CN215818084U - Power switch control circuit - Google Patents
Power switch control circuit Download PDFInfo
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- CN215818084U CN215818084U CN202121356412.0U CN202121356412U CN215818084U CN 215818084 U CN215818084 U CN 215818084U CN 202121356412 U CN202121356412 U CN 202121356412U CN 215818084 U CN215818084 U CN 215818084U
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Abstract
The utility model discloses a power switch control circuit which comprises a power supply, a switch circuit, a wire holder, a switch piece, a main control chip, a first resistor, a triode and a second resistor. The first pin and the second pin of the wire holder are connected through the switch piece, and the first pin of the wire holder is connected with the switch enabling end of the switch circuit. The first serial input/output port of the main control chip is connected with one end of a first resistor, the other end of the first resistor is simultaneously connected with one end of a second resistor and the base electrode of a triode, and the collector electrode of the triode is connected with the switch enabling end of the switch circuit. The power supply is connected with the signal input end of the switch circuit, and the signal output end of the switch circuit is used for being connected with the power supply end of the electronic equipment. The second pin of the wire holder, the emitting electrode of the triode and the other end of the second resistor are all grounded, the triode is an NPN type triode, and the switching circuit is conducted when the switch enabling end is at a low level. The utility model realizes that the same control circuit is suitable for switches of different types, is convenient to use and can meet different requirements of users.
Description
Technical Field
The utility model relates to the field of switch circuit design, in particular to a power switch control circuit.
Background
Today, there are many control structures for switching control of electronic devices. The common ones are boat-shaped switch, touch button, etc. The ship-type switch is also called a rocker switch, and can keep a converted state when the switch state is converted, and a corresponding power switch control circuit is matched for controlling the on or off of the electronic equipment. Unlike the ship-type switch, the light touch button will automatically reset if the external force is removed after being pressed. Because the working modes of different switches are different, the corresponding power switch control circuits are different. The existing power switch control circuit can only match with one switch, so that the power switch control circuit is very inconvenient to install and use and cannot meet different requirements of users.
SUMMERY OF THE UTILITY MODEL
The technical problem to be solved by the utility model is as follows: the power switch control circuit is compatible with different types of switches, convenient to use and capable of meeting different requirements of users.
In order to solve the technical problems, the utility model adopts the technical scheme that:
a power switch control circuit comprises a power supply, a switch circuit, a wire holder, a switch piece, a main control chip, a first resistor, a triode and a second resistor;
the first pin and the second pin of the wire holder are connected through the switch piece, and the first pin of the wire holder is connected with the switch enabling end of the switch circuit;
a first serial input/output port of the main control chip is connected with one end of the first resistor, the other end of the first resistor is simultaneously connected with one end of the second resistor and the base electrode of the triode, and the collector electrode of the triode is connected with the switch enabling end of the switch circuit;
the power supply is connected with the signal input end of the switch circuit, and the signal output end of the switch circuit is used for connecting the power supply end of the electronic equipment;
the second pin of the wire holder, the emitting electrode of the triode and the other end of the second resistor are all grounded, the triode is an NPN type triode, and the switch circuit is conducted when the switch enabling end is at a low level.
Further, the power supply also comprises a first diode, an external power supply, a third resistor and a fourth resistor;
the negative electrode of the first diode is connected with the first pin of the wire holder, the positive electrode of the first diode is simultaneously connected with one end of the third resistor and one end of the fourth resistor, the other end of the third resistor is connected with the external power supply, and the other end of the fourth resistor is connected with the second serial input/output port of the main control chip.
Further, the switch circuit comprises an MOS tube, a fifth resistor, a sixth resistor, a first capacitor, a second capacitor and a third capacitor;
one end of the fifth resistor is a switch enabling end of the switch circuit, the other end of the fifth resistor is simultaneously connected with one end of the first capacitor, one end of the sixth resistor and the grid electrode of the MOS tube, the other end of the first capacitor is simultaneously connected with the anode output end of the power supply, one end of the second capacitor, the other end of the sixth resistor, one end of the third capacitor and the source electrode of the MOS tube, and the drain electrode of the MOS tube is used for connecting the power supply end of the electronic equipment;
the other end of the second capacitor and the other end of the third capacitor are both grounded, and the MOS tube is a P-channel MOS tube.
Further, the switching circuit further comprises a transient suppression diode;
the cathode of the transient suppression diode is connected with the source electrode of the MOS tube, and the anode of the transient suppression diode is grounded.
Further, the switch circuit further comprises a fourth capacitor;
one end of the fourth capacitor is connected with the source electrode of the MOS tube, and the other end of the fourth capacitor is grounded.
Further, the switch circuit further comprises a fifth capacitor, an electrolytic capacitor and a seventh resistor;
and the drain electrode of the MOS tube is simultaneously connected with one end of the fifth capacitor, the anode of the electrolytic capacitor and one end of the seventh resistor, and the other end of the fifth capacitor, the cathode of the electrolytic capacitor and the other end of the seventh resistor are all grounded.
Further, the device also comprises a power interface;
and the power supply is connected with the signal input end of the switch circuit through the power interface.
Further, a second diode and a third diode are also included;
and the collector of the triode is connected with the switch enabling end of the switch circuit through the reverse connection of the second diode, and the first pin of the wire holder is connected with the switch enabling end of the switch circuit through the reverse connection of the third diode.
Further, a sixth capacitor is also included;
one end of the sixth capacitor is connected with the collector of the triode, and the other end of the sixth capacitor is grounded.
In conclusion, the beneficial effects of the utility model are as follows: when the switch piece is a switch similar to a ship-shaped switch, the first wiring pin and the second wiring pin of the wiring base are conducted through the toggle switch, so that the level of the switch enabling end of the switch circuit is lowered, the switch circuit is connected, and the electronic equipment supplies power normally; when the switch piece is a switch similar to a light touch key, after the switch piece is pressed down, the first serial input/output port of the main control chip can be used for outputting high level to conduct the triode, so that the level of the switch enabling end of the switch circuit is lowered, the switch circuit is switched on, and the electronic equipment is normally powered. Therefore, the control circuit is suitable for switches of different types, is convenient to use, and can meet different requirements of users.
Drawings
Fig. 1 is a schematic connection diagram of a control circuit for controlling a switch enable terminal of a switch circuit in a power switch control circuit according to an embodiment of the present invention;
fig. 2 is a circuit connection diagram of a switch circuit of a power switch control circuit according to an embodiment of the utility model.
Description of reference numerals:
c1, a first capacitance; c2, a second capacitor; c3, a third capacitance; c4, a fourth capacitance; c5, a fifth capacitance; c6, a sixth capacitor; CP, electrolytic capacitor;
d1, a first diode; d2, a second diode; d3, a third diode; DC. A power supply;
j1, a wire holder; j2, power interface;
q1, triode;
PWR _ EN, switch enable terminal;
r1, a first resistor; r2, a second resistor; r3, third resistor; r4, fourth resistor; r5, fifth resistor; r6, sixth resistor; r7, seventh resistor;
t1 and MOS tubes; TVS, transient suppression diode;
u1, a main control chip;
v1, external power supply.
Detailed Description
In order to explain technical contents, achieved objects, and effects of the present invention in detail, the following description is made with reference to the accompanying drawings in combination with the embodiments.
Referring to fig. 1 and 2, a power switch control circuit includes a power supply DC, a switch circuit, a wire holder J1, a switch, a main control chip U1, a first resistor R1, a transistor Q1, and a second resistor R2;
the first pin and the second pin of the wire holder J1 are connected through the switch piece, and the first pin of the wire holder J1 is connected with a switch enable terminal PWR _ EN of the switch circuit;
a first serial input/output port of the main control chip U1 is connected to one end of the first resistor R1, the other end of the first resistor R1 is connected to one end of the second resistor R2 and the base of the triode Q1, and the collector of the triode Q1 is connected to the switch enable terminal PWR _ EN of the switch circuit;
the power supply DC is connected with the signal input end of the switch circuit, and the signal output end of the switch circuit is used for connecting the power supply end of the electronic equipment;
the second pin of the wire holder J1, the emitter of the transistor Q1, and the other end of the second resistor R2 are all grounded, the transistor Q1 is an NPN-type transistor Q1, and the switching circuit is turned on when the switch enable terminal PWR _ EN is at a low level.
From the above description, the beneficial effects of the present invention are: when the switch piece is a switch similar to a ship-shaped switch, a first wiring pin and a second wiring pin of a wiring seat J1 are conducted through a toggle switch, so that the level of a switch enabling end PWR _ EN of a switch circuit is lowered, the switch circuit is switched on, and the electronic equipment supplies power normally; when the switch element is a switch similar to a light touch key, after the switch element is pressed down, a first serial input/output port of the main control chip U1 can be used for outputting a high level to conduct the triode Q1, so that the level of a switch enabling end PWR _ EN of the switch circuit is lowered, the switch circuit is switched on, and the electronic equipment normally supplies power. Therefore, the control circuit is suitable for switches of different types, is convenient to use, and can meet different requirements of users.
Further, the power supply further comprises a first diode D1, an external power supply V1, a third resistor R3 and a fourth resistor R4;
the negative electrode of the first diode D1 is connected with the first pin of the wire holder J1, the positive electrode of the first diode D1 is connected with one end of the third resistor R3 and one end of the fourth resistor R4, the other end of the third resistor R3 is connected with the external power supply V1, and the other end of the fourth resistor R4 is connected with the second serial input/output port of the main control chip U1.
From the above description, when the switch device on the wire holder J1 is closed, that is, the first pin of the wire holder J1 is grounded, the main control chip U1 can detect the level change at the connection point of the third resistor R3 and the first diode D1 through the second serial i/o port, so as to determine the state of the switch device. Therefore, the main control chip U1 can output a high level through the first serial input/output port after detecting that the switch element is in a closed state for a long time, so that the triode Q1 is cut off; the switch enable terminal PWR _ EN of the switching circuit is in a floating state, thereby powering off the device. In other words, the first diode D1, the external power supply V1, and other components cooperate to realize the power-off function of the electronic device when the power button is pressed for a long time.
Further, the switch circuit comprises a MOS transistor T1, a fifth resistor R5, a sixth resistor R6, a first capacitor C1, a second capacitor C2 and a third capacitor C3;
one end of the fifth resistor R5 is a switch enable end PWR _ EN of the switch circuit, the other end of the fifth resistor R5 is simultaneously connected to one end of the first capacitor C1, one end of the sixth resistor R6 and the gate of the MOS transistor T1, the other end of the first capacitor C1 is simultaneously connected to the positive output end of the power supply DC, one end of the second capacitor C2, the other end of the sixth resistor R6, one end of the third capacitor C3 and the source of the MOS transistor T1, and the drain of the MOS transistor T1 is used for connecting the power supply end of the electronic device;
the other end of the second capacitor C2 and the other end of the third capacitor C3 are both grounded, and the MOS transistor T1 is a P-channel MOS transistor T1.
As can be seen from the above description, the switching circuit utilizes the switching characteristic of the MOS transistor T1 to control the electronic device to supply power, and uses one end of the fifth resistor R5 connected to the gate of the MOS transistor T1 as the switch enable terminal PWR _ EN, so that when the potential of the fifth resistor R5 changes, the voltage difference between the gate and the source of the MOS transistor T1 changes accordingly, and the MOS transistor T1 is turned on or off.
Further, the switching circuit further comprises a transient suppression diode TVS;
the cathode of the transient suppression diode TVS is connected to the source of the MOS transistor T1, and the anode of the transient suppression diode TVS is grounded.
As can be seen from the above description, the transient suppression diode TVS is connected in parallel in the circuit, so as to prevent other devices in the circuit from receiving the influence of the transient pulse, and thus, perform a protection function.
Further, the switch circuit further comprises a fourth capacitor C4;
one end of the fourth capacitor C4 is connected to the source of the MOS transistor T1, and the other end of the fourth capacitor C4 is grounded.
As can be seen from the above description, the fourth capacitor C4 is a filter capacitor for stabilizing the power output of the power supply DC.
Further, the switch circuit further comprises a fifth capacitor C5, an electrolytic capacitor CP and a seventh resistor R7;
the drain of the MOS transistor T1 is simultaneously connected to one end of the fifth capacitor C5, the anode of the electrolytic capacitor CP and one end of the seventh resistor R7, and the other end of the fifth capacitor C5, the cathode of the electrolytic capacitor CP and the other end of the seventh resistor R7 are all grounded.
From the above description, the electrolytic capacitor CP and the seventh resistor R7 form a resistance-capacitance filter network, and filter the drain output of the MOS transistor T1, so as to obtain a stable power supply output and use the power supply output for supplying power to the electronic device.
Further, a power interface J2 is also included;
the power supply DC is connected to the signal input terminal of the switching circuit via the power interface J2.
From the above description, the power supply DC is connected to the whole power switch control circuit through the power interface J2, and when the power supply is not needed, the power supply DC is pulled out from the power interface J2.
Further, a second diode D2 and a third diode D3 are also included;
the collector of the transistor Q1 is connected to the switch enable terminal PWR _ EN of the switch circuit by connecting the second diode D2 in reverse, and the first pin of the terminal block J1 is connected to the switch enable terminal PWR _ EN of the switch circuit by connecting the third diode D3 in reverse.
As can be seen from the above description, the second diode D2 and the third diode D3 both function as an anti-reverse connection, and are not conductive when subjected to a reverse voltage, so as to protect other electronic components.
Further, a sixth capacitor C6 is also included;
one end of the sixth capacitor C6 is connected to the collector of the transistor Q1, and the other end of the sixth capacitor C6 is grounded.
As can be seen from the above description, the sixth capacitor C6 acts as a filter capacitor, and can improve the anti-interference capability of the circuit.
Referring to fig. 1 and fig. 2, a first embodiment of the present invention is:
a power switch control circuit is shown in fig. 1 and comprises a power supply DC, a switch circuit, a wire holder J1, a switch piece, a main control chip U1, a first resistor R1, a triode Q1, a second resistor R2, a first diode D1, an external power supply V1, a third resistor R3, a fourth resistor R4, a second diode D2 and a third diode D3. The first pin and the second pin of the wire holder J1 are connected through a switch, and the first pin of the wire holder J1 is connected with the switch enable terminal PWR _ EN of the switch circuit. The first serial input/output port of the main control chip U1 is connected to one end of a first resistor R1, the other end of the first resistor R1 is connected to one end of a second resistor R2 and the base of a transistor Q1, and the collector of the transistor Q1 is connected to the switch enable terminal PWR _ EN of the switch circuit. The power supply DC is connected with the signal input end of the switch circuit, and the signal output end of the switch circuit is used for being connected with the power supply end of the electronic equipment.
The second pin of the wire holder J1, the emitter of the transistor Q1, and the other end of the second resistor R2 are all grounded, the transistor Q1 is an NPN-type transistor Q1, and the switching circuit is turned on when the switch enable terminal PWR _ EN is at a low level.
In this embodiment, as shown in fig. 1 and fig. 2, the power switch control circuit includes the following two control modes:
first, when the switch member is closed, the first and second pins of the wire holder J1 are turned on. At this time, the switch enable terminal PWR _ EN of the switch circuit is set low, i.e. the switch circuit is turned on; the power supply DC supplies power to the electronic device. This is suitable for use with some switch members similar to a boat-type switch, i.e., the switch member maintains the closed state when it is shifted to the closed state, thereby maintaining the power supply of the electronic device.
Second, when the switch member is closed, the first and second pins of the wire holder J1 are turned on. The power supply DC supplies power to the electronic device. The master control chip U1 is also powered. After that, the main control chip U1 outputs a high level through the first serial input/output port, so that the transistor Q1 is turned on, and the switch enable terminal PWR _ EN of the switch circuit is also set to be low. This method is applicable to some switch elements like tact switches, which rely on the output of the master control chip U1 to maintain power after reset. Therefore, the switch element only needs to be closed once for a short time, and the purpose of awakening the main control chip U1 is achieved. In addition, in this embodiment, the cathode of the first diode D1 is connected to the first pin of the wire holder J1, the anode of the first diode D1 is connected to one end of the third resistor R3 and one end of the fourth resistor R4, the other end of the third resistor R3 is connected to the external power source V1, and the other end of the fourth resistor R4 is connected to the second serial input/output port of the main control chip U1. The main control chip U1 detects the level change at the junction of the first diode D1 and the third resistor R3 through the second serial input/output port to determine whether the current switch is closed, that is, whether the electronic device needs to be powered on, thereby cooperatively realizing the power supply and the power on of the electronic device.
Thus, the power switch control circuit of the present invention can be applied to two types of switching devices. When a user uses the electronic equipment with the novel power switch control circuit, different switch pieces can be selected according to the requirements of the user.
In this embodiment, as shown in fig. 1, the collector of the transistor Q1 is connected to the switch enable terminal PWR _ EN of the switch circuit through the second diode D2, and the first pin of the terminal J1 is connected to the switch enable terminal PWR _ EN of the switch circuit through the third diode D3. The second diode D2 and the third diode D3 both function as reverse connection prevention, and are not conducted when the reverse voltage is applied to them, so as to protect other electronic components.
Referring to fig. 2, the second embodiment of the present invention is:
based on the first embodiment, as shown in fig. 2, the switch circuit includes a MOS transistor T1, a fifth resistor R5, a sixth resistor R6, a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, an electrolytic capacitor CP, a seventh resistor R7, a transient suppression diode TVS, a second diode D2, a third diode D3, and a power interface J2. One end of the fifth resistor R5 is a switch enable end PWR _ EN of the switch circuit, the other end of the fifth resistor R5 is connected to one end of the first capacitor C1, one end of the sixth resistor R6 and the gate of the MOS transistor T1, the other end of the first capacitor C1 is connected to the positive output end of the power supply DC, one end of the second capacitor C2, the other end of the sixth resistor R6, one end of the third capacitor C3 and the source of the MOS transistor T1, and the drain of the MOS transistor T1 is used for connecting the power supply end of the electronic device. The other end of the second capacitor C2 and the other end of the third capacitor C3 are both grounded. And, the power supply DC is connected to the signal input terminal of the switching circuit through the power interface J2. Specifically, the MOS transistor T1 adopts a device model of SI4435BDY, and in other equivalent embodiments, other models of P-channel MOS transistor T1 can also be used.
In the present embodiment, as shown in fig. 2, the cathode of the transient suppression diode TVS is connected to the source of the MOS transistor T1, and the anode of the transient suppression diode TVS is grounded. The transient suppression diode TVS can prevent other devices in the circuit from receiving the influence of instantaneous pulses, and plays a role in protection.
In the present embodiment, as shown in fig. 2, one end of the fourth capacitor C4 is connected to the source of the MOS transistor T1, and the other end of the fourth capacitor C4 is grounded. One end of the sixth capacitor C6 is connected to the collector of the transistor Q1, and the other end of the sixth capacitor C6 is grounded. The fourth capacitor C4 and the sixth capacitor C6 are both filter capacitors, and are used for stabilizing the power supply output of the power supply DC.
In addition, in the present embodiment, as shown in fig. 2, the drain of the MOS transistor T1 is connected to one end of the fifth capacitor C5, the anode of the electrolytic capacitor CP and one end of the seventh resistor R7, and the other end of the fifth capacitor C5, the cathode of the electrolytic capacitor CP and the other end of the seventh resistor R7 are all grounded. The electrolytic capacitor CP and the seventh resistor R7 form a resistance-capacitance filter network, and filter the drain output of the MOS transistor T1 to obtain a stable power supply output and use the power supply output for the electronic device.
In summary, the utility model discloses a power switch control circuit, when a switch piece is a switch similar to a ship-shaped switch, a first wiring pin and a second wiring pin of a wiring holder are conducted by toggling a switch, so that the level of a switch enabling end of a switch circuit is lowered, the switch circuit which takes an MOS transistor as a main switch device is conducted, and the electronic equipment supplies power normally; when the switch spare is for being similar to the switch of dabbing the button, after the switch spare is pressed, the first series input/output port output high level of usable main control chip, switch on the triode, thereby make the level of switch enable end of switch circuit put down, the switch circuit switch-on, electronic equipment normally supplies power, high durability and convenient use, devices such as transient state diode and filter capacitor have still been add in the circuit, guarantee circuit safety and stability moves, it can insert the switch spare of different kinds to control to have realized same switch control circuit, can satisfy user's different demands.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent modifications made by the contents of the present specification and the drawings, or applied to the related technical fields directly or indirectly, are included in the scope of the present invention.
Claims (9)
1. A power switch control circuit is characterized by comprising a power supply, a switch circuit, a wire holder, a switch piece, a main control chip, a first resistor, a triode and a second resistor;
the first pin and the second pin of the wire holder are connected through the switch piece, and the first pin of the wire holder is connected with the switch enabling end of the switch circuit;
a first serial input/output port of the main control chip is connected with one end of the first resistor, the other end of the first resistor is simultaneously connected with one end of the second resistor and the base electrode of the triode, and the collector electrode of the triode is connected with the switch enabling end of the switch circuit;
the power supply is connected with the signal input end of the switch circuit, and the signal output end of the switch circuit is used for connecting the power supply end of the electronic equipment;
the second pin of the wire holder, the emitting electrode of the triode and the other end of the second resistor are all grounded, the triode is an NPN type triode, and the switch circuit is conducted when the switch enabling end is at a low level.
2. The power switch control circuit of claim 1, further comprising a first diode, an external power source, a third resistor, and a fourth resistor;
the negative electrode of the first diode is connected with the first pin of the wire holder, the positive electrode of the first diode is simultaneously connected with one end of the third resistor and one end of the fourth resistor, the other end of the third resistor is connected with the external power supply, and the other end of the fourth resistor is connected with the second serial input/output port of the main control chip.
3. The power switch control circuit according to claim 1, wherein the switch circuit comprises a MOS transistor, a fifth resistor, a sixth resistor, a first capacitor, a second capacitor and a third capacitor;
one end of the fifth resistor is a switch enabling end of the switch circuit, the other end of the fifth resistor is simultaneously connected with one end of the first capacitor, one end of the sixth resistor and the grid electrode of the MOS tube, the other end of the first capacitor is simultaneously connected with the anode output end of the power supply, one end of the second capacitor, the other end of the sixth resistor, one end of the third capacitor and the source electrode of the MOS tube, and the drain electrode of the MOS tube is used for connecting the power supply end of the electronic equipment;
the other end of the second capacitor and the other end of the third capacitor are both grounded, and the MOS tube is a P-channel MOS tube.
4. A power switch control circuit as claimed in claim 3, wherein the switching circuit further comprises a transient suppression diode;
the cathode of the transient suppression diode is connected with the source electrode of the MOS tube, and the anode of the transient suppression diode is grounded.
5. A power switch control circuit as claimed in claim 3, wherein the switch circuit further comprises a fourth capacitor;
one end of the fourth capacitor is connected with the source electrode of the MOS tube, and the other end of the fourth capacitor is grounded.
6. The power switch control circuit of claim 3, wherein the switching circuit further comprises a fifth capacitor, an electrolytic capacitor, and a seventh resistor;
and the drain electrode of the MOS tube is simultaneously connected with one end of the fifth capacitor, the anode of the electrolytic capacitor and one end of the seventh resistor, and the other end of the fifth capacitor, the cathode of the electrolytic capacitor and the other end of the seventh resistor are all grounded.
7. The power switch control circuit of claim 1, further comprising a power interface;
and the power supply is connected with the signal input end of the switch circuit through the power interface.
8. A power switch control circuit as claimed in claim 1, further comprising a second diode and a third diode;
and the collector of the triode is connected with the switch enabling end of the switch circuit through the reverse connection of the second diode, and the first pin of the wire holder is connected with the switch enabling end of the switch circuit through the reverse connection of the third diode.
9. The power switch control circuit of claim 1, further comprising a sixth capacitor;
one end of the sixth capacitor is connected with the collector of the triode, and the other end of the sixth capacitor is grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121356412.0U CN215818084U (en) | 2021-06-18 | 2021-06-18 | Power switch control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121356412.0U CN215818084U (en) | 2021-06-18 | 2021-06-18 | Power switch control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215818084U true CN215818084U (en) | 2022-02-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121356412.0U Active CN215818084U (en) | 2021-06-18 | 2021-06-18 | Power switch control circuit |
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| Country | Link |
|---|---|
| CN (1) | CN215818084U (en) |
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2021
- 2021-06-18 CN CN202121356412.0U patent/CN215818084U/en active Active
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