CN210038128U - Detection circuit for identifying reverse connection of fire and zero lines and PCB - Google Patents
Detection circuit for identifying reverse connection of fire and zero lines and PCB Download PDFInfo
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- CN210038128U CN210038128U CN201920688495.XU CN201920688495U CN210038128U CN 210038128 U CN210038128 U CN 210038128U CN 201920688495 U CN201920688495 U CN 201920688495U CN 210038128 U CN210038128 U CN 210038128U
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Abstract
The utility model provides a discernment live wire zero line connects detection circuitry and PCB board conversely, and detection circuitry includes: the induction antenna is connected with the grid electrode of the field-effect tube, the source electrode of the field-effect tube is grounded, the drain electrode of the field-effect tube is respectively connected with one ends of a resistor R1 and a resistor R2, the other end of the resistor R1 is respectively connected with a power supply voltage and one end of a resistor R3, the other end of the resistor R2 is connected with the base electrode of the triode, the emitting electrode of the triode is grounded, the collecting electrode of the triode is respectively connected with the other end of a resistor R3 and one end of a resistor R4, the other end of the resistor R4 is connected with the MCU, the influence of the external environment can be avoided, and whether the connection.
Description
Technical Field
The utility model belongs to the technical field of the power technology and specifically relates to a discernment live wire zero line connects detection circuitry and PCB board of turning over.
Background
Referring to fig. 1, the alarm circuit for recognizing the reverse connection of the live wire and the zero wire is integrated near a PCB and used for sensing live wire and zero wire signals. The alarm circuit comprises a field effect transistor K3OA, and the field effect transistor K3OA is easily affected by the external environment temperature, so that the change of the threshold value is caused. When the field effect tube K3OA is in a low-temperature environment, the threshold value is increased, so that signals of a live wire and a zero wire cannot be induced; when the fet K3OA is in a high temperature environment, the threshold becomes small, and although the live wire and the neutral wire can be sensed, it is not possible to distinguish between the live wire and the neutral wire. In addition, the alarm circuit also comprises an induction antenna, and the length of the induction antenna can influence the induction of the live wire and the zero line signals.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model aims at providing an discernment live wire and zero line connect reverse detection circuitry and PCB board, do not receive external environment's influence, and whether accurate connection that detects live wire and zero line is correct.
In a first aspect, the embodiment of the utility model provides an it connects reverse detection circuitry to discern live wire and zero line, detection circuitry includes: the circuit comprises an induction antenna, a field effect transistor, a triode, a resistor R1, a circuit R2, a resistor R3, a resistor R4 and a Micro Control Unit (MCU);
the induction antenna with the grid of field effect transistor is connected, the source ground of field effect transistor, the drain electrode of field effect transistor respectively with resistance R1 and resistance R2's one end is connected, the other end of resistance R1 respectively with mains voltage with the one end of resistance R3 is connected, the other end of resistance R2 with the base of triode is connected, the projecting pole ground connection of triode, the collecting electrode of triode respectively with the other end of resistance R3 with the one end of resistance R4 is connected, the other end of resistance R4 is connected MCU.
With reference to the first aspect, embodiments of the present invention provide a first possible implementation manner of the first aspect, wherein the induction antenna is configured to induce a sine wave ac signal;
and the field effect transistor is used for outputting a square wave signal with high and low levels according to the sine wave alternating current signal under the condition of conduction.
With reference to the first possible implementation manner of the first aspect, an embodiment of the present invention provides a second possible implementation manner of the first aspect, wherein the triode is configured to perform inversion and amplification processing on the high and low level square wave information to obtain an amplified square wave signal.
In combination with the second possible implementation manner of the first aspect, an embodiment of the present invention provides a third possible implementation manner of the first aspect, wherein the MCU is configured to determine that the live line and the neutral line are correctly connected according to the amplified square wave signal.
With reference to the first aspect, an embodiment of the present invention provides a fourth possible implementation manner of the first aspect, wherein the induction antenna is configured to induce an alternating current signal;
the field effect transistor is used for outputting high level under the condition of non-conduction.
With reference to the fourth possible implementation manner of the first aspect, an embodiment of the present invention provides a fifth possible implementation manner of the first aspect, wherein the transistor is configured to output a low level when the transistor is turned on.
In combination with the fifth possible implementation manner of the first aspect, an embodiment of the present invention provides a sixth possible implementation manner of the first aspect, wherein the MCU is configured to determine that the live line and the zero line are incorrectly connected according to the low level, and output an alarm signal.
With reference to the third or sixth possible implementation manner of the first aspect, an embodiment of the present invention provides a seventh possible implementation manner of the first aspect, wherein the inductive antenna is a pin.
In a second aspect, the embodiment of the present invention provides a PCB, include as above the reverse detection circuit of discernment live wire and zero line, detection circuit integration is in on the PCB, still include: copper-clad area, live wire and zero line.
In combination with the second aspect, the embodiments of the present invention provide a first possible implementation manner of the second aspect, wherein when the live wire is correctly connected to the neutral wire, the live wire is connected to the copper-clad area;
and when the live wire is connected with the zero wire in error, the zero wire is connected with the copper-coated area.
The embodiment of the utility model provides a discernment live wire zero line connects detection circuitry and PCB board conversely, and detection circuitry includes: the induction antenna is connected with the grid electrode of the field-effect tube, the source electrode of the field-effect tube is grounded, the drain electrode of the field-effect tube is respectively connected with one ends of a resistor R1 and a resistor R2, the other end of the resistor R1 is respectively connected with a power supply voltage and one end of a resistor R3, the other end of the resistor R2 is connected with the base electrode of the triode, the emitting electrode of the triode is grounded, the collecting electrode of the triode is respectively connected with the other end of a resistor R3 and one end of a resistor R4, the other end of the resistor R4 is connected with the MCU, the influence of the external environment can be avoided, and whether the connection.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic diagram of an alarm circuit for identifying reverse connection of live and neutral wires in the prior art;
fig. 2 is a schematic diagram of a detection circuit structure for identifying reverse connection of the live wire and the neutral wire according to a first embodiment of the present invention;
fig. 3 is a schematic diagram of an output waveform signal according to a first embodiment of the present invention;
fig. 4 is a second schematic diagram of an output waveform signal provided by the first embodiment of the present invention;
fig. 5 is a schematic view of a PCB board provided by the second embodiment of the present invention.
Icon:
10-a detection circuit; 20-copper-clad area; 30-PCB board.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
And an alarm circuit for identifying reverse connection of the live wire and the zero wire is integrated near the PCB and used for sensing live wire and zero wire signals. The alarm circuit comprises a field effect transistor K3OA, and the field effect transistor K3OA is easily affected by the external environment temperature, so that the change of the threshold value is caused. When the field effect tube K3OA is in a low-temperature environment, the threshold value is increased, so that signals of a live wire and a zero wire cannot be induced; when the fet K3OA is in a high temperature environment, the threshold becomes small, and although the live wire and the neutral wire can be sensed, it is not possible to distinguish between the live wire and the neutral wire. In addition, the alarm circuit also comprises an induction antenna, and the length of the induction antenna can influence the induction of the live wire and the zero line signals.
The embodiment of the utility model provides a discernment live wire zero line connects detection circuitry and PCB board conversely, and detection circuitry includes: the induction antenna is connected with the grid electrode of the field-effect tube, the source electrode of the field-effect tube is grounded, the drain electrode of the field-effect tube is respectively connected with one ends of a resistor R1 and a resistor R2, the other end of the resistor R1 is respectively connected with a power supply voltage and one end of a resistor R3, the other end of the resistor R2 is connected with the base electrode of the triode, the emitting electrode of the triode is grounded, the collecting electrode of the triode is respectively connected with the other end of a resistor R3 and one end of a resistor R4, the other end of the resistor R4 is connected with the MCU, the influence of the external environment can be avoided, and whether the connection.
To facilitate understanding of the present embodiment, the following detailed description will be given of embodiments of the present invention.
The first embodiment is as follows:
fig. 2 is a schematic diagram of a detection circuit structure for identifying reverse connection of the live wire and the neutral wire provided by the embodiment of the present invention.
Referring to fig. 2, the detection circuit includes: the device comprises an induction antenna, a field effect transistor D1, a triode QT3, a resistor R1, a resistor R2, a resistor R3, a resistor R4 and a micro control unit MCU;
the induction antenna is connected with a grid G of a field effect transistor D1, a source S of the field effect transistor D1 is grounded, a drain D of a field effect transistor D1 is respectively connected with one ends of a resistor R1 and a resistor R2, the other end of the resistor R1 is respectively connected with a power supply voltage VCC and one end of a resistor R3, the other end of the resistor R2 is connected with a base of a triode QT3, an emitter of the triode QT3 is grounded, a collector of the triode QT3 is respectively connected with the other end of a resistor R3 and one end of the resistor R4, and the other end of the resistor R4 is connected with an MCU (micro controller Unit).
Further, the induction antenna is used for inducing a sine wave alternating current signal;
the fet D1 is used to output a square wave signal of high and low levels from the sine wave ac signal when it is turned on.
Further, the transistor QT3 is configured to perform inversion and amplification processing on the high and low level square wave information to obtain an amplified square wave signal.
Further, the MCU is used for determining the correct connection of the live wire and the zero wire according to the amplified square wave signal.
In this embodiment, the difference in electric field radiation between the live line and the neutral line is used to set the induction antenna as a floating ground, and when the live line and the neutral line are correctly connected (the live line is connected to the copper-clad area), the induction antenna senses a strong sine wave ac signal to turn on the field effect transistor D1(LSI1012LT1G), and outputs a high-low level square wave signal, which is a correct signal, indicating that the live line and the neutral line are correctly connected. Referring to fig. 3, the triode QT3 outputs an amplified square wave signal and sends it to the MCU.
Further, the induction antenna is used for inducing an alternating current signal;
the fet D1 is used to output a high level when it is not conducting.
Further, the triode is used for outputting low level under the condition of conduction.
Further, the MCU is used for determining the wrong connection between the live wire and the zero wire according to the low level and outputting an alarm signal.
In this embodiment, when the live wire and the zero line are connected incorrectly (the zero line is connected with the copper-clad area), the inductive antenna senses a weak alternating current signal (almost 0), the field effect transistor D1 cannot be conducted, a high level is output, the transistor QT3 is always in a conducting state, a low level is output, and the transistor QT3 is sent to the MCU, and the MCU outputs an alarm signal for reminding. Referring to fig. 4 in particular, when the live line and the neutral line are reversely connected, the waveform output to the MCU is almost a straight line, so that whether the live line and the neutral line are correctly connected is determined according to the output waveform.
The induction antenna is a contact pin which is vertically inserted on the PCB. The induction antenna in this application is different from prior art, and induction antenna adopts the contact pin, and the copper foil is walked the line not, has just also reduced the parasitic parameter between the board, therefore receives ambient temperature to influence for a short time. The signal can be accurately sensed through the contact pin, the influence of the external environment is avoided, the temperature of minus 45-85 ℃ can be met, the performance is stable, and the practical range is wide.
Example two:
fig. 5 is a schematic view of a PCB board provided by the second embodiment of the present invention.
Referring to fig. 5, the PCB includes a detection circuit 10 for identifying reverse connection of the live wire and the neutral wire, and the detection circuit 10 is integrated on the PCB 30, and further includes: a copper-clad zone 20, live and neutral wires. Wherein the pins are vertically disposed at J2 on the PCB board 30.
Further, when the live wire is correctly connected with the zero wire, the live wire is connected with the copper-clad area 20;
when the live wire is incorrectly connected to the neutral wire, the neutral wire is connected to the coppering area 20.
The embodiment of the utility model provides a discernment live wire zero line connects detection circuitry and PCB board conversely, and detection circuitry includes: the induction antenna is connected with the grid electrode of the field-effect tube, the source electrode of the field-effect tube is grounded, the drain electrode of the field-effect tube is respectively connected with one ends of a resistor R1 and a resistor R2, the other end of the resistor R1 is respectively connected with a power supply voltage and one end of a resistor R3, the other end of the resistor R2 is connected with the base electrode of the triode, the emitting electrode of the triode is grounded, the collecting electrode of the triode is respectively connected with the other end of a resistor R3 and one end of a resistor R4, the other end of the resistor R4 is connected with the MCU, the influence of the external environment can be avoided, and whether the connection.
The embodiment of the present invention provides a computer program product, which includes a computer readable storage medium storing a program code, wherein the instruction included in the program code can be used to execute the method described in the foregoing method embodiment, and the specific implementation can refer to the method embodiment, which is not described herein again.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the system and the apparatus described above may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In addition, in the description of the embodiments of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to perform all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Finally, it should be noted that: the above-mentioned embodiments are only specific embodiments of the present invention, and are not intended to limit the technical solution of the present invention, and the protection scope of the present invention is not limited thereto, although the present invention is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: those skilled in the art can still modify or easily conceive of changes in the technical solutions described in the foregoing embodiments or make equivalent substitutions for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A detection circuit for identifying reverse connection of a live wire and a neutral wire, the detection circuit comprising: the device comprises an induction antenna, a field effect transistor, a triode, a resistor R1, a resistor R2, a resistor R3, a resistor R4 and a Micro Control Unit (MCU);
the induction antenna is connected with the grid electrode of the field effect transistor, the source electrode of the field effect transistor is grounded, the drain electrode of the field effect transistor is respectively connected with one ends of the resistor R1 and the resistor R2, the other end of the resistor R1 is respectively connected with power voltage and one end of the resistor R3, the other end of the resistor R2 is connected with the base electrode of the triode, the emitting electrode of the triode is grounded, the collector electrode of the triode is respectively connected with the other end of the resistor R3 and one end of the resistor R4, and the other end of the resistor R4 is connected with the MCU.
2. The detection circuit for identifying the reverse connection of the live wire and the neutral wire according to claim 1, wherein the induction antenna is used for inducing a sine wave alternating current signal;
and the field effect transistor is used for outputting a square wave signal with high and low levels according to the sine wave alternating current signal under the condition of conduction.
3. The detection circuit for identifying the reverse connection of the live wire and the neutral wire according to claim 2, wherein the triode is used for reversing and amplifying the high-level and low-level square wave information to obtain an amplified square wave signal.
4. The detection circuit for identifying reverse connection of a live wire and a neutral wire according to claim 3, wherein the MCU is configured to determine that the live wire and the neutral wire are properly connected according to the amplified square wave signal.
5. The detection circuit for identifying the reverse connection of the live wire and the neutral wire according to claim 1, wherein the induction antenna is used for inducing an alternating current signal;
the field effect transistor is used for outputting high level under the condition of non-conduction.
6. The detection circuit for identifying reverse connection of a live wire and a neutral wire of claim 5, wherein the triode is used for outputting a low level when being conducted.
7. The detection circuit for identifying the reverse connection of the live wire and the neutral wire according to claim 6, wherein the MCU is used for determining the wrong connection of the live wire and the neutral wire according to the low level and outputting an alarm signal.
8. The detection circuit for identifying reverse connection of a live wire and a neutral wire according to claim 4 or 7, wherein the induction antenna is a pin.
9. A PCB board comprising the detection circuit for identifying reverse connection of live wire and neutral wire of any one of claims 1 to 8, the detection circuit being integrated on the PCB board, further comprising: copper-clad area, live wire and zero line.
10. The PCB panel of claim 9, wherein the live wire is connected to the copper-clad area when the live wire is properly connected to the neutral wire;
and when the live wire is connected with the zero wire in error, the zero wire is connected with the copper-coated area.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920688495.XU CN210038128U (en) | 2019-05-14 | 2019-05-14 | Detection circuit for identifying reverse connection of fire and zero lines and PCB |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920688495.XU CN210038128U (en) | 2019-05-14 | 2019-05-14 | Detection circuit for identifying reverse connection of fire and zero lines and PCB |
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| CN210038128U true CN210038128U (en) | 2020-02-07 |
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| CN201920688495.XU Active CN210038128U (en) | 2019-05-14 | 2019-05-14 | Detection circuit for identifying reverse connection of fire and zero lines and PCB |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113534005A (en) * | 2021-06-24 | 2021-10-22 | 宁波方太厨具有限公司 | Electric leakage detection method of cleaning machine |
| CN113567881A (en) * | 2021-06-24 | 2021-10-29 | 宁波方太厨具有限公司 | Working method for reducing false alarm leakage fault of cleaning machine |
-
2019
- 2019-05-14 CN CN201920688495.XU patent/CN210038128U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113534005A (en) * | 2021-06-24 | 2021-10-22 | 宁波方太厨具有限公司 | Electric leakage detection method of cleaning machine |
| CN113567881A (en) * | 2021-06-24 | 2021-10-29 | 宁波方太厨具有限公司 | Working method for reducing false alarm leakage fault of cleaning machine |
| CN113534005B (en) * | 2021-06-24 | 2022-10-21 | 宁波方太厨具有限公司 | Electric leakage detection method of cleaning machine |
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