CN219871732U - Automatic zero line selector - Google Patents
Automatic zero line selector Download PDFInfo
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- CN219871732U CN219871732U CN202320994352.8U CN202320994352U CN219871732U CN 219871732 U CN219871732 U CN 219871732U CN 202320994352 U CN202320994352 U CN 202320994352U CN 219871732 U CN219871732 U CN 219871732U
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- thyristor
- relay
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- 239000003990 capacitor Substances 0.000 claims description 24
- 230000007935 neutral effect Effects 0.000 claims description 10
- 230000000087 stabilizing effect Effects 0.000 claims description 6
- 238000010586 diagram Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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Abstract
The utility model discloses an automatic zero line selector, which comprises a power supply module, a live wire zero line judging module and a zero line selecting module, wherein the live wire zero line judging module and the zero line selecting module are connected in series with the power supply module; three wiring terminals are arranged on the power supply module, the two wiring terminals are respectively connected with a live wire and a zero wire to be selected, and the other wiring terminal is grounded; the live wire zero line judging module comprises a controllable rectifying module and a ground wire module connected with the controllable rectifying module, and the controllable rectifying module is also connected with the zero line selecting module; the zero line selection module comprises a selection relay and a zero line output terminal, and the selection relay is respectively connected with the controllable rectifying module and the zero line output terminal. The automatic zero line selector can connect the live wire, the zero line and the ground wire on the three wiring terminals arranged on the power supply module under the condition of power failure, so that the electric shock hazard can be avoided, and meanwhile, the zero line output terminal is automatically connected to the zero line through the selection relay according to the state of being connected to the zero live wire terminal, so that the automatic zero line selector is simple, convenient and high in accuracy.
Description
Technical Field
The utility model discloses an automatic zero line selector, and belongs to the technical field of electric power detection.
Background
The protection and grounding of the casing of the electrical equipment is an important measure for ensuring personal safety, but in the actual installation of the electrical equipment, a plurality of places are not provided with power ground wires, and in the case, the power zero wires with the same electric potential as the ground wires can be adopted for protection, so that the correct selection of the power zero wires is particularly important.
In the prior art, a method for selecting a power zero line generally uses an electroscope, a universal meter and other power measuring tools to judge the zero line from the zero line and the live line, and then performs wiring treatment.
However, the method introduces human judgment, which is easy to cause confusion of the zero line and the ground line, and needs to use a power measuring tool, and the electric wire needs to be electrified for judgment, which is easy to cause electric shock hazard.
Disclosure of Invention
The utility model aims to provide an automatic zero line selector which is used for solving the technical problems of low accuracy and low safety of zero line judgment in the prior art.
The automatic zero line selector comprises a power supply module, a live wire zero line judgment module and a zero line selection module, wherein the live wire zero line judgment module and the zero line selection module are connected in series with the power supply module;
three wiring terminals are arranged on the power supply module, wherein two wiring terminals are respectively connected with a live wire and a zero wire to be selected, and the other wiring terminal is grounded;
the live wire zero line judging module comprises a controllable rectifying module and a ground wire module; the controllable rectifying module is respectively connected with the ground wire module and the zero line selection module;
the zero line selection module comprises a selection relay and a zero line output terminal, and the selection relay is respectively connected with the controllable rectifying module and the zero line output terminal.
Preferably, the controllable rectifying module comprises a first thyristor, a second thyristor and a sixth capacitor;
one end of the first thyristor is connected with the zero line selection module, and the other end of the first thyristor is connected with one end of the second thyristor;
the sixth capacitor is arranged between the first thyristor and the second thyristor and grounded;
the other end of the second thyristor is connected with the ground wire module.
Preferably, the controllable rectifying module further comprises a sixth resistor and an eighth resistor;
the sixth resistor is arranged between the second thyristor and the sixth capacitor and is connected in series with the second thyristor;
and two ends of the eighth resistor are respectively connected with the first thyristor and the zero line selection module.
Preferably, the ground wire module comprises a fifth capacitor and a fourth capacitor, a fourth resistor and a fifth resistor which are sequentially connected in series;
the fourth capacitor is also connected with a ground wire connecting terminal;
the fifth resistor is also connected with the controllable rectifying module;
the fifth capacitor is arranged between the fifth resistor and the controllable rectifying module and grounded.
Preferably, the zero line selection module further comprises a triode;
and the base electrode of the triode is connected with the controllable rectifying module, the emitting electrode of the triode is connected with the ground, and the collecting electrode of the triode is connected with the selection relay.
Preferably, the power supply further comprises a power-off protection module connected in series with the power supply;
the power-off protection module comprises a first relay, a second resistor connected in series with the first relay and a diode connected in parallel with the first relay.
Preferably, the first relay is a double pole single throw relay.
Preferably, the power module further includes a voltage stabilizing unit and a rectifying unit connected in parallel.
Preferably, the selection relay is a single pole double throw relay.
Compared with the prior art, the automatic zero line selector has the following beneficial effects:
the automatic zero line selector can connect the live wire, the zero line and the ground wire on the three wiring terminals arranged on the power supply module under the condition of power failure, so that the electric shock hazard can be avoided, and meanwhile, the zero line output terminal is automatically connected to the zero line through the selection relay according to the state of being connected to the zero live wire terminal, so that the automatic zero line selector is simple, convenient and high in accuracy.
Drawings
Fig. 1 (a) is a circuit diagram of a power module according to an embodiment of the present utility model, (b) is a circuit diagram of a dc output terminal, and (c) is a circuit diagram of the OPA in fig. 3;
fig. 2 is a circuit diagram of a live wire zero line judging module in an embodiment of the utility model;
FIG. 3 is a circuit diagram of a neutral selection module according to an embodiment of the present utility model;
fig. 4 is a circuit diagram of an interrupt protection module according to an embodiment of the utility model.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth such as the particular system architecture, techniques, etc., in order to provide a thorough understanding of the embodiments of the present utility model. It will be apparent, however, to one skilled in the art that the present utility model may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present utility model with unnecessary detail.
The automatic zero line selector of the embodiment of the utility model is shown in fig. 1 to 4, and comprises a power supply module, a live wire zero line judging module and a zero line selecting module which are connected in series with the power supply module;
three wiring terminals are arranged on the power supply module, wherein two wiring terminals are respectively connected with a live wire and a zero wire to be selected, as shown in 220V_A and 220V_B in figure 1, and the other wiring terminal is grounded;
the live wire zero line judging module comprises a controllable rectifying module and a ground wire module; the controllable rectifying module is respectively connected with the ground wire module and the zero line selection module;
the zero line selection module comprises a selection relay JK2 and a zero line output terminal OUT-N, wherein the selection relay JK2 is respectively connected with the controllable rectifying module and the zero line output terminal, and the selection relay JK2 is a single-pole double-throw relay.
The controllable rectifying module in the embodiment of the utility model comprises a first thyristor Q3, a second thyristor Q2 and a sixth capacitor C6;
one end of the first thyristor Q3 is connected with the zero line selection module, and the other end of the first thyristor Q3 is connected with one end of the second thyristor Q2;
the sixth capacitor C6 is arranged between the first thyristor Q3 and the second thyristor Q2 and is grounded;
the other end of the second thyristor Q2 is connected with a ground wire module.
Further, the controllable rectifying module in the embodiment of the utility model further comprises a sixth resistor R6 and an eighth resistor R8;
the sixth resistor R6 is arranged between the second thyristor Q2 and the sixth capacitor C6 and is connected in series with the second thyristor Q2;
and two ends of the eighth resistor R8 are respectively connected with the first thyristor Q3 and the zero line selection module.
The ground wire module in the embodiment of the utility model comprises a fifth capacitor C5, and a fourth capacitor C4, a fourth resistor R4 and a fifth resistor R5 which are sequentially connected in series;
the fourth capacitor C4 is also connected with a ground wire connecting terminal;
the fifth resistor R5 is also connected with the controllable rectifying module;
the fifth capacitor C5 is disposed between the fifth resistor R5 and the controllable rectifying module and grounded.
The live wire zero line judging module further comprises a power supply bias module connected with the controllable rectifying module, wherein the power supply bias module comprises a seventh resistor R7 and a ninth resistor R9, and the ninth resistor R9 is grounded.
Further, the zero line selection module in the embodiment of the utility model further comprises a triode Q1;
the base electrode of the triode Q1 is connected with the controllable rectifying module, the emitting electrode is connected with the ground, and the collecting electrode is connected with the selection relay JK 2.
In order to realize the open circuit protection, the embodiment of the utility model further comprises a power-off protection module connected in series with the power supply, wherein a circuit of the power-off protection module is shown in fig. 4 and comprises a first relay JK1, a second resistor R2 connected in series with the first relay JK1 and a diode D2 connected in parallel with the first relay JK 1. The first relay JK1 is a double-pole single-throw relay.
Further, the power module according to the embodiment of the utility model further comprises a voltage stabilizing unit and a rectifying unit which are connected in parallel. Wherein the voltage stabilizing unit comprises 2 voltage stabilizing diodes connected in series, such as ZD1 and ZD2 in fig. 1, and the rectifying unit comprises 2 rectifying diodes connected in series, such as D3 and D4 in fig. 1.
When two wiring terminals on the power supply module are respectively connected with a live wire and a zero line, 220V alternating current is filtered by the safety capacitor C1, the voltage stabilizing unit and the rectifying unit, a 12V direct current power supply is output to supply power to the first relay JK1, the selection relay JK2 and the live wire zero line judging module, when the middle 220V_B in the figure 1 is connected with the zero line, the potential of the zero line is the same as the ground wire, so that the potential of PE (ground wire) is smaller than the conducting voltage of the second thyristor Q2, the second thyristor Q2 does not work, a low level is output, the selection relay JK2 does not work, and the zero line output terminal OUT-N outputs 220V_B.
When 220V_A is zero line, the potential of zero line is the same as the ground line, so PE (ground line) is larger than the conducting voltage of the second thyristor Q2, at the moment, the high level is output, and the sixth capacitor C6 is charged, when 220V is a negative half axis, the output of the second thyristor Q2 is low, the high level is maintained by the sixth capacitor C6, and the output is high continuously. At this time, the selection relay JK2 is switched to output 220V_A to complete zero line selection.
When the power supply of the system is interrupted, the first relay JK1 is disconnected with 220V to ensure that the zero line and the live line on the product are completely separated from the 220V power supply system.
The automatic zero line selector can connect the live wire, the zero line and the ground wire on the three wiring terminals arranged on the power supply module under the condition of power failure, so that the electric shock hazard can be avoided, and meanwhile, the zero line output terminal is automatically connected to the zero line through the selection relay according to the state of being connected to the zero live wire terminal, so that the automatic zero line selector is simple, convenient and high in accuracy.
While the utility model has been described in terms of preferred embodiments, it will be understood by those skilled in the art that various changes and modifications can be made without departing from the scope of the utility model, and it is intended that the utility model is not limited to the specific embodiments disclosed.
Claims (9)
1. An automatic zero line selector is characterized by comprising a power supply module, a live wire zero line judging module and a zero line selecting module which are connected in series with the power supply module;
three wiring terminals are arranged on the power supply module, wherein two wiring terminals are respectively connected with a live wire and a zero wire to be selected, and the other wiring terminal is grounded;
the live wire zero line judging module comprises a controllable rectifying module and a ground wire module; the controllable rectifying module is respectively connected with the ground wire module and the zero line selection module;
the zero line selection module comprises a selection relay and a zero line output terminal, and the selection relay is respectively connected with the controllable rectifying module and the zero line output terminal.
2. The automatic neutral wire selector of claim 1, wherein the controllable rectifying module comprises a first thyristor, a second thyristor, and a sixth capacitor;
one end of the first thyristor is connected with the zero line selection module, and the other end of the first thyristor is connected with one end of the second thyristor;
the sixth capacitor is arranged between the first thyristor and the second thyristor and grounded;
the other end of the second thyristor is connected with the ground wire module.
3. The automatic neutral wire selector of claim 2, wherein the controllable rectifying module further comprises a sixth resistor and an eighth resistor;
the sixth resistor is arranged between the second thyristor and the sixth capacitor and is connected in series with the second thyristor;
and two ends of the eighth resistor are respectively connected with the first thyristor and the zero line selection module.
4. The automatic neutral line selector of claim 1, wherein the ground line module comprises a fifth capacitor and a fourth capacitor, a fourth resistor, and a fifth resistor connected in series in sequence;
the fourth capacitor is also connected with a ground wire connecting terminal;
the fifth resistor is also connected with the controllable rectifying module;
the fifth capacitor is arranged between the fifth resistor and the controllable rectifying module and grounded.
5. The automatic neutral wire selector of claim 1, wherein the neutral wire selection module further comprises a triode;
and the base electrode of the triode is connected with the controllable rectifying module, the emitting electrode of the triode is connected with the ground, and the collecting electrode of the triode is connected with the selection relay.
6. The automatic neutral line selector of claim 1, further comprising a power-off protection module in series with the power supply;
the power-off protection module comprises a first relay, a second resistor connected in series with the first relay and a diode connected in parallel with the first relay.
7. The automatic neutral wire selector of claim 6, wherein the first relay is a double pole single throw relay.
8. The automatic neutral wire selector of claim 1, wherein the power supply module further comprises a voltage stabilizing unit and a rectifying unit connected in parallel.
9. The automatic neutral wire selector of claim 1, wherein the selection relay is a single pole double throw relay.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320994352.8U CN219871732U (en) | 2023-04-27 | 2023-04-27 | Automatic zero line selector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320994352.8U CN219871732U (en) | 2023-04-27 | 2023-04-27 | Automatic zero line selector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219871732U true CN219871732U (en) | 2023-10-20 |
Family
ID=88370178
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320994352.8U Active CN219871732U (en) | 2023-04-27 | 2023-04-27 | Automatic zero line selector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219871732U (en) |
-
2023
- 2023-04-27 CN CN202320994352.8U patent/CN219871732U/en active Active
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