CN109379806A - A kind of dimming driving circuit, light adjusting controller and LED lamp - Google Patents
A kind of dimming driving circuit, light adjusting controller and LED lamp Download PDFInfo
- Publication number
- CN109379806A CN109379806A CN201811219243.9A CN201811219243A CN109379806A CN 109379806 A CN109379806 A CN 109379806A CN 201811219243 A CN201811219243 A CN 201811219243A CN 109379806 A CN109379806 A CN 109379806A
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- 238000001514 detection method Methods 0.000 claims abstract description 23
- 230000006641 stabilisation Effects 0.000 claims abstract description 21
- 238000011105 stabilization Methods 0.000 claims abstract description 21
- 238000002955 isolation Methods 0.000 claims abstract description 15
- 239000004065 semiconductor Substances 0.000 claims description 15
- 239000003990 capacitor Substances 0.000 claims description 11
- 238000001914 filtration Methods 0.000 claims description 10
- 230000005611 electricity Effects 0.000 claims description 7
- 230000008878 coupling Effects 0.000 claims 1
- 238000010168 coupling process Methods 0.000 claims 1
- 238000005859 coupling reaction Methods 0.000 claims 1
- 238000001727 in vivo Methods 0.000 claims 1
- 230000005622 photoelectricity Effects 0.000 claims 1
- 238000006243 chemical reaction Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 230000008901 benefit Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 206010044565 Tremor Diseases 0.000 description 1
- 238000010009 beating Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
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- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The present invention discloses a kind of dimming driving circuit, including sequentially connected EMI filter circuit, rectification circuit, pfc circuit and constant-current drive circuit, it further include being sequentially connected phase stabilization and detection circuit, isolation circuit and MCU adjusting circuit, the phase stabilization and the input terminal of detection circuit are connect with the rectification circuit, and the output end that the MCU adjusts circuit is connect with the constant-current drive circuit.The present invention detects the AC phases state of phase signal by phase stabilization and detection circuit, and is converted by two kinds of light-modulating modes that MCU adjusts circuit, and 1% depth light modulation below may be implemented, and it is unstable to solve the problems, such as that existing 5% or less light modulator light modulation occurs.
Description
Technical field
The present invention relates to LED to dim actuation techniques field, and in particular to a kind of dimming driving circuit.
Background technique
Compared with conventional light source, for LED illumination other than having many advantages, such as green, energy-saving and environmental protection, tunable optical is also a weight
The advantages of wanting.Common dimming mode includes simulation light modulation, PWM light modulation, switch on wall light modulation and alternating current phase dimming.
Alternating current phase dimming is currently used light-dimming method.Fig. 1 is please referred to, it is former that Fig. 1 show existing phase dimming
Manage block diagram comprising sequentially connected alternating current input power supplying 101, phase dimmer 102, dimming driving circuit 103 and LED lamp
104, phase dimmer 102 controls the phase of the every half period of input AC electricity, and dimming driving circuit 103 is according to friendship
The phase angle size of galvanic electricity conducting exports corresponding electric current to LED lamp 104, achievees the purpose that adjust lamp brightness.
Phase dimmer 102 needs one the smallest holding electric current when controlling AC phases on and off, to keep
The normal work of phase dimmer 102, when phase angle conducting, 103 power conversion operation of dimming driving circuit is normal, consumption
Electric current be able to maintain the normal work of phase dimmer 102；But when phase angle is ended, the conversion of 103 power of dimming driving circuit
Become minimum operation or converted without power, the electric current very little that dimming driving circuit 103 consumes at this time is not able to satisfy phase tune
The minimum of light device 102 keeps current requirements, to the unstable phenomenon of brightness occur, and also can between out of phase light modulator
It is variant.
Existing phase dimmer is typically only capable to be adjusted to 10%~5% brightness, when brightness adjustment will to 5% or less
There is wild effect.
Summary of the invention
In view of the deficiencies of the prior art, the present invention provides a kind of dimming driving circuit, for solving existing phase dimmer
It will appear unstable problem in 5% or less brightness adjustment to.
The contents of the present invention are as follows:
A kind of dimming driving circuit, including sequentially connected EMI filter circuit, rectification circuit, pfc circuit and constant current driving
Circuit further includes being sequentially connected phase stabilization and detection circuit, isolation circuit and MCU adjusting circuit, the phase stabilization and inspection
The input terminal of slowdown monitoring circuit is connect with the rectification circuit, and the MCU adjusts the output end of circuit and the constant-current drive circuit connects
It connects.
Preferably, the phase stabilization and detection circuit include the first divider resistance, the second divider resistance, pull down resistor
R7, metal-oxide-semiconductor Q1, zener diode Z1 and triode Q2, the input terminal of first divider resistance and the rectification circuit
Connection, the connecting node are node A, and the output end of first divider resistance is connect with the drain electrode of metal-oxide-semiconductor Q1, the source of metal-oxide-semiconductor
Pole ground connection, the grid of metal-oxide-semiconductor Q1 are connect with first voltage end Vcc, and the input terminal of second divider resistance is connect with node A,
The output end of second divider resistance is connect with one end of pull down resistor R7, which is node B, pull down resistor R7's
Other end ground connection, the cathode of zener diode Z1 are connect with node B, and the anode of zener diode Z1 connects with the base stage of triode Q2
It connects, the emitter ground connection of triode Q2, the collector of triode Q2 is connect with first voltage end Vcc, the collector of triode Q2
For the output end of phase stabilization and detection circuit, the positive and negative anodes of zener diode Z1 pass through filter capacitor C2 and C1 ground connection respectively.
Preferably, the isolation circuit includes photoelectrical coupler U1 and diode D1, and the diode of photoelectrical coupler U1 is defeated
Enter end to connect by resistance R11 with first voltage end Vcc, the diode output of photoelectrical coupler U1 and the anode of diode D1
Connection, the cathode of diode D1 connect with the phase stabilization with detection circuit, the transistor collector of photoelectrical coupler U1 and
The Vdd connection of second voltage end, the transistor emitter of photoelectrical coupler U1 are grounded by pull down resistor R51, photoelectrical coupler U1
Triode emission extremely isolation circuit output end.
Preferably, it includes MCU processor U51, the power pins of MCU processor U51 and the second electricity that the MCU, which adjusts circuit,
Pressure side Vdd connection, and being grounded by filter capacitor C51, the 5th common pin GP4 of MCU processor U51 are input terminal, at MCU
The 5th common pin GP4 of reason device U51 is connect by π type RC filter network with the isolation circuit, and the of MCU processor U51
Three common pin GP2 are the first output end, and the third common pin GP2 is driven by RC parallel filtering circuit and the constant current
6th common pin GP5 of circuit connection, MCU processor U51 is second output terminal, and the 6th common pin GP5 passes through electricity
Resistance R55 is connect with the constant-current drive circuit.
Preferably, the EMI filter circuit includes the first inductance LF1 and the second inductance LF2, the input of the first inductance LF1
End is connect with AC input, and the input terminal of the first inductance LF1 is also connected with varistor VDR1 and safety element F1, and first
The output end of inductance LF1 is connect with the input terminal of the second inductance LF2, and the output end of the first inductance LF1 is also connected with RC series connection filter
The output end of wave circuit, the second inductance LF2 is connect with the rectification circuit, and the output end of the second inductance LF2 is also connected with pressure-sensitive
Resistance VDR2, is parallel with resistance R2 and R3 between the input terminal and output end of the second inductance LF2.
Invention additionally discloses a kind of light adjusting controllers, the dimmer switch including shell and setting on the housing, institute
It states and is provided with above-mentioned dimming driving circuit in shell.
Invention additionally discloses a kind of LED lamp, including above-mentioned dimming driving circuit and with the dimming driving circuit
The LED light of connection.
The invention has the benefit that the present invention detects the AC phases of phase signal by phase stabilization and detection circuit
State, and converted by two kinds of light-modulating modes that MCU adjusts circuit, 1% depth light modulation below may be implemented, solve existing tune
There is unstable problem in the light modulation of 5% or less light device.
Detailed description of the invention
Fig. 1 show existing phase dimming functional block diagram；
Fig. 2 show the functional block diagram of present pre-ferred embodiments；
Fig. 3 show the circuit diagram of present pre-ferred embodiments；
Fig. 4 show the waveform diagram of each node when the phase-detection of present pre-ferred embodiments.
Specific embodiment
The above description is only an overview of the technical scheme of the present invention, in order to better understand the technical means of the present invention,
And it can be implemented in accordance with the contents of the specification, and in order to allow above and other objects, features and advantages of the invention can
It is clearer and more comprehensible, it is special below to lift preferred embodiment, and cooperate attached drawing, detailed description are as follows.
Referring to figure 2., a kind of dimming driving circuit disclosed in the present embodiment, including sequentially connected EMI filter circuit
202, rectification circuit 203, pfc circuit 204 and constant-current drive circuit 205, further include being sequentially connected phase stabilization and detection circuit
206, isolation circuit 207 and MCU adjust circuit 208, the input terminal and the rectified current of the phase stabilization and detection circuit 206
Road 203 connects, and the output end that the MCU adjusts circuit 208 is connect with the constant-current drive circuit 205.Exchange input 201 is passed through
Rectification circuit 203 is supplied to after 202 filtering interference signals of EMI filter circuit to be rectified, and is exchanged after 204 pairs of pfc circuit rectifications
Electricity carries out power conversion, a constant DC voltage is exported to constant-current drive circuit 205, constant-current drive circuit 205 passes through function
Rate output 209 directly drives LED lamp.Phase stabilization and detection circuit 206 then carry out the alternating current that rectification circuit 204 exports
Phase-detection.The conduction phase angle signal and cut-off phase angle signal being detected are transferred to MCU adjusting by isolation circuit 207
Circuit 208 is adjusted, and MCU adjusts circuit 208 and exports control signal to constant-current drive circuit 205, achievees the purpose that light modulation.
Referring to figure 3., the EMI filter circuit 202 includes the first inductance LF1 and the second inductance LF2, the first inductance LF1
It is all made of common-mode inductor with the second inductance LF2, the input terminal of the first inductance LF1 is connect with AC input, the first inductance
Between the input terminal of LF1 and it is connected to varistor VDR1, the input terminal of the first inductance LF1 is also connected with safety element F1, insurance
Element F1 can use protective tube or fuse, and the output end of the first inductance LF1 is connect with the input terminal of the second inductance LF2, the
The output end of one inductance LF1 is also connected with RC series filtering circuit, and RC series filtering circuit includes the resistance R1 being cascaded
It is connect with the output end of capacitor CX1, the second inductance LF2 with the rectification circuit, the output end of the second inductance LF2 is also connected with pressure
Quick resistance VDR2 is parallel with resistance R2 and R3 between the input terminal and output end of the second inductance LF2, resistance R2 and R3 are for beating height
Leakage current after discharging and power off when pressure.
The rectification circuit 203 includes rectifier bridge BD1, and the input terminal of rectifier bridge BD1 is connect with the second inductance LF2, defeated
Outlet is connect with the phase stabilization with detection circuit 206.The pfc circuit 204 is using single- stage PFC inverse-excitation type constant pressure isolation electricity
Road, the constant-current drive circuit 205 use DC/DC step-down LED constant-current drive circuit.
The phase stabilization and detection circuit 206 include the first divider resistance 21, the second divider resistance 22, pull down resistor
R7, metal-oxide-semiconductor Q1, zener diode Z1 and triode Q2, first divider resistance 21 include the resistance R8 that is cascaded and
R9, second divider resistance 22 include resistance R4, R5 and the R6 being cascaded, the input terminal of first divider resistance 21
It is connect with the rectification circuit 203, which is node A, the output end and metal-oxide-semiconductor of first divider resistance 21
The drain electrode of Q1 connects, and the source electrode ground connection of metal-oxide-semiconductor Q1, the grid of metal-oxide-semiconductor Q1 is connect by resistance R10 with first voltage end Vcc, institute
The input terminal for stating the second divider resistance 22 is connect with node A, and the output end of second divider resistance 22 is with pull down resistor R7's
One end connection, the connecting node are node B, and the other end of pull down resistor R7 is grounded, and the cathode and node B of zener diode Z1 connects
It connects, the anode of zener diode Z1 is connect with the base stage of triode Q2, the emitter ground connection of triode Q2, the current collection of triode Q2
Pole is connect by resistance R10 with first voltage end Vcc, the output of the current collection of triode Q2 extremely phase stabilization and detection circuit
End, the positive and negative anodes of zener diode Z1 pass through filter capacitor C2 and C1 ground connection respectively.
The isolation circuit 207 includes photoelectrical coupler U1 and diode D1, the diode input terminal of photoelectrical coupler U1
It is connect by resistance R11 with first voltage end Vcc, the diode output of photoelectrical coupler U1 and the anode of diode D1 connect
It connects, the cathode of diode D1 is connect with the collector of triode Q2, the transistor collector and second voltage of photoelectrical coupler U1
Vdd connection is held, the transistor emitter of photoelectrical coupler U1 is grounded by pull down resistor R51, the triode of photoelectrical coupler U1
The output end of transmitting extremely isolation circuit 207.
It includes MCU processor U51, the power pins of MCU processor U51 and second voltage end that the MCU, which adjusts circuit 208,
Vdd connection, and be grounded by filter capacitor C51, the 5th common pin GP4 of MCU processor U51 is input terminal, MCU processor
The 5th common pin GP4 of U51 is connect by π type RC filter network 23 with the transistor emitter of photoelectrical coupler U1, at MCU
Manage device U51 third common pin GP2 be the first output end, the third common pin GP2 by RC parallel filtering circuit with
The constant-current drive circuit connection, the RC parallel filtering circuit include resistance R56 and capacitor C54, resistance R56 and capacitor C54
One end connection, the other end ground connection of capacitor C54, the 6th common pin GP5 of MCU processor U51 is second output terminal, described
6th common pin GP5 is connect by resistance R55 with the constant-current drive circuit 205.
The working principle of the present embodiment is as follows:
Please referring to Fig. 1, Fig. 3 and Fig. 4, it is assumed that the voltage value of node A is Vhv, and the pressure stabilizing value of zener diode Z1 is Vth,
The output electric current of metal-oxide-semiconductor Q1 source electrode is Ihd, then the voltage value of node B is equal to voltage Vhv by point of resistance R4, R5, R6 and R7
Pressure value, if the voltage value of node B is lower than voltage Vth, resistance R8, R9 and metal-oxide-semiconductor Q1 conducting, to maintain the holding of phase dimming
Electric current, the working condition of stable phase angle light modulator, state at this time are phase angle off state, and phase stabilization and detection circuit will
Status signal Vdet is transferred to MCU by isolation circuit and adjusts circuit；If the voltage value of node B be higher than voltage Vth, resistance R8,
R9 and metal-oxide-semiconductor Q1 shutdown, no consumption electric current, it is possible to reduce power loss, state at this time is phase angle on state, and phase is steady
Status signal Vdet is transferred to MCU by isolation circuit and adjusts circuit by fixed and detection circuit.
Status signal Vdet carries out ADC conversion after π type RC filter network filtering interference signals, by MCU processor U51
And two-way PWM dim signal is exported by the first output end and second output terminal respectively, the first output end of MCU processor U51 is defeated
PWM dim signal out generates simulation dim signal after resistance R56 and capacitor C54 filtering, and output to the constant current drives
Circuit 205 realizes the linearity light adjusting between 100% to 10%, the PWM dim signal of MCU processor U51 second output terminal output
It is then directly output to the constant-current drive circuit 205, realizes that the linearity light adjusting between 10% to 1%, the present embodiment use two kinds
1% depth light modulation below may be implemented in light-modulating mode conversion, can solve existing 5% or less light modulator light modulation and shakiness occurs
Fixed problem.
The present embodiment also provides a kind of light adjusting controller, the dimmer switch including shell and setting on the housing,
Above-mentioned dimming driving circuit is provided in the shell.
The present embodiment also provides a kind of LED lamp, including above-mentioned dimming driving circuit and with the dimming driving circuit
The LED light of connection.
The above, only presently preferred embodiments of the present invention, the invention is not limited to above embodiment, as long as
It reaches technical effect of the invention with identical means, all should belong to protection scope of the present invention.In protection model of the invention
Its technical solution and/or embodiment can have a variety of different modifications and variations in enclosing.
Claims (7)
1. a kind of dimming driving circuit, including sequentially connected EMI filter circuit (202), rectification circuit (203), pfc circuit
(204) and constant-current drive circuit (205), it is characterised in that: further include be sequentially connected phase stabilization and detection circuit (206), every
Circuit (208) are adjusted from circuit (207) and MCU, the input terminal and the rectified current of the phase stabilization and detection circuit (206)
Road (203) connection, the output end that the MCU adjusts circuit (208) are connect with the constant-current drive circuit (205).
2. dimming driving circuit as described in claim 1, it is characterised in that: the phase stabilization and detection circuit (206) are wrapped
Include the first divider resistance (21), the second divider resistance (22), pull down resistor R7, metal-oxide-semiconductor Q1, zener diode Z1 and triode
Q2, the input terminal of first divider resistance (21) are connect with the rectification circuit (203), which is node A,
The output end of first divider resistance (21) is connect with the drain electrode of metal-oxide-semiconductor Q1, the source electrode ground connection of metal-oxide-semiconductor, the grid of metal-oxide-semiconductor Q1
It is connect with first voltage end Vcc, the input terminal of second divider resistance (22) is connect with node A, second divider resistance
(22) output end is connect with one end of pull down resistor R7, which is node B, and the other end of pull down resistor R7 is grounded,
The cathode of zener diode Z1 is connect with node B, and the anode of zener diode Z1 is connect with the base stage of triode Q2, triode Q2
Emitter ground connection, the collector of triode Q2 connect with first voltage end Vcc, the current collection of triode Q2 extremely phase stabilization and
The output end of detection circuit (206), the positive and negative anodes of zener diode Z1 pass through filter capacitor C2 and C1 ground connection respectively.
3. dimming driving circuit as described in claim 1, it is characterised in that: the isolation circuit (207) includes photoelectric coupling
The diode input terminal of device U1 and diode D1, photoelectrical coupler U1 are connect by resistance R11 with first voltage end Vcc, photoelectricity
The diode output of coupler U1 is connect with the anode of diode D1, the cathode of diode D1 and the phase stabilization and detection
Circuit (206) connection, the transistor collector of photoelectrical coupler U1 are connect with second voltage end Vdd, and the three of photoelectrical coupler U1
Pole pipe emitter is grounded by pull down resistor R51, the output of the triode emission of photoelectrical coupler U1 extremely isolation circuit (207)
End.
4. dimming driving circuit as described in claim 1, it is characterised in that: it includes at MCU that the MCU, which adjusts circuit (208),
Device U51 is managed, the power pins of MCU processor U51 are connect with second voltage end Vdd, and are grounded by filter capacitor C51, at MCU
The 5th common pin GP4 for managing device U51 is input terminal, and the 5th common pin GP4 of MCU processor U51 filters net by π type RC
Network (23) is connect with the isolation circuit (207), and the third common pin GP2 of MCU processor U51 is the first output end, described
Third common pin GP2 is connect by RC parallel filtering circuit with the constant-current drive circuit (205), and the of MCU processor U51
Six common pin GP5 are second output terminal, and the 6th common pin GP5 passes through resistance R55 and the constant-current drive circuit
(205) it connects.
5. dimming driving circuit as described in claim 1, it is characterised in that: the EMI filter circuit (202) includes the first electricity
Sense LF1 and the second inductance LF2, the input terminal of the first inductance LF1 are connect with AC input, the input terminal of the first inductance LF1
It is also connected with varistor VDR1 and safety element F1, the input terminal company of the output end of the first inductance LF1 and the second inductance LF2
It connects, the output end of the first inductance LF1 is also connected with RC series filtering circuit, the output end of the second inductance LF2 and the rectified current
Road (203) connection, the output end of the second inductance LF2 are also connected with varistor VDR2, the input terminal of the second inductance LF2 and output
Resistance R2 and R3 are parallel between end.
6. a kind of light adjusting controller, it is characterised in that: including the dimmer switch of shell and setting on the housing, the shell
It is arranged in vivo just like dimming driving circuit described in claim 1-5 any one.
7. a kind of LED lamp, it is characterised in that: including as described in claim 1-5 any one dimming driving circuit and
The LED light being connect with the dimming driving circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811219243.9A CN109379806B (en) | 2018-10-19 | 2018-10-19 | Dimming drive circuit, dimming controller and LED lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811219243.9A CN109379806B (en) | 2018-10-19 | 2018-10-19 | Dimming drive circuit, dimming controller and LED lamp |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109379806A true CN109379806A (en) | 2019-02-22 |
| CN109379806B CN109379806B (en) | 2021-01-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811219243.9A Expired - Fee Related CN109379806B (en) | 2018-10-19 | 2018-10-19 | Dimming drive circuit, dimming controller and LED lamp |
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| Country | Link |
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| CN (1) | CN109379806B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109922566A (en) * | 2019-03-04 | 2019-06-21 | 深圳民爆光电技术有限公司 | Intelligent dimming LED drive device and LED light control system |
| CN111182672A (en) * | 2020-01-16 | 2020-05-19 | 深圳市英可瑞直流技术有限公司 | Illumination control method |
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| CN203661349U (en) * | 2013-11-19 | 2014-06-18 | 无锡安特源科技有限公司 | LED power source platform capable of realizing fusion of various light modulation modes |
| CN205092997U (en) * | 2015-09-01 | 2016-03-16 | 惠州市欢腾智能科技有限公司 | High -power dimming controller |
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| CN108650748A (en) * | 2018-07-10 | 2018-10-12 | 无锡安特源科技股份有限公司 | A kind of constant pressure dimming power source device being compatible with a variety of dimming modes |
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| CN101835317A (en) * | 2010-05-28 | 2010-09-15 | 电子科技大学 | Fly-back street lamp illumination LED constant-current driving power supply with intelligent dimming function |
| CN103369802A (en) * | 2013-08-02 | 2013-10-23 | 叶鸣 | Design method of LED (light-emitting diode) dimming driving switching power supply applied to various traditional dimmers |
| CN203661349U (en) * | 2013-11-19 | 2014-06-18 | 无锡安特源科技有限公司 | LED power source platform capable of realizing fusion of various light modulation modes |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109922566A (en) * | 2019-03-04 | 2019-06-21 | 深圳民爆光电技术有限公司 | Intelligent dimming LED drive device and LED light control system |
| CN109922566B (en) * | 2019-03-04 | 2024-01-12 | 深圳民爆光电股份有限公司 | Intelligent dimming LED driving device and LED lamp control system |
| CN111182672A (en) * | 2020-01-16 | 2020-05-19 | 深圳市英可瑞直流技术有限公司 | Illumination control method |
| CN111182672B (en) * | 2020-01-16 | 2021-06-29 | 深圳市英可瑞直流技术有限公司 | Illumination control method |
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| Publication number | Publication date |
|---|---|
| CN109379806B (en) | 2021-01-05 |
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