CN106714368A - Novel LED driving control method - Google Patents
Novel LED driving control method Download PDFInfo
- Publication number
- CN106714368A CN106714368A CN201611042817.0A CN201611042817A CN106714368A CN 106714368 A CN106714368 A CN 106714368A CN 201611042817 A CN201611042817 A CN 201611042817A CN 106714368 A CN106714368 A CN 106714368A
- Authority
- CN
- China
- Prior art keywords
- led
- current
- luminous flux
- ref
- signal
- Prior art date
- Legal status (The legal status 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 status listed.)
- Granted
Links
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]
- H05B45/10—Controlling the intensity of the light
Abstract
The invention relates to a novel LED driving control method. The method is characterized in that through sampling an output voltage signal u of an LED driving circuit, the output voltage signal is sent to a current controller; and the current controller acquires a reference current signal iref corresponding to a set reference luminous flux phiref through a specific algorithm, the reference current signal iref is compared to an output current id of an LED driver so as to acquire an error signal epsilon, and acquires a control signal via a compensation network. Under control of the control signal, a driver provides a forward current signal which is the same with the reference current signal iref generated by the current controller for an LED load so that the LED load generates a luminous flux which is maintained to be consistent with the reference luminous flux phiref and luminous flux control is realized. By using the method of the invention, accurate control of an LED output luminous flux can be realized.
Description
Technical field
The present invention relates to LED drive control strategies field, particularly a kind of New LED drive control method.
Background technology
LED electric light sources application scenario is more next extensively, it is small to display, field is indicated, greatly to road lighting, medical treatment, aviation etc.
Leading-edge field high.What these utilizations had only needs to LED can produce light output, play simple indicative function, and what is had but needs
Can be to LED output light precise control.The drive control of LED is all can't do without in which kind of application.
LED drive control strategies common at present are current constant control and power limitation control.The size of the output light flux of LED
Size not only with forward current is relevant, and closely related with the height of junction temperature of chip.From modeling analysis, the change of junction temperature
Change can not only influence the size of input electric power, while can also influence electric energy to be converted to the conversion ratio size of luminous energy.Current constant control
When, when the larger rising of junction temperature of chip, the forward voltage of LED will decline, and input power declines, and LED chip will appear from obvious light
Decline phenomenon, that is, output light flux is decreased obviously；During power limitation control, when the larger rising of junction temperature of chip, the forward voltage of LED
Decline, power limitation control makes up the decline of the voltage caused by junction temperature is raised by the corresponding size for improving input current, but by
Rise with the decline of forward voltage in heating coefficient, still can cause the decline of luminous flux, therefore power limitation control is not yet
Can effectively improve causes the sharp-decay of LED light flux because temperature is raised.
In variations injunction temperature than larger or higher to output light quality requirement occasion, LED output light fluxs are realized
Precise control, current constant control and power limitation control are difficult to meet such requirement, so, the mesh based on optimization LED light characteristic
, it is very necessary to study new LED drive control strategies.
The content of the invention
In view of this, the purpose of the present invention is to propose to a kind of New LED drive control method, at the same consider forward current and
Influence of the temperature variable to LED output light fluxs, improves traditional current constant control and power limitation control mode often because of larger temperature
Spend the situation that the luminous flux caused by rising drastically declines.And by forward voltage argument table temperature displaying function information, it is easy to the control
Tactful implementing in LED drive circuit.
The present invention is realized using following scheme：A kind of New LED drive control method, specifically includes following steps：
Step S1：According to LED chip, LED light electric model is set up, and obtain with luminous flux phi and forward voltage U as variable
Forward current IdAlgorithm model Id=f-1(φ, U)；
Step S2：In current controller, the reference value Φ of LED light flux needed for settingref, LED driving transducers of sampling
Output voltage U, and based on the forward current I obtained by step S1dAlgorithm model, obtain corresponding current reference signal iref；
Step S3：The current reference signal i that current controller is producedrefWith the output current sampled signal of LED driver
idIt is compared and obtains error signal, and a control signal is obtained by corresponding compensation network, is controlled using the control signal
It is i that LED driver produces a sizerefElectric current output.
Further, step S1 specifically includes following steps：
Step S11：If LED forward direction input currents are less than 1A, based on LED forward direction C-V characteristics and by Taylor series expansion
Analysis can obtain LED power PdWith forward current IdBetween approximately linear, its relational expression is as follows：
Pd=aId+b (1)
Wherein, a, b are constant, the actual measurement P that its value size passes through specific LED chipdWith IdData are obtained；
Step S12：If the forward current I of LEDdConstant, its forward voltage U can be with junction temperature TjIncrease and approximately linear subtracts
It is few, LED heat is hindered into RjRegard constant, forward voltage U and heatsink temperature T ashsLinear relationship can be approximately, its relational expression is as follows：
Ths=cU+d (2)
Wherein, c, d are constant, the actual measurement T that its value size passes through specific LED chiphsObtained with U data；
Step S13：It is P to define LED heating powersh, itself and input electric power PdBetween relation can be expressed with following formula：
Ph=KhPd (3)
Wherein, KhBe heating coefficient, i.e. electric conversion efficiency, be used to determine LED for generate heat with the size of luminous power；
Step S14：As fixed forward direction input current IdWhen, COEFFICIENT K of generating heathBy the rising with heatsink temperature it is linear on
Rise；As fixing cooling fins temperature ThsWhen, COEFFICIENT K of generating heathBy with the rising of positive input current also linear rise.Therefore, it is based on
Relational expression (2), can be able to forward voltage U and forward current IdIt is the heating COEFFICIENT K of variablehModular form：
Kh(U,Id)=(k1U+k2)(k3Id+k4)/γ (4)
Wherein, coefficient k1、k2、k3、k4, γ provided by LED chip producer or experimental results obtain；
Step S15：According to formula (1), (2), (3), (4), the light electric model of LED chip junction temperature is obtained：
Step S16：If positive input current IdIt is constant, the light efficiency E and junction temperature T of LEDjBetween there is linear approximate relationship, can
It is expressed as following formula：
E=E0[1+ke(Tj-T0)] (6)
Wherein, keIt is light efficiency variation with temperature rate, keLess than zero；T0It is 25 DEG C of junction temperature, E0It is 25 DEG C of corresponding volumes of junction temperature
Determine light efficiency, the value size and input rated current IdIt is relevant；
Step S17：The relation of the Φ and light efficiency E according to luminous flux, with reference to (1), (5), (6) formula, obtains with electric current and electricity
Press the light electric model of the N LEDs chip luminous fluxes for variable, such as following formula：
Step S18：The parameter of specific LED chip is substituted into, specific LED photovoltaic model expression is obtained, and further
Reverse goes out the forward current I with luminous flux phi and forward voltage U as variabledAlgorithm model, such as following formula：
Id=f-1(φ,U) (8)。
Further, the control signal is duty cycle signals.
Further, one and luminous flux phi be can obtain according to (8)ref, LED forward voltages U it is corresponding current reference letter
Number iref, by current reference signal irefWith the output current sampled signal i of LED driverdIt is compared and obtains error signal, and
One duty cycle control signal is obtained by corresponding compensation network, the break-make of driver switch is controlled, and then send LED load
Luminous flux be setting Φref。
Compared with prior art, the present invention has following beneficial effect：The present invention considers forward current and temperature variable simultaneously
Influence to LED output light fluxs, improves under traditional current constant control and power limitation control mode, often because larger temperature rises
The situation that caused luminous flux drastically declines.And by forward voltage argument table temperature displaying function information, it is easy to the control strategy to exist
Implementing in LED drive circuit.
Brief description of the drawings
Fig. 1 is the principle schematic of the embodiment of the present invention.
Fig. 2 is application of the embodiment of the present invention in LED chip, and specially CREE XPG R4 chips are in different positive electricity
Pressure, forward current with light flux variations schematic diagram.
Fig. 3 be the embodiment of the present invention in CREE XPG R4 chips respectively permanent luminous flux control and constant current, power limitation control
Under, the curve map that forward current changes with forward voltage.
Fig. 4 be the embodiment of the present invention in CREE XPG R4 chips respectively permanent luminous flux control and constant current, power limitation control
Under strategy, the curve map that luminous flux changes with forward voltage.
Fig. 5 is a specific embodiment of the present invention on Flyback drive circuits.
Specific embodiment
Below in conjunction with the accompanying drawings and embodiment the present invention will be further described.
As shown in figure 1, present embodiments providing a kind of New LED drive control method, mainly there are driver, current control
Device and compensation network etc..Specifically include following steps：
Step S1：According to LED chip, LED light electric model is set up, and obtain with luminous flux phi and forward voltage U as variable
Forward current IdAlgorithm model Id=f-1(φ, U)；
Step S2：In current controller, the reference value Φ of LED light flux needed for settingref, LED driving transducers of sampling
Output voltage U, and based on the forward current I obtained by step S1dAlgorithm model, obtain corresponding current reference signal iref；
Step S3：The current reference signal i that current controller is producedrefWith the output current sampled signal of LED driver
idIt is compared and obtains error signal, and a control signal is obtained by corresponding compensation network, is controlled using the control signal
It is i that LED driver produces a sizerefElectric current output.
In the present embodiment, with Cree companies XPG R4 chip assemblies when heatsink temperature is as 50 DEG C, acquired reality
Data instance is tested, the determination process of the design parameter of LED light electric model is discussed in detail：
LED forward direction input current be less than 1A when, based on LED forward direction C-V characteristic and by Taylor series expansion analysis can
Obtain LED power PdWith forward current IdBetween approximately linear, its relational expression such as (1)：
Pd=aId+b (1)
The P of the Cree XPG R4 chips according to actual measurementdWith IdData, can linear fit obtain a=3.2409, b=-
0.09964。
As the forward current I of LEDdWhen constant, its forward voltage U can be with junction temperature TjIncrease and approximately linear reduce.This core
Piece RjIt is 15 DEG C/W, forward voltage U and heatsink temperature ThsLinear relationship (2) can be approximately：
Ths=cU+d (2)
According to actual measurement Cree XPG R4 chips under different heatsink temperatures ThsWith U data, linear fit obtains c=-
394.74, d=1186.3.
It is P to define LED heating powersh, itself and input electric power PdBetween relation can be expressed with formula (3).
Ph=KhPd (3)
K in formulahIt is heating coefficient, i.e. electric conversion efficiency；It will determine that LED is used for the size generated heat with luminous power.
As fixed forward direction input current IdWhen, COEFFICIENT K of generating heathThe linear rise by the rising with heatsink temperature；Work as fixation
Heatsink temperature ThsWhen, COEFFICIENT K of generating heathBy with the rising of positive input current also linear rise.Therefore, based on relational expression (2),
Forward voltage U and positive input current I can be able todIt is the heating COEFFICIENT K of variablehModular form (4)：
Kh(U,Id)=(k1U+k2)(k3Id+k4)/γ (4)
The coefficient k of Cree XPG R4 chips is can obtain by specific experiment data1=-2.4353, k2=7.56, k3=
0.173、k4=0.6064, γ=0.663.
According to formula (1), (2), (3), (4), the light electric model (5) of LED chip junction temperature can be further arrived：
Positive input current IdIt is constant, the light efficiency E and junction temperature T of LEDjBetween there is linear approximate relationship, be represented by formula
(6)：
E=E0[1+ke(Tj-T0)] (6)
The k of CreeXPG R4 chips is obtained by the result of Experiments of OpticsE=-0.012；T0For 25 DEG C of junction temperature, its is corresponding
Specified light efficiency E0It is 69.282lm/W.
The relation of the Φ and light efficiency E according to luminous flux, with reference to (1), (5), (6) formula, can obtain with electric current and voltage is change
The light electric model of the LED light flux of amount, such as formula (7)：
The design parameter for building light electric model of Cree XPG R4 chips is shown in Table 1.
The XPG R4 chip model parameters of table 1
| k1(/V) | k2 | k3(/A) | k4 | a(V) | b(W) | c(℃/V) |
| -2.4353 | 7.56 | 0.173 | 0.6064 | 3.2409 | -0.09964 | -394.74 |
| d(℃) | E0(lm/W) | T0(℃) | Rj(℃/W) | ke | γ | N |
| 1186.3 | 69.282 | 60.149 | 15 | -0.012 | 0.663 | 9 |
The step of repeating the above can obtain the change curve of the luminous flux and forward current under different voltages, such as Fig. 2 institutes
Show.Each forward voltage U forward current Is corresponding with luminous flux phi in Fig. 2d, this is the current algorithm of current controller
Foundation.
In the present embodiment, the main present invention that introduces puies forward a kind of New LED drive control method in LED perseverance luminous flux controls
In application.With CREE XPG R4 chips as research object, when 10 DEG C of heatsink temperature, during forward current 0.314A, positive electricity
It is 2.978V to press, and input power 0.93W, output light flux is 106.23lm.Analyzed by simulation software, obtain chip difference
Under permanent luminous flux control, current constant control, power limitation control strategy, the curve map that chip forward current changes with forward voltage,
As shown in Figure 3；The curve map that chip luminous flux changes with forward voltage, as shown in Figure 4.From Fig. 3, Fig. 4, temperature is logical to light
The influence of amount is larger, to overcome its influence, really to realize the invariable control of luminous flux, it is necessary to significantly change positive electricity
The size of stream.The constant purpose of output light flux can not be realized using current constant control and power limitation control strategy.Only persevering light leads to
Amount control could realize luminous flux constant control truly.
The present embodiment puies forward a kind of new drive control method, the one embodiment applied in specific LED drive circuit,
As shown in Figure 5.The main circuit of LED driver is Flyback converters.The reference of luminous flux needed for being set in current controller
Value ΦrefAnd with the output voltage sampled value of Flyback converters, corresponding current reference signal is obtained by current algorithm
iref；The current reference signal i of the generation of current controllerrefWith the output current sampled signal i of Flyback convertersdThrough by mistake
Difference amplifier relatively obtains an error signal, and the error signal is passed through by the control circuit for being sent to transformer primary side of optocoupler
One PWM adjustment units produce pwm signal, and controlling switch pipe break-make makes Flyback converters produce size to reach irefElectric current is carried
Supply LED load, even if the luminous flux that LED is produced is Φref。
A preferred embodiment of the invention is the foregoing is only, the driving that the invention is applied to all suitable LED is converted
Circuit.All impartial changes done according to scope of the present invention patent and modification, should all belong to covering scope of the invention.
Claims (4)
1. a kind of New LED drive control method, it is characterised in that：Comprise the following steps：
Step S1：According to LED chip, LED light electric model is set up, and obtain with luminous flux phi and forward voltage U as variable just
To electric current IdAlgorithm model Id=f-1(φ, U)；
Step S2：In current controller, the reference value Φ of LED light flux needed for settingref, the defeated of LED driving transducers of sampling
Go out voltage U, and based on the forward current I obtained by step S1dAlgorithm model, obtain corresponding current reference signal iref；
Step S3：The current reference signal i that current controller is producedrefWith the output current sampled signal i of LED driverdEnter
Row compares and obtains error signal, and obtains a control signal by corresponding compensation network, is driven using control signal control LED
It is i that dynamic device produces a sizerefElectric current output.
2. a kind of New LED drive control method according to claim 1, it is characterised in that：Step S1 specifically include with
Lower step：
Step S11：If LED forward direction input currents are less than 1A, analyzed based on LED forward direction C-V characteristics and by Taylor series expansion
Can obtain LED power PdWith forward current IdBetween approximately linear, its relational expression is as follows：
Pd=aId+b (1)
Wherein, a, b are constant, the actual measurement P that its value size passes through specific LED chipdWith IdData are obtained；
Step S12：If the forward current I of LEDdConstant, its forward voltage U can be with junction temperature TjIncrease and approximately linear reduce, will
LED heat hinders RjRegard constant, forward voltage U and heatsink temperature T ashsLinear relationship can be approximately, its relational expression is as follows：
Ths=cU+d (2)
Wherein, c, d are constant, the actual measurement T that its value size passes through specific LED chiphsObtained with U data；
Step S13：It is P to define LED heating powersh, itself and input electric power PdBetween relation can be expressed with following formula：
Ph=KhPd (3)
Wherein, KhBe heating coefficient, i.e. electric conversion efficiency, be used to determine LED for generate heat with the size of luminous power；
Step S14：Calculate with forward voltage U and forward current IdIt is the heating COEFFICIENT K of variablehModular form：
Kh(U,Id)=(k1U+k2)(k3Id+k4)/γ (4)
Wherein, coefficient k1、k2、k3、k4, γ provided by LED chip producer or experimental results obtain；
Step S15：According to formula (1), (2), (3), (4), the light electric model of LED chip junction temperature is obtained：
Step S16：If positive input current IdIt is constant, the light efficiency E and junction temperature T of LEDjBetween there is linear approximate relationship, can represent
It is following formula：
E=E0[1+ke(Tj-T0)] (6)
Wherein, keIt is light efficiency variation with temperature rate, keLess than zero；T0It is 25 DEG C of junction temperature, E0It is 25 DEG C of corresponding normal lights of junction temperature
Effect, the value size and input rated current IdIt is relevant；
Step S17：The relation of Φ according to luminous flux and light efficiency E, with reference to (1), (5), (6) formula, obtain be with electric current and voltage
The light electric model of the N LEDs chip luminous fluxes of variable, such as following formula：
Step S18：The parameter of specific LED chip is substituted into, specific LED photovoltaic model expression, and further reverse is obtained
Go out the forward current I with luminous flux phi and forward voltage U as variabledAlgorithm model, such as following formula：
Id=f-1(φ,U) (8)。
3. a kind of New LED drive control method according to claim 1, it is characterised in that：The control signal is to account for
Sky compares signal.
4. a kind of New LED drive control method according to claim 1,2 or 3, it is characterised in that：Each setting
Luminous flux phirefA positive reference current i all corresponding with LED forward voltages Uref, controlling the reality that LED load is obtained just
To electric current idFor the reference current i that LED driver is producedref, and then make the Φ that the luminous flux that LED load sends is settingref。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611042817.0A CN106714368B (en) | 2016-11-24 | 2016-11-24 | A kind of New LED drive control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611042817.0A CN106714368B (en) | 2016-11-24 | 2016-11-24 | A kind of New LED drive control method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106714368A true CN106714368A (en) | 2017-05-24 |
| CN106714368B CN106714368B (en) | 2018-09-18 |
Family
ID=58933799
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611042817.0A Expired - Fee Related CN106714368B (en) | 2016-11-24 | 2016-11-24 | A kind of New LED drive control method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106714368B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107590326A (en) * | 2017-08-31 | 2018-01-16 | 江苏大学 | The simulation model and emulation mode of a kind of LED module |
| CN112702814A (en) * | 2020-12-21 | 2021-04-23 | 中国人民解放军战略支援部队信息工程大学 | Bias current optimization method and system based on LED electric heating model |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202258255U (en) * | 2011-10-11 | 2012-05-30 | 深圳Tcl新技术有限公司 | Light-emitting diode (LED) driving device, LED light source module and liquid crystal display |
| CN104717781A (en) * | 2013-12-11 | 2015-06-17 | 台达电子企业管理（上海）有限公司 | Light adjusting device and method |
| CN104853486A (en) * | 2015-04-27 | 2015-08-19 | 欧普照明股份有限公司 | PWM-based light adjusting circuit |
-
2016
- 2016-11-24 CN CN201611042817.0A patent/CN106714368B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202258255U (en) * | 2011-10-11 | 2012-05-30 | 深圳Tcl新技术有限公司 | Light-emitting diode (LED) driving device, LED light source module and liquid crystal display |
| CN104717781A (en) * | 2013-12-11 | 2015-06-17 | 台达电子企业管理（上海）有限公司 | Light adjusting device and method |
| CN104853486A (en) * | 2015-04-27 | 2015-08-19 | 欧普照明股份有限公司 | PWM-based light adjusting circuit |
Non-Patent Citations (1)
| Title |
|---|
| 徐玉珍 等: "《一种简化变量的新型LED光电热模型》", 《光学学报》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107590326A (en) * | 2017-08-31 | 2018-01-16 | 江苏大学 | The simulation model and emulation mode of a kind of LED module |
| CN107590326B (en) * | 2017-08-31 | 2020-06-09 | 江苏大学 | Simulation model and simulation method of LED module |
| CN112702814A (en) * | 2020-12-21 | 2021-04-23 | 中国人民解放军战略支援部队信息工程大学 | Bias current optimization method and system based on LED electric heating model |
| CN112702814B (en) * | 2020-12-21 | 2023-03-31 | 中国人民解放军战略支援部队信息工程大学 | Bias current optimization method and system based on LED electric heating model |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106714368B (en) | 2018-09-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Pinto et al. | A new technique to equalize branch currents in multiarray LED lamps based on variable inductors | |
| TWI441556B (en) | Circuit and method for controlling a plurality of light sources, and system of a plurality of light sources | |
| CN103390993B (en) | Load driving circuit and method and lamp | |
| Dong et al. | Circuit theoretic considerations of LED driving: Voltage-source versus current-source driving | |
| CN104812121B (en) | Led drive circuit | |
| CN103379687B (en) | Semiconductor circuit and semiconductor apparatus | |
| CN103857152A (en) | Power system with multiplexed output | |
| CN104904314B (en) | Reduce the LED driver circuit of Observable optical flicker using flyback converter by reducing rectification AC power network ripple | |
| US10645767B2 (en) | Linear regulated dimmable LED driver for DC distributed lighting system | |
| CN106455227A (en) | LED linear constant current control circuit and LED luminous device | |
| CN106714368A (en) | Novel LED driving control method | |
| Fang et al. | A multiplexing ripple cancellation LED driver with true single-stage power conversion and flicker-free operation | |
| CN102361525A (en) | Light emitting diode circuit and method thereof | |
| Zhang et al. | A high-efficiency quasi-two-stage LED driver with multichannel outputs | |
| CN103874288A (en) | LED (light emitting diode) light bar driving circuit and LCD (liquid crystal display) television | |
| CN106533187B (en) | Drive control method and circuit | |
| Zhang et al. | A color-theory-based chromaticity coordinates tracking strategy for LED color-mixing system | |
| CN106937440B (en) | A kind of LED perseverances photoelectric current drive control method | |
| Bodetto et al. | Improving the dimming performance of low-power single-stage AC–DC HBLED drivers | |
| CN203289699U (en) | LED (light-emitting diode) high-power drive circuit | |
| Fu et al. | A high efficiency multi-channel LED driver based on converter-free technique and load adaptive method | |
| CN104270875A (en) | LED (Light Emitting Diode)-driven control device and method | |
| CN103796398A (en) | Circuit and method for driving multiple LED light strings connected in parallel | |
| Sun et al. | A Capacitorless and Low‐Optical‐Flicker AC Direct LED Driving IC and System Applied to Street Lighting | |
| Park et al. | LED driver with self-optimized channel voltage: A switch-mode voltage regulator optimizes an active current regulator for a LED driver |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180918 Termination date: 20211124 |