KR20160119385A - System for driving control of LED - Google Patents

Abstract

The present invention relates to a system for controlling driving of an LED. The system includes: a power module for supping driving power to an LED lamp; a sensor module including at least one sensor; an amplifying module for applying a sensing signal; an analog/digital conversion module; an LED driving module; and at least one comparing module. Accordingly, the present invention minimizes the sensing error of the sensor and accurately and rapidly can respond to the motion of an object.

Description

[0001] The present invention relates to an LED drive control system,

The present invention relates to an LED drive control system, and more particularly, to an LED drive control system that adaptively adjusts a reference level for sensing recognition of a sensor according to a hardware deviation caused by a sensor or an amplifier.

The LED lighting device can control dimming as well as simply turn on / off the LED lighting.

Generally, as a part of the reduction of power consumption, the dimming technology which lights the lamp with the maximum power or the saving power lights up the lamp at the maximum output at the time when the flow of the person or the vehicle is high or when the bright light is required, At almost no dawn, the lamps are lighted by saving power so that energy can be saved.

Lighting systems with multiple LED lighting fixtures comprise an automatic dimming system using LED lighting and sensor technology to reduce energy consumption. LED lighting is able to reduce power consumption by more than 50% compared to conventional fluorescent lamps, but it has a longer life than 3 times and can maintain uniform illumination distribution. Can be provided. In addition, LED lighting has a merit that it can develop various smart lighting system by converging IT advanced control system.

The automatic dimming system uses a separate sensor module that detects a vehicle and human movement to change the dimming value when a vehicle or a person is detected.

Especially, in order to reduce the energy consumption of the underground parking lot, technologies and products constituting an automatic dimming system using LED illumination and sensor technology are introduced. However, in the case of such systems and products, a separate installation is required for network construction, To implement the automatic power saving function through simple lighting replacement, there is a problem such as an increase in the unit price and a construction work.

As a prior art document, Korean Patent Laid-Open No. 10-2013-0052256 discloses a technical content of an LED illumination system.

The conventional LED illumination system includes a first sensing unit for sensing movement of an object, a second sensing unit for sensing a sensing roughness of external brightness, an amplifying unit amplifying sensing signals of the first sensing unit and the second sensing unit, A control unit for detecting and supplying at least one sensing signal when the sensing signal is lower than a predetermined reference frequency range among the sensing signals amplified and outputted from the control unit, and an LED light emitting unit receiving the sensing signal from the control unit and including a plurality of LEDs.

Such an LED illumination system can increase the lifetime of the LED while suppressing an increase in power consumption, and can accurately sense the sensing time and the sensing roughness by considering the components used for the LED illumination, thereby improving the LED luminous efficiency.

In most cases, the motion sensor and the illuminance sensor used in the LED illumination system check the change of the digital value according to the analog reference voltage, and then set the reference voltage to a fixed value in order to improve the motion recognition accuracy.

1 is a circuit diagram illustrating a reference voltage providing means applied to a conventional LED illumination system.

Referring to FIG. 1, the amplification module 10 applied to the LED illumination system is provided with a fixed reference voltage (for example, 25 V) through the reference voltage providing means 20. [

In general, the operational amplifier of the amplification module 10 should have an output voltage of 0V when the input voltage is 0V, but has a slight DC output voltage when the input voltage is 0V. The DC output voltage of the operational amplifier is referred to as an output offset voltage, and the DC output offset voltage appears as a result of an input offset current, an input bias current, an input offset voltage, and the like.

When the amplification module 10 uses the fixed reference voltage of the reference voltage supply means 20, a deviation occurs according to the output offset voltage generated in the operational amplifier. As a result, The control unit receiving the signal has a problem that it is difficult to derive an accurate detection result of the sensing signal of the first sensor unit or the second sensor unit due to the deviation according to the output offset voltage or a sensing error may occur.

Accordingly, when a deviation of a circuit due to an output offset voltage of a sensor or an operational amplifier occurs in the LED illumination system, there is a problem that operation recognition or illumination sensing capability of the operation sensor or the illuminance sensor may be degraded.

Korean Patent Publication No. 10-2013-0052256 "LED illumination system"

The present invention relates to a method and apparatus for adjusting a reference level for sensing recognition of a sensor by a hardware deviation caused by a sensor or an amplifier and detecting an ambient illuminance change, Thereby providing a drive control system.

In an embodiment, the LED drive control system includes an LED driving control system for driving at least one LED lighting lamp, the LED driving control system comprising: a power module for supplying driving power to the LED lighting lamp when input power is supplied; A sensor module including at least one sensor for detecting movement or illumination of an object and outputting a detection signal; An amplification module for amplifying and outputting a sensing signal output from the sensor module to a signal of a size capable of being recognized; An analog / digital conversion module for converting the detection signal amplified through the amplification module into a digital signal and outputting the digital signal; A control module for performing a dimming control, a current and a temperature control, and a communication function so as to calculate a driving power applied to the LED lighting lamp by sampling a digital signal inputted from the analog / digital conversion module; An LED driving module for switching the input power according to dimming control of the control module and applying the driving power to at least one or more LED lighting lamps; And at least one comparing module for receiving a DC output offset voltage generated from the sensor module or the amplifying module 130 and adaptively changing a reference level for sensing recognition of the sensor module according to the DC output offset voltage .

The control module includes an algorithm execution unit for counting a digital signal input from the analog / digital conversion module, and performing a deviation correction algorithm for correcting the reference level by comparing the counted value with a predetermined maximum count value; And a storage unit for storing values required for performing the deviation correction algorithm.

In this case, the algorithm executing unit may count a digital signal input from the A / D conversion module during the first set time, and when the count value is less than the maximum count value, calculate a first total count value / A first setting unit setting an average value to a first reference level; A third total count value obtained by adding the count value added to the first total count value to the second total count value and subtracting the average value from the second overall count value when the count value is greater than or equal to the maximum count value, A second setting unit for calculating the third total count value / maximum count value and setting the third total count value / second count level to a second reference level; And a signal determination unit for comparing the first reference level or the second reference level with a count value counted by the digital signal input from the current analog / digital conversion module to determine whether or not the sensor module senses the signal. do.

The sensor module uses any one of a microwave, infrared, and ultrasound method for sensing movement of an object using an antenna, and the antenna is provided with adjustment point means for dispersing the spectrum by lot .

The antenna is a line antenna including a plurality of feed points, and the adjustment point unit adjusts the spectrum by connecting at least one of the feed point and the feed point so that the oscillation frequency is changed.

Meanwhile, the sensor module includes an operation sensor for detecting movement of an object and outputting an operation detection signal, and an illuminance sensor for sensing an illuminance of the surroundings and outputting an illuminance detection signal, The control module receives the illuminance detection signal and recognizes a change in the illuminance of the surrounding illuminance and outputs the illuminance detection signal to the LED illuminator The dimming of the LED illumination lamp is changed from the low state to the high state and the dimming of the LED illumination lamp is changed to the low state when the illumination detection signal is not inputted.

The control module is designed to be compatible with a dimmer that outputs a dimming signal for adjusting the brightness of the LED lighting lamp and a PWM controller that outputs a pulse width modulation control signal of the driving power source for the LED lighting lamp do.

A slave dimmer for receiving a dimming setting signal from the master dimmer; a sensor dimmer for receiving the dimming setting signal from the master dimmer and for transmitting the detection signal to the master dimmer, And a multi-sensor dimmer including an LED.

Wherein the comparison module comprises: a first comparator for receiving and outputting the DC output offset voltage; A second comparator for inputting the DC output offset voltage to the non-inverting terminal and the output signal of the first comparator being input to the inverting terminal; And a plurality of resistors and a capacitor provided between the output line of the second comparator and the inverting terminal of the second comparator.

The LED drive control system of the present invention minimizes the sensing error of the sensor by designing a circuit or performing a deviation correction algorithm so that a reference level for sensing recognition of the sensor is adaptively adjusted by a hardware deviation by a sensor or an amplifier , When a specific LED illumination lamp is turned on due to a motion sensor that senses the movement of the object, the LED illumination lamp of the surrounding LED is sequentially turned on by sensing the change of the ambient illuminance through the LED sensor, thereby promptly and accurately responding to the movement of the object Can have an effect.

In addition, the LED drive control system of the present invention has the effect of further enhancing the sensor detection capability by minimizing the frequency interference by providing adjustment point means for spectrum adjustment to the antenna incorporated in the sensor module.

1 is a circuit diagram illustrating a reference voltage providing means applied to a conventional LED illumination system.
2 is a block diagram illustrating an LED drive control system according to an embodiment of the present invention.
3 is a block diagram illustrating the control module of FIG.
4 is a circuit diagram illustrating the comparison module of FIG.
FIG. 5 is a view showing a printed circuit board illustrating the antenna of the sensor module of FIG. 2. FIG.
6 is a flowchart illustrating a deviation correction algorithm of the LED drive control system according to an embodiment of the present invention.

The description of the present invention is merely an example for structural or functional explanation, and the scope of the present invention should not be construed as being limited by the embodiments described in the text. That is, the embodiments are to be construed as being variously embodied and having various forms, so that the scope of the present invention should be understood to include equivalents capable of realizing technical ideas. Also, the purpose or effect of the present invention should not be construed as limiting the scope of the present invention, since it does not mean that a specific embodiment should include all or only such effect.

Meanwhile, the meaning of the terms described in the present invention should be understood as follows.

The terms "first "," second ", and the like are intended to distinguish one element from another, and the scope of the right should not be limited by these terms. For example, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component.

It is to be understood that when an element is referred to as being "connected" to another element, it may be directly connected to the other element, but there may be other elements in between. On the other hand, when an element is referred to as being "directly connected" to another element, it should be understood that there are no other elements in between. On the other hand, other expressions that describe the relationship between components, such as "between" and "between" or "neighboring to" and "directly adjacent to" should be interpreted as well.

It should be understood that the singular " include "or" have "are to be construed as including a stated feature, number, step, operation, component, It is to be understood that the combination is intended to specify that it does not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

In each step, the identification code (e.g., a, b, c, etc.) is used for convenience of explanation, the identification code does not describe the order of each step, Unless otherwise stated, it may occur differently from the stated order. That is, each step may occur in the same order as described, may be performed substantially concurrently, or may be performed in reverse order.

All terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, unless otherwise defined. Commonly used predefined terms should be interpreted to be consistent with the meanings in the context of the related art and can not be interpreted as having ideal or overly formal meaning unless explicitly defined in the present invention.

2 is a block diagram illustrating an LED drive control system according to an embodiment of the present invention.

2, an LED drive control system 100 for driving at least one LED illumination lamp includes a power module 110, a sensor module 120, an amplification module 130, an analog / digital conversion module 140, A control module 150, an LED driving module 160, and a comparison module 170.

The power module 110 is a SMPS (Switched Mode Power Supply), and supplies driving power to the LED lighting lamp 101 when input power is supplied. The power module 110 is driven by a dimming signal generated by the control module 150 to supply a switching mode power source, and supplies power less than 5 V DC, which can stably use the LED lighting lamp 101.

The sensor module 120 includes an operation sensor for sensing movement of an object or an illuminance sensor for sensing illuminance, and a sensing signal is output by an operation sensor and an illuminance sensor. The motion sensor uses a microwave, a pyroelectric infrared (PIR) method, or an ultrasonic method to detect movement of an object using an antenna.

The amplification module 130 includes at least one operational amplifier and amplifies and outputs the sensed signal output from the sensor module 120 to a signal of a recognizable size.

The analog / digital conversion module 140 converts the sensing signal amplified through the amplification module 130 into a digital signal, and outputs the digital signal to the control module 150.

The control module 150 samples at least one digital signal input from the analog-to-digital conversion module 140 and performs at least one LED lighting lamp 101 by performing a dimming control operation of pulse width modulation so as to calculate driving power applied to the LED lighting lamp. Dimming, current and temperature control, and communication functions.

The control module 150 is designed to be compatible with the dimmer and PWM signals, and supplies a constant current suitable for driving the LED lighting lamp 101. The control module 150 performs a wide range dimming control operation through the dimming decoder.

On the other hand, the dimmer outputs a dimming signal for controlling the brightness of the LED lighting lamp 101 by controlling the amount of current supplied from the power module 110. Such a dimmer can be of various types, including a master dimmer capable of bidirectional communication, a slave dimmer receiving a dimming setting signal from the master dimmer, a dimming setting signal from the master dimmer, and a sensor, Sensor dimmers that transmit, and multi-sensor dimmers that include sensors and LEDs.

The multi-sensor dimmer is installed at the adjacent position between the magnetic group and the neighboring group, and not only transmits the sensing signal sensed by the sensor to the master dimmer of the magnetic group but also to the master dimmer of the neighboring group. Also, the multi-sensor dimmer receives the dimming setting signal from the master dimmer.

Accordingly, the control module 150 adjusts the dimming from the low state to the high state when the movement of the object is sensed through the motion sensor. The control module 150 recognizes the state change of the ambient illuminance when the operation sensing signal is not detected from the operation sensor of the control module 150 but it is detected through the illuminance sensor that the ambient illuminance is higher than a reference value (for example, 200 Hz) , And adjusts dimming of the LED lighting lamp 101 controlled by itself from a low state to a high state.

The PWM controller of the control module 150 performs PWM operation at a cycle of 4 kHz and performs lighting on / off through PWM control of 200 Hz at the time of dimming state change.

In order to compensate the motion sensing or recognition ability of the motion sensor according to the movement speed or size of the object through the compatibility of the dimmer and the PWM controller through the compatibility of the dimmer and the PWM controller, .

That is, when the first LED illumination lamp is turned on by the operation sensor, the dimmer controls the dimming of the first LED illumination lamp, which is managed by itself, at a cycle of 200 Hz and duty (Duty) of 50% 1 The illuminance sensors within a certain range of LED lights detect the signal of 200Hz period through optical communication and output the illuminance detection signal to their dimmer. The dimmer which receives the illuminance detection signal dims the LED illuminance lamp Adjust from low to high.

On the other hand, since the illuminance sensors do not generate the illuminance detection signal in the ambient illuminance of less than 45% duty, the dimmers dim the LED illuminating lamp from the high state to the low state when the illuminance detection signal is no longer inputted.

The LED driving module 160 switches the input power of the power supply module 110 according to the dimming control operation of the control module 150 to apply the driving power to at least one LED lighting lamp 101.

The comparison module 170 receives a DC output offset voltage generated from the sensor module 120 or the amplification module 130 and outputs a reference level for sensing recognition of the sensor module 120 adaptively according to the DC output offset voltage Change.

3 is a block diagram illustrating the control module of FIG.

Referring to FIG. 3, the control module 150 includes an algorithm execution unit 151 and a storage unit 152.

The algorithm executing unit 151 samples and counts the digital signal input from the analog / digital conversion module 140 and outputs the count value C ₁ to a predetermined maximum count value C _max (for example, 10,000 times ) To perform a deviation correction algorithm for correcting the reference level.

The algorithm execution unit 151 includes a first setting unit 151a, a second setting unit 151b, and a signal determination unit 151c.

The first setting unit 151a counts the digital signal input from the A / D conversion module 140 for a first set time (for example, 40 seconds) and outputs the count value C ₁ as the maximum count value C _max ), the _average value of the first total count value C _total1 divided by the current count value C ₁ is set as the first reference level L _ref1 .

A second setting unit (151b) is a count value (C1) up to a count value (C _max) if more, the maximum count value (C _max) of more than a new count value (C _new) a first full count value (C a _total1) after the second output a full count value (C _total2) as an update, and a second full count value (C _total2) mean value (full count value (C _total3) 3 obtained by subtracting the L _ref1) in addition to the third full The value obtained by dividing the count value C _total3 by the maximum count value C _max is set to the second reference level L _ref2 .

The signal determination unit 151c compares the count value C _current obtained by counting the digital signal input from the analog / digital conversion module 140, which is a sensing signal of the sensor module 120, with a first reference level or a second reference level And determines that the C _current is the detection signal of the sensor module 120 when the C _current is equal to or greater than the first reference level or the second reference level.

If the C _current is less than the first reference level or the second reference level, the signal determination unit 151c may determine that the digital signal input through the A / It is not recognized as a signal.

The storage unit 152 stores the maximum count value, the current count value, the total count value, and the values to be updated when performing the deviation correction algorithm.

As another example, the algorithm execution unit 151 may perform an automatic check algorithm for the motion sensor or the illumination sensor. At this time, the automatic check algorithm is an algorithm for checking whether the function of each sensor is normal. In particular, in the case of the operation sensor, if the sensor continues to oscillate due to malfunction, a detection error occurs. . The automatic check algorithm can automatically check the function of the motion sensor even when the worker is absent during mass production, thereby improving productivity, system performance and quality.

4 is a circuit diagram illustrating the comparison module of FIG.

4, the comparison module 170 receives the signal of the sensor module 120, that is, the output offset voltage, from the non-inverting (+) terminal of the first comparator U6A, The output offset voltage is input to the inverting terminal and the output signal of the first comparator U6A is input to the inverting (-) terminal.

The resistors of R231, R232 and R233 connected between the inverting terminal and the output line of the second comparator U6B, the resistors of the capacitor C226 and the resistor R13 are used to adaptively change the output voltage of the sensor module 120 The reference level for sensing recognition can be adjusted. At this time, the resistances of R231, R232, and R233 are connected in parallel.

At this time, if the reference level is changed, the sensing ability of the sensor module 120 also changes. The sensing level of the sensor module 120 is not changed in any environment by adaptively adjusting the reference level according to the hardware deviation.

Therefore, it is possible to minimize the deviation generated in the sensor module 120 or the amplification module 130, thereby reducing the detection error of the sensor module 120 and improving the adaptability to the mass production process of the sensor or the change of the surrounding environment of the sensor .

FIG. 5 is a view showing a printed circuit board illustrating the antenna of the sensor module of FIG. 2. FIG.

5, when the operation sensor of the sensor module 120 uses the microwave method, the antenna 121 is provided with adjustment point means 121a for spectral dispersion for each lot in order to minimize the interference of microwaves. And 121b.

At this time, the antenna 121 is a line antenna including a plurality of feed points, and the adjustment point means 121a and 121b connect the feed point and the feed point to each other so that the oscillation frequency is changed to adjust the spectrum.

When the feeding points connected to the adjustment point means 121a and 121b are changed, the connection interval is changed, and the oscillation frequency of the microwave is changed, so that mutual interference can be reduced.

6 is a flowchart illustrating a deviation correction algorithm of the LED drive control system according to an embodiment of the present invention.

6, when the analog / digital conversion module 140 is turned on, the deviation correction algorithm sets the sampling time of the analog / digital conversion module 140 as the first set time, Value and sets the maximum count value C _max to approximately 10,000. (S1, S2)

The deviation correction algorithm counts the digital signal input from the analog / digital conversion module 140 and obtains an average value using Equation 1 when the count value C ₁ is less than the maximum count value C _max , Is set to the first reference level L _ref1 (S3, S4, S5)

The deviation correction algorithm is set to the second reference level L _ref2 using Equation (2) when the count value C1 is equal to or greater than the maximum count value C _max . (S4, S6)

The deviation correction algorithm compares the first reference level L _ref1 when the count value C _current counting the digital signal input from the current analog / digital conversion module 140 is less than the maximum count value C _max , When the C _current is equal to or greater than the maximum count value C _max , the second reference level L _ref2 is compared. (S7)

The deviation correction algorithm recognizes the deviation as the sensing signal of the sensor module 120 when C _current is equal to or greater than the first reference level or the second reference level, but if the C _current is less than the first reference level or the second reference level, The digital signal input through the conversion module 140 is not recognized as a signal due to the sensing operation of the sensor module 120. (S8, S9)

As described above, the LED drive control system 100 according to the embodiment of the present invention can detect the sensor module 120 adaptively to the circuit deviation using the deviation correction algorithm of the comparison module 170 or the control module 150 The reference level for recognition can be adjusted.

That is, the LED drive control system 100 can minimize the detection error of the sensor module 120 due to the output offset voltage of the sensor module 120 through the comparison module 170, 120 and the amplification module 130 can be minimized.

Accordingly, the LED drive control system 100 can perform the reference level adjustment through the comparison module 170 as a basic operation, and selectively perform the reference level adjustment through the deviation correction algorithm. The LED drive control system 100 may perform both the comparison module 170 and the reference level adjustment operation by the deviation correction algorithm to improve the accuracy and accuracy of the sensor module 120. [

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the present invention as defined by the following claims It can be understood that

110: power supply module 120: sensor module
130: amplification module 140: analog / digital conversion module
150: Control module 160: LED driving module
170: comparison module 121: antenna

Claims (9)

An LED drive control system for driving at least one LED lighting lamp,
A power module for supplying driving power to the LED lighting lamp when input power is supplied;
A sensor module including at least one sensor for detecting movement or illumination of an object and outputting a detection signal;
An amplification module for amplifying and outputting a sensing signal output from the sensor module to a signal of a size capable of being recognized;
An analog / digital conversion module for converting the detection signal amplified through the amplification module into a digital signal and outputting the digital signal;
A control module for performing a dimming control, a current and a temperature control, and a communication function so as to calculate a driving power applied to the LED lighting lamp by sampling a digital signal inputted from the analog / digital conversion module;
An LED driving module for switching the input power according to dimming control of the control module and applying the driving power to at least one or more LED lighting lamps; And
And at least one comparing module for receiving a DC output offset voltage generated from the sensor module or the amplifying module 130 and adaptively changing a reference level for sensing recognition of the sensor module according to the DC output offset voltage Wherein the LED driving control system comprises:
The method according to claim 1,
The control module includes:
An algorithm execution unit for counting digital signals input from the analog / digital conversion module, and performing a deviation correction algorithm for correcting the reference level by comparing the counted value with a predetermined maximum count value; And
And a storage unit for storing values required for performing the deviation correction algorithm.
3. The method of claim 2,
The algorithm executing unit includes:
Digital conversion module during the first set time, and when the count value is less than the maximum count value, calculating an average value of the first total count value / current count value as a first reference level A second setting unit for setting the first setting unit;
A third total count value obtained by adding the count value added to the first total count value to the second total count value and subtracting the average value from the second overall count value when the count value is greater than or equal to the maximum count value, A second setting unit for calculating the third total count value / maximum count value and setting the third total count value / second count level to a second reference level; And
And a signal determination unit for comparing the first reference level or the second reference level with a count value counted by the digital signal input from the current analog / digital conversion module to determine whether or not the sensor module senses the signal. LED drive control system.
The method according to claim 1,
The sensor module uses any one of a microwave, infrared or ultrasonic method for detecting movement of an object using an antenna,
Wherein the antenna comprises adjustment point means for spectral dispersion for each lot.
5. The method of claim 4,
Wherein the antenna is a line antenna including a plurality of feeding points,
Wherein the adjustment point unit adjusts the spectrum by connecting at least one of the feeding point and the feeding point so that the oscillation frequency is changed.
The method according to claim 1,
Wherein the sensor module includes an operation sensor for detecting movement of an object and outputting an operation detection signal, and an illuminance sensor for sensing an illuminance of the surroundings and outputting an illuminance detection signal,
Wherein the illuminance sensor outputs an illuminance detection signal when the ambient illuminance is equal to or greater than a reference value in a state in which an operation detection signal of the operation sensor is not detected,
The control module receives the illumination sensing signal and recognizes the state change of the ambient illuminance to adjust the dimming of the LED lighting lamp controlled by the control module to a high state from a low state. When the illumination sensing signal is not inputted, To a low state.
The method according to claim 1,
The control module is designed to be compatible with a dimmer that outputs a dimming signal for adjusting the brightness of the LED lighting lamp and a PWM controller that outputs a pulse width modulation control signal of the driving power source for the LED lighting lamp An LED drive control system.
8. The method of claim 7,
A slave dimmer for receiving a dimming setting signal from the master dimmer; a sensor dimmer for receiving the dimming setting signal from the master dimmer and for transmitting the detection signal to the master dimmer, And a multi-sensor dimmer including an LED.
The method according to claim 1,
Wherein the comparison module comprises:
A first comparator for receiving and outputting the DC output offset voltage;
A second comparator for inputting the DC output offset voltage to the non-inverting terminal and the output signal of the first comparator being input to the inverting terminal; And
And a plurality of resistors and capacitors provided between the output line of the second comparator and the inverting terminal of the second comparator.

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