: 10th resistance
R11: 11th resistance
R12: 12th resistance
TR: n-type transistor
Vcc: power supply voltage
Vo1: 1st output voltage
Vo2: 2nd output voltage

Claims (10)

In the LED color and illumination control device,
A rectifier diode unit 31 that receives the input AC power supply 10 and rectifies it with DC power;
A converter unit 45 that receives the DC power output from the rectifier diode unit 31 and outputs the first output voltage Vo1;
A constant current circuit unit 50 receiving a first output voltage Vo1 of the converter unit 45 and supplying a second output voltage Vo2 of a constant current;
First and second LED groups 19 and 20 which emit light by receiving the second output voltage Vo2 of the constant current circuit unit 50;
A first switch 21 for controlling the flow of current in the first LED group 19;
A second switch 22 for controlling the flow of current in the second LED group 20;
A controller 60 for controlling LED color and illuminance for controlling an asymmetric duty by the first switch 21 and the second switch 22;
In the asymmetric duty control, when the duty of the first switch increases, the duty of the second switch decreases, and when the duty of the first switch decreases, 2 the duty of the switch increases;
The overall color and illuminance generated in the first and second LED groups 19 and 20 by changing the voltage of the variable voltage source 81 for asymmetric duty control for the asymmetric duty control Variable (可變);
Occurs in the first and second LED groups 19 and 20 by changing the voltage of the variable voltage source 91 for frequency control for controlling the frequency of the first and second switches 21 and 22 The overall illuminance to be varied (可變);
The asymmetric duty control resistor 80 for controlling the asymmetric duty includes a fixed resistor 25 for controlling the asymmetric duty and a variable resistor 26 for controlling the asymmetric duty;
By changing the variable resistor 26 for asymmetric duty control, the total color and illumination generated in the first and second LED groups 19 and 20 are variable, and the frequency is controlled. The frequency control resistor 90 for is composed of a fixed resistor 35 for frequency control and a variable resistor 36 for frequency control;
A transformer 42-1 of a flyback winding and a transformer 42-2 of a forward winding are circuitly arranged in parallel so that the height (H) of the LED color and illumination control device is 2 [cm] or less;
LED color and illuminance control device, characterized in that the total illuminance generated in the first and second LED groups (19, 20) is variable
The method of claim 1,
LED color and illuminance control device, characterized in that receiving the first output voltage Vo1 and supplying a constant current through a linear regulator composed of a transistor 67
The method of claim 1,
The constant current circuit unit is composed of a constant current diode 71 and first,2,3,4,5,6 constant current ICs (73,74,75,76,77,78), and the number of constant current ICs is LED color and illumination control device, characterized in that designed in consideration of the amount of current required by the individual LED elements of the first and second LED groups
The method of claim 1,
The constant current (Constant Current) circuit unit 50 is a LED color and illumination control device, characterized in that consisting of a constant current diode 71 and a plurality of constant current ICs
The method of claim 1,
The switching frequency of the first and second switches 21 and 22 is driven at 30 [kHz] or more in order to prevent a flicker phenomenon in which flicker occurs in the first and second LED groups. LED color and illumination control device
The method of claim 1,
The variable frequency range of the frequency is driven in the range of 30 [kHz] to 200 [kHz], and when the frequency is lowered, the illuminance of the first and second LED groups 19 and 20 increases. And, when the frequency increases, the LED color and illuminance control device, characterized in that the illuminance of the first and second LED groups (Groups 19, 20) decrease.
The method of claim 1,
The first switch 21 and the second switch 22 controlled through the LED color and illuminance control controller 60 operate in complementary to each other.
The method of claim 7,
The LED color and illuminance control controller 60 is an LED color and illuminance control device, characterized in that the duty (Duty) control and frequency (Frequency) control by the frequency control resistor (90)
The method of claim 7,
The LED color and illuminance control controller 60 is an LED color and illuminance control device, characterized in that the duty (Duty) control and frequency (Frequency) control by a variable voltage source 91 for frequency control
The method of claim 1,
LED color and illuminance control device, characterized in that receiving the first output voltage (Vo1) and supplying a constant current using a coupling inductor (62)

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