KR20160012489A - Electro-magnetic contactor having function for protecting interruption of electric power a moment of elevator and protecting low voltage - Google Patents

Abstract

The present invention relates to an electromagnetic contactor with instantaneous power failure protection and low-voltage protection functions. The electromagnetic contactor according to a preferred embodiment of the present invention comprises a first power storage unit which is charged by an external power source used for an input operation; an open-side coil which performs an opening operation by using electric charges charged in the first power storage unit; an open-side transistor which regulates the flow of the electric charges in the open-side coil, wherein the open-side transistor is turned on by the electric charges charged in the first power storage unit; an instantaneous power failure protection switching unit which is connected to a line where the first power storage unit supplies the electric charges to the open-side transistor in parallel with the open-side transistor; a second power storage unit which starts the discharge by the interruption of charging voltage when an opening event occurs and delays the on of the open-side transistor by the electric charges stored in the first storage unit, by turning on the instantaneous power failure protection switching unit during a predetermined discharge time by the supply of the electric charges to the instantaneous power failure switching unit during the predetermined discharge time; a first varistor which is disposed between the line for supplying the charging voltage and the second power storage unit; and a second varistor which is installed on a line to which a control signal for turning on an input-side transistor is supplied and whose resistance value changes by the external power source. The first varistor prevents the charging voltage from being supplied to the second power storage unit by the increased resistance value when the external power source is below a predetermined voltage. The second varistor prevents the input-side transistor from being turned on by the control signal, wherein the resistance value is maintained over a predetermined value if the external power source does not increase over a predetermined voltage.

Description

ELECTROMAGNETIC CONTACTOR HAVING FUNCTION FOR PROTECTING INTERRUPTION OF ELECTRIC POWER A MOMENT OF ELEVATOR AND PROTECTING LOW VOLTAGE

The present invention relates to an electromagnetic contactor capable of preventing an unnecessary ON / OFF operation every instantaneous power failure.

A driving device is a device that moves a power mechanism such as a machine or a measuring instrument. Examples of such a driving apparatus that is often used in a power system include an electromagnetic contactor, an electromagnetic switch, and a circuit breaker. A magnetic contactor (MC) is used to open and close a power circuit in a drive circuit such as a motor. This normally constitutes an electromagnetic switch (MS) (magnetic switch or electro-magnetic switch) together with an overload relay (overload relay).

The electromagnetic contactor is a type of electromagnetic relay with large contact capacity and withstand voltage. It is used to open / close large currents and to control starting and stopping of motors by opening and closing contacts using electromagnetic force. It mainly uses electric power of 250V / 10A or more .

A circuit breaker (CB) is installed at the transmission or receiving end of the transmission line to block the fault current applied to the power system to protect the load (electric machine or electric facility). The circuit breaker can be classified into a circuit breaker and a circuit breaker. Generally, the earth leakage breaker blocks both leakage and overcurrent, and the circuit breaker of the wiring breaks only the overcurrent without the leakage current being protected. Examples of the earth leakage breaker include ELB (Electric Leakage Breaker), ELCB (Earth Leakage Circuit Breaker), and the like. Examples of the circuit breaker include a motor starter (MMS: Manual Motor Starter) including a Molded Case Circuit Breaker (MCCB), a No Fault Breaker (NFB), and the like.

In the mechanical device requiring an electric device such as an electromagnetic contactor, an electromagnetic switch, a breaker or the like, or a movement mechanism which cyclically or intermittently reciprocates at a certain distance, the actuator is moved to either one of the positions (first position) (Driving force generating mechanism) for linear reciprocating motion to a distant position (second position).

For example, in an actuator used in a drive device such as an electromagnetic contactor, an electromagnetic switch, or a breaker, when the movable member of the actuator moves to the first position, the circuit contact of the drive device is turned on (contact ON or CLOSE state) The circuit contact of the drive device is opened (contact OFF or OPEN state) when moved to the second position opposite to the position.

In the actuator, a permanent magnet is usually opposed to a fixed iron core, a mover coil having a coil wound around a magnetic field of the permanent magnet is arranged, and when a forward or reverse current is applied to the mover coil, the magnetic field by the permanent magnet and the current density (First position) or downward (second position) by an electromagnetic repulsive force generated by the electromagnetic force generated by the electromagnetic coil. Such a manipulator utilizes the magnetic repulsive force before the Fleming's left-hand rule. Since the manipulator utilizes the repulsive force of the permanent magnet and the coil, there is an advantage that the movement length is limited and a large force can be exerted. (Eg high voltage circuit breaker).

However, since the actuator has the above-described configuration, since the coil itself moves as a mover, it is difficult to supply current to the moving mover coil, and the structure design for electrical insulation design and mechanical impact resistance of the mover coil becomes complicated.

Korean Patent No. 968462, Korean Patent Publication No. 2011-0094658, and Korean Patent No. 1068155, which are filed by the present applicant, are disclosed.

However, the above prior art documents disclose that when the instantaneous power failure and the instantaneous drop voltage (Sag) are generated, the lifetime is reduced due to unnecessary on / . Particularly, there has been a problem that the lifetime of the electromagnetic contactor is lowered due to the on / off operation of the electromagnetic contactor even in the occurrence of instantaneous power failure and the instantaneous drop voltage (Sag) of several ms without affecting the electronic equipment.

1. Korea Patent No. 968462 2. Korean Patent Publication No. 2011-0094658 3. Korean Patent No. 1068155

SUMMARY OF THE INVENTION It is an object of the present invention to provide an electromagnetic contactor capable of preventing unnecessary on / off operation at instantaneous power failure and instantaneous drop voltage.

According to an aspect of the present invention, there is provided an electromagnetic contactor comprising: a first power storage unit that is charged by an external power source used for a charging operation; An open-side transistor for interrupting the charge flow to the open-side coil, the open-side transistor being turned on by the charge charged in the first power storage unit, the first power storage unit being connected to the open- An instantaneous charge preventing switching unit connected in parallel with the open-circuit transistor to a line for supplying charge, and a charge stopping unit for starting discharging when the charge voltage is cut off when an open event occurs, By turning on the instantaneous power failure prevention switching section for the predetermined discharge time, A second power storage unit for delaying the opening of the open-side transistor by the charge accumulated in the first power storage unit, a first varistor disposed between the line for supplying the charging voltage and the second power storage unit, And a second varistor provided on a line to which a control signal for ON is supplied and whose resistance value changes according to the external power source.

The first varistor may prevent the charging voltage from being supplied to the second power storage unit by increasing the resistance value when the external power supply is below a predetermined voltage.

The second varistor maintains a predetermined resistance value or more when the external power supply does not rise above a predetermined voltage, thereby preventing the turning-on transistor from being turned on by the control signal.

As described above, according to the present invention, it is possible to prevent unnecessary on / off operation of the electromagnetic contactor by delaying the on or off operation for a predetermined time when instantaneous power failure or instantaneous drop voltage is generated. In this way, the lifetime of the electromagnetic contactor can be extended.

1 is a configuration diagram showing a configuration of a distribution board according to an embodiment of the present invention.
2 is a block diagram showing the configuration of a motor control panel according to an embodiment of the present invention.
3 is a cross-sectional view of the electromagnetic contactor shown in Figs. 1 and 2. Fig.
4 is a diagram for explaining driving of a driving device according to the first embodiment of the present invention.
5 is a view schematically showing a configuration of a driving device for instantaneous blackout prevention according to the first embodiment of the present invention.
6 is a view schematically showing a configuration of a driving device for instantaneous blackout prevention according to a second embodiment of the present invention.
7 is a view schematically showing a configuration of a driving device for instantaneous blackout prevention according to a third embodiment of the present invention.
8 is a cross-sectional view illustrating an actuator to which the driving device according to the fourth embodiment of the present invention is applied.
FIG. 9 is a view schematically showing a configuration of a driving device for instantaneous blackout prevention according to a fourth embodiment of the present invention.
10 is a view schematically showing a configuration of a driving device incorporating a low voltage prevention function according to a fifth embodiment of the present invention.
11 is a view schematically showing a configuration of a driving device incorporating a low voltage prevention function according to a sixth embodiment of the present invention.
FIG. 12 is a view schematically showing a configuration of a driving device incorporating a low-voltage preventing function according to a seventh embodiment of the present invention.
FIG. 13 is a view schematically showing a configuration of a driving device for preventing an input state when a voltage is lower than a reference voltage according to the ninth embodiment of the present invention.
FIG. 14 is a view schematically showing a configuration of a driving device for preventing an input state when a voltage is lower than a reference voltage according to a tenth embodiment of the present invention.
FIG. 15 is a view schematically showing a configuration of a driving device for preventing an input state when a voltage is lower than a reference voltage according to an eleventh embodiment of the present invention.

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail. It should be understood, however, that the invention is not intended to be limited to the particular embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

Like reference numerals are used for like elements in describing each drawing. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

The terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.

For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component.

And / or < / RTI > includes any combination of a plurality of related listed items or any of a plurality of related listed items.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, .

On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention.

The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the terms "comprises" or "having" and the like are used to specify that there is a feature, a number, a step, an operation, an element, a component or a combination thereof described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Do not.

1 is a configuration diagram showing a configuration of a distribution board according to an embodiment of the present invention. 1, the distribution board 10 may include a main breaker 11, a switching unit 12, and a load unit 13.

An R-phase busbar R, an S-phase busbar S, a T-phase busbar T and an N-phase busbar N can be placed at the output terminals of the main breaker 11 and MCCB, 12 may be located on the power supply lines of the R phase busbar R and the N phase busbar N. [ The switching unit 12 is turned on so that the power supplied through the power supply lines of the R-phase busbar R and the N-phase busbar N can be output to the load unit 13.

2 is a block diagram showing the configuration of a motor control panel according to an embodiment of the present invention. 2, the electric motor control board 20 may include a main breaker 21, a plurality of switching units 22-1 to 22-3, and an electric motor 23. [

An R-phase busbar R, an S-phase busbar S, a T-phase busbar T and an N-phase busbar N may be positioned at the output ends of the main breaker 21 and MCCB. The switching units 22-1 to 22-3 are provided on the power supply lines of the N-phase busbar N, the R-phase busbar R, the S-phase busbar S and the T- Lt; / RTI > Here, by turning on the switching units 22-1 to 22-3, the power supplied through each power supply line can be supplied to the electric motor 23.

On the other hand, the switching unit 12 of FIG. 1 and the switching units 22-1 to 22-3 of FIG. 2 may be implemented as electromagnetic contactors and may be implemented in various embodiments of FIGS.

For explanations of the operation of inputting and opening of the electromagnetic contactor, this can be explained with reference to Fig. 3 and Fig.

3 is a cross-sectional view of the electromagnetic contactor shown in Figs. 1 and 2. Fig. For the sake of understanding, the operation of the electromagnetic contactor will be described with the drive device of the present invention excluded. Hereinafter, the process of driving the electromagnetic contactor according to the control of the drive device with the drive device connected will be described do.

Referring to FIG. 3, the electromagnetic contactor 100 is formed by combining a lower case 111 and an upper case 112. A plurality of power source side terminals 171 and a load side terminal 172 are partially exposed in the front and rear directions of the upper case 112.

The power supply side terminal 171 may be connected to the R phase busbar R and the N phase busbar N in the distribution board 10 of FIG. (R, S, T, N).

The load side terminal 172 may be connected to the load 13 of the distribution board 10 in FIG. 1 and may be connected to the electric motor 23 of the motor control board 20 in FIG.

The movable contact assembly 150 is coupled to an upper portion of the operation device 1000a provided inside the case 111, The mover element 1200 is integrally coupled to the holder 151 of the movable contact assembly 150 via an extension shaft 1262 and a mating shaft 1264 thereof. Accordingly, the movable contact assembly 150 linearly moves up and down together with the mover element 1200.

The movable contact assembly 150 includes a holder 151, a movable contact 160, and a spring 163. The movable contact 160 is always installed under the elastic force of the spring 163 downward.

Movable contacts 161 and 162 are formed at both ends of the movable contactor 160, respectively. The power source side terminal 171 and the load side terminal 172 are provided on both sides of the upper case 112 corresponding to the movable contacts 161 and 162. Fixed contacts 181 and 182 are formed on the terminals 171 and 172, respectively.

On the other hand, auxiliary terminals 190 are provided on one side of the case 111, 112. The auxiliary terminal 190 is connected to an external feeder line for feeding current to the input side coil 1140 and the open side coil 1150.

The stator element 1100 of the manipulator 1000a is installed at the bottom of the lower case 111. [ The movable contact assembly 150 of the electromagnetic contactor 100 is moved upward so that the electromagnetic contactor 100 is in the open state (OFF state) when the mover element 1200 of the operation device 1000a is operated to the second upper position At this time, since the contacts 161 and 162 of the movable contactor 160 are separated from the contacts 181 and 182 of the terminals 171 and 172, the power supplied to the load side is cut off.

On the other hand, when a current is applied to the open side coil 1150 of the operation device 1000a, the mover element 1200 is pushed up by the repulsive force of the stator element 1100 and the elastic restoring force of the opening spring 2000. When the mover element 1200 cuts off the current applied to the open-side coil 1150 at the position (second position: open position) where the mover element 1200 has moved to the upper end, And held and held at the open position (second position) only by the elastic force.

When the mover element 1200 is moved upward and held at the opening completion position as described above, the holder 151 integrally coupled to the mover element 1200 also maintains the upward movement, so that the contact point 161 of the movable contactor 160 162 are separated from the contacts 181, 182 of the terminals 171, 172, so that the circuit keeps the OFF state constantly.

The movable contact assembly 150 of the electromagnetic contactor 100 is moved downward so that the electromagnetic contactor 100 is in the closing state (ON state) At this time, the contacts 161 and 162 of the movable contactor 160 are attached to the contacts 181 and 182 of the terminals 171 and 172, and power is supplied to the load side.

That is, when a current is applied to the input side coil 1140 of the manipulator 1000a, the mover element 1200 is pulled down toward the stator element 1100. [ When the current applied to the input side coil 1120 is cut off at the position where the mover element 1200 moves downward (the first position: the closing position), the magnetic field caused by the stator element 1100 disappears, The element 1200 is held in the insertion position by attraction between the permanent magnet 1220 and the fixed core core 1120.

When the mover element 1200 is moved downward and held at the loading completion position, the holder 151 integrally coupled to the mover element 1200 is continuously moved downward. Then the contacts 161 and 162 of the movable contactor 160 are stuck to the contacts 181 and 182 of the terminals 171 and 172 so that the circuit keeps on the ON state continuously.

On the other hand, the operation of the drive device that controls the current applied to the input side coil 1140 and the open side coil 1150 to control the operation of the actuator can be explained with reference to FIG.

Hereinafter, the device driving circuit of the present invention will be described. The device driving circuit of the present invention includes a first power storage unit that is charged by a power source supplied to an input side coil during an input operation of an input side coil, an open side coil that performs an opening operation by using charges charged in the first power storage unit, An open-side switch for interrupting the charge flow to the side coil is turned on by the charge charged in the first power storage unit, and the first power storage unit supplies the charge to the open- When the connected instantaneous power failure preventing switching unit and the open event are generated, the charging voltage is cut off to start the discharging. Charge is supplied to the instantaneous power failure preventing switching unit during the predetermined discharging time, And a second power storage unit for preventing the open-side switch from being turned on by the charge stored in the first power storage unit, The. Hereinafter, the above driving circuit will be described in detail.

4 is a diagram for explaining driving of a driving device according to the first embodiment of the present invention. The driving device 300 controls driving of the actuator 1000a of the electromagnetic contactor 100 shown in Fig. 3 and is implemented on one circuit board, for example, Or may be connected to the auxiliary terminal 190 through a wire.

4, the driving device 300 includes a power supply unit 310, a bridge rectification unit 320, a gate control unit 330, an input side switch 340, a first power storage unit 350, and an open side switch 360 ). Here, the input-side switch 340 and the open-side switch 360 may be implemented by a SCR (Silicon Controlled Rectifier) or a transistor. On the other hand, FIG. 4 illustrates the case of the input side SCR (Silicon Controlled Rectifier) 340 and the open side SCR 360.

The output side line of the bridge rectification unit 320 and the input side line of the input side SCR 340 are connected to the input side coil 1140 and the output side line of the input side SCR 340 and the side line of the open side SCR 340 Is connected to the open-side coil 1150. The open- Here, the input side coil 1140 and the open side coil 1150 are shown with simple symbols for the sake of understanding, and their function and role are the same as the input side coil 1140 and the open side coil 1150 shown in FIG. 3 Do.

When external power is applied through the power supply unit 310, the bridge rectifier 320 rectifies the current. Bridge rectification section 320 may include, for example and without limitation, a pair of forward diodes 322 and 326 for passing only forward currents and a pair of reverse diodes 324 and 328 for passing only current in the reverse direction. As shown in Fig.

The gate control unit 330 generates a control signal that turns on the turn-on SCR 340 and turns off the open-side SCR 360 (TURN-OFF) ). When the input side SCR 340 is turned on, a current flows through the input side coil 1140, so that the movable element 1600 shown in FIG. 1 moves downward, Contact the fixed contacts 181 and 182.

On the other hand, when the input side SCR 340 is turned on, a current flows in the input side SCR 340 and a current flows into the first power storage unit 350 disposed at the output side of the input side SCR 340, Charges accumulate. When the first storage portion 350 is formed of a capacitor, the charging time of the capacitor is determined according to the capacitance of the capacitor and the charging voltage level.

When the first power storage unit 350 is completely charged, the flow of current is stopped even when external power is applied, and the movable contacts 161 and 162 of the electromagnetic contactor 100 and the fixed contacts 181 and 182 are brought into contact with each other State. That is, when the current flow applied to the input side coil 1120 is stopped, the magnetic field caused by the stator element 1100 disappears, and the mover element 1200 moves the attraction force between the permanent magnet 1220 and the fixed core core 1120 As shown in Fig.

On the other hand, when the external power is cut off and the power supply through the power supply unit 310 is interrupted, the gate control unit 330 generates a control signal for turning off the input side SCR 340 and outputs the open side SCR 360 And generates a control signal for turning on the switch.

When the open side SCR 360 is turned on, the charge stored in the first storage portion 350 is discharged toward the open side SCR 360, and a current flows through the open side coil 1150. When the current is applied to the open side coil 1150, the mover element 1200 is pushed up by the repulsive force with the stator element 1100 and the elastic restoring force of the opening spring 2000, as described above.

When the movable element 1200 is moved up and held at the open completion position, the holder 151 integrally coupled to the movable element 1200 is also moved upward so that the movable contact 161 of the movable contact 160 Is separated from the fixed contacts 181 and 182 of the terminals 171 and 172 so that the circuit is maintained in the OFF state.

The electric current stored in the first storage portion 350 is discharged and the current flowing through the open side coil 1150 is cut off so that the mover element 1200 can be opened only by the elastic force of the opening spring 2000 Position).

Meanwhile, the driving device 300 of FIG. 4 may be operated in an input state or an open state under the control of the gate control unit 330. Here, when the external voltage is interrupted, the gate control unit 330 can control each configuration to be changed from the closing state to the open state.

Accordingly, the gate control unit 330 is controlled to be in an open state even when an instantaneous power failure occurs. Therefore, it is necessary to control so that the input state can be maintained when an instantaneous power failure occurs. A driving device to which the instantaneous blackout prevention function is added can be described with reference to FIG.

≪ Embodiment 1 - Instantaneous power failure prevention >

5 is a view schematically showing a configuration of a driving device for instantaneous blackout prevention according to the first embodiment of the present invention. According to Fig. 5, the driving device 300 may further include a resistance element 370, a second power storage unit 380, and an instantaneous power failure control switch 390 in the configuration of Fig. Here, the resistance element 370 may be connected to the output side of the first power storage unit 350 and may be connected in parallel with the open side coil 1150. Further, it may be the case where the input side switch 350 and the open side switch 360 are implemented by SCR.

The gate control unit 330 applies a voltage to the input side SCR 340 and turns on the power source SCR 340 when the external power source is inputted through the power supply unit 310 and applies the voltage to the second power storage unit 380 as well. In addition, when the external power applied through the power supply unit 310 is cut off, the voltage applied to the second power storage unit 380 can be cut off.

The second power storage unit 380 is connected to the output side of the gate control unit 330 and can be a capacitor. The second storage unit 380 can be charged by receiving a voltage from the gate control unit 330. There is no limitation on the time for charging the second storage portion 380. For example, the gate control unit 330 may apply a voltage to the second power storage unit 380 in response to an input SCR turn-on.

Meanwhile, the second power storage unit 380 can discharge the charged voltage to the instantaneous power failure control switch 390 when the voltage applied from the gate control unit 330 is cut off due to the external power cutoff.

The instantaneous power failure control switch 390 is connected to the output side of the second power storage unit 380 and can be connected to the resistance element 370. That is, the instantaneous power failure control switch 390 can be connected in parallel with the open side SCR 360 to the line where the first power storage unit 350 supplies electric charge to the open side SCR 360.

Here, the instantaneous power failure control switch 390 may be a transistor, and in the present invention, an NPN BJT (Bipolar Junction Transistor) may be used.

When the voltage charged in the second power storage unit 380 is applied to the base of the instantaneous power failure control switch 390, the voltage charged in the first power storage unit 350 is supplied to the instantaneous power failure control switch 390 ) And can be output to the emitter.

That is, when the external power is cut off, the instantaneous power failure control switch 390 is turned on and discharges the charging voltage of the first power storage unit 350, so that the second power storage unit 380 is discharged and the instantaneous power failure control switch 390 is turned on. The current is not applied to the open-side coil 1150 until the turn-off coil 1150 is turned off. Thus, when an instantaneous power failure occurs, the electromagnetic contactor 100 can be kept in the closed state without being converted to the open state. As a result, the opening of the electromagnetic contactor 100 can be delayed by delaying the timing at which the open side SCR 360 is turned on when instantaneous power failure occurs. At this time, the delayed timing may vary depending on the electrostatic capacity of the second power storage unit 360 and the charging voltage level.

When the second power storage unit 380 is discharged, the instantaneous power failure control switch 390 is turned off, and the first power storage unit 350 energizes the open side coil 1150 to turn the open side SCR 360 - You can turn it on.

≪ Second Embodiment - Instantaneous power failure prevention >

6 is a view schematically showing a configuration of a driving device for instantaneous blackout prevention according to a second embodiment of the present invention. Further, it may be the case that the input side switch 450 and the open side switch 460 are implemented by transistors. 6, the driving device 400 includes a power supply unit 410, a bridge rectification unit 420, a gate control unit 430, a communication module 470, a first power storage unit 440, an input side transistor 450, An open-side transistor 460, a resistance element 491, a second power storage unit 492, and an instantaneous power failure control switch 493.

The driving device 400 shown in Fig. 6 differs from the driving device 300 shown in Fig. 5 in that the positions of the first power storage unit 440 and the resistance element 491 are different and the input side SCR Side transistor 450 and the open-side transistor 460 are used instead of the open-side SCR 360 and the communication module 470 are added. Since the functions and operations of the same configurations are the same as those of FIG. 5, the following description is omitted.

The first power storage unit 440 is connected to the output side of the bridge rectification unit 420 and the resistance element 491 can be connected to the output side of the first power storage unit 440. At this time, the resistance element 491 may be connected in parallel to the output side of the first power storage unit 440 and the open side coil 1150.

The central processing unit 480 includes a communication module 470 and a gate control unit 430. The communication module 470 generates a signal for remotely controlling the operation of the gate control unit 430. [ The central processing unit 480 checks whether external power is applied and whether an instantaneous power failure has occurred, and generates a signal for operating the gate control part 430 through the communication module 470.

Accordingly, when external power is applied, the gate control unit 430 turns on the input-side transistor 450 and can apply a voltage to the second power storage unit 492. [ On the other hand, when the external power source is shut off, the gate control unit 430 can cut off the voltage applied to the second power storage unit 492. [

The operation of the gate control unit 430 and the operation of the second power storage unit 492 and the instantaneous power failure control switch 493 according to the control of the gate control unit 430 can be performed in the same manner as described with reference to FIG. have.

When the input side transistor 450 is turned on, a current flows through the input side coil 1140, so that the movable element 1200 shown in FIG. 3 moves downward, Contact the fixed contacts 181 and 182.

On the other hand, when the input side transistor 450 is turned on, a current flows to the input side transistor 450, and a part of the current flows into the power storage unit 440 connected to the output side of the bridge rectification unit 420, (440) is charged. Unlike the input side coil 1140 of FIG. 5, when the external power is continuously applied, the input side coil 1140 of FIG. 6 is connected to the first power storage unit 440, .

Therefore, when a sufficient current flows in the input side coil 1140 and the closing state of the electromagnetic contactor 100 shown in FIG. 6 is completed, the input side transistor 450 is turned off so as to block the current flowing into the input side coil 1140 It is necessary to turn it off. The central processing unit 480 can control the operation time from the turn-on to the turn-off of the input transistor 450 and can remotely control the gate control unit 430 through the communication module 470 .

≪ Third Embodiment - Instantaneous power failure prevention &

7 is a view schematically showing a configuration of a driving device for instantaneous blackout prevention according to a third embodiment of the present invention. The configuration of the driving device 500 of FIG. 7 is similar to that of the driving device 400 of FIG. 6 except that a power line communication conversion module 590 is further added to the driving device 400 of FIG. Do.

The power line conversion module 590 communicates with the communication module 570 to perform communication via a power line. The information exchanged between the power line conversion module 590 and the communication module 570 is based on the interception / connection of the electric power. Also, when the electric power is interrupted / connected, Information to identify is also included. That is, the on / off state of the electromagnetic contactor 100 can be controlled depending on whether instantaneous power failure occurs due to the power line communication, and the ON or OFF state of the electromagnetic contactor 100 can be monitored. Furthermore, it is possible to configure the system so that the state of one electromagnetic contactor 100 can be monitored, and the power monitoring can be checked at the lowest end in the general office through the upper control computer.

8 is a cross-sectional view illustrating an actuator to which the driving device according to the fourth embodiment of the present invention is applied.

The actuator 1000b according to the present embodiment is different from the actuator 1000a shown in Fig. 3 only in the shape of the coil, and the remaining components are the same. 3, the input side coil 1140 and the open side coil 1150 are divided into two in the vertical direction. In the operation device 1000b according to the present embodiment, however, one Only the stator coil 1250 is provided.

The stator coil 1250 is wound in the center so as to form a through passage 1252 and the mover core 1300 is disposed in the through passage 1252 so as to be movable in the axial direction. A connecting member 1310 is attached to the upper end of the mover core 1300 so as to easily connect the mover core 1300 to the driven element while facilitating the installation of the opening spring 1500. [ In this embodiment, the connecting member 1310 is coupled to the mover core 1300 by a fastener 1312.

That is, a single stator coil 1250 is provided and a current of a forward direction or a reverse direction is applied to one stator coil 1250 so that the flow of the magnetic flux is formed in the forward direction or the reverse direction, To the second position. At this time, depending on the position, the stator coil 1250 can operate as an input side coil or an open side coil.

The stator coil 1250 may be wound around the bobbin 1254, and the through passage 1252 may be an inner diameter portion of the bobbin 1254. On the other hand, it is possible to use a winding in the shape of a closed curve as a known self-bonding type capable of maintaining the shape of the coil itself without using the bobbin 1254. At this time, the through passage 1252 becomes the inner diameter portion of the stator coil 1250.

When a forward current is applied to the stator coil 1250, a magnetic field is formed inside the stator coil 1250 and the mover core 1300 is magnetized. Thus, the mover core 1300 is pulled downward by the principle of the electromagnet following the Fleming's right-hand rule.

When the current applied to the stator coil 1250 is cut off at a position (first position) where the mover core 1300 moves downward to the end, the magnetic field generated by the stator coil 1250 disappears, Is held by the magnetic force of the permanent magnet 1400 in a state of being located at the first position. That is, even if no current is supplied to the stator coil 1250 after the mover core 1300 moves to the first position, the mover core 1300 is constrained to the first position by the magnetic force of the permanent magnet 1400 State.

On the other hand, when a reverse current is applied to the stator coil 1250 in a state where the mover core 1300 is located at the first position, the mover core 1300 is pulled upward, that is, to the second position.

When the current applied to the stator coil 1250 is cut off at a position (second position) where the mover core 1300 has moved to the upper end, the magnetic field generated by the stator coil 1250 disappears, Is held in the second position by the elastic force of the opening spring (1500). That is, even if no current is supplied to the stator coil 1250 after the mover core 1300 moves to the second position, the mover core 1300 is held in the second position by the elastic force of the opening spring 1500 Keep the status constant.

A movable contact assembly 150 as shown in Fig. 3 is coupled to an upper portion of the operation device 1000b having the configuration of Fig. 8 to constitute an electromagnetic contactor.

Hereinafter, a configuration of a driving device for applying a forward or reverse current to one of the stator coils 1250 will be described in detail.

<Fourth Embodiment - Instantaneous power failure prevention>

9 is a diagram for explaining driving of a driving device according to a fourth embodiment of the present invention.

The driving device 600 shown in Fig. 9 is different from the driving device 500 shown in Fig. 7 in that instead of using only one coil, two pairs of transistors are used.

The central processing unit 700 includes a communication module 690 and a gate control unit 630. The communication module 690 generates a signal for remotely controlling the operation of the gate control unit 630. [

The central processing unit 700 checks whether external power is applied, and generates a signal to operate the gate control part 630 through the communication module 690 when external power is applied. Thus, the gate control unit 630 generates a control signal for turning on the first input side transistor 650 and the second input side transistor 660, and the first open side transistor 670 and the second open side And generates a control signal that turns transistor 680 off.

When the first and second input transistors 650 and 660 are turned on, a forward current flows through the stator coil 1250, thereby moving the mover element 1300 shown in FIG. 8 downward do. Meanwhile, when external power is cut off and power supply through the power supply unit 610 is cut off, the gate control unit 630 can cut off the power supplied to the second power storage unit 720.

At this time, when the power supply is interrupted due to the instantaneous power failure of the power supply unit 610, the first power storage unit 640 is turned on by the instantaneous power failure prevention switch 730 being turned on by the discharge of the second power storage unit 720, It is possible to delay the opening of the electromagnetic contactor 100 by discharging the voltage charged in the instantaneous power failure. The operation when the instantaneous power failure occurs can be similarly performed as described with reference to FIG.

On the other hand, the drive circuit of the electromagnetic contactor incorporating the automatic discharge function of the present invention will be described. The driving device of the present invention may further include a varistor in the configuration of Figs. 5 to 9. Here, the first varistor may be located between the charging voltage supply line and the second power storage unit, and when the external power supply is below the predetermined voltage, the resistance value increases to prevent the charging voltage from being supplied to the second power storage unit can do. Hereinafter, this can be explained.

<Fifth Embodiment - Low Voltage Protection Function>

10 is a view schematically showing a configuration of a driving device incorporating a low voltage prevention function according to a fifth embodiment of the present invention. The driving device 300 according to FIG. 10 may further include a first varistor 391 in the configuration of the driving device of FIG.

The first varistor 391 may be connected to the output side of the bridge rectifier 320 to which the power of the power supply unit 310 is applied through the gate control unit 330.

Here, the varistor is a device having a characteristic that a resistance value increases as a voltage applied is low. Accordingly, when the instantaneous voltage drop occurs, the first varistor 391 increases in resistance and blocks the power supply to the gate control unit 330 applied to the second power storage unit 380, 100 can be delayed.

5, the operation of the second power storage unit 380 may be performed when the power of the gate control unit 330 is shut off. Accordingly, it is possible to delay the opening of the electromagnetic contactor 100 upon occurrence of the instantaneous power failure and the instantaneous voltage drop (SAG).

&Lt; Sixth Embodiment-Low Voltage Protection Function >

11 is a diagram schematically showing a configuration of a driving device for incorporating a low voltage prevention function according to a sixth embodiment of the present invention. 11, the communication module 470 is removed from the configuration of the driving device of Fig. 6, and the first varistor 494 may be added. 11 includes a power supply unit 410, a bridge rectification unit 420, a gate control unit 430, a first power storage unit 440, an input side transistor 450, an open side transistor 460, A resistance element 491, a second power storage unit 492, an instantaneous power failure control switch 493, and a first varistor 494. [

The first varistor 494 may be connected to the output side of the bridge rectifier 420 to which the power of the power supply unit 410 is applied through the gate control unit 430.

Here, the varistor is a device having a characteristic that a resistance value increases as a voltage applied is low. Accordingly, when the instantaneous voltage drop occurs, the resistance of the first varistor 494 increases to shut off the power supply to the gate control unit 430 applied to the second power storage unit 492, 100 can be delayed.

Meanwhile, when the gate control unit 430 is powered off, the operation of the second power storage unit 492 may be performed in the same manner as in FIG. Accordingly, it is possible to prevent the electromagnetic contactor 100 from being opened when instantaneous power failure and instantaneous voltage drop (SAG) occur.

&Lt; Seventh embodiment - Low voltage prevention function >

FIG. 12 is a view schematically showing a configuration of a driving device incorporating a low-voltage preventing function according to a seventh embodiment of the present invention. In the driving device 600 of FIG. 12, the communication module 690 is removed from the configuration of the driving device of FIG. 9, and the first varistor 740 may be added. The first varistor 740 may be connected to the output side of the bridge rectifier 620 to which the power of the power supply unit 610 is applied through the gate control unit 630. When the instantaneous voltage drop occurs, the first varistor 740 increases in resistance and blocks the power supply to the gate control unit 630 applied to the second power storage unit 720, Can be delayed from being opened.

Meanwhile, when the power of the gate control unit 630 is cut off, the operation of the second power storage unit 720 can be performed in the same manner as in FIG. Accordingly, it is possible to prevent the electromagnetic contactor 100 from being opened when instantaneous power failure and instantaneous voltage drop occur.

On the other hand, if the power supply voltage supplied from the power supply unit does not recover to a predetermined reference voltage or more after the occurrence of the instantaneous power failure and the instantaneous voltage drop, it is necessary to control so that the electromagnetic contactor is not charged. Accordingly, Figs. 13 to 15 may include a second varistor.

Here, the second varistor is provided on the line to which the control signal for turning on the input side switch is supplied, and the resistance value changes according to the external power source. If the external power source does not rise above the predetermined voltage, It is possible to prevent the input side switch from being turned on by the control signal.

&Lt; Eighth Embodiment to Tenth Embodiment > - Prevention of the input state when the voltage rises below the reference voltage &gt;

FIG. 13 is a view schematically showing a configuration of a driving device for preventing an input state at a voltage rising below a reference voltage according to an eighth embodiment of the present invention. 13, a second varistor 392 may be added to the configuration of FIG.

FIG. 14 is a view schematically showing a configuration of a driving device for preventing an input state when a voltage is lower than a reference voltage according to the ninth embodiment of the present invention. 14, a second varistor 495 may be added to the configuration of FIG.

FIG. 15 is a view schematically showing a configuration of a driving device for preventing an input state when a voltage is lower than a reference voltage according to a tenth embodiment of the present invention. In FIG. 15, at least one of the second varistor 750 and the third varistor 760 may be added to the configuration of FIG. Since the operations of the second varistor 750 and the third varistor 760 are the same, the operation of the second varistor 750 will be described.

13 to 15, the second varistors 392, 495, and 750 may be provided between the gate control units 330, 430 and 630 and the input switches 340, 450 and 750. The second varistor may be connected to the output side of the bridge rectifier through which the power of the power supply unit is applied through the gate control unit.

At this time, when the external power source of the second varistor is applied with a predetermined reference voltage or more, the resistance value is decreased and the power supplied from the gate control unit may be applied to the input side switch. That is, when an external power supply of less than a predetermined reference voltage is applied, the resistance value of the second varistor increases to cut off the power supplied from the gate control unit.

It will be apparent to those skilled in the relevant art that various modifications, additions and substitutions are possible, without departing from the spirit and scope of the invention as defined by the appended claims. The appended claims are to be considered as falling within the scope of the following claims.

10: Distribution board
20: Motor control panel
12, 22-1 to 22-3:
100: Magnetic contactor
1000b: Actuator
100, 200, 300, 400, 500, 600: Driving device
1140: input side coil 1150: open side coil
1250: Stator coil
340, 450, 550, 650, 660: input side switch
360, 460, 560, 670, 680: open side switch
350, 440, 540, 640:
380, 492, 592, 720:
390, 493, 593, 730: instantaneous power failure prevention switching section
391, 494, 740: first varistor
392, 495, 750: second varistor
760: third varistor

Claims (1)

A first power storage unit which is charged by an external power supply used for a charging operation;
An open side coil for performing an open operation using the electric charge charged in the first power storage unit;
An open-side transistor for interrupting charge flow to the open-side coil, the open-side transistor being turned on by the charge charged in the first power storage unit;
An instantaneous charge preventing switch connected in parallel with the open-side transistor to a line for supplying charge to the open-side transistor;
When an open event occurs, discharging is started by the charge voltage being cut off, and the instantaneous charge preventing switching unit is turned on for the predetermined discharge time by supplying charge to the instantaneous charge preventing switching unit during a predetermined discharge time A second power storage unit for delaying the open-side transistor being turned on by the charge stored in the first power storage unit;
A first varistor positioned between the line supplying the charging voltage and the second power storage unit; And
And a second varistor provided on a line to which a control signal for turning on the input side transistor is supplied and whose resistance value changes according to the external power source,
Wherein the first varistor prevents the charging voltage from being supplied to the second power storage unit by increasing the resistance value when the external power supply is below a predetermined voltage,
And the second varistor maintains a predetermined resistance value or higher when the external power supply does not rise above a predetermined voltage so as to prevent the input transistor from being turned on by the control signal. Magnetic contactor with built-in protection.

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