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WO2014030895A1 - Circuit de commande de del à fonction de retard de source de courant - Google Patents

Circuit de commande de del à fonction de retard de source de courant Download PDF

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Publication number
WO2014030895A1
WO2014030895A1 PCT/KR2013/007435 KR2013007435W WO2014030895A1 WO 2014030895 A1 WO2014030895 A1 WO 2014030895A1 KR 2013007435 W KR2013007435 W KR 2013007435W WO 2014030895 A1 WO2014030895 A1 WO 2014030895A1
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WO
WIPO (PCT)
Prior art keywords
led
unit
power supply
current
time delay
Prior art date
Application number
PCT/KR2013/007435
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English (en)
Korean (ko)
Inventor
신소봉
권옥환
Original Assignee
메를로랩 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.)
Filing date
Publication date
Application filed by 메를로랩 주식회사 filed Critical 메를로랩 주식회사
Publication of WO2014030895A1 publication Critical patent/WO2014030895A1/fr

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/40—Details of LED load circuits
    • H05B45/44—Details of LED load circuits with an active control inside an LED matrix
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/10—Controlling the intensity of the light
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/37—Converter circuits
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/395—Linear regulators
    • H05B45/397—Current mirror circuits
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/40—Details of LED load circuits
    • H05B45/44—Details of LED load circuits with an active control inside an LED matrix
    • H05B45/48—Details of LED load circuits with an active control inside an LED matrix having LEDs organised in strings and incorporating parallel shunting devices
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

Definitions

  • the present invention relates to an LED driving circuit having a time delay function of a current source. Particularly, even when a voltage waveform rapidly increasing is applied to a power supply unit by a dimmer or the like, the current source has a time difference or gradually increases to peaking voltage.
  • the present invention relates to an LED driving circuit having a time delay function of a current source that can fundamentally exclude a factor that prevents malfunction or other normal operation of the LED by current.
  • the LED Light Emitting Diode
  • the LED is a current driving device, and can operate normally when a constant current is stably supplied.
  • LEDs that require high power generate a lot of heat in the LEDs themselves because of the large driving current (typically 350 mA or more), and thus the degradation rate of luminance is greater than that of LEDs at low power. This is directly linked to the lifetime of the LED and is very important in the lighting market.
  • PWM pulse width modulation
  • AC direct type LED lighting device For the above reason, a method of rectifying AC power and applying the same to an LED module connected in series is used, and an LED lighting device using such a method is commonly referred to as an AC direct type LED lighting device. Therefore, for the LED lighting method and the LED lighting device using the same, the term "AC direct type LED lighting device" will be used in the following description.
  • FIG. 1 is a view showing an example of a conventional AC direct type LED lighting apparatus, as shown, the VAC voltage is passed through the dimmer is output as a phase cut voltage VDIM. The voltage VDIM then passes through a rectifier and its differential voltage is converted to a single ended VRECT.
  • the operation is divided into LED1 and CH1, LED1 + LED2 and CH2, LED1 + LED2 + LED3 and CH3.
  • the number of LEDs and the corresponding channel current source are driven according to the magnitude of the input AC voltage.
  • the peaking occurs regardless of the waveform of the current by the initial peak voltage generated from the power source.
  • Figure 2 illustrates a peaking phenomenon of the power supply voltage and the current peaking state according to the conventional AC direct type LED lighting device.
  • a large peaking voltage / current may cause a ringing between parasitic inductance and capacitance existing between the dimmer and the driver immediately after the dimmer is turned on.
  • this may cause a phenomenon in which the current flow of the dimmer is momentarily interrupted and a phenomenon in which the luminaire flickers. In other words, it causes a malfunction of the lighting fixture.
  • the light of the LED generated by the peaking voltage / current corresponds to the unintended light emission in the lighting design, which may cause the light amount of the LED to operate differently than expected. In other words, it is the cause of an incorrect amount of light of the lighting device.
  • the peaking voltage / current basically corresponds to an unintended very high magnitude of voltage / current, which can act as an electromagnetic impact on the surrounding components at any time, which can have a significant impact on reducing the lifetime of the components.
  • the peaking voltage / current may appear in the form of EMI, which can be a problem that must be solved in order to meet the specifications in the finished light module.
  • the present invention has been proposed to solve the above problems, and even if a voltage waveform rapidly increasing is applied to the power supply unit by a dimmer or the like, the current source is timed or gradually increases, so as to peaking voltage / current. It is an object of the present invention to provide an LED driving circuit having a time delay function of a current source that can fundamentally exclude a factor that prevents an LED malfunction or other normal driving caused by the LED.
  • the LED drive circuit having a time delay function of the current source includes a power input terminal to which an external AC power is applied and a dimmer connected to the power input terminal to receive an AC voltage.
  • the first LED includes the power supply unit including a rectifier circuit for the output voltage of the dimmer, and the nth LED located at the longest distance from the power supply unit, including the first LED located at the shortest distance from the connection point with the power supply unit.
  • a reference voltage generator for forming a reference voltage value, and a connection line between the power supply unit and a power input terminal of the first LED. Column is connected is configured to include a time delay circuit to raise the power supply voltage for the switching circuit of the power supply to gradually based on said reference voltage generation section voltage value.
  • the time delay circuit unit is connected between the first resistor (R 1 ) and the second resistor (R 2 ) connected in series and the first resistor (R 1 ) and the second resistor (R 2 ) so as to supply a power supply voltage (V RECT). ) ⁇
  • a delay cell including a comparator to which a voltage value of and a voltage value of voltage V TH are input, and a nat gate connected to an output terminal of the comparator, a switch turned on / off according to an output signal of the nat gate, and on of the switch.
  • a tilt control cell including a capacitor connected to or disconnected from the nat gate according to an on / off operation, and a third resistor connected in parallel with the capacitor;
  • the delay cell or the slope control cell is connected to the reference voltage generator, and when both the delay cell and the slope control cell are used, the slope control cell is connected to the reference voltage generator.
  • the time delay circuit unit may start charging the capacitor while the switch is short-circuited after a preset time t DLY. Is the reference voltage V dc of the entire circuit.
  • the time t R it takes for the capacitor to charge to the final charging voltage value is It is calculated through the equation, characterized in that to control the charging time t R by adjusting the value of the C R.
  • the time delay circuit unit may reduce the power supply voltage V RECT so that V RECT ⁇ When the state is ⁇ V TH , the switch is turned on so that the reference voltage of each of the switching circuit units is in a zero state.
  • the plurality of switching circuits further includes a common ground resistor that is commonly grounded, wherein the switching circuit unit is connected to the output terminal of the LED and the reference voltage and the reference voltage generator of the switching element and the common ground resistor connected to the common ground resistor; A comparator for comparing a common voltage of the common ground resistor, wherein the switching element is switched to either one of a first current path connected to the LED and a second current path connected to the common ground resistor according to the output of the comparator And varying a common voltage of the common ground resistor.
  • the switching circuit may be configured such that the comparator, the switching element, and the common ground resistor form negative feedback.
  • the switching element may be a field effect transistor (MOS FET) having a drain connected to an output terminal of the LED, a source connected to the common ground resistor, and a gate connected to the comparator.
  • MOS FET field effect transistor
  • reference voltage generating portion is V ref 1 ⁇ V ref 2 ... ⁇ V ref n is set according to the criterion.
  • the current source is timed or gradually increases to prevent malfunction of the LED or other normal driving due to the peaking voltage / current. It is possible to fundamentally exclude the elements, and in particular, it is possible to realize the flicker operation of the LED, to ensure the correct amount of light when the LED operation, and to prevent the electromagnetic shock of the elements of the LED driving circuit.
  • FIG. 1 is a view showing an example of a conventional AC direct type LED lighting device
  • FIG. 2 is a view illustrating the peaking phenomenon of the power supply voltage and the current peaking state according to the conventional AC direct type LED lighting device
  • FIG. 3 is a diagram illustrating an LED driving circuit having a time delay function of a current source according to an embodiment of the present invention.
  • FIGS. 4 to 6 are diagrams illustrating current waveforms of an LED driving circuit having a time delay function of a current source according to an embodiment of the present invention.
  • FIG. 7 and 9 are views showing a state confirmed through the simulation of the peaking current of the conventional AC direct type LED lighting device
  • FIG 8 and 10 are views showing a state confirmed through the simulation of the peaking current of the LED driving circuit having a time delay function of the current source according to an embodiment of the present invention
  • FIG. 11 is a view conceptually showing an LED driving circuit having a time delay function of a current source according to an embodiment of the present invention
  • FIG. 3 is a diagram illustrating an LED driving circuit having a time delay function of a current source according to an embodiment of the present invention.
  • the LED driving circuit (hereinafter referred to as "LED driving circuit") having a time delay function of the current source according to an embodiment of the present invention is a power supply unit 110, LED lighting unit 120, switching circuit unit 130 And a reference voltage generator 150 and a time delay circuit unit 160.
  • the LED driving circuit according to an exemplary embodiment of the present invention may further include a common ground resistor 140 in which the plurality of switching circuit units 130 are commonly grounded.
  • the power supply unit 110 includes a power input terminal (not shown) to which an external AC power (AC power, hereinafter referred to as "AC power supply”) is applied, and a dimmer 111 connected to the power input terminal and receiving AC power.
  • AC power AC power
  • the rectifier circuit 112 rectifies the output voltage of the dimmer 111.
  • the LED lighting unit 120 includes a plurality of LEDs 121 to 123, that is, starting with the first LED 121 and the first LED 121 located at the shortest distance from the connection point with the power supply unit 110.
  • the nth LED 123 is positioned at the longest distance from the power supply unit 110.
  • the first LED 121 is electrically connected to the power supply unit 110, and all of the LEDs 121 to 123 included in the first LED 121 and the lighting unit 120 are connected to each other in series.
  • the first LEDs 121 to n-th LEDs 123 are made of one LED, for example, but for convenience of illustration, the first LEDs 121 to n-th LEDs ( 123 may be in the form of a group in which two or more LEDs are connected in series.
  • the second LED 122 is in the form of a group 122a in which three LEDs are connected in series
  • the n-th LED 123 is in the form of a group 123a in which two LEDs are connected in series. .
  • the switching circuit unit 130 is individually connected to an output terminal of each of the LEDs 121 to 123 forming the LED lighting unit 120, and each of these switching circuit units 130 forms a current supply channel for the corresponding LEDs 121 to 123. do.
  • the switching circuit unit 130 may include a switching element 131 and a comparator 132.
  • the switching element 131 is individually connected to an output terminal of each of the LEDs 121 to 123 forming the LED lighting unit 120, and is connected to the common ground resistor 140.
  • the switching element 131 is a field effect transistor (MOS FET) as an example, the drain of the field effect transistor is connected to the output terminal of the LED (any one of 121 ⁇ 123), the source is a common ground resistor 140 ) And a gate connected to the comparator 132 as an example.
  • MOS FET field effect transistor
  • the comparator 132 compares the reference voltage of the reference voltage generator 150 with the common voltage of the common ground resistor 140.
  • the switching element 131 may be any one of a first current path connected to the LEDs 121 to 123 of the LED lighting unit 120 and a second current path connected to the common ground resistor 140 according to the output of the comparator 132. The switching operation to one side varies the common voltage of the common ground resistor 140.
  • the comparator 132, the switching element 131, and the common ground resistor 140 form a negative feedback.
  • the reference voltage generator 150 forms a reference voltage value for each of the switching circuits 130.
  • the reference voltage value of the comparator 132 included in the switching circuit unit 130 of the first LED 121 output terminal is referred to as V ref 1 and the comparator 132 included in the switching circuit unit 130 of the n-th LED output terminal 123.
  • V ref 1 the reference voltage value of the comparator 132 included in the switching circuit unit 130 of the n-th LED output terminal 123.
  • the reference voltage of the reference voltage generator 150 is V ref 1 ⁇ V ref 2 ... It is set according to the criteria of V ref n.
  • the time delay circuit unit 160 is connected in parallel to the connection line between the power supply unit 110 and the power input terminal of the first LED 121, the time delay circuit unit 160 is a power supply for the switching circuit unit 130 of the power supply unit 110 The voltage is gradually raised based on the voltage value of the reference voltage generator 150.
  • the time delay circuit unit 160 may include any one or both of the delay cell 161 and the slope control cell 162, when the delay cell 161 or the slope control cell 162 is used alone.
  • the delay cell 161 or the slope control cell 162 is connected to the reference voltage generator 150, and when the delay cell 161 and the slope control cell 162 are both used, the gradient control cell 162 generates the reference voltage. It is connected to the unit 150.
  • the configuration of the delay cell 161 and the tilt control cell 162 will be described below.
  • the delay cell 161 includes a first resistor 161a, a second resistor 161b, a comparator 161c, and a nat gate 161d.
  • the first resistor 161a and the second resistor 161b are connected in series with each other, and the comparator 161c is connected to the connection line between the first resistor 161a and the second resistor 161b so that the power supply voltage V RECT x And voltage V TH are input, respectively.
  • the nat gate 161d is connected to the output terminal of the comparator 161c.
  • the tilt control cell 162 includes a switch 162a, a capacitor 162b, and a third resistor 162c.
  • the switch 162a is turned on / off according to the output signal of the nat gate 161d, and the capacitor 162b is connected or disconnected from the nat gate 161d according to the on / off operation of the switch 162a,
  • the resistor 162c is connected in parallel with the capacitor 162b.
  • the switch 162a when the value of the power supply voltage (V RECT ) is greater than the voltage V TH , the switch 162a is shorted after the preset time t DLY . Charging is started on the capacitor 162b, and the final charged voltage value of the capacitor 162b is the reference voltage V dc of the entire circuit.
  • the time t R for the capacitor 162b to charge to the final charging voltage value is It is calculated through the equation, it is possible to control the charging time t R by adjusting the value of the C R.
  • V RECT the power supply voltage
  • each of the switching circuits 130 and all current sources for driving all the LEDs 121 to 123 of the LED lighting unit 120 have a current after a preset time t DLY in the state where the power supply voltage V RECT is applied. This current and its voltage rise for a time corresponding to the charging time t R to reach a normal value for stable operation of the LEDs 121 to 123.
  • the switching operations of all the switching circuits 130 are stopped, and then the above-described series of operations are performed when the power supply voltage is applied for the next period.
  • FIG. 4 shows that the charging voltage of the capacitor 162b is continuously connected to the LED driving circuit of the present embodiment. It shows the current waveform when the increasing method is applied.
  • FIG. 5 shows a current waveform when the LED driving circuit of the present embodiment is applied to a method in which the charging voltage of the capacitor 162b is gradually increased, and this method of FIG. 5 is applied to the practical application of the LED driving circuit according to the present invention. It is the most suitable form.
  • FIG. 6 shows a current waveform when the LED driving circuit of the present embodiment is applied in such a manner that the charging voltage of the capacitor 162b is continuously increased and is gradually increased.
  • FIGS. 7 to 10 are diagrams comparing a simulation result of an LED driving circuit according to an embodiment of the present invention with a phase of a peaking current of a conventional AC direct type LED lighting apparatus.
  • Figure 7 shows the peaking current state confirmed through the simulation of the conventional AC direct type LED lighting device, wherein the phase cut phase of the dimmer is an example of 45 °. As shown, it is confirmed that there is a current peaking at the total current and the current of each LED.
  • FIG. 8 illustrates a simulation result of the LED driving circuit according to an embodiment of the present invention, that is, the total current and each switching of the LED lighting unit 120 measured after adding a delay time and a tilt control function to a reference voltage.
  • This is a result of obtaining a current for each channel based on the circuit unit 130, wherein the phase cut phase of the dimmer is 45 ° as in FIG. As shown, it can be seen that the current peaking phenomenon completely disappeared in the total current of the LED lighting unit 120 and the current for each channel.
  • phase cut phase of the dimmer is 20 ° under the same conditions as in FIGS. 7 and 8, and the simulation result is the same as that of FIGS. 7 and 8, and thus description thereof is omitted. do.
  • FIG. 11 is a view conceptually showing an LED driving circuit (hereinafter, referred to as an “LED driving circuit”) having a time delay function of a current source according to an embodiment of the present invention, that is, the LED lighting unit 220 through the LED driving circuit.
  • the graph illustrates a process of reaching a driving state through a time delay process in which a current source passes from an supply and delay time interval to an incremental time interval.
  • the power of the power supply unit 210 is supplied to the time delay unit 250 through the on operation of the power on / off operation unit 240 to perform the "power on confirmation" operation of the figure, accordingly the time delay unit
  • the reference numeral 250 defers the supply of the power current to the switching circuit unit 230 for a predetermined time based on the set current value of each switching circuit unit 230 of the current source controller 260 (corresponding to the reference voltage generator of FIG. 3). do.
  • the time delay unit 250 does not immediately supply a set current value of the current source controller 260 when the power current is applied to the switching circuit unit 230 after a delay time of the power current, but gradually increases the power current to increase the LED lighting unit ( 220 to the current value required for driving.
  • the current source has a time difference or gradually increases. Operation can fundamentally eliminate the LED malfunction due to peaking voltage / current or other factors that hinder normal operation.In particular, it prevents flickering of the LED, guarantees the correct amount of light when the LED is operating, and the LED driving circuit as a whole. Implement electromagnetic shock protection of the devices.

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

Abstract

La présente invention concerne un circuit d'attaque de DEL, ayant une fonction de retard d'une source de courant, qui comprend : une unité d'alimentation électrique qui comprend une borne d'entrée électrique à laquelle un courant alternatif (CA) externe est appliqué, un gradateur connecté à la borne d'entrée de courant et recevant une tension alternative, et un circuit de redressement pour une tension de sortie provenant du gradateur ; une unité d'éclairage à DEL qui comprend une première DEL, qui est située à la distance la plus courte entre le point de connexion et l'unité d'alimentation électrique, jusqu'à une énième DEL, qui est située à la distance la plus longue à partir de l'unité d'alimentation électrique, et dans laquelle la première DEL est connectée à l'unité d'alimentation électrique et chaque DEL est connectée en série ; une pluralité de circuits de commutation qui sont individuellement connectés à la borne de sortie de chaque DEL formant l'unité d'éclairage à DEL et qui forment un canal d'alimentation en courant pour une DEL correspondante ; une unité de génération de tension de référence qui forme une valeur de tension de référence pour chacun des circuits de commutation ; une unité de circuit de retard qui est connectée en parallèle à la ligne de connexion entre les bornes d'entrée électriques de l'unité d'alimentation électrique et la première DEL et qui augmente de manière graduelle une tension de source pour le circuit de commutation de l'unité d'alimentation électrique sur la base de la valeur de tension de l'unité de génération de tension de référence.
PCT/KR2013/007435 2012-08-20 2013-08-19 Circuit de commande de del à fonction de retard de source de courant WO2014030895A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR10-2012-0090668 2012-08-20
KR1020120090668A KR101400475B1 (ko) 2012-08-20 2012-08-20 전류원의 시간지연 기능을 갖는 엘이디 구동회로

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WO2014030895A1 true WO2014030895A1 (fr) 2014-02-27

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WO (1) WO2014030895A1 (fr)

Cited By (3)

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Publication number Priority date Publication date Assignee Title
CN105764196A (zh) * 2016-04-06 2016-07-13 上海联矽智能科技有限公司 一种降低纹波的线性驱动方法
WO2018119819A1 (fr) * 2016-12-29 2018-07-05 Texas Instruments Incorporated Compensation adaptative du temps de retard de mise hors tension pour dispositif de commande de del
CN112788812A (zh) * 2019-11-07 2021-05-11 华润微集成电路(无锡)有限公司 线性led驱动系统及驱动方法

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KR102277126B1 (ko) 2014-06-24 2021-07-15 삼성전자주식회사 Led 구동 장치 및 조명 장치
KR101626360B1 (ko) * 2014-09-24 2016-06-01 메를로랩 주식회사 교류 led 구동회로
CN106322159A (zh) * 2016-10-19 2017-01-11 漳州立达信光电子科技有限公司 Led灯丝灯

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KR100952499B1 (ko) * 2007-12-10 2010-04-13 주식회사 그린씨앤씨텍 병렬 발광다이오드 정전류 구동 회로
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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105764196A (zh) * 2016-04-06 2016-07-13 上海联矽智能科技有限公司 一种降低纹波的线性驱动方法
WO2018119819A1 (fr) * 2016-12-29 2018-07-05 Texas Instruments Incorporated Compensation adaptative du temps de retard de mise hors tension pour dispositif de commande de del
US10111285B2 (en) 2016-12-29 2018-10-23 Texas Instruments Incorporated Adaptive turn-off delay time compensation for LED controller
CN112788812A (zh) * 2019-11-07 2021-05-11 华润微集成电路(无锡)有限公司 线性led驱动系统及驱动方法
CN112788812B (zh) * 2019-11-07 2023-07-18 华润微集成电路(无锡)有限公司 线性led驱动系统及驱动方法

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