CN219609501U - Voltage stabilizing control regulating circuit - Google Patents
Voltage stabilizing control regulating circuit Download PDFInfo
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- CN219609501U CN219609501U CN202223090619.5U CN202223090619U CN219609501U CN 219609501 U CN219609501 U CN 219609501U CN 202223090619 U CN202223090619 U CN 202223090619U CN 219609501 U CN219609501 U CN 219609501U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Control Of Voltage And Current In General (AREA)
- Continuous-Control Power Sources That Use Transistors (AREA)
Abstract
The utility model discloses a voltage stabilizing control regulating circuit, which relates to the technical field of power supply regulation and comprises an input protection module, a control module and a control module, wherein the input protection module is used for instantaneous voltage overvoltage protection and controlling the input of a power supply; the voltage stabilizing driving module is used for adjusting the output voltage stabilizing value; the output module is used for carrying out output filtering treatment; the output sampling adjusting module is used for sampling voltage and adjusting the sampled voltage value; the voltage feedback module is used for adjusting the sampling voltage value; and the overvoltage detection control module is used for detecting overvoltage and controlling the input protection module to work. The voltage stabilizing control regulating circuit disclosed by the utility model is used for protecting the overvoltage and transient voltage of the input electric energy, the voltage stabilizing driving module is matched with the voltage feedback module and the output sampling regulating module to finish voltage stabilizing output and voltage stabilizing regulating control, the voltage feedback module is used for further changing the sampled voltage value so as to be convenient for the voltage stabilizing driving module to receive and regulate the output voltage stabilizing value, and meanwhile, when the output voltage exceeds a voltage threshold value, the input protecting module is controlled to carry out protecting work.
Description
Technical Field
The utility model relates to the technical field of power supply regulation, in particular to a voltage stabilizing control regulating circuit.
Background
With the progress and development of social science and technology, the portable electronic device has an increasing demand for a power management chip, and for a power supply, low power consumption and high conversion efficiency are required in addition to stable low-noise and adjustable voltage, and high safety is required to ensure stable operation of the electronic device, and at present, most of power management schemes adopt a switching power supply, a charge pump, a linear voltage regulator and other modes to complete voltage stabilization supply and regulation, but since the output voltage regulation precision is affected by a resistor matching network, the voltage regulation precision is poor, and compared with the switching power supply, a hardware circuit is relatively complex, and effective overvoltage and transient voltage protection cannot be performed on the power supply, so that improvement is required.
Disclosure of Invention
The embodiment of the utility model provides a voltage stabilizing control and regulation circuit to solve the problems in the background technology.
According to an embodiment of the present utility model, there is provided a voltage regulation control and adjustment circuit including: the device comprises a power supply module, an input protection module, a voltage stabilizing driving module, an output sampling and adjusting module, a voltage feedback module and an overvoltage detection control module;
the power supply module is used for carrying out voltage reduction, rectification and filtering treatment on the input electric energy;
the input protection module is connected with the power supply module and used for detecting the electric energy voltage output by the power supply module and performing instantaneous voltage protection and overvoltage protection control;
the voltage stabilizing driving module is connected with the input protection module and the voltage feedback module and is used for receiving the electric energy output by the power supply module and stabilizing the voltage and outputting the electric energy, and is used for receiving the voltage output by the voltage feedback module and regulating the output voltage;
the output module is connected with the voltage stabilizing driving module and is used for filtering the voltage output by the voltage stabilizing driving module;
the output sampling adjustment module is connected with the output module and used for sampling the voltage output by the output module through a sampling resistor and adjusting the output sampling voltage value;
the voltage feedback module is connected with the output sampling adjustment module and is used for receiving the sampling voltage value output by the output sampling adjustment module, changing the sampling voltage value through the operational amplification circuit and transmitting the sampling voltage value to the voltage stabilizing driving module;
the overvoltage detection control module is connected with the voltage feedback module and the input protection module, and is used for receiving the voltage output by the voltage feedback module and comparing the voltage with a set voltage threshold value, and controlling the input protection module to perform output overvoltage protection work.
Compared with the prior art, the utility model has the beneficial effects that: the voltage stabilizing control and regulating circuit adopts the input protection module to carry out overvoltage and transient voltage protection on the input voltage stabilizing driving module, ensures that the voltage stabilizing driving module is in a safe voltage environment, and is matched with the voltage feedback module and the output sampling and regulating module to finish voltage stabilizing output control, meanwhile, the output sampling and regulating module can change the sampled voltage value by regulating the resistance value of the sampling resistor, the voltage feedback module further changes the sampled voltage value so as to be convenient for the voltage stabilizing driving module to receive and regulate the output voltage stabilizing value, the precision of output voltage stabilization is improved, and meanwhile, when the voltage output by the voltage feedback module exceeds a set voltage threshold, the input protection module is controlled to work as well, the power supply to the voltage stabilizing driving module is stopped, the safety of the circuit is improved, and the whole circuit is simple and feasible and has low cost.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the description of the embodiments of the present utility model will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic block diagram of a voltage stabilizing control and regulation circuit according to an embodiment of the present utility model.
Fig. 2 is a circuit diagram of a voltage stabilizing control adjusting circuit provided by the embodiment of the utility model.
Fig. 3 is a circuit diagram of a connection of an overvoltage detection control module according to an embodiment of the present utility model.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
Referring to fig. 1, in embodiment 1, a voltage stabilizing control adjusting circuit includes: the device comprises a power supply module 1, an input protection module 2, a voltage stabilizing driving module 3, an output module 4, an output sampling adjustment module 5, a voltage feedback module 6 and an overvoltage detection control module 7;
specifically, the power module 1 is configured to perform voltage reduction, rectification and filtering on input electric energy;
the input protection module 2 is connected with the power module 1 and is used for detecting the electric energy voltage output by the power module 1 and performing instantaneous voltage protection and overvoltage protection control;
the voltage stabilizing driving module 3 is connected with the input protection module 2 and the voltage feedback module 6, and is used for receiving the electric energy output by the power supply module 1 and performing voltage stabilizing output, and is used for receiving the voltage output by the voltage feedback module 6 and adjusting the output voltage stabilizing;
the output module 4 is connected with the voltage stabilizing driving module 3 and is used for filtering the voltage output by the voltage stabilizing driving module 3;
the output sampling adjustment module 5 is connected with the output module 4 and is used for sampling the voltage output by the output module 4 through a sampling resistor and adjusting the output sampling voltage value;
the voltage feedback module 6 is connected with the output sampling adjustment module 5 and is used for receiving the sampling voltage value output by the output sampling adjustment module 5, changing the sampling voltage value through an operational amplification circuit and transmitting the sampling voltage value to the voltage stabilizing driving module 3;
and the overvoltage detection control module 7 is connected with the voltage feedback module 6 and the input protection module 2, and is used for receiving the voltage output by the voltage feedback module 6 and comparing the voltage with a set voltage threshold value, and controlling the input protection module 2 to perform output overvoltage protection work.
In a specific embodiment, the power module 1 may use an AC power source AC, a transformer W, a rectifier T, and filter capacitors C1 and C2 to perform decompression, rectification, filtering, and filtering processing on the AC power source, which will not be described herein.
In this embodiment, referring to fig. 2 and 3, the input protection module 2 includes a first switching tube VT1, a first resistor R1, a second resistor R2, a first voltage stabilizing tube VD1, a second voltage stabilizing tube VD2, a first potentiometer RP1, and a first power tube Q1;
specifically, the collector of the first switching tube VT1 and one end of the first potentiometer RP1 are both connected to the power module 1, the base of the first switching tube VT1 is connected to the anode of the second voltage stabilizing tube VD2, the cathode of the second voltage stabilizing tube VD2 is connected to the other end and the sliding end of the first potentiometer RP1, the emitter of the first switching tube VT1 is connected to one end of the second resistor R2, the cathode of the first voltage stabilizing tube VD1 and the gate of the first power tube Q1 through the first resistor R1, the drain of the first power tube Q1 is connected to the other end of the second resistor R2, the anode of the first voltage stabilizing tube VD1 and the power module 1, and the source of the first power tube Q1 is connected to the voltage stabilizing driving module 3.
In a specific embodiment, the first switching transistor VT1 may be an NPN transistor; the first power tube Q1 may be a P-channel enhancement type MOS tube, and the first power tube Q1 is continuously in a conductive state due to the connection of the second resistor R2 to the ground.
Further, the voltage stabilizing driving module 3 includes a first voltage stabilizer U1, a second diode D2, a first inductor L1, and a third capacitor C3;
specifically, the input end and the control end of the first voltage stabilizer U1 are both connected to the collector of the first switching tube VT1, the feedback end of the first voltage stabilizer U1 is connected to the voltage feedback module 6, the ground end of the first voltage stabilizer U1 is connected to the anode of the second diode D2, one end of the third capacitor C3 and the ground end, the cathode of the second diode D2 is connected to the output end of the first voltage stabilizer U1 and the first end of the first inductor L1, and the second end of the first inductor L1 is connected to the other end of the third capacitor C3 and the output module 4.
In a specific embodiment, the first voltage stabilizer U1 may be an LM2596 chip; the first inductor L1 and the third capacitor C3 form an LC filter circuit.
Further, the output module 4 includes a second inductor L2, a fourth capacitor C4, a fifth capacitor C5, and an output port;
specifically, the first end of the second inductor L2 is connected to the output sampling adjustment module 5, one end of the fourth capacitor C4, and the second end of the first inductor L1, the second end of the second capacitor is connected to the output port and to the ground through the fifth capacitor C5, and the other end of the fourth capacitor C4 is connected to the ground.
In a specific embodiment, the second inductor L2, the fourth capacitor C4, and the fifth capacitor C5 form a CLC filter circuit.
Further, the output sampling adjustment module 5 includes a third resistor R3, a second potentiometer RP2, and a fourth resistor R4;
specifically, the first end of the third resistor R3 is connected to the second end of the first inductor L1, the second end of the third resistor R3 is connected to one end of the second potentiometer RP2 and the slide end, the other end of the second potentiometer RP2 is connected to the first end of the fourth resistor R4, and the second end of the fourth resistor R4 is connected to the ground.
In a specific embodiment, the third resistor R3, the second potentiometer RP2 and the fourth resistor R4 form a resistor divider circuit, wherein the resistance of the second potentiometer RP2 is adjusted, and the resistance of the sampling resistor can be adjusted.
Further, the voltage feedback module 6 includes a fifth resistor R5, a sixth resistor R6, a first operational amplifier OP1, a seventh resistor R7, a second operational amplifier OP2, an eighth resistor R8, a ninth resistor R9, a third operational amplifier OP3, a tenth resistor R10, a first diode D1, a first power source VCC1, and a second power source VCC2;
specifically, one end of the fifth resistor R5 and one end of the sixth resistor R6 are respectively connected to the second end of the third resistor R3 and the first end of the fourth resistor R4, the other end of the fifth resistor R5 and the other end of the sixth resistor R6 are respectively connected to the in-phase end and the opposite-phase end of the first operational amplifier OP1, the output end of the first operational amplifier OP1 is connected to one end of the eighth resistor R8 and the opposite-phase end of the second operational amplifier OP2 through the seventh resistor R7, the in-phase end of the second operational amplifier OP2 and the in-phase end of the third operational amplifier OP3 are grounded, the other end of the eighth resistor R8 is connected to the output end of the second operational amplifier OP2 and one end of the tenth resistor R10 through the ninth resistor R9, the other end of the tenth resistor R10 is connected to the output end of the third operational amplifier OP3, the anode of the first diode D1 and the overvoltage detection control module 7, the first power end of the first operational amplifier OP1, the first power end of the second operational amplifier OP2 and the first power supply end of the first operational amplifier OP2 and the second power supply end of the first diode D1 are connected to the first power supply of the first operational amplifier OP1, and the second power supply end of the second power supply of the second operational amplifier OP2 is connected to the first power supply end of the first diode v 1, and the first power supply of the second power supply of the first power supply and the second power supply of the first power supply end of the first power supply is connected to the first power supply of the first power supply and the second power supply end of the power supply is connected to the first power supply end of the power supply 2 and the power supply end of the power supply bridge is connected to the power supply to the power bridge.
In a specific embodiment, the first OP1 may be an AD622 instrumentation amplifier; the second operational amplifier OP2 and the third operational amplifier OP3 may be AD826 two-way operational amplifiers.
Further, the overvoltage detection control module 7 includes a first comparator A1, an eleventh resistor R11, a twelfth resistor R12, a voltage regulator U2, a thirteenth resistor R13, a third power VCC3, a fourteenth resistor R14, a fifteenth resistor R15, and a third diode D3;
specifically, the in-phase end of the first comparator A1 is connected to the output end of the third operational amplifier OP3, the inverting end of the first comparator A1 is connected to one end of the thirteenth resistor R13 and the cathode of the voltage regulator U2, and is connected to the control end of the voltage regulator U2 and one end of the eleventh resistor R11 through the twelfth resistor R12, the second end of the eleventh resistor R11 and the anode of the voltage regulator U2 are both grounded, the other end of the thirteenth resistor R13 is connected to the third power VCC3, and is connected to the output end of the first comparator A1 and one end of the fifteenth resistor R15 through the fourteenth resistor R14, the other end of the fifteenth resistor R15 is connected to the anode of the third diode D3, and the cathode of the third diode D3 is connected to the gate of the first power tube Q1.
In a specific embodiment, the first comparator A1 may be an LM393 comparator; the eleventh resistor R11, the twelfth resistor R12, the voltage regulator U2, the thirteenth resistor R13, and the third power supply VCC3 form a voltage threshold, which is used as an overvoltage threshold comparison limit; the voltage regulator U2 may be a TL431 chip.
According to the voltage stabilizing control regulating circuit, a power supply module 1 provides required electric energy, an input protection module 2 detects the input electric energy, when overvoltage or transient voltage occurs, a second voltage stabilizing tube VD2 breaks down, so that a first switch tube VT1 is conducted, a first power tube Q1 is cut off, the input of the power supply module 1 is stopped, when the output of the power supply module 1 is normal, the first voltage stabilizer U1 carries out voltage stabilizing output, meanwhile, an output sampling regulating module 5 samples the voltage output by the first voltage stabilizer U1, the voltage is regulated to a feedback module by the voltage, so that the feedback end of the first voltage stabilizer U1 receives the sampled voltage, the output voltage stabilizing value is regulated, meanwhile, the voltage stabilizing value output by the first voltage stabilizer U1 can be changed by regulating the resistance value of a second potentiometer RP2, and when the feedback voltage value output by a third operational amplifier OP3 exceeds the voltage threshold value input by an eleventh resistor R11, a twelfth resistor R12, the voltage stabilizing device U2 and a thirteenth resistor R13, and when the voltage input by the third power supply 3 is threshold value, the first voltage VCC1 controls the first power tube Q1 to stop supplying the power supply.
The voltage stabilizing control and regulation circuit adopts the input protection module 2 to carry out overvoltage and transient voltage protection on the input voltage stabilizing driving module 3, ensures that the voltage stabilizing driving module 3 is in a safe voltage environment, is matched with the voltage feedback module 6 and the output sampling and regulation module 5 to finish voltage stabilizing output control, can simultaneously change the sampled voltage value by the output sampling and regulation module 5 through regulating the resistance value of the sampling resistor, the voltage feedback module 6 further changes the sampled voltage value so as to be received by the voltage stabilizing driving module 3 and regulate the output voltage stabilizing value, the precision of output voltage stabilizing is improved, and meanwhile, when the voltage output by the voltage feedback module 6 exceeds a set voltage threshold value, the input protection module 2 is controlled to work, the power supply to the voltage stabilizing driving module 3 is stopped, the safety of the circuit is improved, and the whole circuit is simple and easy to operate and low in cost.
It will be evident to those skilled in the art that the utility model is not limited to the details of the foregoing illustrative embodiments, and that the present utility model may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.
Claims (7)
1. A voltage stabilizing control regulating circuit is characterized in that,
the voltage stabilizing control regulating circuit comprises: the device comprises a power supply module, an input protection module, a voltage stabilizing driving module, an output sampling and adjusting module, a voltage feedback module and an overvoltage detection control module;
the power supply module is used for carrying out voltage reduction, rectification and filtering treatment on the input electric energy;
the input protection module is connected with the power supply module and used for detecting the electric energy voltage output by the power supply module and performing instantaneous voltage protection and overvoltage protection control;
the voltage stabilizing driving module is connected with the input protection module and the voltage feedback module and is used for receiving the electric energy output by the power supply module and stabilizing the voltage and outputting the electric energy, and is used for receiving the voltage output by the voltage feedback module and regulating the output voltage;
the output module is connected with the voltage stabilizing driving module and is used for filtering the voltage output by the voltage stabilizing driving module;
the output sampling adjustment module is connected with the output module and used for sampling the voltage output by the output module through a sampling resistor and adjusting the output sampling voltage value;
the voltage feedback module is connected with the output sampling adjustment module and is used for receiving the sampling voltage value output by the output sampling adjustment module, changing the sampling voltage value through the operational amplification circuit and transmitting the sampling voltage value to the voltage stabilizing driving module;
the overvoltage detection control module is connected with the voltage feedback module and the input protection module, and is used for receiving the voltage output by the voltage feedback module and comparing the voltage with a set voltage threshold value, and controlling the input protection module to perform output overvoltage protection work.
2. The voltage stabilizing control regulating circuit according to claim 1, wherein the input protection module comprises a first switch tube, a first resistor, a second resistor, a first voltage stabilizing tube, a second voltage stabilizing tube, a first potentiometer, and a first power tube;
the power supply module is connected to the collecting electrode of the first switching tube and one end of the first potentiometer, the anode of the second voltage stabilizing tube is connected to the base electrode of the first switching tube, the other end and the sliding end of the first potentiometer are connected to the cathode of the second voltage stabilizing tube, one end of the second resistor, the cathode of the first voltage stabilizing tube and the grid electrode of the first power tube are connected to the emitting electrode of the first switching tube through the first resistor, the other end of the second resistor, the anode of the first voltage stabilizing tube and the power supply module are connected to the drain electrode of the first power tube, and the voltage stabilizing driving module is connected to the source electrode of the first power tube.
3. The voltage stabilizing control regulating circuit according to claim 2, wherein the voltage stabilizing driving module comprises a first voltage stabilizer, a second diode, a first inductor and a third capacitor;
the input end and the control end of the first voltage stabilizer are both connected with the collector electrode of the first switching tube, the feedback end of the first voltage stabilizer is connected with the voltage feedback module, the grounding end of the first voltage stabilizer is connected with the anode of the second diode, one end of the third capacitor and the grounding end, the cathode of the second diode is connected with the output end of the first voltage stabilizer and the first end of the first inductor, and the second end of the first inductor is connected with the other end of the third capacitor and the output module.
4. The regulator circuit of claim 3, wherein the output module comprises a second inductor, a fourth capacitor, a fifth capacitor, and an output port;
the first end of the second inductor is connected with the output sampling adjusting module, one end of the fourth capacitor and the second end of the first inductor, the second end of the second capacitor is connected with the output port and the ground end through the fifth capacitor, and the other end of the fourth capacitor is connected with the ground end.
5. The voltage stabilizing control regulating circuit according to claim 3, wherein said output sampling regulating module comprises a third resistor, a second potentiometer, and a fourth resistor;
the first end of the third resistor is connected with the second end of the first inductor, the second end of the third resistor is connected with one end of the second potentiometer and the sliding vane end, the other end of the second potentiometer is connected with the first end of the fourth resistor, and the second end of the fourth resistor is connected with the ground end.
6. The voltage stabilizing control regulating circuit according to claim 5, wherein the voltage feedback module comprises a fifth resistor, a sixth resistor, a first operational amplifier, a seventh resistor, a second operational amplifier, an eighth resistor, a ninth resistor, a third operational amplifier, a tenth resistor, a first diode, a first power supply, and a second power supply;
one end of the fifth resistor and one end of the sixth resistor are respectively connected with the second end of the third resistor and the first end of the fourth resistor, the other end of the fifth resistor and the other end of the sixth resistor are respectively connected with the in-phase end and the opposite-phase end of the first operational amplifier, the output end of the first operational amplifier is connected with the one end of the eighth resistor and the opposite-phase end of the second operational amplifier through the seventh resistor, the in-phase end of the second operational amplifier and the in-phase end of the third operational amplifier are grounded, the other end of the eighth resistor is connected with the output end of the second operational amplifier and the opposite-phase end of the tenth resistor through the ninth resistor, the other end of the tenth resistor is connected with the output end of the third operational amplifier, the anode of the first diode and the overvoltage detection control module, the first power end of the first operational amplifier, the first power end of the second operational amplifier and the first power end of the third operational amplifier are all connected with the first power supply, the second power end of the second operational amplifier and the second power end of the third operational amplifier are all connected with the second power supply, and the second power end of the second stable-phase end of the second operational amplifier is connected with the first diode and the second power supply.
7. The regulator control circuit of claim 6, wherein the overvoltage detection control module comprises a first comparator, an eleventh resistor, a twelfth resistor, a voltage regulator, a thirteenth resistor, a third power supply, a fourteenth resistor, a fifteenth resistor, and a third diode;
the non-inverting terminal of the first comparator is connected with the output terminal of the third operational amplifier, the inverting terminal of the first comparator is connected with one end of the thirteenth resistor and the cathode of the voltage stabilizing regulator and is connected with the control terminal of the voltage stabilizing regulator and one end of the eleventh resistor through the twelfth resistor, the second end of the eleventh resistor and the anode of the voltage stabilizing regulator are both grounded, the other end of the thirteenth resistor is connected with a third power supply and is connected with the output terminal of the first comparator and one end of the fifteenth resistor through the fourteenth resistor, the other end of the fifteenth resistor is connected with the anode of the third diode, and the cathode of the third diode is connected with the grid electrode of the first power tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223090619.5U CN219609501U (en) | 2022-11-17 | 2022-11-17 | Voltage stabilizing control regulating circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223090619.5U CN219609501U (en) | 2022-11-17 | 2022-11-17 | Voltage stabilizing control regulating circuit |
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| Publication Number | Publication Date |
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| CN219609501U true CN219609501U (en) | 2023-08-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202223090619.5U Active CN219609501U (en) | 2022-11-17 | 2022-11-17 | Voltage stabilizing control regulating circuit |
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| CN (1) | CN219609501U (en) |
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- 2022-11-17 CN CN202223090619.5U patent/CN219609501U/en active Active
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