WO2014073911A1 - Dispositif et procédé de commande de fonctionnement et de gradation d'une del à courant alternatif - Google Patents

Dispositif et procédé de commande de fonctionnement et de gradation d'une del à courant alternatif Download PDF

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Publication number
WO2014073911A1
WO2014073911A1 PCT/KR2013/010144 KR2013010144W WO2014073911A1 WO 2014073911 A1 WO2014073911 A1 WO 2014073911A1 KR 2013010144 W KR2013010144 W KR 2013010144W WO 2014073911 A1 WO2014073911 A1 WO 2014073911A1
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Prior art keywords
dimming
led
driving
signal
input voltage
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PCT/KR2013/010144
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English (en)
Korean (ko)
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정혜만
강현구
한상욱
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서울반도체 주식회사
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Publication of WO2014073911A1 publication Critical patent/WO2014073911A1/fr

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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/10—Controlling the intensity of the light
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/32—Pulse-control circuits
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/40—Details of LED load circuits
    • H05B45/44—Details of LED load circuits with an active control inside an LED matrix
    • H05B45/48—Details of LED load circuits with an active control inside an LED matrix having LEDs organised in strings and incorporating parallel shunting devices
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/10—Controlling the light source
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/32—Pulse-control circuits
    • H05B45/325—Pulse-width modulation [PWM]
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/345—Current stabilisation; Maintaining constant current
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection

Definitions

  • the present invention relates to an AC light emitting diode driving and dimming control apparatus and a method thereof, and more particularly, to an AC light emitting diode driving and dimming which can control the light output of the AC light emitting diode light source based on the entire lighting of the LED. It relates to a control device and a method thereof.
  • Dimmer refers to a device for adjusting or changing the illuminance of a lamp, and a phase control dimmer using a triac switch or a field effect transistor (FET) switch is widely used.
  • FET field effect transistor
  • FIG. 1 An example of an alternating light emitting diode (LED) lighting system with a conventional phase controlled dimmer is shown in FIG. 1. 1 is shown in the form of adding a phase control dimmer to a conventional AC LED lighting system using an LED multiphase driving circuit of US Pat. No. 7,081,722.
  • LED alternating light emitting diode
  • a conventional AC LED lighting system includes a phase control dimmer 2 and an AC LED module 4, and the AC LED module 4 includes a rectifier and a plurality of LEDs.
  • a plurality of driving switches PS 1 , PS 2 ,... For driving the groups (Group 1, Group 2, ..., Group n) (n is an arbitrary natural number) and each LED group independently or sequentially. PS n ).
  • Each LED group has one or more light emitting diode elements, and when there are a plurality of light emitting diode elements, they are connected in series or in parallel with each other.
  • the phase of the input AC voltage V AC is adjusted through the dimmer 2 connected to the input of the rectifier in order to adjust the light output of the AC LED module 4 to a desired intensity.
  • Configured to control That is, in the AC LED lighting system, according to the height of the dimming level in the phase control dimmer 2, a part of the phase of the input periodic voltage is removed through the delay operation of the switching element in the dimmer 2, thereby The light output of the plurality of LED groups is controlled corresponding to the remaining phase section.
  • the AC LED illumination system has a delay operation in the dimmer in the periodic waveform of the input AC voltage from the phase control dimmer 2 operating in the forward or reverse phase control scheme (S OFF).
  • Step-by-step driving current for receiving the output voltage (corresponding to the S ON section) with the leading edge or the trailing edge removed, and following the waveform of the received output voltage (corresponding to the section).
  • the light output (LED light output) of the plurality of LED groups is controlled in accordance with the height of the dimming level in the dimmer 2.
  • any second LED group of the plurality of LED groups when any second LED group of the plurality of LED groups is turned on so that the LED current follows the waveform of the output voltage of the dimmer 2, it is turned on at the point immediately before it. Sequentially driving the plurality of LED groups in a manner to turn off the first LED group reduces power loss of the system.
  • the dimming control characteristic is better than a dimmer using a triac switch, but has a disadvantage in that the dimming range is narrow.
  • the AC LED lighting system there is a disadvantage that partial lighting occurs due to the waveform of the output voltage of the phase control dimmer.
  • the operation period of the AC LED is from the maximum value of the input period voltage to the zero potential of the period voltage, in the case of the forward phase control type dimmer from the maximum value point of the input period voltage
  • the LED groups start to turn off step by step, and therefore, in the AC LED module 4, there is a disadvantage that a specific LED group is turned off first so that a problem such as local dimming occurs. .
  • the LED group in the LED light source unit gradually increases from the zero potential point of the input periodic voltage to the maximum value of the voltage.
  • a specific LED group starts to light up first, and therefore, a specific LED group having at least one light emitting diode is frequently turned on first in the LED light source unit, which causes a problem such as a partial lighting phenomenon.
  • FIG. 4 The above-described partial lighting phenomenon of the prior art is shown in FIG. 4 according to an example of the height of the dimming level.
  • the four light emitting diodes D1, D2, D3, and D4 connected to each other in series may correspond to four LED groups among the plurality of LED groups of FIG. 1.
  • the first dimming level DL1 which is the lowest illuminance level among four illuminance levels, is set, and the dimmer 2 phases the input AC voltage according to the set first dimming level.
  • the driving control signal is applied to the first driving switch PS 1 among the plurality of driving switches connected in series with the cathodes of the respective light emitting diodes, the first light emitting diode ( Only D1) lights up.
  • the driving control signal is applied to the second driving switch PS 2 at the second dimming level DL2
  • the first light emitting diode D1 is first turned on in the first sub period SP1 of the periodic voltage. Subsequently, the first and second light emitting diodes D1 and D2 are turned on in the second sub period SP2.
  • the driving control signal is applied to the third driving switch (not shown) at the third dimming level DL3
  • the first light emitting diode D1 is turned on in the first sub-section SP1 of the periodic voltage waveform, and the first sub-LED is turned on.
  • the first and second light emitting diodes D1 and D2 are turned on in the second sub-section SP2 following the section, and the first to third light-emitting diodes D1 in the third sub-section SP3 following the second sub-section. , D2, D3) light up.
  • the driving control signal is applied to the fourth driving switch (not shown) at the fourth dimming level DL3, the first light emitting diode D1 is turned on in the first sub-section SP1 of the periodic voltage, and the first light emitting diode D1 is turned on.
  • the first and second light emitting diodes D1 and D2 are turned on in the second sub-section SP2 following the sub-section, and the first to third light emitting diodes (3) in the third sub-section SP3 following the second sub-section SP3.
  • D1, D2, and D3 are turned on, and the first to fourth light emitting diodes D1, D2, D3, and D4 are turned on in the fourth sub-section SP4 following the third sub-section.
  • the present invention is to solve the above problems, AC light emitting diode (LED) driving and dimming control apparatus and method according to the present invention, LED by controlling the light output of the LED light source unit on the basis of the overall lighting of the LED It aims at eliminating the partial lighting phenomenon in a light source part and improving lifetime.
  • LED AC light emitting diode
  • An AC LED driving and dimming control apparatus and method thereof by controlling the light output of the LED light source unit in a multiphase or sequential driving method based on the entire lighting of the light emitting diode in the LED light source unit Another aim is to eliminate partial lighting and improve system efficiency and lifespan.
  • an AC light emitting diode (LED) driving and dimming control device includes: an input voltage receiving unit receiving an input voltage whose voltage varies periodically with time; A signal for adjusting the length of a light emitting section, which is a time that an LED light source having a plurality of light emitting diode (LED) groups emits light according to a high level of dimming level, and is generated at a reference time point when an input voltage has a maximum value.
  • a dimming control unit for generating a dimming signal in which the width of the square wave signal is extended or reduced in accordance with the height of the dimming level by adjusting the positions of the rising edge and the falling edge of the square wave signal at both sides of the reference point.
  • LED emission control unit for controlling the driving and dimming of the LED light source unit to reduce the number of LED groups to emit light as the number of or increases the size of the input voltage is characterized in that it comprises a.
  • the dimming control unit the left and right edges of the square wave signal is adjusted to the left and right symmetrically relative to the reference point position
  • a dimming signal having an extended or reduced width of the square wave signal may be generated according to a high or low dimming level.
  • the dimming control unit is located on both sides of the reference point with respect to the reference point with respect to the position of the rising edge and the falling edge of the square wave signal. By adjusting it to be located at a different distance, it is characterized in that for generating a dimming signal, the width of the square wave signal is extended or reduced in accordance with the height of the dimming level.
  • the dimming control unit the zero point detection unit for detecting the zero point of the input voltage;
  • a phase detector configured to detect a reference time point at which the input voltage has a maximum value based on the zero point;
  • a dimming signal generating unit for generating a dimming signal extending by a predetermined width to both sides of the reference point of view based on the elevation of the dimming level of the rising edge and the falling edge of the square wave pulse.
  • the LED light emission control unit PWM (Pulse Width Modulation) controller for outputting a drive control signal for sequentially driving a plurality of LED groups based on the dimming signal Characterized in having a.
  • PWM Pulse Width Modulation
  • the AC LED driving and dimming control apparatus further includes a plurality of driving switches for controlling the current flowing through the plurality of LED groups, respectively.
  • each drive switch connected in series to each LED group is characterized in that the selective operation in response to the drive control signal.
  • the alternating current LED driving and dimming control apparatus further includes a protection circuit unit which detects a current flowing through the driving switch and provides it to the LED emission control unit. It is done.
  • the LED light emission control unit is characterized in that the constant current drive a plurality of LED groups based on the current detection signal from the protection circuit.
  • the AC LED driving and dimming control device further generates a dimming reference signal for adjusting the height of the dimming level and supplies the dimming interface to the dimming control unit. It is characterized by including.
  • the input voltage receiving unit is characterized by comprising a rectifying unit for rectifying the input AC power to output the input voltage.
  • An AC LED driving and dimming control method comprises: a first step of receiving an input voltage whose voltage varies periodically with time; Generating a square wave signal at a reference time point at which the input voltage has a maximum value; Generating a dimming signal in which the width of the square wave signal is extended or reduced in accordance with the height of the dimming level by adjusting the positions of the rising edge and the falling edge of the square wave signal at both sides of the reference time point; And controlling the driving and dimming of the ED light source by a driving voltage or a driving current according to a limited input voltage by applying a driving control signal to the LED light source having a plurality of LED groups based on the dimming signal. And the LED light source unit operates to increase the number of LED groups emitting light as the magnitude of the input voltage increases under the dimming level or to decrease the number of LED groups emitting light as the magnitude of the input voltage decreases. .
  • the third step the position of the leading edge (raising edge) and the trailing edge (falling edge) of the square wave signal symmetrically with respect to the reference point
  • the width of the square wave signal is extended or reduced in accordance with the height of the dimming level.
  • the third step the reference point both sides of the reference point with respect to the position of the rising edge and the falling edge of the square wave signal
  • the width of the square wave signal is extended or reduced in accordance with the height of the dimming level to generate a dimming signal.
  • the LED light source unit is driven by applying a PWM (Pulse Width Modulation) driving control signal for sequentially driving a plurality of LED groups. And controlling dimming.
  • PWM Pulse Width Modulation
  • the alternating current LED driving and dimming control method protects the driving switch driven on or off by a driving control signal and presets the driving current of the LED light source unit. Detecting current flowing through the drive switch to limit the range.
  • the AC LED driving and dimming control method further includes, before the third step, receiving a dimming reference signal indicating the height of the dimming level from the dimming interface. It is characterized by including.
  • the first step is characterized in that for receiving the input voltage by rectifying the external input AC power.
  • the AC light emitting diode (LED) driving and dimming control device and the method thereof according to the present invention control the light output of the AC LED light source unit based on the entire lighting of the light emitting diodes, so that the lighting device, the backlight unit, or the like is controlled. It provides the effect of eliminating partial lighting phenomenon in the AC LED light source used and improving the life of the AC LED light source and the lighting system.
  • the AC LED light source unit by controlling the light output of the AC LED light source unit in a multiphase or sequential driving method based on the entire lighting of the light emitting diodes Eliminates partial lighting in the system, increases the efficiency of the device, and improves the life of the AC LED light source and lighting system.
  • FIG. 1 is a schematic block diagram of an example of a light emitting diode (LED) lighting system with a conventional phase controlled dimmer.
  • LED light emitting diode
  • FIG. 2 is an operation timing diagram of the LED lighting system of FIG.
  • FIG. 3 is another operational timing diagram of the LED lighting system of FIG.
  • FIG. 4 is a view showing the light output of the LED light source according to the dimming level of the LED lighting system of FIG.
  • FIG. 5 is a block diagram of an AC LED driving and dimming control device according to an embodiment of the present invention.
  • FIG. 6 is a schematic block diagram of a dimming control unit of the AC LED driving and dimming control device of FIG.
  • FIG. 7 is a flow chart of the AC LED driving and dimming control method according to an embodiment of the present invention.
  • FIG. 8 to 12 are views illustrating the AC LED driving and dimming control method of FIG. 7 according to dimming levels.
  • FIG. 13 is a view showing an AC LED driving and dimming control method according to another embodiment of the present invention according to the dimming level.
  • FIG. 5 is a block diagram of an AC LED driving and dimming control device according to an embodiment of the present invention.
  • the AC LED driving and dimming control device 10 includes an input voltage receiving unit, a dimming control unit 12, an LED emission control unit 13, a switching unit 14, and a protection circuit unit 15. It is provided.
  • the input voltage receiver is a means or a component for receiving an input voltage Vin and an input current which are connected in series with an input AC power supply 6 supplied to an AC LED drive and a dimming control device.
  • the input voltage receiving unit includes a rectifying unit 16 for full-wave rectifying the input AC power supply 6 to output the input voltage Vin and the input current.
  • the rectifier 16 may be implemented as a bridge diode or the like.
  • the input voltage receiver may include an input terminal 11 to which an AC power source 6 is applied.
  • the input voltage receiver may include at least one protection circuit for removing noise on an input AC power source or an input power source rectifying the input AC power source, removing a surge voltage, and removing an electronic interference.
  • the dimming control unit 12 generates a dimming signal for adjusting the length of the light emitting section of the LED light source unit according to the high and low (high and low) of the dimming level, and outputs the generated dimming signal to the LED emission control unit 13.
  • the dimming control unit 12 according to the present exemplary embodiment generates a square wave signal at a reference time point at which the periodic voltage of the input voltage has a maximum value, and drives and modulates the LED light source unit 20 based on the generated square wave signal. By controlling, the light output of the LED light source unit 20 is controlled on the basis that the entire light emitting diode of the LED light source unit 20 is turned on.
  • the dimming control unit 12 is a square wave signal according to the height of the dimming level when the rising edge and the falling edge of the square wave signal respectively correspond to the dimming on time and dimming off time of the dimming level.
  • the dimming signal may be generated such that the width of the light is extended or reduced symmetrically from both sides of the reference time point with respect to the reference time point.
  • the dimming control unit 12 when the leading edge and the trailing edge of the square wave signal respectively correspond to the dimming lighting time and dimming off time of the dimming level, the width of the square wave signal based on the height of the dimming level is referred to As a result, dimming signals may be generated to extend or contract to different widths at both sides of the reference point.
  • the dimming control unit 12 at the dimming control of the LED light source unit 20 is the lowest level at the maximum value of the input voltage corresponding to the rated input voltage (driving voltage, etc.) of the LED light source unit 20 Since the dimming signal is generated, the light emission of the LED light source unit 20 is controlled based on the lighting of the entire LED of the LED light source unit 20 regardless of the height of the dimming level.
  • the above-described dimming signal may be, for example, a signal for designating a predetermined dimming level according to an input signal (dimming reference signal, etc.) at the dimming interface (see 17 in FIG. 3).
  • the input signal at the dimming interface may be an analog or digital signal and may also be a wired or wireless signal.
  • the dimming control unit 12 may include an analog-to-digital converter, a communication interface, and the like, but since the analog-to-digital converter or communication interface that performs such signal processing is well known, detailed description thereof will be omitted.
  • the dimming signal may be a signal including dimming data previously stored in a storage unit (not shown) such as a memory device mounted on the dimming controller 12 or the AC LED driving and dimming control device 10.
  • the dimming data may store a plurality of dimming levels for specifying different brightness of the lighting system and execution conditions (time, person detection, etc.) for each dimming level.
  • the dimming control unit 12 may read the dimming data stored in the storage unit according to a preset time, and generate a specific dimming signal according to the height of the dimming level included in the read dimming data.
  • the LED emission control unit 13 applies the driving control signal to the LED light source unit 20 in response to the dimming signal from the dimming control unit 12 to input the input voltage Vin supplied to the LED light source unit 20 according to the height of the dimming level. At least one of the driving voltage and the driving current according to the input voltage is limited, and the driving and dimming of the LED light source unit 20 having the plurality of LED groups are simultaneously controlled by this limitation.
  • the LED light emission control unit 13 may increase the number of LED groups emitting light as the size of the input voltage Vin increases or decrease the number of LED groups emitting light as the size of the input voltage Vin decreases.
  • the driving and dimming of the LED light source unit 20 is controlled.
  • the LED emission control unit 13 may include a PWM (Pulse Width Modulation) controller for outputting a driving control signal for sequentially driving the plurality of LED groups based on the dimming signal. Structures or methods for sequential driving of a plurality of LED groups are described in detail in US Pat. No. 7,081,722 and the like, and thus detailed descriptions thereof will be omitted.
  • the switching unit 14 includes a semiconductor switch that is turned on or off in response to application of a drive control signal from the LED emission control unit 13.
  • the semiconductor switch may be implemented with an n-channel MOSFET or the like.
  • the driving voltage and the driving current supplied to the LED light source unit 20 by the operation of the switching unit 14 may be limited according to the height of the dimming level.
  • the switching unit 14 according to the present embodiment includes a plurality of driving switches (PS 1 and PS 2 of FIG. 1) connected to the cathode side of each LED group to sequentially drive the plurality of LED groups of the LED light source unit 20. , PS n ).
  • the protection circuit unit 15 detects the current flowing through the LED light source unit 20 and the voltage across the resistor R1, and controls the LED current to be controlled based on the detected current value and the voltage value to uniformly emit light of the LED light source unit 20.
  • the light source unit 20 and the switching unit 14 are protected from abnormal current.
  • the resistor R1 is connected in series between the driving switch Q1 and neutral or ground.
  • the driving switch is formed of a metal oxide semiconductor field effect transistor (MOSFET)
  • the protection circuit unit 15 is commonly connected to the second terminal of the driving switch (for example, the source of the n-channel MOSFET) and one terminal of the resistor R1.
  • the LED current flowing through the driving switch Q1 may be detected, and the detected LED current value may be applied to the driving controller 124.
  • the protection circuit unit 15 may be implemented as a current sink for driving a constant current of the LED light source unit 20.
  • the protection circuit unit 15 uses an operational amplifier to supply a voltage between the second terminal of the drive switch and the ground (or neutral), that is, the voltage across the resistor R1, to a predetermined reference voltage (drive control signal, etc.). Constant current control of the LED current is equal to
  • the AC LED driving and dimming control device 10 may further include a control power supply unit 17 and the like.
  • the control power supply 17 is connected in series to the output terminal of the rectifier 16 to supply the internal power required for the AC LED drive and the dimming control device 10 or to generate a synchronization signal to control the dimming control unit 12 or the LED emission control unit 13. Can be implemented.
  • Such a control power supply 17 is already well known in the art, so a detailed description thereof will be omitted.
  • the LED light source unit 20 includes a plurality of light emitting diodes and a rated driving voltage corresponding to the input voltage.
  • the LED light source unit 20 may include a plurality of LED packages or LED strings connected in series or in parallel with each other.
  • the LED light source unit 20 may be referred to as an LED array.
  • FIG. 6 is a schematic block diagram of a dimming control unit of the AC LED driving and dimming control device of FIG. 5.
  • the dimming controller 12 includes a zero point detector 121, a phase detector 122, and a dimming signal generator 123.
  • the zero point detector 121 detects a zero point or zero potential of the input voltage Vin.
  • the zero crossing detector 121 detects a time point at which the input voltage is 0V.
  • the zero detection unit 121 is a means for detecting a phase (or a time point) at which a component value of an input voltage obtained by full-wave rectifying an AC input voltage having a sine wave form or performing a function corresponding thereto. Implemented as negative.
  • the phase detector 122 detects a reference time point that is a time point at which the input voltage exhibits a maximum value based on the zero point detection signal from the zero point detector 121.
  • the zero detection signal is a signal including phase or viewpoint information on the zero or zero potential of the input voltage.
  • the reference time point may be detected by calculating an intermediate time point between two adjacent zero points or two time points for the two zero points.
  • phase detector 122 determines a current pulse signal output from the AC LED driving and phase control apparatus.
  • the pulse signal (synchronization signal, etc.) may be generated by the control voltage supply unit 16 and supplied to the AC LED drive and phase control device.
  • the dimming signal generator 123 generates a square wave pulse based on the reference time point from the phase detector 122 and the dimming reference signal from the dimming interface 17.
  • the dimming signal generator 123 extends the rising edge and the falling edge of the square wave pulse to both sides of the reference point by a predetermined width based on the reference point having the maximum input voltage.
  • a dimming signal is generated, and the generated dimming signal is output to the LED emission controller.
  • the dimming signal generator 123 outputs a synchronous signal from an input voltage, outputs a clock signal of a predetermined period using the output synchronous signal, counts a clock signal, and counts binary data (count clock). Number) and control the operating frequency of the oscillator according to the count clock number.
  • the dimming signal generating unit 123 determines the enable period (corresponding to the light emitting period) of the square wave signal (corresponding to the dimming signal) using the count clock number, and controls the driving of the LED light emitting controller during the determined enable period. It can be implemented to output a signal.
  • the driving control signal may be applied to the control terminal of the driving switch of the switching unit 14 or the operational amplifier of the protection circuit unit 15.
  • the above-described dimming signal generator 123 may be implemented as the phase shift PWM controller 130 together with the LED emission controller (see 13 of FIG. 5).
  • AC LED driving and dimming control apparatus may have a dimming interface 18 depending on the implementation.
  • the dimming interface 18 corresponds to a user device (dimmer) for adjusting the illuminance of the LED light source unit 20 and may have an analog, digital, or a combination thereof in which an output value thereof changes according to a user input. have.
  • the dimming interface 18 may include a dimmer structure such as a dial method, a button method, and a touch method for controlling the light output of the LED light source unit 20.
  • the dimming interface 18 can be implemented using various existing structures, for example, a load including a resistor; Loads including resistors and capacitors; Loads including resistors and inductors; And a load including a resistor, a capacitor, and an inductor.
  • the dimming interface 18 may be installed to be exposed to the outside of the AC LED driving and dimming control device or may be installed as a separate device independent of the AC LED driving and dimming control device.
  • the dimming interface 18 may be implemented as a dimmer coupled to an LED module or LED lamp including the LED light source unit 20 and the AC LED driving and dimming control device.
  • the dimming interface 17 may be installed integrally with the LED lamp in the housing of the LED lamp or may be separately installed at various locations such as a building wall regardless of the type or structure of the LED lamp, depending on the implementation.
  • FIG. 7 is a flow chart of the AC LED driving and dimming control method according to an embodiment of the present invention.
  • the AC LED driving and dimming control method first receives an input voltage whose voltage varies periodically depending on time (S71).
  • the input voltage is preferably a voltage obtained by rectifying the input AC voltage.
  • a square wave pulse is generated at the reference time point at which the input voltage has the maximum value (S72).
  • Generating the square wave pulse at the reference time is preferably to generate the square wave pulse so that the center of the width of the square wave pulse is located at the reference time.
  • the present invention is not limited to such a configuration, and generates a square wave pulse so that the rising edge of the square wave pulse is located at the reference time point, or the square wave is positioned so that the falling edge of the square wave pulse is located at the reference time point. Generating pulses.
  • the dimming signal having an extended or reduced width of the square wave signal is generated according to the height of the dimming level (S73). Adjusting the position of the leading edge and the trailing edge of the square wave signal extends the positions of the leading edge and / or trailing edge of the square wave signal from both sides of the reference point by a predetermined width according to the height of the dimming level in the square wave signal generated at the reference point. Responds to shrinking.
  • the dimming signal may correspond to a signal for adjusting a length of a light emitting section, which is a time at which an LED light source unit having a plurality of light emitting diode (LED) groups emits light.
  • a driving control signal for limiting at least one of the input voltage, the driving voltage according to the input voltage, and the driving current based on the dimming signal is applied to the LED light source unit to emit light as the magnitude of the input voltage increases under the dimming level.
  • driving and dimming of the LED light source unit is controlled to reduce the number of LED groups emitting light (S74).
  • the present embodiment it is possible to control the dimming of the LED light source unit based on the light emission of the entire LED group while driving control of the plurality of LED groups of the LED light source unit in a sequential driving manner.
  • FIG. 8 to 12 are views illustrating the AC LED driving and dimming control method of FIG. 7 according to dimming levels.
  • the AC LED driving and dimming control device has a maximum input voltage Vin.
  • a square wave signal is generated at the reference time point t0, which is a time point having a value, and the LED light source unit is driven and dimmed based on the generated square wave signal.
  • the square wave signal may be used as the dimming signal RS1.
  • the square wave signal may be used to generate the dimming signal RS1 whose length is extended or reduced by a predetermined width.
  • the driving control signal based on the dimming signal RS1 when the driving control signal based on the dimming signal RS1 is applied to the fourth driving switch of the LED light source unit, the driving voltage and the driving current I LED according to the input voltage Vin are specified in the sub-section of the input periodic voltage. It is supplied to the LED light source unit during t1 to t2, and the entire first to fourth LEDs D1, D2, D3, and D4 are turned on substantially simultaneously during the specific sub-section.
  • the specific sub section corresponds to the first sub section SP1 and also corresponds to the width section of the square wave signal or the dimming signal RS1.
  • the fourth driving switch may correspond to a driving switch in which a first terminal (eg, a drain of the n-channel MOSFET) is connected to the cathode of the fourth light emitting diode.
  • the AC LED driving and dimming control device has a maximum input voltage Vin.
  • the square wave signal is generated at the reference time point t0, and the front and rear edges of the generated square wave signal are symmetrically extended or reduced from both sides of the reference time point to generate the dimming signal RS2.
  • the dimming signal RS2 of this embodiment has a width extending from the dimming signal RS1 of FIG. 8 and a width smaller than the dimming signal RS3 of FIG. 10 to be described below.
  • the generated square wave signal is preferably located at the center of the square wave signal so that the reference point divides the width of the square wave signal, but the present invention is not limited to such a configuration, and the leading edge or trailing edge of the square wave signal is It may be generated to be located at the reference point.
  • the AC LED driving and dimming control device applies a driving control signal based on the dimming signal RS2 to the driving switch of the LED light source unit during the specific sub period t3 to t4.
  • the LED emission controller turns on the third driving switch in the first sub-section SP2 based on the dimming signal SP2 and turns on the fourth driving switch in the second sub-section SP1.
  • the third driving switch is turned on.
  • the first, second and fourth drive switches have a turn-off state in the first and third sub-sections
  • the first, second and third drive switches have a turn-off state in the second sub-sections.
  • the second sub period corresponds to the first sub period in FIG. 8.
  • the driving control signal based on the dimming signal RS2 is selectively applied to the third and fourth driving switches of the LED light source unit according to the input voltage Vin, the driving voltage according to the input voltage Vin and The driving current I LED is supplied to the LED light source unit during the sub period t3 to t4 of the input periodic voltage. That is, when the driving current is supplied to the LED light source unit according to the operation of the third and fourth driving switches, the first to third LEDs D1, D2, and D3 are turned on in the first sub-section SP2, and the second sub The entire first to fourth LEDs D1, D2, D3, and D4 are turned on in the section SP1, and the first to third LEDs D1, D2, and D3 are turned on in the third sub section SP3.
  • each of the first sub-section and the third sub-section corresponds to a half (1/2) of the second sub-section.
  • the AC LED driving and dimming control apparatus has a light output of four light emitting diodes lit per unit time at the first dimming level of FIG. 8, and emits light per unit time at the second dimming level. It has a light output of seven diodes.
  • the AC LED driving and dimming control device has a maximum input voltage Vin.
  • a square wave signal is generated at the reference time point t0, and the front and rear edges of the generated square wave signal are symmetrically symmetrical from both sides of the reference time point to generate the dimming signal RS3.
  • the AC LED driving and dimming control device applies a driving control signal based on the dimming signal RS3 to the driving switch of the LED light source unit during the specific sub period t5 to t6.
  • the LED emission controller turns on the third driving switch in the first sub-section SP2 based on the dimming signal RS3 and turns on the fourth driving switch in the second sub-section SP1.
  • the third driving switch is turned on.
  • the first, second and fourth drive switches have a turn-off state in the first and third sub-sections
  • the first, second and third drive switches have a turn-off state in the second sub-sections. .
  • the driving control signal based on the dimming signal RS3 is selectively applied to the third and fourth driving switches of the LED light source unit according to the input voltage Vin, the driving voltage according to the input voltage Vin.
  • a driving current I LED is supplied to the LED light source in a specific sub period t5 to t6 of the input period voltage.
  • driving current is supplied to the LED light source unit according to the sequential operation of the third and fourth driving switches, the first to third LEDs D1, D2, and D3 are turned on in the first sub-section SP2, and the second sub-section is turned on.
  • the entire first to fourth LEDs D1, D2, D3, and D4 are lit at SP1, and the first to third LEDs D1, D2, D3 are lit at the third sub-section SP3.
  • the lengths of the first to third sub-sections may be substantially the same.
  • the alternating current LED driving and dimming control apparatus has a light output of four light emitting diodes lit per unit time at the first dimming level of FIG. 8, and emits light per unit time at the third dimming level. It has a light output of 10 diodes.
  • the AC LED driving and dimming control device is a point in time at which the input voltage Vin has a maximum value.
  • a square wave signal is generated at the reference time point t0, and the front and rear edges of the generated square wave signal are adjusted to be symmetrical with respect to the reference point at both sides of the reference point to generate the dimming signal RS4.
  • the AC LED driving and dimming control device applies a driving control signal based on the dimming signal RS4 to the driving switch of the LED light source unit during the specific sub period t7 to t8. That is, the LED light emission controller turns on the second driving switch in the first sub-section SP4 through the PWM driving control signal based on the dimming signal RS4 and turns on the third driving switch in the second sub-section SP2. Turn on, turn on the fourth drive switch in the third sub-section SP1, turn on the third drive switch in the fourth sub-section SP3, and turn on the fourth drive switch in the fifth sub-section SP5. 2 Turn the drive switch on.
  • the first, third and fourth driving switches have a turn-off state in the first and fifth sub-sections, and the first, second and fourth driving switches are turned off in the second and fourth sub-sections. Has a state, and in the third sub-section, the first, second and third driving switches have a turn-off state.
  • the driving control signal based on the dimming signal RS4 is selectively applied to the second, third and fourth driving switches of the LED light source unit according to the input voltage Vin, the driving voltage is applied to the input voltage Vin.
  • the driving voltage and the driving current (I LED ) is supplied to the LED light source in a specific sub period (t7 ⁇ t8) of the input period voltage.
  • the first and second LEDs D1 and D2 are turned on in the first sub-section SP4, and The first to third LEDs D1, D2, and D3 are turned on in the second sub period SP2, and the first to fourth LEDs D1, D2, D3, and D4 are turned on in the third sub period SP1.
  • the first to third LEDs D1, D2, and D3 light up in the fourth sub period SP3, and the first and second LEDs D1 and D2 light up in the fifth sub period SP5.
  • the lengths of the second to fourth sub-sections may be substantially the same, and the lengths of the first and fifth sub-sections may correspond to half of the third sub-sections.
  • the alternating current LED driving and dimming control apparatus has a light output of four light emitting diodes lit per unit time at the first dimming level of FIG. 8, and emits light per unit time at the fourth dimming level. It has a light output of 12 diodes.
  • the AC LED driving and dimming control device is a point in time at which the input voltage Vin has a maximum value.
  • the square wave signal is generated at the reference time point t0, and the dimming signal RS5 is generated by adjusting the leading edge and the trailing edge of the generated square wave signal on both sides of the reference time to be symmetrical with respect to the reference time point.
  • the AC LED driving and dimming control device applies a driving control signal based on the dimming signal RS5 to the driving switch of the LED light source unit during the specific sub period t9 to t10. That is, the LED emission controller turns on the second driving switch in the first sub-section SP4 through the PWM driving control signal based on the dimming signal RS5 and turns on the third driving switch in the second sub-section SP2. Turn on, turn on the fourth drive switch in the third sub-section SP1, turn on the third drive switch in the fourth sub-section SP3, and turn on the fourth drive switch in the fifth sub-section SP5. 2 Turn the drive switch on.
  • the first, third and fourth driving switches have a turn-off state in the first and fifth sub-sections, and the first, second and fourth driving switches are turned off in the second and fourth sub-sections. Has a state, and in the third sub-section, the first, second and third driving switches have a turn-off state.
  • the driving control signal based on the dimming signal RS5 is selectively applied to the second, third and fourth driving switches of the LED light source unit according to the input voltage Vin, the driving voltage is applied to the input voltage Vin.
  • the driving voltage and the driving current (I LED ) is supplied to the LED light source in a specific sub period (t9 ⁇ t10) of the input period voltage.
  • the first and second LEDs D1 and D2 are turned on in the first sub-section SP4, and The first to third LEDs D1, D2, and D3 are turned on in the second sub period SP2, and the first to fourth LEDs D1, D2, D3, and D4 are turned on in the third sub period SP1.
  • the first to third LEDs D1, D2, and D3 light up in the fourth sub period SP3, and the first and second LEDs D1 and D2 light up in the fifth sub period SP5.
  • the lengths of the first to fifth sub-sections may be substantially the same.
  • the AC LED driving and dimming control apparatus has a light output of four light emitting diodes lit per unit time at the first dimming level of FIG. 8, and emits light per unit time at the fifth dimming level. It has a light output of 14 diodes.
  • FIG. 13 is a view showing an AC LED driving and dimming control method according to another embodiment of the present invention according to the dimming level.
  • the AC LED driving and dimming control method according to the above-described embodiment with reference to FIGS. 8 to 12 corresponds to a case in which a dimming signal extended or reduced symmetrically with respect to the reference time point is used, and FIG.
  • the AC LED driving and dimming control method corresponds to a case in which the front and rear edges of the square wave signal use dimming signals extended or reduced in different widths based on the reference time point.
  • the AC LED driving and dimming control apparatus generates a square wave pulse at a reference time point at which the input voltage has a maximum value, and the front and rear edge portions of the square wave signal at both sides of the reference time point.
  • the AC LED driving and dimming control device applies a driving control signal for limiting at least one of an input voltage, a driving voltage according to the input voltage, and a driving current based on the dimming signal to the LED light source unit to control the input voltage under the dimming level.
  • the driving and dimming of the LED light source unit may be controlled so that the number of LED groups emitting light increases or the number of LED groups emitting light decreases as the size of the input voltage decreases.
  • the AC LED driving and dimming control device When the dimming level is the sixth dimming level, the AC LED driving and dimming control device generates a square wave signal at a reference time point t0 at which the input voltage Vin has a maximum value, and the leading edge of the generated square wave signal.
  • the rear and rear edges are adjusted to be positioned at points of different widths from both sides of the reference point to generate the left and right asymmetric dimming signals RS6 with respect to the reference point.
  • the AC LED driving and dimming control device applies a driving control signal based on the dimming signal RS6 to the driving switch of the LED light source unit during the specific sub period t9 to t11. That is, the LED emission controller turns on the second driving switch in the first sub-section SP4 through the PWM driving control signal based on the dimming signal RS5 and turns on the third driving switch in the second sub-section SP2. Turn on, turn on the fourth driving switch in the third sub-section SP1, turn on the third driving switch in the fourth sub-section SP3.
  • the first, third and fourth driving switches have a turn-off state in the first sub-section
  • the first, second and fourth driving switches have a turn-off state in the second and fourth sub-sections.
  • the first, second and third driving switches have a turn-off state.
  • the driving control signal based on the dimming signal RS6 is selectively applied to the second, third and fourth driving switches of the LED light source part in accordance with the input voltage Vin, the driving voltage is applied to the input voltage Vin.
  • the driving voltage and the driving current (I LED ) is supplied to the LED light source in a specific sub period (t9 ⁇ t11) of the input period voltage.
  • the first and second LEDs D1 and D2 are turned on in the first sub-section SP4, and The first to third LEDs D1, D2, and D3 are turned on in the second sub period SP2, and the first to fourth LEDs D1, D2, D3, and D4 are turned on in the third sub period SP1.
  • the first to third LEDs D1, D2, and D3 light up.
  • the combination of the left and right asymmetric dimming signals in FIGS. 8 to 12 eliminates the problem of partial lighting in the LED dimming control and enables the implementation of a dense dimming level.
  • the present invention in the AC LED driving and dimming control apparatus and method of the present invention, if the input voltage is a square wave signal or a similar signal generated corresponding to a reference point having a maximum value, the center portion of the signal is on the reference point. It can be seen that the present invention can be applied regardless of whether it is located at the front edge or the trailing edge of the signal.
  • the alternating current LED driving and dimming control apparatus and method if the signal generated in response to the reference time so as to be based on the entire lighting of the light emitting diode of the LED light source when controlling the light output of the LED light source unit Both left-right symmetrical or left-right asymmetric dimming signals of the reference time point may be used.
  • the present invention relates to an AC light emitting diode driving and dimming control device and method thereof.

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  • Circuit Arrangement For Electric Light Sources In General (AREA)

Abstract

La présente invention concerne un dispositif et un procédé de commande du fonctionnement et de la gradation d'une DEL à courant alternatif qui peut commander la sortie optique d'une source de lumière à DEL à courant alternatif sur la base de la luminosité totale de la DEL. Le dispositif de commande du fonctionnement et de la gradation d'une DEL à courant alternatif comprend : une unité de réception de tension d'entrée qui reçoit une tension d'entrée dont l'amplitude varie régulièrement dans le temps ; une unité de commande de gradation qui crée un signal pour ajuster, en fonction d'un niveau de gradation, la longueur d'une section d'émission de lumière durant laquelle la source de lumière à DEL comprenant une pluralité de groupes de DEL émet de la lumière, le signal étant un signal de gradation qui est créé par extension ou réduction de la largeur d'un signal carré dépendant du niveau de gradation par ajustement des positions du bord avant et du bord arrière du signal carré créé à un instant de référence auquel la tension d'entrée possède une valeur maximale jusqu'à une certaine largeur sur les deux côtés ; et une unité de commande d'émission de lumière de DEL qui applique, sur la source de lumière à DEL, un signal de commande de fonctionnement qui limite au moins l'un de la tension d'entrée, d'une tension de fonctionnement et d'un courant de fonctionnement en fonction de la tension d'entrée en réponse au signal de gradation et qui commande le fonctionnement et la gradation de la source de lumière à DEL de telle sorte que le nombre de groupes de DEL émettant de la lumière augmente à mesure que l'amplitude de la tension d'entrée augmente sous le niveau de gradation ou de telle sorte que le nombre de groupes de DEL émettant de la lumière diminue à mesure que l'amplitude de la tension d'entrée diminue.
PCT/KR2013/010144 2012-11-08 2013-11-08 Dispositif et procédé de commande de fonctionnement et de gradation d'une del à courant alternatif WO2014073911A1 (fr)

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KR20200025880A (ko) 2018-08-31 2020-03-10 삼성전자주식회사 디스플레이 장치 및 그 제어 방법

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