Null line and live line reverse insertion prevention device for alternating current power supply system

Abstract

The utility model relates to the technical field of electrical equipment, and discloses a null line and live line reverse insertion prevention device for an alternating current power supply system, which comprises a first alternating current input end, a second alternating current input end, a first null line and live line reverse insertion prevention module, a second null line and live line reverse insertion prevention module, a first alternating current output end and a second alternating current output end, the first zero and live wire reverse insertion prevention module comprises a first normally open relay, a second normally open relay, a first bridge rectifier module and a first bias voltage module; the first bias voltage module comprises a first divider resistor, a second divider resistor and a first capacitor; the second zero and live wire reverse insertion prevention module comprises a third normally open relay, a fourth normally open relay, a second bridge rectifier module and a second bias voltage module; the second bias voltage module comprises a third divider resistor, a fourth divider resistor and a second capacitor; according to the utility model, automatic correction of reverse connection of the null line and the live line can be realized, and the safety of an AC power supply system is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to electrical equipment technical field, concretely relates to a zero fire line anti -inserting reverse device for alternating current power supply system. BACKGROUND

[0002] In daily electrical equipment, zero fire line connection reverse is a common and potential dangerous error, especially when users wire or non-professional personnel operate. Zero fire line connection reverse not only causes electrical equipment to work abnormally, but also may cause electric shock, fire and other serious safety accidents. Especially in household appliances, high-power electrical appliances or industrial equipment, the risk of zero fire line connection reverse is more significant, which may cause internal circuit damage of electrical appliances, device failure, and even shorten the service life of the device.

[0003] In addition, the zero fire line connection reverse condition is often difficult for ordinary users to detect, and even if the electrical appliance can continue to be used for a short period of time, the wrong wiring method greatly increases the use risk and exists fatal safety hazards. For example, the live wire connected to the zero line port may make the device shell charged, which may cause electric shock when touched, especially in a humid environment, the risk is more serious. On the other hand, many existing electrical devices and sockets lack effective anti-reverse design and cannot automatically detect and correct the zero fire line connection reverse error, often relying on manual inspection or correction.

[0004] Therefore, there is an urgent need in the market for a device that can automatically detect and correct the zero fire line connection reverse problem. Such a device not only improves user safety, reduces electrical failures and accidents, but also prolongs the service life of electrical equipment and avoids long-term damage caused by connection reverse. SUMMARY

[0005] In view of the above deficiencies in the prior art, the utility model provides a zero fire line anti-inserting reverse device for alternating current power supply system, which solves the problem of existing electrical devices and sockets relying on manual inspection or correction of zero fire line connection reverse. Through the zero fire line anti-inserting reverse device, the zero fire line connection reverse problem is automatically detected and corrected, the user's safety is improved, the electrical failures and accidents are reduced, and the service life of the electrical equipment is prolonged, avoiding long-term damage caused by connection reverse.

[0006] In order to achieve the above invention purposes, the utility model adopts the technical scheme:

[0007] A zero-live-line anti-reverse plug device for an alternating current power supply system, comprising: a first alternating current input end, a second alternating current input end, a first zero-live-line anti-reverse plug module, a second zero-live-line anti-reverse plug module, a first alternating current output end, a second alternating current output end; the first zero-live-line anti-reverse plug module comprises a first normally open relay and a second normally open relay; the second zero-live-line anti-reverse plug module comprises a third normally open relay and a fourth normally open relay; the first alternating current input end is connected with the first zero-live-line anti-reverse plug module, and the second alternating current input end is connected with the second zero-live-line anti-reverse plug module;

[0008] The first alternating current input end is connected with the zero line or the live line in any line sequence, and when the first alternating current input end is connected with the live line, the second alternating current input end is connected with the zero line; and when the first alternating current input end is connected with the zero line, the second alternating current input end is connected with the live line;

[0009] When the first alternating current input end is connected with the live line and the second alternating current input end is connected with the zero line, the first normally open relay and the second normally open relay are turned on, a first switch of the first normally open relay and a second switch of the second normally open relay are closed, the first alternating current input end is connected with the first alternating current output end through the first switch, the third normally open relay and the fourth normally open relay are blocked, a third switch of the third normally open relay and a fourth switch of the fourth normally open relay are opened, and the second alternating current input end is connected with the second alternating current output end through the second switch;

[0010] When the first alternating current input end is connected with the zero line and the second alternating current input end is connected with the live line, the first normally open relay and the second normally open relay are blocked, the first switch of the first normally open relay and the second switch of the second normally open relay are opened, the third normally open relay and the fourth normally open relay are turned on, the third switch of the third normally open relay and the fourth switch of the fourth normally open relay are closed, the second alternating current input end is connected with the first alternating current output end through the third switch, and the first alternating current input end is connected with the second alternating current output end through the fourth switch.

[0011] Further, the first zero-live-line anti-reverse plug module further comprises a first bridge rectifier module and a first bias voltage module;

[0012] The first bias voltage module comprises a first voltage dividing resistor, a second voltage dividing resistor and a first capacitor;

[0013] The first input end of the first bridge rectifier module is connected with the first alternating current input end, the second input end of the first bridge rectifier module is grounded, the first output end of the first bridge rectifier module is connected with the input end of the first voltage dividing resistor, the output end of the first voltage dividing resistor is connected with the input end of the second voltage dividing resistor, one end of the first capacitor, the first control end of the first normally open relay and the first control end of the second normally open relay respectively, and the output end of the second voltage dividing resistor is connected with the second output end of the first bridge rectifier module, the other end of the first capacitor, the second control end of the first normally open relay and the second control end of the second normally open relay respectively.

[0014] Further, the second zero fire line anti-reverse insertion module further comprises a second bridge rectifier module and a second bias voltage module.

[0015] The second bias voltage module comprises a third voltage dividing resistor, a fourth voltage dividing resistor and a second capacitor.

[0016] The first input end of the second bridge rectifier module is connected with the second alternating current input end, the second input end of the second bridge rectifier module is grounded, the first output end of the second bridge rectifier module is connected with the input end of the third voltage dividing resistor, the output end of the third voltage dividing resistor is connected with the input end of the fourth voltage dividing resistor, one end of the second capacitor, the first control end of the third normally open relay and the first control end of the fourth normally open relay respectively, and the output end of the fourth voltage dividing resistor is connected with the second output end of the second bridge rectifier module, the other end of the second capacitor, the second control end of the third normally open relay and the second control end of the fourth normally open relay respectively.

[0017] Further, the first normally open relay, the second normally open relay, the third normally open relay and the fourth normally open relay are solid state relays.

[0018] Further, the first bridge rectifier module and the second bridge rectifier module are GBPC3510 rectifier bridges.

[0019] The utility model has the following beneficial effects:

[0020] 1. The zero fire line anti-reverse insertion device for the alternating current power supply system can realize automatic correction, that is, the device can monitor the connection state of the zero fire line in real time through the built-in automatic detection and correction mechanism, and automatically adjusts the circuit output according to the actual access condition, without the need for manual operation of the user, so that the operation is convenient, and the risk of equipment damage caused by reverse connection is greatly reduced; at the same time, the alternating current power supply system has high fault tolerance, can automatically correct the output voltage in the case of zero fire line reverse connection, and ensures the safe use of the equipment.

[0021] 2. It features high safety, namely, through reverse connection protection design, it can effectively identify and handle situations where the live and neutral wires are reversed, avoiding equipment damage, electrical fires or other safety accidents caused by incorrect voltage polarity; this design can significantly improve the safety of system operation and ensure stability during use, preventing serious consequences due to wiring errors;

[0022] 3. Wide applicability: This device has broad application prospects. It is not only suitable for household appliances (such as air conditioners, refrigerators, washing machines, etc.), but also for various industrial equipment, power systems, and other scenarios that require ensuring the correct connection of the live and neutral wires. Its design is simple, economical, and efficient, and can meet the needs of various devices, improving the overall reliability of electrical systems. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of a device for preventing reverse insertion of the neutral and live wires in an AC power system, as proposed in this utility model. Detailed Implementation

[0024] The specific embodiments of this utility model are described below to enable those skilled in the art to understand this utility model. However, it should be understood that this utility model is not limited to the scope of the specific embodiments. For those skilled in the art, as long as various changes are within the spirit and scope of this utility model as defined and determined by the appended claims, these changes are obvious. All inventions utilizing the concept of this utility model are protected.

[0025] like Figure 1 As shown, a device for preventing reverse insertion of live and neutral wires in an AC power system includes: a first AC input terminal, a second AC input terminal, a first reverse insertion module for preventing live and neutral wires, a second reverse insertion module for preventing live and neutral wires, a first AC output terminal, and a second AC output terminal; the first reverse insertion module for preventing live and neutral wires includes a first normally open relay and a second normally open relay; the second reverse insertion module for preventing live and neutral wires includes a third normally open relay and a fourth normally open relay; the first AC input terminal is connected to the first reverse insertion module for preventing live and neutral wires, and the second AC input terminal is connected to the second reverse insertion module for preventing live and neutral wires.

[0026] The first AC input terminal is connected to either the neutral or live wire in any wiring order. When the first AC input terminal is connected to the live wire, the second AC input terminal is connected to the neutral wire. And when the first AC input terminal is connected to the neutral wire, the second AC input terminal is connected to the live wire.

[0027] When the first AC input end is connected to the live wire and the second AC input end is connected to the zero line, the first and second normally open relays are turned on, the first switch of the first normally open relay and the second switch of the second normally open relay are closed, the first AC input end is connected to the first AC output end through the first switch, the third and fourth normally open relays are blocked, the third switch of the third normally open relay and the fourth switch of the fourth normally open relay are opened, and the second AC input end is connected to the second AC output end through the second switch.

[0028] When the first AC input end is connected to the zero line and the second AC input end is connected to the live wire, the first and second normally open relays are blocked, the first switch of the first normally open relay and the second switch of the second normally open relay are opened, the third and fourth normally open relays are turned on, the third switch of the third normally open relay and the fourth switch of the fourth normally open relay are closed, the second AC input end is connected to the first AC output end through the third switch, and the first AC input end is connected to the second AC output end through the fourth switch.

[0029] Specifically, the first zero-live wire anti-reverse insertion module further comprises a first bridge rectifier module and a first bias voltage module; the first bias voltage module comprises a first voltage dividing resistor, a second voltage dividing resistor and a first capacitor; a first input end of the first bridge rectifier module is connected to the first AC input end, a second input end of the first bridge rectifier module is grounded, a first output end of the first bridge rectifier module is connected to an input end of the first voltage dividing resistor, an output end of the first voltage dividing resistor is respectively connected to an input end of the second voltage dividing resistor, one end of the first capacitor, a first control end of the first normally open relay and a first control end of the second normally open relay, and an output end of the second voltage dividing resistor is respectively connected to a second output end of the first bridge rectifier module, the other end of the first capacitor, a second control end of the first normally open relay and a second control end of the second normally open relay.

[0030] Specifically, the second zero fire line anti-insertion reversal module further comprises a second bridge rectifier module and a second bias voltage module; the second bias voltage module comprises a third voltage dividing resistor, a fourth voltage dividing resistor and a second capacitor; a first input end of the second bridge rectifier module is connected with the second AC input end, a second input end of the second bridge rectifier module is grounded, a first output end of the second bridge rectifier module is connected with an input end of the third voltage dividing resistor, output ends of the third voltage dividing resistor are respectively connected with an input end of the fourth voltage dividing resistor, one end of the second capacitor, a first control end of the third normally open relay and a first control end of the fourth normally open relay, and output ends of the fourth voltage dividing resistor are respectively connected with a second output end of the second bridge rectifier module, the other end of the second capacitor, a second control end of the third normally open relay and a second control end of the fourth normally open relay.

[0031] Specifically, the first normally open relay, the second normally open relay, the third normally open relay and the fourth normally open relay are solid state relays.

[0032] In the embodiment, the first normally open relay, the second normally open relay, the third normally open relay and the fourth normally open relay are preferably solid state relays, and the specific model can be selected according to the maximum working current of the load. In the embodiment, the model SSR-40DA is selected.

[0033] Specifically, the first bridge rectifier module and the second bridge rectifier module are both GBPC3510 rectifier bridges.

[0034] In the embodiment, Figure 1The shown 1 is a first AC input, 2 is a second AC input, 3 is a first bridge rectifier module, 4 is a second bridge rectifier module, 5 is a first voltage dividing resistor, 6 is a second voltage dividing resistor, 7 is a third voltage dividing resistor, 8 is a fourth voltage dividing resistor, 9 is a first capacitor, 10 is a second capacitor, 11 is a first normally open relay, 12 is a second normally open relay, 13 is a third normally open relay, 14 is a fourth normally open relay, 15 is a first AC output, 16 is a second AC output; wherein, 3, 5, 6, 9, 11, 12 constitute a first zero fire line anti-reverse plug module, 4, 7, 8, 10, 13, 14 constitute a second zero fire line anti-reverse plug module, 5, 6, 9 constitute a first bias voltage module, 7, 8, 10 constitute a second bias voltage module; In addition, in the work, each AC input is connected to the zero line or the fire line in any line sequence, based on this wiring line sequence, the bridge rectifier module connected with the fire line will have a rectification effect, that is, the output end of the first bridge rectifier module 3 or the second bridge rectifier module 4 connected with the fire line will have a unidirectional fluctuating DC voltage output, and after passing through the rectifier bridge, the waveform of the output voltage will be a pulsating DC waveform, that is, the negative half cycle of the AC power is reversed, so that the output voltage is always positive, at this time, the first bridge rectifier module 3 or the second bridge rectifier module 4 connected with the zero line does not work, and there is no voltage output at the output end thereof; At the same time, the output ends of the first bridge rectifier module 3 and the second bridge rectifier module 4 are respectively connected with the first voltage dividing resistor 5, the second voltage dividing resistor 6 and the third voltage dividing resistor 7, the fourth voltage dividing resistor 8 in series to form a loop, and the two resistors in the series circuit in the working state play a voltage dividing role, since the voltage output after the 220V AC power passes through the rectifier bridge is a pulsating DC waveform of 0V-311V (that is, the negative half cycle of the AC power is reversed, so that the output voltage is always positive), in order to obtain a stable voltage for driving the subsequent normally open relays, the resistance values of the first voltage dividing resistor 5 and the third voltage dividing resistor 7 are about 26 times of those of the third voltage dividing resistor 7 and the fourth voltage dividing resistor 8 respectively, and the resistance values of the second voltage dividing resistor 6 and the fourth voltage dividing resistor 8 are respectively 4.7KΩ, and the capacitors 9 and 10 are respectively 470μF; In actual application, the first bridge rectifier module 3 or the second bridge rectifier module 4 connected to the fire line will generate a stable bias voltage output across the first capacitor 9 or the second capacitor 10, and the first bridge rectifier module 3 or the second bridge rectifier module 4 connected to the zero line does not work, and there is no bias voltage output across the first capacitor 9 or the second capacitor 10; Therefore, the bias voltage can drive the conduction of the controlled end of the normally open relay, that is, drive the conduction of each switch (first switch S1, second switch S2, third switch S3, fourth switch S4), the following example illustrates the specific working principle of a zero fire line anti-reverse plug device for an AC power supply system, specifically:

[0035] When one side of the first AC input 1 connected with the first bridge rectifier module 3 is connected with the live wire, the first bridge rectifier module 3 works (the second bridge rectifier module 4 does not work because it is connected with the zero line, no voltage output), after the voltage division of the first voltage dividing resistor 5 and the second voltage dividing resistor 6, the DC bias voltage generated at both ends of the first capacitor 9 will be filtered and stabilized, which drives the first normally open relay 11 and the second normally open relay 12, causing the controlled ends of the two relays (i.e. the first switch S1 and the second switch S2) to be turned on at the same time. Since the first AC input 1 is connected with the second AC output 15 through the controlled end of the first normally open relay 11, and the second AC input 2 is connected with the second AC output 16 through the controlled end of the second normally open relay 12, when the first normally open relay 11 and the second normally open relay 12 are controlled to be turned on, the outputs of the first AC output 15 and the second AC output 16 have the same line sequence as the zero and live wires of the first AC input 1 and the second AC input 2, i.e. the first AC output 15 is the live wire and the second AC output 16 is the zero line. Since the second bridge rectifier circuit 4 connected with the second AC input 2 is the zero line, the second bridge rectifier circuit 4 does not work, and the second capacitor 10 has no bias voltage output, thereby keeping the controlled ends of the third normally open relay 13 and the fourth normally open relay 14 open, which has no effect on the first AC output 15 and the second AC output 16.

[0036] Conversely, when one side of the second AC input 2 connected with the second bridge rectifier module 4 is connected with the live wire, the second bridge rectifier module 4 works (the first bridge rectifier module 3 does not work because it is connected with the zero line, no voltage output), after the voltage division of the third voltage dividing resistor 7 and the fourth voltage dividing resistor 8, the DC bias voltage generated at both ends of the second capacitor 10 will be filtered and stabilized, which drives the third normally open relay 13 and the fourth normally open relay 14, causing the controlled ends of the two relays (i.e. the third switch S3 and the fourth switch S4) to be turned on at the same time. Since the first AC input 1 is connected with the second AC output 16 through the controlled end (the fourth switch S4) of the fourth normally open relay 14, and the second AC input 2 is connected with the first AC output 15 through the controlled end (the third switch S3) of the third normally open relay 13, when the third normally open relay 13 and the fourth normally open relay 14 are controlled to be turned on, the outputs of the first AC output 15 and the second AC output 16 have the opposite line sequence as the zero and live wires of the first AC input 1 and the second AC input 2, i.e. the first AC output 15 is the live wire and the second AC output 16 is the zero line.

[0037] Therefore, through the above connection, the first AC output end 15 is always kept as a live wire, and the second AC output end 16 is always kept as a zero wire. In addition, the first AC output end 15 and the second AC output end 16 are used for connecting a load device, so as to ensure that the load device always obtains correct zero-live wire input.

[0038] In summary, the zero-live wire anti-reverse insertion device for the AC power supply system has the following advantages: (1) automatic correction: the device can monitor the connection state of the zero-live wire in real time through the built-in automatic detection and correction mechanism, and automatically adjust the circuit output according to the actual access condition without manual operation, which is convenient to operate and greatly reduces the risk of equipment damage caused by reverse connection; at the same time, the device has high fault tolerance and can automatically correct the output voltage in the case of zero-live wire reverse connection, ensuring the safe use of the equipment; (2) high safety: the anti-reverse connection design can effectively identify and handle the zero-live wire reverse connection situation, avoiding equipment damage, electrical fire or other safety accidents caused by voltage polarity error; this design can significantly improve the safety of system operation and ensure the stability during use, preventing serious consequences caused by wiring errors; (3) wide application range: the device has wide application prospects and is not only suitable for household appliances (such as air conditioners, refrigerators, washing machines, etc.), but also suitable for various industrial equipment, power systems and other scenes that need to ensure correct connection of zero-live wire; the design is simple, economical and efficient, which can meet the needs of various equipment and improve the overall reliability of the electrical system.

[0039] The principle and implementation mode of the utility model are described by the specific embodiments in the utility model, and the above embodiment description is only used to help understand the method and core idea of the utility model; at the same time, for ordinary skilled persons in the art, according to the idea of the utility model, there will be changes in specific implementation mode and application range, and the above description should not be understood as a limitation of the utility model.

[0040] Ordinary skilled persons in the art will realize that the embodiments described herein are used to help readers understand the principle of the utility model and should be understood as the protection scope of the utility model not being limited to such specific statements and embodiments. Ordinary skilled persons in the art can make various other specific modifications and combinations according to the technical inspiration of the utility model without departing from the essence of the utility model, and these modifications and combinations are still within the protection scope of the utility model.

Claims

1. A device for preventing reverse insertion of live and neutral wires in an AC power system, characterized in that, include: First AC input terminal, second AC input terminal, first neutral / live wire anti-reverse insertion module, second neutral / live wire anti-reverse insertion module, first AC output terminal, second AC output terminal; The first neutral-live wire anti-reverse insertion module includes a first normally open relay and a second normally open relay; the second neutral-live wire anti-reverse insertion module includes a third normally open relay and a fourth normally open relay; the first AC input terminal is connected to the first neutral-live wire anti-reverse insertion module, and the second AC input terminal is connected to the second neutral-live wire anti-reverse insertion module. The first AC input terminal is connected to either the neutral or live wire in any wiring order, and when the first AC input terminal is connected to the live wire, the second AC input terminal is connected to the neutral wire; and when the first AC input terminal is connected to the neutral wire, the second AC input terminal is connected to the live wire. When the first AC input terminal is connected to the live wire and the second AC input terminal is connected to the neutral wire, the first normally open relay and the second normally open relay are connected, the first switch of the first normally open relay and the second switch of the second normally open relay are closed, the first AC input terminal is connected to the first AC output terminal through the first switch, the third normally open relay and the fourth normally open relay are disconnected, the third switch of the third normally open relay and the fourth switch of the fourth normally open relay are disconnected, and the second AC input terminal is connected to the second AC output terminal through the second switch. When the first AC input terminal is connected to the neutral wire and the second AC input terminal is connected to the live wire, the first normally open relay and the second normally open relay are blocked, the first switch of the first normally open relay and the second switch of the second normally open relay are disconnected, the third normally open relay and the fourth normally open relay are connected, the third switch of the third normally open relay and the fourth switch of the fourth normally open relay are closed, the second AC input terminal is connected to the first AC output terminal through the third switch, and the first AC input terminal is connected to the second AC output terminal through the fourth switch.

2. The device for preventing reverse insertion of live and neutral wires in an AC power system according to claim 1, characterized in that, The first neutral and live wire anti-reverse insertion module also includes a first bridge rectifier module and a first bias voltage module; The first bias voltage module includes a first voltage divider resistor, a second voltage divider resistor, and a first capacitor; The first input terminal of the first bridge rectifier module is connected to the first AC input terminal, the second input terminal of the first bridge rectifier module is grounded, the first output terminal of the first bridge rectifier module is connected to the input terminal of the first voltage divider resistor, the output terminal of the first voltage divider resistor is connected to the input terminal of the second voltage divider resistor, one end of the first capacitor, the first control terminal of the first normally open relay, and the first control terminal of the second normally open relay, respectively, and the output terminal of the second voltage divider resistor is connected to the second output terminal of the first bridge rectifier module, the other end of the first capacitor, the second control terminal of the first normally open relay, and the second control terminal of the second normally open relay, respectively.

3. The device for preventing reverse insertion of live and neutral wires in an AC power system according to claim 1, characterized in that, The second live-neutral wire anti-reverse insertion module also includes a second bridge rectifier module and a second bias voltage module; The second bias voltage module includes a third voltage divider resistor, a fourth voltage divider resistor, and a second capacitor; The first input terminal of the second bridge rectifier module is connected to the second AC input terminal, the second input terminal of the second bridge rectifier module is grounded, the first output terminal of the second bridge rectifier module is connected to the input terminal of the third voltage divider resistor, the output terminal of the third voltage divider resistor is connected to the input terminal of the fourth voltage divider resistor, one end of the second capacitor, the first control terminal of the third normally open relay, and the first control terminal of the fourth normally open relay, respectively, and the output terminal of the fourth voltage divider resistor is connected to the second output terminal of the second bridge rectifier module, the other end of the second capacitor, the second control terminal of the third normally open relay, and the second control terminal of the fourth normally open relay, respectively.

4. The device for preventing reverse insertion of live and neutral wires in an AC power system according to claim 1, characterized in that, The first normally open relay, the second normally open relay, the third normally open relay, and the fourth normally open relay are all solid-state relays.

5. The device for preventing reverse insertion of live and neutral wires in an AC power system according to claim 2 or 3, characterized in that, Both the first bridge rectifier module and the second bridge rectifier module are GBPC3510 rectifier bridges.

Images