CN217010900U - Signal switch for electric power infrastructure - Google Patents
Signal switch for electric power infrastructure Download PDFInfo
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- CN217010900U CN217010900U CN202220694998.XU CN202220694998U CN217010900U CN 217010900 U CN217010900 U CN 217010900U CN 202220694998 U CN202220694998 U CN 202220694998U CN 217010900 U CN217010900 U CN 217010900U
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Abstract
The utility model discloses a signal switch for electric power infrastructure, which comprises a signal receiving and transmitting circuit, a rectifying circuit, a detection circuit, a signal amplifying circuit, an overvoltage protection circuit, a signal feedback circuit and a processor chip, wherein the signal receiving and transmitting circuit generates resonance waves after receiving radio-frequency signals identified by PDA equipment; the resonance wave is rectified by a rectifying circuit and then input to a detection circuit and an overvoltage protection circuit; the overvoltage protection circuit outputs a direct current power supply to supply power for the signal amplification circuit; the rectified resonance wave is output by the detection circuit to detect signals, amplified by the signal amplifying circuit and input to the processor chip, and the feedback signals output by the processor chip are processed by the signal feedback circuit and fed back to the PDA device by the signal transceiver circuit. The utility model meets the use requirements of PDA radio frequency signal identification scenes in electric power infrastructure on the signal switch with simple circuit structure, low price and low failure rate.
Description
Technical Field
The utility model relates to the technical field of signal exchange, in particular to a signal exchanger for electric power infrastructure.
Background
In the electric power capital construction project, the RFID technology is often used to realize the fine management of each engineering personnel and the project progress of the construction site, and the principle is as follows: after a constructor receives a construction task issued through an intelligent terminal, for example, after a constructor receives a construction task of the constructor on the same day and installs a transformer in an area A of a construction site, the constructor starts to execute the task, the PDA device is held by hands to scan an RFID label attached to the transformer, a radio frequency identification signal is generated and sent to a signal switch, the signal switch adjusts the received radio frequency signal, then a feedback signal is generated and sent to a corresponding PDA device to complete signal interaction with the PDA device, for example, the switch successfully receives the radio frequency signal sent by the PDA device and then carries out signal feedback, the PDA device receives the feedback signal and then an indicator lamp lights a green lamp to prompt the code scanning person that the information interaction is successful.
At present, a signal switch purchased and used in an electric power infrastructure project, such as an optical wireless signal switch, has a complex internal circuit structure and a high selling price, most functions cannot be used in the scene, and waste is caused.
SUMMERY OF THE UTILITY MODEL
The utility model provides a signal switch for electric power infrastructure, aiming at meeting the use requirements of a PDA radio frequency signal identification scene in the electric power infrastructure on the signal switch with a simple circuit structure, a low selling price and a low failure rate.
In order to achieve the purpose, the utility model adopts the following technical scheme:
the signal switch for the electric power infrastructure is used for exchanging signals with PDA equipment held by constructors and storing received radio frequency identification signals to the cloud by using a block chain technology, the PDA equipment is used for scanning RFID tag information attached to the electric power equipment, the signal switch comprises a signal receiving and transmitting circuit, a rectifying circuit, a detection circuit, a signal amplifying circuit, an overvoltage protection circuit, a signal feedback circuit and a processor chip, and the signal receiving and transmitting circuit generates resonance waves after receiving the radio frequency signals identified by the PDA equipment; the resonance wave is rectified by the rectifying circuit and then is respectively input to the detection circuit and the overvoltage protection circuit; the overvoltage protection circuit outputs a direct current power supply to supply power for the signal amplification circuit; the rectified resonance wave is detected by the detection circuit and then outputs a detection signal, the detection signal is amplified by the signal amplifying circuit and then is input to the processor chip,
when the processor chip needs to feed back signals to the PDA device, the feedback signals output by the processor chip are subjected to signal processing by the signal feedback circuit and then fed back to the PDA device by the signal transceiver circuit.
Preferably, the signal transceiver circuit is a parallel LC resonant circuit.
Preferably, the rectifier circuit is a bridge rectifier circuit including diodes D1, D2, D3, and D4, and the signal transceiver circuit is constituted by parallel LC resonant circuits, one end of each of which is connected to an intersection between the diodes D1 and D2, and the other end of each of which is connected to an intersection between the diodes D3 and D4.
Preferably, the detector circuit includes a capacitor C3, a resistor R8 and a capacitor C4 which are connected in parallel, one end of the resistor R8 and one end of the capacitor C4 which are connected in parallel are connected to an intersection between the diodes D2 and D3 in the bridge rectifier circuit and are connected to one end of the capacitor C3, the other end of the capacitor C3 is connected to a non-inverting input terminal of an amplifier U1 in the signal amplifier circuit, and the other end of the resistor R8 and the other end of the capacitor C4 which are connected in parallel are grounded.
Preferably, the signal amplification circuit includes an amplifier U1, capacitors C4, C5, resistors R7, R9, and R10, an inverting input terminal of the amplifier U1 is connected in series with the resistor R9 and then grounded, and is connected in series with the resistor R7 and the resistor R10 in sequence and then connected to a positive power supply input terminal thereof, and the positive power supply input terminal of the amplifier U1 is connected to a positive power supply output terminal of the overvoltage protection circuit; the capacitor C4 is connected between the non-inverting input end and the output end of the amplifier U1; one end of the capacitor C5 is connected with the non-inverting input end of the amplifier U1, and the other end of the capacitor C5 is grounded; the power supply negative input end of the amplifier U1 is connected with the power supply negative output end of the overvoltage protection circuit; the output terminal of the amplifier U1 is connected to the signal input terminal of the processor chip.
Preferably, the overvoltage protection circuit comprises a capacitor C2, resistors R1-R7, MOS transistors Q1 and Q3 and a triode Q2, one end of the capacitor C2 is connected to the intersection point between the diodes D2 and D3 and is connected with the emitter of the triode Q2 and is connected with the source of the MOS transistor Q3, and the other end of the capacitor C2 is grounded; the collector of the triode Q2 is connected in series with the resistor R6 and then is grounded and is connected with the grid of the MOS transistor Q3; the source electrode of the MOS transistor Q3 is connected with the emitter electrode of the triode Q2, and the drain electrode of the MOS transistor Q3 is used as the positive power output end of the overvoltage protection circuit; the resistor R7 is connected between the gate and the source of the MOS transistor Q3;
the resistor R1 and the resistor R2 which are connected in series are connected in parallel at two ends of the capacitor C2; the gate of the MOS transistor Q1 is connected to the intersection point of the resistor R1 and the resistor R2, the drain is grounded, and the source is connected to the emitter of the triode Q2 after being connected in series with the resistor R4 and the resistor R3; one end of the resistor R5 is connected with the intersection point of the resistors R4 and R3, and the other end of the resistor R5 is connected with the base electrode of the triode Q2;
one end of the resistor R6 is connected with the collector of the triode Q2, and the other end of the resistor R6 is used as the power supply negative output end of the overvoltage protection circuit.
Preferably, the signal feedback circuit comprises a MOS transistor Q4, a triode Q5, resistors R11-R15, a capacitor C4 and a schottky diode D5, wherein one end of the resistor R11 is connected to a feedback signal output end of the processor chip, the other end of the resistor R11 is connected to a gate of the MOS transistor Q4, a source of the MOS transistor Q4 is connected in series with the resistor R12 and then grounded, a drain of the MOS transistor Q4 is connected in series with the resistor R13 and then connected to an emitter of the triode Q5, and the schottky diode D5 and the resistor R15 which are connected in series in reverse are connected in series in sequence and then connected to one end of the LC resonant circuit which is connected in parallel;
the collector of the triode Q5 is connected with the other end of the LC resonance circuit which is connected in parallel, the base of the triode Q5 is connected with the emitter of the resistor R14 and the resistor R13 in sequence and then is connected with the positive input end of the Schottky diode D5; the capacitor C4 is connected between the base and emitter of the transistor Q5.
The signal switch for electric power infrastructure provided by the utility model has the advantages of simple internal circuit structure, simple receiving and feedback principles of radio frequency signals of PDA equipment, lower production and manufacturing cost and overvoltage protection function, effectively reduces the failure rate of the signal switch, and meets the use requirements of PDA radio frequency signal identification scenes in electric power infrastructure on the signal switch with simple circuit structure, price and low failure rate.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments of the present invention will be briefly described below. It is obvious that the drawings described below are only some embodiments of the utility model, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
Fig. 1 is a diagram illustrating an internal circuit of a signal switch for power infrastructure according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a communication connection relationship between a signal switch for power infrastructure and the PDA device, the power infrastructure device, the upper computer, and the cloud storage device according to the embodiment of the present invention.
Detailed Description
The technical scheme of the utility model is further explained by the specific implementation mode in combination with the attached drawings.
Wherein the showings are for the purpose of illustration only and not for the purpose of limiting the same, the same is shown by way of illustration only and not in the form of limitation; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "inner", "outer", etc. are used for indicating the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not indicated or implied that the referred device or element must have a specific orientation, be constructed in a specific orientation and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and are not to be construed as limitations of the present patent, and the specific meanings of the terms may be understood by those skilled in the art according to specific situations.
In the description of the present invention, unless otherwise explicitly specified or limited, the term "connected" or the like, if appearing to indicate a connection relationship between the components, is to be understood broadly, for example, as being fixed or detachable or integral; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or may be connected through one or more other components or may be in an interactive relationship with one another. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As shown in fig. 1, the switch provided in this embodiment of the present invention includes a signal transceiver circuit 100, a rectifier circuit 200, a detector circuit 300, a signal amplifier circuit 400, an overvoltage protection circuit 500, a signal feedback circuit 600, and a processor chip 700, where the signal transceiver circuit is capable of receiving a radio frequency identification signal sent by the PDA and generating resonance to generate a resonant wave with a certain oscillation frequency, the resonant wave is rectified by the rectifier circuit and then input to the detector circuit and the overvoltage protection circuit, the overvoltage protection circuit outputs a dc power supply to power the signal amplifier circuit, and the rectified resonant wave is amplitude-detected by the detector circuit, outputs a detector signal, and is signal-amplified by the signal amplifier circuit The input is sent to the processor chip and the output is sent to the microprocessor chip,
when the processor chip needs to feed back signals to the PDA device, the feedback signals output by the processor chip are subjected to signal processing by the signal feedback circuit and then fed back to the PDA device by the signal transceiver circuit.
Specifically, the transceiver circuit 100 is a parallel LC resonant circuit, and is formed by connecting an inductor L1 and a capacitor C1 in parallel as shown in fig. 1. The LC resonant circuit is capable of receiving the RFID signal from the PDA device and generating a resonant wave.
As shown in fig. 1, the rectifier circuit 200 is a bridge rectifier circuit including diodes D1, D2, D3, and D4, and one end of the parallel LC resonant circuit is connected to the intersection between the diodes D1 and D2, and the other end is connected to the intersection between the diodes D3 and D4. The resonant wave can output a stable direct current power supply U after being rectified by the bridge rectifier circuit, and the direct current power supply U supplies power for the signal amplification circuit.
The detector circuit 300 includes a capacitor C3, a resistor R8 and a capacitor C4 connected in parallel, one end of the resistor R8 and one end of the capacitor C4 connected in parallel are connected to the intersection between the diodes D2 and D3 in the bridge rectifier circuit and are connected to one end of the capacitor C3, the other end of the capacitor C3 is connected to the non-inverting input terminal of the amplifier U1 in the signal amplifier circuit 400, and the other end of the resistor R8 and the capacitor C4 connected in parallel are grounded. The resonant wave is subjected to amplitude detection by diodes D2 and D3, a capacitor C4 and a resistor R8, then is coupled to the non-inverting input end of an amplifier U1 through a capacitor C3, and is subjected to signal amplification processing by a signal amplification circuit 400 and then is input to a processor chip 700.
The signal amplifying circuit 400 comprises an amplifier U1, a capacitor C4, a capacitor C5, a resistor R7, a resistor R9 and a resistor R10, wherein the inverting input end of the amplifier U1 is connected with the resistor R9 in series and then grounded, and is connected with the power supply positive input end of the amplifier U1 after being sequentially connected with the resistor R7 and the resistor R10 in series; a capacitor C4 is connected between the non-inverting input end and the output end of the amplifier U1; one end of the capacitor C5 is connected with the non-inverting input end of the amplifier U1, and the other end of the capacitor C5 is grounded; the power supply negative input end of the amplifier U1 is connected with the power supply negative output end of the overvoltage protection circuit 500; the output of amplifier U1 is connected to the signal input of the processor chip.
In this embodiment, the amplifier U1 in the signal amplification circuit 400 is powered by the overvoltage protection circuit, and does not need an external input voltage, thereby simplifying the internal circuit structure of the switch.
The overvoltage protection circuit 500 comprises a capacitor C2, resistors R1-R7, MOS transistors Q1 and Q3 and a triode Q2, wherein one end of the capacitor C2 is connected to the intersection point between the diodes D2 and D3, the emitter of the triode Q2 is connected to the source of the MOS transistor Q3, and the other end of the capacitor C2 is grounded; the collector of the triode Q2 is connected with the resistor R6 in series and then is grounded and is connected with the grid of the MOS transistor Q3; the source electrode of the MOS tube Q3 is connected with the emitter electrode of the triode Q2, and the drain electrode is used as the positive power output end of the overvoltage protection circuit; the resistor R7 is connected between the grid and the source of the MOS transistor Q3;
the resistor R1 and the resistor R2 which are connected in series are connected in parallel at two ends of the capacitor C2; the gate of the MOS transistor Q1 is connected to the intersection point of the resistor R1 and the resistor R2, the drain is grounded, and the source is connected in series with the resistor R4 and the resistor R3 and then connected to the emitter of the triode Q2; one end of the resistor R5 is connected with the intersection point of the resistors R4 and R3, and the other end is connected with the base electrode of the triode Q2;
one end of the resistor R6 is connected with the collector of the triode Q2, and the other end is used as the power supply negative output end of the overvoltage protection circuit.
The principle of the overvoltage protection circuit 500 for performing overvoltage protection on the whole circuit is as follows:
when the voltage across the resistor R2 is less than the on-state voltage of the MOS transistor Q1, the MOS transistor Q1 is turned off, and the base voltage of the transistor Q2 is substantially equal to the emitter voltage thereof, the transistor Q2 is turned off, and VGS of the MOS transistor Q3 is less than 0, the MOS transistor Q3 is turned on, and the supply voltage is output to the signal amplification circuit.
When the voltage at the two ends of the resistor R2 is greater than the conduction voltage of the MOS transistor Q1, the MOS transistor Q1 is conducted, the triode Q2 is also conducted at the moment, but the MOS transistor Q3 is cut off, the power supply voltage cannot be output to the signal amplification circuit, the amplifier U1 does not work, the whole circuit is disconnected at the moment, and the overvoltage protection state is achieved.
As shown in fig. 1, the signal feedback circuit 600 includes a MOS transistor Q4, a transistor Q5, resistors R11-R15, a capacitor C4 and a schottky diode D5, wherein one end of the resistor R11 is connected to the feedback signal output end of the processor chip 700, the other end is connected to the gate of the MOS transistor Q4, the source of the MOS transistor Q4 is connected in series with the resistor R12 and then grounded, the drain is connected in series with the resistor R13 and then connected to the emitter of the transistor Q5, and the schottky diode D5 and the resistor R15 which are connected in series in reverse in sequence are connected and then connected to one end of the LC resonant circuit which is connected in parallel;
the collector of the triode Q5 is connected with the other end of the LC resonance circuit which is connected in parallel, the base electrode is connected with the resistor R14 and the resistor R13 in sequence, then is connected with the emitter electrode of the resistor R14 and the emitter electrode of the resistor R13 in sequence and is connected with the positive input end of the Schottky diode D5; capacitor C4 is connected between the base and emitter of transistor Q5.
The principle of the signal feedback from the processor chip 700 to the PDA device via the signal feedback circuit is as follows:
after the signal transceiver circuit generates resonance waves, the voltage of the base electrode and the emitter electrode of the triode Q5 in the signal feedback circuit is larger than the conduction voltage of the triode Q5, the triode Q5 is in a conduction state, after the processor chip receives radio frequency signals and sends out signals through the signal output port, the MOS tube Q4 which is originally in a cut-off state is conducted, at the moment, part of current flowing through the inductor L1 flows to the ground through the triode Q5, the resistor R13, the MOS tube Q4 and the resistor R12, so that the current flowing through the inductor L1 is increased, but the resonance amplitude generated by the signal transceiver circuit is reduced;
when the signal output port of the processor chip does not send a signal, the MOS transistor Q4 enters the cut-off state again, at this time, the current flowing through the inductor L1 decreases, the resonance amplitude generated by the signal transceiver circuit increases, and the processor chip forms a feedback signal required by the PDA device by alternately controlling the on and off of the MOS transistor Q4, for example, a signal for controlling the green light to be on for indicating that the radio frequency identification signal is successfully received, a signal for controlling the red light to be on for indicating that the radio frequency signal is not successfully received, and the like. Since there are many existing processor chips that can be applied to the present embodiment, a specific brand and model of the processor chip used in the present embodiment will not be described here.
We also use the block chain technology to implement tracing of the RFID tag records scanned by each constructor, as shown in fig. 2, the specific method is:
the PDA devices upload RFID data scanned by constructors to the upper computer, the upper computer establishes a union chain based on a block chain technology, each PDA device serves as an authorization node of the union chain, and the RFID data uploaded by each PDA device is written into the union chain and shared to other authorization nodes of the union chain. Each alliance chain authorization node can call the RFID data (including the RFID data scanned by the constructor through different PDA devices and the RFID data scanned by other constructors through different PDA devices) scanned by the constructor stored in other alliance chain authorization nodes, so that the constructor can trace the RFID data scanned by the constructor or other constructors on the handheld PDA devices.
It should be understood that the above-described embodiments are merely preferred embodiments of the utility model and the technical principles applied thereto. It will be understood by those skilled in the art that various modifications, equivalents, changes, and the like can be made to the present invention. However, such variations are within the scope of the utility model as long as they do not depart from the spirit of the utility model. In addition, certain terminology used in the description and claims of the present application is not limiting, but is used for convenience only.
Claims (7)
1. A signal switch for electric power infrastructure is used for carrying out signal switching with PDA equipment held by constructors, wherein the PDA equipment is used for scanning RFID label information attached to electric power equipment and storing scanned RFID data to the cloud end by using a block chain technology; the resonance wave is rectified by the rectifying circuit and then is respectively input to the detection circuit and the overvoltage protection circuit; the overvoltage protection circuit outputs a direct current power supply to supply power for the signal amplification circuit; the rectified resonance wave is detected by the detection circuit and then outputs a detection signal, the detection signal is amplified by the signal amplifying circuit and then is input to the processor chip,
when the processor chip needs to feed back signals to the PDA device, the feedback signals output by the processor chip are subjected to signal processing by the signal feedback circuit and then fed back to the PDA device by the signal transceiver circuit.
2. The electrical infrastructure signal switch of claim 1, wherein the transceiver circuit is a parallel LC resonant circuit.
3. The signal exchanger as claimed in claim 2, wherein the rectifying circuit is a bridge rectifying circuit composed of diodes D1, D2, D3, and D4, and the parallel LC resonant circuit constitutes the signal transceiver circuit, and one end of the parallel LC resonant circuit is connected to an intersection between the diodes D1 and D2, and the other end is connected to an intersection between the diodes D3 and D4.
4. The signal switch for electric power infrastructure of claim 3, wherein the detector circuit comprises a capacitor C3 and a resistor R8 and a capacitor C4 connected in parallel, one end of the resistor R8 and one end of the capacitor C4 connected in parallel are connected to the intersection point between the diodes D2 and D3 in the bridge rectifier circuit and are connected to one end of the capacitor C3, the other end of the capacitor C3 is connected to the non-inverting input terminal of the amplifier U1 in the signal amplifier circuit, and the other end of the resistor R8 and the other end of the capacitor C4 connected in parallel are grounded.
5. The signal switch for electric power infrastructure of claim 4, wherein the signal amplification circuit comprises an amplifier U1, capacitors C4, C5, resistors R7, R9 and R10, an inverting input terminal of the amplifier U1 is connected in series with the resistor R9 and then grounded, and is connected in series with the resistor R7 and the resistor R10 in sequence and then connected to a positive power supply input terminal thereof, and the positive power supply input terminal of the amplifier U1 is connected to a positive power supply output terminal of the overvoltage protection circuit; the capacitor C4 is connected between the non-inverting input end and the output end of the amplifier U1; one end of the capacitor C5 is connected with the non-inverting input end of the amplifier U1, and the other end of the capacitor C5 is grounded; the power supply negative input end of the amplifier U1 is connected with the power supply negative output end of the overvoltage protection circuit; the output end of the amplifier U1 is connected with the signal input end of the processor chip.
6. The signal exchanger for electric power infrastructure according to claim 3 or 5, characterized in that the overvoltage protection circuit comprises a capacitor C2, resistors R1-R7, MOS transistors Q1, Q3 and a transistor Q2, one end of the capacitor C2 is connected to the intersection point between the diodes D2 and D3 and connected to the emitter of the transistor Q2 and connected to the source of the MOS transistor Q3, and the other end is grounded; the collector of the triode Q2 is connected in series with the resistor R6 and then is grounded and is connected with the grid of the MOS transistor Q3; the source electrode of the MOS transistor Q3 is connected with the emitter electrode of the triode Q2, and the drain electrode of the MOS transistor Q3 is used as the positive power output end of the overvoltage protection circuit; the resistor R7 is connected between the gate and the source of the MOS transistor Q3;
the resistor R1 and the resistor R2 which are connected in series are connected in parallel at two ends of the capacitor C2; the gate of the MOS transistor Q1 is connected to the intersection point of the resistor R1 and the resistor R2, the drain is grounded, and the source is connected in series with the resistor R4 and the resistor R3 and then connected to the emitter of the triode Q2; one end of the resistor R5 is connected with the intersection point of the resistors R4 and R3, and the other end of the resistor R5 is connected with the base electrode of the triode Q2;
one end of the resistor R6 is connected with the collector of the triode Q2, and the other end of the resistor R6 is used as the power supply negative output end of the overvoltage protection circuit.
7. The signal switch for electric power infrastructure of claim 6, wherein the signal feedback circuit comprises a MOS transistor Q4, a transistor Q5, resistors R11-R15, a capacitor C4 and a schottky diode D5, one end of the resistor R11 is connected to the feedback signal output end of the processor chip, the other end of the resistor R11 is connected to the gate of the MOS transistor Q4, the source of the MOS transistor Q4 is connected in series with the resistor R12 and then grounded, the drain of the MOS transistor Q4 is connected in series with the resistor R13 and then connected to the emitter of the transistor Q5, and the schottky diode D5 and the resistor R15 which are connected in series in reverse in sequence are then connected to one end of the LC resonant circuit which is connected in parallel;
the collector of the triode Q5 is connected with the other end of the LC resonance circuit which is connected in parallel, the base of the triode Q5 is connected with the emitter of the resistor R14 and the resistor R13 in sequence and then is connected with the positive input end of the Schottky diode D5; the capacitor C4 is connected between the base and emitter of the transistor Q5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220694998.XU CN217010900U (en) | 2022-03-26 | 2022-03-26 | Signal switch for electric power infrastructure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220694998.XU CN217010900U (en) | 2022-03-26 | 2022-03-26 | Signal switch for electric power infrastructure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217010900U true CN217010900U (en) | 2022-07-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220694998.XU Expired - Fee Related CN217010900U (en) | 2022-03-26 | 2022-03-26 | Signal switch for electric power infrastructure |
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| Country | Link |
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| CN (1) | CN217010900U (en) |
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- 2022-03-26 CN CN202220694998.XU patent/CN217010900U/en not_active Expired - Fee Related
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Granted publication date: 20220719 |