CN110635455A - Safety protection device for leakage protection and power connection protection - Google Patents
Safety protection device for leakage protection and power connection protection Download PDFInfo
- Publication number
- CN110635455A CN110635455A CN201911023968.5A CN201911023968A CN110635455A CN 110635455 A CN110635455 A CN 110635455A CN 201911023968 A CN201911023968 A CN 201911023968A CN 110635455 A CN110635455 A CN 110635455A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/26—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents
- H02H3/32—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors
Abstract
The invention discloses a safety protection device for leakage protection and power connection protection, which belongs to the technical field of safety protection and comprises a bottom box and a switch panel, wherein the bottom of the switch panel is clamped with the top of the bottom box; the main body part of the invention is integrated in the 86 type switch panel and the 86 type bottom box, so that the common 86 type socket panel in families and offices can be directly replaced, the Hall sensor measures the current and voltage by measuring the magnetic field intensity for electric shock and electric leakage protection, and a reliable distributed safe power utilization system is obtained by electric shock and electric leakage protection on the switch panel.
Description
Technical Field
The invention relates to the technical field of safety protection, in particular to a safety protection device for leakage protection and power connection protection.
Background
The safety protection of the existing household circuit mainly depends on an air switch and a leakage protector. The air switch is arranged on a circuit bus, and when the current flowing through the air switch reaches the maximum value of the air switch, the air switch is automatically switched off, and the air switch in the figure allows the maximum 32A current to pass through.
It is obvious that the air switch has the disadvantage that it cannot be protected by a splitter. All electrical appliances are connected in parallel and then pass through the air switch, and the protective current can be bigger, has the risk of local overcurrent. If the allowable current of the air switch is set to be relatively small, the air switch cannot be normally used. In a small load such as a charger, the short-circuit current is several amperes, and the air switch does not operate, or there is a risk of burning out a fire.
The leakage protector is also installed on the zero line and the live line of the circuit bus. The earth leakage protector constantly measures the current flowing out of the switch and the current flowing back into the switch. When the difference value of the two currents is larger than a value, the leakage protector automatically cuts off the circuit. This current is typically 30 mA. Of course, the leakage protector will also break the circuit after the current through the switch is greater than the maximum allowed value, as with an air switch. When the current difference between the zero line and the live line is too large, a part of current does not flow back to a power supply, but leaks, and the condition is that either system leakage or electric shock occurs.
Modern switching power supply circuits, such as notebook computers, liquid crystal televisions, etc., generally have an X capacitor and a Y capacitor. The two capacitors are directly connected to the ground line to release the interference waves in the circuit. That is, a weak current is generated to the ground. A large number of such appliances add up to a relatively large current. That is, the judgment of the earth leakage protector is interfered, and the earth leakage protector used for the overall circuit needs to set a relatively large earth leakage current, which is generally set to 30mA, so that the actual safety is not particularly ideal. The human body safe voltage is 36V, and the safe current is 10 mA. The degree of harm of electric shock to human body mainly depends on the magnitude of current passing through human body and the length of power-on time. The greater the current intensity, the greater the risk of mortality; the longer the duration, the greater the likelihood of death. The minimum current value which can cause people to feel is called sensing current, the alternating current is 1mA, and the direct current is 5 mA; the maximum current that a person can get rid of after getting an electric shock is called the free current, the alternating current is 10mA, and the direct current is 50 mA. It is still not particularly safe to set at a leakage current of 30 mA.
The electricity for daily life is generally from 86 type socket panel. Many 86-type switch panels are installed in homes or on walls of offices. Generally, each panel is connected to only one electrical appliance, or a group of electrical appliances that need to operate simultaneously, such as a computer host and a display. If the safety protection device is designed on a 86-type socket panel which is commonly used in households and offices. A reliable distributed safety power utilization system can be obtained by arranging leakage protection, overcurrent protection and grounding protection in a socket panel. Based on this, the invention designs a safety protection device for leakage protection and power connection protection to solve the above problems.
Disclosure of Invention
The present invention is directed to a safety protection device for leakage protection and power connection protection, so as to solve the problems mentioned in the background art.
In order to achieve the purpose, the invention provides the following technical scheme: a safety protection device for leakage protection and power connection protection comprises a bottom box and a switch panel, wherein the bottom of the switch panel is clamped with the top of the bottom box, an isolation protection power supply, leakage protection, overcurrent protection, ground protection, a solid relay, a control circuit and a Hall sensor are arranged in the bottom box, an OLED display screen, a five-hole socket, a parameter setting and resetting knob and a display page turning button are arranged on the switch panel, the control circuit comprises a microcontroller, and the microcontroller continuously reads a measured current value and a measured voltage value of a measuring circuit;
the input loop and the output loop of the isolation protection power supply transmit electric energy through a magnetic field by utilizing an electromagnetic induction principle, so that not only can the safety be improved, but also the anti-interference performance is improved;
overcurrent protection, wherein the Hall sensor is designed to measure live wire current and zero line current, the Hall sensor is utilized to measure the magnetic field around the electrified lead, the stronger the magnetic field is, the larger the current is, and a lead is arranged in the Hall chip, namely IP + and IP-; vout is used for measuring the analog quantity of the output magnetic field, this analog quantity is in direct proportion to magnitude of current, change the intensity of the measuring magnetic field into the intensity of the measuring current, the said microcontroller calculates the difference between current of live wire and current of zero line continuously, if find the difference of these two currents is too large, cut off the circuit immediately;
and the Hall sensor is designed for measuring the voltage from the live wire to the zero line and the voltage from the live wire to the ground wire, if no electric leakage or electric shock phenomenon occurs, the voltages of the two parts are equal, but if the two voltages are different, the ground wire is broken, or the ground resistance is too large, and at the moment, the microcontroller also cuts off the power supply.
Preferably, the solid-state relay is an isolation circuit, different from a common relay for controlling a large current by a small current, the solid-state relay is isolated by using an optical signal, the solid-state relay is not directly connected to a physical circuit, and when the system pushes the OLED display screen to emit light, the alternating current circuit is switched on, otherwise, the alternating current circuit is switched off, so that the effect of switching off and switching on the control circuit is achieved, and the danger caused by the electric leakage of the system from the relay can be prevented.
Preferably, the control circuit is provided with a high-sensitivity alternating current measuring circuit, a grounding detection circuit and an isolation electronic switch.
Preferably, the alternating current measuring circuit accurately measures the current and voltage flowing through the zero line and the live line.
Preferably, the isolation electronic switch adopts an optical coupler-driven biphase silicon controlled circuit, and the control signal is controlled by light and no light, so that the safety isolation is realized.
Preferably, the parameter setting and resetting knob is used as a resetting button through the parameter setting and resetting knob at the same time, and is used for exiting the protection state.
Preferably, the page turning button is pressed, the OLED display screen sequentially displays current, voltage, power and current settings, indicates whether the current working state is in a safety protection state, the maximum allowable current can be set on a current setting interface, and the parameter setting and resetting knob can set a specific maximum current value.
Compared with the prior art, the invention has the beneficial effects that: the invention can directly replace the common 86-type socket panel in families and offices by integrating the main body part in the 86-type switch panel and the 86-type bottom box, the Hall sensor measures the current and the voltage by measuring the magnetic field intensity for electric shock and electric leakage protection, a reliable distributed safe power utilization system is obtained by electric shock and electric leakage protection on the switch panel, and the distributed safe power utilization system is provided with a small OLED display screen, is used for indicating whether the current working state is in a safety protection state, the parameter setting and resetting knob can set a specific maximum current value, the microcontroller continuously reads the measured current value and the voltage value of the measuring circuit, if the total current exceeds a set value, the current difference between the zero line and the live line is too large, and the voltage from the live line to the zero line and the voltage from the live line to the ground line are not equal, the circuit is immediately cut off, and the circuit can be switched on again only after the reset key is pressed again.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic view of the structure of the present invention.
Fig. 2 is a schematic structural diagram of a switch panel according to the present invention.
FIG. 3 is a control circuit diagram of the present invention.
Fig. 4 is a circuit diagram of the current and voltage measurement based on the hall sensor according to the present invention.
In the drawings, the components represented by the respective reference numerals are listed below:
1-bottom box, 2-switch panel, 3-isolation protection power supply, 4-leakage protection, 5-overcurrent protection, 6-ground protection, 7-solid relay, 8-control circuit, 9-Hall sensor, 10-OLED display screen, 11-five-hole socket, 12-parameter setting and resetting knob and 13-display page turning button.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-4, the present invention provides a technical solution: a safety protection device for leakage protection and power connection protection comprises a bottom box 1 and a switch panel 2, wherein the bottom of the switch panel 2 is clamped with the top of the bottom box 1, an isolation protection power supply 3, leakage protection 4, overcurrent protection 5, ground protection 6, a solid relay 7, a control circuit 8 and a Hall sensor 9 are arranged in the bottom box 1, the control circuit 8 comprises a microcontroller, the microcontroller continuously reads a detected current value and a voltage value of a measurement circuit, a high-sensitivity alternating current measurement circuit, a ground detection circuit and an isolation electronic switch are designed in the control circuit 8, the alternating current measurement circuit accurately measures current and voltage flowing through a zero line and a live line, the Hall sensor 9 is adopted to measure a magnetic field around an electric wire in a specific implementation method, the stronger the magnetic field, the larger the current, the isolation electronic switch adopts an optical coupler-driven two-phase controllable silicon circuit, the control signal is controlled by light or no light, so that safety isolation is realized, if the total current exceeds a set value, the circuit is cut off, if the difference between the zero line current and the live line current is too large, the current is cut off, and the circuit can be switched on again after the reset key is pressed again;
be equipped with OLED display screen 10 on flush mounting plate 2, five hole sockets 11, parameter setting and reset knob 12 and show and turn over a page or leaf button 13, parameter setting and reset knob 12 is as reset button simultaneously through parameter setting and reset knob for withdraw from the protected state, show that turn over a page or leaf button 13 presses and turns over a page or leaf key, OLED display screen 10 shows current in proper order, voltage, power and current setting, indicate whether current operating condition is in the safety protection state, can set up the maximum current that allows at the current setting interface, parameter setting and reset knob 12 can set up specific maximum current value.
The bottom box 1 and the switch panel 2 are respectively a 86-type bottom box and a 86-type switch panel, and the parts are integrated in the 86-type switch panel and the 86-type bottom box, so that the common 86-type socket panel in families and offices can be directly replaced.
The system uses the isolation protection power supply 3 to supply power, and ensures that the switch does not leak electricity. The isolation protection power supply 3 is an isolation circuit which is not directly connected with high-voltage alternating current, and the energy of the circuit is transmitted through a magnetic field to prevent electric shock accidents.
When the device works, the alternating current measuring circuit adopts the Hall sensor to accurately measure the current flowing through the zero line and the live line and the voltages of the live line and the zero line as well as the live line and the grounding line.
The leakage protection 4 is characterized in that an input loop and an output loop of the isolation protection power supply 3 are not directly electrically connected, the input and the output are in an insulated high-resistance state and do not have a current loop, the low-voltage output and the alternating current input are not directly connected, the switch is ensured not to leak electricity, the input loop and the output loop of the isolation protection power supply 3 transmit electric energy through a magnetic field by utilizing the electromagnetic induction principle, and not only can the safety be improved, but also the anti-interference performance is improved;
the grounding protection 6 and the Hall sensor 9 are designed to measure the voltage from the live wire to the zero line and the voltage from the live wire to the ground wire, if no electric leakage or electric shock phenomenon occurs, the voltages of the two parts are equal, but if the two voltages are different, the ground wire is broken, or the ground resistance is too large, and at the moment, the microcontroller can cut off the power supply.
The solid relay 7 is an isolation circuit, different from a common relay for controlling large current by small current, the solid relay 7 is isolated by using an optical signal, and is not directly connected with a physical circuit, when the system pushes the OLED display screen 10 to emit light, an alternating current circuit is switched on, otherwise, the system is switched off, so that the effect of switching off and switching on the control circuit is achieved, and the danger caused by electric leakage of the system from the relay can be prevented.
When electric leakage, undervoltage, overvoltage, overcurrent and poor grounding occur, the system can automatically cut off the power supply, display the specific fault reason on the OLED display screen 10, and can re-supply power according to the parameter/reset knob after the fault is eliminated.
The control mode of the invention is automatically controlled by a microcontroller, and the control circuit of the microcontroller can be realized by simple programming of a person skilled in the art, so the control mode and the circuit connection are not explained in detail in the invention.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (7)
1. The utility model provides a leakage protection, connect electric protection's safety arrangement, includes end box (1) and flush mounting plate of switch (2), its characterized in that: the bottom of the switch panel (2) is clamped with the top of the bottom box (1), an isolation protection power supply (3), a leakage protection (4), an overcurrent protection (5), a grounding protection (6), a solid relay (7), a control circuit (8) and a Hall sensor (9) are arranged in the bottom box (1), an OLED display screen (10), a five-hole socket (11), a parameter setting and resetting knob (12) and a display page turning button (13) are arranged on the switch panel (2), the control circuit (8) comprises a microcontroller, and the microcontroller continuously reads a measured current value and a measured voltage value of the measuring circuit;
the leakage protection circuit comprises a leakage protection circuit (4), wherein an input circuit and an output circuit of the isolation protection power supply (3) are not directly electrically connected, the input circuit and the output circuit are in an insulated high-resistance state and are not provided with a current circuit, and a low-voltage output circuit and an alternating current input circuit are not directly connected, so that the leakage of the switch is avoided, the input circuit and the output circuit of the isolation protection power supply (3) utilize the electromagnetic induction principle, electric energy is transmitted through a magnetic field, and not only is the safety improved, but also the anti-interference performance is improved;
the over-current protection device comprises an over-current protection device (5), wherein a Hall sensor (9) is designed to measure live wire current and zero line current, the Hall sensor (9) is used for measuring a magnetic field around a power-on wire, the stronger the magnetic field is, the larger the current is, and a wire, namely IP + and IP-, is arranged in a Hall chip; vout is used for measuring the analog quantity of the output magnetic field, this analog quantity is in direct proportion to magnitude of current, change the intensity of the measuring magnetic field into the intensity of the measuring current, the said microcontroller calculates the difference between current of live wire and current of zero line continuously, if find the difference of these two currents is too large, cut off the circuit immediately;
and the Hall sensor (9) is designed to measure the voltage from the live wire to the zero line and the voltage from the live wire to the ground wire, if no electric leakage or electric shock phenomenon occurs, the two voltages are equal, but if the two voltages are different, the ground wire is broken or the ground resistance is too large, and the microcontroller also cuts off the power supply.
2. A leakage protection and power connection protection safety protection device according to claim 1, wherein: the solid relay (7) is an isolation circuit, different from a common relay for controlling large current by small current, the solid relay (7) is isolated by using an optical signal, and is not directly connected to a physical circuit, so that when the system pushes the OLED display screen (10) to emit light, an alternating current circuit is switched on, otherwise, the system is switched off, the effect of switching off and switching on the control circuit is achieved, and the danger caused by electric leakage of the system from the relay can be prevented.
3. A leakage protection and power connection protection safety protection device according to claim 1, wherein: and an alternating current measuring circuit with high sensitivity, a grounding detection circuit and an isolation electronic switch are designed in the control circuit (8).
4. A leakage protection and power connection protection safety protection device according to claim 3, wherein: the alternating current measuring circuit accurately measures the current and the voltage flowing through the zero line and the live line.
5. A leakage protection and power connection protection safety protection device according to claim 3, wherein: the isolation electronic switch adopts a double-phase silicon controlled circuit driven by an optical coupler, and control signals are controlled by light and no light, so that safe isolation is realized.
6. A leakage protection and power connection protection safety protection device according to claim 1, wherein: the parameter setting and resetting knob (12) is used as a resetting button through the parameter setting and resetting knob at the same time and is used for quitting the protection state.
7. A leakage protection and power connection protection safety protection device according to claim 1, wherein: the display page turning button (13) presses a page turning key, the OLED display screen (10) sequentially displays current, voltage, power and current settings, indicates whether the current working state is in a safety protection state, can set the allowed maximum current on a current setting interface, and the parameter setting and resetting knob (12) can set a specific maximum current value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911023968.5A CN110635455A (en) | 2019-10-25 | 2019-10-25 | Safety protection device for leakage protection and power connection protection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911023968.5A CN110635455A (en) | 2019-10-25 | 2019-10-25 | Safety protection device for leakage protection and power connection protection |
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| Publication Number | Publication Date |
|---|---|
| CN110635455A true CN110635455A (en) | 2019-12-31 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911023968.5A Pending CN110635455A (en) | 2019-10-25 | 2019-10-25 | Safety protection device for leakage protection and power connection protection |
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| Country | Link |
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| CN (1) | CN110635455A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113517676A (en) * | 2021-05-06 | 2021-10-19 | 东方电子股份有限公司 | Method for preventing power frequency magnetic field from interfering bus differential protection under slight fault situation |
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|---|---|---|---|---|
| CN202057749U (en) * | 2011-05-17 | 2011-11-30 | 李英岱 | Instrument for detecting and displaying ground state of equipment or socket |
| CN203166238U (en) * | 2013-01-25 | 2013-08-28 | 谭立锋 | Socket for realizing leakage protection |
| CN203367664U (en) * | 2013-07-22 | 2013-12-25 | 张丽丽 | Leakage protection socket |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113517676A (en) * | 2021-05-06 | 2021-10-19 | 东方电子股份有限公司 | Method for preventing power frequency magnetic field from interfering bus differential protection under slight fault situation |
| CN113517676B (en) * | 2021-05-06 | 2022-10-28 | 东方电子股份有限公司 | Method for preventing power frequency magnetic field from interfering bus differential protection under slight fault situation |
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Application publication date: 20191231 |
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