CN112769004A

CN112769004A - Method for eliminating direct current system socket arc and device and application thereof

Info

Publication number: CN112769004A
Application number: CN201911062416.5A
Authority: CN
Inventors: 白建成; 周新宇; 刘诗靖
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-11-02
Filing date: 2019-11-02
Publication date: 2021-05-07

Abstract

The invention discloses a device and a method for eliminating direct current socket contact arcs, which comprise a main contact M +, an M-and an auxiliary contact S, a semiconductor element triggering and overcurrent protection circuit (OCP), a contact M + and load plug connection state detection circuit (SMC), an arc extinction unit energy-taking circuit (GPC) and a load current transfer absorption circuit (TCR) consisting of a semiconductor element T, a capacitor C, a resistor R and a transient suppression diode TVS. The contact M + is connected with the input pole of the T and the positive pole of the power supply, the contact S is connected with the output pole of the T, the R and the C are connected in series and then connected in parallel at two ends of the T, the TVS is also connected in parallel at two ends of the T, and the contact M-is connected with the negative pole of the power supply. The invention realizes no electric arc when the load plug is disconnected with the socket by dividing the contact of the traditional socket into the main contact M + and the auxiliary contact S and adding the load current transfer absorption circuit between the contact M + and the contact S. The device and the method thereof are suitable for high-voltage or low-voltage direct current sockets, and are simple, reliable and practical.

Description

Method for eliminating direct current system socket arc and device and application thereof

Technical Field

The invention belongs to the technical field of arc-free breaking in a direct current circuit, and particularly relates to a method for eliminating an arc between a plug and a socket in a direct current socket plugging process, and a device and application thereof.

Background

The existing direct current plug can generate certain electric arc in the process of separating from the direct current socket, thereby not only influencing the service life of the plug and the socket, but also hindering the safety, particularly under the condition of higher direct current voltage or larger current, the problem of the electric arc is more prominent, and the arc extinguishing measure is very necessary. The arc extinguishing method of the hybrid direct current breaker which is widely used at present is complex, has large control difficulty, and has high cost, large volume and larger application difficulty when being applied to a direct current socket. The new device for realizing arc extinction by utilizing the auxiliary moving contact leads to complex structure and low reliability due to the need of using a mechanical device, and is not beneficial to miniaturization and practicability. The other type of arc extinguishing mode through a physical or chemical method is to perform arc extinguishing after an arc occurs, and has the advantages of complex structure, high cost and short service life due to easy burning of contacts.

Disclosure of Invention

The invention aims to provide a method for eliminating the separated electric arc of a direct current plug and a socket, a device and application thereof, which have the advantages of simple principle, science, effectiveness, safety and reliability.

In order to solve the technical problems, the invention adopts the following technical scheme: the device for eliminating the contact arc of the direct current socket comprises a main contact M +, M-, an auxiliary contact S, a semiconductor element triggering and overcurrent protection circuit (OCP), a main contact M + and load plug connection state detection circuit (SMC), an arc extinction unit energy-taking circuit (GPC) and a load current transfer absorption circuit (TCR) consisting of a semiconductor element T, a capacitor C, a resistor R and a transient suppression diode TVS. The fixed contact M + is connected with the input pole of the semiconductor element T and the positive pole of a power supply, the auxiliary contact S is connected with the output stage of the semiconductor element T, the resistor R and the capacitor C are connected in series and then connected in parallel at two ends of the input pole and the output pole of the semiconductor element T, the transient suppression diode TVS is connected in parallel at two ends of the input pole and the output pole of the semiconductor element T, and the main contact M-is connected with the negative pole of the power supply.

The semiconductor element T may be a transistor, a metal-oxide semiconductor field effect transistor (MOSFET), or an Insulated Gate Bipolar Transistor (IGBT). The semiconductor element T may be used with a plurality of devices in parallel or in series depending on power and withstand voltage.

The device for eliminating the arc of the direct current socket contact can be applied to a high-voltage or low-voltage direct current socket.

With the device for eliminating the electric arc of the direct current socket contact, the main contact M + and the auxiliary contact S are positioned on the same vertical interface, can be reliably contacted with the plug and have a certain space distance.

The main contact M +, the main contact M-and the auxiliary contact S of the device for eliminating the electric arc of the direct current socket contact are fixed contacts (static contacts) and do not move along with the plugging and unplugging process of the plug.

By using the device for eliminating the electric arc of the direct current socket contact, the auxiliary contact S and the main contact M + can be positioned on the same vertical interface to cut off the electric arc in cooperation with the main contact M +, and can also be positioned on the same vertical interface to cut off the electric arc in cooperation with the main contact M-, and the arc extinguishing principles of the two modes are similar. For different connection modes, the semiconductor element T can be selected to be different in model, and the on-off control of the semiconductor element T is facilitated.

The working power supply of the device for eliminating the direct current socket contact arc is directly obtained from a direct current power supply system in the device through an arc extinction unit energy-obtaining circuit (GPC) without being connected with an external independent power supply.

When the method for eliminating the electric arc of the direct current socket contact is used, the breaking process comprises four processes: firstly, when a Load plug is inserted into a socket, a main contact M + and a Load plug connection state detection circuit (SMC) detects that the main contact M + is communicated with the Load plug, and simultaneously controls a semiconductor element T to be conducted, and at the moment, a Load (Load) is supplied with power by the main contact M + and the Load plug; in the process of pulling out the Load plug, the Load plug is firstly separated from the main contact M +, at the moment, the Load current is switched to a loop consisting of the semiconductor element T and the auxiliary contact S from the main contact M +, and the Load (Load) is supplied with power by the auxiliary contact S and the main contact M-; when the load plug is disconnected with the main contact M +, the state detection circuit detects that the main contact M + is disconnected with the load plug, the semiconductor element T is controlled to be turned off at the moment, the load current is switched to a loop formed by the resistor R and the capacitor C by the semiconductor element T, the capacitor C is charged by the load current, the voltage of the capacitor C is increased in the charging process, and the load current is reduced; when the load current is reduced to zero, the load power supply is cut off, and the arc extinction function is realized. The transient suppression diode TVS can prevent the capacitor C from damaging the semiconductor device T due to the excessively high charging voltage.

By using the method for eliminating the electric arc of the direct current socket contact, the connection state of the main contact M + and the auxiliary contact S can be realized through a mechanical structure, and the specific method comprises the following steps: by adding the position switch SP at the main contact M +, the position switch SP is closed when the load plug is in contact with the main contact M +, and the position switch SP is open when the load plug is disengaged from the main contact M +. The method can also be realized in a circuit detection mode, and the specific method comprises the following steps: by adding the excitation source VS between the main contact M + and the auxiliary contact S, the voltage between the main contact M + and the auxiliary contact S is 0 volt when the load plug is in contact with the main contact M +, and the voltage between the main contact M + and the auxiliary contact S is more than 0 volt when the load plug is separated from the main contact M +.

The method for eliminating the electric arc of the direct current socket contact is applied to the high-voltage or low-voltage direct current socket.

Aiming at solving the problem that the direct current socket contact arc lacks effective measures at present, the inventor designs and manufactures a device for eliminating the direct current socket contact arc, which comprises a main contact M +, M-, an auxiliary contact S, a semiconductor element triggering and overcurrent protection circuit (OCP), a main contact M + and load socket connection state detection circuit (SMC), an arc extinction unit energy-taking circuit (GPC) and a load current transfer absorption circuit (TCR) consisting of a semiconductor element T, a capacitor C, a resistor R and a transient suppression diode TVS. The fixed contact M + is connected with the input pole of the semiconductor element T and the positive pole of a power supply, the auxiliary contact S is connected with the output stage of the semiconductor element T, the resistor R and the capacitor C are connected in series and then connected in parallel at two ends of the input pole and the output pole of the semiconductor element T, the transient suppression diode TVS is connected in parallel at two ends of the input pole and the output pole of the semiconductor element T, and the main contact M-is connected with the negative pole of the power supply.

The invention realizes that no arc is generated when the load plug is disconnected with the socket by dividing the contact of the traditional socket into the main contact M + and the auxiliary contact S and adding the load current transfer absorption circuit (TCR) between the main contact M + and the auxiliary contact S. The device and the method thereof are suitable for high-voltage or low-voltage direct current sockets, and have the advantages of simplicity, reliability and strong practicability. Firstly, when the socket is normally used, different power grades and different types of semiconductor elements can be selected according to the power grades of the socket, and meanwhile, as the breaking process is very quick, the duration of current flowing through the semiconductor elements is very short, the elements cannot be damaged due to overheating; secondly, due to the adoption of the fixed contact, the use of a mechanical structure is reduced, and the reliability and the durability of the device are improved; thirdly, the connection state of the plug and the socket is detected through a state detection circuit (SMC), the load current is automatically controlled to be transferred to a load current transfer absorption circuit (TCR), and the arc extinction when the plug and the socket are separated is realized through controlling the reliable turn-off of a semiconductor element T. Fourthly, the charging and discharging time of a capacitor C in a load current transfer absorption circuit (TCR) is short, the response speed is far greater than the action time of inserting and pulling out a load plug, the arc extinction function still cannot be failed under the condition of repeated plugging and pulling out or reinsertion of the plug without completely pulling out, and the reliability and the usability of the direct current plug in use are greatly improved.

Drawings

Fig. 1 is a schematic diagram of an apparatus for eliminating arcing of contacts of a dc system socket.

Fig. 2 is a schematic view of the plug in contact with both the main contact M + and the auxiliary contact S, wherein: a structure and state diagram and b circuit schematic diagram.

Fig. 3 is a schematic diagram of the case where the plug is disconnected from the main contact M + and is brought into contact with the auxiliary contact S, and the semiconductor element T is turned on, in which: a structure and state diagram and b circuit schematic diagram.

Fig. 4 is a schematic view of the plug in contact with the auxiliary contact S in the open state of the main contact M + and the semiconductor element T in the closed state, in which: a structure and state diagram and b circuit schematic diagram.

Fig. 5 is a schematic view of the plug when fully withdrawn, in which: a structure and state diagram and b circuit schematic diagram.

FIG. 6 shows the load voltage V during unplugging of the load plug_LAnd a load current I_LOver timeSchematic representation of the variation;

fig. 7 is a schematic view of an embodiment in which the auxiliary contact S is at the same vertical interface with the main contact M-.

Fig. 8 is a schematic diagram of one implementation of a main contact M + and load plug connectivity status detection circuit (SMC). In the figure: a mechanical detection mode and b external excitation source detection mode.

Fig. 9 is a schematic diagram of an embodiment in which a plurality of semiconductor elements T are connected in series.

Fig. 10 is a schematic diagram of another embodiment, in which a plurality of semiconductor elements T are connected in parallel.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are a part of the present invention, and not all of it. 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.

In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present invention by illustrating examples of the present invention. In the drawings and the following description, at least some well-known structures and techniques have not been shown in detail in order to avoid unnecessarily obscuring the present invention; also, the dimensions of some of the structures may be exaggerated for clarity. Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

The directional terms appearing in the following description are intended to be illustrative in all directions, and are not intended to limit the specific construction of embodiments of the present invention. In the description of the present invention, it should be further noted that the terms "section," "control," and "functional module" are to be construed broadly unless otherwise explicitly specified or limited. The specific meaning of the above terms in the present invention can be understood as appropriate to those of ordinary skill in the art.

As shown in fig. 1, the device for eliminating the arc of the direct current system socket of the present invention includes a main contact M +, M-, and an auxiliary contact S, a semiconductor element triggering and overcurrent protection circuit (OCP), a main contact M + and load plug connection state detection circuit (SMC), an arc extinguishing unit energy extraction circuit (GPC), and a load current transfer absorption circuit (TCR) composed of a semiconductor element T, a capacitor C, a resistor R, and a transient suppression diode TVS.

With the method for eliminating the arc of the direct current socket contact, the load plug and the socket are disconnected in four stages, as shown in fig. 2 to 5.

In a first phase, as shown in FIG. 2, when the Load plug is inserted into the receptacle, the Load (Load) is powered by the main contacts M + and M-. Meanwhile, a main contact M + and load plug connection state detection circuit (SMC) detects the main contact M + and the load plug, thereby controlling the semiconductor element T to be in a conduction state;

in the second stage, as shown in fig. 3, during the process of pulling out the Load plug, the plug and the main contact M + are separated from contact, at this time, the Load current is switched from the main contact M + to a loop formed by the semiconductor element T and the auxiliary contact S, and the Load (Load) is supplied with power by the auxiliary contact S and the main contact M-; because the semiconductor element T is in a conducting state, no electric arc is generated in the process that the load current is switched from the main contact M + to a loop formed by the semiconductor element T and the auxiliary contact S;

in the third stage, as shown in fig. 4, after the load plug is disconnected from the main contact M +, the state detection circuit detects that the load plug is disconnected from the main contact M +, thereby controlling the semiconductor element T to be turned off, the load current is switched to a loop formed by a resistor R and a capacitor C by the semiconductor element T, the load current charges the capacitor C, the voltage of the capacitor C increases in the charging process, and the load current rapidly decreases until the load current decreases to zero; the transient suppression diode TVS can prevent the capacitor C from damaging the semiconductor element T due to overhigh charging voltage;

in the fourth stage, as shown in fig. 5, as the load plug is pulled out continuously, when the plug is separated from the main contact M-and the auxiliary contact S, the load current is reduced to zero, the load power supply is cut off, and therefore, the arc cannot be generated, thereby realizing the arc extinction function of the whole breaking process.

FIG. 6 shows the load voltage V during unplugging of the load plug_LAnd a load current I_LA schematic of the change over time; wherein t0 to t1 are the first stage, where the load plug starts to open, but has not yet separated from the main contact M +; t1 to T2 are the second stage, in which the load plug is separated from the main contact M +, but the semiconductor element T has not yet started to turn off; T2-T3 is the third stage, in which the semiconductor device T is turned off and the load current is switched to the loop formed by the resistor R and the capacitor C, and the load voltage V is set_LAnd a load current I_LRapidly decrease until it reaches zero; at time t3, the load plug and each contact of the socket are completely separated, and the arc-free breaking process is completed.

In an alternative embodiment, as shown in fig. 7, the semiconductor device triggering and overcurrent protection circuit (OCP), the main contact M + connection state detection circuit (SMC), the arc extinguishing unit energy extraction circuit (GPC), the load current transfer absorption circuit (TCR) and the auxiliary contact S according to the present invention are moved to the negative side of the dc power supply, and the main contact M-is matched to perform the function of arc extinguishing and breaking. The principle of arc extinction of this connection is similar to that of the mating main contact M +. For different connection modes, the semiconductor element T can be selected from different models, so that the on-off control of the semiconductor element T is facilitated.

It is understood that the following circuit module semiconductor element triggering and overcurrent protection circuit (OCP), main contact M + and load plug connection state detection circuit (SMC), and arc suppression unit power extraction circuit (GPC) described in the present invention may have various implementations. For example, an alternative embodiment is shown in fig. 8(a), by adding a position switch SP at the main contact M +, which is closed when the load plug is in contact with the main contact M +, and opened when the load plug is disengaged from the main contact M +. In another alternative embodiment, the main contact M + and the load plug connection state detection circuit (SMC) are implemented by the method shown in fig. 8 (b): an excitation source, a diode D, a resistor R1 and a resistor R2 are added between the main contact M + and the auxiliary contact S. And the connection state of the main contact M + and the load plug is judged by collecting the voltage at the two ends of the resistor R2. When the load plug is in contact with the main contact M +, the voltage across the resistor R2 is 0V; when the load plug is disconnected from the main contact M +, the voltage across the resistor R2 is greater than 0 volts.

An alternative embodiment, as shown in fig. 9 and 10, is to connect a plurality of semiconductor devices T in series or in parallel to meet different application requirements.

In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the circuit blocks is only one logical division, and there may be other divisions in actual implementation, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not executed.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. The device for eliminating the contact arc of the direct current socket comprises a main contact M + and an M-and is characterized by further comprising an auxiliary contact S, a semiconductor element triggering and overcurrent protection circuit (OCP), a main contact M + and load plug connection state detection circuit (SMC), an arc extinction unit energy-taking circuit (GPC) and a load current transfer absorption circuit (TCR) consisting of a semiconductor element T, a capacitor C, a resistor R and a transient suppression diode TVS.

2. The apparatus for extinguishing arcing in a dc outlet contact of claim 1, wherein: the working power supply is directly obtained from a direct current power supply system in the device through an arc extinction unit energy-taking circuit (GPC) without being connected with an external independent power supply.

3. The apparatus for extinguishing arcing in a dc outlet contact of claim 1, wherein: the auxiliary contact S can be positioned at the same vertical interface with the main contact M + to cut off the electric arc in cooperation with the main contact M +, and can also be positioned at the same vertical interface with the main contact M-to cut off the electric arc in cooperation with the main contact M-, and the arc extinguishing principles of the two modes are similar.

4. The apparatus for extinguishing arcing in a dc outlet contact of claim 3, wherein: for different connection modes, the semiconductor element T can be selected to be different in model, and the on-off control of the semiconductor element T is facilitated.

5. A method of eliminating arcing in a dc outlet contact using the apparatus of claim 1, comprising: the breaking process comprises four processes: firstly, when a Load plug is inserted into a socket, a main contact M + and a Load plug connection state detection circuit (SMC) detects that the main contact M + is communicated with the Load plug, and simultaneously controls a semiconductor element T to be conducted, and at the moment, a Load (Load) is supplied with power by the main contact M + and the Load plug; in the process of pulling out the Load plug, the plug is separated from the main contact M +, at the moment, the Load current is switched to a loop consisting of the semiconductor element T and the auxiliary contact S from the main contact M +, and the Load (Load) is supplied with power by the auxiliary contact S and the main contact M-; when the load plug is disconnected with the main contact M +, the state detection circuit detects that the main contact M + is disconnected with the load socket, the semiconductor element T is controlled to be turned off at the moment, the load current is switched to a loop formed by the resistor R and the capacitor C by the semiconductor element T, the capacitor C is charged by the load current, the voltage of the capacitor C is increased in the charging process, and the load current is reduced; when the load current is reduced to zero, the load power supply is cut off, and the arc extinction function is realized.

6. A method of eliminating arcing in a dc outlet contact using the apparatus of claim 5, wherein: the transient suppression diode TVS prevents the capacitor C from damaging the semiconductor device T due to an excessively high charging voltage.

7. A method of eliminating arcing in a dc outlet contact using the apparatus of claim 5, wherein: the connection state of the main contact M + and the load plug can be realized through a mechanical structure, and the specific method comprises the following steps: by adding a position switch SP at the main contact M +, the position switch SP is closed when the load plug is in contact with the main contact M +, and the position switch SP is opened when the load plug is separated from the main contact M +; the method can also be realized in a circuit detection mode, and the specific method comprises the following steps: by adding the excitation source VS between the main contact M + and the auxiliary contact S, the voltage between the main contact M + and the auxiliary contact S is 0 volt when the load plug is in contact with the main contact M +, and the voltage between the main contact M + and the auxiliary contact S is more than 0 volt when the load plug is separated from the main contact M +.