WO2016085124A1 - Système d'éclairage à led ca exempt de scintillement - Google Patents

Système d'éclairage à led ca exempt de scintillement Download PDF

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Publication number
WO2016085124A1
WO2016085124A1 PCT/KR2015/011119 KR2015011119W WO2016085124A1 WO 2016085124 A1 WO2016085124 A1 WO 2016085124A1 KR 2015011119 W KR2015011119 W KR 2015011119W WO 2016085124 A1 WO2016085124 A1 WO 2016085124A1
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Prior art keywords
light emitting
current
valley
voltage
charging
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PCT/KR2015/011119
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English (en)
Korean (ko)
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류태하
정동열
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류태하
주식회사 디엠비테크놀로지
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Publication of WO2016085124A1 publication Critical patent/WO2016085124A1/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]
    • H05B45/30—Driver circuits
    • H05B45/395—Linear regulators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S2/00—Systems of lighting devices, not provided for in main groups F21S4/00 - F21S10/00 or F21S19/00, e.g. of modular construction
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21K—NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
    • F21K2/00—Non-electric light sources using luminescence; Light sources using electrochemiluminescence
    • 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
    • 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
    • H05B45/37—Converter 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
    • 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
    • Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

Definitions

  • This embodiment relates to a flicker-free AC LED lighting system.
  • LED (Lighting Emitting Diode) lighting uses the DC LED lighting system that supplies the LED driving current by using the DC voltage converted by the AC / DC converter according to the driving method, and the AC voltage rectified by the full-wave rectification without any conversion process.
  • AC LED lighting system that supplies the LED driving current.
  • the AC LED lighting system does not control PWM (Pulse Width Modulation), so it is a switch, an inductor, a capacitor, etc. It does not use bulky components, so it takes up less space in the drive circuit and has good reliability and ease of design.
  • PWM Pulse Width Modulation
  • FIGS. 1A and 1B are diagrams showing an example and an operating waveform of a conventional AC LED lighting system 100.
  • the AC LED lighting system 100 of FIG. 1A includes a full-wave rectifier 110 for full-wave rectifying and converting an AC input voltage into a pulse current voltage, a light-emitting unit 120 for receiving and receiving a pulsed output voltage of the full-wave rectifier 110 and emitting light.
  • An AC LED driver 130 for supplying a driving current to the unit 120 and a reference voltage generator 140 for providing a driving reference voltage to the AC LED driver 130 are provided.
  • Each single light emitting unit from the first stage light emitting unit LED1 to the fourth stage light emitting unit LED4 may be actually a configuration in which a plurality of LEDs are connected in series, or a series and parallel connection in which a series and a parallel connection are mixed.
  • the AC LED driver 130 outputs driving currents I1 to I4 respectively driving the first stage light emitting unit LED1 to the fourth stage light emitting unit LED4.
  • the diode on voltages of the first stage light emitting unit LED1 and the fourth stage light emitting unit LED4 will be named VLED1 to VLED4, respectively, and the operation method of the AC LED lighting system 100 will be briefly described with reference to the operation waveform of FIG. It will be described.
  • a bias circuit which is not explicitly shown in FIG. 1A, is operated, and accordingly, the reference voltage generator 140 outputs the reference voltages VREF1 to VREF4 to output the AC LED driver 130.
  • the AC LED driver 130 is in a state capable of supplying I4 to the light emitting unit 120 at the driving current I1. However, since the light emitting unit input voltage Vin is lower than the voltage capable of driving the first stage light emitting unit LED1, all driving currents from I1 to I4 are in a zero state.
  • the VCS voltage maintains VREF1 as a result of the feedback by the amplifier A1 and M1.
  • the driving current I2 increases, the driving current I1 decreases and the sum operates while the value of VREF1 / RCS is maintained.
  • the operation during one period can be easily understood by referring to the operation waveform diagram of FIG. 1B and the operation description above.
  • the fundamental wave component of the light emitting unit input current Iin of the AC LED lighting system 100 has the same phase as the light emitting unit input voltage Vin, so the power factor is very good and the THD (Total Harmonic Distortion) characteristics are excellent.
  • the sections Toff1 and Toff2 are generated in which the output currents I1 to I4 of the AC LED driver 130 are all zero. These intervals occur at the same intervals in every Vin cycle, resulting in invisible flicker that is unrecognizable to the human eye, but those who are sensitive to these flicker can cause headaches, anxiety, and seizures.
  • Figure 2 shows how to quantify these flickers by specification.
  • Percent Flicker P.F
  • Flicker Index F.I
  • the maximum value of the light output is A
  • the minimum value B is A1
  • the area of the area larger than the average value of the light output is A1 and the area of the small area is A2
  • the flicker index is more effective in indicating asymmetrical waveform characteristics or periodic flicker of light output waveforms, and is widely used in regulations that limit the homogeneity of light output.
  • the percent flicker is equal to 100 for two light sources having different sizes of the sections Toff1 and Toff2 where the light output becomes zero, but the flicker index has different values so that the light output waveform can be well characterized. .
  • 3a and 3b is a view showing an example of the prior art for improving the flicker characteristics by avoiding a section in which the light output is zero in the conventional AC LED lighting system 100 of FIGS. 1a and 1b in the power electronic system
  • the valley fill AC LED lighting system 200 of the prior art in which a valley fill circuit of the AC input voltage is added to the rear end of a full-wave rectifier by using a commonly used valley fill circuit, can be operated.
  • the sign of the light emitter, the light emitter input voltage and the current, and the drive current sign of each single light emitter have the same function, although the operating waveforms are different.
  • the valley fill AC LED lighting system 200 further includes a valley fill circuit 250 in a system including a full wave rectifier 210, a light emitting unit 220, an AC LED driver 230, and a reference voltage generator 240. It is an added system.
  • the valley fill circuit 250 drives the LED load during the valley period by compensating for the period in which the LED is turned off because the AC input power is so low that the LED load cannot be driven, and the two valley fill capacitors CV1 and CV2 are provided. It consists of three valley-fill diodes DV1, DV2, and DV3, and has an inrush current limiting resistor in place on the charge path to limit excessive inrush current flow as soon as CV1 and CV2 start to charge. For example, it may be added between the full-wave rectifier 210 and the valley fill circuit 250 or before or after DV2.
  • FIG. 3B is a view illustrating an operation waveform of the valley fill AC LED lighting system 200, and the operation of the valley fill circuit 250 will be briefly described with reference to FIG. 3B.
  • the diode-on voltage of the full-wave rectifier 210 and the valley-fill circuit 250 is very small compared to the AC input voltage, it is ignored and the valley-fill capacitors CV1 and CV2 have the same capacitor value.
  • the first mode is a period denoted by Tchg in the waveform diagram of FIG. 3B, and the full-wave rectified AC input voltage is greater than the sum of the voltages charged in series connected CV1 and CV2.
  • DV1 and DV3 are off and DV2 is on to charge CV1 and CV2 from the AC input supply through the path of CV1-DV2-CV2-ground, and CV1 and CV2 are charged to Vpeak / 2 voltage respectively.
  • IAC Ivalley + Iin.
  • the second mode is a period denoted by Tflot in the waveform diagram of FIG. 3B, in which the AC input voltage is smaller than the sum of the voltages charged in CV1 and CV2 but greater than Vpeak / 2.
  • DV1, DV2, and DV3 are all turned off, so that CV1 and CV2 are all off.
  • the third mode is a section labeled Tvalley in the operation waveform diagram of FIG. 3B.
  • the DV1 and DV3 are turned on and the DV2 is turned off, and the CV1 and CV2 are connected in parallel to each other.
  • the load current is supplied to the LED load 220.
  • the light emitting unit 220 is required to design the valley fill AC LED lighting system 200 to operate properly.
  • the on-voltage of the first stage light emitting unit LED1 to the fourth stage light emitting unit LED4 is respectively displayed as VLED1 to VLED4
  • the charging voltage of the valley fill circuit 250 is Vpeak / 2
  • the discharge period is Tvalley.
  • the final discharge voltage of CV1 and CV2 should have a sufficient capacitor value so as not to fall to a voltage lower than the on-voltage VLED1 of the first stage light emitting portion (LED1).
  • each stage LED configuration of the light emitting unit 220 should be configured such that VLED1 ⁇ Vpeak / 2 ⁇ (VLED1 + VLED2). If the sum of the voltages charged in CV1 and CV2 is greater than the sum of the on voltage of the first stage light emitting unit and the on voltage of the second stage light emitting unit (LED2), the first stage driving current I1 is always turned off and operates like a three stage LED. Done.
  • the peak current flows because the CV1 and the CV2 must be charged during the Tchg period by the energy discharged from the CV1 and the CV2 during the Tvalley period.
  • This peak input current becomes larger as the output power of the LED light is higher.
  • the valley-fill AC LED lighting system 200 of the prior art degrades electrical characteristics such as THD and Electro Magnetic Interference (EMI), and the AC input to improve EMI characteristics.
  • EMI Electro Magnetic Interference
  • the first stage current is not zero even in a valley section, and thus a constant value can be maintained to improve flicker characteristics.
  • the second stage driving current I2 starts to be output.
  • the subsequent operation is performed in a similar manner as described with reference to FIG. 1B.
  • the flicker index is still poor and the very large peak current through the AC input leads to the need for a very large EMI filter.
  • the driving method using AC / DC converter in LED driving method is basically a method of converting AC input to DC output, so it is possible to supply a constant driving current to the LED load so that it can produce a constant light output. It will be a drive type.
  • the AC driving method does not use the PWM switching control method, the driving circuit occupies little space, has high reliability, relatively easy to design, and has excellent electrical characteristics such as power factor, THD, EMI, etc. 1B, since the LED cannot be driven until the AC input power voltage is increased enough to basically turn on the LED, a section in which the driving current becomes zero occurs in the LED, thereby causing flicker.
  • high-side switching devices use discrete devices, and the SoC (System) makes a high-side gate driver and control circuit into one chip to control on / off of these devices.
  • SoC System
  • it can be implemented in the form of an On Chip IC or a hybrid IC, a large number of high voltage MOSFET switches and a gate driver to drive them are required. Significantly increased, there is an unrealistic problem in terms of price and reliability compared to the DC driving method.
  • This embodiment solves the above problems and does not use a high-side MOSFET transistor and gate driver to provide a low cost, high reliability flicker-free AC LED lighting system, which is the only universal for system implementation. To provide a flicker-free AC LED lighting system that uses an AC LED SoC.
  • the Universal AC LED SoC of this embodiment provides the charge current source and flicker-free characteristics for controlling the charge current of the active valley fill circuit and the diodes required in the active valley fill circuit of this embodiment.
  • a flicker-free control IC that integrates control circuits into one chip is a SoC packaged into one chip. More specifically, the lead frame with the valley-fill diodes and the flicker-free control IC in the universal AC LED SoC is isolated from each other, so that an electrical short through the lead frame does not occur.
  • the drive method receives AC input directly, it avoids the arc discharge problem that can occur between the pins of high voltage input SoC, but does not use jumper during PCB (Printed Circuit Board) wiring process.
  • the pin assignment of the SoC was decided to simplify the PCB wiring of the entire AC LED lighting system, and this pin assignment further added a lead frame for bonding wiring to solve the short-term short-circuit problem that occurs during the bonding of the SoC.
  • the parts of the active valley-fill circuit 10 and the flicker-free control IC in the added lead frame are bonded to each other internally or externally and are packaged as a single chip.
  • the flicker-free control IC in the universal AC LED SoC of the present embodiment further includes a circuit capable of controlling the charging current of the active valley fill circuit 10.
  • the change of the charging current value is performed by one external pin. It is configured to be set by resistance value connected between grounds.
  • the valley fill current may be changed in any other way, such as configured to be changed by an external voltage, and the present embodiment may not be out of the spirit of the present embodiment. It is self-evident that it must be protected within.
  • the active valley fill circuit 10 of the present embodiment is composed of five valley fill diodes and two valley fill capacitors, unlike the conventional valley fill circuit, and the active valley of the present embodiment is included in the universal AC LED SoC of the present embodiment.
  • the fill circuit 10 five valleyfill diodes are integrated inside the SoC.
  • the flicker-free control IC of the present embodiment is an IC in which a driving circuit capable of controlling the light output of a multi-stage LED light emitting unit is more integrated. Ideally, no flicker occurs, so that the flicker index is zero. It is a control IC that can implement a system. Specifically, the size of the LED light output is almost proportional to the LED driving current due to the characteristics of the LED. When the next stage is turned on and emits more light in the multi-stage light emitting unit, the number of LEDs is increased so that a constant light output can be maintained.
  • the driving current is output from the step-up / down AC LED driver of the present embodiment by outputting the LED driving current of the next stage to a value smaller than the LED driving current of the previous stage.
  • the step up / down AC LED driver of the present embodiment has a step down in which the driving current value of the next stage can be driven smaller than the driving current value of the previous stage.
  • the step-up / down AC LED driver of the present embodiment is a voltage output terminal of the N-stage luminous current driver from an earlier stage luminous current driver to an input terminal corresponding to the (N-1) luminous current driver.
  • Each of the (N-1) stage luminous current drivers is connected to the respective output terminals of the (N-1) stage luminous current driver and the (N-2) stage luminous current driver respectively. It has a configuration of multiple feedback loops connected to feedback.
  • the step-up / down AC LED driver of the present embodiment may configure step-up LED driving in which the driving current value increases as the number of LEDs emitting light increases, as in the prior art AC LED driver.
  • it is a universal AC LED driver that can configure step up / down LED driving, which can be driven to increase or decrease the drive current compared to the drive current.
  • the magnitude of each stage driving current is determined according to the magnitude of the resistance value connected to the ground at the voltage output terminal of each stage of the luminous current driving unit. Since the voltage output stage of each stage of the step-up / down AC LED driver of the present embodiment is connected to an external pin, the driving current value of each stage of the step-up / down AC LED driver is increased by the external resistance value. As a result, it is possible to increase, decrease or increase / decrease the system, so that the system can be configured to meet various needs of AC LED lighting system. However, it is obvious that all or part of the resistors that set the driving current of each stage may be integrated in the IC.
  • the charging process and the discharging process are mutually corresponding to the period of the AC input power according to the voltage magnitude of the AC input power.
  • a valley compensator for discharging the charged energy to supply a current for driving the light emitting diode module
  • a light emitting current controller configured to supply a driving current corresponding to the changed light emitting diode unit to the light emitting diode module when the light emitting diode unit emitting light according to the voltage level of the AC input power is changed
  • a valley charging control unit configured to control the charging current of the valley compensator by a preset first reference voltage and a predetermined charging current setting resistor.
  • the device for controlling the drive current supplied to the light emitting diode module including first to nth (where n is a natural number of two or more) light emitting diode portion sequentially connected to the input power source, A first to n-th light emitting current driving unit connected to one end of each of the first to nth (n is natural numbers of two or more) light emitting diode parts to supply the driving current, and the first to nth light emitting current
  • Each of the drivers receives a reference voltage, and the first luminous current driver is fed back from the voltage output terminal of the second to nth luminous current drivers to the corresponding input terminal of the first luminous current driver, and k (1 ⁇ k ⁇ n , k is a natural number)
  • the light emitting current driver is fed back from the voltage output terminal of the (k + 1) to the nth light emitting current driver to the corresponding input terminal of the kth light emitting current driver, It provides a light emitting current control unit showing
  • the AC LED lighting system of the present embodiment is to implement a flicker-free AC LED lighting system that is AC driven but not flicker, and more specifically, a universal AC LED SoC for implementing a flicker-free lighting system is provided. It is also intended to enable low cost, high reliability flicker-free AC LED lighting systems.
  • FIG. 1A and 1B show an example and an operating waveform of a typical AC LED lighting system.
  • 3A and 3B show an example and operating waveform of a typical valley fill AC LED lighting system.
  • FIG. 4 is a view showing a flicker-free AC LED lighting system according to the present embodiment.
  • 5A and 5B are diagrams and operational waveforms showing in more detail the flicker-free AC LED lighting system according to the present embodiment.
  • 6A to 6D are views showing various circuits and symbols of the P- N N amplifier constituting the single emission current driving units of the step-up / down AC LED driver according to the present embodiment.
  • FIG. 7 shows a step up / down AC LED driver according to the present embodiment.
  • FIG. 8 is a diagram illustrating a parallel driving method according to the present embodiment.
  • FIGS 9A to 9C are diagrams showing operational waveforms of the flicker-free AC LED lighting system according to the present embodiment.
  • FIGS 10A and 10B are diagrams showing operation waveforms when the setting of each stage driving current is different in the flicker-free AC LED lighting system according to the present embodiment.
  • FIG. 4 is a diagram showing an example of the flicker-free AC LED lighting system 300 of the present embodiment.
  • the flicker-free AC LED lighting system 300 sets the driving current of the full-wave rectifier 310, the light emitting unit 320, the universal AC LED SoC 330, the valley-fill capacitors CV1 and CV2, and the single light emitting current driving unit. It consists of resistors R1 through R5, valley fill current setting resistor R5, and regulator output capacitor CVDD.
  • the light emitting unit 320 is connected in series from the first stage light emitting unit LED1 to the fourth stage light emitting unit LED4.
  • the pin configuration of the universal AC LED SoC 330 is a power input terminal VP, a ground terminal VN, a first stage current output terminal S1, a two stage current output terminal S2, and a three stage current that receive an AC input directly, respectively.
  • Negative input terminal CN1 of the fill capacitor, and positive input terminal CP of the second valleyfill capacitor and negative input terminal CN2, voltage output terminal RC of the active valleyfill charging control unit 26, analog dimming control input It consists of the pins of terminal ADIM and regulator output terminal VDD.
  • the pin configuration of the universal AC LED SoC 330 further includes four unused NC pins.
  • NC pins between CN1 and VP, VP and S1, and S1 and S2 are intentionally inserted to prevent the high voltage arc discharge from occurring between the pins with high AC voltage.
  • the negative input terminal CN2 of the second valley fill capacitor of the active valley fill circuit 10 is a drive current output terminal of the active valley fill charging control unit 26.
  • the power input terminal VP of the universal AC LED SoC 330 is connected to the light emitting unit input voltage Vin and the ground terminal VN is connected to the ground terminal of the full-wave rectifier 310.
  • the first stage drive current value is determined by the value of the resistor R1 connected between the first stage voltage output terminal RS1 and the ground
  • the second stage drive current value is determined by the value of the resistor R2 connected between the second stage voltage output terminal RS2 and the ground.
  • the three-stage drive current value is determined by the value of the resistor R3 connected between the three-stage voltage output terminal RS3 and ground
  • the four-stage drive current value is determined by the value of the resistor R4 connected between the four-stage voltage output terminal RS4 and ground. Determined by
  • the charging current value of the active valley fill circuit 10 is determined by the value of the resistor R5 connected between the voltage output terminal RC of the active valley fill charging control unit 26 and the ground.
  • the first valley fill capacitor CV1 of the active valley fill circuit 10 is connected between the light emitting unit input voltage Vin and the negative input terminal CN1 of the first valley fill capacitor, and the second valley fill capacitor of the active valley fill circuit 10 is connected.
  • CV2 is connected between the positive input terminal CP and the negative input terminal CN2 of the second valley-fill capacitor and CV1 and CV2 are normally designed to have the same value.
  • the first valleyfill diode DV1 of the active valley fill circuit 10 has a cathode connected to CN1 and an anode connected to VN
  • a second valleyfill diode DV2 has an anode connected to CN1 and a cathode connected to CP
  • a third Valleyfill diode DV3 has an anode connected to CP and a cathode connected to VP
  • a fourth valleyfill diode DV4 has an anode connected to VN and a cathode connected to CN2
  • a fifth valleyfill diode DV5 has an anode connected to CN2 and a cathode active to CN2. It is connected to one end of the valley fill charging control unit 26.
  • Capacitor CVDD may be further added between the regulator output terminal VDD and ground, and although not shown in the circuit of FIG. 4, the output voltage range is universal in the analog dimming terminal ADIM, such as an external dimmer such as 0-10 dimmer.
  • ADIM analog dimming terminal
  • a resistance divider circuit and a stabilization capacitor may be further added.
  • the flicker-free AC LED lighting system 300 of the present embodiment is not a simple valley fill circuit of the related art compensating the valley section of the AC input power, but controls the charging current for charging the valley fill capacitor, and more specifically, the valley section.
  • the energy discharging from the valley-fill capacitor during the same period is the energy to charge the valley-fill capacitor during the charge of the valley-fill capacitor, so controlling the current to charge the valley-fill capacitor can control the voltage charged to the valley-fill capacitor.
  • the charging current of the prior art valley fill circuit is deteriorated in the electrical characteristics due to the peak charging current flowing in a short period of time, whereas the present embodiment controls the charging current of the valley fill circuit to lower the charging current for a wide charging period. To improve the electrical characteristics.
  • the voltage charged in the valley fill capacitor through the charging current control is greater than the on voltage VLED1 of the first stage light emitting unit LED1 of the light emitting unit 320 while the first stage light emitting unit LED1 and the second stage light emitting unit LED2
  • Each LED of the light emitting unit 320 may be configured to be smaller than the sum of the on voltages (VLED1 + VLED2).
  • the universal AC LED SoC 330 of the present embodiment further includes an active valley fill charging control unit 26 for setting a charging current of the active valley fill circuit 10, and a voltage output terminal RC. The value of the charge current is determined by the value of the resistor R5 connected between grounds.
  • the universal AC LED SoC 330 When the number of LEDs emitting light increases as the number of light emitting stages of the light emitting unit 320 increases and thus the light output increases, the universal AC LED SoC 330 also increases the number of light emitting driving currents. It is a SoC that controls flicker-free so that flicker-free characteristics can be realized even in AC driving.
  • FIG. 5A is a more detailed view of the universal AC LED SoC 330 in the flicker-free AC LED lighting system 300 and FIG. 5B is an operational waveform diagram.
  • the universal AC LED SoC 330 is a SoC in which the diodes DV1 to DV5 are integrated in one chip in the flicker-free control IC 20 and the active valley fill circuit 10.
  • the flicker-free control IC 20 includes a step up / down AC LED driver 21, a dimming unit 22, a regulator 23, a protection circuit 24, a bias circuit 25 and an active valley fill charging control unit 26. It consists of).
  • the bias circuit 25 generates bias voltages and currents for each functional block of the universal AC LED SoC 330 from the AC voltage input terminal VP to operate normally, although not explicitly shown in FIG. 5A.
  • the dimming unit 22 receives a voltage from the analog dimming input terminal ADIM and outputs a reference voltage VREF to the step-up / down AC LED driver 21 and the active valley fill charging control unit 26.
  • the step-up / down AC LED driver 21 and the active valley fill charging control unit 26 receive the same reference voltage from the dimming unit 22, different reference voltages may be supplied.
  • the reference voltage may be supplied from the bias circuit 25 instead of the dimming unit 22.
  • the regulator 23 outputs a constant voltage to the VDD terminal and may further add a capacitor between the VDD terminal and the ground.
  • the protection circuit 24 is a circuit for preventing damage to the IC due to abnormal conditions such as pin shorts of the flicker-free control IC 20 or excessive temperature rise of the IC.
  • the first stage driving current of the step-up / down AC LED driver 21 is determined by the R1 resistance value connected between the RS1 terminal and the ground, and the second stage driving current is determined by the R2 resistance value connected between the RS2 terminal and the ground.
  • the three-stage drive current is determined by the value of the R3 resistor connected between the RS3 terminal and ground, and the four-stage drive current is determined by the value of the R4 resistor connected between the RS4 terminal and ground.
  • the number of series-connected LEDs constituting the first stage light emitting unit (LED1) is k1
  • the number of series-connected LEDs constituting k3 and four-stage light emitting units (LED4) is k4
  • the light output of the LED is almost linearly proportional to the LED driving current. Therefore, when only the first stage light emitting unit (LED1) emits light, the light output is k1.
  • the light output is proportional to (k1 + k2) ⁇ I2, and the first stage light emitting unit ( In case of emitting light from LED1) to three-stage light emitting part (LED2), the light output is proportional to (k1 + k2 + k3) ⁇ I3, and emits all of light from one-stage light emitting part (LED1) to four-stage light emitting part (LED4). In this case, the light output is proportional to (k1 + k2 + k3 + k4) ⁇ I4.
  • the above resistance ratio is for realizing the ideal flicker-free or AC LED lighting system with a flicker index of zero, and considering that the flicker index satisfies the flicker specification when the flicker index is less than 0.12 in the international standard, the THD in actual AC LED lighting system In order to improve other electrical characteristics, the ratio of the current set resistance can be varied.
  • the active valley fill circuit 10 of FIG. 5A has two additional diodes DV4 and DV5, and the charging current of the valley fill capacitors CV1 and CV2 is charged with a constant current source Icap. .
  • DV4 is a diode to create the discharge path of CV2 in the discharge mode of the valley fill circuit
  • DV5 is to prevent the current path from the parasitic diode component of the transistor Mc in the discharge mode.
  • the role of the DV5 is that in almost all semiconductor processes, the substrate substrate is of p type and the p substrate is used for the normal operation of the elements of the integrated circuit under normal operation. Is connected to ground.
  • the active valley fill charging control circuit 26 there is a parasitic diode between an anode of the transistor Mc and a cathode of the drain connected to the ground. If there is no DV5 when CV2 is discharged, Mc's parasitic diode is turned on with DV4, and Mc's drain voltage drops to a negative value. As a result, various parasitic elements in the chip are activated and malfunction occurs. DV5 is designed to prevent such malfunctions. DV5 is on in the charging mode of the valley fill circuit, and normal charging operation is performed in the discharge mode. However, DV5 is turned off in the discharge mode to prevent Mc parasitic diodes from turning on. Of course, if there is a semiconductor process where a high voltage transistor can isolate the substrate, DV5 can be eliminated.
  • the active valley fill circuit 10 is charged with a controlled charging current when the AC input power voltage is sufficiently high according to the voltage magnitude of the full-wave rectified AC input power, and the AC input power voltage is a light emitting diode module ( When the first stage of the light emitting unit 320 is too low to drive, the charged energy is discharged to drive the light emitting diode module 320. When the AC input power voltage is in the above state, the charging is performed. It can be implemented as a valley compensator that repeats the operation of maintaining only the charging voltage without the discharge and corresponding to the cycle of the AC input power.
  • the valley compensation unit is connected in parallel with the LED module at one end of the input power and repeats charging and discharging according to the cycle of the input power.
  • the valley compensator discharges the charged energy to discharge the LED module.
  • Supplying a discharge current to drive the power supply and maintains the charging voltage when the input power supply voltage is greater than the charging voltage and less than the predetermined voltage, and if the input power supply voltage is more than the preset voltage, the charging current from the input power supply to the set size.
  • the active valley fill circuit 10 provides a current for driving the light emitting diode module 320 during discharge, and is connected in parallel to the light emitting diode module and the AC input power rectified.
  • the active valley fill circuit 10 operates in the discharge mode, the charging mode, and the floating mode based on the charging voltage determined by the control of the charging current determined by the active valley fill charging controller 26.
  • the active valley fill circuit 10 operates in the discharge mode when the full-wave rectified AC input power supply voltage is smaller than the charging voltage, and operates in the charge mode when the full-wave rectified AC input power supply voltage is greater than twice the charging voltage. .
  • the active valley fill circuit 10 operates in a floating mode when the full-wave rectified AC input power supply voltage is greater than or equal to the charging voltage and less than or equal to twice the charging voltage.
  • the active valley fill circuit 10 includes a first series circuit, a third valley fill diode DV3, and a second valley fill capacitor, in which a first valley fill capacitor CV1 and a first valley fill diode DV1 are sequentially connected in series.
  • a second series circuit in which the CV2 and the fourth valley-fill diode DV4 are sequentially connected in series, the contacts of the first valley-fill capacitor CV1 and the first valley-fill diode DV1, and the third valley-fill diode DV3.
  • a second valley-fill diode DV2 connected between the contact point of the second valley-fill capacitor CV2.
  • the active valley fill circuit 10 includes a fourth valley fill diode DV4 connected in series with the second valley fill capacitor CV2.
  • the active valley fill circuit 10 may include a fifth valley fill diode connected in series between a contact point of the second valley fill capacitor CV2 and the fourth valley fill diode DV4 and one end of the active valley fill charging controller 26. DV5) further.
  • the active valley fill circuit 10 may include the first valley fill capacitor CV1, the second valley fill diode DV2, the second valley fill capacitor CV2, and the fifth valley that are sequentially connected from the AC input power supply voltage in the charging mode.
  • Charge current is controlled and charged by a path connected to one end of the fill diode (DV5) -active valley fill charging control unit 26, and in the discharge mode, the first through the first series circuit and the light emitting diode module 320 are grounded. Discharge simultaneously through the first discharge path and the second discharge path through the second series circuit and the light emitting diode module 320 from the ground.
  • the active valley fill circuit 10 that is, the valley compensator, includes a first series circuit and a second series circuit (the first series circuit in which the first valley fill capacitor CV1 and the first valley fill diode DV1 are connected in parallel).
  • the second series circuit is sequentially connected in series, and the second valley fill diode (DV3), the second valley fill capacitor (CV2) and the fourth valley fill diode (DV4) are sequentially connected in series), and the first valley fill.
  • the contact between the second valley fill capacitor CV2 and the fourth valley fill diode DV4 is connected in series with the output of the valley charge control unit. And a fifth valleyfill diode DV5 connected thereto.
  • the active valley fill circuit 10 sequentially stores the first valley fill capacitor CV1, the second valley fill diode DV2, the second valley fill capacitor CV2, and the fifth valley fill diode DV5 during charging.
  • the charging current flows through.
  • the charging current is controlled to flow at a constant size by the control of the valley charging control unit.
  • the active valley fill circuit 10 may include a first discharge current, a fourth valley fill diode DV4, and a second discharge current sequentially passing through the first valley fill diode DV1 and the first valley fill capacitor CV1 during discharge.
  • a second discharge current flows through the valley fill capacitor CV2 and the third valley fill diode DV3 sequentially.
  • Tchg of the active valley fill circuit 10 is fixed and the charging current Icap is gradually increased. Then, more energy is charged in the capacitor during Tchg. Since the current discharging during Tvalley is fixed at I1, the Tvalley must be increased to discharge the same energy as the charged energy.
  • increasing Tvalley means that the charging voltage Vcap charged to the capacitor becomes large, and the Vcap increases, so that the AC input voltage is a period in which the AC input voltage is greater than 2 ⁇ Vcap, which is the sum of the voltages charged to the valley-fill capacitor. This means that the charging period becomes smaller, so that the Tchg becomes smaller eventually.
  • valley fill charge current shortens the valley fill charge period, increases the discharge period, and increases the voltage charged to the valley fill capacitor.
  • Higher valley fill charging current and shorter charging periods mean that the peak current is getting larger at the AC input current, resulting in worse THD.
  • the active valley fill charging control unit 26 is a circuit for supplying a valley fill charging current Icap, and includes a differential amplifier Ac and a transistor Mc.
  • the positive input terminal of Ac is connected to the reference voltage VREF, the output of Ac is connected to the gate of Mc, the source of Mc is connected to the negative input terminal of Ac, and at the same time the active valley fill charging control unit ( It is also connected to the voltage output terminal Rc of 26 to complete the unity feedback circuit.
  • the valley fill voltage is determined based on the valley fill charging current value. Since the valley fill voltage is the voltage driving the first stage light emitting unit (LED1) in the valley section Tvalley of the AC input power, the first stage light emitting section in the Tvalley section is used.
  • the valley fill charging current should be set to be greater than the on voltage VLED1 of (LED1) and at the same time smaller than the sum of the on voltages of the first stage light emitting unit LED1 and the second stage light emitting unit LED2, that is, less than VLED1 + VLED2. That is, it must be VLED1 ⁇ Vcap ⁇ (VLED1 + VLED2).
  • the active valley fill charging control unit 26 receives a preset first reference voltage and controls valley charging of the active valley fill circuit 10 by the first reference voltage and the charging current setting resistor. It may be implemented as a controller.
  • the active valley fill charging control unit 26 includes a differential amplifier and a transistor, the differential amplifier receives a first reference voltage from the dimming unit 22, and the transistor is connected in series with the active valley fill circuit 10 to charge current. To supply.
  • a first reference voltage is applied to the positive input terminal of the differential amplifier included in the active valley fill charging control unit 26, the output terminal of the differential amplifier is connected to the gate of the transistor, and the source of the transistor is differential. It is connected to the negative input of the amplifier.
  • the active valley fill charging control unit 26 is connected to the provided voltage output terminal and determines the magnitude of the charging current according to the resistance value of the resistor connected to the voltage output terminal.
  • the driving current must be driven small.
  • the general AC LED drivers 130 and 230 described in FIGS. 1A and 3A have a structure in which the light emission driving current can be driven only as the number of LED driving stages increases as the AC input voltage increases.
  • the step-up / down AC LED driver 21 of the present embodiment can drive the light emission driving current as the number of LED driving stages increases as the AC input voltage increases, thereby implementing a flicker-free AC LED lighting system.
  • the light emission driving current may increase as the number of driving stages increases, such as the general AC LED drivers 130 and 230.
  • each stage driving current of the step-up / down AC LED driver 21 may be configured to increase or decrease the light emission driving current as the number of driving stages increases, or may be configured in any manner.
  • the two-stage light emission driving current is smaller than the one-stage light emission driving current
  • the three-stage driving current is larger than the first-stage driving current
  • the four-stage driving current is smaller than the one-stage driving current but larger than the two-stage driving current.
  • Each single emission drive current value may be set arbitrarily.
  • 6A to 6D are basic blocks constituting the step-up / down AC LED driver 21 of this embodiment, in which one output voltage and one output current are subtracted by subtracting n inputs to one input of this embodiment.
  • the figure shows a P- N N amplifier that can be supplied.
  • FIG. 6A is a circuit diagram and FIG. 6B shows a symbol.
  • the P- n N amplifier has one positive input terminal INp, n negative input terminals INn1 to INn n , a terminal OUT1 for voltage output and a terminal OUT2 for current output.
  • the P- n N amplifier consists of a differential amplifier An, transistor Mn, 2 (n + 1) resistors Ra, Ra1 to Ran, Rb1 to Rbn, and Rf.
  • a resistor Ra is connected between the INp terminal and the positive input terminal n1 of An, n resistors Ra1 to Ran are connected in parallel between n1 and ground, and a resistor Rb1 is connected between the INn1 terminal and the negative input terminal n2 of An.
  • a resistor Rb2 is connected between the INn2 terminal and n2, a resistor Rbn is connected between the INn n terminal and n2, and a resistor Rf is connected between the OUT1 terminal and the n2 terminal.
  • the differential amplifier output n3 is connected to the gate of transistor Mn, the source of Mn is connected to the OUT1 terminal and the drain terminal to the OUT2 terminal.
  • An arbitrary resistor to set the output current is connected between the OUT1 terminal and ground, which can be integrated inside the chip or externally.
  • the OUT2 terminal is connected to one end of the light emitting unit to output a light emission driving current.
  • a reference voltage for setting the light emission drive current is input to the INp terminal, and feedback is provided from the voltage output terminals of the next stage P- n N amplifier to INn1 to INn n terminals, respectively.
  • the input terminal of the P- n N amplifier has four INps, INn1, INn2, and INn3 in total.
  • the output voltage VREF of the dimming unit 22 which is a reference voltage for setting the emission current, is input to the INp terminal, the voltage output terminal of the two-stage luminous current driver is connected to INn1, and the three-stage luminous current is connected to INn2.
  • the voltage output terminal of the driving unit is connected, and the voltage output terminal of the four-stage luminous current driving unit is connected to INn3.
  • the OUT1 terminal voltage is VOUT1
  • the INp terminal voltage is VINp
  • the terminal voltages from INn1 to INn n are respectively VINn1 to VINn n.
  • VOUT1 becomes as shown in Equation 1 below.
  • the two-stage luminous current driver only needs two inputs to receive feedback from the other voltage output terminal.
  • Fig. 6C an example of a possible circuit configuration is shown in Fig. 6C.
  • one of the resistors Rb3 to Rbn other than the resistor connected to the two input terminals among the resistors connected to the negative input terminal of the differential amplifier is open and is also connected to the positive input terminal of the differential amplifier. Open one end of the resistors Ra3 to Ran except the two parallel connected resistors Ra1 and Ra2 among the n parallel connected resistors.
  • the operation of the two-stage luminous current driver can be configured in the same manner even if all the resistors of Ra3 to Ran and Rb3 to Rbn are removed or a circuit is configured to open any one resistor. .
  • FIG. 6D illustrates an example of a four-stage luminous current driver circuit in an n-stage luminous current driver and a four-stage luminous current driver, wherein Ra and Rb are either one. Or you can short everything.
  • Fig. 7 shows the step-up / down AC LED driver 21 using the P- N N amplifier of this embodiment.
  • the step-up / down AC LED driver 21 is composed of a first stage luminous current driver 51, a two stage luminous current driver 52, a three stage luminous current driver 53, and a four stage luminous current driver 54.
  • each stage of the luminous current driving unit is connected to the output voltage VREF of the dimming unit 22, and the negative input terminals are fed back to the corresponding negative input terminals from the voltage output terminal of the next stage.
  • the voltage output terminal OUT1 of the P-3n amplifier of the first stage luminous current driver 51 is connected to the first stage voltage output terminal RS1 of the step-up / down AC LED driver 21, and the resistance value of the resistor R1 connected between RS1 and ground.
  • the first stage driving current I1 is determined, and the current output terminal OUT2 of the first stage luminous current driver 51 P-3n amplifier is connected to the first stage current output terminal S1 of the step-up / down AC LED driver 21. It is further connected to the connection point of the short emitting part LED1 and the two stage light emitting part LED2.
  • the voltage output terminal OUT1 of the two-stage luminous current driver 52 P-2n amplifier is connected to the two-stage voltage output terminal RS2 of the step-up / down AC LED driver 21 and the resistance value of the resistor R2 connected between RS2 and ground.
  • the second stage driving current I2 is determined, and the current output terminal OUT2 of the two-stage luminous current driver 52 P-2n amplifier is connected to the second stage current output terminal S2 of the step-up / down AC LED driver 21. It is further connected to the connection point of the short emitting part LED2 and the three stage light emitting part LED3.
  • the voltage output terminal OUT1 of the 3-stage luminous current driver 53 P-1n amplifier is connected to the three-stage voltage output terminal RS3 of the step-up / down AC LED driver 21 and is connected between RS3 and ground to the resistance value of the resistor R3. 3 stage driving current I3 is determined, and the current output terminal OUT2 of the 3-stage luminous current driver 53 P-1n amplifier is connected to the 3 stage current output terminal S3 of the step-up / down AC LED driver 21, and 3 It is further connected to the connection point of the short emitting part LED3 and the four-level light emitting part LED4.
  • Voltage output terminal OUT1 of the 4-stage luminous current driver 54 P-0n amplifier is connected to the 4-stage voltage output terminal RS4 of the step-up / down AC LED driver 21, and the resistance value of the resistor R4 connected between RS4 and ground.
  • Four stage driving current I4 is determined by the four stage driving current output unit 54, the current output terminal OUT2 of the P-0n amplifier is connected to the fourth stage current output terminal S4 of the step-up / down AC LED driver 21, and 4 It is further connected to the other end of the light emitting part LED4.
  • RS4, RS3, and RS2 terminal voltages are fed back to the three negative input terminals IN1, IN2, and IN3 from the first stage luminous current driver 51, respectively, and the two negative input terminals IN1 and two of the two stage luminous current drivers 52 are fed back.
  • the terminal voltages of RS4 and RS3 are fed back to IN2, and the terminal voltages of RS4 are fed back to one negative input terminal IN1 of the three-stage luminous current driver 53 to form a multi-feedback loop.
  • the driving current of each LED drive stage is referred to in order for the driving currents of the previous LED emitter to become zero.
  • the voltage should increase as the number of stages increases. Accordingly, only the configuration in which the light emission driving current increases as the number of LED driving stages increases.
  • the light emission current reference voltage of the next stage is lower than the reference voltage of the previous stage, the light emission current of the stage is always turned off. For example, when the three-stage luminous current reference voltage is less than the two-stage luminous reference voltage, the three-stage luminous current is always off.
  • the step-up / down AC LED driver 21 of the present embodiment operates normally even if the light emitting drive current is arbitrarily increased or decreased as the number of LED driving stages increases.
  • Equation 1 the terminal voltage of each stage voltage output terminal from Equation 1 may be represented by Equations 2 to 5 below. .
  • the step-up / down AC LED driver 21 is implemented as a light emitting current controller that supplies a corresponding driving current to the light emitting diode module 320 when the light emitting unit that emits light varies according to the magnitude of the AC input power voltage. Can be.
  • the light emitting current controller is configured to contact each contact between the mth (1 ⁇ m ⁇ n-1) th light emitting diode part and the (m + 1) th light emitting diode part, and the nth light emitting diode not contacting the (n-1) th light emitting diode part.
  • the driving current and the nth driving current flowing between the nth LED unit and the other end of the input power source are controlled.
  • the light emitting current control unit receives a first driving current for driving the first light emitting diode unit from the discharge current when the input power supply voltage is smaller than the charging voltage.
  • the driving current is supplied to the n-light emitting diode unit, but the input power supply voltage is increased enough to turn on the k-th LED unit (2 ⁇ k ⁇ n-1)
  • the first to (k-1) th driving currents are turned off to
  • the k driving current is controlled to flow from the input power supply through the first to k th light emitting diode parts, and the size thereof decreases as the number of LEDs emitting as the k th light emitting diode part is additionally turned on in response to an increase in the input power supply voltage.
  • the k-th driving current is driven to control the flicker of the light output of the light emitting diode unit to be attenuated.
  • the light emitting diode module includes first to nth light emitting diode units sequentially connected to an AC input power source, where n is a natural number of two or more, and the step-up / down AC LED driver 21 Includes first to nth light emitting current drivers connected to one end of the first to nth light emitting diode units, respectively.
  • the step-up / down AC LED driver 21 determines the light emission driving current of the first to nth light emitting current driving units according to the second reference voltage and the first to nth light emitting current setting resistance values.
  • the first to n-th light emitting current driving units included in the step-up / down AC LED driver 21 are connected to one end of each light emitting diode unit included in the light emitting diode module 320 to drive a driving current to drive each light emitting diode unit. Supply.
  • each of the first to nth light emitting current drivers is applied with a second reference voltage, and the first light emitting current driver is fed back from the voltage output terminal of the second to nth light emitting current drivers to a corresponding input terminal of the first light emitting current driver.
  • the kth (1 ⁇ k ⁇ n, k is a natural number) light emitting current driving unit is fed back from the voltage output terminal of the (k + 1) to the nth light emitting current driving unit to the corresponding input terminal of the kth light emitting current driver.
  • the step up / down AC LED driver 21 of the present embodiment changes the voltage of the previous stage voltage output terminal only by the voltage of each stage voltage output terminal when the AC input voltage is increased and the number of LED emitting stages is increased.
  • the resistance value of each stage driving current setting resistor R1 ⁇ R4 can be set so that each stage driving current has an arbitrary value.
  • the step-up / down AC LED driver 21 of the present embodiment is different from the general AC LED drivers 130 and 230, so that the number of LEDs emitting light increases as the AC input voltage increases. In this case, it can be configured to reduce each stage driving current value in response to the higher light output, thereby implementing a flicker-free AC LED lighting system.
  • the resistance values of the driving current setting resistors R1 to R4 are also configured to increase.
  • the resistance values of the driving current setting resistors R1 to R4 are also configured to increase.
  • the resistance value of the drive current setting resistors R1 to R4 so that each stage driving current arbitrarily increases or decreases when the number of LEDs emitting light increases as the AC input voltage increases.
  • FIG. 8 shows a parallel driving method of the present embodiment for constructing an AC LED lighting system having high LED output power while using only two valley fill capacitors.
  • the LED output power is large, the required valley fill capacitor charge current will also increase, resulting in increased power consumption of the SoC, which can significantly increase the package temperature. If the CN2 terminals of the two chips are connected as shown in FIG. 8 and the valley fill charging current setting resistor R5 is configured to have the same value, the valley fill capacitor of the SoC is excessively supplied because only half of the valley fill capacitor charging current is supplied from the two chips. It can prevent the increase.
  • FIGS 9A to 9C are diagrams showing operational waveforms of the flicker-free AC LED lighting system of the present embodiment.
  • Figure 9a is a diagram showing the AC input voltage and the current waveform
  • Figure 9b is a view showing the LED light emitting unit input voltage, the input current and the output current of each single light emitting current driver
  • Figure 9c is the LED light emitting unit input voltage, input current And a charge current of the active valley fill circuit 10.
  • FIG. 10A shows the LED light emitting unit input voltage, the input current and the output current of each single light emitting current driver when the single light emission current increases as the short current increases in the flicker-free AC LED lighting system of the present embodiment.
  • 10B is a diagram showing the LED light emitting unit input voltage, the input current, and the output current of each single light emitting current driver when the single light emitting current is configured to increase or decrease arbitrarily.
  • FIG. 11 converts the LED light output to voltage through the LED emitter input voltage, the input current, and the photo coupler when each single emission current value is set such that the flicker index is zero, that is, a constant light output.
  • the light output is a constant flicker-free AC LED drive.
  • the universal AC LED SoC of the present embodiment can implement a low cost, high reliability AC LED lighting system to meet various market demands, and specifically, implement a flicker-free AC LED lighting system. This is possible.
  • the flicker-free AC LED lighting system 300 of the present embodiment provides a system that can almost solve the flicker, which is the biggest problem of the AC LED lighting system of general technology, and also provides the electrical characteristics such as THD and the like.
  • the AC LED lighting system can also be configured with well coordinated flicker index characteristics.
  • the flicker-free AC LED lighting system 300 of the present embodiment may be configured to operate in the same manner as the valley fill AC LED lighting system 200 of the general technique, and the active valley fill circuit 10 of the present embodiment By controlling the valley fill capacitor charge current, the THD and EMI characteristics can be better than conventional technologies.
  • the active valley fill circuit 10 of the present embodiment requires five diodes as compared to the conventional valley fill circuit 250.
  • the diode and the valley fill charging controller 26 for providing a discharge path of the second valley fill capacitor are provided.
  • a diode is added to prevent the parasitic diode operation.
  • the flicker-free AC LED lighting system 300 of the present embodiment may be configured to reduce the respective luminous current for flicker-free implementation when the number of LED emitters emitting light is increased by increasing the AC input voltage. Alternatively, it may be configured to increase, or may be configured to increase or decrease in any manner.
  • the flicker-free AC LED lighting system 300 of the present embodiment may use the step up / down AC LED driver 21 of the present embodiment. Provide more.
  • the flicker-free AC LED lighting system 300 of the present embodiment further provides the active valley fill circuit 10 and the step up / down AC LED driver 21 of the present embodiment to provide the AC LED lighting system according to various market demands. It is a universal AC LED lighting system that can provide.
  • the flicker-free AC LED lighting system 300 of the present embodiment described above can be configured in any number of ways.
  • the diodes of the active valley fill circuit 10 of the present embodiment are the universal AC LED SoC of the present embodiment.
  • 330 may be implemented as a discrete element instead of inside, and in the flicker-free AC LED lighting system 300 of the present embodiment, the flicker-free characteristic is implemented when the number of LED loads emitting light is increased by increasing the AC input voltage.
  • the circuit of the step-up / down AC LED driver 21 of this embodiment which is provided in detail in FIG. 7 so that each single emission drive current can be reduced, may be configured in any other way, and even the emission current may be It may be configured such that only a reduction is possible in response to an increase in the number of light emission stages.
  • each single emission driving current is reduced in such a manner as to be configured. It must be clear that it should be protected.
  • full-wave rectifier 220 light emitting unit
  • AC LED driver 240 reference voltage generator
  • bias circuit 26 active valley fill charging control
  • LED1 1 stage light emitting unit
  • LED2 2 stage light emitting unit
  • LED3 three-stage light emitting part
  • LED4 four-stage light emitting part
  • VLED1 1 stage light emitter on voltage
  • VLED2 2 stage light emitter on voltage
  • VLED3 3-stage emitter on voltage
  • VLED4 4-stage emitter on voltage
  • CV1 first valleyfill capacitor
  • CV2 second valleyfill capacitor
  • S3 3-stage current output terminal
  • S4 4-stage current output terminal
  • RS3 3-stage voltage output terminal
  • RS4 4-stage voltage output terminal
  • CN1 negative input terminal of the first valleyfill capacitor of the active valleyfill circuit
  • CN2 negative input terminal of the second valleyfill capacitor of the active valleyfill circuit
  • VDD Regulator output terminal
  • ADIM Analog dimming input terminal
  • VN Ground terminal
  • R1 One-stage drive current setting resistor
  • R2 Two-stage drive current setting resistor
  • R3 3-stage drive current setting resistor
  • R4 4-stage drive current setting resistor
  • VAC AC input voltage
  • IAC AC input current
  • I1 1st stage drive current
  • I2 2nd stage drive current
  • I3 three stage drive current
  • I4 four stage drive current
  • VREF1 Single-Level Voltage Reference for AC LED Driver
  • VREF2 Two-Level Voltage Reference for AC LED Driver

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)

Abstract

Le présent mode de réalisation de l'invention vise à proposer un système d'éclairage à LED CA exempt de scintillement, peu coûteux et extrêmement fiable sans qu'il soit nécessaire d'utiliser un transistor MOSFET côté haut et un pilote de grille, et à proposer un système d'éclairage à LED CA exempt de scintillement qui n'utilise qu'un seul système SoC à LED CA universel pour la mise en œuvre du procédé.
PCT/KR2015/011119 2014-11-28 2015-10-21 Système d'éclairage à led ca exempt de scintillement WO2016085124A1 (fr)

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KR10-2014-0168880 2014-11-28
KR1020140168880A KR101566515B1 (ko) 2014-11-28 2014-11-28 플리커-프리 ac led 조명 시스템

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WO2016085124A1 true WO2016085124A1 (fr) 2016-06-02

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EP4297532A1 (fr) * 2022-06-23 2023-12-27 Sanube GmbH Bande lumineuse et procédé de mise en marche et hors tension d'une bande lumineuse

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KR20130076710A (ko) * 2011-12-28 2013-07-08 아이와트 인크. Led 드라이버를 위한 전력 변환 장치의 예측 제어
WO2014058196A2 (fr) * 2012-10-08 2014-04-17 서울반도체 주식회사 Appareil d'alimentation de diode électroluminescente et procédé d'alimentation pour l'alimentation continue d'une diode électroluminescente
KR20140050955A (ko) * 2012-10-22 2014-04-30 주식회사 디엠비테크놀로지 Ｄｉｒｅｃｔ ＡＣ ＬＥＤ 구동 장치 및 구동 방법
KR20140107839A (ko) * 2013-02-28 2014-09-05 주식회사 실리콘웍스 발광 다이오드 조명 장치의 제어 회로

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113366920A (zh) * 2019-01-25 2021-09-07 昕诺飞控股有限公司 照明驱动器和驱动方法
CN113366920B (zh) * 2019-01-25 2024-06-11 昕诺飞控股有限公司 照明驱动器和驱动方法
EP4297532A1 (fr) * 2022-06-23 2023-12-27 Sanube GmbH Bande lumineuse et procédé de mise en marche et hors tension d'une bande lumineuse

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