CN215009585U - Spring contact protection circuit - Google Patents
Spring contact protection circuit Download PDFInfo
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- CN215009585U CN215009585U CN202023232695.6U CN202023232695U CN215009585U CN 215009585 U CN215009585 U CN 215009585U CN 202023232695 U CN202023232695 U CN 202023232695U CN 215009585 U CN215009585 U CN 215009585U
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Abstract
The utility model provides a spring contact protection circuit, include: a base circuit and an access circuit; the base circuit includes 3 spring contacts: the contact device comprises a first spring type contact, a second spring type contact and a third spring type contact; one end of the first spring contact, one end of the second spring contact and one end of the third spring contact are electrically connected with the base circuit, and the other end of the first spring contact, the second spring contact and the third spring contact are electrically connected with the access circuit. The base circuit comprises an MOS circuit, a conduction control circuit and a disconnection control circuit; the output end of the on-state control circuit is electrically connected with the second input end of the MOS circuit after being connected in series with the output end of the off-state control circuit, the first input end of the MOS circuit is connected with a power supply, and the output end of the MOS circuit is electrically connected with one end of the first spring type contact; 3 spring contact realization and base and access circuit power supply, through the MOS circuit of base circuit, switch on control circuit, disconnection control circuit, realized need not add MCU control circuit can effectual solution spring contact possess the problem of voltage for a long time.
Description
Technical Field
The utility model relates to a protection circuit field, concretely relates to spring contact protection circuit.
Background
With the prosperity of smart phones, various smart devices around the smart phones, such as smart watches, smart bracelets, smart glasses and the like, VR, TWS bluetooth earphones, smart sound boxes and the like, are driven to emerge, and have a common characteristic, and a spring contact scheme is generally used in a power supply/charging connection mode; the spring contact can be a very fine probe, the size can be very small, the stability of power supply/charging current, low impedance and low loss can be realized, and a large-current connection scheme can be realized.
At present, two spring contact schemes of the charging seat exist, wherein one scheme is that the spring contact always has voltage output; one is that the charging seat spring contact realizes no voltage output scheme when no host computer is accessed through MCU control.
There is always a disadvantage of voltage output for spring contacts: 1. short-circuit discharge sparks can occur once the short-circuit discharge sparks are contacted by an external metal object, and the Pogo pin is damaged; 2. there is the water droplet between the Pogo pin, because there is fixed voltage to exist between the spring contact, leads to there being the electric field production between the spring contact to take place the electron migration phenomenon, can make the spring contact take place chemical reaction.
The spring contact is controlled by the MCU to realize the defect that no voltage output exists when no host is accessed: the MCU is used for controlling to realize a non-voltage output scheme when a non-host computer is accessed, so that the defect that the spring type contact always has voltage output is overcome, the circuit of the original charging base becomes complicated, a power switch, a power conversion module and an MCU module need to be added, and the software development and BOM cost of the product are increased.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defects of the prior art, the utility model aims to solve the technical problem that a spring contact protection circuit is proposed, 3 spring contacts realize and the base and access circuit power supply, through base circuit's MOS circuit, on-control circuit, disconnection control circuit, realized need not add MCU control circuit can effectually solve the problem that the spring contact possesses voltage for a long time.
To achieve the purpose, the utility model adopts the following technical proposal:
the utility model provides a pair of spring contact protection circuit, include: a base circuit and an access circuit; the base circuit includes 3 spring contacts: the contact device comprises a first spring type contact, a second spring type contact and a third spring type contact; one end of the first spring contact, one end of the second spring contact and one end of the third spring contact are electrically connected with the base circuit, and the other end of the first spring contact, the second spring contact and the third spring contact are electrically connected with the access circuit. The base circuit comprises an MOS circuit, a conduction control circuit and a disconnection control circuit; the output end of the on-state control circuit is electrically connected with the second input end of the MOS circuit after being connected in series with the output end of the off-state control circuit, the first input end of the MOS circuit is connected with the power supply, and the output end of the MOS circuit is electrically connected with one end of the first spring contact.
Preferably, the first input end of the MOS circuit is connected with the power supply, and the second output end of the conduction control circuit and the second output end of the disconnection control circuit are both electrically connected with one end of the second spring type contact.
Preferably, the access circuit comprises a detection circuit and a main control circuit; the input end of the detection circuit is electrically connected with the second spring type contact, the output end of the detection circuit is electrically connected with the first input end of the main control circuit, and the second input end of the main control circuit is electrically connected with the first spring type contact.
Preferably, the MOS circuit comprises a MOS transistor and a transistor Q4; the MOS pipe S utmost point is connected with the power, and MOS pipe D utmost point is connected with the access circuit electricity, and triode Q4 ' S base is connected with the control circuit output that switches on and the control circuit output that breaks off electricity, and triode Q4 ' S collecting electrode is connected with the G utmost point of MOS pipe, and triode Q4 ' S projecting pole ground connection.
Preferably, the conduction control circuit comprises a transistor Q2, a resistor R4, a resistor R5, a resistor R8 and a resistor R19; an emitter of the triode Q2 is connected with the power supply after being connected with the resistor R4 in series, a base of the triode Q2 is connected with the second spring type contact, a collector of the triode Q2 is electrically connected with an input end of the MOS circuit, the R5 is connected with a collector of the triode Q2 in series and then grounded, one end of the resistor R19 is connected between the emitter of the triode Q2 and the resistor R4, the other end of the resistor R19 is grounded, one end of the resistor R8 is connected between the resistor R4 and the power supply, and the other end of the resistor R8 is connected between the second spring type contact and the base of the triode Q2.
Preferably, the disconnection control circuit comprises a transistor Q3, a transistor Q5, a resistor R10, a resistor R11, a resistor R14, a resistor R16 and a capacitor C2; the collector of the triode Q3 is electrically connected with the input end of the MOS circuit, the emitter of the triode Q3 is grounded, the resistor R10 and the resistor R11 are electrically connected with the base of the triode Q3 after being connected in parallel, the other end of the resistor R11 is grounded, the other end of the resistor R10 is electrically connected with the collector of the triode Q5, the resistor R9 and the resistor R14 are electrically connected with the emitter of the triode Q5 after being connected in parallel, the other end of the resistor R14 is grounded, the other end of the resistor R9 is connected with the power supply, the resistor R17 is electrically connected with the base of the triode Q5 after being connected in parallel with the resistor R16, the other end of the resistor R16 is connected between the power supply and the resistor R9, the other end of the resistor R17 is connected with the second spring type contact, one end of the capacitor C2 is connected between the resistor R17 and the second spring type contact, and the other end of the capacitor C2 is grounded.
Preferably, the detection circuit comprises a triode Q6, a resistor R13, a resistor R15 and a resistor R18; the resistor R15 and the resistor R18 are connected in series and then are connected to the base electrode of the triode Q6, the other end of the resistor R15 is connected with the second spring type contact, the other end of the resistor R18 is connected with the emitter electrode of the triode Q6 and then is grounded, and the resistor R13 is connected with the collector electrode of the triode Q6.
The utility model has the advantages that:
the utility model provides a spring contact protection circuit, 3 spring contacts realize and base and access circuit power supply, through MOS circuit, the on-off control circuit of base circuit, whether through the switching on of MOS circuit and switching off the realization to access circuit, and the on-off control circuit and the off-off control circuit are used for controlling the switching on and off of MOS circuit respectively; when the access circuit is connected with the base circuit through the spring type contact, the conduction control circuit receives a voltage signal to conduct, meanwhile, the disconnection control circuit is cut off, the conduction voltage of the conduction control circuit is transmitted to the MOS circuit, and the MOS in the MOS circuit is conducted, so that the base circuit supplies power for the access circuit.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1 is a schematic structural diagram provided in an embodiment of the present invention;
fig. 2 is a schematic circuit diagram provided in an embodiment of the present invention;
fig. 3 is a schematic simulation diagram provided in the embodiment of the present invention.
The attached drawings are as follows: 1 a base circuit; 11MOS circuit; 12 turning on the control circuit; 13 disconnecting the control circuit; 2, accessing a circuit; 21 a detection circuit; 22 master control circuit.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
The technical solution of the present invention is further explained by the following embodiments with reference to the accompanying drawings.
As shown in fig. 1-2, the spring-type contact protection circuit provided in this embodiment includes: a base circuit 1 and an access circuit 2; base circuit 1 includes 3 spring contacts: the contact device comprises a first spring type contact, a second spring type contact and a third spring type contact; one end of the first spring contact, one end of the second spring contact and one end of the third spring contact are electrically connected with the base circuit 1, and the other end of the first spring contact, the second spring contact and the third spring contact are electrically connected with the access circuit 2. The base circuit 1 comprises a MOS circuit 11, a conduction control circuit 12 and a disconnection control circuit 13; the output end of the on-state control circuit 12 is connected with the output end of the off-state control circuit 13 and then connected to the second input end of the MOS circuit 11, the first input end of the MOS circuit 11 is connected with the power supply, and the output end of the MOS circuit 11 is electrically connected with the access circuit 2. Specifically, first spring contact, second spring contact, third spring contact are all for Pogo pin, and wherein first spring contact is used for the voltage output terminal point for POGO VOUT, and the second spring contact is used for the test contact for POGO DET, and the third spring contact is used for ground contact for POGO GND, judges through base circuit 1 whether to put through with access circuit 2, if put through then for access circuit 2 supplies power.
Preferably, the base circuit 1 includes a MOS circuit 11, a turn-on control circuit 12, and a turn-off control circuit 13; the first input end of the MOS circuit 11 is connected with a power supply, the output end of the MOS circuit is electrically connected with one end of the first spring type contact, the first output end of the conduction control circuit 12 is electrically connected with the second input end of the MOS circuit 11 after being connected with the first output end of the disconnection control circuit 13 in series, and the second output end of the conduction control circuit 12 and the second output end of the disconnection control circuit 13 are both electrically connected with one end of the second spring type contact. Specifically, whether power is supplied to the access circuit 2 or not is realized by turning on and off the MOS circuit 11, and the on control circuit 12 and the off control circuit 13 are respectively used for controlling the on and off of the MOS circuit 11; when the access circuit 2 is connected with the base circuit 1 through the spring type contact, the conduction control circuit 12 receives a voltage signal to conduct, and simultaneously cuts off the disconnection control circuit 13, the conduction voltage of the conduction control circuit 12 is transmitted to the MOS circuit 11, MOS in the MOS circuit 11 is conducted, and the base circuit 1 supplies power for the access circuit 2.
Preferably, the access circuit 2 comprises a detection circuit 21 and a master control circuit 22; the input end of the detection circuit 21 is electrically connected with the second spring type contact, the output end of the detection circuit 21 is electrically connected with the first input end of the main control circuit 22, and the second input end of the main control circuit 22 is electrically connected with the first spring type contact.
Preferably, the MOS circuit 11 includes a MOS transistor, a transistor Q4; the MOS pipe S utmost point is connected with the power, and MOS pipe D utmost point is connected with access circuit 2 electricity, and triode Q4 ' S base is connected with the output of switching on control circuit 12 and the output of disconnection control circuit 13 electricity, and triode Q4 ' S collecting electrode is connected with the G utmost point of MOS pipe, and triode Q4 ' S projecting pole ground connection. Specifically, the MOS circuit 11 further includes a resistor R1, a resistor R2, a resistor R7, and a capacitor C1; one end of the resistor R1 connected with the capacitor C1 in parallel is connected with the S pole of the MOS tube, the other end of the resistor R1 is connected with the G pole of the MOS tube, the resistor R2 is connected with the D pole of the MOS tube in series and then grounded, and the resistor R7 is connected between the G pole of the MOS tube and the collector of the triode Q4 in series.
Preferably, the conduction control circuit 12 includes a transistor Q2, a resistor R4, a resistor R5, a resistor R8, and a resistor R19; an emitter of the triode Q2 is connected with the power supply after being connected with the resistor R4 in series, a base of the triode Q2 is connected with the second spring type contact, a collector of the triode Q2 is electrically connected with the input end of the MOS circuit 11, the R5 is connected with a collector of the triode Q2 in series and then grounded, one end of the resistor R19 is connected between the emitter of the triode Q2 and the resistor R4, the other end of the resistor R19 is grounded, one end of the resistor R8 is connected between the resistor R4 and the power supply, and the other end of the resistor R8 is connected between the second spring type contact and the base of the triode Q2.
Preferably, the disconnection control circuit 13 includes a transistor Q3, a transistor Q5, a resistor R10, a resistor R11, a resistor R14, a resistor R16, and a capacitor C2; the collector of the triode Q3 is electrically connected with the input end of the MOS circuit 11, the emitter of the triode Q3 is grounded, the resistor R10 and the resistor R11 are electrically connected with the base of the triode Q3 after being connected in parallel, the other end of the resistor R11 is grounded, the other end of the resistor R10 is electrically connected with the collector of the triode Q5, the resistor R9 and the resistor R14 are electrically connected with the emitter of the triode Q5 after being connected in parallel, the other end of the resistor R14 is grounded, the other end of the resistor R9 is connected with a power supply, the resistor R17 and the resistor R16 are electrically connected with the base of the triode Q5 after being connected in parallel, the other end of the resistor R16 is connected between the power supply and the resistor R9, the other end of the resistor R17 is connected with the second spring type contact, one end of the capacitor C2 is connected between the resistor R17 and the second spring type contact, and the other end of the capacitor C2 is grounded.
Preferably, the detection circuit 21 includes a transistor Q6, a resistor R13, a resistor R15, and a resistor R18; the resistor R15 and the resistor R18 are connected in series and then are connected to the base electrode of the triode Q6, the other end of the resistor R15 is connected with the second spring type contact, the other end of the resistor R18 is connected with the emitter electrode of the triode Q6 and then is grounded, and the resistor R13 is connected with the collector electrode of the triode Q6.
With reference to the simulation circuit diagram of fig. 3, the spring contacts can be protected when the base circuit 1 encounters different situations, as follows:
1. when the access circuit 2 is not connected to the base circuit 1
The base circuit 1 is suspended, no voltage is output from the first spring contact, the second spring contact is suspended in a network manner, the base voltage of the triode Q2 in the conduction control circuit 12 is equal to a power supply VCC, Ved of the triode Q2 is less than 0.6V, and the triode Q2 is in a cut-off state; similarly, the transistor Q5 of the off control circuit 13 is also in the off state; finally, the MOS tube of the MOS circuit 11 can not be conducted, and finally, the base circuit 1 does not apply voltage to the spring contact when not connected with the access circuit 2, so that the fault caused by the fact that the spring contact continuously holds the voltage is avoided;
2. when the first spring contact is short-circuited to ground due to external abnormality
The access circuit 2 is not connected with the base circuit 1, the first spring contact is in a suspended state, and the voltage of the first spring contact is 0V, so that the first spring contact is short-circuited to the ground due to external abnormality, and short-circuit sparks cannot be generated.
3. The first spring contact causes short circuit to the second spring contact due to external abnormality
When the second spring type contact is short-circuited due to external abnormality, the base voltage of the triode Q2 is 16.6V due to the fact that VCC passes through the resistor R8 and the resistor R16+ R17 to form parallel connection and then is divided by the resistor R2; VCC is divided by R4, the voltage of the emitter of the transistor Q2 is 9.5V by R19, it is obvious that Veb of the transistor Q2 is less than 0.6V, and the transistor Q2 is in a cut-off state. Similarly, the transistor Q5 is also in the off state; the MOS transistor of the MOS circuit 11 cannot be turned on, so the first spring contact causes a short circuit to the second spring contact due to an external abnormality, and a short spark does not occur.
4. The second spring contact causes a ground short circuit due to an external abnormality
When the second spring contact is short-circuited due to external abnormality, the power supply VCC forms a partial voltage through the resistor R16 and the resistor R17, so that the base voltage of the triode Q5 is 2.06V, VCC forms a partial voltage through the resistor R9 and the resistor R14, the emitter voltage of the triode Q5 is 9.5V, so that Veb (9.5-2.06) is 7.44V >0.7V, the triode Q5 is conducted, and the collector output voltage of the Q5 is 2.76V; then, through the resistor R10, R11 divides the voltage to make the transistor Q3 conduct, so that the collector voltage of the transistor Q3 is at low level 71.9mV, the MOS transistor of the MOS circuit 11 can not conduct, and at the same time, because the current of the second spring contact and the ground short circuit is only 1.39mA, the second spring contact causes the ground short circuit due to the external abnormality, and the short spark can not be generated
5. When the first spring contact, the second spring contact and the third spring contact are all short-circuited together due to external abnormity
As in the case of the 4 th aspect, the conduction of the transistor Q5 causes the transistor Q4 to be turned off, so that the MOS transistor of the MOS circuit 11 cannot be turned on, and the short-circuited current is only 1.39mA, so that the first spring-type contact, the second spring-type contact and the third spring-type contact are all shorted together due to the external abnormality, and no short-circuit spark is generated.
6. When water drops exist on the spring contact, rapid electronic migration cannot occur, and the spring contact is poor in contact or impedance is increased to cause ugly
The simulation circuit S6 is closed and R6100 k Ω simulates a water droplet on the spring contact. Although the second spring type contact network has voltage, the current-limiting resistors R16+ R17 and R8 are arranged at the front ends, so that the voltage of the second spring type contact network is not direct VCC voltage, and the current is only 166uA, so that the ionization phenomenon is effectively weakened; as ionization proceeds, the resistance of water decreases, but due to the partial pressure and current limiting effects of the resistors R16+ R17 and R8, the voltage of the second spring contact decreases, and finally an equilibrium state is reached, and the current is 309uA, so that the ionization phenomenon is effectively weakened; since the spring contact surface is not a container, the water drops are long and naturally not existed. The ionization phenomenon is stopped and S6 is turned off and restored to the original state.
In conclusion, water drops exist on the spring contact, so that rapid electron migration cannot occur, and poor contact or increased impedance of the spring contact is caused.
7. When connected to the base circuit 1
The MOS tube of the MOS circuit 11 is conducted, and the base circuit 1 supplies power to the access circuit 2 normally
VCC divides voltage through resistors R8, R15 and a triode Q6, so that the voltage of the second spring contact is 8.18V; VCC is divided by a resistor R4, and the voltage divided by the resistor R19 is 9.5V, so that Veb of the transistor Q2 is (9.5-8.18) V is 1.32V >0.7V, and the transistor Q2 is turned on; meanwhile, VCC enters resistors R16 and R17 and the second spring type contact network to form a partial voltage, so that the base voltage of the triode Q5 is 9.17V, VCC passes through the resistors R9 and R14, and the partial voltage enables Veb (9.5-9.17) V of the triode Q5 to be 0.33V <0.6V, so that the triode Q5 is cut off, and the triode Q3 is cut off. Transistor Q4 is thus conductive, causing transistor Q1 to conduct. The base circuit 1 is completed to normally supply power to the access circuit 2.
8. ESD protection
Because the base circuit 1 is only a circuit formed by discrete components and no MCU is used, the possible abnormal working condition of the MCU caused by ESD can be avoided, meanwhile, the input detection of the base circuit 1 is isolated by the triode Q6, and the natural ESD can not be directly applied to the second spring type contact network, so that the ESD can not directly enter the control main control circuit 22 of the access circuit 2, and the effect of ESD resistance is achieved.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A spring-loaded contact protection circuit, comprising: a base circuit and an access circuit;
the base circuit includes 3 spring contacts: the contact device comprises a first spring type contact, a second spring type contact and a third spring type contact;
one end of each of the first spring contact, the second spring contact and the third spring contact is electrically connected with the base circuit, and the other end of each of the first spring contact, the second spring contact and the third spring contact is electrically connected with the access circuit;
the base circuit comprises an MOS circuit, a conduction control circuit and a disconnection control circuit;
the output end of the conduction control circuit is electrically connected with the second input end of the MOS circuit after being connected in series with the output end of the disconnection control circuit, the first input end of the MOS circuit is connected with a power supply, and the output end of the MOS circuit is electrically connected with one end of the first spring type contact.
2. The spring loaded contact protection circuit of claim 1, wherein:
the first input end of the MOS circuit is connected with a power supply, and the second output end of the conduction control circuit and the second output end of the disconnection control circuit are electrically connected with one end of the second spring type contact.
3. The spring loaded contact protection circuit of claim 1, wherein: the access circuit comprises a detection circuit and a main control circuit;
the input end of the detection circuit is electrically connected with the second spring type contact, the output end of the detection circuit is electrically connected with the first input end of the main control circuit, and the second input end of the main control circuit is electrically connected with the first spring type contact.
4. The spring loaded contact protection circuit of claim 2, wherein: the MOS circuit comprises an MOS tube and a triode Q4;
the MOS pipe S utmost point is connected with the power, MOS pipe D utmost point with the access circuit electricity is connected, triode Q4 ' S base with the control circuit output that switches on with the control circuit output electricity is connected, triode Q4 ' S collecting electrode with the G utmost point electricity of MOS pipe is connected, triode Q4 ' S projecting pole ground connection.
5. The spring loaded contact protection circuit of claim 2, wherein: the conduction control circuit comprises a triode Q2, a resistor R4, a resistor R5, a resistor R8 and a resistor R19;
the emitter of triode Q2 is connected with the power after being connected with resistor R4 in series, the base of triode Q2 with the second spring contact is connected, the collector of triode Q2 with MOS circuit input end electricity is connected, R5 with the collector of triode Q2 is grounded after being connected in series, resistor R19 one end connect in the emitter of triode Q2 with between resistor R4, the other end of resistor R19 is grounded, resistor R8 one end connect in between resistor R4 and the power, the other end of resistor R8 connect in between the second spring contact and the base of triode Q2.
6. The spring loaded contact protection circuit of claim 2, wherein: the disconnection control circuit comprises a triode Q3, a triode Q5, a resistor R9, a resistor R10, a resistor R11, a resistor R14, a resistor R16, a resistor R17 and a capacitor C2;
the collector of the transistor Q3 is electrically connected with the input terminal of the MOS circuit, the emitter of the transistor Q3 is grounded, the resistor R10 and the resistor R11 are electrically connected with the base of the triode Q3 after being connected in parallel, the other end of the resistor R11 is grounded, the other end of the resistor R10 is electrically connected with the collector of the triode Q5, the resistor R9 and the resistor R14 are electrically connected with the emitter of the triode Q5 after being connected in parallel, the other end of the resistor R14 is grounded, the other end of the resistor R9 is connected with a power supply, the resistor R17 is connected with the resistor R16 in parallel and then is electrically connected with the base electrode of the triode Q5, the other end of the resistor R16 is connected between a power supply and the resistor R9, the other end of the resistor R17 is connected with the second spring type contact, one end of the capacitor C2 is connected between the resistor R17 and the second spring contact, and the other end of the capacitor C2 is grounded.
7. The spring loaded contact protection circuit of claim 3, wherein: the detection circuit comprises a triode Q6, a resistor R13, a resistor R15 and a resistor R18;
the resistor R15 and the resistor R18 are connected in series and then connected to the base of the triode Q6, the other end of the resistor R15 is connected with the second spring type contact, the other end of the resistor R18 is connected with the emitter of the triode Q6 and then grounded, and the resistor R13 is connected with the collector of the triode Q6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023232695.6U CN215009585U (en) | 2020-12-28 | 2020-12-28 | Spring contact protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023232695.6U CN215009585U (en) | 2020-12-28 | 2020-12-28 | Spring contact protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215009585U true CN215009585U (en) | 2021-12-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202023232695.6U Active CN215009585U (en) | 2020-12-28 | 2020-12-28 | Spring contact protection circuit |
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| Country | Link |
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| CN (1) | CN215009585U (en) |
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- 2020-12-28 CN CN202023232695.6U patent/CN215009585U/en active Active
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