CN209517575U - A kind of switching power circuit of LED illumination device - Google Patents
A kind of switching power circuit of LED illumination device Download PDFInfo
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- CN209517575U CN209517575U CN201821973060.1U CN201821973060U CN209517575U CN 209517575 U CN209517575 U CN 209517575U CN 201821973060 U CN201821973060 U CN 201821973060U CN 209517575 U CN209517575 U CN 209517575U
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- 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]
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Abstract
The utility model discloses a kind of switching power circuits of LED illumination device, which is characterized in that including power supply input circuit, the first current rectifying and wave filtering circuit, power switch circuit, voltage regulator circuit, transformer, output circuit；The input terminal of the output end of the power supply input circuit and the first current rectifying and wave filtering circuit is electrically connected, the output end of first current rectifying and wave filtering circuit and the input terminal of voltage regulator circuit are electrically connected, the output end of the voltage regulator circuit and the input terminal of transformer are electrically connected, the output end of the transformer and the input terminal of output circuit are electrically connected, and the output end of the output circuit gives voltage output to junior's circuit；The output end port electric connection corresponding with power switch circuit respectively of the power supply input circuit, the first current rectifying and wave filtering circuit, voltage regulator circuit, transformer, output circuit；The utility model has the advantages that strong interference immunity, the operation is stable, energy conservation and environmental protection, easy-maintaining.
Description
Technical field
The utility model belongs to switch power technology field, and in particular to a kind of switching power circuit of LED illumination device.
Background technique
Intensification with people to awareness of saving energy with the development of science and technology, for energy-saving and environmental protection, long service life
And luminous efficiency it is high the advantages that LED illumination device, it is more universal with getting up in daily life, and LED illumination device
Switching Power Supply occupies very important status in LED technology field as the energy source of LED illumination device；LED illumination device
Switching Power Supply directly determine the functional performance and service life of equipment, there are anti-interferences in existing LED illumination device
Poor, job insecurity, disadvantage not easy to repair.
Utility model content
The utility model is directed to above-described deficiency, provides a kind of strong interference immunity, the operation is stable, energy conservation and environmental protection, easily
The switching power circuit of the LED illumination device of maintenance.
To achieve the above object, the utility model provides the following technical solutions: a kind of switch power supply of LED illumination device
Road, including power supply input circuit；Transformer；First current rectifying and wave filtering circuit, the input terminal and electricity of first current rectifying and wave filtering circuit
The output end of source input circuit connects, and the output end of first current rectifying and wave filtering circuit connects junior's circuit；
Voltage regulator circuit, the input terminal of the voltage regulator circuit connects the output end connection of the first current rectifying and wave filtering circuit, described steady
The output end of volt circuit and the primary coil of transformer connect；
Power switch circuit, the power switch circuit include MCU control module, the first feed circuit, first switch electricity
Road, current detection circuit, second switch circuit；First feed circuit output end connection corresponding with voltage regulator circuit, and the
Signal on voltage regulator circuit is fed back to corresponding first feedback signal input terminal of MCU control module, the MCU by one feed circuit
After control module handles feedback signal, output end output signal adjusts voltage on voltage regulator circuit through second switch circuit；The electricity
Current detection circuit connects the input terminal of voltage regulator circuit, and current detection circuit is burst the current signal on voltage regulator circuit is counter to MCU
The current signal test side of control module, after the MCU control module detects electric current, output signal is through first after inter-process
Switching circuit adjusts the electric current on voltage regulator circuit；
Output circuit, the secondary coil of the output circuit connection transformer, and give voltage output to junior's circuit.
Preferably, the power switch circuit further includes compensation circuit, the second feed circuit；Second feed circuit connects
The corresponding output end of output circuit, the voltage signal on the second feed circuit acquisition output circuit are connect, and feeds back to MCU control
Corresponding second feedback signal input terminal of molding block, after the MCU control module receives the second feedback signal, and output signal passes through
Second switch circuit adjusts the voltage on voltage regulator circuit；The connection of the primary coil of the compensation circuit input terminal and transformer, institute
State the input terminal connection corresponding with MCU control module of compensation circuit output end.
Preferably, the MCU control module is set as FAN6921MR power supply control chip and its control of FAN6921MR power supply
Chip periphery circuit.
Preferably, the transformer is set as high frequency transformer；At the beginning of the high frequency transformer includes the first primary coil, second
Grade coil, the first secondary coil；The compensation circuit includes capacitor C12, resistance R30, diode D10；The capacitor C12, electricity
Resistance R30, diode D10 are connected in parallel, and the common end after parallel connection is connect with second primary coil one end, another common end and
10th pin of FAN6921MR power supply control chip connects；The other end of second primary coil connects FAN6921MR power supply
Control the 7th pin of chip.
Preferably, the voltage regulator circuit is set as RCD clamp circuit；The RCD clamp circuit connects the first primary coil
Both ends.
Preferably, first feed circuit includes resistance R9, resistance R10；One end of the resistance R9 and RCD clamper electricity
The input terminal on road connects, and the resistance R9 other end is connect through resistance R10 with the 3rd pin of FAN6921MR power supply control chip.
Preferably, the first switch circuit include field-effect tube Q1, resistance R5, resistance R8, resistance R13, resistance R14,
Resistance R17, diode D1, diode D6；Input terminal of the drain electrode of the field-effect tube Q1 through diode D1 Yu RCD clamp circuit
Connection, the source electrode of the field-effect tube Q1 are grounded through resistance R14, and the source electrode of the field-effect tube Q1 is imitated through resistance R13 and field
Should pipe Q1 grid connection；The grid of the field-effect tube Q1 is connect through resistance R8 with the emitter of triode Q3, three pole
The collector of pipe Q3 is connect through resistance R17 with the 4th pin of FAN6921MR power supply control chip, and the collection of the triode Q3
Electrode is grounded through resistance R14, and the base stage of the triode Q3 is connect with the 6th pin of FAN6921MR power supply control chip；It is described
Diode D6 and resistance R5 is connected in series, and the one end diode D6 is connect with triode Q3 base stage, the one end the resistance R5 and field
The connection of effect pipe Q1 grid.
Preferably, the current detection circuit includes double winding inductance T1, diode D7；The double winding inductance T1 is wherein
One winding both ends are connect through diode D7, diode D1 with the input terminal of RCD clamp circuit respectively；The double winding inductance T1 is another
Outer winding one end ground connection, the other end are connect with the 14th pin of FAN6921MR power supply control chip.
Preferably, the second switch circuit includes field-effect tube Q2, diode D8, resistance R20, resistance R21, resistance
R26；The drain electrode of the field-effect tube Q2 is connect with one end of the first primary coil, and the source electrode of the field-effect tube Q2 is through resistance
R20 ground connection, the grid of the field-effect tube Q2 control core with corresponding FAN6921MR power supply respectively through resistance R21, resistance R26
The 5th pin connection of the 8th pin, FAN6921MR power supply control chip of piece；The diode D8 is connected in parallel on the both ends resistance R21.
Preferably, second feed circuit includes receiving optocoupler U1-B, transmitting optocoupler U1-A, resistance R23；The reception
The one end optocoupler U1-B ground connection, the other end are connect through resistance R23 with the 11st pin of FAN6921MR power supply control chip；The hair
The output end for penetrating optocoupler U1-A and output circuit connects.
The utility model compared with prior art, has the advantages that
The utility model carries out overcurrent-overvoltage overheat protector by power supply input circuit, to power supply, prevent common mode interference and
DM EMI, improves the interference free performance of Switching Power Supply, further improves the stability of circuit work；Power switch circuit
Using integrated chip, Switching Power Supply the space occupied is reduced, also facilitates and circuit is overhauled；Power switch circuit passes through the
The signal that one feed circuit, the second feed circuit, current detection circuit provide, to control first switch circuit, second switch
Circuit work, stable power supply is provided to junior's circuit, improves power circuit to the transfer efficiency of electric energy, more energy-saving ring
It protects.Therefore the utility model has strong interference immunity, the operation is stable, energy conservation and environmental protection, easy-maintaining beneficial effect.
Detailed description of the invention
Fig. 1 is the frame principle figure of the utility model；
Fig. 2 is the circuit diagram of the output circuit of the utility model, the second feed circuit；
Fig. 3 be the power supply input circuit of the utility model, the first current rectifying and wave filtering circuit, power switch circuit, voltage regulator circuit,
The circuit diagram of transformer.
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work
Every other embodiment obtained, fall within the protection scope of the utility model.
Shown in please referring to Fig.1 to Fig.3, the utility model is provided the following technical solutions: a kind of switch electricity of LED illumination device
Source circuit, including power supply input circuit 1；Transformer 5；First current rectifying and wave filtering circuit 2, first current rectifying and wave filtering circuit 2 it is defeated
Enter end to connect with the output end of power supply input circuit 1,2 output end of the first current rectifying and wave filtering circuit connects junior's circuit；
Voltage regulator circuit 4, the input terminal of the voltage regulator circuit 4 connects the output end connection of the first current rectifying and wave filtering circuit 2, described
The output end of voltage regulator circuit 4 is connect with the primary coil of transformer 5；
Power switch circuit 3, the power switch circuit 3 include MCU control module 31, the first feed circuit 32, first
Switching circuit 34, current detection circuit 35, second switch circuit 36；First feed circuit 32 is corresponding with voltage regulator circuit 4
Output end is electrically connected, and the signal of voltage regulator circuit 32 is fed back to MCU control module 31 corresponding the by the first feed circuit 32
One feedback signal input terminal, after the MCU control module 31 handles feedback signal, output end output signal is through second switch circuit
34 adjust the voltage on voltage regulator circuit 4；The current detection circuit 35 connects the input terminal of voltage regulator circuit 4, and current detecting electricity
Current signal on voltage regulator circuit 4 is fed back to the current signal test side of MCU control module 31 by road 35, and the MCU controls mould
After block 31 detects electric current, output signal control first switch circuit 36 adjusts the electric current on voltage regulator circuit 4 after inter-process；
Output circuit 6, the output circuit 6 connect the secondary coil of transformer 5, and give voltage output to junior's circuit.
The power switch circuit 3 further includes compensation circuit 37, the second feed circuit 38；Second feed circuit 38 connects
The corresponding output end of output circuit 6 is connect, second feed circuit 38 acquires the voltage signal on output circuit 6, and feeds back to
Corresponding second feedback signal input terminal of MCU control module 31, after the MCU control module 31 receives the second feedback signal, and
Output signal adjusts the voltage on voltage regulator circuit 4 through second switch circuit 34；37 input terminal of compensation circuit and transformer 5
Primary coil connection, 37 output end of compensation circuit input terminal corresponding with MCU control module 31 connect.
The MCU control module 31 is set as outside FAN6921MR power supply control chip and its FAN6921MR power supply control chip
Enclose circuit.
The transformer 5 is set as high frequency transformer；The high frequency transformer includes the first primary coil, the second primary line
Circle, the first secondary coil；The compensation circuit 37 includes capacitor C12, resistance R30, diode D10；The capacitor C12, resistance
R30, diode D10 are connected in parallel, and the common end after parallel connection is connect with second primary coil one end, another common end with
10th pin of FAN6921MR power supply control chip connects；The other end of second primary coil connects FAN6921MR power supply
Control the 7th pin of chip.
The voltage regulator circuit 4 is set as RCD clamp circuit；The RCD clamp circuit connects the both ends of the first primary coil.
First feed circuit 32 includes resistance R9, resistance R10；One end of the resistance R9 and RCD clamp circuit
Input terminal connection, the resistance R9 other end are connect through resistance R10 with the 3rd pin of FAN6921MR power supply control chip.
The first switch circuit 36 includes field-effect tube Q1, resistance R5, resistance R8, resistance R13, resistance R14, resistance
R17, diode D1, diode D6；The drain electrode of the field-effect tube Q1 connects through the input terminal of diode D1 and RCD clamp circuit
It connects, the source electrode of the field-effect tube Q1 is grounded through resistance R14, and the source electrode of the field-effect tube Q1 is through resistance R13 and field-effect
The grid of pipe Q1 connects；The grid of the field-effect tube Q1 is connect through resistance R8 with the emitter of triode Q3, the triode
The collector of Q3 is connect through resistance R17 with the 4th pin of FAN6921MR power supply control chip, and the current collection of the triode Q3
Pole is grounded through resistance R14, and the base stage of the triode Q3 is connect with the 6th pin of FAN6921MR power supply control chip；Described two
Pole pipe D6 and resistance R5 is connected in series, and the one end diode D6 is connect with triode Q3 base stage, and the one end the resistance R5 and field are imitated
It should the connection of pipe Q1 grid.
The current detection circuit 35 includes double winding inductance T1, diode D7；The double winding inductance T1 wherein one around
Group both ends are connect through diode D7, diode D1 with the input terminal of RCD clamp circuit respectively；The double winding inductance T1 other one
Winding one end ground connection, the other end are connect with the 14th pin of FAN6921MR power supply control chip.
The second switch circuit 34 includes field-effect tube Q2, diode D8, resistance R20, resistance R21, resistance R26；Institute
The drain electrode for stating field-effect tube Q2 is connect with one end of the first primary coil, and the source electrode of the field-effect tube Q2 is grounded through resistance R20,
The grid of the field-effect tube Q2 respectively through resistance R21, resistance R26, with corresponding FAN6921MR power supply control chip the 8th
The 5th pin connection of pin, FAN6921MR power supply control chip；The diode D8 is connected in parallel on the both ends resistance R21.
Second feed circuit 38 includes receiving optocoupler U1-B, transmitting optocoupler U1-A, resistance R23；The reception optocoupler
The one end U1-B ground connection, other end are connect through resistance R23 with the 11st pin of FAN6921MR power supply control chip；The transmitting
Optocoupler U1-A is connect with the output end of output circuit 6.
Embodiment 1:
The power switch circuit 3 further includes start-up circuit 33；The start-up circuit 33 includes diode D4, diode
D5, resistance R3, resistance R4, resistance R6, resistance R7；One end of the diode D4 and diode D5 is separately connected power input electricity
After the other end of the output end on road, the diode D4 and diode D5 interconnect, respectively through resistance R3, resistance R4 and resistance
The 13rd pin company of 16th pin of R6, resistance R7 and FAN6921MR power supply control chip, FAN6921MR power supply control chip
It connects.
Embodiment 2:
The power supply input circuit 1 is set as EMI filter circuit；The EMI filter circuit includes protective tube F1, varistor
MOV1, common mode inductance LF1, common mode inductance LF2, capacitor CY1, capacitor CY2, capacitor CX1, resistance R1, resistance R2, thermistor
NTC1；The input terminal of one end connection power supply input circuit 1 of the protective tube, the other end of protective tube F1 connect varistor
One end of MOV1；The both ends of the varistor MOV1 are separately connected two input terminals of common mode inductance LF2, the common mode inductance
Two output ends of LF2 are separately connected two input terminals at the both ends of capacitor CX1, common mode inductance LF1；The capacitor CY1, capacitor
CY2 is connected in parallel after being connected in series with capacitor CX1, and the resistance R1, resistance R2 are connected in parallel after being connected in series with capacitor CX1；
An output end of one end connection common mode inductance LF1 of the thermistor NTC1, the other end connection the of thermistor NTC1
The input terminal of one current rectifying and wave filtering circuit 2.
Embodiment 3:
Working principle of the utility model is:
Power supply passes through power supply input circuit 1, and power supply input circuit 1 carries out overcurrent-overvoltage overheat protector to power supply, eliminates and do
After disturbing signal, a part is sent into the first current rectifying and wave filtering circuit 2, and the activated circuit 33 of another part starts MCU module 31 and works；Through
First current rectifying and wave filtering circuit 2 carries out the power supply feeding voltage regulator circuit 4 after rectifying and wave-filtering, after voltage regulator circuit 4 carries out pressure stabilizing to power supply
It is sent into the first primary coil of transformer 4, the power supply that first grade coil electromagnetism induction generates is given after the processing of output circuit 6
The power supply of junior's circuit；
Voltage signal on voltage regulator circuit 4 is fed back to MCU module 31 by the first feed circuit 32, and MCU module 31 is according to
The voltage signal of one feed circuit 32 feedback, controls the working condition of second switch circuit 36；Current detection circuit 35 is by pressure stabilizing
Current signal on circuit 4 is transferred to MCU module 31, the current signal that MCU module 31 is detected according to current detection circuit 35, control
The working condition of first switch circuit 34 processed, to realize stable power output；
The voltage signal that output circuit 6 exports is fed back to MCU module 31,31 basis of MCU module by the second feed circuit 38
The voltage signal of second feed circuit 38 feedback, controls the working condition of second switch circuit 36, to provide to output circuit 6
Stable voltage output；
Compensation circuit 37 compensates the working loss of second switch circuit 36, to improve the work effect of circuit
Rate.
While there has been shown and described that the embodiments of the present invention, for the ordinary skill in the art,
It is understood that these embodiments can be carried out with a variety of variations in the case where not departing from the principles of the present invention and spirit, repaired
Change, replacement and variant, the scope of the utility model is defined by the appended claims and the equivalents thereof.
Claims (10)
1. a kind of switching power circuit of LED illumination device, which is characterized in that including power supply input circuit；Transformer；First is whole
Filter circuit is flowed, the input terminal of first current rectifying and wave filtering circuit and the output end of power supply input circuit connect, and described first is whole
The output end for flowing filter circuit connects junior's circuit；
Voltage regulator circuit, the input terminal of the voltage regulator circuit connect the output end connection of the first current rectifying and wave filtering circuit, the pressure stabilizing electricity
The output end on road and the primary coil of transformer connect；
Power switch circuit, the power switch circuit include MCU control module, the first feed circuit, first switch circuit, electricity
Current detection circuit, second switch circuit；First feed circuit output end connection corresponding with voltage regulator circuit, and the first feedback
Signal on voltage regulator circuit is fed back to corresponding first feedback signal input terminal of MCU control module by circuit, and the MCU controls mould
After block handles feedback signal, output end output signal adjusts voltage on voltage regulator circuit through second switch circuit；The current detecting
The input terminal of circuit connection voltage regulator circuit, and counter burst of the current signal on voltage regulator circuit is controlled mould to MCU by current detection circuit
The current signal test side of block, after the MCU control module detects electric current, output signal is through first switch electricity after inter-process
Road adjusts the electric current on voltage regulator circuit；
Output circuit, the secondary coil of the output circuit connection transformer, and give voltage output to junior's circuit.
2. the switching power circuit of LED illumination device according to claim 1, it is characterised in that: the power switch electricity
Road further includes compensation circuit, the second feed circuit；The corresponding output end of second feed circuit connection output circuit, described the
Two feed circuits acquire the voltage signal on output circuit, and feed back to the corresponding second feedback signal input of MCU control module
End, after the MCU control module receives the second feedback signal, and output signal is adjusted on voltage regulator circuit through second switch circuit
Voltage；The connection of the primary coil of the compensation circuit input terminal and transformer, the compensation circuit output end and MCU control module
Corresponding input terminal connection.
3. the switching power circuit of LED illumination device according to claim 2, it is characterised in that: the MCU control module
It is set as FAN6921MR power supply control chip and its FAN6921MR power supply control chip peripheral circuit.
4. the switching power circuit of LED illumination device according to claim 3, it is characterised in that: the transformer is set as
High frequency transformer；The high frequency transformer includes the first primary coil, the second primary coil, the first secondary coil；The compensation
Circuit includes capacitor C12, resistance R30, diode D10；The capacitor C12, resistance R30, diode D10 are connected in parallel, and simultaneously
A common end after connection is connect with second primary coil one end, another common end and the 10th of FAN6921MR power supply control chip
Pin connection；7th pin of the other end connection FAN6921MR power supply control chip of second primary coil.
5. the switching power circuit of LED illumination device according to claim 4, it is characterised in that: the voltage regulator circuit is set
For RCD clamp circuit；The RCD clamp circuit connects the both ends of the first primary coil.
6. the switching power circuit of LED illumination device according to claim 5, it is characterised in that: the first feedback electricity
Road includes resistance R9, resistance R10；One end of the resistance R9 is connect with the input terminal of RCD clamp circuit, and the resistance R9 is another
End is connect through resistance R10 with the 3rd pin of FAN6921MR power supply control chip.
7. the switching power circuit of LED illumination device according to claim 6, it is characterised in that: the first switch electricity
Road includes field-effect tube Q1, resistance R5, resistance R8, resistance R13, resistance R14, resistance R17, diode D1, diode D6；It is described
The drain electrode of field-effect tube Q1 is connect through diode D1 with the input terminal of RCD clamp circuit, and the source electrode of the field-effect tube Q1 is through electricity
R14 ground connection is hindered, and the source electrode of the field-effect tube Q1 is connect through resistance R13 with the grid of field-effect tube Q1；The field-effect tube
The grid of Q1 is connect through resistance R8 with the emitter of triode Q3, the collector of the triode Q3 through resistance R17 with
4th pin of FAN6921MR power supply control chip connects, and the collector of the triode Q3 is grounded through resistance R14, and described three
The base stage of pole pipe Q3 is connect with the 6th pin of FAN6921MR power supply control chip；The diode D6 connects company with resistance R5
It connects, and the one end diode D6 is connect with triode Q3 base stage, the one end the resistance R5 is connect with field-effect tube Q1 grid.
8. the switching power circuit of LED illumination device according to claim 7, it is characterised in that: the current detecting electricity
Road includes double winding inductance T1, diode D7；The double winding inductance T1 wherein a winding both ends respectively through diode D7, two poles
Pipe D1 is connect with the input terminal of RCD clamp circuit；The other winding one end the double winding inductance T1 ground connection, the other end with
14th pin of FAN6921MR power supply control chip connects.
9. the switching power circuit of LED illumination device according to claim 8, it is characterised in that: the second switch electricity
Road includes field-effect tube Q2, diode D8, resistance R20, resistance R21, resistance R26；The drain electrode and first of the field-effect tube Q2
One end of primary coil connects, and the source electrode of the field-effect tube Q2 is grounded through resistance R20, the grid difference of the field-effect tube Q2
Through resistance R21, resistance R26, core is controlled with the 8th pin of corresponding FAN6921MR power supply control chip, FAN6921MR power supply
5th pin of piece connects；The diode D8 is connected in parallel on the both ends resistance R21.
10. the switching power circuit of LED illumination device according to claim 9, it is characterised in that: the second feedback electricity
Road includes receiving optocoupler U1-B, transmitting optocoupler U1-A, resistance R23；Reception one end optocoupler U1-B ground connection, the other end is through resistance
R23 is connect with the 11st pin of FAN6921MR power supply control chip；The output end of the transmitting optocoupler U1-A and output circuit connects
It connects.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821973060.1U CN209517575U (en) | 2018-11-28 | 2018-11-28 | A kind of switching power circuit of LED illumination device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821973060.1U CN209517575U (en) | 2018-11-28 | 2018-11-28 | A kind of switching power circuit of LED illumination device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209517575U true CN209517575U (en) | 2019-10-18 |
Family
ID=68190998
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821973060.1U Active CN209517575U (en) | 2018-11-28 | 2018-11-28 | A kind of switching power circuit of LED illumination device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209517575U (en) |
-
2018
- 2018-11-28 CN CN201821973060.1U patent/CN209517575U/en active Active
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