WO2016093534A1 - Circuit d'attaque de del à performances de papillotement améliorées, et dispositif d'éclairage à del le comprenant - Google Patents

Circuit d'attaque de del à performances de papillotement améliorées, et dispositif d'éclairage à del le comprenant Download PDF

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Publication number
WO2016093534A1
WO2016093534A1 PCT/KR2015/012958 KR2015012958W WO2016093534A1 WO 2016093534 A1 WO2016093534 A1 WO 2016093534A1 KR 2015012958 W KR2015012958 W KR 2015012958W WO 2016093534 A1 WO2016093534 A1 WO 2016093534A1
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WIPO (PCT)
Prior art keywords
led
led group
driving
group
current
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PCT/KR2015/012958
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English (en)
Korean (ko)
Inventor
정영도
진성호
한상욱
정혜만
Original Assignee
서울반도체 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Priority claimed from KR1020140179485A external-priority patent/KR102309840B1/ko
Priority claimed from KR1020150121219A external-priority patent/KR102449566B1/ko
Priority claimed from KR1020150161890A external-priority patent/KR102427793B1/ko
Application filed by 서울반도체 주식회사 filed Critical 서울반도체 주식회사
Priority to US15/322,005 priority Critical patent/US10187945B2/en
Priority to DE212015000282.9U priority patent/DE212015000282U1/de
Priority to EP15868227.8A priority patent/EP3232739A4/fr
Publication of WO2016093534A1 publication Critical patent/WO2016093534A1/fr
Priority to US15/475,003 priority patent/US10321529B2/en

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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
    • 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
    • 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
    • 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

Definitions

  • the present invention relates to an LED driving circuit having improved flicker performance and an LED lighting device including the same. More specifically, in the LED sequential driving method of the AC sequential driving method, by eliminating the LED off period, LED drive circuit with improved flicker performance, which can reduce the light output deviation of the LED lighting device generated during the operation period and the same It relates to an LED lighting device comprising.
  • LED driving is generally DC driving.
  • AC-DC converters such as SMPS are indispensable in the case of direct current driving, and these power converters increase the manufacturing cost of the lighting fixture, make it difficult to miniaturize the lighting fixture, reduce the energy efficiency of the lighting fixture, and short lifespan. Due to this there is a problem that shortens the life of the lighting fixture.
  • the circuit according to this technology not only has a problem that the power factor is lowered due to a mismatch between the input voltage and the current output from the LED, but also when the non-emitting period of the LED becomes longer, the flicker that the user perceives flickering light. There is a problem that the phenomenon occurs.
  • FIG. 1 is a conceptual diagram for describing flicker performance.
  • the definition and regulation of flicker which is the standard of flicker performance of the recent Energy Star specification (SPEC), are as follows.
  • Flicker refers to a phenomenon in which the brightness of the light changes for a certain period of time, and in severe cases, the user may notice a phenomenon in which the light shakes or flickers. Most of these flickers are caused by a difference between the maximum light output and the minimum light output for a certain time.
  • the flicker index is a light output waveform diagram of one cycle, obtained by dividing an area (Area 1) having an average light output or more by the total light output area (Area 1 + Area 2). It means the value. Therefore, the flicker index is a numerical value indicating how much light above the average light output is generated in one cycle. The lower the flicker index, the better the flicker level.
  • Percent Flicker refers to an indicator that quantifies the minimum and maximum amount of light over a period of time. This percentage flicker can be calculated as 100 * (maximum light amount-minimum light amount) / (maximum light amount + minimum light amount).
  • Percent Flicker ⁇ 0.033 x 2 x Frequency is an unaffected interval.
  • Percent flicker ⁇ 0.033 x 2 x frequency or less is reported as a low risk interval.
  • the flicker level is emerging as an important criterion in the performance of the LED lighting device.
  • Figure 2 is a schematic block diagram of a four-stage sequential driving LED lighting apparatus according to the prior art
  • Figure 3 is a driving voltage vs. LED driving current of the four-stage sequential driving LED lighting apparatus according to the prior art disclosed in FIG.
  • the LED lighting apparatus 100 may include a rectifying unit 10, an LED light emitting unit 20, and an LED driving controller 30.
  • the rectifying unit 10 of the LED lighting device 100 rectifies the AC voltage (V AC ) input from the external power source to generate a rectified voltage (Vrec), the generated rectified voltage (Vrec) LED emitting unit And an output to the LED drive control unit 30.
  • the rectifier 10 one of various known rectifier circuits such as a full-wave rectifier circuit and a half-wave rectifier circuit may be used.
  • FIG. 2 shows a bridge full-wave rectifier circuit composed of four diodes D1, D2, D3, and D4. It is.
  • the LED light emitting unit 20 according to the prior art is composed of four LED groups from the first LED group 21 to the fourth LED group 24, sequentially under the control of the LED drive control unit 30 It is turned on and turned off sequentially.
  • the LED driving controller 30 according to the related art is configured to perform a control function of sequentially turning on and off the first LED group 21 to the fourth LED group 24 according to the voltage level of the rectified voltage Vrec. do.
  • the LED driving controller 30 is configured to perform a constant current control function for each sequential driving section by increasing or decreasing the LED driving current according to the voltage level of the input voltage (that is, the rectified voltage Vrec). It is to improve the power quality of the LED lighting device by improving the power factor (PF) and total harmonics distortion (THD) by allowing the driving current to have a stepped wave shape close to the sine wave.
  • PF power factor
  • TDD total harmonics distortion
  • the LED driving controller 30 includes a first constant current switch SW1, a second constant current switch SW2, and a third constant current switch in order to control the sequential driving of the LED groups. (SW3), and the fourth constant current switch (SW4).
  • the LED driving controller 30 according to the related art has a first voltage in a section (first stage operating section) in which the rectified voltage Vrec is greater than or equal to the first forward voltage level Vf1 and less than the second forward voltage level Vf2. turn-only LED group (21) is turned on and the constant current control so that the 1 LED drive current (I LED1), the LED driving current (I LED).
  • the LED driving controller 30 in a section (second stage operation period) in which the rectified voltage Vrec is greater than or equal to the second forward voltage level Vf2 and less than the third forward voltage level Vf3, By turning off the first constant current switch SW1 and turning on the second constant current switch SW2, only the first LED group 21 and the second LED group 22 are turned on and the LED driving current I LED is turned on. ) Is controlled to be a constant current to become the second LED driving current (I LED2 ).
  • the second driving section 30 includes the second rectifying voltage Vrec equal to or greater than the third forward voltage level Vf3 and less than the fourth forward voltage level Vf4 (the third stage operating section).
  • the LED driving controller 30 By turning off the constant current switch SW2 and turning on the third constant current switch SW3, the first LED group 21 to the third LED group 23 are turned on and the LED driving current I LED is turned on. Control the constant current to the third LED driving current (I LED3 ).
  • the LED driving controller 30 turns off the third constant current switch SW3 in a section (fourth stage operating period) in which the rectified voltage Vrec is greater than or equal to the fourth forward voltage level Vf4. And turn on the fourth constant current switch SW4 to turn on all of the first LED group 21 to the fourth LED group 24 and turn on the LED driving current I LED to the fourth LED driving current I. LED4 ) to control the constant current. As shown in FIG.
  • the LED driving current (ie, the second LED driving current) in the second stage operating period than the LED driving current (ie, the first LED driving current I LED1 ) in the first stage operating section. (I LED2 )) is controlled to be larger, and likewise, the third LED driving current (I LED3 ) is controlled to be larger than the second LED driving current (I LED2 ), and the fourth LED driving current (I LED4 ) is the most. It is controlled to be large. Accordingly, the total light output of the LED lighting apparatus 100 according to the prior art has a stepped wave shape as shown in FIG.
  • the LED lighting apparatus 100 since the total number and the driving current of the LEDs emitted according to the operation section is different, the light output is different for each operation section, and thus the user outputs the light for each operation section. There is a problem that the discomfort due to the difference, and the flicker as described above is poor. That is, in the case of the LED lighting apparatus of the sequential driving method according to the prior art as described above, the situation is needed to improve because the percentage flicker reaches 100%.
  • the LED lighting apparatus 100 is configured to control the sequential driving based on the driving voltage provided to the LED light emitting unit 20, that is, the voltage level of the rectified voltage Vrec. have.
  • a voltage detection method there is a problem that does not properly reflect the current / voltage characteristics according to the LED temperature. That is, although the forward voltage of the LED group differs according to the "operating temperature of the LED,” the voltage detection method does not properly reflect the I / V characteristics according to the temperature of the LED. For example, a phenomenon in which the LED driving current (LED light output) drops or overlaps momentarily occurs at the time when the first stage is changed from the second stage to the second stage. The problem is that the output is not constant.
  • the present invention is to solve the problems of the prior art as described above.
  • the present invention provides an LED sequential drive type LED lighting device, LED driver circuit and improved LED flicker performance, which can provide a natural light to the user by removing the non-emitting section to reduce the deviation of the light output It is an object of the present invention to provide a lighting device.
  • the LED sequential drive type LED lighting apparatus by controlling the magnitude of the LED driving current supplied to the LED based on the number of LEDs to be lighted for each operating period, the light output of the LED lighting apparatus generated during the operating period
  • Another object of the present invention is to provide an LED driving circuit having improved flicker performance and an LED lighting device including the same, which can reduce deviation.
  • the present invention is to provide a LED drive circuit with improved flicker performance, and LED lighting apparatus including the same that can provide a constant light output by controlling the sequential driving between the LED groups based on the LED drive current detection method. Another purpose.
  • the present invention is an LED sequential drive type LED lighting device, the LED drive circuit with improved flicker performance, which can increase the circuit efficiency and increase the amount of light by using a loopback compensation unit capable of double discharge through a double discharge path And another object to provide an LED lighting device comprising the same.
  • a rectifying unit is connected to an AC power source rectified by a full-wave rectification, and provides a full-wave rectified rectified voltage as a first driving voltage to the LED light emitting unit; And a first LED group to an nth LED group (n is a positive integer of 2 or more), and receive the rectified voltage from the rectifying unit as the first driving voltage in a non-compensation section to emit light, and loopback in a compensation section.
  • An LED light emitting unit which receives the second driving voltage from the compensating unit and emits light; One end is connected to the cathode end of any one of the LED group of the first LED group to the n-1 LED group through a charging path, the one end is the first LED group to n-1 LED group through a discharge path It is further connected to the anode end of any one of the LED group, the other end is connected to the LED drive control unit, and charges energy using the rectified voltage in the charging section, the second driving unit in the compensation section in the LED driving section A loop-back compensator for providing a voltage; And detecting the LED driving current flowing through the constant current switches respectively connected to the first LED group to the nth LED group, and controlling sequential driving of the first LED group to the nth LED group according to the detected LED driving current.
  • an LED lighting device comprising an LED drive control.
  • the loopback compensator may be connected to an anode terminal of the first LED group to provide a second driving voltage to the first LED group of the compensation period.
  • the LED driving control unit sets the LED driving current (first LED driving current to n-th LED driving current) value for each operation section based on the total number of LEDs emitted for each operation section, and sets the LED for each operation section.
  • the constant current control of the LED driving current in the corresponding operation section according to the driving current value, the first LED driving current to the n-th LED driving current may be set in such a way that is sequentially reduced.
  • the LED driving control unit sets the LED driving current (first LED driving current to n-th LED driving current) value for each operation section so as to be inversely proportional to the total number of LEDs emitted for each operation section, and the LED for each operation section is set.
  • the driving current value it may be configured to control the constant current of the LED driving current in the corresponding operation section.
  • the LED light emitting unit includes a first LED group and a second LED group, wherein the light output of the first LED group during the first operating period and the first LED group and the second during the second operating period.
  • the difference between the light outputs of the LED groups may be configured to be equal to or less than a preset light output deviation.
  • the first LED light emitting unit may include a first LED group and a second LED group, and the second driving voltage may be configured to be equal to or higher than a forward voltage level of the first LED group.
  • the first LED light emitting unit includes a first LED group and a second LED group, and the peak value of the rectified voltage may be configured to be at least two times the forward voltage level of the first LED group.
  • the LED driving control unit further includes a first LED driving current setting unit to n-th LED driving current setting unit that can set the corresponding LED driving current value among the first LED driving current value to the n-th LED driving current value, respectively. can do.
  • each of the first LED driving current setting unit to the nth LED driving current setting unit may be configured of a variable resistor.
  • the LED driving controller is connected to the cathode terminal of each of the first LED group to the n-th LED group, respectively, to connect or disconnect the first current path to the n-th current path according to the operation period, It may include a first constant current switch to the n th constant current switch for controlling the constant current of the LED driving current in the operation period.
  • the LED driving control unit is located between the loopback compensation unit and the LED driving control unit to connect or disconnect the n + 1 current path between the loopback compensation unit and the LED driving control unit, and in the charging section And an n + 1 constant current switch configured to control the n + 1 LED driving current.
  • the LED driving controller detects charging current flowing through the n + 1 constant current switch connected to the loopback compensator to determine whether to enter or leave a charging section, and sets the nth constant current switch at a charging section entry time.
  • the electronic device may be configured to turn off and turn on the n-th constant current switch at the time of leaving the charging section.
  • the LED driving controller turns on the n + 1 constant current switch connected to the loopback compensator at the time when the rectifying voltage rises to enter the n-th operating period from the n-th operating period. Detects the charging current flowing through, and if the detected charging current rises above a predetermined value, by turning off the n-th constant current switch to turn off the n-th LED group and enters the charging section, enters the charging section Afterwards, when the detected charging current falls below a preset value, the n-th constant current switch may be turned on to turn on the n-th LED group again to enter the n-th operation section.
  • the n + 1 LED driving current value may be set equal to the n ⁇ 1 th driving current value.
  • the LED light emitting unit may include a first LED group and a second LED group, and the forward voltage level of the first LED group may be configured to be greater than the forward voltage level of the second LED group.
  • the LED lighting device is located between the node between the n-th LED group and the n-th LED group and the loopback compensator to be turned on or turned off under the control of the LED driving controller.
  • an n + 2 switch wherein the LED driving controller turns on the n + 2 switch at an entry point of the nth operation section and turns off the n + 2 switch at an entry point of the compensation section. It can be configured to.
  • the LED lighting device is connected in parallel to the n-th LED group, and supplies a driving voltage to the n-th LED group during a non-light-emitting period that is charged during the n-th operating period and the n-th LED group does not emit light.
  • a second compensation unit may be further included.
  • the loopback compensator is connected in parallel to the nth LED group, and the other end of the loopback compensator is connected to the driving controller through the nth constant current switch in common with the cathode of the nth LED group.
  • the first LED light emitting unit includes a first LED group and a second LED group, and the forward voltage level of the first LED group may be configured to be less than or equal to the forward voltage level of the second LED group.
  • the LED light emitting unit includes a first LED group, a second LED group, and a third LED group, wherein the loopback compensator is connected in parallel with the second LED group and the third LED group, and one end of the loopback compensator is And connected to an anode end of the first LED group, and configured to be charged during the second and third operating periods and provide the second driving voltage to the first LED group in the compensation period.
  • the LED light emitting unit may include a dummy load instead of the third LED group.
  • the LED lighting device is connected in parallel to the n-th LED group, and the driving voltage is applied to the n-th LED group during the non-light emitting period that is charged during the n-th operation period and the n-th LED group does not emit light. It may further include a second compensation unit for supplying.
  • the LED lighting device is connected in series to the n-th LED group, the non-light emitting period in which the voltage level of the rectified voltage is equal to or greater than the nth forward voltage level, the n-th LED group does not emit light
  • a second compensator configured to supply a driving voltage to the nth LED group through a discharge path connected in parallel to the nth LED group.
  • the LED light emitting unit includes a first LED group, a second LED group and a third LED group, a node between the second LED group and the third LED group is connected to the cathode end of the rectifying unit,
  • the loopback compensator is connected in parallel with the second LED group and the third LED group, one end of the loopback compensator is connected to the anode end of the first LED group, and is charged during the second operation period and the third operation period, and the discharge It may be configured to supply the second driving voltage to the first LED group and the third LED group during the interval.
  • driving the LED light emitting unit including the first LED group to n-th LED group (n is a positive integer of 2 or more) and receives the rectified voltage full-wave rectified from the rectifying unit as the first driving voltage.
  • An LED driving circuit for controlling one end is connected to the cathode end of any one of the LED group of the first LED group to the n-1 LED group through a charging path, the one end is the first LED group through a discharge path It is further connected to the anode end of any one of the n-1 LED group of the LED group, the other end is connected to the LED driving control unit, charging the energy using the rectified voltage in the charging section, the LED in the compensation section
  • a loop-back compensator configured to provide the second driving voltage to a light emitting part; And detecting the LED driving current flowing through the constant current switches respectively connected to the first LED group to the nth LED group, and controlling sequential driving of the first LED group to the nth LED group according to the detected LED driving current.
  • the loopback compensator may be connected to an anode terminal of the first LED group to provide a second driving voltage to the first LED group of the compensation period.
  • the LED driving control unit sets the LED driving current (first LED driving current to n-th LED driving current) value for each operation section based on the total number of LEDs emitted for each operation section, and sets the LED for each operation section.
  • the constant current control of the LED driving current in the corresponding operation section according to the driving current value, the first LED driving current to the n-th LED driving current may be set in such a way that is sequentially reduced.
  • the LED driving control unit sets the LED driving current (first LED driving current to n-th LED driving current) value for each operation section so as to be inversely proportional to the total number of LEDs emitted for each operation section, and the LED for each operation section is set.
  • the driving current value it may be configured to control the constant current of the LED driving current in the corresponding operation section.
  • the LED light emitting unit includes a first LED group and a second LED group, wherein the light output of the first LED group during the first operating period and the first LED group and the second during the second operating period.
  • the difference between the light outputs of the LED groups may be configured to be equal to or less than a preset light output deviation.
  • the first LED light emitting unit may include a first LED group and a second LED group, and the second driving voltage may be configured to be equal to or higher than a forward voltage level of the first LED group.
  • the first LED light emitting unit includes a first LED group and a second LED group, and the peak value of the rectified voltage may be configured to be at least two times the forward voltage level of the first LED group.
  • the LED driving control unit further includes a first LED driving current setting unit to n-th LED driving current setting unit that can set the corresponding LED driving current value among the first LED driving current value to the n-th LED driving current value, respectively. can do.
  • each of the first LED driving current setting unit to the nth LED driving current setting unit may be configured of a variable resistor.
  • the LED driving controller is connected to the cathode terminal of each of the first LED group to the n-th LED group, respectively, to connect or disconnect the first current path to the n-th current path according to the operation period, It may include a first constant current switch to the n th constant current switch for controlling the constant current of the LED driving current in the operation period.
  • the LED driving control unit is located between the loopback compensation unit and the LED driving control unit to connect or disconnect the n + 1 current path between the loopback compensation unit and the LED driving control unit, and in the charging section And an n + 1 constant current switch configured to control the n + 1 LED driving current.
  • the LED driving controller detects charging current flowing through the n + 1 constant current switch connected to the loopback compensator to determine whether to enter or leave a charging section, and sets the nth constant current switch at a charging section entry time.
  • the electronic device may be configured to turn off and turn on the n-th constant current switch at the time of leaving the charging section.
  • the LED driving controller turns on the n + 1 constant current switch connected to the loopback compensator at the time when the rectifying voltage rises to enter the n-th operating period from the n-th operating period. Detects the charging current flowing through, and if the detected charging current rises above a predetermined value, by turning off the n-th constant current switch to turn off the n-th LED group and enters the charging section, enters the charging section Afterwards, when the detected charging current falls below a preset value, the n-th constant current switch may be turned on to turn on the n-th LED group again to enter the n-th operation section.
  • the n + 1 LED driving current value may be set equal to the n ⁇ 1 th driving current value.
  • the LED light emitting unit includes a first LED group and a second LED group
  • the forward voltage level of the first LED group may be configured to be larger than the forward voltage level of the second LED group.
  • the LED driving circuit is located between the node between the n-th LED group and the n-th LED group and the loopback compensator to be turned on or turned off under the control of the LED driving controller.
  • an n + 2 switch wherein the LED driving controller turns on the n + 2 switch at an entry point of the nth operation section and turns off the n + 2 switch at an entry point of the compensation section. It can be configured to.
  • the LED driving circuit is connected in parallel to the n-th LED group, and supplies a driving voltage to the n-th LED group during a non-light-emitting period that is charged during the n-th operating period and the n-th LED group does not emit light.
  • a second compensation unit may be further included.
  • the loopback compensator is connected in parallel to the nth LED group, and the other end of the loopback compensator is connected to the driving controller through the nth constant current switch in common with the cathode of the nth LED group.
  • the first LED light emitting unit includes a first LED group and a second LED group, and the forward voltage level of the first LED group may be configured to be less than or equal to the forward voltage level of the second LED group.
  • the LED light emitting unit includes a first LED group, a second LED group, and a third LED group, wherein the loopback compensator is connected in parallel with the second LED group and the third LED group, and one end of the loopback compensator is And connected to an anode end of the first LED group, and configured to be charged during the second and third operating periods and provide the second driving voltage to the first LED group in the compensation period.
  • the LED light emitting unit may include a dummy load instead of the third LED group.
  • the LED driving circuit is connected in parallel to the n-th LED group, and the driving voltage is applied to the n-th LED group during the non-light-emitting period that is charged during the n-th operation period and the n-th LED group does not emit light. It may further include a second compensation unit for supplying.
  • the LED driving circuit is connected to the n-th LED group in series, the non-light emitting period in which the voltage level of the rectified voltage is equal to or greater than the nth forward voltage level, the n-th LED group does not emit light
  • a second compensator configured to supply a driving voltage to the nth LED group through a discharge path connected in parallel to the nth LED group.
  • the LED light emitting unit includes a first LED group, a second LED group and a third LED group, a node between the second LED group and the third LED group is connected to the cathode end of the rectifying unit,
  • the loopback compensator is connected in parallel with the second LED group and the third LED group, one end of the loopback compensator is connected to the anode end of the first LED group, and is charged during the second operation period and the third operation period, and the discharge It may be configured to supply the second driving voltage to the first LED group and the third LED group during the interval.
  • a rectifying unit is connected to the AC power source rectified by the full-wave rectification, and provides a full-wave rectified rectified voltage as the first driving voltage to the LED light emitting unit; And a first LED group and a second LED group, wherein the rectified voltage is supplied as the first driving voltage from the rectifying unit in a non-compensation section to emit light, and a second driving voltage is supplied from the loopback compensating unit in a compensation section.
  • An LED light emitting unit to receive light Located between the node between the first LED group and the second LED group and the LED driving control unit, the energy is charged by using the rectified voltage in the charging section (first operation section), the first compensation section in the first section
  • a loopback compensation unit configured to provide the second driving voltage to the LED group and the second LED group; And detecting the LED driving current flowing through the constant current switches respectively connected to the first LED group and the second LED group, and performing deformation sequential driving of the first LED group and the second LED group according to the detected LED driving current.
  • a LED driving controller to control the LED driving controller to determine whether the charging section enters or leaves the charging section by detecting the charging current flowing through the constant current switch connected to the loopback compensator.
  • An LED lighting device is disclosed, which turns off a constant current switch connected to the switch, and turns on the constant current switch connected to the second LED group at the time of leaving the charging section.
  • an LED driving circuit including a first LED group and a second LED group, the LED driving circuit for controlling the driving of the LED light emitting unit is provided as a first driving voltage rectified voltage rectified from the rectifying unit, Located between the node and the LED driving control unit between the first LED group and the second LED group, and charges energy using the rectified voltage in a charging section (first operating section), the first LED in the compensation section A loopback compensation unit configured to provide a second driving voltage to the group and the second LED group; And detecting the LED driving current flowing through the constant current switches respectively connected to the first LED group and the second LED group, and performing deformation sequential driving of the first LED group and the second LED group according to the detected LED driving current.
  • a LED driving controller to control the LED driving controller to determine whether the charging section enters or leaves the charging section by detecting the charging current flowing through the constant current switch connected to the loopback compensator.
  • An LED driving circuit is disclosed, which turns off the constant current switch connected to the switch, and turns on the constant current switch connected to the second LED group at the time of leaving the charging section.
  • a rectifying unit is connected to the AC power source rectified by the full-wave rectification, and provides a full-wave rectified rectified voltage as the first driving voltage to the LED light emitting unit; And a first LED group to an nth LED group (n is a positive integer of 2 or more), and receive the rectified voltage from the rectifying unit as the first driving voltage in a non-compensation section to emit light, and loopback in a compensation section.
  • An LED light emitting unit which receives the second driving voltage from the compensating unit and emits light; Located between the node between the mth LED group (m is a positive integer less than n) and the m + 1 LED group and the LED drive control unit, charging energy using the rectified voltage in the charging section, the compensation section Provide the second driving voltage to a second set of LED groups (m + 1 LED group to the nth LED group) during a first compensation interval of the second set of LEDs; A loop-back compensator for providing the second driving voltage to each of the LED group and the first set of LED groups (the first LED group to the mth LED group); And an LED driving controller for controlling driving of the first to nth LED groups according to the voltage level of the rectified voltage.
  • the loopback compensator may be configured to be connected to an anode end of the m + 1 LED group through a first discharge path and to an anode end of the first LED group through a second discharge path.
  • said first group of LED groups can be configured to be driven by said first drive voltage during said first compensation period.
  • the first set of LED groups and the second set of LED groups may be configured to be driven independently of each other.
  • the forward voltage level of the LED group of the first set may be configured to be less than or equal to the forward voltage level of the LED group of the second set.
  • the LED driving control unit further includes a first LED driving current setting unit to n-th LED driving current setting unit that can set the corresponding LED driving current value among the first LED driving current value to the n-th LED driving current value, respectively. can do.
  • each of the first LED driving current setting unit to the nth LED driving current setting unit may be configured of a variable resistor.
  • the driving of the LED light-emitting unit including the first LED group to the n-th LED group (n is a positive integer of 2 or more) and receives the rectified voltage full-wave rectified from the rectifying unit as the first driving voltage
  • An LED driving circuit for controlling the LED, the m LED group (m is a positive integer less than n) is located between the node between the m + 1 LED group and the LED drive control unit, using the rectified voltage in the charging section Charges energy, provides the second driving voltage to a second set of LED groups (the m + 1 LED group to the nth LED group) during the first compensation period, and generates the compensation period.
  • a loopback compensation unit configured to provide the second driving voltage to each of the second set of LED groups and the first set of LED groups (the first to mth LED groups) during a second compensation period; And an LED driving controller for controlling driving of the first to nth LED groups according to the voltage level of the rectified voltage.
  • the loopback compensator may be configured to be connected to an anode end of the m + 1 LED group through a first discharge path and to an anode end of the first LED group through a second discharge path. have.
  • said first group of LED groups can be configured to be driven by said first drive voltage during said first compensation period.
  • the first set of LED groups and the second set of LEDs may be configured to be driven independently of each other.
  • the forward voltage level of the LED group of the first set may be configured to be less than or equal to the forward voltage level of the LED group of the second set.
  • the LED driving control unit further includes a first LED driving current setting unit to n-th LED driving current setting unit that can set the corresponding LED driving current value among the first LED driving current value to the n-th LED driving current value, respectively. can do.
  • each of the first LED driving current setting unit to the nth LED driving current setting unit may be configured of a variable resistor.
  • an effect of providing natural light to a user may be expected by reducing a variation in light output by removing a non-light emitting section using a loop back compensation unit.
  • the LED sequential driving method of the AC sequential driving method by controlling the magnitude of the LED driving current supplied to the LED based on the number of LEDs to be lighted for each operation period, LED generated during the operation period The effect which can reduce the light output deviation of a lighting apparatus can be anticipated.
  • the present invention controls the sequential driving between the LED groups based on the LED driving current detection method LED lighting according to the prior art to control the sequential driving between the LED groups based on the LED driving voltage detection method
  • the effect can be expected to provide a constant light output that is further improved than the device.
  • 1 is a conceptual diagram for explaining flicker performance.
  • Figure 2 is a schematic block diagram of a four-stage sequential drive LED lighting apparatus according to the prior art.
  • FIG. 3 is a waveform diagram showing the relationship between the driving voltage and the LED driving current of the LED lighting apparatus according to the prior art shown in FIG.
  • FIG. 4 is a schematic block diagram of an LED lighting apparatus according to a first embodiment of the present invention.
  • 5A to 5D are block diagrams illustrating switch control states and LED driving currents according to operation sections of the LED lighting apparatus according to the first embodiment of the present invention shown in FIG.
  • FIG. 6 is a waveform diagram showing the relationship between the rectified voltage, the LED driving current, the input current, and the light output of the LED light emitting unit over time of the LED lighting apparatus according to the first embodiment of the present invention shown in FIG.
  • FIG. 7 is a schematic block diagram of an LED lighting apparatus according to a second embodiment of the present invention.
  • FIG. 8A to 8D are block diagrams illustrating switch control states and LED driving currents according to operation sections of the LED lighting apparatus according to the second embodiment of the present invention illustrated in FIG. 7.
  • FIG. 9 is a schematic block diagram of an LED lighting apparatus according to a third embodiment of the present invention.
  • FIG. 10 is a schematic structural block diagram of an LED lighting apparatus according to a fourth embodiment of the present invention.
  • FIG. 11 is a schematic structural block diagram of an LED lighting apparatus according to a fifth embodiment of the present invention.
  • 12A to 12C are block diagrams illustrating switch control states and LED driving currents according to operation sections of the LED lighting apparatus according to the fifth embodiment of the present invention shown in FIG.
  • FIG. 13 is a waveform diagram illustrating a relationship between rectified voltage, LED driving current, input current, and light output of the LED light emitting unit according to time of the LED lighting apparatus according to the fifth embodiment of the present invention shown in FIG. 11;
  • FIG. 14 is a schematic block diagram of an LED lighting apparatus according to a sixth embodiment of the present invention.
  • 15A to 15C are block diagrams illustrating switch control states and LED driving currents according to operation sections of the LED lighting apparatus according to the sixth embodiment of the present invention shown in FIG.
  • FIG. 16 is a waveform diagram illustrating the relationship between rectified voltage, LED driving current, input current, and light output of the LED light emitting unit according to time of the LED lighting apparatus according to the sixth embodiment of the present invention shown in FIG. 14;
  • FIG. 17 is a schematic structural block diagram of an LED lighting apparatus according to a seventh embodiment of the present invention.
  • FIG. 18 is a schematic block diagram of an LED lighting apparatus according to an eighth embodiment of the present invention.
  • FIG. 19 is a schematic block diagram of an LED lighting apparatus according to a ninth embodiment of the present invention.
  • FIG. 20 is a schematic structural block diagram of an LED lighting apparatus according to a tenth embodiment of the present invention.
  • 21 is a schematic block diagram of an LED lighting apparatus according to an eleventh embodiment of the present invention.
  • FIG. 22 is a schematic structural block diagram of an LED lighting apparatus according to a twelfth embodiment of the present invention.
  • FIG. 23 is a schematic block diagram of an LED lighting apparatus according to a thirteenth embodiment of the present invention.
  • 24A to 24D are block diagrams illustrating a switch control state for each operation section, a driving current for each LED group, and a charge / discharge current of the loopback compensation unit according to the thirteenth embodiment of the present invention shown in FIG. .
  • FIG. 25 illustrates a rectified voltage, a first LED group driving current, a second group LED driving current, and a loopback compensation unit charge / discharge current according to time of the LED lighting apparatus according to the thirteenth embodiment of the present invention shown in FIG. 23.
  • 26 is a schematic structural block diagram of an LED lighting apparatus according to a fourteenth embodiment of the present invention.
  • FIG. 27 is a schematic structural block diagram of an LED lighting apparatus according to a fifteenth embodiment of the present invention.
  • FIG. 28 is a schematic structural block diagram of an LED lighting apparatus according to a sixteenth embodiment of the present invention.
  • the term 'LED group' means that a plurality of LEDs (or a plurality of light emitting cells) are connected in series / parallel / parallel and parallel, so that the operation is controlled as one unit according to the control of the LED driving module. Means a set of LEDs that are (i.e. lit / turned off together).
  • first forward voltage level Vf1' refers to a threshold voltage level capable of driving the first group of LEDs
  • second forward voltage level Vf2' refers to a first LED group connected in series and Means a threshold voltage level capable of driving the second LED group (ie, the voltage level of the forward voltage level of the first LED group plus the forward voltage level of the second LED group), and the term 'third forward voltage level (Vf3).
  • 'Me ans a threshold voltage level capable of driving the first to third LED groups connected in series.
  • the 'nth forward voltage level Vfn' is a threshold voltage level capable of driving the first to nth LED groups connected in series (that is, the forward voltage level of the first LED group to the forward voltage of the nth LED group). Voltage level plus all levels).
  • the term 'sequential driving method of the driving voltage detector panel' or 'multi-stage driving method of the driving voltage detector panel' refers to an LED driving module that receives an input voltage that varies in magnitude over time and drives an LED.
  • the term 'sequential driving method of the driving current detector panel' or 'multi-stage driving method of the driving current detector panel' refers to an LED driving module that receives an input voltage whose magnitude changes with time, and drives an LED, A driving method of sequentially turning on and off the plurality of LED groups constituting the LED light emitting unit according to the increase or decrease of the LED driving current flowing through the constant current switch connected to the LED light emitting unit.
  • the first stage operation section means an operation section in which only the first LED group emits light
  • the second stage operation is performed.
  • the interval means an operation period in which only the first LED group and the second LED group emit light
  • the n-th operation period means an operation period in which both the first LED group and the n-th LED group emit light.
  • the term 'first driving voltage' refers to a driving voltage that is supplied to the LED groups primarily because the input voltage itself or the input voltage is uniformly processed (for example, through a process such as a rectifying circuit).
  • the term 'second driving voltage' refers to a driving voltage supplied second to the LED groups from the energy storage element after the input voltage is stored in the energy storage element.
  • the second driving voltage may be a driving voltage supplied to the LED groups from the charged capacitor after the input voltage is stored in the capacitor.
  • the term 'drive voltage' encompasses a first drive voltage and / or a second drive voltage supplied to the LED groups. It means.
  • the term 'LED group driving current' refers to the LED driving current flowing through a specific LED group regardless of the operating period.
  • the first LED group driving current refers to the LED driving current flowing through the first LED group
  • the second LED group driving current refers to the LED driving current flowing through the second LED group.
  • the nth LED group driving current means the LED driving current flowing through the nth LED group. LED group drive current can be changed over time.
  • the term 'LED driving current' refers to the driving current flowing through the LED group (s) in a specific operating period.
  • the first LED driving current means the LED driving current flowing during the first operating period
  • the second LED driving current means the LED driving current flowing during the second operating period.
  • the n-th LED driving current means the LED driving current flowing during the n-th operation period.
  • the LED driving current can be constant current controlled to a predetermined value by the constant current switch without changing with time.
  • the term 'first driving voltage' refers to a driving voltage that is supplied to the LED groups primarily because the input voltage itself or the input voltage is uniformly processed (for example, through a process such as a rectifying circuit).
  • the term 'second driving voltage' refers to a driving voltage supplied second to the LED groups from the energy storage element after the input voltage is stored in the energy storage element (eg, the loopback compensation unit).
  • the second driving voltage may be a driving voltage supplied to the LED groups from the charged capacitor after the input voltage is stored in the capacitor.
  • the term 'drive voltage' encompasses a first drive voltage and / or a second drive voltage supplied to the LED groups. It means.
  • the term 'compensation section' refers to a section in which the driving current is not supplied to the LED group as a section in which the voltage level of the input voltage (rectified voltage) is less than the predetermined forward voltage level.
  • the first forward voltage level Vf1 compensation section means a section in which the voltage level of the rectified voltage is less than Vf1.
  • the compensation section is a non-light emitting section.
  • the second forward voltage level Vf2 compensation section means a section in which the voltage level of the rectified voltage is less than Vf2. Therefore, the nth forward voltage level Vfn compensation section means a section in which the voltage level of the rectified voltage is less than Vfn.
  • first forward voltage level (Vf1) compensation means to supply a drive current to the LED group by supplying a second drive voltage to the LED group in the first forward voltage level (Vf1) compensation interval
  • second forward Voltage level Vf2 compensation means supplying a second driving voltage to the LED group in the second forward voltage level Vf2 compensation period. Therefore, the n th forward voltage level Vfn compensation means supplying the second driving voltage to the LED group in the n th forward voltage level Vfn compensation section.
  • the term 'first compensation interval' refers to the period in which the energy storage device provides the second driving voltage primarily to the LED group (s), and the 'second compensation interval' refers to the LED group (s).
  • the loopback compensation unit may supply the second driving voltage to the second LED group to the nth LED group primarily during the second forward voltage level Vf2 compensation period, and the first forward voltage level.
  • the second driving voltage may be secondarily supplied to the first to nth LED groups.
  • the first compensation section means a section in which the voltage level of the rectified voltage is less than Vf2
  • the second compensation section refers to a section in which the voltage level of the rectifying voltage is less than Vf1. Since the first compensation period and the second compensation period may be variously changed according to the design of the LED driving circuit, they should not be understood in an absolute sense.
  • the term 'set of LED groups' also refers to LED group (s) that receive a second drive voltage through the same discharge path (circuit) during a particular compensation period.
  • non-compensation section (normal operation section)' means a section in which the second driving voltage is not provided by the loopback compensator
  • 'charging section' means a section in which the loopback compensator is charged.
  • the non-compensation section and the charging section may be the same, or the charging section may be part of the non-compensation section.
  • V1, V2, V3, ..., t1, t2, ..., T1, T2, T3, etc. used to indicate any particular voltage, a specific time point, a specific temperature, etc. within the present specification. Is not used to represent an absolute value, but is a relative value used to distinguish one from another.
  • FIG. 4 is a schematic block diagram of an LED lighting device (hereinafter referred to as an LED lighting device) with improved flicker performance according to a first embodiment of the present invention.
  • an LED lighting device hereinafter referred to as an LED lighting device
  • FIG. 4 the configuration and function of the LED lighting apparatus 1000 according to the present invention will be briefly described with reference to FIG. 4.
  • the LED lighting apparatus 1000 As described above, in the case of a sequential drive AC LED lighting apparatus according to the prior art, since the LED groups are sequentially turned on and off according to the voltage level of the driving voltage supplied to the LED light emitting unit 20, In a section in which the voltage level of the voltage is less than the first forward voltage level Vf1, a non-light emitting section in which no LED group of the LED groups emits light occurs.
  • the number of LEDs that are turned on increases as the voltage level of the driving voltage supplied to the LED light emitting unit 20 increases, and is supplied to the LED light emitting unit 400. As the voltage level of the driving voltage decreases, the number of LEDs to be turned on decreases. Because of these characteristics of the sequential drive AC LED lighting device, there is a problem in particular that the flicker performance is poor.
  • the most basic technical idea of the present invention is to remove the LED light emitting unit 400 of the LED lighting apparatus 1000 during the operation of the LED lighting device 1000, that is, by removing the non-light emitting section, LED lighting It is to improve the flicker performance of the apparatus 1000.
  • the present invention proposes a loopback compensation unit, and by supplying a second driving voltage to the LED light emitting unit 400 in the non-light emitting period through the loopback compensation unit 300, And to remove the light emitting section.
  • the reason why the flicker performance is poor in the sequential drive AC LED lighting apparatus is that the LED driving current is controlled in proportion to the number of LEDs that are turned on for each operation section. Therefore, in order to solve this problem, the present invention proposes an LED lighting apparatus configured to control the LED driving current for each operation period in inverse proportion to the number of LEDs that are turned on for each operation period. Therefore, when the present invention adopts such an LED driving current control method, when the number of LEDs to be lighted according to the operation section is relatively small, the LED driving current in the corresponding operation section is relatively larger, and the number of LEDs to be lit is relatively.
  • the LED lighting apparatus 1000 may include a rectifier 200, a loopback compensator 300, an LED light emitter 400, and an LED driving controller 500. have.
  • the loopback compensator 300 and the LED driving controller 500 may configure the LED driving circuit.
  • the LED light emitting unit 400 may be composed of a plurality of LED groups, the plurality of LED groups included in the LED light emitting unit 400 is sequentially emitted under the control of the LED driving control unit 500, and sequentially Is turned off.
  • the LED light emitting unit 400 including the first LED group 410 and the second LED group 420 is illustrated in FIG. 4, the number of LED groups included in the LED light emitting unit 400 varies as necessary. It will be apparent to those skilled in the art that the present invention may be changed. However, hereinafter, for convenience of explanation and understanding, the LED light emitting unit 400 will be described based on the embodiment consisting of two LED groups, but the present invention is not limited thereto.
  • the LED light emitting unit 400 may be configured of four LED groups from the first LED group 410 to the fourth LED group (not shown), or the first LED group 410 to the Although it may consist of n LED groups up to the nth LED group (not shown), it will be apparent to those skilled in the art that the scope of the present invention is included as long as the technical gist of the present invention is included as it is.
  • the first LED group 410 and the second LED group 420 may have different forward voltage levels.
  • the first LED group 410 and the second LED group 420 each comprise a different number of LED elements or when the first LED group 410 and the second LED group 420 are different
  • the first LED group 410 and the second LED group 420 may have different forward voltage levels.
  • the first LED group 410 should be designed to have a forward voltage level that can be driven by the second drive voltage supplied by the loopback compensation unit 300 in the compensation period. do.
  • the first LED group 410 may be configured such that the peak value Vrec_peak of the rectified voltage is more than twice the forward voltage level of the first LED group 410. Further, in one exemplary embodiment, the first LED group 410 and the second such that the forward voltage level of the first LED group 410 is less than or equal to the forward voltage level of the second LED group 420. LED group 420 may be configured. When designed in this manner, the first LED group 410 is always turned on during the entire period of the AC voltage (V AC ).
  • the LEDs constituting the first group of LEDs 410 that will always be turned on during the full range of alternating voltage (V AC ) to improve flicker performance as described above. It is preferable that the number of rays is designed to be larger than the number of LEDs constituting the second LED group 420 emitting only in the second operating period. Thus, in this case, the forward voltage level of the first LED group 410 may be designed to be significantly larger than the forward voltage level of the second LED group 420.
  • the rectifier 200 is configured to rectify the AC voltage V AC input from an external power source to generate and output a rectified voltage Vrec.
  • the rectifier 200 one of various known rectifier circuits such as a full-wave rectifier circuit and a half-wave rectifier circuit may be used.
  • the rectifier 200 is configured to provide the generated rectified voltage Vrec to the loopback compensation unit 300, the LED light emitting unit 400, and the LED driving controller 500.
  • 4 shows a bridge full-wave rectification circuit composed of four diodes D1, D2, D3, and D4.
  • the loopback compensator 300 is configured to charge energy using the rectified voltage Vrec in the charging section, and provide a second driving voltage to the LED light emitting unit 400 in the compensation section.
  • the first capacitor C1 is shown as a loopback compensation unit 300 according to the present invention.
  • the present invention is not limited thereto, and one of various known compensation circuits (for example, a valley fill circuit, etc.) may be adopted and used as necessary.
  • one end of the loopback compensator 300 is connected to the anode end of the first LED group 410, and the other end of the loopback compensator 300 connects the third constant current switch SW3. It is connected to the LED drive control unit 500 through.
  • one end of the loopback compensator 300 may be connected to an anode end of another LED group.
  • the loopback compensator 300 is configured to supply a second driving voltage to the second LED group (or the second LED group to the third LED group, etc.) in the compensation period.
  • one end of the loopback compensator 300 is connected to an anode end of the first LED group 410 to be described based on an embodiment configured to supply a second driving voltage to the first LED group 410 in a compensation section. Let's proceed.
  • the loopback compensator 300 includes a second operation section (that is, a section in which the voltage level of the rectified voltage Vrec is greater than or equal to the second forward voltage level Vf2). Is discharged in a non-light emitting period (ie, a period in which the voltage level of the rectified voltage Vrec is less than the first forward voltage level Vf1) to provide a second driving voltage to the first LED group 410.
  • a non-light emitting period ie, a period in which the voltage level of the rectified voltage Vrec is less than the first forward voltage level Vf1
  • the LED lighting apparatus 1000 according to the present invention includes four LED groups from the first LED group 410 to the fourth LED group (not shown).
  • the loopback compensator 300 may be charged in a fourth operation section (ie, a section in which the voltage level of the rectified voltage Vrec is greater than or equal to the fourth forward voltage level Vf4).
  • the loopback compensation unit 300 may be It should be noted that charging may be performed in the nth operation section (ie, the section in which the voltage level of the rectified voltage Vrec is greater than or equal to the nth forward voltage level Vfn).
  • the forward voltage level compensated by the loopback compensator 300 according to the present invention is the energy charge / discharge element (for example, the first capacitor C1 of FIG. 4) constituting the loopback compensator 300. It can be designed variously according to the capacity.
  • the loopback compensation unit 300 according to the present invention may be configured to compensate for a voltage level of 1/2 of the total forward voltage level (voltage level of the sum of the forward voltage levels of the LED groups). Therefore, in an embodiment in which the forward voltage level of the first LED group 410 is less than or equal to the forward voltage level of the second LED group 420, the loopback compensation unit 300 according to the present invention may perform the first forward direction in the compensation period. It can be configured to supply a voltage of the voltage level (Vf1). In this case, as described above, the first LED group 410 is always turned on regardless of the cycle of the AC power.
  • the LED driving control unit 500 according to the related art shown in FIG. 2 is configured to control sequential driving between a plurality of LED groups using a driving voltage detection method
  • the LED driving control unit 500 according to the present invention is Detects and detects the LED driving current I LED flowing through the LED light emitting unit 400 or the LED driving current I LED flowing through the constant current switch (s) SW1 to SW3 connected to the LED light emitting unit 400.
  • the sequential driving of the first LED group 410 and the second LED group 420 may be controlled based on the LED driving current I LED .
  • the present invention can be similarly applied to an LED lighting device configured to control sequential driving between a plurality of LED groups using a driving voltage detection scheme.
  • the LED driving control unit 500 is the first constant current switch (SW1) for the sequential drive control through the drive current detection method as described above
  • the second constant current switch SW2 and the third constant current switch SW3 may be included.
  • 4 illustrates an embodiment in which the first constant current switch SW1 to the third constant current switch SW3 are implemented as separate switches outside the LED driving controller 500, but the first constant current switch SW1 to the third constant current are illustrated. It will be apparent to those skilled in the art that the switch SW3 can be included in the LED drive control 500.
  • each of the first constant current switch SW1 to the third constant current switch SW3 is turned on under the control of the LED driving controller 500 to connect the current path or to turn off the current path. separation, and is configured to perform a function of a constant current control by detecting an LED driving current (I LED) flowing through the current path connected to the LED drive current (I LED) with a preset value. More specifically, as shown in FIG. 4, the first constant current switch SW1 is positioned between the node between the first LED group 410 and the second LED group 420 and the LED driving controller 500. The first current path P1 is connected or disconnected under the control of the LED driving controller 500.
  • the second constant current switch SW2 is positioned between the second LED group 420 and the LED driving controller 500 to connect the second current path P2 under the control of the LED driving controller 500, or It will perform the function of separating.
  • the third constant current switch SW3 is positioned between the loopback compensator 300 and the LED driving controller 500 to connect or disconnect the third current path P3 under the control of the LED driving controller 500. It will perform the function.
  • the first constant current switch SW1 to the third constant current switch SW3 of the present invention as described above may be implemented using various known techniques.
  • each of the first constant current switch SW1 to the third constant current switch SW3 is a sensing resistor for detecting current, a reference current value and a current detected value.
  • the differential amplifier for comparing the current value, and may control the connection of the path according to the output of the differential amplifier, and may also include a switching element configured to control the LED drive current value flowing through the path to a constant current when the path is connected.
  • the switching elements of the first constant current switch SW1 to the third constant current switch SW3 of the present invention may be a metal oxide semiconductor field effect transistor (MOSFET), an insulated gate bipolar transistor (IGBT), or a junction type.
  • the transistor may be implemented using one of a transistor BJT, a junction field effect transistor JFET, a silicon controlled rectifier, and a triac.
  • the LED drive control section 500 of the present invention as shown in Figure 4 has a first constant-current switch (SW1) as the detection of the LED driving current (I LED), and the above in accordance with the detected LED drive current (I LED) To third third current switch SW3 to control sequential driving of the first LED group 410 and the second LED group 420.
  • SW1 first constant-current switch
  • I LED the LED driving current
  • I LED the LED driving current
  • FIGS. 5A to 5D are block diagrams illustrating switch control states and LED driving currents according to operation sections of the LED lighting apparatus according to the first embodiment of the present invention illustrated in FIG. 4.
  • an operation process of the LED lighting apparatus 1000 according to the first embodiment of the present invention will be described in detail with reference to FIGS. 5A to 5D.
  • FIG. 5A shows the relationship between the control state of the first constant current switch SW1 to the third constant current switch SW3 and the LED driving current I LED in the first operation section.
  • the first constant current switch SW1 and the second constant current switch SW2 are turned on, and the third constant current switch SW3 is turned off in the first operation period.
  • the driving voltage supplied to the LED light emitting unit 400 in the non-compensation section, the first driving voltage (rectified voltage Vrec) provided from the rectifying unit 200)
  • the first driving voltage rectified voltage Vrec
  • the LED driving current I LED flows in the 410, and accordingly, the first LED group 410 is turned on.
  • the LED driving current I LED flowing through the first LED group 410 is controlled to be constant current by the first constant current switch SW1 to a value of the first LED driving current I LED1 preset.
  • FIG. 5B shows the relationship between the control state of the first constant current switch SW1 to the third constant current switch SW3 and the LED driving current I LED in the second operation section.
  • the driving voltage supplied to the LED light emitting unit 400 continuously increases to add the forward voltage level of the first LED group 410 and the forward voltage level of the second LED group 420. From the time when the voltage level becomes higher than the second forward voltage level Vf2, the LED driving current I LED also flows in the second LED group 420, so that the second LED group 420 is also turned on.
  • the second constant current switch SW2 connecting the second LED group 420 to the LED driving controller 500 through the second current path P2 is turned on in the first operation period.
  • LED drive control 500 is a second detection of constant-current switch (SW2), the LED driving current (I LED) flowing through, and the second constant-current switch (SW2), the LED driving current (I LED) flowing through the transient state (current Goes up and / or falls) to determine whether it is normally in a constant current state.
  • the LED driving controller 500 determines that the driving voltage supplied to the LED light emitting unit 400 is sufficient to drive the first LED group 410 and the second LED group 420 (that is, the voltage level of the driving voltage is second).
  • the first constant current switch SW1 is turned off, and enters the second operation section.
  • the LED driving controller 500 turns on the third constant current switch SW3 to connect the third current path P3 and flows through the third constant current switch SW3 to the loopback compensator charging current Ic. Start to detect.
  • the relationship between the control state of the first constant current switch SW1 and the second constant current switch SW2 and the LED driving current I LED at the time when the second operation period is entered is shown in FIG. 5B.
  • the second LED driving current I LED2 is lower than the first LED driving current I LED1 .
  • the relationship between the second LED driving current (I LED2 ) and the first LED driving current (I LED1 ) such that an inverse relationship is established with the number of LEDs that emit light for each operation section so that the light output for each operation section is substantially the same. Relationships can be established.
  • FIG. 5C shows the relationship between the control state of the first constant current switch SW1 to the third constant current switch SW3 and the LED driving current I LED in the charging section.
  • the LED driving controller 500 detects the charging current Ic during the second operation period, and the rectified voltage Vrec gradually rises so that the charging current Ic reaches a predetermined value.
  • the LED driving controller 500 enters the charging section by turning off the second constant current switch SW2.
  • a block diagram of this state is shown in Fig. 5C.
  • the third LED driving current I LED3 is connected to the first LED group through the third current path P3. 410 and the loopback compensator 300. Therefore, in this charging section, only the first LED group 410 emits light and the second LED group 420 is turned off.
  • the LED driving controller 500 continuously detects the third LED driving current I LED3 flowing through the third current path P3 during the charging period.
  • the LED driving controller 500 Returns to the second operation section by controlling the first constant current switch SW1 to the third constant current switch SW3 in the state shown in FIG. 5B. That is, the LED driving controller 500 turns off the third constant current switch SW3 and turns on the second constant current switch SW2. Accordingly, as described above, both the first LED group 410 and the second LED group 420 emit light during the second operation period, wherein the LED driving current I LED is the second LED driving current I LED2. Constant current control.
  • the LED driving controller 500 moves from the first constant current switch SW1 to the third constant current switch SW3 in the state shown in FIG. 5B. ) Is returned to the first operation section.
  • the LED driving current I LED is controlled to be constant current by the value of the first LED driving current I LED1 .
  • the LED driving controller 500 may move from the first constant current switch SW1 to the third constant current switch SW3 in the state shown in FIG. 5D.
  • the control state of the constant current switches of FIG. 5A and the control state of the constant current switches of FIG. 5D are the same. Therefore, the control of the constant current switches may not substantially occur, and the second driving voltage is naturally supplied from the loopback compensation unit 300 to the first LED light emitting unit 400 only because of the potential difference.
  • the second driving voltage is provided to the first LED group 410 from the loopback compensator 300, and accordingly, the fourth LED driving current I LED4 flows through the first current path.
  • the lighting state of the first LED group 410 is maintained.
  • the fourth LED driving current I LED4 may be substantially the same as the first LED driving current I LED1 .
  • control for the first operation section, the second operation section, the charging section, the second operation section, the first operation section, and the compensation section is sequentially performed during one period of the rectified voltage Vrec. This control is periodically repeated for every period of the voltage Vrec.
  • FIG. 6 is a waveform diagram illustrating the relationship between the rectified voltage, the LED driving current, the input current, and the light output of the LED light emitting unit according to time of the LED lighting apparatus according to the first embodiment of the present invention shown in FIG. 4.
  • FIG. 6A illustrates the waveform of the rectified voltage Vrec over time
  • FIG. 6B illustrates the waveform of the LED driving current I LED over time
  • FIG. 6C Shows the waveform of the input current (Iin) input from the AC power supply (Vac) to the LED lighting device over time
  • Figure 6 (d) shows the light output waveform of the LED light emitting unit 400 over time. Doing.
  • the LED light emitting unit 400 does not emit light because the loopback compensator 300 is not charged when the LED lighting apparatus 1000 starts to be activated.
  • the first LED group 410 is turned on at a time t1 when the voltage level of the rectified voltage Vrec reaches the first forward voltage level Vf1. The state at this time is shown in FIG. 5A.
  • the LED driving controller 500 switches the second constant current switch SW2 and the third constant current switch SW3. Turn on and enter the second operation section by turning off the first constant current switch SW1.
  • This state is shown in FIG. 5B.
  • Both the first LED group and the second LED group 420 of the second operating period are turned on, and as described above, the second LED driving current I LED2 in the second operating period is the first LED driving current I
  • the constant current control is set to a lower value than LED1 ).
  • the first LED driving current I LED1 and the second LED driving current I LED2 may be set to various values as necessary.
  • the first LED driving current I LED1 and the second LED driving current I LED2 may be set to the same value, and according to an embodiment, the second LED driving current I LED2 drives the first LED. It may be set higher than the current I LED1 . Therefore, as shown in FIG. 6D, the light output of the LED light emitting unit 400 in the second operating period is substantially equal to the light output of the LED light emitting unit 400 in the first operating period. Can be. As described above, the LED driving controller 500 continuously detects whether the charging current Ic flows through the third constant current switch SW3 during the second operation period.
  • the LED driving controller 500 switches the second constant current switch SW2. Enter the charging section by turning off).
  • the LED driving current I LED flowing through the first LED group 410 and the loopback compensator 300 is a constant current at a value of the third LED driving current I LED3 preset by the third constant current switch SW3.
  • the value of the first LED driving current I LED1 and the value of the third LED driving current I LED3 may be set to be the same. This is to reduce the light output deviation according to the operation section.
  • the LED driving controller 500 When the voltage level of the rectified voltage (Vrec) falls past the highest point and reaches a time when the charging current is not stably supplied to the loopback compensator 300 (t4), the LED driving controller 500 is shown in FIG. 5B. As described above, the second constant current switch SW2 is turned on to enter the second operation section.
  • the LED driving control unit 500 opens the first constant current switch SW1 as shown in FIG. 5A.
  • the first operation period is entered by turning on and turning off the third constant current switch SW3.
  • the LED driving controller 500 is configured to determine whether the voltage level of the rectified voltage Vrec becomes less than the second forward voltage level Vf2 by detecting the second LED driving current I LED2 . That is, when the detected second LED driving current I LED2 becomes less than or equal to a preset value, the LED driving controller 500 is configured to determine that the voltage level of the rectified voltage Vrec is less than the second forward voltage level Vf2. Can be.
  • the second driving voltage from the loopback compensator 300 becomes the first LED.
  • the first LED group 410 emits light by being supplied to the group 410.
  • a separate constant current switch control is not performed at this point, and the discharge from the loopback compensator 300 to the first LED group 410 may be naturally performed by the potential difference.
  • the first LED group 410 is again driven by the rectified voltage Vrec as shown in FIG. 5A. It will emit light.
  • the sequential control processes as described above are periodically repeated every one period of the rectified voltage Vrec.
  • the LED light emitting unit 400 maintains a substantially constant light output over all sections of the rectified voltage (Vrec). This is an effect that can be achieved by controlling the second LED driving current I LED2 in the second operating period to a lower value than the first LED driving current I LED1 .
  • the LED light emitting unit 400 has been described with reference to the embodiment consisting of two LED groups of the first LED group 410 and the second LED group 420, LED It will be apparent to those skilled in the art that the same manner can be applied to the embodiment of the light emitting unit 400 consisting of three, four or more LED groups, and it is also within the scope of the present invention. It will be apparent to those skilled in the art.
  • FIG. 7 is a schematic block diagram of an LED lighting apparatus according to a second embodiment of the present invention
  • FIGS. 8A to 8D illustrate operation periods of the LED lighting apparatus according to the second embodiment of the present invention shown in FIG. 7.
  • a fourth between the node between the first LED group 410 and the second LED group 420 and the loopback compensation unit 300 is provided.
  • the configuration of the LED lighting apparatus 1000 according to the first embodiment shown in FIG. 4 is similar except that a switch SW4 is provided. Therefore, the overlapping configuration and functions will be described with reference to FIG. 4, and the LED lighting apparatus 1000 according to the second embodiment of the present invention will be described below with a focus on differences from the first embodiment. do.
  • the fourth switch SW4 as shown in FIG. 7 may be included to more precisely control the charge / discharge process of the loopback compensator 300 under the control of the LED driving controller 500.
  • the fourth switch SW4 maintains a turn-off state, as shown in FIG. 8A. Accordingly, no current flows to the loopback compensator 300 during the first operation period.
  • the fourth switch SW4 is turned on at the time of entering the second operation section, thereby connecting the current path between the rectifier 200 and the loopback compensator 300. Through the current path, the charging current Ic may flow to the loopback compensator 300.
  • the fourth switch SW4 remains turned on to continuously charge the loopback compensator 300 by the charging current Ic. To be able.
  • the fourth switch SW4 maintains the turn-on state. Then, at the time when entering the first operation section from the second operation section, as shown in FIG. 8A, the fourth switch SW4 is turned off.
  • the LED lighting apparatus 1000 when the voltage level of the rectified voltage (Vrec) is less than the first forward voltage level (Vf1), the LED lighting apparatus 1000 according to the second embodiment enters the compensation section.
  • the fourth switch SW4 remains turned off even during the compensation period.
  • 8D and 8E show the control states of the first constant current switch SW1 to the fourth switch SW4 in the LED lighting device 1000 during the compensation section.
  • the loopback compensation unit 300 is configured to compensate for both the second operation period and the first operation period, unlike the first embodiment. More specifically, when the voltage level of the rectified voltage (Vrec) is less than the first forward voltage level (Vf1), the second driving voltage from the loopback compensation unit 300 due to the potential difference, the first LED group 410 and the second To be supplied to the LED group 420. Therefore, at this time, as shown in FIG. 8D, the first constant current switch SW1 is turned off and the second constant current switch SW2 is maintained in the turned on state. At this time, the fourth LED driving current (I LED4 ) flows, and the fourth LED driving current (I LED4 ) is controlled to be constant current by a second constant current switch (SW2). The fourth LED driving current I LED4 may be set to the same value as the second LED driving current I LED2 .
  • the fourth LED driving current I LED4 becomes equal to or less than a preset value.
  • the LED driving controller 500 turns on the first constant current switch SW1. Therefore, only the first LED group 410 emits light in this section, and the fifth LED driving current I LED5 flowing at this time is controlled to be a constant current to a preset value by the first constant current switch SW1.
  • the fifth LED driving current I LED5 may be set to the same value as the first LED driving current I LED1 .
  • the LED lighting apparatus 1000 When the voltage level of the rectified voltage Vrec rises again to reach the first forward voltage level Vf1, the LED lighting apparatus 1000 is in the state of FIG. 8A. As described above, since the control state of the constant current switches in the last compensation section and the control state of the constant current switches in the first driving section are the same, control of separate constant current switches is not necessary.
  • FIG. 9 is a schematic structural block diagram of an LED lighting apparatus according to a third embodiment of the present invention. Referring to FIG. 9, the configuration and function of the LED lighting apparatus 1000 according to the third embodiment of the present invention will be described in detail.
  • the LED lighting apparatus 1000 according to the third embodiment of the present invention illustrated in FIG. 9 is illustrated in FIG. 4 except that the second compensation unit 310 is provided in parallel with the second LED group 420.
  • the configuration of the LED lighting apparatus 1000 according to the first embodiment is similar. Therefore, the overlapping configuration and function will be described with reference to FIG. 4, and the LED lighting apparatus 1000 according to the third embodiment of the present invention will be described below with a focus on differences from the first embodiment. do.
  • the second compensator 310 may be implemented as a second capacitor C2, but is not limited thereto.
  • Various electrical charge / discharge devices and / or electrical charge / discharge circuits may be used. It can be implemented using.
  • the second compensator 310 is charged in the second operation section as described above, and the second LED group 420 in the operation section other than the second operation section (that is, the operation section in which the second LED group 420 is turned off). It is configured to perform the function of supplying a second driving voltage to). Accordingly, in the third exemplary embodiment as shown in FIG. 9, the first LED group 410 and the second LED group 420 may be always turned on over all sections of the rectified voltage Vrec.
  • FIG. 10 is a schematic structural block diagram of an LED lighting apparatus according to a fourth embodiment of the present invention. With reference to FIG. 10, the configuration and function of the LED lighting apparatus 1000 according to the fourth embodiment of the present invention will be described in detail.
  • the LED lighting apparatus 1000 according to the fourth embodiment of the present invention shown in FIG. 10 includes a first LED driving current setting unit 610 and a second for setting the first LED driving current I LED1 to a desired value.
  • the second LED driving current setting unit 620 for setting the LED driving current I LED2 to a desired value, and the third LED driving current setting unit 630 for setting the third LED driving current I LED3 to a desired value. ) May be further included. Except for this, the configuration of the LED lighting apparatus 1000 according to the first embodiment shown in FIG. 4 is similar. Therefore, the overlapping configuration and function will be described with reference to FIG. 4, and the LED lighting apparatus 1000 according to the fourth embodiment of the present invention will be described below with a focus on differences from the first embodiment. do.
  • the first LED driving current I LED1 , the second LED driving current I LED2 , and the third LED driving current I LED3 are shown.
  • the fourth LED driving current (I LED4 ) can not be set respectively. That is, in the case of the LED lighting apparatus 1000 according to the prior art, since it is configured to control the LED driving current (I LED ) for each operation section in the form of a stair wave, generally one LED driving current (for example, the fourth LED driving current (I LED4 )) was set, and the remaining LED driving currents were configured to be controlled as a ratio of the set LED driving current.
  • the third LED driving current (I LED3 ) is 80-95% of the fourth LED driving current (I LED4 ), and the second LED driving current ( ILED2 ) is 65- of the fourth LED driving current (I LED4 ).
  • the first LED driving current (I LED1 ) was set to 30 ⁇ 65% of the fourth LED driving current (I LED4 ).
  • each LED driving current I LED cannot be set separately, which is particularly driven according to the ratio as described above in order to improve flicker performance. Rather than adjusting the current, it became a problem in that it was difficult to set the LED driving current arbitrarily for each operation section.
  • the first LED driving current setting unit 610, the second LED driving current setting unit 620, and the third LED driving current setting unit 630 is provided separately, so that each LED driving current (I LED ) can be set as needed.
  • I LED LED driving current
  • FIG. 10 an embodiment in which the first LED driving current setting unit 610, the second LED driving current setting unit 620, and the third LED driving current setting unit 630 are implemented using variable resistors will be described. Although shown, it will be apparent to those skilled in the art that the drive current setting section may be implemented with other suitable devices (eg, capacitors, etc.) or other suitable circuitry.
  • FIG. 11 is a schematic block diagram of an LED lighting apparatus according to a fifth embodiment of the present invention
  • FIGS. 12A to 12C are sections of operation of the LED lighting apparatus according to the fifth embodiment of the present invention shown in FIG. A block diagram showing the switch control state and the LED drive current.
  • FIG. 13 is a waveform diagram illustrating the relationship between the rectified voltage, the LED driving current, the input current, and the light output of the LED light emitting unit according to time of the LED lighting apparatus according to the fifth embodiment of the present invention shown in FIG. 11.
  • FIGS. 11 to 13 the configuration and function of the LED lighting apparatus 1000 according to the fifth embodiment of the present invention will be described in detail.
  • the LED lighting apparatus 1000 operates in two stages in the same manner as the LED lighting apparatuses 1000 according to the first to fourth embodiments described above. There are similar aspects, but there is a difference in that they are transformed sequentially rather than sequentially.
  • “sequential drive” means “single stage (discharge section)-> stage 1 operating section (non-compensation section) according to the voltage level of rectified voltage (Vrec) based on one cycle of rectified voltage (Vrec).
  • LED lighting device 1000 according to the voltage level of the rectified voltage (Vrec) on the basis of one period of the rectified voltage (Vrec) "2-stage operation period (discharge section)-> 2 stage operation section (non-compensation section)-> 1 stage operation section (charging section)-> 2 stage operation section (non-compensation section)-> 2 stage operation section (discharge section) "
  • This is called a modified sequential driving method. That is, more LED groups emit light at a relatively lower voltage level, and less LED groups emit light at a relatively higher voltage level, and the loopback compensator 300 is charged at the same time.
  • the charging section entry voltage level Vcharge which is a reference for entering and leaving the charging section, is higher than the second forward voltage level Vf2.
  • the loopback compensation unit 300 is selected to be able to perform the second forward voltage level compensation. That is, the capacity of the loopback compensator 300 is configured to supply the second driving voltage to the first LED group 410 and the second LED group 420 during the compensation period.
  • the loopback compensator 300 performs the first LED group 410 as shown in FIG. And a first LED group 410 and a second LED positioned between a node between the second LED group 420 and the first constant current switch SW1 and charged during the first stage operation period and through a discharge path during the non-compensation period. Configured to supply a third LED drive current I LED3 to the group 420.
  • the LED driving control unit 500 is the first constant current switch (SW1) and the first according to the voltage level of the rectified voltage (Vrec)
  • the second constant current switch SW2 is configured to control the sequential driving of the first LED group 410 and the second LED group 420.
  • the control of the first constant current switch SW1 and the second constant current switch SW2 may be performed based on one of the driving voltage detection method and the driving current detection method as described above.
  • a driving control process of the LED lighting apparatus 1000 according to the fifth embodiment of the present invention will be described in detail with reference to FIGS. 12A to 12C and 13.
  • the second constant current switch SW2 is turned on and the first constant current switch SW1 is turned on. It is turned off.
  • the LED driving current does not flow until the voltage level of the rectified voltage Vrec reaches the second forward voltage level Vf2, and the rectified voltage ( From the time t1 at which the voltage level of Vrec reaches the second forward voltage level Vf2, the second LED driving current I LED2 flows through the second current path P2.
  • the LED driving current I LED flowing through the first LED group 410 and the second LED group 420 is set to the second constant current switch SW2 as a value of the preset second LED driving current I LED2 . Constant current control.
  • the LED driving controller 500 performs a second operation.
  • the charging section is entered by turning off the constant current switch SW2 and turning on the first constant current switch SW1.
  • the charging period entry voltage level Vcharge means a threshold voltage level at which the charging current Ic starts to flow in a state in which the first LED group 410 and the loopback compensator 300 are connected to each other in series.
  • the block diagram of this state is shown in Fig. 12B.
  • the first LED driving current I LED1 passes through the first current path P1.
  • the LED driving controller 500 continuously detects the first LED driving current I LED1 flowing through the first current path P1 during the charging period, and controls the constant current with the preset first LED driving current I LED1 value. do.
  • the second LED driving current I LED2 is lower than the first LED driving current I LED1 .
  • the relationship between the second LED driving current (I LED2 ) and the first LED driving current (I LED1 ) such that an inverse relationship is established with the number of LEDs that emit light for each operation section so that the light output for each operation section is substantially the same. Relationships can be established. Therefore, as can be seen in (e) of FIG. 13, the light output of the LED lighting apparatus 1000 can be maintained constant over the entire section.
  • the LED driving controller 500 when the rectified voltage Vrec reaches the maximum voltage level and gradually decreases after reaching the maximum voltage level as time passes (t3), the LED driving controller 500. Is determined to deviate from the charging section (ie, the first operating section) and returns to the second operating section by controlling the first constant current switch SW1 and the second constant current switch SW2 in the state shown in FIG. 12A again. . That is, the LED driving controller 500 turns off the first constant current switch SW1 and turns on the second constant current switch SW2.
  • the LED driving controller 500 is shown in FIG. 12C.
  • the first constant current switch SW1 and the second constant current switch SW2 are controlled to enter the compensation section.
  • the control state of the constant current switches of FIG. 12A and the control state of the constant current switches of FIG. 12C are the same. Therefore, the control of the constant current switches may not substantially occur, and the first driving group 410 and the second LED group 420 are naturally discharged from the loopback compensator 300 through the discharge path only because of the potential difference. ) Will be supplied.
  • the second driving voltage from the loopback compensator 300 is provided to the first LED group 410 and the second LED group 420, and thus, the third LED through the second current path.
  • the driving current I LED3 flows, and the lighting state of the first LED group 410 and the second LED group 420 is maintained.
  • the third LED driving current I LED3 may be substantially the same as the second LED driving current I LED2 .
  • FIG. 14 is a schematic block diagram of an LED lighting apparatus (hereinafter, referred to as an “LED lighting apparatus”) having improved flicker performance according to a sixth exemplary embodiment of the present invention.
  • LED lighting apparatus an LED lighting apparatus having improved flicker performance according to a sixth exemplary embodiment of the present invention.
  • FIG. 14 a brief look at the configuration and function of the LED lighting apparatus 1000 according to the present invention with reference to FIG.
  • the other end of the loopback compensator 300 has a separate constant current switch (for example, the third constant current switch SW3 in FIG. 4).
  • the n-th constant current switch eg, in common with the cathode end of the n-th LED group (eg, the second LED group 420 shown in FIG. 14)
  • the configuration is similar to that of the LED lighting apparatus 1000 according to the first embodiment shown in FIG. 4. Therefore, the overlapping configuration and functions will be described with reference to FIG. 4, and the LED lighting apparatus 1000 according to the sixth embodiment of the present invention will be described below with a focus on differences from the first embodiment. do.
  • the LED lighting apparatus 1000 may include a rectifier 200, a loopback compensator 300, an LED light emitter 400, and an LED driving controller 500.
  • the loopback compensator 300 and the LED driving controller 500 may configure the LED driving circuit.
  • the LED light emitting unit 400 including the first LED group 410 and the second LED group 420 is shown in FIG. 14, but the LED light emitting unit ( It will be apparent to those skilled in the art that the number of LED groups included in 400 may vary. However, hereinafter, for convenience of explanation and understanding, the LED light emitting unit 400 will be described based on the embodiment consisting of two LED groups, but the present invention is not limited thereto.
  • the first LED group 410 should be designed to have a forward voltage level that can be driven by the second drive voltage supplied by the loopback compensation unit 300 in the compensation interval. do.
  • the first LED group 410 may be configured such that the peak value Vrec_peak of the rectified voltage is more than twice the forward voltage level of the first LED group 410. When designed in this manner, the first LED group 410 is always turned on during the entire period of the AC voltage (V AC ).
  • the loopback compensator 300 is configured to charge energy using the rectified voltage Vrec in the charging section, and provide a second driving voltage to the LED light emitting unit 400 in the compensation section.
  • the loopback compensation unit 300 according to the present invention is connected in parallel with the second LED group 420 is charged during the second operation period. More specifically, as shown in FIG. 14, one end of the loopback compensator 300 is a node (ie, the first LED group) between the first LED group 410 and the second LED group 420 through the charging path. And a cathode end of the first LED group 410 through a discharge path.
  • the other end of the loopback compensator 300 is connected to the second constant current switch SW2 in common with the cathode end of the second LED group 420.
  • one end of the loopback compensator 300 may be connected to an anode end of another LED group.
  • the loopback compensator 300 is configured to supply a second driving voltage to the second LED group (or the second LED group to the third LED group, etc.) in the compensation period.
  • one end of the loopback compensator 300 is connected to an anode end of the first LED group 410 to be described based on an embodiment configured to supply a second driving voltage to the first LED group 410 in a compensation section. Let's proceed.
  • the loopback compensator 300 since the loopback compensator 300 has one end connected to the cathode terminal of the first LED group 410 through the charging path, the voltage level of the second operating section (ie, the rectified voltage Vrec is in the second forward direction). It is charged at the voltage level Vf2 or more, and one end thereof is connected to the anode terminal of the first LED group 410 through the discharge path, so that the voltage level of the non-light emitting period (ie, the rectified voltage Vrec is the first). And discharged in a section less than the forward voltage level Vf1 to provide the second driving voltage to the first LED group 410.
  • the loopback compensator 300 is charged during the operation period of the LED group (s) to which the loopback compensator 300 is connected in parallel, and compensates the second driving voltage during the compensation period.
  • Supply to the target LED group (s). Therefore, it is preferable that the forward voltage level of the LED group (s) to which the loopback compensation unit 300 is connected in parallel is configured to be equal to or higher than the forward voltage level of the LED group (s) supplied with the second driving voltage. That is, in the sixth embodiment shown in FIG. 14, the forward voltage level of the first LED group 410 is preferably equal to or smaller than the forward voltage level of the second LED group 420.
  • the LED lighting apparatus 1000 includes four LED groups from the first LED group 410 to the fourth LED group (not shown).
  • the loopback compensator 300 may be connected to the fourth LED group in parallel and charged in a fourth operation section (ie, a section in which the voltage level of the rectified voltage Vrec is greater than or equal to the fourth forward voltage level Vf4).
  • the loopback compensation unit 300 may be Note that the n-th LED group may be connected in parallel to be charged in the n-th operation period (that is, a period in which the voltage level of the rectified voltage Vrec is greater than or equal to the nth forward voltage level Vfn).
  • the forward voltage level compensated by the loopback compensator 300 according to the present invention is the energy charge / discharge element (for example, the first capacitor C1 of FIG. 14) of the loopback compensator 300. It can be designed variously according to the capacity.
  • the loopback compensation unit 300 according to the present invention may be configured to compensate for a voltage level of 1/2 of the total forward voltage level (voltage level of the sum of the forward voltage levels of the LED groups). Therefore, in an embodiment in which the forward voltage level of the first LED group 410 is less than or equal to the forward voltage level of the second LED group 420, the loopback compensation unit 300 according to the present invention may perform the first forward direction in the compensation period. It can be configured to supply a voltage of the voltage level (Vf1). In this case, as described above, the first LED group 410 is always turned on regardless of the cycle of the AC power.
  • each of the first constant current switch SW1 and the second constant current switch SW2 according to the present invention is turned on under the control of the LED driving controller 500 to connect the current path or turn off the current path. separation, and is configured to perform a function of a constant current control by detecting an LED driving current (I LED) flowing through the current path connected to the LED drive current (I LED) with a preset value.
  • I LED LED driving current
  • the LED drive control section 500 of the present invention as shown in Figure 14 is first constant current switch (SW1) as the detection of the LED driving current (I LED), and the above in accordance with the detected LED drive current (I LED) And controlling the sequential driving of the first LED group 410 and the second LED group 420 by controlling the second constant current switch SW2.
  • SW1 first constant current switch
  • I LED the LED driving current
  • I LED the LED driving current
  • FIGS. 15 to 16 Detailed functions of the LED driving controller 500 will be described below in detail with reference to FIGS. 15 to 16.
  • FIGS. 15A to 15C are block diagrams illustrating switch control states and LED driving currents according to operation sections of the LED lighting apparatus according to the sixth embodiment of the present invention illustrated in FIG. 14.
  • an operation process of the LED lighting apparatus 1000 according to the sixth embodiment of the present invention will be described in detail with reference to FIGS. 15A to 15C.
  • FIG. 15A shows the relationship between the control state of the first constant current switch SW1 and the second constant current switch SW2 and the LED driving current I LED in the first operation section.
  • the first constant current switch SW1 and the second constant current switch SW2 are turned on in the first operation period.
  • the driving voltage supplied to the LED light emitting unit 400 is input driving voltage (first driving voltage provided from the rectifying unit 200 in the non-compensation section (rectified voltage Vrec) ), From the time when the voltage level of the second driving voltage provided from the loopback compensation unit 300 becomes the forward voltage level of the first LED group 410, that is, the first forward voltage level Vf1 or more.
  • the LED driving current (I LED ) flows in the first LED group 410 so that the first LED group 410 is turned on.
  • the LED driving current I LED flowing through the first LED group 410 is controlled to be constant current by the first constant current switch SW1 to a value of the first LED driving current I LED1 preset.
  • FIG. 15B shows the relationship between the control state of the first constant current switch SW1 and the second constant current switch SW2 and the LED driving current I LED in the second operation section.
  • the driving voltage supplied to the LED light emitting unit 400 continues to rise to adjust the forward voltage level of the first LED group 410 and the forward voltage level of the second LED group 420.
  • the LED driving current I LED also flows in the second LED group 420 from the time when the voltage level becomes higher, that is, the second forward voltage level Vf2 or more, so that the second LED group 420 is also turned on. .
  • LED drive control 500 is a second detection of constant-current switch (SW2), the LED driving current (I LED) flowing through, and the second constant-current switch (SW2), the LED driving current (I LED) flowing through the transient state (current Goes up and / or falls) to determine whether it is normally in a constant current state.
  • the LED The driving controller 500 turns on the first constant current switch SW1 by determining that the driving voltage supplied to the LED light emitting unit 400 is sufficient to drive the first LED group 410 and the second LED group 420. -Off, and enter the second operation section.
  • the relationship between the control state of the first constant current switch SW1 and the second constant current switch SW2 and the LED driving current I LED at the time when the second operation section has been entered is shown in FIG. 15B.
  • an input current Iin supplied from the rectifier 200 to the LED light emitting unit 400 flows through the first LED group 410 in the second operation period.
  • the input current Iin is divided into the charging current Ic and the second LED driving current ILED2 after passing through the first LED group 410.
  • the charging current Ic is supplied to the loopback compensator 300 to charge the loopback compensator 300, and the second LED driving current ILED2 is supplied to the second LED group 420 to provide a second LED group ( 420 will emit light. That is, the second LED driving current ILED2 supplied to the second LED group 420 becomes a current obtained by subtracting the charging current Ic from the input current Iin.
  • both the first LED group 410 and the second LED group 420 emit light at the same time, and the loopback compensator 300 is charged.
  • the light output of the second LED group 420 is lower than the light output of the first LED group 410 can be expected to improve the light output deviation.
  • the current controlled by the second constant current switch SW2 in the second operating period is 'second LED driving current ILED2 + charging current Ic', that is, the input current Iin is applied to the second constant current switch.
  • Constant current can be controlled to a preset value.
  • the second LED driving current I LED2 is lower than the first LED driving current I LED1 .
  • the relationship between the second LED driving current (I LED2 ) and the first LED driving current (I LED1 ) such that an inverse relationship is established with the number of LEDs that emit light for each operation section so that the light output for each operation section is substantially the same. Relationships can be established.
  • the LED driving controller 500 Returns to the first operation section by controlling the first constant current switch SW1 and the second constant current switch SW2 in the state shown in FIG. 15A. That is, the LED driving controller 500 turns on the first constant current switch SW1. Accordingly, as described above, only the first LED group 410 emits light during the first operation period, where the LED driving current I LED is controlled to be constant current by the value of the second LED driving current I LED1 .
  • the LED driving controller 500 moves to the first constant current switch SW1 and the second constant current switch SW2 in the state shown in FIG. 15C.
  • the control state of the constant current switches of FIG. 15A and the control state of the constant current switches of FIG. 15C are the same. Therefore, the control of the constant current switches may not substantially occur, and the second driving voltage is naturally supplied from the loopback compensation unit 300 to the first LED light emitting unit 400 only because of the potential difference.
  • the second driving voltage is provided to the first LED group 410 from the loopback compensator 300, and thus, the third LED driving current I LED3 flows through the first current path.
  • the lighting state of the first LED group 410 is maintained.
  • the third LED driving current I LED3 may be substantially the same as the first LED driving current I LED1 .
  • control of the first operation section, the second operation section and the charging section, the first operation section, and the compensation section is sequentially performed during one period of the rectified voltage Vrec, and the control of the rectified voltage Vrec is performed. This control is repeated periodically every cycle.
  • FIG. 16 is a waveform diagram illustrating the relationship between the rectified voltage, the LED driving current, the input current, and the light output of the LED light emitting unit according to time of the LED lighting apparatus according to the sixth embodiment of the present invention shown in FIG.
  • FIG. 16A illustrates the waveform of the rectified voltage Vrec over time
  • FIG. 16B illustrates the waveform of the LED driving current I LED over time
  • FIG. 16C. Shows waveforms of the charging current Ic and the discharging current (ie, the third LED driving current I LED3 ) of the loopback compensator 300 over time
  • FIG. 16E shows the light output waveform of the LED light emitting unit 400 over time.
  • the LED light emitting unit 400 does not emit light because the loopback compensator 300 is not charged when the LED lighting apparatus 1000 starts to be activated.
  • the first LED group 410 is turned on at a time t1 when the voltage level of the rectified voltage Vrec reaches the first forward voltage level Vf1. The state at this time is shown in FIG. 15A.
  • the LED driving controller 500 turns off the first constant current switch SW1 to turn off the second operation tool. Enter the liver.
  • This state is shown in Fig. 15B.
  • Both of the first LED group and the second LED group 420 of the second operation section are turned on, and at the same time, as described above, the charging current Ic is supplied to the loopback compensator 300 to supply the loopback compensator 300. Is charged.
  • the second LED driving current I LED2 in the second operation section is set to a lower value than the first LED driving current I LED1 so that the constant current is controlled.
  • the second LED driving current I LED2 in the second operation section (that is, the section between the time point t2 and the time point t3) is the first operation section ( That is, the constant current is controlled by setting a lower current value than the first LED driving current I LED1 at the time interval between the time points t1 and t2.
  • the charging current Ic is provided to the loopback compensator 300 to charge the loopback compensator 300. Therefore, as shown in FIG. 16E, the light output of the LED light emitting unit 400 in the second operating period becomes substantially the same as the light output of the LED light emitting unit 400 in the first operating period. Can be.
  • the LED driving control unit 500 changes the first constant current switch SW1 as shown in FIG. 15A. Enters the first operating section by turning on.
  • the LED driving controller 500 is configured to determine whether the voltage level of the rectified voltage Vrec becomes less than the second forward voltage level Vf2 by detecting the second LED driving current I LED2 . That is, when the detected second LED driving current I LED2 becomes less than or equal to a preset value, the LED driving controller 500 is configured to determine that the voltage level of the rectified voltage Vrec is less than the second forward voltage level Vf2. Can be.
  • the second driving voltage from the loopback compensator 300 becomes the first LED.
  • the first LED group 410 emits light by being supplied to the group 410.
  • a separate constant current switch control is not performed at this point, and the discharge from the loopback compensator 300 to the first LED group 410 may be naturally performed by the potential difference.
  • the first LED group 410 is again caused by the rectified voltage Vrec as shown in FIG. 15A. It will emit light.
  • the sequential control processes as described above are periodically repeated every one period of the rectified voltage Vrec.
  • the LED light emitting unit 400 maintains a substantially constant light output over all the section of the rectified voltage (Vrec).
  • This causes the first LED group 410 and the second LED group 420 to emit light at the same time and charges the loopback compensator 300. Therefore, all of the input current Iin goes to the LED emitter 400. Because it is not delivered.
  • it is also an effect that can be achieved by setting the second LED driving current I LED2 to a lower value than the first LED driving current I LED1 and controlling the constant current.
  • the LED light emitting unit 400 has been described with reference to the embodiment consisting of two LED groups of the first LED group 410 and the second LED group 420, LED It will be apparent to those skilled in the art that the same manner can be applied to the embodiment of the light emitting unit 400 consisting of three, four or more LED groups, and it is also within the scope of the present invention. It will be apparent to those skilled in the art.
  • FIG. 17 is a schematic block diagram of an LED lighting apparatus according to a seventh embodiment of the present invention.
  • the configuration and function of the LED lighting apparatus 1000 according to the seventh embodiment of the present invention will be described in detail.
  • the LED lighting apparatus 1000 according to the seventh exemplary embodiment of the present invention illustrated in FIG. 17 further includes a third LED group 430 and a third constant current switch SW3.
  • the configuration of the LED lighting apparatus 1000 according to the sixth embodiment is similar. Therefore, the overlapping configuration and functions will be described with reference to FIG. 14, and the LED lighting apparatus 1000 according to the seventh embodiment of the present invention will be described below with a focus on differences from the sixth embodiment. do.
  • the LED lighting apparatus 1000 according to the seventh embodiment of the present invention includes a first LED group 410, a second LED group 420, and a third LED group 430. It is composed. That is, the LED lighting apparatus 1000 according to the seventh embodiment of the present invention is an AC LED lighting apparatus of a three-stage driving method.
  • the loopback compensator 300 is charged during the second operation period and the third operation period, and the second driving voltage is applied to the first LED group 410 in the compensation period. It is configured to provide.
  • the loopback compensation unit 300 since the loopback compensation unit 300 is not charged when the LED lighting apparatus 1000 is initially started, the first LED group 410 to the third LED group 430 do not emit light.
  • the LED driving current ILED flows through the first LED group 410 so that the first LED group flows. Lights up. At this time, the first constant current switch SW1 controls the constant current of the LED driving current ILED to the value of the first LED driving current ILED1.
  • the LED driving current ILED flows through the first LED group 410 and the second LED group 420.
  • the first LED group 410 and the second LED group 420 are turned on.
  • the LED driving control unit 500 enters the second operation section by turning off the first constant current switch SW1, and the second constant current switch SW2 sets the LED driving current ILED to the second LED driving current. Constant current control with (ILED2) value.
  • the charging current Ic is provided to the loopback compensator 300 to start charging the loopback compensator 300.
  • the LED driving current ILED flows through the first LED group 410 through the third LED group 430.
  • the first LED group 410 to the third LED group 430 is turned on.
  • the LED driving control unit 500 enters the third operation section by turning off the second constant current switch SW2, and the third constant current switch SW3 sets the LED driving current ILED to the third LED driving current. Constant current control by (ILED3) value.
  • the charging current Ic may be provided to the loopback compensator 300 in the third operation period so that the loopback compensator 300 may continue to be charged.
  • the LED driving controller 500 enters the second operation section again by turning on the second constant current switch SW2.
  • the third LED driving current ILED3 flowing through the third constant current switch SW3 decreases at a time when the rectified voltage Vrec falls past the highest point and falls below the third forward voltage level Vf3, and thus, the LED
  • the driving controller 500 may be configured to enter the second operation section when the third LED driving current ILED3 falls below a preset value.
  • the loopback compensation unit 300 may continue to be charged in the second operation section.
  • the LED driving controller 500 enters the first operation section again by turning on the first constant current switch SW1. At this point, charging of the loopback compensation unit 300 may be terminated.
  • the second driving voltage is naturally supplied from the loopback compensator 300 to the first LED group 410 due to the potential difference.
  • the first LED group 410 emits light.
  • FIG. 18 is a schematic block diagram of an LED lighting apparatus according to an eighth embodiment of the present invention. Referring to FIG. 18, the configuration and function of the LED lighting apparatus 1000 according to the eighth embodiment of the present invention will be described in detail.
  • the LED lighting apparatus 1000 according to the eighth embodiment of the present invention illustrated in FIG. 18 is illustrated in FIG. 14 except that the second compensator 310 is provided in parallel with the second LED group 420.
  • the configuration of the LED lighting apparatus 1000 according to the sixth embodiment is similar. Therefore, the overlapping configuration and functions will be described with reference to FIG. 14, and the LED lighting apparatus 1000 according to the eighth embodiment of the present invention will be described below with a focus on differences from the sixth embodiment. do.
  • the second compensator 310 may be implemented with a second capacitor C2, but is not limited thereto.
  • Various electrical charge / discharge devices and / or electrical charge / discharge circuits may be used. It can be implemented using.
  • the second compensator 310 is charged in the second operation section as described above, and the second LED group 420 in the operation section other than the second operation section (that is, the operation section in which the second LED group 420 is turned off). It is configured to perform the function of supplying a second driving voltage to). Therefore, in the eighth embodiment as shown in FIG. 19, the first LED group 410 and the second LED group 420 may be always turned on over all the sections of the rectified voltage Vrec.
  • FIG. 19 is a schematic block diagram of an LED lighting apparatus according to a ninth embodiment of the present invention. Referring to FIG. 19, the configuration and function of the LED lighting apparatus 1000 according to the ninth embodiment of the present invention will be described in detail.
  • the LED lighting apparatus 1000 according to the ninth embodiment of the present invention shown in FIG. 19 includes a first LED driving current setting unit 610 and a second for setting the first LED driving current I LED1 to a desired value.
  • a second LED driving current setting unit 620 for setting the LED driving current (I LED2 ) to a desired value may be further included. Except for this, the configuration of the LED lighting apparatus 1000 according to the sixth embodiment shown in FIG. 14 is similar. Therefore, the overlapping configuration and functions will be described with reference to FIG. 14, and the LED lighting apparatus 1000 according to the ninth embodiment will be described below with a focus on differences from the sixth embodiment. do.
  • the first LED driving current I LED1 , the second LED driving current I LED2 , and the third LED driving current I LED3 are shown.
  • the fourth LED driving current (I LED4 ) can not be set respectively. That is, in the case of the LED lighting apparatus 1000 according to the prior art, since it is configured to control the LED driving current (I LED ) for each operation section in the form of a stair wave, generally one LED driving current (for example, the fourth LED driving current (I LED4 )) was set, and the remaining LED driving currents were configured to be controlled as a ratio of the set LED driving current.
  • the third LED driving current (I LED3 ) is 80-95% of the fourth LED driving current (I LED4 ), and the second LED driving current ( ILED2 ) is 65- of the fourth LED driving current (I LED4 ).
  • the first LED driving current (I LED1 ) was set to 30 ⁇ 65% of the fourth LED driving current (I LED4 ).
  • each LED driving current I LED cannot be set separately, which is particularly driven according to the ratio as described above in order to improve flicker performance. Rather than adjusting the current, it became a problem in that it was difficult to set the LED driving current arbitrarily for each operation section.
  • the first LED driving current setting unit 610 and the second LED driving current setting unit 620 are separately provided as necessary. It is configured to set each LED driving current (I LED ).
  • I LED LED driving current
  • FIG. 19 an embodiment in which the first LED driving current setting unit 610 and the second LED driving current setting unit 620 are respectively implemented using a variable resistor is illustrated, but other suitable elements (for example, It will be apparent to those skilled in the art that the driving current setting unit may be implemented by a capacitor or the like) or other suitable circuit.
  • FIG. 20 is a schematic block diagram of an LED lighting apparatus according to a tenth embodiment of the present invention. With reference to FIG. 20, the configuration and function of the LED lighting apparatus 1000 according to the tenth embodiment of the present invention will be described in detail.
  • the tenth embodiment shown in FIG. 20 is similar to the seventh embodiment described above with reference to FIG. 17. Specifically, the tenth embodiment of FIG. 20 differs from the seventh embodiment of FIG. 17 only in that a dummy load 710 is included instead of the third LED group 430.
  • the pseudo load 710 is implemented with the first resistor R1.
  • the pseudo load 710 causes a current to flow through the pseudo load 710 in a section in which the voltage level of the rectified voltage Vrec is greater than or equal to the second forward voltage level Vf2, so that the loopback compensation unit (710) is applied as much as the voltage applied to the pseudo load 710. It may be included to increase the amount of charge charged to 300). Therefore, since the charging amount charged in the loopback compensator 300 is increased, the forward voltage level of the first LED group 410, that is, the first forward voltage level Vf1 may be set to be large. In other words, assuming that the other conditions are the same, including the pseudo load 710 increases the number of LEDs included in the first LED group 410 that maintains the emission state in the full range of the rectified voltage Vrec. This can improve flicker performance.
  • FIG. 21 is a schematic block diagram of an LED lighting apparatus according to an eleventh embodiment of the present invention. Referring to FIG. 21, the configuration and function of the LED lighting apparatus 1000 according to the eleventh embodiment of the present invention will be described in detail.
  • the second compensator 720 is connected in series to the second LED group 420, and the second compensator 720 and the second It differs from the seventh embodiment of FIG. 17 in that a discharge path P5 is further formed between the LED groups 420.
  • the second compensator 720 is charged in a section in which the voltage level of the rectified voltage Vrec is greater than or equal to the second forward voltage level, and the voltage level of the rectified voltage Vrec is less than the second forward voltage level. Discharged through the discharge path (P5) in the interval is configured to supply a second driving voltage to the second LED group 420. Therefore, when using the eleventh embodiment illustrated in FIG.
  • the first LED group 410 and the second LED group 420 may be continuously turned on in the full range of the rectified voltage Vrec.
  • the second compensator 720 is connected to the second LED group 420 in series, an effect of increasing the amount of charge of the loopback compensator 300 connected in parallel thereto may be expected.
  • FIG. 22 is a schematic block diagram of an LED lighting apparatus according to a twelfth embodiment of the present invention. Referring to FIG. 22, the configuration and function of the LED lighting apparatus 1000 according to the twelfth embodiment of the present invention will be described in detail.
  • the node between the second LED group 420 and the third LED group 430 is not connected to the LED driving controller 500 through the second constant current switch SW2, but is connected to the rectifying unit. It is different from the seventh embodiment of FIG. 17 in that it is connected to the cathode end of 200. That is, in the twelfth embodiment of FIG. 22, the second constant current switch SW2 is omitted.
  • the forward voltage level of the first LED group 410 that is, the first forward voltage level Vf1 is lowered to facilitate supply of the second driving voltage by the loopback compensator 300,
  • the efficiency of the circuit is increased by using the second LED group 420 and the third LED group 430, and the first LED group 410 and the third LED group 430 are loopback compensation unit 300 in the compensation period. It is an embodiment that can be driven by the second drive voltage supplied from. Note that in this twelfth embodiment, the forward voltage level of the first LED group 410 must be less than the forward voltage level of the second LED group 420.
  • the discharge path P6 is formed in the compensation period, that is, in the period where the voltage level of the rectified voltage Vrec is less than the first forward voltage level, so that the third LED group 430 and the first LED are formed. Group 410 is lit.
  • FIG. 23 is a schematic block diagram of an LED lighting device (hereinafter, referred to as an “LED lighting device”) having improved flicker performance according to a thirteenth embodiment of the present invention.
  • LED lighting device an LED lighting device having improved flicker performance according to a thirteenth embodiment of the present invention.
  • FIG. 23 a configuration and a function of the LED lighting apparatus 1000 according to the thirteenth embodiment of the present invention will be briefly described with reference to FIG. 23.
  • the loopback compensation unit 300 is configured to supply the second driving voltage to the LED light emitting unit 400 over two times. , which is different from the sixth embodiment described with reference to FIG. 14. However, the rest of the configuration is similar to the sixth embodiment, and the description of the same configuration and function will be used for the above description, and the unique configuration and function of the thirteenth embodiment will be mainly described.
  • the LED lighting apparatus 1000 may include a rectifier 200, a loopback compensator 300, an LED light emitter 400, and an LED driving controller 500. Can be.
  • the loopback compensator 300 and the LED driving controller 500 may configure the LED driving circuit.
  • the LED light emitting unit 400 may be composed of a plurality of LED groups, the plurality of LED groups included in the LED light emitting unit 400 is a LED drive Under the control of the controller 500, the light is sequentially emitted and sequentially turned off.
  • FIG. 23 illustrates an LED light emitting unit 400 including a first LED group 410 and a second LED group 420, the number of LED groups included in the LED light emitting unit 400 varies according to necessity. It will be apparent to those skilled in the art that the present invention may be changed. Hereinafter, for the convenience of explanation and understanding, a thirteenth embodiment of the present invention will be described with reference to the LED light emitting unit 400 including the first LED group 410 and the second LED group 420. Do it.
  • the loopback compensator 300 according to the present invention applies a second driving voltage to the LED light emitter 400 over a second time. It is configured to provide. More specifically, the loopback compensator 300 according to the present invention is connected in parallel with the second LED group 420 and charged in a section in which the voltage level of the rectified voltage Vrec is greater than or equal to the second forward voltage level Vf2. The second LED group 420 is provided to the second LED group 420 during a period in which the voltage level of the rectified voltage Vrec is greater than or equal to the first forward voltage level Vf1 and less than the second forward voltage level Vf2 (hereinafter, referred to as a 'first compensation interval').
  • the first LED group 410 and the second LED group are supplied during a period in which the driving voltage is supplied and the voltage level of the rectified voltage Vrec is less than the first forward voltage level Vf1 (hereinafter referred to as a 'second compensation period'). It may be configured to supply a second driving voltage in parallel to 420. Further, more preferably, during the first compensation period and the second compensation period, the first LED group 410 and the second LED group 420 may be configured to be driven independently of each other. That is, during the first compensation period, the first LED group 410 may be driven independently by the rectified voltage Vrec, and the second LED group 420 may be driven independently by the second driving voltage, and the second compensation may be performed.
  • the first LED group 410 is driven independently by the second drive voltage provided by the first discharge circuit and the second LED group 420 is driven by the second drive voltage provided by the second discharge circuit. It can be driven independently.
  • the loopback compensator 300 has one end of the first LED group 410 and the second LED group via the charging path P3. Connected to a node between 420, connected to an anode end of the second LED group 420 through a first discharge path P4, and connected to an anode end of the first LED group 410 through a second discharge path P5. It can be connected to the anode end.
  • the other end of the loopback compensator 300 according to the present invention is connected to the LED driving controller 500 through the second constant current switch SW2, and a separate current path P6 not passing through the second constant current switch SW2. ) May be further connected to the LED driving control unit 500.
  • the first LED group 410 is the first set of LED groups and the second LED group 420 is the second set of LED groups.
  • one end of the loopback compensation unit 300 may be connected to the anode terminals of the other LED group, and different from the embodiment shown in FIG. 23 during the first compensation period and the second compensation period. It may also be configured to provide a second drive voltage to the LED group (s). Such another embodiment will be described later with reference to FIG. 26.
  • the loopback compensation unit 300 is connected to a node between the first LED group 410 and the second LED group 420 through the charging path P3.
  • the loopback compensator 300 is charged during the operation period of the LED group (s) to which the loopback compensator 300 is connected in parallel, and the loopback compensator (for the first compensation period).
  • the 300 supplies a second drive voltage to the LED group (s) (ie, the second set of LED groups) connected in parallel, and supplies a second drive voltage to the second set of LED groups and the first set during the second compensation interval. Can be supplied to a group of LEDs. Therefore, the LED group (s) in which the forward voltage level of the LED group (s) (ie, the second set of LED groups) to which the loopback compensator 300 is connected in parallel is supplied with the second driving voltage only during the second compensation period. (For the first set of LED groups), preferably at or above the forward voltage level. That is, in the thirteenth embodiment shown in FIG. 23, the forward voltage level of the first LED group 410 is preferably equal to or smaller than the forward voltage level of the second LED group 420.
  • the LED lighting apparatus 1000 includes four LED groups from the first LED group 410 to the fourth LED group (not shown).
  • the loopback compensator 300 may be connected to the fourth LED group in parallel and charged in a fourth operation section (that is, a section in which the voltage level of the rectified voltage Vrec is greater than or equal to the fourth forward voltage level Vf4).
  • the loopback compensator 300 is connected to a node between the third LED group (not shown) and the fourth LED group through the charging path P3).
  • the loopback compensation unit 300 may be Note that the n-th LED group may be connected in parallel to be charged in the n-th operation period (that is, a period in which the voltage level of the rectified voltage Vrec is greater than or equal to the nth forward voltage level Vfn).
  • the charging section, the first compensation section, and the second compensation section of the loopback compensation unit 300 according to the present invention may be variously designed as necessary.
  • the forward voltage level compensated by the loopback compensator 300 is the energy charge / discharge element (for example, the first capacitor C1 of FIG. 23) constituting the loopback compensator 300. It can be designed variously according to the capacity.
  • the LED driving control unit 500 controls the constant current switches SW1 and SW2 connected to the LED light emitting unit 400 according to the voltage level of the rectified voltage Vrec. And control the driving of the LED group 410 and the second LED group 420.
  • the LED driving controller 500 can determine the voltage level of the rectified voltage Vrec in two ways.
  • the LED driving control unit 500 according to the present invention directly detects the voltage level of the rectified voltage (Vrec), based on the first LED group 410 and the second LED group 420 It may also be configured to control the drive.
  • the LED driving control unit 500 according to the present invention is the LED driving current (I LED ) flowing through the LED light emitting unit 400 or the constant current switch (s) (SW1 and connected to the LED light emitting unit 400) Detect the LED driving current I LED flowing through SW2 and control the driving of the first LED group 410 and the second LED group 420 based on the detected LED driving current I LED . It may be.
  • the LED lighting apparatus 1000 according to the present invention will be described based on the embodiment configured to directly detect the driving voltage for convenience of description and understanding, but the present invention uses a plurality of driving current detection methods. It should be noted that the same may be applied to LED lighting devices configured to control the driving between the LED groups.
  • each of the first constant current switch SW1 and the second constant current switch SW2 according to the present invention is turned on under the control of the LED driving controller 500 to connect the current path or turn off the current path. separation, and is configured to perform a function of a constant current control by detecting an LED driving current (I LED) flowing through the current path connected to the LED drive current (I LED) with a preset value.
  • I LED LED driving current
  • the LED driving controller 500 of the present invention detects the voltage level of the rectified voltage Vrec, and determines the first constant current switch SW1 and the first voltage according to the detected voltage level of the rectified voltage Vrec.
  • the second constant current switch SW2 is controlled to control driving of the first LED group 410 and the second LED group 420. Detailed functions of the LED driving controller 500 will be described below in detail with reference to FIGS. 24 to 25.
  • FIG. 24A to 24D are block diagrams illustrating a switch control state for each operation section, a driving current for each LED group, and a charge / discharge current of the loopback compensation unit according to the thirteenth embodiment of the present invention shown in FIG. to be.
  • FIG. 25 illustrates a rectified voltage, a first LED group driving current, a second group LED driving current, and a loopback compensation unit charge / discharge current according to time of the LED lighting apparatus according to the thirteenth embodiment of the present invention shown in FIG. 23. Is a waveform diagram illustrating
  • the loopback compensator 300 is not charged when the LED lighting apparatus 1000 is initially started. Therefore, the LED driving current does not flow through the first LED group 410 or the second LED group 420 until the voltage level of the rectified voltage Vrec reaches the first forward voltage level Vf1. In this state, the first constant current switch SW1 is turned on, and the second constant current switch SW2 is turned off. As time passes, the voltage level of the rectified voltage Vrec supplied to the LED light emitting unit 400 becomes the forward voltage level of the first LED group 410, that is, the first forward voltage level Vf1 or more ( From the time point t1 of FIG.
  • the first current I1 starts to flow in the first LED group 410, and the first LED group 410 is turned on to enter the first operation section.
  • the control state of the first constant current switch SW1 and the second constant current switch SW2 and the LED group driving current I LED_G are It is shown in Figure 24a.
  • the first current I1 flows through the first LED group 410 during the first operating period, so that the first current I1 is driven by the first LED driving current I LED1 .
  • the first LED group driving current I LEDG_1 is controlled to be constant current by the first constant current switch SW1 at a predetermined first LED driving current value. .
  • the LED driving control unit 500 switches the first constant current switch at a point in time when the voltage level of the rectified voltage Vrec increases and becomes equal to or greater than the second forward voltage level Vf2 (time point t2 in FIG. 25).
  • the first current path P1 is disconnected by turning off SW1, the second constant current switch SW2 is turned on, and the second current path P2 is connected to enter the second operation period.
  • the control state of the first constant current switch SW1 and the second constant current switch SW2 and the LED group driving current I LED_G during this second operation period are shown in FIG. 24B.
  • FIGS. 24B and 25 As shown in FIGS. 24B and 25, during this second operation period (time t2 to time t3, time t7 to time t8 of FIG. 25), the second current I2 is performed.
  • the first LED group driving current I LEDG_1 flowing through the first LED group 410 is 'second current I2 +'.
  • the second LED group driving current I LEDG_2 which is the third current I3 'and flows through the second LED group is the second current I2 and is controlled by the second constant current switch SW2.
  • the driving current I LED2 is 'second current I2 + third current I3'. Therefore, during this second operation period, the second LED current (I LED2 ) (that is, the second current I2 + third current I3) is the second constant current switch (2) to the preset second LED drive current value ( Constant current control by SW2).
  • Constant current control by SW2 Constant current control by SW2
  • the first LED group 410 and the second LED group 420 continue to be turned on ( That is, since the number of LEDs that emit light is the same), the preset first LED driving current value and the preset second LED driving current value for the constant current control of the LED driving current can be freely set.
  • the first and second preset LED driving current values for the constant current control of the LED driving current are set to substantially the same current values.
  • the LED drive current value for constant current control of the LED drive current is inversely or substantially inversely proportional to the number of LEDs being lit. It may be configured to. Such another embodiment will be described later with reference to FIG. 26.
  • the first LED group driving current I LEDG_1 during the first compensation period is the first current I1, and the first current I1 is set in advance by the first constant current switch SW1.
  • the constant current is controlled by the value.
  • the loopback compensator 300-> first discharge path P4-> The first discharge circuit leading to the second LED group 420-> loopback compensator 300 is configured, so that the fourth current I4 flows through the second LED group 420 through the first discharge circuit.
  • the second LED group 420 maintains the lighting state.
  • the fourth current I4 flowing through the second LED group 420 during the first compensation period is transmitted through the second LED group during the second operation period. It may be configured to be the same value as the flowing second current (I2).
  • the LED driving controller 500 performs a second compensation period. Can enter During the second compensation period (the period in which the voltage level of the rectified voltage Vrec is less than the first forward voltage level Vf1, the time points t4 to t6 and the time points t8 to t10 of FIG. 25).
  • the control state of the first constant current switch SW1 and the second constant current switch SW2 and the LED group driving current I LED_G are shown in FIG. 24D. As shown in FIG.
  • the control states of the first constant current switch SW1 and the second constant current switch SW2 during the second compensation period are the first constant current switch SW1 and the second during the first compensation period. It is the same as the control state of the constant current switch SW2, and the first discharge circuit and the second discharge circuit are naturally formed by the potential difference between the voltage level of the loopback compensator 300 and the voltage level of the rectified voltage Vrec. . That is, as shown in FIG. 24D, during the second compensation period, the first LED group 410 and the second LED group 420 are connected to the loopback compensator 300 in parallel to each other to generate the second driving voltage. Will be supplied.
  • the second LED group 420 is connected to the loopback compensator through the first discharge circuit as described above, and is driven by the fourth current I4.
  • the first LED group 410 the loopback compensation unit 300-> second discharge path (P5)-> first LED group 410-> first constant current switch (SW1)-> LED driving control unit ( 500)-> is connected to the loopback compensation unit 300 through a second discharge circuit leading to the loopback compensation unit 300.
  • the fifth current I5 flows through the first LED group 410 through the second discharge circuit so that the first LED group 410 is maintained in a lit state.
  • the first LED group driving current I LEDG_1 flowing through the first LED group 410 during the second compensation interval is the fifth current I5, and in order to reduce or eliminate the light output deviation for each operation section.
  • the first constant current switch SW1 has the same value as the first current I1 flowing through the first LED group during the first compensation period through the fifth current I5 flowing through the first LED group 410 during the second compensation period. Can be controlled by the constant current. This result is shown in FIG. 25.
  • the first LED group 410 and the second LED group 420 are independent of each other using separate current paths. Will be driven.
  • the control state of the first constant current switch SW1 and the second constant current switch SW2 during one cycle of the rectified voltage Vrec at the initial startup of the LED lighting apparatus 1000 and the LED group driving current I LED_G are described above. ).
  • the LED lighting apparatus 1000 is changed according to the increase and decrease of the rectified voltage Vrec for one period of the rectified voltage Vrec.
  • Control of the second operation section (charging section) of FIG. 24B-> first compensation section of FIG. 24C-> second compensation section of FIG. 24D is performed sequentially, and such control is performed every cycle of the rectified voltage Vrec. Repeated periodically.
  • the LED lighting apparatus 1000 includes the first LED group 410 and the first LED group over the entire period of the rectified voltage Vrec after the initial startup of the LED lighting apparatus 1000.
  • the two LED group 420 may maintain a lighting state.
  • FIG. 26 is a schematic block diagram of an LED lighting apparatus according to a fourteenth embodiment of the present invention.
  • the LED lighting apparatus 1000 according to the fourteenth embodiment of the present invention illustrated in FIG. 26 further includes a third LED group 430, a third constant current switch SW3, and a third current path P7.
  • the LED lighting apparatus 1000 according to the fourteenth embodiment of the present invention will be described based on differences from the thirteenth embodiment. do.
  • the loopback compensation unit 300 according to the present invention is charged during the second operation period and the third operation period, and the LED driving controller 500 rectifies the voltage during this charging period. It differs from the thirteenth embodiment in that it is configured to control the sequential driving of the second LED group 420 and the third LED group 430 according to the voltage level of Vrec.
  • the loopback compensator 300 according to the present invention is configured to generate the first voltage during the period (first compensation section) in which the voltage level of the rectified voltage Vrec is greater than or equal to the first forward voltage level Vf1 and less than the second forward voltage level Vf2.
  • the second driving voltage is supplied to the second LED group 420 and the third LED group 430, and the second driving voltage is supplied during the period (second compensation period) when the voltage level of the rectified voltage Vrec is less than the first forward voltage level Vf1.
  • Each of a set of LED groups (first LED group 410 in FIG. 26) and a second set of LED groups (second LED group 420 and third LED group 430 connected in series with each other in FIG. 26) It may be configured to supply a second driving voltage.
  • the first constant current switch SW1 is turned on and the second constant current switch SW2 and the third constant current switch SW3 are turned off when the LED lighting apparatus 1000 is initially started. It is a state. In this state, when the voltage level of the rectified voltage Vrec rises and reaches the first forward voltage level Vf1, the first LED driving current I LED1 starts to flow and the first LED group 410 emits light. .
  • the LED driving controller 500 turns off the first constant current switch SW1, The second constant current switch SW2 and the third constant current switch SW3 are turned on to enter the second operation section.
  • the first LED group 410 and the second LED group 420 are turned on, and the charging current is supplied to the loopback compensator 300 through the charging path P3.
  • 'charge current + second LED drive current ()' flows through the first LED group 410, and the second LED drive current () Flows through the second LED group 420, and the charging current flows through the loopback compensation unit 300.
  • the second constant current switch SW2 is configured to control the constant current only the second LED driving current I LED2 to a preset value during the second operation period of the fourteenth embodiment.
  • the LED driving controller 500 turns off the second constant current switch SW2 to turn off the second voltage. 3 Enter the operation section.
  • the first LED group 410 to the third LED group 430 are turned on, and at the same time, the charging current is supplied to the loopback compensator 300 through the charging path P3.
  • the third constant current switch SW3 performs constant current control of the 'charge current + third LED driving current I LED3 ' to a preset value.
  • the LED driving controller 500 when the voltage level of the rectified voltage Vrec reaches the highest point as time passes and starts to fall, and reaches the second forward voltage level Vf2 again, the LED driving controller 500 generates the second constant current.
  • the switch SW2 is turned on to enter the second operation section again.
  • the LED driving controller 500 switches the second constant current switch SW2 and the third.
  • the first compensation section is entered by turning off the constant current switch SW3 and turning on the first constant current switch SW1.
  • the first LED group 410 is driven by the rectified voltage Vrec and the second LED group 420.
  • the third LED group 430 are driven by the second driving voltage supplied from the loopback compensator 300 through the first discharge path P4.
  • the first discharge circuit is configured to lead to the 2 LED group 420-> the third LED group 430-> the loopback compensation unit 300, and accordingly the first discharge current (for example, The fourth current I4 of FIG. 24C flows through the second LED group 420 and the third LED group 430 so that the second LED group 420 and the third LED group 430 remain lit. Done.
  • the LED driving controller 500 may enter the second compensation section.
  • the control state of the first constant current switch SW1 to the third constant current switch SW3 during the second compensation period is the control state of the first constant current switch SW1 to the third constant current switch SW3 during the first compensation period.
  • the first discharge circuit and the second discharge circuit are naturally formed by the potential difference between the voltage level of the loopback compensator 300 and the voltage level of the rectified voltage Vrec. That is, during this second compensation interval, the first set of LED groups (first LED group 410) and the second set of LED groups (second LED group 420 and third LED group 430 connected in series with each other).
  • the second LED group 420 and the third LED group 430 are connected to the loopback compensator through the first discharge circuit as described above, and are driven by the first discharge current.
  • the first LED group 410, the loopback compensation unit 300-> second discharge path (P5)-> first LED group 410-> first constant current switch (SW1)-> LED driving control unit ( 500)-> is connected to the loopback compensation unit 300 through a second discharge circuit leading to the loopback compensation unit 300.
  • a second discharge current (for example, the fifth current I5 of FIG. 24D) flows through the first LED group 410 through the second discharge circuit, thereby allowing the first LED group 410 to flow. ) Will stay on.
  • the LED lighting apparatus 1000 changes the " second compensation section-> first compensation section-> second operation section (charge section) according to the increase or decrease of the rectified voltage Vrec for one period of the rectified voltage Vrec. )-> The third operating section (charging section)-> the second operating section (charging section)-> the first compensation section-> the second compensation section "is carried out sequentially, and each of the rectified voltage (Vrec) This control is repeated periodically every cycle.
  • the LED lighting apparatus 1000 according to the thirteenth embodiment includes the first LED group 410 and the first LED group over the entire period of the rectified voltage Vrec after the initial startup of the LED lighting apparatus 1000.
  • the 2 LED group 420 maintains the lighting state, and the third LED group 430 may be selectively turned on / off according to the voltage level of the rectified voltage Vrec.
  • the third LED group 430 is selectively turned on / off according to an operation section, the number of LEDs that emit light for each operation section. Makes a difference. Therefore, in order to remove or minimize the light output deviation according to the operation section, it is possible to control the magnitude of the LED driving current flowing through the LED group (s) for each operation section differently. For example, the magnitude of the LED driving current during the operation period (the first compensation period, the second compensation period, and the third operation period) in which all of the first LED group 410 to the third LED group 430 is turned on is determined.
  • Only the first LED group 410 and the second LED group 420 may be controlled to have a current value smaller than the magnitude of the LED driving current during the operation period (second operation period) that is lit. At this time, the magnitude of the LED driving current may be determined to be inversely or approximately inversely proportional to the number of LEDs emitted.
  • the third LED group 430 is selectively turned on / off, the number of LEDs constituting the third LED group 430 is determined by the first LED group 410 and / or the second LED group 420. It may be desirable to configure smaller than the number of LEDs.
  • the forward voltage level of the third LED group 430 is set to the forward voltage level of the first LED group 410 and / or the second LED group 420. It may also be desirable to configure smaller than the forward voltage level.
  • the operation process of the LED lighting apparatus 1000 according to the fourteenth embodiment of the present invention including the first LED group 410 to the third LED group 430 has been described above.
  • the same principle can be equally applied to the LED lighting apparatus according to another embodiment including the first LED group 410 to the nth LED group (not shown).
  • one end of the loopback compensation unit 300 is connected to the LED driving control unit 500 through an nth constant current switch (not shown), and the other end of the loopback compensation unit 300 is connected.
  • the charging section of the loopback compensator 300 is the second operation period to the nth operation period, and the second LED group 420 to the nth LED group are sequentially driven during the charging period.
  • the first set of LED groups connected to the loopback compensator 300 in parallel in the compensation interval is a first LED group, and the second set of LED groups are the second to nth LED groups connected in series with each other. to be.
  • the loopback compensator 300 may be configured to include the second LED group to the second LED group during the first compensation period (a period in which the voltage level of the rectified voltage Vrec is greater than or equal to the first forward voltage level Vf1 and less than the second forward voltage level Vf2).
  • the loopback compensation unit 300 supplies the second driving voltage to the nth LED group, and the loopback compensator 300 of the first set is provided during the second compensation period (a period in which the voltage level of the rectified voltage Vrec is less than the first forward voltage level Vf1).
  • a second driving voltage can be supplied to each of the LED group and the second set of LED groups.
  • the first LED group 410 to the fourth LED group (not shown), one end of the loopback compensation unit 300 is connected to the LED driving control unit 500 through a fourth constant current switch (not shown)
  • the other end of the loopback compensator 300 is connected to a node between the second LED group 420 and the third LED group 430 through the charging path P3, and the third LED group through the first discharge path.
  • the first set of LED groups is a first LED group 410 and a second LED group 420 connected in series with each other
  • the second set of LED groups is a third LED connected in series with each other.
  • Group 430 and the fourth LED group is another embodiment connected to the anode end of 430 and connected to the anode end of the first LED group 410 through a second discharge path.
  • the charging section is the third operation section and the fourth operation section
  • the first compensation section is the voltage level of the rectified voltage (Vrec) is more than the first forward voltage level (Vf1) and the third forward voltage
  • the second compensation section is a section below the level Vf3
  • the second compensation section is a section where the voltage level of the rectified voltage Vrec is less than the first forward voltage level Vf1. Therefore, during the charging period, the third LED group 430 and the fourth LED group are sequentially driven according to the voltage level of the rectified voltage Vrec, and the first LED group 410 and the second LED group (for the first compensation period). 420 is sequentially driven according to the voltage level of the rectified voltage Vrec.
  • the loopback compensation unit 300 supplies a second driving voltage to the third LED group 430 and the fourth LED group (that is, the second set of LED groups) during the first compensation period, and during the second compensation period.
  • the loopback compensator 300 includes a first set of LED groups (first LED group 410 and a second LED group 420 connected in series with each other) and a second set of LED groups (third LED group connected in series with each other).
  • a second driving voltage can be supplied to each of 430 and the fourth LED group.
  • loopback compensation unit 300 may be applied to LED groups having various configurations, and is not limited to the specific embodiments described herein.
  • FIG. 27 is a schematic block diagram of an LED lighting apparatus according to a fifteenth embodiment of the present invention. Referring to FIG. 27, the configuration and function of the LED lighting apparatus 1000 according to the fifteenth embodiment of the present invention will be described in detail.
  • the LED lighting apparatus 1000 according to the fifteenth embodiment of the present invention illustrated in FIG. 27 includes a first LED driving current setting unit 610 for setting the first LED driving current I LED1 to a desired value, and A second LED driving current setting unit 620 for setting the 2 LED driving current (I LED2 ) to a desired value may be further included. Except for this, the configuration of the LED lighting apparatus 1000 according to the thirteenth embodiment shown in FIG. 23 is similar. Therefore, the overlapping configuration and functions of the LED lighting apparatus 1000 according to the fifteenth embodiment will be described with reference to FIGS. 23 to 25.
  • the first LED driving current I LED1 , the second LED driving current I LED2 , and the third LED driving current I LED3 are shown.
  • the fourth LED driving current (I LED4 ) can not be set respectively. That is, since the LED lighting device 100 according to the prior art is configured to control the LED driving current (I LED ) for each operation section in the form of a stair wave, generally one LED driving current (for example, the fourth LED driving current (I LED4 )) was set, and the remaining LED driving currents were configured to be controlled as a ratio of the set LED driving current.
  • the third LED driving current (I LED3 ) is 80-95% of the fourth LED driving current (I LED4 ), and the second LED driving current ( ILED2 ) is 65- of the fourth LED driving current (I LED4 ).
  • the first LED driving current (I LED1 ) was set to 30 ⁇ 65% of the fourth LED driving current (I LED4 ).
  • the LED lighting apparatus 100 according to the related art has a problem in that each LED driving current I LED cannot be set separately, which is particularly driven in accordance with the ratio as described above in order to improve flicker performance. Rather than adjusting the current, it became a problem in that it was difficult to set the LED driving current arbitrarily for each operation section.
  • the first LED driving current setting unit 610 and the second LED driving current setting unit 620 are separately provided as necessary, It is configured to set each LED driving current (I LED ).
  • I LED LED driving current
  • FIG. 27 an embodiment in which the first LED driving current setting unit 610 and the second LED driving current setting unit 620 are each implemented using a variable resistor is illustrated, but other suitable elements (for example, It will be apparent to those skilled in the art that the driving current setting unit may be implemented by other suitable circuits.
  • FIG. 28 is a schematic block diagram of an LED lighting apparatus according to a sixteenth embodiment of the present invention. Referring to FIG. 28, the configuration and function of the LED lighting apparatus 1000 according to the sixteenth embodiment of the present invention will be described in detail.
  • the LED lighting apparatus 1000 according to the sixteenth embodiment of the present invention illustrated in FIG. 28 includes a dummy load 630 instead of the third LED group 430. Similar to the LED lighting apparatus 1000 according to the fourteenth embodiment described above.
  • the pseudo load 630 is implemented with the first resistor R1.
  • the pseudo load 630 causes a current to flow through the pseudo load 630 in a section in which the voltage level of the rectified voltage Vrec is greater than or equal to the second forward voltage level Vf2, so that the loopback compensation unit ( It may be included to increase the amount of charge charged to 300). Therefore, since the charging amount charged in the loopback compensator 300 is increased, the forward voltage level of the first LED group 410, that is, the first forward voltage level Vf1 may be set to be large. In other words, assuming that other conditions are the same, including the pseudo load 630 increases the number of LEDs included in the first LED group 410 that maintains the emission state in the full range of the rectified voltage Vrec. This can improve flicker performance.

Abstract

La présente invention se rapporte à un dispositif d'éclairage à diodes électroluminescentes (DEL) du type à attaque séquentielle en courant alternatif, le dispositif d'éclairage à DEL présentant des performances de papillotement améliorées et étant apte à réduire l'écart d'intensité lumineuse du dispositif d'éclairage à DEL généré pendant des intervalles de fonctionnement par suppression d'intervalles non lumineux du dispositif d'éclairage à DEL au moyen d'une unité de compensation à boucle de retour.
PCT/KR2015/012958 2014-12-12 2015-12-01 Circuit d'attaque de del à performances de papillotement améliorées, et dispositif d'éclairage à del le comprenant WO2016093534A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US15/322,005 US10187945B2 (en) 2014-12-12 2015-12-01 LED drive circuit with improved flicker performance, and LED lighting device comprising same
DE212015000282.9U DE212015000282U1 (de) 2014-12-12 2015-12-01 LED-Schaltkreis mit verbesserter Flimmerleistung und Beleuchtungseinrichtung umfassend dieselbe
EP15868227.8A EP3232739A4 (fr) 2014-12-12 2015-12-01 Circuit d'attaque de del à performances de papillotement améliorées, et dispositif d'éclairage à del le comprenant
US15/475,003 US10321529B2 (en) 2014-12-12 2017-03-30 LED drive circuit with improved flicker performance, and LED lighting device comprising same

Applications Claiming Priority (8)

Application Number Priority Date Filing Date Title
KR10-2014-0179485 2014-12-12
KR1020140179485A KR102309840B1 (ko) 2014-12-12 2014-12-12 플리커 성능이 개선된 led 구동회로 및 이를 포함하는 led 조명장치
KR10-2014-0183283 2014-12-18
KR20140183283 2014-12-18
KR10-2015-0121219 2015-08-27
KR1020150121219A KR102449566B1 (ko) 2014-12-18 2015-08-27 플리커 성능이 개선된 led 구동회로 및 이를 포함하는 led 조명장치
KR1020150161890A KR102427793B1 (ko) 2015-11-18 2015-11-18 플리커 성능이 개선된 led 구동회로 및 이를 포함하는 led 조명장치
KR10-2015-0161890 2015-11-18

Related Child Applications (2)

Application Number Title Priority Date Filing Date
US15/322,005 A-371-Of-International US10187945B2 (en) 2014-12-12 2015-12-01 LED drive circuit with improved flicker performance, and LED lighting device comprising same
US15/475,003 Continuation US10321529B2 (en) 2014-12-12 2017-03-30 LED drive circuit with improved flicker performance, and LED lighting device comprising same

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WO2016093534A1 true WO2016093534A1 (fr) 2016-06-16

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WO (1) WO2016093534A1 (fr)

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CN109951920A (zh) 2019-06-28
CN109951920B (zh) 2021-08-10

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