Switch capable of eliminating surge current

Abstract

The invention relates to the technical field of power distribution cabinets, in particular to a switch capable of eliminating surge current, which comprises a PTC (Positive Temperature Coefficient) thermistor, an NTC (Negative Temperature Coefficient) thermistor, a first plug nut, a second plug nut, a third plug nut, a one-way connecting piece, a two-way connecting piece, a power element and a mounting plate, the two-way connecting piece is provided with a first damper so that the second plug nut can be closed before the first plug nut and the second plug nut can be disconnected before the first plug nut. By arranging the first damper, when the one-way connecting piece and the two-way connecting piece perform closing action, the second inserting nut is closed before the first inserting nut is closed; when the one-way connecting piece and the two-way connecting piece are disconnected, the second plug nut is disconnected before the first plug nut, so that the NTC type thermistor and the PTC type thermistor can reduce the damage of surge formed by sudden change of current to a power supply and a load, reduce accidents such as fire and the like, or reduce the damage to the load.

Description

Technical Field

[0001] The present invention relates to the technical field of power distribution, and in particular to a switch capable of eliminating surge current. Background Art

[0002] In the power grid, many loads are motors. These loads have many coils. When a load with a coil is connected or disconnected in the power grid, the coil will generate high voltage due to the sudden change in current. This high voltage can cause other loads to overload or be damaged, such as fire. Some electric bicycles caught fire while charging, and the surge current generated caused the electric bicycle next to it to catch fire. Therefore, eliminating surge current in the power grid has become an important way to prevent fires. Summary of the invention

[0003] In order to solve the problems in the above background technology, the present invention provides a switch capable of eliminating surge current, which is used in a power distribution cabinet and solves the problem of surge current damaging the load when the circuit is disconnected or connected in the prior art.

[0004] The solution adopted by the present invention to solve the technical problem is: a switch capable of eliminating surge current, comprising a PTC thermistor, an NTC thermistor, a first plug, a second plug, a third plug, a single-way connector for closing the third plug, a double-way connector for closing the first plug and the second plug, a power element for closing the third plug with the single-way connector, and a mounting plate; the PTC thermistor is connected in series with the first plug to form a PTC thermistor assembly; the NTC thermistor is connected in series with the second plug to form an NTC thermistor assembly; the PTC thermistor assembly formed by connecting the PTC thermistor in series with the first plug and the NTC thermistor assembly formed by connecting the NTC thermistor in series with the second plug The NTC thermistor components are connected in parallel, the third plug is connected in parallel with the PTC thermistor component and the NTC thermistor component, the double-way connector is installed on the single-way connector, the double-way connector is rotatably connected to the single-way connector so that the double-way connector can rotate relative to the single-way connector, the double-way connector is provided with a first damper on the side close to the PTC thermistor so that the second plug is closed before the first plug and the second plug is disconnected before the first plug, the single-way connector is connected to the mounting plate through a power element, the double-way connector is provided with a second plug for closing the second plug, a first plug for closing the first plug, and the single-way connector is provided with a third plug for closing the third plug.

[0005] Furthermore, a second damper is included, and the second damper is installed between the mounting plate and the one-way connector so as to make the third female plug contact the third plug slowly.

[0006] In the above structure, the power element is set as a cylinder to prevent the power supply on the first plug nut, the second plug nut, and the third plug nut from being connected to the operator.

[0007] The above structure also includes a second switch, a third female plug, a PTC thermistor assembly, and an NTC thermistor assembly are connected in parallel to form a dual resistor assembly, and the second switch is connected in series with the dual resistor assembly.

[0008] In summary, the beneficial effects of the present invention are as follows: by setting the first damper, when the single-way connector and the double-way connector make a closing action, since the first damper hysteresis the action of the double-way connector on the first plug-in side, the second plug-in is closed before the first plug-in; when the single-way connector and the double-way connector make a disconnecting action, since the first damper hysteresis the disconnecting action of the double-way connector on the first plug-in side, the second plug-in is disconnected before the first plug-in, so that the NTC thermistor can make the resistance of the wire change from high to low after the NTC thermistor is heated when connected, and the current also changes from small to large to prevent the current mutation. At the same time, the PTC thermistor can also make the resistance of the wire change from low to low to high after the PTC thermistor is heated when disconnected, and the current also changes from large to small to prevent the current mutation. In this way, the current of the load changes slowly when it is disconnected or connected, reducing the damage of the surge formed by the current mutation to the power supply and the load, reducing the occurrence of accidents such as fire, or reducing the damage to the load.

[0009] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the following specifically cites a preferred embodiment and describes it in detail with the accompanying drawings as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 A perspective view of the present invention;

[0011] Figure 2 A three-dimensional diagram of the present invention from another angle;

[0012] Figure 3 is a three-dimensional diagram of a two-way connector of the present invention;

[0013] Figure 4 It is a circuit schematic diagram of the present invention.

[0014] In the figure: 1, PTC thermistor; 2, NTC thermistor; 3, first female plug; 4, second female plug; 5, third female plug; 6, single-way connector; 7, double-way connector; 8, power element; 9, mounting plate; 10, first damper; 11, first plug; 12, second plug; 13, third plug; 14, second damper; 15, through hole. DETAILED DESCRIPTION

[0015] In order to make the content of the present invention more clearly understood, the present invention is further described below based on specific embodiments in conjunction with the accompanying drawings.

[0016] It should be noted that the terms "center", "upper", "lower", "front", "back", "left", "right", "inner", "outer" and the like used herein to indicate directions or positional relationships are based on directions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. Unless otherwise specified, "plurality" means two or more.

[0017] Unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0018] Referring to the accompanying drawings, a switch capable of eliminating surge current includes a PTC thermistor 1, an NTC thermistor 2, a first female plug 3, a second female plug 4, a third female plug 5, a single-way connector 6 for closing the third female plug 5, a double-way connector 7 for closing the first female plug 3 and the second female plug 4, a power element 8 for closing the third female plug 5 with the single-way connector 6, and a mounting plate 9. The PTC thermistor 1 is connected in series with the first female plug 3 to form a PTC thermistor assembly, the NTC thermistor 2 is connected in series with the second female plug 4 to form an NTC thermistor assembly, the PTC thermistor 1 is connected in series with the first female plug 3 to form a PTC thermistor assembly, and the NTC thermistor 2 is connected in series with the second female plug 4 to form an NTC thermistor assembly. The two-way connector 7 is connected in parallel with the PTC thermistor assembly and the NTC thermistor assembly, the third plug 5 is connected in parallel with the PTC thermistor assembly and the NTC thermistor assembly, the two-way connector 7 is installed on the single-way connector 6, the two-way connector 7 is rotatably connected to the single-way connector 6 so that the two-way connector 7 can rotate relative to the single-way connector 6, the two-way connector 7 is provided with a first damper 10 on the side close to the PTC thermistor 1 so that the second plug 4 is closed before the first plug 3 and the second plug 4 is disconnected before the first plug 3, the single-way connector 6 is connected to the mounting plate 9 through the power element 8, the two-way connector 7 is provided with a second plug 12 for closing the second plug 4, a first plug 11 for closing the first plug 3, and the single-way connector 6 is provided with a third plug 13 for closing the third plug 5. The first plug 11 inserted into the first plug 3 can make the circuit conductive, the second plug 12 inserted into the second plug 4 can make the circuit conductive, and the third plug 13 inserted into the third plug 5 can make the circuit conductive.

[0019] Furthermore, it also includes a second switch, a third female plug 5, a PTC thermistor assembly, and an NTC thermistor assembly are connected in parallel to form a dual resistor assembly, and the second switch is connected in series with the dual resistor assembly. The second switch can disconnect the circuit when the load is disconnected to ensure that the voltage of the load line is zero.

[0020] Furthermore, a second damper 14 is included, which is installed between the mounting plate 9 and the one-way connector 6 so as to slowly contact the third female connector 5 with the third plug 13. The third female connector 5 slowly contacts the third plug 13, so that the second female connector 4 can be closed for a longer time before the third female connector 5 is closed.

[0021] Furthermore, the power element 8 is configured as a cylinder to prevent conduction between the power supply on the first plug nut 3 , the second plug nut 4 , and the third plug nut 5 and the operator.

[0022] Furthermore, the double-way connector 7 is provided with a through hole 15 so that the power element 8 can be connected to the single-way connector 6 .

[0023] Before the circuit is connected, the first plug 3, the second plug 4, and the third plug 5 are all disconnected. When the circuit is closed, since the first damper 10 hysteresis two-way connector 7 on the side of the first plug 3 closes, the second plug 4 is closed before the first plug 3 and the third plug 5, and the third plug 5 is closed before the first plug 3. When the second plug 4 in the circuit is closed and the circuit is connected, the resistance of the NTC thermistor 2 is relatively large, so when the current passes through, the NTC thermistor 2 will heat up. Since the NTC thermistor 2 will heat up, the resistance of the NTC thermistor 2 will decrease, so the current in the circuit will also gradually increase from small to large, thereby reducing the sudden change of the current from zero to large, and the PTC thermistor 1 does not work. After the third plug 5 is closed, the current will not flow through the two resistors of the PTC thermistor 1 and the NTC thermistor 2.

[0024] Before the circuit is disconnected, the first plug 3, the second plug 4 and / or the third plug 5 are closed. When the circuit is disconnected, the first damper 10 hysteresis two-way connector 7 on the first plug 3 side disconnects, so the second plug 4 is disconnected before the first plug 3 and the third plug 5, and the third plug 5 is disconnected before the first plug 3. The resistance of the PTC thermistor 1 is small, so when the current passes through, the PTC thermistor 1 will also heat up. Since the PTC thermistor 1 will heat up, the resistance of the PTC thermistor 1 will increase, so the current in the circuit will also gradually decrease from large to small, and the NTC thermistor 2 will not work. The first plug 3 can be disconnected after the current is stable or zero, which reduces the sudden change of the current from large to small.

[0025] When the first female plug 3, the second female plug 4, and the third female plug 5 are all closed, the PTC thermistor 1 and the NTC thermistor 2 still have a certain resistance value, so the current flows directly from the third female plug 5, and the PTC thermistor 1 and the NTC thermistor 2 do not work. The third female plug 5 can be connected when the current is in a normal state, reducing the resistance in the circuit and reducing energy consumption. The PTC thermistor is a typical semiconductor resistor with temperature sensitivity. When it exceeds a certain temperature (Curie temperature), its resistance value increases stepwise with the increase of temperature. The resistance value of the NTC thermistor 2 decreases with the increase of temperature.

[0026] The present invention provides a first damper 10. When the single-way connector 6 and the double-way connector 7 make a closing action, the first damper 10 delays the action of the double-way connector 7 on the side of the first plug 3, so the second plug 4 is closed before the first plug 3; when the single-way connector 6 and the double-way connector 7 make a disconnecting action, the first damper 10 delays the disconnecting action of the double-way connector 7 on the side of the first plug 3, so the second plug 4 is disconnected before the first plug 3. In this way, the NTC thermistor can make the resistance of the wire change from high to low after the NTC thermistor is heated when the wire is connected, and the current also changes from small to large to prevent the current from suddenly changing. At the same time, the PTC thermistor can also make the resistance of the wire change from low to low-high after the PTC thermistor is heated when the wire is disconnected, and the current also changes from large to small to prevent the current from suddenly changing. In this way, the current of the load changes slowly when it is disconnected or connected, reducing the damage of the surge formed by the sudden current to the power supply and the load, reducing the occurrence of accidents such as fire, or reducing the damage to the load. Specifically, it has the following beneficial effects:

[0027] 1. The present invention provides a first damper 10. When the single-way connector 6 and the double-way connector 7 make a closing action, the first damper 10 delays the action of the double-way connector 7 on the first plug 3 side, so the second plug 4 is closed before the first plug 3; when the single-way connector 6 and the double-way connector 7 make a disconnecting action, the first damper 10 delays the disconnecting action of the double-way connector 7 on the first plug 3 side, so the second plug 4 is disconnected before the first plug 3;

[0028] 2. The present invention eliminates the surge current when the circuit is disconnected by using the PTC thermistor 1, that is, reducing the sudden change of the current from large to small; and eliminates the surge current when the circuit is connected by using the NTC thermistor 2, that is, reducing the sudden change of the current from small to large, so that the circuit surge current can be eliminated;

[0029] 3. The present invention is provided with a second damper 14, which is installed between the mounting plate 9 and the one-way connector 6 so as to make the third female plug 5 slowly contact the third plug blade 13. The third female plug 5 slowly contacts the third plug blade 13, so that the second female plug 4 can be closed longer before the third female plug 5 is closed, and the PTC thermistor 1 and the NTC thermistor 2 can eliminate the surge current for more time;

[0030] 4. The present invention sets the power element 8 as a cylinder to prevent the power supply on the first plug nut 3, the second plug nut 4, and the third plug nut 5 from being connected to the operator, thereby avoiding accidents caused by leakage.

[0031] The embodiments described above are only preferred implementation modes of the present invention and cannot be used to limit the protection scope of the present invention. Any non-substantial changes and modifications made by those skilled in the art on the basis of the invention shall fall within the protection scope of the present invention.

Claims

1. A switch capable of eliminating surge current, characterized in that: The invention comprises a PTC thermistor, an NTC thermistor, a first plug, a second plug, a third plug, a single-way connector for closing the third plug, a double-way connector for closing the first plug and the second plug, a power element for closing the third plug with the single-way connector, and a mounting plate. The PTC thermistor is connected in series with the first plug to form a PTC thermistor assembly. The NTC thermistor is connected in series with the second plug to form an NTC thermistor assembly. The PTC thermistor is connected in series with the first plug to form a PTC thermistor assembly. The NTC thermistor assembly formed by connecting the PTC thermistor in series with the first plug and the NTC thermistor assembly formed by connecting the NTC thermistor in series with the second plug are connected in parallel. The third plug is connected to the PTC thermistor assembly. The thermistor assembly and the NTC thermistor assembly are connected in parallel, the two-way connector is installed on the single-way connector, the two-way connector is rotatably connected to the single-way connector so that the two-way connector can rotate relative to the single-way connector, the two-way connector is provided with a first damper on a side close to the PTC thermistor so that the second plug is closed before the first plug and the second plug is disconnected before the first plug, the single-way connector is connected to the mounting plate through the power element, the two-way connector is provided with a second plug for closing the second plug, a first plug for closing the first plug, and the single-way connector is provided with a third plug for closing the third plug.

2. The switch according to claim 1, characterized in that: A second damper is also included, which is installed between the mounting plate and the one-way connector so as to slowly bring the third female plug into contact with the third plug piece.

3. The switch according to claim 1, characterized in that: It also includes a second switch, the third female plug, the PTC thermistor component, and the NTC thermistor component are connected in parallel to form a dual resistor component, and the second switch is connected in series with the dual resistor component.

4. The switch according to claim 1, characterized in that: The power element is configured as a cylinder to prevent conduction between the power supply on the first nut, the second nut, and the third nut and the operator.

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