CN209592973U - PMOS tube protects circuit - Google Patents
PMOS tube protects circuit Download PDFInfo
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- CN209592973U CN209592973U CN201920152818.3U CN201920152818U CN209592973U CN 209592973 U CN209592973 U CN 209592973U CN 201920152818 U CN201920152818 U CN 201920152818U CN 209592973 U CN209592973 U CN 209592973U
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- 239000004065 semiconductor Substances 0.000 claims abstract description 67
- 238000005070 sampling Methods 0.000 claims abstract description 7
- 239000003990 capacitor Substances 0.000 claims description 13
- 230000005611 electricity Effects 0.000 claims description 4
- 230000008878 coupling Effects 0.000 claims description 2
- 238000010168 coupling process Methods 0.000 claims description 2
- 238000005859 coupling reaction Methods 0.000 claims description 2
- 230000002159 abnormal effect Effects 0.000 abstract description 6
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000005856 abnormality Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 241000208340 Araliaceae Species 0.000 description 1
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 description 1
- 235000003140 Panax quinquefolius Nutrition 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 235000008434 ginseng Nutrition 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 229910000679 solder Inorganic materials 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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Abstract
The utility model discloses a kind of PMOS tube protection circuit; including partial pressure unit, with reference to comparing unit, switch control module and metal-oxide-semiconductor output module; the sampling end of the partial pressure unit is electrically connected with the output end of the metal-oxide-semiconductor output module; the output end of the partial pressure unit is electrically connected with the input terminal with reference to comparing unit; the output end with reference to comparing unit is electrically connected with the input terminal of the switch control module, and the output end of the switch control module is electrically connected with the control terminal of the metal-oxide-semiconductor output module.The utility model is that a kind of PMOS tube protects circuit; when there is output end voltage exception; it then can control the shutdown output of metal-oxide-semiconductor output module; protect metal-oxide-semiconductor not by the damage of high temperature; protect the safe handling of entire circuit; by limiting the temperature rise of pipe in controllable range, thus avoid pipe stablize occur it is abnormal increase, can also avoid the occurrence of and burn out metal-oxide-semiconductor and circuit board risk on fire occur.
Description
Technical field
The utility model relates to power protecting circuit fields, protect circuit more particularly to a kind of PMOS tube.
Background technique
The effect of TV power supply circuit is that alternating voltage is carried out transformation (decompression), and then rectified, filtering, pressure stabilizing obtain
Each section circuit is supplied to satisfactory stable DC voltage.The liquid crystal TV set produced at present all uses integrated circuit control
System.Integrated circuit television machine has the advantages that following: 1, an integrated circuit, includes thousands of a electronic components, can replace
One or several element circuits make to install to greatly reduce the component population of complete machine, and debugging process greatly simplifies, and improve
Production efficiency.2, since the reduction of component number, the solder joint number and connecting wire of whole set of television also greatly reduce, production is improved
The reliability of product.3, integrated circuit has been generally used most perfect circuit in the design, and therefore TV box improves TV whole
The performance indicator of machine.Due to being influenced by manufacturing process, can only be integrated in integrated circuit the transistor of middle low power, resistance and
The capacitor (several hundred PF or less) of low capacity；The components such as inductance, the capacitor of larger capacity, resistance and high power transistor are general to go back
It is to need using the external discrete component of TV.
In a power, it generally can be all provided with PMOS tube, for controlling the output of power supply.And when PMOS tube is in exception
Under state, i.e., tube interior leads to the pole G and the extremely short road D because of certain reason, and the pressure drop on pipe is very big, and it is different to will lead to pipe temperature rise
It often increases, scolding tin can be caused to melt away or even the risks such as on fire if serious.
Utility model content
The purpose of the utility model is to overcome shortcoming in the prior art, a kind of temperature rise for limiting pipe is provided can
In the range of control, avoiding pipe from stablizing, appearance is abnormal to be increased, avoids the occurrence of the PMOS for burning out metal-oxide-semiconductor and avoiding the occurrence of risk on fire
Tube protective circuit.
The purpose of this utility model is achieved through the following technical solutions:
A kind of PMOS tube protection circuit, comprising: partial pressure unit is exported with reference to comparing unit, switch control module and metal-oxide-semiconductor
Module, the sampling end of the partial pressure unit are electrically connected with the output end of the metal-oxide-semiconductor output module, the output of the partial pressure unit
End is electrically connected with the input terminal with reference to comparing unit, the output end with reference to comparing unit and the switch control module
Input terminal electrical connection, the output end of the switch control module is electrically connected with the control terminal of the metal-oxide-semiconductor output module.
The switch control module includes switch control unit and optocoupler unit in one of the embodiments, described to open
Close control unit control terminal be electrically connected with the output end with reference to comparing unit, the output end of the switch control unit and
The optocoupler unit electrical connection.
The switch control unit includes resistance R144, zener diode ZD1 and triode in one of the embodiments,
Q110, one end of the resistance R144 are electrically connected with the output end of the metal-oxide-semiconductor output module, the other end of the resistance R144
It is electrically connected with the cathode of the zener diode ZD1, the base stage of the anode of the zener diode ZD1 and the triode Q110
Electrical connection, the collector of the triode Q110 are electrically connected with the optocoupler unit, the emitter ground connection of the triode Q110.
The optocoupler unit includes photoelectrical coupler, resistance R143 and resistance R129 in one of the embodiments, described
The anode of the light emitting diode of photoelectrical coupler is electrically connected with one end of the resistance R143, and luminous the two of the photoelectrical coupler
The cathode of pole pipe is electrically connected with the output end of the switch control unit, and the other end and the metal-oxide-semiconductor of the resistance R143 is defeated
One end electrical connection of the output end electrical connection of module out, the collector of the photoelectrical coupler and the resistance R129, the electricity
The other end of resistance R129 is for connecting feeder ear VCC, the control of the emitter of the photoelectrical coupler and the metal-oxide-semiconductor output module
End electrical connection processed.
The partial pressure unit includes resistance R135 and resistance R146 in one of the embodiments, the resistance R146's
First end is electrically connected with the output end of the metal-oxide-semiconductor output module, and the second end of the resistance R146 is with the resistance R135's
One end electrical connection, the other end ground connection of the resistance R135.
The reference comparing unit includes three-terminal voltage-stabilizing pipe U105, the three-terminal voltage-stabilizing pipe in one of the embodiments,
The reference end of U105 is electrically connected with the second end of the resistance R146, and the cathode and the switch of the three-terminal voltage-stabilizing pipe U105 is controlled
The input terminal of molding block is electrically connected, the plus earth of the three-terminal voltage-stabilizing pipe U105.
The metal-oxide-semiconductor output module includes switching output unit and control unit in one of the embodiments, described to open
The input terminal for closing output unit is electrically connected with the control unit, the output end of the switch output unit and the partial pressure unit
Sampling end electrical connection, the control terminal of described control unit is electrically connected with the output end of the switch control module.
The switch output unit includes capacitor C14, capacitor C15, resistance R33 and metal-oxide-semiconductor in one of the embodiments,
Q2, the both ends of the capacitor C15 are electrically connected with the pole G of the metal-oxide-semiconductor Q2 and the pole S respectively, the both ends of the resistance R33 respectively with
The pole G of the metal-oxide-semiconductor Q2 and the electrical connection of the pole S, the both ends of the capacitor C14 are electrically connected with the pole G of the metal-oxide-semiconductor Q2 and the pole D respectively
Connect, and the pole S of the metal-oxide-semiconductor Q2 is also electrically connected with the control unit, the pole D of the metal-oxide-semiconductor Q2 also with the partial pressure unit
Input terminal electrical connection.
Described control unit includes main control chip U1 and resistance R28, the main control chip U1 in one of the embodiments,
CS pin be electrically connected with one end of the resistance R28, the emitter of the other end of the resistance R28 and the photoelectrical coupler
Electrical connection.
The main control chip U1 uses the chip of model OB5269CPA in one of the embodiments,.
The utility model compared with the prior art the advantages of and have the beneficial effect that:
The utility model is that a kind of PMOS tube protects circuit, can sample output end metal-oxide-semiconductor by the way that partial pressure unit is arranged
Output voltage, and after comparing by reference to comparing unit the voltage of output end, it outputs voltage signal in switch control module,
So as to output control signals to metal-oxide-semiconductor output module, control metal-oxide-semiconductor whether output voltage；It is different when there is output end voltage
When normal, then it can control the shutdown output of metal-oxide-semiconductor output module, metal-oxide-semiconductor protected by the damage of high temperature, not protect entire circuit
Safe handling, by limiting the temperature rise of pipe in controllable range, thus avoid pipe stablize occur it is abnormal increase, may be used also
To avoid there is burning out metal-oxide-semiconductor and circuit board risk on fire occur.
Detailed description of the invention
It, below will be to use required in embodiment in order to illustrate more clearly of the technical solution of the utility model embodiment
Attached drawing be briefly described, it should be understood that the following drawings illustrates only some embodiments of the utility model, therefore should not be by
Regard the restriction to range as, for those of ordinary skill in the art, without creative efforts, may be used also
To obtain other relevant attached drawings according to these attached drawings.
Fig. 1 is that the PMOS tube of one embodiment of the utility model protects the functional block diagram of circuit；
Fig. 2 is that the PMOS tube of one embodiment of the utility model protects the circuit diagram of circuit.
Specific embodiment
The utility model is more fully retouched below with reference to relevant drawings for the ease of understanding the utility model,
It states.The better embodiment of the utility model is given in attached drawing.But the utility model can come in many different forms
It realizes, however it is not limited to embodiments described herein.On the contrary, the purpose of providing these embodiments is that making practical new to this
The disclosure of type understands more thorough and comprehensive.
It should be noted that it can directly on the other element when element is referred to as " being fixed on " another element
Or there may also be elements placed in the middle.When an element is considered as " connection " another element, it, which can be, is directly connected to
To another element or it may be simultaneously present centering elements.Term as used herein " vertical ", " horizontal ", " left side ",
" right side " and similar statement for illustrative purposes only, are not meant to be the only embodiment.
Unless otherwise defined, all technical and scientific terms used herein are led with the technology for belonging to the utility model
The normally understood meaning of the technical staff in domain is identical.Terminology used in the description of the utility model herein only be
The purpose of description specific embodiment, it is not intended that in limitation the utility model.Term " and or " used herein packet
Include any and all combinations of one or more related listed items.
Semiconductor element inevitably will appear various abnormal conditions in use process due to prolonged aging, than
Such as short circuit, open circuit etc..Use for current TV set power, the pole G and the extremely short road D inside the PMOS appearance of output end
When, will lead to that pipe pressure drop itself is very big, generate many power consumptions, pipe temperaturing lifting abnormality increases, it is serious can generate heat it is different
Often, make hot-spot, cause danger on fire.This protection circuit is to solve under above-mentioned abnormality, and pipe temperature rise is not
It can increase extremely, avoid potential hidden danger.
In one embodiment, referring to Fig. 1, a kind of PMOS tube protects circuit, comprising: partial pressure unit 100, with reference to relatively single
Member 200, switch control module 300 and metal-oxide-semiconductor output module 400, the sampling end of the partial pressure unit and the metal-oxide-semiconductor export mould
The output end of block is electrically connected, and the output end of the partial pressure unit is electrically connected with the input terminal with reference to comparing unit, the ginseng
The output end for examining comparing unit is electrically connected with the input terminal of the switch control module, the output end of the switch control module with
The control terminal of the metal-oxide-semiconductor output module is electrically connected.It should be noted that the partial pressure unit is used to sample metal-oxide-semiconductor output
Voltage, whether the voltage for being used to compare output with reference to comparing unit is lower than certain value, when being lower than certain value, triggering
Switch control module conducting, and then the shutdown of metal-oxide-semiconductor output module is controlled, to realize the protection to metal-oxide-semiconductor.
Referring to Fig. 1, the switch control module 300 includes switch control unit 310 and optocoupler unit 320, it is described to open
Close control unit control terminal be electrically connected with the output end with reference to comparing unit, the output end of the switch control unit and
The optocoupler unit electrical connection.It should be noted that the switch control unit 310 is used to receive the output with reference to comparing unit
The voltage signal at end, and then output HIGH voltage or low-voltage be to optocoupler unit 320, and then on or off optocoupler unit 320；Institute
It states optocoupler unit 320 and controls voltage signal into metal-oxide-semiconductor output module 400 for realizing output.
Referring to Fig. 2, the switch control unit includes resistance R144, zener diode ZD1 and triode Q110, it is described
One end of resistance R144 is electrically connected with the output end of the metal-oxide-semiconductor output module, the other end of the resistance R144 and described steady
The cathode electrical connection of diode ZD1 is pressed, the anode of the zener diode ZD1 is electrically connected with the base stage of the triode Q110,
The collector of the triode Q110 is electrically connected with the optocoupler unit, the emitter ground connection of the triode Q110.
Referring to Fig. 2, the optocoupler unit includes photoelectrical coupler, resistance R143 and resistance R129, the photoelectric coupling
The anode of the light emitting diode of device is electrically connected with one end of the resistance R143, the yin of the light emitting diode of the photoelectrical coupler
Pole is electrically connected with the output end of the switch control unit, the other end of the resistance R143 and the metal-oxide-semiconductor output module
One end electrical connection of output end electrical connection, the collector of the photoelectrical coupler and the resistance R129, the resistance R129's
For connecting feeder ear VCC, the emitter of the photoelectrical coupler and the control terminal of the metal-oxide-semiconductor output module are electrically connected the other end
It connects.Specifically, the source electrode connection of the metal-oxide-semiconductor of the emitter and primary part of the photoelectrical coupler.
Referring to Fig. 2, the partial pressure unit includes resistance R135 and resistance R146, the first end of the resistance R146 and institute
The output end electrical connection of metal-oxide-semiconductor output module is stated, the second end of the resistance R146 is electrically connected with one end of the resistance R135,
The other end of the resistance R135 is grounded.
Referring to Fig. 2, the reference comparing unit includes three-terminal voltage-stabilizing pipe U105, the reference of the three-terminal voltage-stabilizing pipe U105
End is electrically connected with the second end of the resistance R146, and the cathode of the three-terminal voltage-stabilizing pipe U105 is defeated with the switch control module
Enter end electrical connection, the plus earth of the three-terminal voltage-stabilizing pipe U105.
Referring to Fig. 1, the metal-oxide-semiconductor output module 400 includes switching output unit 410 and control unit 420, it is described to open
The input terminal for closing output unit is electrically connected with the control unit, the output end of the switch output unit and the partial pressure unit
Sampling end electrical connection, the control terminal of described control unit is electrically connected with the output end of the switch control module.It needs to illustrate
, the switch output unit 410 contains metal-oxide-semiconductor, for output voltage；Described control unit 420 is for controlling voltage
Whether output or not, and controls the work of entire circuit.
Referring to Fig. 2, the switch output unit includes capacitor C14, capacitor C15, resistance R33 and metal-oxide-semiconductor Q2, the electricity
Hold C15 both ends be electrically connected respectively with the pole G of the metal-oxide-semiconductor Q2 and the pole S, the both ends of the resistance R33 respectively with the metal-oxide-semiconductor
The pole G of Q2 and the electrical connection of the pole S, the both ends of the capacitor C14 are electrically connected with the pole G of the metal-oxide-semiconductor Q2 and the pole D respectively, and described
The pole S of metal-oxide-semiconductor Q2 is also electrically connected with the control unit, and the pole D of the metal-oxide-semiconductor Q2 is also electric with the input terminal of the partial pressure unit
Connection.
Referring to Fig. 2, described control unit includes main control chip U1 and resistance R28, the CS pin of the main control chip U1
It is electrically connected with one end of the resistance R28, the other end of the resistance R28 is electrically connected with the emitter of the photoelectrical coupler.
Preferably, the main control chip U1 uses the chip of model OB5269CPA.
The course of work: in the case where normal work, output voltage 12V is normal, by resistance R146, resistance R135 resistance point
Pressure value is adjusted to the reference voltage 2.5V greater than three-terminal voltage-stabilizing pipe U105, at this point, the K extremely low level of three-terminal voltage-stabilizing pipe U105,
Voltage-stabiliser tube diode ZD1 is not turned on, triode Q110 cut-off, and no current flows through on resistance R143, and optocoupler U102 is failure to actuate.When
The inside of PMOS tube Q2 can be such that the pressure drop on PMOS tube Q2 increases, about 2V or so because certain reason leads to the pole G and the extremely short road D.
At this point, the partial pressure that output voltage is about 10V or so, resistance R146 and resistance R135 is less than 2.5V, the pole K of three-terminal voltage-stabilizing pipe U105
For high level.Zener diode ZD1 conducting, triode Q110 conducting have current flowing resistance R143, optocoupler work, primary section
The Vcc divided is added in the third foot of U1, U1 shutdown, to export shutdown by the voltage of resistance R129.PMOS tube Q2 is protected.
In this way, switching tube can be effectively protected when switching tube PMOS internal short-circuit, make the control of its temperature reasonable
Specified value.It is excessively high that abnormal temperature rise is not generated.
The utility model compared with the prior art the advantages of and have the beneficial effect that:
The utility model is that a kind of PMOS tube protects circuit, can sample output end metal-oxide-semiconductor by the way that partial pressure unit is arranged
Output voltage, and after comparing by reference to comparing unit the voltage of output end, it outputs voltage signal in switch control module,
So as to output control signals to metal-oxide-semiconductor output module, control metal-oxide-semiconductor whether output voltage；It is different when there is output end voltage
When normal, then it can control the shutdown output of metal-oxide-semiconductor output module, metal-oxide-semiconductor protected by the damage of high temperature, not protect entire circuit
Safe handling, by limiting the temperature rise of pipe in controllable range, thus avoid pipe stablize occur it is abnormal increase, may be used also
To avoid there is burning out metal-oxide-semiconductor and circuit board risk on fire occur.
Embodiment described above only expresses the several embodiments of the utility model, and description is more specific and detailed
Carefully, but it should not be understood as limiting the scope of the patent of the utility model.It should be pointed out that for the general of this field
For logical technical staff, without departing from the concept of the premise utility, various modifications and improvements can be made, these are all
Belong to the protection scope of the utility model.Therefore, the scope of protection shall be subject to the appended claims for the utility model patent.
Claims (10)
1. a kind of PMOS tube protects circuit characterized by comprising partial pressure unit, with reference to comparing unit, switch control module and
Metal-oxide-semiconductor output module, the sampling end of the partial pressure unit are electrically connected with the output end of the metal-oxide-semiconductor output module, the partial pressure
The output end of unit is electrically connected with the input terminal with reference to comparing unit, and the output end with reference to comparing unit is opened with described
Close the input terminal electrical connection of control module, the control terminal of the output end of the switch control module and the metal-oxide-semiconductor output module
Electrical connection.
2. PMOS tube according to claim 1 protects circuit, which is characterized in that the switch control module includes switch control
Unit and optocoupler unit processed, the control terminal of the switch control unit are electrically connected with the output end with reference to comparing unit, institute
The output end for stating switch control unit is electrically connected with the optocoupler unit.
3. PMOS tube according to claim 2 protects circuit, which is characterized in that the switch control unit includes resistance
R144, zener diode ZD1 and triode Q110, the output end of one end of the resistance R144 and the metal-oxide-semiconductor output module
Electrical connection, the other end of the resistance R144 are electrically connected with the cathode of the zener diode ZD1, the zener diode ZD1
Anode be electrically connected with the base stage of the triode Q110, the collector of the triode Q110 is electrically connected with the optocoupler unit
It connects, the emitter ground connection of the triode Q110.
4. PMOS tube according to claim 2 protects circuit, which is characterized in that the optocoupler unit includes photoelectric coupling
One end electricity of device, resistance R143 and resistance R129, the anode of the light emitting diode of the photoelectrical coupler and the resistance R143
Connection, the cathode of the light emitting diode of the photoelectrical coupler are electrically connected with the output end of the switch control unit, the electricity
The other end of resistance R143 is electrically connected with the output end of the metal-oxide-semiconductor output module, the collector of the photoelectrical coupler and described
One end of resistance R129 is electrically connected, and the other end of the resistance R129 is for connecting feeder ear VCC, the hair of the photoelectrical coupler
Emitter-base bandgap grading is electrically connected with the control terminal of the metal-oxide-semiconductor output module.
5. PMOS tube according to claim 1 protects circuit, which is characterized in that the partial pressure unit include resistance R135 and
Resistance R146, the first end of the resistance R146 are electrically connected with the output end of the metal-oxide-semiconductor output module, the resistance R146's
Second end is electrically connected with one end of the resistance R135, the other end ground connection of the resistance R135.
6. PMOS tube according to claim 5 protects circuit, which is characterized in that described steady including three ends with reference to comparing unit
Pressure pipe U105, the reference end of the three-terminal voltage-stabilizing pipe U105 are electrically connected with the second end of the resistance R146, the three-terminal voltage-stabilizing
The cathode of pipe U105 is electrically connected with the input terminal of the switch control module, the plus earth of the three-terminal voltage-stabilizing pipe U105.
7. PMOS tube according to claim 4 protects circuit, which is characterized in that the metal-oxide-semiconductor output module includes switch
The input terminal of output unit and control unit, the switch output unit is electrically connected with the control unit, the switch output
The output end of unit is electrically connected with the sampling end of the partial pressure unit, the control terminal of described control unit and the switch control mould
The output end of block is electrically connected.
8. PMOS tube according to claim 7 protects circuit, which is characterized in that the switch output unit includes capacitor
C14, capacitor C15, resistance R33 and metal-oxide-semiconductor Q2, the both ends of the capacitor C15 are electrically connected with the pole G of the metal-oxide-semiconductor Q2 and the pole S respectively
Connect, the both ends of the resistance R33 are electrically connected with the pole G of the metal-oxide-semiconductor Q2 and the pole S respectively, the both ends of the capacitor C14 respectively with
The pole G of the metal-oxide-semiconductor Q2 and the electrical connection of the pole D, and the pole S of the metal-oxide-semiconductor Q2 is also electrically connected with the control unit, the MOS
The pole D of pipe Q2 is also electrically connected with the input terminal of the partial pressure unit.
9. PMOS tube according to claim 7 protects circuit, which is characterized in that described control unit includes main control chip U1
And resistance R28, the CS pin of the main control chip U1 are electrically connected with one end of the resistance R28, the other end of the resistance R28
It is electrically connected with the emitter of the photoelectrical coupler.
10. PMOS tube according to claim 9 protects circuit, which is characterized in that the main control chip U1 uses model
The chip of OB5269CPA.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920152818.3U CN209592973U (en) | 2019-01-27 | 2019-01-27 | PMOS tube protects circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920152818.3U CN209592973U (en) | 2019-01-27 | 2019-01-27 | PMOS tube protects circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209592973U true CN209592973U (en) | 2019-11-05 |
Family
ID=68381223
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920152818.3U Expired - Fee Related CN209592973U (en) | 2019-01-27 | 2019-01-27 | PMOS tube protects circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209592973U (en) |
-
2019
- 2019-01-27 CN CN201920152818.3U patent/CN209592973U/en not_active Expired - Fee Related
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Granted publication date: 20191105 |