CN109066615B - Broken wire protector for two-core power line - Google Patents
Broken wire protector for two-core power line Download PDFInfo
- Publication number
- CN109066615B CN109066615B CN201811031436.1A CN201811031436A CN109066615B CN 109066615 B CN109066615 B CN 109066615B CN 201811031436 A CN201811031436 A CN 201811031436A CN 109066615 B CN109066615 B CN 109066615B
- Authority
- CN
- China
- Prior art keywords
- circuit
- diode
- output end
- line
- voltage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 230000001012 protector Effects 0.000 title claims abstract description 23
- 230000000087 stabilizing effect Effects 0.000 claims abstract description 31
- 238000006243 chemical reaction Methods 0.000 claims abstract description 26
- 239000003990 capacitor Substances 0.000 claims description 21
- 230000003287 optical effect Effects 0.000 claims description 3
- 239000000126 substance Substances 0.000 description 3
- 238000003763 carbonization Methods 0.000 description 2
- 238000010891 electric arc Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/267—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured for parallel lines and wires
-
- 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
- H02H3/04—Details with warning or supervision in addition to disconnection, e.g. for indicating that protective apparatus has functioned
- H02H3/046—Signalling the blowing of a fuse
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
- H02H7/262—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations involving transmissions of switching or blocking orders
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
- H02H9/042—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage comprising means to limit the absorbed power or indicate damaged over-voltage protection device
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/08—Limitation or suppression of earth fault currents, e.g. Petersen coil
Abstract
The invention discloses a broken wire protector of a two-core power line, which controls the on-off of the two-core power line through a switch control circuit; the power supply current reduces the voltage flowing through the voltage reducing circuit; the step-down power supply current is changed into a direct current power supply through a direct current conversion circuit, the converted direct current power supply is displayed through a display circuit, then a main circuit is connected through a control end of a switch control circuit, and the main circuit is powered on after the main circuit is connected, so that a loop of the control end is continuously powered on; the voltage stabilizing circuit detects the voltage on the connected main line, if the main line cannot be maintained because of open circuit or unstable voltage, the control end loop is disconnected, the power line does not supply power to the following load any more, and arc faults are avoided at the broken line of the two-core power line in time, so that the damage to the household appliance or the load at the rear end is avoided, the fire disaster is avoided, unnecessary property loss or casualties are avoided, and the use safety of the household appliance is improved.
Description
Technical Field
The invention relates to a power line protector, in particular to a broken line protector of a two-core power line.
Background
With the widespread use of household appliances, the input power line of the household appliance is broken by the middle wire caused by various reasons such as bending and extrusion. After the household electrical appliance is powered on, the broken position of the power line can continuously pull up the electric arc, thereby generating phenomena of high heat, carbonization of an insulating layer and the like. This phenomenon is light and damages the home appliances at the rear end, and heavy and may ignite the surrounding inflammable substances, thereby causing a fire. The fire disaster caused by arc faults accounts for more than 60% of electric fire disasters, and serious harm is caused to the production and life of people. In view of this, there is a need for a safety device that can better protect people's home appliances from use without increasing the cost of too many production facilities.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: after the household electrical appliance is powered on, the broken position of the power line can continuously pull up the electric arc so as to generate phenomena of high heat, carbonization of an insulating layer and the like; the invention provides a broken wire protector for a two-core power wire, which solves the problem that the phenomenon is light and damages a household appliance at the rear end and the surrounding inflammable substances can be ignited to cause fire.
The invention is realized by the following technical scheme:
the broken line protector of the two-core power line comprises the two-core power line, a switch control circuit, a voltage reduction circuit, a direct current conversion circuit, a voltage stabilizing circuit and an indication circuit, wherein two lines of the two-core power line are used as main lines, and the main lines are a line A and a line B respectively; the switch control circuit is connected with the line A, the line B and the indication circuit; the input end of the switch control circuit is connected with a power supply, the output end of the switch control circuit is connected with one end of a circuit A, and the other end of the circuit A is used as the output end of a protector; the input end of the voltage reduction circuit is connected with the circuit A, the output end of the voltage reduction circuit is connected with the input end of the direct current conversion circuit, and the other input end of the direct current conversion circuit is connected with the circuit B; the voltage stabilizing circuit is connected between the line B and the output end of the direct current conversion circuit; the output end of the direct current conversion circuit is also connected with the input end of the indicating circuit, and the output end of the indicating circuit is connected with the control end of the switch control circuit. The on-off of the two-core power line is controlled by a switch control circuit; the power supply current reduces the voltage flowing through the voltage reducing circuit; the step-down alternating current power supply is changed into a direct current power supply through a direct current conversion circuit, the converted direct current power supply is displayed through a display circuit, then a main circuit is connected through a control end of a switch control circuit, and the main circuit is powered after the main circuit is connected, so that a loop of the control end is continuously powered, and the switch control circuit is ensured to be in a closed state; the voltage stabilizing circuit detects the voltage on the connected main line, if the main line cannot be maintained because of open circuit or unstable voltage, the control end loop is disconnected, the indicating lamp of the indicating circuit is turned off, the switch control circuit is disconnected, the power line does not supply power to the rear load any more, so that the power supply is automatically disconnected in time when the wires in the two-core power line are disconnected, the rear load of the two-core power line is protected, arc faults are avoided in time at the disconnection position of the two-core power line, the damage to the household appliances or the loads at the rear end is avoided, or fires are caused by igniting inflammables around, unnecessary property loss or casualties can be avoided, and the use safety of the household appliances is improved.
Furthermore, a piezoresistor Rv is connected in parallel between the power end of the switch control circuit and the line B. When the voltage of the power supply terminal is lower than the threshold value of the piezoresistor Rv, the current flowing through the piezoresistor Rv is extremely small and is equivalent to a closed valve, and when the voltage exceeds UN, the resistance value of the piezoresistor Rv is reduced, so that the current flowing through the piezoresistor Rv is increased sharply to inhibit overvoltage peak values, and damage to sensitive circuit devices in other circuits can be avoided.
Further, the switch control circuit comprises a key switch k and an optocoupler Q1, wherein the input end of the optocoupler Q1 is used as a power end of the switch control circuit, the output end of the optocoupler Q1 is an output end of the switch control circuit, one control end of the optocoupler Q1 is connected with the output end of the display circuit, and the other control end of the optocoupler Q1 is connected with a circuit B; the two ends of the key switch k are respectively connected with the input end and the output end of the optical coupler Q1.
Further, the voltage reduction circuit comprises a resistor R2, a capacitor C1 and a resistor R3, wherein one end of the resistor R2 is connected to the line A, the other end of the resistor R2 is connected with one end of the capacitor C1, and the capacitor C1 is connected with the resistor R3 in parallel; the other end of the capacitor C1 is used as the output end of the voltage reducing circuit.
Further, the direct current conversion circuit comprises a diode D2 and a diode D3, wherein the positive electrode of the diode D2 and the negative electrode of the diode D3 are connected with the output end of the voltage reduction circuit, the negative electrode of the diode D2 is connected with the voltage stabilizing circuit, the voltage stabilizing circuit comprises a voltage stabilizing diode D1 and a capacitor C2, the positive electrode of the voltage stabilizing diode D1 is connected with a circuit B, the negative electrode of the voltage stabilizing diode D1 is connected with the negative electrode of the diode D2, and the capacitor C2 is connected with the voltage stabilizing diode D1 in parallel; the positive electrode of the diode D3 is connected with the circuit B, and the negative electrode of the diode D2 is used as the output end of the direct current conversion circuit. The capacitor C2 is connected in parallel beside the voltage stabilizing diode to absorb the spike pulse to protect the voltage stabilizing diode D1, so that practicability is improved.
Further, the indicating circuit comprises a light emitting diode D4 and a resistor R1, wherein the positive electrode of the light emitting diode D4 is connected with the output end of the direct current converting circuit, the negative electrode of the light emitting diode D4 is connected with one end of the resistor R1, and the other end of the resistor R1 is used as the output end of the indicating circuit. By using the light emitting diode as the indicator light LED, whether the protector is in the starting state or not can be visually seen, the energy consumption of the diode is low, and the protector is prevented from wasting electric energy.
The invention has the following advantages and beneficial effects:
1. the on-off of the two-core power line is controlled by the switch control circuit; the power supply current reduces the voltage flowing through the voltage reducing circuit; the step-down power supply current is changed into a direct current power supply through a direct current conversion circuit, the converted direct current power supply is displayed through a display circuit, then a main circuit is connected through a control end of a switch control circuit, and the main circuit is powered after the main circuit is connected, so that a loop of the control end is continuously powered, and the switch control circuit is ensured to be in a closed state; the voltage stabilizing circuit detects the voltage on the connected main line, if the main line cannot be maintained due to open circuit or unstable voltage, the control end loop is disconnected, the indicating lamp of the indicating circuit is turned off, the switch control circuit is disconnected, the power line does not supply power to the rear load any more, so that the power supply is automatically disconnected in time when the wires in the two-core power line are disconnected, the rear load of the two-core power line is protected, arc faults are avoided in time at the disconnection position of the two-core power line, and accordingly damage to household appliances or loads at the rear end is avoided, or fires are caused by igniting surrounding inflammable substances, unnecessary property loss or casualties can be avoided, and the use safety of the household appliances is improved;
2. according to the invention, the voltage dependent resistor Rv is arranged, so that abnormal overvoltage frequently occurring in the circuit can be restrained, and the circuit is protected from being damaged by overvoltage;
3. according to the invention, the LED is used as the indicator light LED, so that whether the protector is in the starting state or not can be visually seen, the energy consumption of the diode is low, and the protector is prevented from wasting electric energy.
Drawings
The accompanying drawings, which are included to provide a further understanding of embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiments of the invention. In the drawings:
fig. 1 is a schematic circuit structure of the present invention.
Detailed Description
For the purpose of making apparent the objects, technical solutions and advantages of the present invention, the present invention will be further described in detail with reference to the following examples and the accompanying drawings, wherein the exemplary embodiments of the present invention and the descriptions thereof are for illustrating the present invention only and are not to be construed as limiting the present invention.
Example 1
As shown in fig. 1, the broken line protector of the two-core power line comprises the two-core power line, a switch control circuit, a voltage reduction circuit, a direct current conversion circuit, a voltage stabilizing circuit and an indicating circuit, wherein two circuits of the two-core power line are used as main circuits, and the main circuits are a circuit A and a circuit B respectively; the switch control circuit is connected with the line A, the line B and the indication circuit; the input end of the switch control circuit is connected with a power supply, the output end of the switch control circuit is connected with one end of a circuit A, and the other end of the circuit A is used as the output end of a protector; the input end of the voltage reduction circuit is connected with the circuit A, the output end of the voltage reduction circuit is connected with the input end of the direct current conversion circuit, and the other input end of the direct current conversion circuit is connected with the circuit B; the voltage stabilizing circuit is connected between the line B and the output end of the direct current conversion circuit; the output end of the direct current conversion circuit is also connected with the input end of the indicating circuit, and the output end of the indicating circuit is connected with the control end of the switch control circuit.
When in implementation, the input end of the switch control circuit and the connection plug of the line B are connected with a power supply; a piezoresistor Rv is also connected in parallel between the power end of the switch control circuit and the line B; the switch control circuit comprises a key switch k and an optocoupler Q1, wherein the input end of the optocoupler Q1 is used as a power end of the switch control circuit, the output end of the optocoupler Q1 is an output end of the switch control circuit, the control end of the optocoupler Q1 is connected with the output end of the display circuit, and the grounding end of the optocoupler Q1 is connected with a circuit B; the two ends of the key switch k are respectively connected with the input end and the output end of the optical coupler Q1; the voltage reduction circuit comprises a resistor R2, a capacitor C1 and a resistor R3, wherein one end of the resistor R2 is connected to the line A, the other end of the resistor R2 is connected with one end of the capacitor C1, and the capacitor C1 is connected with the resistor R3 in parallel; the other end of the capacitor C1 is used as an output end of the voltage reduction circuit; the direct current conversion circuit comprises a diode D2 and a diode D3, wherein the positive electrode of the diode D2 and the negative electrode of the diode D3 are connected with the output end of the voltage reduction circuit, the negative electrode of the diode D2 is connected with the voltage stabilizing circuit, the voltage stabilizing circuit comprises a voltage stabilizing diode D1 and a capacitor C2, the positive electrode of the voltage stabilizing diode D1 is connected with a circuit B, the negative electrode of the voltage stabilizing diode D1 is connected with the negative electrode of the diode D2, and the capacitor C2 is connected with the voltage stabilizing diode D1 in parallel; the positive electrode of the diode D3 is connected with the circuit B, and the negative electrode of the diode D2 is used as the output end of the direct current conversion circuit; the indicating circuit comprises a light emitting diode D4 and a resistor R1, wherein the positive electrode of the light emitting diode D43 is connected with the output end of the direct current conversion circuit, the negative electrode of the light emitting diode D4 is connected with one end of the resistor R1, and the other end of the resistor R1 is used as the output end of the indicating circuit. The key switch K of the input power line disconnection protector is pressed down, the power supply is reduced in voltage through resistors R2 and R3 and a capacitor C1, the power supply is converted into direct-current voltage through diodes D2 and D3, the direct-current voltage is stabilized through a voltage stabilizing diode D1 and a capacitor C2, the direct-current voltage is sent to the control end of the optocoupler Q1 through an indicator light LED and a resistor R1, the optocoupler Q1 is conducted, the input power line disconnection protector is in an electrified state, and the power supply is provided for household appliances at the rear end. When the wires in the two core power wires between the power wire plug and the input power wire broken wire protector are broken, the voltage of the voltage stabilizing diode D1 cannot be maintained, so that the optocoupler Q1 is closed, the input power wire broken wire protector is automatically powered off, and the power supply is not provided for the household appliances at the rear end.
When the invention is put in front of the household appliance, the on-off state of the two-core power line between the power plug and the input power line break protector is monitored, and the invention can also be independently used as an independent product connected with the input end of the household appliance, and can also be integrated with the front end of the household appliance circuit; the power supply can be automatically and timely disconnected when the wires in the two-core power line are disconnected, the household appliances behind the two-core power line are protected, arc faults are timely avoided at the disconnected positions of the two-core power line, accordingly, the household appliances or loads at the rear end are prevented from being damaged, or inflammable objects around the two-core power line are ignited to cause fire, unnecessary property loss or casualties can be avoided, and the use safety of the household appliances is improved.
The foregoing description of the embodiments has been provided for the purpose of illustrating the general principles of the invention, and is not meant to limit the scope of the invention, but to limit the invention to the particular embodiments, and any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (3)
1. The broken line protector of the two-core power line is characterized by comprising the two-core power line, a switch control circuit, a voltage reduction circuit, a direct current conversion circuit, a voltage stabilizing circuit and an indication circuit, wherein two circuits of the two-core power line are used as main circuits, and the main circuits are a circuit A and a circuit B respectively; the switch control circuit is connected with the line A, the line B and the indication circuit; the input end of the switch control circuit is connected with a power supply, the output end of the switch control circuit is connected with one end of a circuit A, and the other end of the circuit A is used as the output end of a protector; the input end of the voltage reduction circuit is connected with the circuit A, the output end of the voltage reduction circuit is connected with the input end of the direct current conversion circuit, and the other input end of the direct current conversion circuit is connected with the circuit B; the voltage stabilizing circuit is connected between the line B and the output end of the direct current conversion circuit; the output end of the direct current conversion circuit is also connected with the input end of the indication circuit, and the output end of the indication circuit is connected with the control end of the switch control circuit;
the switch control circuit comprises a key switch k and an optocoupler Q1, wherein the input end of the optocoupler Q1 is used as a power end of the switch control circuit, the output end of the optocoupler Q1 is an output end of the switch control circuit, one control end of the optocoupler Q1 is connected with the output end of the display circuit, and the other control end of the optocoupler Q1 is connected with a circuit B; the two ends of the key switch k are respectively connected with the input end and the output end of the optical coupler Q1;
the voltage reduction circuit comprises a resistor R2, a capacitor C1 and a resistor R3, wherein one end of the resistor R2 is connected to the line A, the other end of the resistor R2 is connected with one end of the capacitor C1, and the capacitor C1 is connected with the resistor R3 in parallel; the other end of the capacitor C1 is used as an output end of the voltage reduction circuit;
the direct current conversion circuit comprises a diode D2 and a diode D3, wherein the positive electrode of the diode D2 and the negative electrode of the diode D3 are connected with the output end of the voltage reduction circuit, the negative electrode of the diode D2 is connected with the voltage stabilizing circuit, the voltage stabilizing circuit comprises a voltage stabilizing diode D1 and a capacitor C2, the positive electrode of the voltage stabilizing diode D1 is connected with a circuit B, the negative electrode of the voltage stabilizing diode D1 is connected with the negative electrode of the diode D2, and the capacitor C2 is connected with the voltage stabilizing diode D1 in parallel; the positive electrode of the diode D3 is connected with the circuit B, and the negative electrode of the diode D2 is used as the output end of the direct current conversion circuit.
2. The two-core power line disconnection protector according to claim 1, wherein a varistor Rv is further connected in parallel between the power supply terminal of the switch control circuit and the line B.
3. The two-core power line disconnection protector according to claim 1, wherein the indication circuit comprises a light emitting diode D4 and a resistor R1, wherein a positive electrode of the light emitting diode D4 is connected to an output end of the dc conversion circuit, a negative electrode of the light emitting diode D4 is connected to one end of the resistor R1, and the other end of the resistor R1 is used as an output end of the indication circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811031436.1A CN109066615B (en) | 2018-09-05 | 2018-09-05 | Broken wire protector for two-core power line |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811031436.1A CN109066615B (en) | 2018-09-05 | 2018-09-05 | Broken wire protector for two-core power line |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109066615A CN109066615A (en) | 2018-12-21 |
| CN109066615B true CN109066615B (en) | 2024-02-06 |
Family
ID=64758474
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811031436.1A Active CN109066615B (en) | 2018-09-05 | 2018-09-05 | Broken wire protector for two-core power line |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109066615B (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103855681A (en) * | 2012-11-30 | 2014-06-11 | 深圳市海洋王照明工程有限公司 | Lamp open circuit protective circuit |
| CN207625280U (en) * | 2017-12-07 | 2018-07-17 | 广州视源电子科技股份有限公司 | A kind of supply voltage protection circuit and electronic equipment |
| CN208820453U (en) * | 2018-09-05 | 2019-05-03 | 成都彩虹电器（集团）股份有限公司 | A kind of input power cord line disconnection protector |
-
2018
- 2018-09-05 CN CN201811031436.1A patent/CN109066615B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103855681A (en) * | 2012-11-30 | 2014-06-11 | 深圳市海洋王照明工程有限公司 | Lamp open circuit protective circuit |
| CN207625280U (en) * | 2017-12-07 | 2018-07-17 | 广州视源电子科技股份有限公司 | A kind of supply voltage protection circuit and electronic equipment |
| CN208820453U (en) * | 2018-09-05 | 2019-05-03 | 成都彩虹电器（集团）股份有限公司 | A kind of input power cord line disconnection protector |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109066615A (en) | 2018-12-21 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| WO2011068322A3 (en) | Fire-preventing and power-saving intelligent multi-outlet | |
| CN109066615B (en) | Broken wire protector for two-core power line | |
| CN208820453U (en) | A kind of input power cord line disconnection protector | |
| CN104426120A (en) | Overcurrent and overvoltage protection circuit and lamp | |
| CN109245041B (en) | Leakage protection device | |
| CN201118192Y (en) | Controller for limiting power utilization | |
| CN108923382B (en) | Broken wire protector for three-core power line | |
| CN201302931Y (en) | Capacitor with temperature protection function | |
| CN204992522U (en) | Circuit protector | |
| CN204905838U (en) | Simple and easy overvoltage protection trigger device | |
| CN102798789A (en) | Abnormal fault flashing alarm indicating device of grounding system | |
| CN205829133U (en) | Earth leakage protective device voltage protection | |
| CN203747176U (en) | Plug | |
| CN219554088U (en) | Leakage protection socket | |
| CN208596937U (en) | A kind of power supply line protector of charged line breaking protection | |
| CN109787044B (en) | Semi-intelligent tripolar on-off leakage protection plug | |
| CN201918696U (en) | Overload alarm device for power output socket | |
| CN211670630U (en) | Power-on protection circuit and device | |
| CN103795383A (en) | Intelligent switch integrated circuit applied to motorcycle and electrical bicycle | |
| CN202949096U (en) | Power socket with overvoltage protection function | |
| CN104104054B (en) | Relay control type protector off zero | |
| CN219576633U (en) | Cooling reset protection circuit and plug | |
| CN202067366U (en) | Household electrical appliance failure alarm | |
| CN219016473U (en) | Aging indicating circuit and device for reverse-state low-voltage power surge protector | |
| CN208508507U (en) | A kind of arc-extinguishing harmonic-eliminating and over-pressure safety device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |