WO2011150684A1

WO2011150684A1 - Direct current arc proof circuit and method thereof

Info

Publication number: WO2011150684A1
Application number: PCT/CN2011/000931
Authority: WO
Inventors: 戴国峰
Original assignee: 江苏艾索新能源股份有限公司
Priority date: 2010-06-02
Filing date: 2011-06-02
Publication date: 2011-12-08
Also published as: CN101888045A

Abstract

A direct current arc proof circuit and a method for preventing direct current arc in the inserting and pulling course of a connector The direct current arc proof circuit comprises a connector contact (1), a main contact (2) and an assistant contact (3). An electronic switch which controls the circuit connection to open and close is provided in the connection circuit between the main contact and the assistant contact. The assistant contact is located at the position which the connector contact will reach before it reaches the main contact. The direct current arc proof circuit has a simple structure, is convenient to use and has a low cost.

Description

Circuit and method for preventing DC arc pull

The present invention relates to a circuit and method for preventing DC arcing. Background technique

When the two contacts of the connector are electrically separated, as long as the voltage in the circuit is greater than 10~20V. The current is greater than 80~100mA. Arcing may occur between moving and stationary contacts. At this point the contacts are separated, but the current continues to circulate through the arc between the contacts.

The instantaneous value of the current of the alternating current changes periodically with time, so at the zero-crossing point of the current, the current becomes 0, and the arc automatically disappears. However, since the DC current has no current crossing point, it is difficult to extinguish the arc after the arc is generated; the arc will disappear automatically until the two contacts of the connector are separated by a sufficient distance.

The arc is a free gas with high temperature and high conductivity. It not only has a great destructive effect on the contacts, but also may cause serious damage to the surrounding people or equipment, and even cause serious disasters such as fire.

In most practical applications of solar grid-connected inverters, the DC input voltage is generally between 100 and 1000V, and the current and voltage are much larger than the arc generation conditions. During the installation, operation and maintenance of the grid-connected inverter, the load may need to be cut off. Therefore, a DC switch with on-load switching capability must be added to the DC input side of the grid-connected inverter.

Due to the special nature of DC arc extinguishing, the DC switch on the market is very expensive. A 20A/1000VDC DC switch is about 1000 yuan. Summary of the invention

The object of the present invention is to provide a circuit for preventing DC arcing, which is simple in structure, convenient to use, has few circuit links, and has low cost. Another object of the present invention is to provide a method for preventing DC arcing during plugging and unplugging of a connector, which is simple in method, convenient to use, has few circuit links, and has low cost.

The technical solution of the circuit of the present invention is: a circuit for preventing DC arcing, which comprises a connector contact, a main contact, an auxiliary contact, and a connection circuit between the main contact and the auxiliary contact is provided An electronic switch that controls the connection circuit to open or close.

The auxiliary contact is disposed at a position that the connector contact must be in contact with before contacting the main contact.

The conventional connector is in the form of two contacts, and the technical solution achieves arc elimination by adding an auxiliary contact and an electronic switch. The key is: In the process of plugging the contacts, when the contacts of the connector are connected with the auxiliary contacts, the current flow of the connector turns to the auxiliary current path of the electronic switch, and the circuit realizes arc extinguishing through the loop; In the process of the contact, when the contact of the connector is separated from the main contact, the current flow of the connector is turned to the auxiliary current path of the electronic switch, and the circuit also performs arc suppression through the circuit; when the contact of the connector is When the auxiliary contacts are separated, the electronic switch is turned off and no current is present, so no arc is generated.

The technical solution of the method of the present invention is: a method for preventing DC arcing during plugging and unplugging of a connector, the method comprising: electrically connecting an auxiliary contact to a connector main contact through a connecting circuit provided with an electronic switch;

The following steps are included in the process of plugging the connector,

a. The electronic switch remains disconnected at the beginning of the process of plugging in the connector.

b. When the head end of the connector contact is connected to the connector auxiliary contact, the electronic switch is closed, and the current flowing through the connector passes through the connection circuit where the electronic switch is located to thereby prevent the arcing problem during access.

c When the head end of the connector contact is connected to the main contact of the connector, the electronic switch can be closed or disconnected at this time;

The following steps are included in the process of unplugging the connector.

d. The head end of the connector contact is separated from the connector main contact, during which the electronic switch remains Closed, the current flowing through the connector passes through the connection circuit where the electronic switch is located, thereby preventing the arcing problem when the switch is turned off.

e. When the head end of the connector contact is about to be separated from the connector auxiliary contact, the electronic switch is disconnected, the current flowing through the connector is also disconnected synchronously, and the head end of the connector contact is disconnected from the connector auxiliary contact. Open, and thus achieve the problem of preventing arcing when turning off,

f. The head end of the connector contact is completely separated from the connector auxiliary contact, reaching the initial position, forming a certain physical isolation from the connector auxiliary contact, and the electronic switch remains closed or disconnected.

The invention has the advantages that: the invention has simple implementation method, few circuit steps and low cost. DRAWINGS

The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

Figure 1 is a schematic view of the application of the present invention (the structure of the present invention is shown in a virtual frame);

2, FIG. 3, FIG. 4, FIG. 5, FIG. 6, and FIG. 7 are schematic diagrams showing steps in the process of plugging and unplugging the connector of the method of the present invention.

Where: 1 contact; 2 main contact; 3 auxiliary contact; 5 electronic switch; 6 load.

detailed description

Embodiment 1 - As shown in FIG. 1, a circuit for preventing DC arcing, comprising a connector contact 1, a main contact 2, an auxiliary contact 3, between the main contact 2 and the auxiliary contact 3 The connection circuit is provided with an electronic switch 5 that can control the connection circuit to open or close.

The auxiliary contact 3 is disposed at a position that the connector contact 1 must contact before it contacts the main contact 2. 931 The conventional connector is in the form of two contacts, and the present invention achieves arc elimination by adding an auxiliary contact and an electronic switch. The key is: During the process of inserting the contacts, when the contact 1 of the connector is connected with the auxiliary contact 3, the current flow of the connector is turned to the auxiliary current path of the electronic switch 5, and the circuit realizes the arc suppression through the circuit. During the process of pulling out the contacts, when the contact 1 of the connector is separated from the main contact 2, the current flow of the connector is turned to the auxiliary current path of the electronic switch 5, and the circuit also performs arc suppression through the circuit; When the contact 1 of the connector is separated from the auxiliary contact 3, the electronic switch 5 has been disconnected, and no current is present, so that no arc is generated.

Embodiment 2:

As shown in FIG. 1, a method for preventing DC arcing during plugging and unplugging of a connector, the method comprising electrically connecting an auxiliary contact 3 to a connector main contact 2 through a connecting circuit provided with an electronic switch 5; The auxiliary contact 3 is disposed at a position that the connector contact 1 must come into contact with before the main contact 2.

In the process of inserting the connector, the following steps are included, as shown in Fig. 2, Fig. 3, and Fig. 4, the dotted arrow in the figure indicates the current flow direction, and the solid arrow indicates the moving direction of the contact:

a. As shown in Figure 2, the electronic switch 5 remains open at the beginning of the process of plugging the connector. b. As shown in FIG. 3, when the head end of the connector contact 1 is connected to the connector auxiliary contact 3, the electronic switch 5 is closed, and the current flowing through the connector is prevented by the connection circuit in which the electronic switch 5 is located. Pulling arc problem when accessing.

c As shown in Figure 4, when the head end of the connector contact 1 is connected to the connector main contact 2, the electronic switch 5 remains closed or disconnected at this time.

The following steps are included in the process of unplugging the connector. As shown in Figure 5, Figure 6, and Figure 7, the dotted arrows in the illustration indicate the current flow:

d. As shown in Figure 5, the head end of the connector contact 1 is separated from the connector main contact 2, The electronic switch 5 in the process remains closed, and the current flowing through the connector passes through the connection circuit where the electronic switch 5 is located to further prevent the arcing problem when the switch is turned off.

e. As shown in Fig. 6, when the head end of the connector contact 1 is about to be separated from the connector auxiliary contact 3, the electronic switch 5 is disconnected, and the current flowing through the connector is also synchronously disconnected, the connector contact 1 The head end and the connector auxiliary contact 3 are again disconnected, thereby achieving the problem of preventing arcing when the switch is turned off.

f. As shown in Figure 7, the head end of the connector contact 1 is completely separated from the connector auxiliary contact 3, reaching the initial position, forming a certain physical isolation from the connector auxiliary contact 3, at which time the electronic switch 5 remains closed. Or disconnected.

It should be noted that various modifications and adaptations of the present invention are possible without departing from the specific embodiments of the embodiments described above. The above embodiments are merely illustrative and not limiting. In conclusion, the scope of the invention should be construed to include any alterations or substitutions and modifications which are obvious to those skilled in the art.

Claims

Claim

A circuit for preventing DC arcing, characterized in that it comprises a connector contact (1), a main contact (2), an auxiliary contact (3), the main contact (2) and an auxiliary contact An electronic switch (5) is provided on the connection circuit between the points (3) to control the connection circuit to be opened or closed.

2. The circuit for preventing DC arcing according to claim 1, wherein: the auxiliary contact (3) is disposed in contact with the connector contact (1) before contacting the main contact (2). The location.

3. A method for preventing DC arcing during plugging and unplugging of a connector, characterized in that the method comprises: connecting an auxiliary contact (3) through a connecting circuit provided with an electronic switch (5) and a connector main contact

(2) Electrical connection;

The following steps are included in the process of plugging the connector,

a. The electronic switch (5) remains disconnected at the beginning of the process of plugging the connector.

b. When the head end of the connector contact (1) is connected to the connector auxiliary contact (3), the electronic switch (5) is closed, and the current flowing through the connector passes through the connection circuit where the electronic switch (5) is located. To achieve the problem of arcing when preventing access,

c. When the head end of the connector contact (1) is connected to the connector main contact (2), the electronic switch (5) remains closed or disconnected;

The following steps are included in the process of unplugging the connector.

d. The head end of the connector contact (1) is separated from the connector main contact (2). During this process, the electronic switch (5) remains closed, and the current flowing through the connector passes through the electronic switch (5). Connecting the circuit to prevent the arcing problem when the circuit is turned off,

e. When the head end of the connector contact (1) and the connector auxiliary contact (3) are about to be separated, the electronic switch (5) remains disconnected, and the current flowing through the connector is also disconnected synchronously. The connector contact 1 The head end is disconnected from the connector auxiliary contact 3, thereby preventing the arcing problem when the switch is turned off.

f. The head end of the connector contact (1) is completely separated from the connector auxiliary contact (3), reaching the beginning The starting position forms a certain physical isolation from the connector auxiliary contact (3), and the electronic switch (5) remains closed or disconnected.

4. The method for preventing DC arcing during plugging and unplugging of a connector according to claim 3, wherein: the auxiliary contact (3) is disposed at a connector contact (1) and a main contact (2) In the position that must be touched before contact.