CN211206609U - Non-contact voltage detection device and plug-in structure of non-contact voltage detection device and socket - Google Patents
Non-contact voltage detection device and plug-in structure of non-contact voltage detection device and socket Download PDFInfo
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- CN211206609U CN211206609U CN201921528277.6U CN201921528277U CN211206609U CN 211206609 U CN211206609 U CN 211206609U CN 201921528277 U CN201921528277 U CN 201921528277U CN 211206609 U CN211206609 U CN 211206609U
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Abstract
The utility model discloses a non-contact voltage detection device, include: the device comprises a shell, a signal prompt module arranged on the shell and a detection identification circuit arranged in the shell; an insulating protection seat is fixed at the front end of the shell, and a first plug and a second plug which are used for jacking the socket safety protection door and extending into the socket jack are arranged on the insulating protection seat; a first antenna is fixed in the first plug and is connected with the input end of the detection identification circuit; the signal prompt module is connected with the output end of the detection identification circuit. The utility model also discloses a grafting structure of non-contact voltage detection device and socket. The utility model relates to a rationally ingenious, it is convenient to detect, need not the self-checking, labour saving and time saving can push up safety protection door in coordination through first plug, second plug for first antenna can be close to the electrified body in the socket more, guarantees to measure the accuracy, also is applicable to the socket that does not have safety protection door, easily popularizes.
Description
Technical Field
The utility model relates to a zero live wire detection area, concretely relates to non-contact voltage detection device and with the grafting structure of socket thereof.
Background
With the development of the electronic industry, the types of sockets tend to be diversified, wherein the zero-live wire connection of the two-hole socket is easy to be confused, and because the normal switch controls the live wire, if the connection is wrong, the switch is turned off and only the zero wire is cut off, and the live wire is still electrified, the electric shock accident is easy to cause; meanwhile, some electric appliances have requirements on the access of the zero line and the live line and cannot be reversely connected, if the connection is reversely connected, certain functions cannot be achieved, and even the electric appliances are damaged; therefore, the detection of the national standard two-hole socket is often needed before the socket is installed and important electric devices are used and during maintenance operation.
At present, devices capable of detecting voltage in a non-contact mode are single-plug, after the new 3C forced certification is issued, new national standard sockets are provided with safety protection doors, and for safety, the safety protection doors in two holes are required to be simultaneously applied with force to open the safety protection doors in use; therefore, the voltage measuring device with a single plug on the market cannot be inserted into the jack of a new national standard socket, an effective voltage signal is difficult to detect, a special tool is needed, and the voltage can be detected only by opening the safety protection door of the socket, so that the process is complicated, and time and labor are wasted;
in addition, when the socket is detected by using the voltage measuring device, the existing single-plug voltage measuring device is used, the existing single-plug voltage measuring device needs to be inserted into the jacks of the socket in turn, the states of zero and live line induction signals of two holes of the socket are respectively tested, and the zero and live lines of the socket are distinguished by artificially comparing the indication state effects; the detection efficiency is low, and when the single-plug voltage measuring device is applied to a new national standard socket, the safety protection door can be opened only by a special tool, so that the complexity of operation is further increased undoubtedly;
and secondly, a detection device configured for maintenance personnel has to have a self-detection function, so that the cost is increased, otherwise, because the fault of the single-plug voltage measurement device is inserted into the live wire hole and no response is given, the operator mistakenly regards the live wire as a zero wire, and serious potential safety hazard is caused.
SUMMERY OF THE UTILITY MODEL
In order to solve the problem, the utility model discloses a non-contact voltage detection device and with the grafting structure of socket thereof.
The utility model discloses a realize that the technical scheme that above-mentioned purpose adopted is:
a non-contact voltage detection device comprising: the device comprises a shell, a signal prompt module arranged on the shell and a detection identification circuit arranged in the shell; an insulation protection seat is fixed at the front end of the shell, and a first plug and a second plug which are used for jacking the socket safety protection door and extending into the socket jack are arranged on the insulation protection seat; a first antenna is fixed in the first plug and is connected with the input end of the detection identification circuit; the signal prompt module is connected with the output end of the detection identification circuit.
The detection identification circuit comprises a first analog-to-digital converter and a micro control unit which are connected in sequence; the first antenna is connected to the input end of the first analog-to-digital converter, and the signal prompt module is connected with the output end of the micro control unit.
A second antenna is fixed in the second plug; the detection identification circuit further comprises a second analog-to-digital converter connected to the micro control unit; the second antenna is connected to an input end of the second analog-to-digital converter.
The signal prompting module comprises a live wire state indicator lamp and a zero line state indicator lamp; and the live wire state indicator lamp and the zero line state indicator lamp are fixed on the shell and connected with the micro control unit.
The live wire state indicator lamp comprises a first light emitting diode, and the zero line state indicator lamp comprises a second light emitting diode; the first light emitting diode and the second light emitting diode are respectively connected to a first output end and a second output end of the micro control unit.
The live wire state indicator lamp and the zero line state indicator lamp respectively comprise a third light-emitting diode and a fourth light-emitting diode; the third light-emitting diode and the fourth light-emitting diode are respectively connected with a third output end and a fourth output end of the micro control unit; the first light emitting diode and the second light emitting diode are red light emitting diodes, and the third light emitting diode and the fourth light emitting diode are green light emitting diodes.
The signal prompting module also comprises a buzzer arranged in the shell; and the buzzer is connected with the third output end of the micro control unit through an NPN type triode.
The emitter of the NPN type triode is grounded, and the collector and the base of the NPN type triode are respectively connected with the buzzer and the fifth output end of the micro control unit.
A plug-in structure of a non-contact voltage detection device and a socket comprises a live wire end jack, a zero line end jack, a live wire conductor and a zero wire conductor, wherein the live wire end jack and the zero line end jack are arranged on a shell of the socket, and the live wire conductor and the zero wire conductor are respectively arranged corresponding to the live wire end jack and the zero line end jack; safety protection doors are arranged corresponding to the live wire end jack and the zero line end jack; the first plug and the second plug jointly prop open the safety protection door and are respectively inserted into the live wire end jack and the null wire end jack; the head ends of the first plug and the second plug are respectively close to the live wire connecting conductor and the zero wire connecting conductor.
And a depth limiting groove is formed in the insulating protection seat corresponding to the space between the first plug and the second plug.
The utility model has the advantages that: the utility model has reasonable and ingenious design, convenient detection, no need of self-checking, and the safety protection door can be jacked open by the first plug and the second plug in a cooperative manner, so that the first antenna can be closer to the charged body in the socket, the measurement accuracy is ensured, and other tools outside the device are not needed, the detection process aiming at the new national standard socket is simple and convenient, and the time and the labor are saved; in addition, aiming at the socket without a safety protection door, the device can be applied as well, can meet the use requirements of customers and is easy to popularize; moreover, through the setting of second antenna, the measurement data of socket live wire end, zero line end can be detected simultaneously to the cooperation first antenna, improves detection efficiency.
The present invention will be further described with reference to the accompanying drawings and the following detailed description.
Drawings
Fig. 1 is a perspective view of a non-contact voltage detection device according to an embodiment of the present invention;
fig. 2 is a structural diagram of a detection recognition circuit according to an embodiment of the present invention;
fig. 3 is a diagram illustrating a state of the non-contact voltage detecting device plugged into a socket according to an embodiment of the present invention;
fig. 4 is a cross-sectional view illustrating a state in which the non-contact voltage detecting device is plugged into the socket according to an embodiment of the present invention.
Detailed Description
In an embodiment, referring to fig. 1 to 4, the non-contact voltage detection apparatus provided in this embodiment includes: the device comprises a shell 1, a signal prompt module arranged on the shell 1 and a detection identification circuit arranged in the shell 1; an insulating protection seat 3 is fixed at the front end of the shell 1, and a first plug 31 and a second plug 32 which are used for jacking a safety protection door of the socket and extending into a jack of the socket are arranged on the insulating protection seat 3; a first antenna is fixed in the first plug 31, and the first antenna is connected with the input end of the detection identification circuit; the signal prompt module is connected with the output end of the detection identification circuit.
Specifically, the first plug 31 and the second plug 32 are mutually independent, and the second plug 32 is arranged according to the opening principle of the safety protection door, so that the safety protection door can be jacked open by the aid of the first plug 31 and the second plug 32 in a cooperative manner during detection, the first antenna can be closer to a charged body in the socket, the measurement accuracy is ensured, other tools outside the device are not needed, the detection process for the new national standard socket is simple and convenient, and time and labor are saved; in addition, aiming at the socket without the safety protection door, the socket is provided with two jacks originally, so that the device can be applied to the socket, can meet the use requirements of customers and is easy to popularize.
The detection identification circuit comprises a first analog-to-digital converter and a micro control unit 2 which are connected in sequence; the first antenna is connected to the input end of the first analog-to-digital converter, and the signal prompt module is connected with the output end of the micro control unit 2.
Specifically, the voltage signal detected by the first antenna is transmitted to the first analog-to-digital converter, and the voltage signal detected by the first antenna is subjected to analog-to-digital conversion by the first analog-to-digital converter and then transmitted to the micro control unit 2; the micro control unit 2 controls the signal prompt module to make corresponding feedback according to the input voltage signal.
A second antenna is fixed in the second plug 32; the detection and identification circuit further comprises a second analog-to-digital converter connected to the micro-control unit 2; the second antenna is connected to an input end of the second analog-to-digital converter.
Specifically, through the arrangement of the second antenna, the measurement data of the live wire end and the zero line end of the socket can be simultaneously detected by matching with the first antenna, and firstly, when the socket is detected to be abnormal, the signals of the live wire end and the zero line end can be obtained only by carrying out measurement twice without a conventional voltage measuring device with only a single plug; secondly, by means of simultaneous measurement of the first antenna and the second antenna, even if a user carelessly takes care of, the device can not normally operate and can not feed back to the user through the signal prompting module when the device is not powered on or a power supply of the system fails; the socket can not be misled due to no feedback, such as open circuit of the socket, and the like, and the potential safety hazard is greatly reduced, so that the device can ensure that no misleading maintenance personnel can be ensured without configuring a self-checking function and the potential safety hazard problem of the conventional test pencil is solved compared with the conventional test pencil.
And this device once measures alright obtain the voltage signal of live wire end, zero line end, and is efficient to feedback through signal prompt module, the user obtains the measuring result according to the feedback, makes measuring process convenient and fast, labour saving and time saving.
The signal prompting module comprises a live wire state indicator lamp 41 and a zero line state indicator lamp 42; the live wire status indicator lamp 41 and the zero wire status indicator lamp 42 are fixed on the housing 1 and connected with the micro control unit 2.
The live wire status indicator lamp 41 comprises a first light emitting diode, and the zero wire status indicator lamp 42 comprises a second light emitting diode; the first light emitting diode and the second light emitting diode are respectively connected to a first output end and a second output end of the micro control unit 2.
The live wire status indicator lamp 41 and the zero line status indicator lamp 42 respectively include a third light emitting diode and a fourth light emitting diode; the third light emitting diode and the fourth light emitting diode are respectively connected with a third output end and a fourth output end of the micro control unit 2; the first light emitting diode and the second light emitting diode are red light emitting diodes, and the third light emitting diode and the fourth light emitting diode are green light emitting diodes.
Specifically, through the arrangement of the first antenna and the second antenna, the left side jack and the right side jack of the socket can be measured at the same time, and through the arrangement of the first analog-to-digital converter and the second analog-to-digital converter, a fire wire end measuring signal and a zero wire end measuring signal which are obtained through measurement of the first antenna and the second antenna can be simultaneously converted into digital signals and transmitted to the micro control unit 2, the process is not interfered with each other, and the accuracy of the measuring result can be ensured;
a reference threshold is preset in the micro control unit 2, when the first antenna measures that a voltage signal higher than the reference threshold exists, the micro control unit 2 judges that the first antenna measurement target is a live wire, controls the first light emitting diode to light, and then the live wire state indicator lamp 41 lights red light;
when the second antenna measures that a voltage signal higher than the reference threshold exists, the micro control unit 2 judges that the second antenna measurement target is a live wire and controls the second light emitting diode to light, and then the zero line state indicator lamp 42 lights red light;
maintenance personnel can further judge which end of the socket has dangerous voltage according to the states of the live wire state indicator lamp 41 and the zero line state indicator lamp 42, and further determine whether the live wire is open-circuited, whether the zero line is open-circuited and whether the line connection is abnormal.
In addition, the reference threshold is set according to the voltage standard of different national regions and is an accurate numerical value, in a preferred embodiment, a plurality of reference thresholds are preset, and before the measurement signal of the fire wire end and the measurement signal of the zero wire end which are converted by the analog-to-digital converter are obtained, a proper reference threshold is selected according to the national region where a worker is located; the setting principle of the reference threshold is as follows: the national standard socket is equivalent to an alternating power supply, an alternating electric field is formed around the national standard socket, and the antenna extends into the alternating electric field, so that corresponding alternating voltage can be induced; meanwhile, because factors such as environment and the like are interfered by other non-test target electric fields and the like, misleading signals are generated, but during testing, the antenna is inserted into the jack of the socket and protected by the shell of the socket, so that the interference signals can be reduced to the minimum, therefore, a reference threshold is set, when the test signals are smaller than the reference threshold, the test signals are regarded as the interference signals, and the signals are not transmitted to the next step, so that the subsequent judgment is not influenced; if the reference threshold is not set, the interference signal is allowed to continue to be transmitted, and then subsequent judgment is interfered, so that serious potential safety hazard is brought.
The signal prompting module also comprises a buzzer arranged in the shell 1; the buzzer is connected with a third output end of the micro control unit through an NPN type triode; the emitter of the NPN type triode is grounded, and the collector and the base of the NPN type triode are respectively connected with the buzzer and the fifth output end of the micro control unit 2.
In a preferred embodiment, the non-contact voltage detection device is provided with an intelligent gear, a fluctuation threshold is preset in the control unit, and when the gear is adjusted, the micro control unit 2 acquires a live wire end measurement signal and a zero wire end measurement signal which are converted by the analog-to-digital converter; when the live wire end measurement signal and the zero line end measurement signal are smaller than the reference threshold, determining that the live wire is open-circuited, and controlling a buzzer to alarm, wherein the first light-emitting diode, the second light-emitting diode, the third light-emitting diode and the fourth light-emitting diode are not lighted, and the live wire state indicator lamp 41 and the zero line state indicator lamp 42 are both lighted by green light;
when the measuring signal of the live wire end and the measuring signal of the zero line end are larger than the reference threshold, judging whether the absolute value of the difference value of the measuring signal of the live wire end and the measuring signal of the zero line end is smaller than the fluctuation threshold;
if the absolute value of the difference value of the live wire end measuring signal and the zero line end measuring signal is smaller than the fluctuation threshold, determining that the zero line is open-circuited, controlling the first light-emitting diode and the second light-emitting diode to light, enabling the live wire state indicator lamp 41 and the zero line state indicator lamp 42 to light red light, and driving the buzzer to alarm;
if the absolute value of the difference value of the fire wire end measuring signal and the zero line end measuring signal is larger than the fluctuation threshold, comparing the fire wire end measuring signal with the zero line end measuring signal;
when the measurement signal of the fire wire end is greater than the measurement signal of the zero line end, the normal wiring of the line is determined; controlling the first light-emitting diode and the fourth light-emitting diode to light, so that the live wire state indicator lamp 41 lights red light, the zero line state indicator lamp 42 lights green light, and the buzzer does not give an alarm;
when the measurement signal of the live wire end is smaller than the measurement signal of the zero wire end, the abnormal wiring of the line is determined, the second light emitting diode and the third light emitting diode are controlled to be lightened, the live wire state indicator lamp 41 is lightened to emit green light, the zero wire state indicator lamp 42 is lightened to emit red light, and the buzzer is controlled to give an alarm.
When the user detects the socket through the device, whether the socket is abnormal can be known according to whether the buzzer gives an alarm or not; and then the abnormal types can be distinguished according to the lighting colors of the live wire state indicator lamp 41 and the zero line state indicator lamp 42. Even non-professional personnel can easily distinguish whether the socket can be normally used, so that the application range of the product is improved, and the socket is easy to popularize;
the fluctuation threshold is set according to the distance between two holes of the socket and is an accurate numerical value, the smaller the distance between the holes is, the closer the zero line end measuring signal is to the fire line end measuring signal when the zero line is in an open circuit, and the smaller the set fluctuation threshold is.
In a preferred embodiment, the sixth output of the mcu 2 is further connected to a display screen, and the user can distinguish the abnormal type by the text displayed on the screen.
Specifically, the input ends of the first analog-to-digital converter and the second analog-to-digital converter are connected with a first voltage dividing resistor and a second voltage dividing resistor which have the same resistance values; and a capacitor is connected in parallel to the second voltage-dividing resistor.
A non-contact type voltage detection device and socket plug-in structure, the said socket 5 includes the live wire terminal jack, zero line terminal jack and connects live wire conductor 51, connects the live wire conductor 52 that the said live wire terminal jack, zero line terminal jack set up separately on the outer cover of the socket; a safety protection door 53 is arranged corresponding to the live wire end jack and the zero line end jack; the first plug 31 and the second plug 32 jointly push the safety protection door 53 open and are respectively inserted into the live wire end jack and the null wire end jack; the first plug 31 and the second plug 32 have their leading ends respectively close to the live wire conductor 51 and the neutral wire conductor 52.
A depth limiting groove 33 is formed in the insulation protection base 3 corresponding to the space between the first plug 31 and the second plug 32.
Specifically, the safety protection door 53 is pushed open by the first plug 31 and the second plug 32 together, and the safety protection door 53 is designed according to the opening principle of the safety protection door 53 of the new national standard socket 5, so that the first antenna and the second antenna can be close to the live wire conductor 51 and the neutral wire conductor 52; and the first plug 31 and the second plug 32 are prevented from being inserted into and transited to damage the socket 5 through the arrangement of the depth limiting groove 33.
Therefore, the plug structure is ingenious in design, the first antenna and the second antenna can be close to the live wire conductor 51 and the null wire conductor 52, detection accuracy is improved, meanwhile, the socket 5 is protected, and the service life is prolonged.
In addition, the device is inserted into the socket by the following method: the insulation protection seat 3 drives the first plug 31 and the second plug 32 to be respectively inserted into a live wire end jack and a neutral wire end jack of the socket 5, and the first plug 31 and the second plug 32 apply force together along a direction perpendicular to the safety protection door 53 to extrude the safety protection door 53;
the first plug 31 and the second plug 32 are pushed towards the depth limiting groove 33 to be continuously inserted to the limiting groove limiting position, so that the head ends of the first plug 31 and the second plug 32 are respectively close to the live wire conductor 51 and the zero wire conductor 52.
Specifically, the first plug 31 and the second plug 32 apply force together along a direction perpendicular to the safety protection door 53 to press the safety protection door 53, so that the safety protection door 53 can be easily pushed open; in addition, the process of inserting the socket 5 does not need to use tools outside the device, so that the operation is simplified; the process of inserting the voltage detection device into the socket 5 is simple and convenient to operate.
When the safety protection door 53 is used, the machine is powered on firstly, the first plug 31 and the second plug 32 are respectively inserted into a live wire end jack and a neutral wire end jack of the socket 5, and the first plug 31 and the second plug 32 apply force together along a direction perpendicular to the safety protection door 53 to extrude the safety protection door 53; pushing the first plug 31 and the second plug 32 to continue to be inserted into the limiting groove limiting position towards the depth limiting groove 33 direction, so that the head ends of the first plug 31 and the second plug 32 are respectively close to the live wire conductor 51 and the zero wire conductor 52;
the first antenna and the second antenna respectively measure voltage signals simultaneously;
when the first antenna measures that the voltage signal higher than the reference threshold exists, the micro control unit 2 judges that the first antenna measurement target is a live wire, controls the first light emitting diode to light, and then the live wire state indicator lamp 41 lights red light;
when the second antenna measures that the voltage signal higher than the reference threshold exists, the micro control unit 2 judges that the second antenna measurement target is a live wire, controls the second light emitting diode to be lightened, and then the zero line state indicator lamp 42 lights red light.
The utility model has reasonable and ingenious design, convenient detection, no need of self-checking, and can jack the safety protection door 53 by the first plug 31 and the second plug 32 in a cooperative manner, so that the first antenna can be closer to the charged body in the socket 5, the measurement accuracy is ensured, and other tools except the device are not needed, the detection flow for the new national standard socket 5 is simple and convenient, and the time and the labor are saved; in addition, aiming at the socket 5 without the safety protection door 53, the device can be applied as well, can meet the use requirements of customers and is easy to popularize; moreover, through the setting of second antenna, the measurement data of 5 live wire ends of socket, zero line end can be detected simultaneously to the cooperation first antenna, improves detection efficiency.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention in any way. The technical solution of the present invention can be used by anyone skilled in the art to make many possible variations and modifications, or to modify equivalent embodiments, using the technical means and contents disclosed above, without departing from the scope of the technical solution of the present invention. Therefore, the equivalent changes made according to the shape, structure and principle of the present invention should be covered in the protection scope of the present invention.
Claims (10)
1. A non-contact voltage detecting apparatus, comprising: the device comprises a shell, a signal prompt module arranged on the shell and a detection identification circuit arranged in the shell;
an insulation protection seat is fixed at the front end of the shell, and a first plug and a second plug which are used for jacking the socket safety protection door and extending into the socket jack are arranged on the insulation protection seat;
a first antenna is fixed in the first plug and is connected with the input end of the detection identification circuit;
the signal prompt module is connected with the output end of the detection identification circuit.
2. The non-contact voltage detection device according to claim 1, wherein the detection identification circuit comprises a first analog-to-digital converter and a micro control unit which are connected in sequence;
the first antenna is connected to the input end of the first analog-to-digital converter, and the signal prompt module is connected with the output end of the micro control unit.
3. The noncontact voltage detecting device of claim 2, wherein a second antenna is fixed in said second plug;
the detection identification circuit further comprises a second analog-to-digital converter connected to the micro control unit;
the second antenna is connected to an input end of the second analog-to-digital converter.
4. The non-contact voltage detection device according to claim 2, wherein the signal prompt module comprises a live line status indicator light and a neutral line status indicator light;
and the live wire state indicator lamp and the zero line state indicator lamp are fixed on the shell and connected with the micro control unit.
5. The contactless voltage detection apparatus according to claim 4, wherein the live status indicator light includes a first light emitting diode therein, and the neutral status indicator light includes a second light emitting diode therein;
the first light emitting diode and the second light emitting diode are respectively connected to a first output end and a second output end of the micro control unit.
6. The non-contact voltage detecting device according to claim 5, wherein the live line status indicator light and the neutral line status indicator light each further comprise a third light emitting diode and a fourth light emitting diode;
the third light-emitting diode and the fourth light-emitting diode are respectively connected with a third output end and a fourth output end of the micro control unit;
the first light emitting diode and the second light emitting diode are red light emitting diodes, and the third light emitting diode and the fourth light emitting diode are green light emitting diodes.
7. The non-contact voltage detection device of claim 6, wherein the signal prompt module further comprises a buzzer disposed within the housing;
and the buzzer is connected with the third output end of the micro control unit through an NPN type triode.
8. The apparatus according to claim 7, wherein the emitter of the NPN transistor is grounded, and the collector and the base of the NPN transistor are respectively connected to the buzzer and the fifth output terminal of the MCU.
9. A plug-in structure of a non-contact voltage detection device and a socket is characterized in that the socket comprises a live wire end jack and a zero wire end jack which are arranged on a shell of the socket, and a live wire conductor and a zero wire conductor which are respectively arranged corresponding to the live wire end jack and the zero wire end jack; safety protection doors are arranged corresponding to the live wire end jack and the zero line end jack;
the first plug and the second plug jointly prop open the safety protection door and are respectively inserted into the live wire end jack and the null wire end jack;
the head ends of the first plug and the second plug are respectively close to the live wire connecting conductor and the zero wire connecting conductor.
10. The plug-in structure of the non-contact voltage detecting device and the socket according to claim 9, wherein a depth-limiting groove is formed in the insulating protection seat corresponding to a space between the first plug and the second plug.
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| CN201921528277.6U CN211206609U (en) | 2019-09-16 | 2019-09-16 | Non-contact voltage detection device and plug-in structure of non-contact voltage detection device and socket |
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| CN201921528277.6U CN211206609U (en) | 2019-09-16 | 2019-09-16 | Non-contact voltage detection device and plug-in structure of non-contact voltage detection device and socket |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110632364A (en) * | 2019-09-16 | 2019-12-31 | 优利德科技(中国)股份有限公司 | Non-contact voltage detection device, plug-in structure and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110632364A (en) * | 2019-09-16 | 2019-12-31 | 优利德科技(中国)股份有限公司 | Non-contact voltage detection device, plug-in structure and method |
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