KR20170009119A

KR20170009119A - Magnetic switch

Info

Publication number: KR20170009119A
Application number: KR1020150100618A
Authority: KR
Inventors: 안태운
Original assignee: 엘에스산전 주식회사
Priority date: 2015-07-15
Filing date: 2015-07-15
Publication date: 2017-01-25

Abstract

The present invention relates to an electronic apparatus comprising a pair of first and second fixed contacts connected to an external device and a second fixed contact disposed at a lower end of the first and second fixed contacts and being in contact with or separated from the first and second fixed contacts, Wherein the first current direction at the first stationary contact and the third current direction at the movable contact contacting the first stationary contact are the same, The second current direction and the fourth current direction at the movable contact contacting the second stationary contact provide the same electromagnetic switching device.

Description

MAGNETIC SWITCH [0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic switching device, and more particularly, to an electromagnetic switching device capable of reducing an electromagnetic repulsive force using a suction force.

High voltage DC relays are applied to electric vehicle (EV), HEV, PHEV and so on.

The relay applies the energy of the battery to the inverter in the electric vehicle, and serves as an interruption and protection against the fault current.

At present, the lithium-ion battery is applied to the battery, and when a short-circuit occurs, a current of several thousand kA is applied. At this time, the relay shall withstand the damage and fire of the product until the fuse is shut off. At this time, the contact point of the relay must be able to withstand the electromagnetic repulsion force (EMR) generated by the single-wire current.

However, in the case of the electromagnetic opening / closing apparatus according to the related art, the fixed contact and the movable contact are attached to each other at the time of on, and the electric current flows in opposite directions.

When an instantaneous high current (that is, a short circuit current) flows through the stationary contact and the movable contact, a phenomenon occurs in which the stationary contact and the movable contact push each other due to the electromagnetic repulsive force generated between the stationary contact and the movable contact. At this time, when the force of the contact pressure spring at the lower part of the movable contact is insufficient, the stationary contact and the movable contact momentarily fall off.

As described above, when the fixed contact and the movable contact momentarily fall off during current application, an arc is generated between the contact points, and contact damage or welding occurs between the contacts.

In addition, when an instantaneous short circuit current occurs due to an accident, since the electromagnetic repulsion force (EMR) must be sustained only depending on the force of the contact spring, the force of the contact spring becomes large, (Pick-up voltage), i.e., power consumption, is increased.

An object of the present invention is to provide an electronic switching device capable of reducing the electromagnetic repulsion force under an instantaneous short circuit current, thereby increasing the protection performance of the electronic switching device.

In order to achieve the above object, an electromagnetic opening / closing apparatus according to the present invention comprises: a pair of first and second fixed contacts connected to an external device; a second fixed contact disposed at a lower end of the first and second fixed contacts, A movable contact that contacts or is separated from the contact and supplies or cuts off power to the external device; a shaft which drives the movable contact through up-and-down movement and is located around a portion of the movable contact; And a fixed core including a fixed core having a through-hole formed therein so that the shaft moves vertically, wherein a first current direction in the first fixed contact and a third current in a movable contact in contact with the first fixed contact The second current direction in the second stationary contact and the fourth current direction in the movable contact contacting the second stationary contact are the same.

In the electromagnetic switching device according to the present invention, the first current direction and the second current direction are opposite to each other.

In the electromagnetic switching device according to the present invention, the first current direction in the first fixed contact is in the first current path section in the first fixed contact, the second current direction in the second fixed contact is in the second current- In the second current path section.

The electronic switching device according to the present invention is characterized in that the first current path section in the first stationary contact and the second current path section in the second stationary contact are formed separately from each other.

In the electromagnetic switching device according to the present invention, the first current direction at the movable contact is within the first current path section in the movable contact, and the second current direction at the movable contact is within the second current path section within the movable contact .

The electromagnetic switch device according to the present invention is characterized in that the first current path section in the movable contact and the second current path section in the movable contact are formed separately from each other.

The electromagnetic switching device according to the present invention is characterized in that each of the first and second stationary contacts is provided with first and second stationary contact portions for contact with the stationary contact.

The electromagnetic switching device according to the present invention is characterized in that the movable contact is provided with a positive terminal and a negative terminal on both sides of the movable contact.

The electromagnetic switching device according to the present invention generates suction force in a direction in which the first and second stationary contacts and the movable contact are pulled by the current flowing in the same direction as the contact pressure spring and the shaft when an instantaneous short circuit current is generated .

The electromagnetic switching device according to the present invention generates electromagnetic repulsive force (EMR) at the movable contact when an instantaneous short circuit current is generated, but the electric current direction of the fixed contact and the movable contact due to the Lorentz's force In the same way, the electromagnetic force (EMR) can be reduced due to the attractive force generated in the direction of pulling each other, so that the protection performance of the relay can be further improved under the instantaneous short circuit current.

1 is a cross-sectional view showing an electromagnetic opening / closing apparatus according to the present invention.
Fig. 2 is an enlarged cross-sectional view of the portion "A" in Fig. 1, and is a perspective view schematically showing the contact structure of the movable contact and the fixed contact in the electromagnetic opening / closing device according to the present invention.
3 is a plan view schematically showing a current path and a current direction at a stationary contact of the electromagnetic opening / closing apparatus according to the present invention.
4 is a plan view schematically showing a current path and a current direction at the movable contact of the electromagnetic opening / closing apparatus according to the present invention.
5 is a plan view schematically showing a current path and a current direction when the movable contact and the stationary contact of the electromagnetic switching device according to the present invention are in contact with each other.

Hereinafter, an electromagnetic switching device according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a cross-sectional view showing an electromagnetic opening / closing apparatus according to the present invention.

As shown in FIG. 1, the electronic switching apparatus 100 includes a soot unit 110 and a driving unit 120. The SOHO unit 110 is connected to an external device to supply power, and the driving unit 120 controls the opening and closing of the contact by using an electrical signal to supply or cut off power to the SOHO unit 110 connected to the external device.

The SOHO unit 110 supplies or cuts off the power to the external device according to whether the contact of the driving unit 120 is controlled or not. The SOHO unit 110 includes a pair of first and second stationary contacts 111a and 111b, a movable contact 112, (114).

The first and second fixed contacts 111a and 111b are connected to an external device to supply power and the movable contact 112 is positioned at the lower ends of the pair of first and second fixed contacts 111a and 111b, 2 contact or separate with the fixed contacts 111a and 111b to supply or cut off power to the external device.

The housing 114 is formed of a heat-resistant material such as ceramic or the like and is connected to the driving part 120 to form the first and second fixed contacts 111a and 111b and the movable contact 112 of the small- And the contact spring 113 and the shaft 130 can be received therein and protected from the outside.

More specifically, the lower part of the housing 114 is formed in an open box shape and is mounted on the upper part of the driving part 120. The upper part of the housing 114 is provided with a terminal hole, Two fixed contacts 111a and 111b, and a fixed terminal (not shown) are inserted.

The first and second fixed contacts 111a and 111b are disposed on the upper end of the housing 114 and the lower and upper ends of the fixed contact 111a and 111b are coupled to the shaft 130 to be in contact with and separated from the first and second fixed contacts 111a and 111b The movable contact 112 is disposed.

As described above, the first and second fixed contacts 111a and 111b and the movable contact 112 included in the housing 114 can be accommodated in the arc-extinguishing space in which insulating gas is mixed and sealed.

Accordingly, it is possible to reduce the noise generated by the contact between the first and second fixed contacts 111a and 111b and the movable contact 112 during the opening and closing operation of the electromagnetic opening / closing apparatus 100, and improve the arc extinguishing function.

On the other hand, when the movable contact 112 is in contact with the first and second fixed contacts 111a and 111b, the movable contact 112 is moved to the lower side of the movable contact 112 in a direction to be separated from the first and second fixed contacts 111a and 111b 112 are provided with a contact spring 113 for applying an elastic force.

The contact pressure spring 113 is located between the movable contact 112 and a portion protruding above the shaft 130 to be described later.

Through the contact spring 113, the movable contact 112 can maintain contact with the first and second fixed contacts 111a and 111b at a predetermined pressure or higher. In addition, the contact pressure spring 113 reduces the moving speed of the movable core 123 and the shaft 130 when the movable contact 112 is separated from the first and second fixed contacts 111a and 111b, 123 and the cylinder 125 is reduced, so that noise and vibration can be suppressed.

Meanwhile, the driving unit 120 performs opening and closing control through an actuator (not shown). That is, the electronic switching device 100 switches the external device connected to the electronic switching device 100 by the vertical movement of the driving part 120 through the actuator.

The driving unit 120 that controls the opening and closing of the contact through the actuator includes the coil 121, the fixed core 122, and the movable core 123 as described above. When the current is supplied, the coil 121 generates a magnetic force by the supplied current to generate the driving force of the contact. The movable core 123 engages with the shaft 130 to perform up and down movement together with the shaft 130.

The fixed core 122 is formed at the upper end position corresponding to the movable core 123 and the movable core 123 and the fixed core 122 are accommodated in the cylinder 125 installed through the center of the coil 121 do.

The cylinder 125 has the same shape as the container in which the stationary coil 122 and the movable coil 123 are accommodated and the outer diameter of each of the stationary coil 122 and the movable coil 123 is approximately equal to the inner diameter of the cylinder 126 As shown in Fig.

The stationary core 122 and the movable core 123 accommodated in the cylinder 125 form a magnetic path through which the magnetic flux generated by the coil 121 is transmitted. Accordingly, the movable core 123 has a driving force that moves in the up and down direction by the magnetic flux generated by the coil 121.

On the other hand, a return spring 125 is positioned between the movable core 123 and the fixed core 122. When the movable core 123 moves upward due to the magnetic flux generated by the coil 121 and contacts the fixed core 122, the return spring 125 returns the movable core 123, which is in contact with the fixed core 122, An elastic force is applied to the movable core 123 in a direction to separate the fixed core 122 from the fixed core 122. [ Thus, the movable core 123 in contact with the fixed core 122 returns to the initial position and separates from the fixed core 122.

A through hole 127 is formed in the central portion of the fixed core 122 and the movable core 123 so as to penetrate through the notched portion 110 and the driving portion 120 in the axial direction. (130) is inserted.

The upper end of the shaft 130 supports the movable contact 112 and the movable core 123 is coupled to the lower end of the shaft 130 to transmit the up and down movement of the movable core 123 to the movable contact 112. Accordingly, the movable contact 112 can maintain a contact state with the first and second fixed contacts 111a and 111b through the contact spring 113 at a predetermined pressure or higher.

When a current is supplied to the signal line connected to the coil 121, a magnetic flux is generated in the vicinity of the coil 121. The movable core 123 is attracted to the fixed core 122 and the movable core 123 and the fixed core 122 are brought into contact with each other do. That is, the shaft 130 coupled with the movable core 123 moves upward together, and the movable core 123 and the fixed core 122 come into contact with each other.

As the movable core 123 and the fixed core 122 are in contact with each other, the movable contact 112 supported at the upper end of the shaft 130 passing through the small-diameter portion 110 side is connected to the first and second fixed contacts 111a, and 111b.

As the first and second fixed contacts 111a and 111b and the movable contact 112 are in contact with each other, the first and second fixed contacts 111a and 111b connected to the external device are electrically connected to the power source To the apparatus side.

On the other hand, when the current flowing through the signal line connected to the coil 121 is cut off, the magnetic force of the coil 121 is stopped. The driving force of the movable core 123 is lost and returned to the initial position by the return spring 125 disposed between the movable core 123 and the fixed core 122. [

At this time, the shaft 130 combined with the movable core 123 also returns to the initial position. The movable core 123 in contact with the fixed core 122 engaged with the shaft 130 by the return spring 125 is returned to the initial position and then moved to the upper end of the shaft 130 passing through the small- And the movable contacts 112, which are held in contact with the first and second fixed contacts 111a and 111b, are separated from each other.

Accordingly, the movable contact 112 supported on the upper end of the shaft 130 is returned to the initial position, so that the power supply to the first and second fixed contacts 111a and 111b is interrupted and the power supply to the external device is interrupted.

The first and second fixed contacts 111a and 111b and the movable contact 112 (or 112a and 111b) are moved up and down by the shaft 130 coupled with the movable core 123 moving up and down according to the magnetic flux generated by the coil 121, ) Can be made or disconnected to supply or block power to the external device.

Fig. 2 is an enlarged cross-sectional view of the portion "A" in Fig. 1, and is a perspective view schematically showing the contact structure of the movable contact and the fixed contact in the electromagnetic opening / closing device according to the present invention.

2, the relay portion of the electromagnetic opening / closing apparatus 100 according to the present invention includes:

A pair of first and second stationary contacts 111a and 111b and a pair of first and second stationary contacts 111a and 111b disposed below the pair of first and second stationary contacts 111a and 111b. When the relay unit is turned on, And a movable contact 112 in the form of a plate contacting the first and second fixed contacts 111a and 111b.

The first and second stationary contacts 111a and 111b are provided with first and second stationary contact portions 141a and 141b for contact with the stationary contact point 112, respectively.

A positive terminal 112a and a negative terminal 112b are provided on the left and right sides of the plate-like movable contact 112, respectively.

3 is a plan view schematically showing a current path and a current direction at a stationary contact of the electromagnetic opening / closing apparatus according to the present invention.

As shown in FIG. 3, first and second current path sections 152 and 154 are formed at angles of a pair of first and second stationary contacts 111a and 111b, respectively. At this time, the first and second current path sections 152 and 154 of the first and second stationary contacts 111a and 111b are formed separately from each other.

In the first current path section 152 of the first and second current path sections 152 and 154, the current flows in the first current direction 162 in the clockwise direction. In the first current path section 152, The current flows in the second current direction 164, which is counterclockwise,

4 is a plan view schematically showing a current path and a current direction at the movable contact of the electromagnetic opening / closing apparatus according to the present invention.

As shown in FIG. 4, third and fourth current path sections 172 and 174 are formed in the plate-like movable contact 112, respectively. At this time, the third and fourth current path sections 172 and 174 are formed separately from each other. At this time, the third and fourth current path sections 172 and 174 in the movable contact 112 are formed separately from each other.

In the third current path section 172 of the third and fourth current path sections 172 and 174, the current flows in the third current direction 182 in the clockwise direction. The current flows in the fourth current direction 184 which is counterclockwise.

Here, the third current direction 182 is the same direction as the first current direction 162, and the fourth current direction 184 is the same direction as the second current direction 164.

5 is a plan view schematically showing a current path and a current direction when the movable contact and the stationary contact of the electromagnetic switching device according to the present invention are in contact with each other.

5, a current flows in the fifth current direction 192 between the first fixed contact 111a having the first fixed contact contacting portion 141a and the movable contact 112, A current flows in the sixth current direction 194 between the second fixed contact 111b having the contact portion 141b and the movable contact 112. [

At this time, current flows in the fifth current direction 192 from the positive terminal 112a of the movable contact 112 to the first fixed contact contacting portion 141a of the first fixed contact 111a. In the sixth current direction 194, current flows from the second fixed contact contact portion 141b of the second fixed contact 111b toward the negative terminal 112b of the movable contact 112. [

In this case, the fifth current direction 192 is the same as the first current direction 162 and the third current direction 182 in FIGS. 3 and 4, The second current direction 164 and the fourth current direction 184 are the same.

A current flows in the seventh current direction 196 between the first stationary contact 111a and the second stationary contact 111b and the movable contact 112. [ At this time, current flows in the seventh current direction 196 from the first fixed contact 111a to the second fixed contact 111b via the lower movable contact 112. [

The first current direction 164 in the second fixed contact 111b having the second fixed contact contact portion 141b and the first current direction 164 in the movable contact 112 having the second movable contact contact portion 142b Lt; RTI ID = 0.0 > 184 < / RTI >

As described above, when the relay unit is turned on, the current flows in the direction of the arrow, that is, the fifth current direction at the movable contact 112 that contacts the first stationary contact 111a, and the contact with the second stationary contact 111b And the sixth current direction in the movable contact 112 which is in the opposite direction to the first direction. 5, the fifth current direction 192 from the positive terminal 112a of the movable contact 112 to the first fixed contact 111a with the first fixed contact contacting portion 141a, Is the same as the first current direction 162 in the first fixed contact 111a in Fig. 3 and the third current direction 182 in the movable contact 112 in Fig. 5, the sixth current direction 194 from the second fixed contact 111b to the negative terminal 112b of the movable contact 112 is the same as the direction of the second fixed contact 111b in Fig. 3, And the fourth current direction 184 in the movable contact 112 in Fig. 4 are identical to each other.

Therefore, when an instantaneous short circuit current occurs, an electromagnetic repulsive force (EMR) occurs in the moving contact 112, but the electromagnetic repulsion force (EMR) occurs in the current flowing in the same direction as the contact spring 113 and the shaft 130 The first and second fixed contacts 111a and 111b and the movable contact 112 generate suction force in the direction of pulling each other due to Lorentz's force.

As a result, the electromagnetic repulsive force (EMR) is reduced, and the protection performance of the relay can be further improved under a short circuit current.

As described above, the electromagnetic switching device according to the present invention generates electromagnetic repulsive force (EMR) at the movable contact when an instantaneous short circuit current is generated, but the influence of the Lorentz's force causes the fixed contact and the movable contact The EMR can be reduced by generating attraction force in the direction of pulling each other with the same current direction so that the protection performance of the relay can be further improved under instantaneous short circuit current.

Although the embodiments have been described with reference to the drawings, the present invention is not limited thereto.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

100: Electronic switching device 110:
111a, 111b: first and second fixed contacts 112: movable contacts
112a: Positive (+) terminal 112b: Negative (-) terminal
113: contact pressure spring 114: housing
141a, 141b: first and second fixed contact contact portions

Claims

A pair of first and second fixed contacts connected to an external device and a second fixed contact disposed at a lower end of the first and second fixed contacts and being in contact with or separated from the first and second fixed contacts to supply or cut off power to the external device And a movable contact to which the movable contact is connected;
The first current direction at the first stationary contact and the third current direction at the movable contact contacting the first stationary contact are the same,
Wherein the second current direction in the second stationary contact and the fourth current direction in the movable contact in contact with the second stationary contact are the same.

The electronic switching device according to claim 1, wherein the first current direction and the second current direction are opposite to each other.

The electronic switching device according to claim 1, wherein the first current path section in the first stationary contact and the second current path section in the second stationary contact are formed separately from each other.

The movable contact according to claim 1, characterized in that the first current direction at the movable contact point is within a first current path section within the movable contact point, and the second current direction at the movable contact point is within a second current path section within the movable contact point .

The electromagnetic switching device according to claim 1, wherein the first current path section in the movable contact and the second current path section in the movable contact are formed separately from each other.

The electromagnetic switching device according to claim 1, wherein the first and second stationary contacts are provided with first and second stationary contact portions for contacting the stationary contact.

The electromagnetic opening / closing apparatus according to claim 1, wherein positive and negative terminals are provided on both sides of the movable contact.

2. The method according to claim 1, characterized in that, when an instantaneous short circuit current occurs, a suction force is generated in a direction in which the first and second fixed contacts and the movable contact point are pulled by the current flowing in the same direction as the contact pressure spring and the shaft .