KR102216376B1 - Led lighting control system - Google Patents

Abstract

The LED lighting control system according to an aspect of the present invention includes an LED module, a voltage detection unit that measures the voltage of the LED module, a control unit that generates a current control signal to the LED module, and is applied to the LED module according to the current control signal. A current adjusting unit that increases or decreases the amount of current that is applied to the LED module when the starting Vf voltage of the LED module or the Vf voltage at the first set time is greater than a set voltage Reduce the current.
Accordingly, the present invention applies a current driving control technology that adjusts (corrects) the amount of change in the luminous flux according to changes in the internal temperature and driving voltage of the light source due to the surrounding environment in a lighting luminaire using an LED module and an LED element as a light source, thereby improving life and The energy saving performance can be improved and maximized.

Description

LED lighting control system {LED LIGHTING CONTROL SYSTEM}

The present invention relates to an LED lighting control system, and more particularly, to an LED lighting control system that controls the amount of change in light flux according to a change in a temperature inside a light source and a driving voltage due to an ambient environment.

Recently, LED devices are in the spotlight as light sources for various lighting devices. LED devices have advantages such as less heat generation, less power consumption, long lifespan, and impact resistance compared to conventional lighting. In addition, since mercury or discharge gas is not used like a fluorescent lamp in the manufacturing process, there is an advantage of not causing environmental pollution.

If the LED element is provided with adequate power supply and heat dissipation means, it can maintain its lighting state without burnout even if it is used for more than 100,000 hours. The light output of all light sources gradually decreases as time goes by, and since 80% of the initial luminous intensity is not easily felt by humans, when evaluated based on this, the lifespan for lighting of the LED element is currently expected to be about 40,000 to 50,000 hours.

However, in the LED lighting, a change in the luminous flux occurs according to a change in the internal temperature of the light source and a driving voltage depending on the surrounding environment. In particular, in winter, Vf is increased to operate, which not only leaks energy, but also deteriorates LEDs and shortens the life of electrical systems such as converters. However, until now, there is no technology to control the initial Vf that always rises during winter.

[Prior Patent Literature] Published Patent Publication No. 10-2013-0107109 (2013.10.01.)

The present invention is to solve the problems of the prior art, and an object of the present invention is to provide an LED lighting control system that realizes energy saving by limiting an excess of an increase in the rated luminous flux according to an increase in the driving voltage of a light source.

The LED lighting control system according to an aspect of the present invention includes an LED module, a voltage detection unit that measures the voltage of the LED module, a control unit that generates a current control signal to the LED module, and is applied to the LED module according to the current control signal. A current adjusting unit that increases or decreases the amount of current that is applied to the LED module when the starting Vf voltage of the LED module or the Vf voltage at the first set time is greater than a set voltage Reduce the current.

In this case, the current adjuster may reduce the applied current when the amount of Vf voltage decrease until the first set time is greater than the first set value.

In addition, the current controller may reduce the applied current when the voltage decrease of Vf per minute until the first set time is linearly formed.

In addition, the first set time may be 10 to 300 seconds.

In addition, the first set value may be 0.020 to 0.035 V/min.

Also, the current controller may apply a normal current when the amount of reduction of the voltage Vf at the second set time is greater than or equal to the second set value.

In addition, the current controller may reduce the applied current by 3 to 5% at the third set time when forming a state in which the power at the third set time after the second set time increases in a stepwise manner.

In addition, the control unit may include a noise determination module that determines signal noise by measuring a Vf value or an increase amount of the Vf value until after the first to third set times and a continuous range time.

The present invention applies a current driving control technology that adjusts (corrects) the amount of change in the luminous flux according to changes in the internal temperature and driving voltage of the light source due to the surrounding environment in a lighting luminaire using an LED module and an LED element as a light source, thereby improving life and energy saving. The performance can be improved and maximized.

1 is a configuration diagram of an LED lighting control system according to an embodiment of the present invention.
2 is a view showing in more detail the configuration of the LED lighting control system according to an embodiment of the present invention.
3 is a circuit diagram of a current control unit in the LED lighting control system according to an embodiment of the present invention.
4 is a graph showing a change in Vf in the LED lighting control system according to an embodiment of the present invention.
5 is a block diagram of an LED lighting control system according to another embodiment of the present invention.
6 is a graph showing power change in an LED lighting control system according to another embodiment of the present invention.
7 is a configuration diagram of an LED lighting control system according to another embodiment of the present invention
8 is a graph for explaining the function of the noise determination module in the LED lighting control system according to another embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily implement them. The present invention will be described in detail by exemplifying specific embodiments in the drawings, since various modifications may be made and various embodiments may be provided. However, this is not intended to limit the present invention to a specific embodiment, it is to be understood to include all changes, equivalents, and substitutes included in the spirit and scope of the present invention.

Terms including ordinal numbers, such as first and second, may be used to describe various elements, but the elements are not limited by the terms. These terms are used only for the purpose of distinguishing one component from another component.

For example, without departing from the scope of the present invention, a first element may be referred to as a second element, and similarly, a second element may be referred to as a first element. The term and/or includes a combination of a plurality of related listed items or any of a plurality of related listed items.

Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs. Terms as defined in a commonly used dictionary should be interpreted as having a meaning consistent with the meaning in the context of the related technology, and should not be interpreted as an ideal or excessively formal meaning unless explicitly defined in this application. Does not.

Hereinafter, an LED lighting control system according to an embodiment of the present invention will be described. 1 is a configuration diagram of an LED lighting control system according to an embodiment of the present invention, Figure 2 is a view showing in more detail the configuration of the LED lighting control system according to an embodiment of the present invention, Figure 3 is It is a circuit diagram of the current control unit in the LED lighting control system according to an embodiment of the present invention, Figure 4 is a graph showing the change of Vf in the LED lighting control system according to an embodiment of the present invention.

Referring to the drawings, the LED lighting control system 101 according to an embodiment of the present invention includes an LED module 10 including a plurality of LED chips, a voltage detector 20 for detecting the Vf voltage of the LED module, the LED module It comprises a control unit 30 for generating a current control signal to (10) and a current control unit 40 for increasing or decreasing the amount of current applied to the LED module 10 according to the current control signal.

The LED module 10 includes a plurality of LED chips to generate light, and the LED module 10 may be formed in various forms such as a straight tube lamp and a bulb lamp. The LED module 10 may include a substrate on which the LED module is mounted, a heat sink, and a cover lens. Meanwhile, the LED module 10 may further include a current conversion chip or a converter that converts AC current into DC current. In the LED lighting control system 102 according to another embodiment to be described later, it is assumed that a converter is included.

The voltage detector 20 detects the starting voltage Vf (V0) of the LED module 10 or the voltage Vf (V1) at the first set time (t1). In this case, the current control unit 40 is applied to the LED module 10 when the starting voltage Vf (V0) of the LED module 10 or the voltage Vf (V1) at the first set time (t1) is greater than the set voltage. Decrease the applied current.

Here, t0 means the point at which lighting starts, t1 means the detection value within 10 to 300 seconds after lighting, and t2 is detected every 60 to 300 seconds after checking t1, but repeats until the normal voltage range is detected. It means the time to become.

That is, in winter, the voltage Vf is increased by approximately 10% from the rated voltage to operate. However, even if the current is reduced by 10%, the amount of light is the same, so energy saving is possible without a decrease in light efficiency.

More specifically, the current controller 40 may reduce the applied current when the Vf voltage decrease amount until the first set time t1 is greater than the first set value. In other words, the Vf voltage of the LED module 10 starts driving and decreases as time passes. In particular, in the winter season, the decrease is larger than when the ambient temperature is at room temperature due to the characteristics of the LED module. Accordingly, the LED lighting control system 101 according to an embodiment of the present invention reduces the applied current by sensing by driving in a subzero condition when the amount of Vf voltage decrease until the first set time t1 is greater than the first set value. As a result, it is possible to significantly reduce the power waste of the LED module without having to equip a separate temperature device.

In this case, the first set value, which is the amount of voltage reduction, is preferably set to 0.020 to 0.035 V/min. Usually, the maximum value of the Vf voltage decrease at 1 to 3 degrees is statistically formed at 0.033 V/min, and even at room temperature, the initial driving Vf voltage may exceed the normal driving voltage, and even at 1 to 3 degrees In consideration of the similarity to the sub-zero conditions, the lower and upper limits of the voltage reduction were set.

On the other hand, it is more preferable that the current adjusting unit 40 decreases the applied current when the Vf voltage decrease per minute until the first set time t1 is linearly formed. When measuring per second, the linear trend of the Vf voltage was not observed, so the most precise measurement was observed per minute or in a unit time of 55 to 75 seconds. In addition, this is because the Vf voltage of the LED module is formed linearly in a sub-zero condition in a time between 1 and 5 minutes. Therefore, in this case, the first setting time (t1) is preferably 10 to 300 seconds, but less than 10 seconds, it is difficult to know the linear formation of the Vf voltage, and after 300 seconds, the Vf voltage of the LED module approaches the normal driving voltage. This is because the leakage prevention effect is remarkably reduced.

In addition, the current controller 40 applies a normal current when the amount of reduction of the Vf voltage at the second set time t2 separated from the first set time t1 is greater than or equal to the second set value. That is, when it is determined that the decrease in Vf at the second set time leads to the normal driving voltage because the rate of change is greater than the set value, the current control unit 40 stops the current control and enters the normal state in advance to minimize the load on the system. can do.

Hereinafter, an LED lighting control system 102 according to another embodiment 102 of the present invention will be described. In the present embodiment 102, the portion for the power detection unit is configured differently from the first embodiment. Figure 5 is a configuration diagram of an LED lighting control system according to another embodiment of the present invention, Figure 6 is a graph showing the power change in the LED lighting control system according to another embodiment of the present invention.

The power detection unit 25 detects the power of the LED lighting control system 102. The power detection unit 25 may be performed by the control unit 30 calculating a detection value of the voltage detection unit 20 in the previous embodiment. At this time, referring to FIG. 4, a section in which the power increases after the third set time t3 again after returning to the normal state after passing the second set time is observed. Here, t3 refers to the time when abnormal power appears again after the normal voltage range is detected.

This occurs due to overpower caused by deterioration of the converter (not shown) after the normal state. Accordingly, the LED lighting control system 102 according to the second embodiment of the present invention increases the applied current by 3 to 5 so as to maintain the luminous flux when the power increases after the third set time t3 after the normal state. % Decrease. Furthermore, since the overpower caused by the converter (not shown) forms a steady state of increasing stepwise, the control unit 30 applies the current controller 40 when at least one step-like rising power is captured. Try to reduce the current.

Hereinafter, the LED lighting control system 102 according to another embodiment 103 of the present invention will be described. 7 is a configuration diagram of an LED lighting control system according to another embodiment of the present invention, Figure 8 is a graph for explaining the function of the noise determination module in the LED lighting control system according to another embodiment of the present invention .

Referring to the drawings, in the LED lighting control system 103 according to another embodiment of the present invention, the control unit 30 further includes a noise determination module 35. The noise determination module 35 performs a function of determining signal noise by measuring an increase in the Vf voltage value or the Vf voltage value until after the first to third set times t1, t2, t3 and the continuous range time. .

At this time, the noise determination module 35 calculates and determines the amount of change in Vf in the first setting time t1 or the second setting time t2. At this time, if there is a possibility that Vf falls below the set voltage, the current must be controlled early to reduce power consumption. However, if the voltage rises again due to noise, the applied current must not return to the normal state. Therefore, the noise determination module 35 shows a normal state, but when the voltage is greater than the set voltage (Fig. 6 (b)) and the decrease amount of Vf is large but rises again after the set time (Fig. 6 (a)) Treated as noise so that the current does not return to normal, so that more consistent control is achieved.

As described above, in the present specification and drawings, a preferred embodiment of the present invention has been disclosed, and although specific terms are used, this is only used in a general meaning to easily explain the technical content of the present invention and to aid understanding of the invention. , It is not intended to limit the scope of the present invention. In addition to the embodiments disclosed herein, it is obvious to those of ordinary skill in the art that other modified examples based on the technical idea of the present invention may be implemented.

101,102,103: LED lighting control system
10: LED module
20: voltage detection unit
25: power detection unit
30: control unit
35: noise judgment module
40: current regulator

Claims (3)

LED module;
A voltage detector measuring the voltage of the LED module;
A control unit generating a current control signal to the LED module; And
A current control unit that increases or decreases the amount of current applied to the LED module according to the current control signal; Including,
The current controller reduces the applied current when the amount of Vf voltage decrease until the first set time is greater than the first set value, but the first set time is 10 to 300 seconds, and the first set value is 0.020 to 0.035 V/min. Is,
The current controller applies a normal current when the amount of Vf voltage decrease until the second set time is equal to or greater than the second set value
The current control unit LED lighting control system, characterized in that to reduce the applied current by 3 to 5% when forming a state in which the power increases in a stepwise shape after the third set time.
The method of claim 1,
The current control unit, the LED lighting control system, characterized in that to reduce the applied current when the voltage decrease Vf per minute until the first set time is linearly formed.

The method of claim 1,
The control unit comprises a noise determination module for determining signal noise by measuring an increase in the Vf value or the Vf value until after the first set time and a continuous range of time.

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