Control circuit and switch cabinet

Abstract

The utility model relates to a control circuit and a switch cabinet, the control circuit comprises a power supply access end, an opening branch, an opening coil and a resistor, and the two ends of the resistor are connected in parallel with the two ends of the opening coil; and the opening branch is connected with the power supply access end, the opening coil and the resistor and is used for enabling the power supply and the opening coil to form a first path and enabling the power supply and the resistor to form a second path under the condition of receiving the opening signal, so that the main contact of the contactor is disconnected and the switch cabinet is opened. By arranging the resistor in the control circuit and connecting the resistor with the opening coil in parallel, after the control circuit controls the switch cabinet to complete opening operation, the opening coil and the resistor can form a loop, current in the opening coil is effectively released, the safety of the control circuit is improved, the current in the opening coil can be limited, and the service life of the switch cabinet is prolonged. The current in the opening coil is prevented from being too large to damage the opening coil.

Description

Technical Field

[0001] The present disclosure relates to the field of circuit control technology, and in particular, to a control circuit and a switch cabinet. Background Art

[0002] Switch cabinets are generally used to make or break the connection between the upper and lower lines. When the control circuit of the switch cabinet receives the opening signal, it controls the switch cabinet to disconnect the connection between the upper and lower lines through the opening coil. However, after the switch cabinet performs the opening operation, there is current and electric energy in the opening coil, which may cause damage to the opening coil and is not conducive to improving the safety of the control circuit. Utility Model Content

[0003] In order to achieve the above objectives, the present disclosure provides a control circuit and a switch cabinet.

[0004] A first aspect of the present disclosure provides a control circuit applied to a switch cabinet, the switch cabinet comprising a contactor main contact, the control circuit comprising: a power supply access terminal, a switch branch, a switch coil and a resistor, the power supply access terminal being used to connect to a power supply;

[0005] Two ends of the resistor are connected in parallel with two ends of the opening coil;

[0006] The opening branch is connected to the power supply access terminal, the opening coil and the resistor, and is used to form a first path between the power supply and the opening coil, and a second path between the power supply and the resistor when a opening signal is received, so that the main contacts of the contactor are disconnected and the switch cabinet is opened.

[0007] Optionally, the control circuit further comprises: a closing branch and a closing coil;

[0008] The closing branch is connected to the power supply access terminal and the closing coil, and is used to form a third path between the power supply and the closing coil when a closing signal is received, so that the main contacts of the contactor are closed and the switch cabinet is closed.

[0009] Optionally, the power supply access terminal includes a first access terminal and a second access terminal;

[0010] The first end of the closing branch is connected to the first access end, the second end of the closing branch is connected to the second access end, and the third end of the closing branch is connected to the first end of the closing coil;

[0011] The second end of the closing coil is connected to the second access end;

[0012] The first end of the opening branch is connected to the first access end, and the second end of the opening branch is connected to the first end of the opening coil and the first end of the resistor;

[0013] The second end of the opening coil and the second end of the resistor are connected to the second access end.

[0014] Optionally, the opening branch includes: a first relay, the first relay including a first normally open contact;

[0015] The first end of the first normally open contact is connected to the first access end, and the second end of the first normally open contact is connected to the first end of the coil of the first relay;

[0016] The second end of the coil of the first relay is connected to the first end of the opening coil and the first end of the resistor;

[0017] The first relay is used for, when receiving the opening signal, energizing the coil of the first relay and closing the first normally open contact to make the opening branch conductive.

[0018] Optionally, the closing branch includes: a first branch and a second branch;

[0019] The first end of the first branch is connected to the first access end, the second end of the first branch is connected to the first end of the second branch, and the third end of the first branch is connected to the first end of the closing coil;

[0020] The second end of the second branch is connected to the second access end;

[0021] The gate-opening branch is used to control the conduction of the second branch when it is turned on;

[0022] The second branch is used to control the first branch to be disconnected when it is turned on, so as to disconnect the closing branch.

[0023] Optionally, the first relay includes a second normally open contact, and the second branch includes: a second relay;

[0024] A first end of the coil of the second relay is connected to a second end of the first branch, and a second end of the coil of the second relay is connected to a first end of the second normally open contact and a first end of the normally open contact of the second relay;

[0025] The second end of the second normally open contact and the second end of the normally open contact of the second relay are connected to the second access end.

[0026] Optionally, the first branch includes: a third relay;

[0027] A first end of the normally open contact of the third relay is connected to the first access end, and a second end of the normally open contact of the third relay is connected to a first end of the coil of the second relay and a first end of the normally closed contact of the second relay;

[0028] The second end of the normally closed contact of the second relay is connected to the first end of the coil of the third relay;

[0029] A second end of the coil of the third relay is connected to the second access end;

[0030] The second branch is used to, when conducting, energize the coil of the second relay and disconnect the normally closed contact of the second relay, so as to disconnect the first branch.

[0031] Optionally, the control circuit further includes a first switch component;

[0032] The first end of the first switch component is connected to the second end of the opening branch, and the second end of the first switch component is connected to the first end of the opening coil and the first end of the resistor.

[0033] Optionally, the control circuit further includes a second switch component;

[0034] The first end of the second switch component is connected to the third end of the closing branch, and the second end of the second switch component is connected to the first end of the closing coil.

[0035] A second aspect of the present disclosure provides a switch cabinet, wherein the switch cabinet comprises the control circuit described in any one of the first aspects of the present disclosure.

[0036] The above technical scheme, by setting a resistor in the control circuit and connecting the resistor in parallel with the opening coil, can form a loop between the opening coil and the resistor after the control circuit controls the switch cabinet to complete the opening operation, thereby effectively releasing the current in the opening coil, improving the safety of the control circuit, and limiting the current in the opening coil to avoid excessive current in the opening coil and damage to the opening coil.

[0037] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0039] Figure 1 is a schematic diagram of a control circuit according to an exemplary embodiment of the present disclosure;

[0040] Figure 2 According to this disclosure Figure 1 A schematic diagram of a control circuit shown in the illustrated embodiment;

[0041] Figure 3 According to this disclosure Figure 2 The illustrated embodiment shows a schematic diagram of a control circuit.

[0042] Description of Reference Numerals

[0043] 101 Opening branch 102 Closing branch

[0044] IN1 first signal interface IN2 second signal interface

[0045] TQ opening coil HQ closing coil

[0046] Q1 First switch component Q2 Second switch component

[0047] K1 working switch K2 test switch

[0048] TBJ first relay TBJV second relay

[0049] HBJ third relay R resistance DETAILED DESCRIPTION

[0050] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0051] Figure 1 is a schematic diagram of a control circuit according to an exemplary embodiment of the present disclosure, which is applied to a switch cabinet, and the switch cabinet includes a contactor main contact, such as Figure 1 As shown, the control circuit may include: a power access terminal, a tripping branch 101, a tripping coil TQ and a resistor R, wherein the power access terminal is used to connect a power supply; the two ends of the resistor R are connected in parallel with the two ends of the tripping coil TQ; the tripping branch 101 may be connected to the power access terminal, the tripping coil TQ and the resistor R, and is used to form a first path between the power supply and the tripping coil TQ, and a second path between the power supply and the resistor R, when a tripping signal is received, so that the main contacts of the contactor are disconnected and the switch cabinet is tripped.

[0052] The tripping signal may be a voltage signal, a current signal or a high level signal.

[0053] It should be noted that the control circuit may also include a first signal interface IN1, which may be used to receive a trip signal sent by a protection device or an external control system. The trip branch 101 may be turned on when the trip signal is received through the first signal interface IN1, so that the power supply may supply power to the trip coil TQ and the resistor R through the trip branch 101. When the trip coil TQ is energized, the main contacts of the contactor are disconnected and the switch cabinet is tripped. The protection device may be a relay protection device, a short-circuit protection device or a current protection device, and the external control system may be a PLC (Programmable Logic Controller), a DCS (Distributed Control System) or a SCADA (Supervisory Control and Data Acquisition). A resistor R is added to the control circuit, and both ends of the resistor R are connected in parallel with the two ends of the opening coil TQ. The power supply can simultaneously supply power to the opening coil TQ and the resistor R through the opening branch, thereby increasing the current in the opening branch 101, avoiding the problem of too small current in the opening branch 101, which causes the main contacts of the contactor to be unable to disconnect, thereby improving the reliability of the control circuit and helping to improve the safety of the switch cabinet.

[0054] By way of example, the power access terminal may include a positive access terminal and a negative access terminal, the first end of the opening branch 101 may be connected to the positive access terminal, the second end of the opening branch 101 may be connected to the first end of the opening coil TQ and the first end of the resistor R, the third end of the opening branch 101 may be connected to the first signal interface IN1, and receive the opening signal sent by the external control system through the first signal interface IN1, the second end of the opening coil TQ and the second end of the resistor R may be connected to the negative access terminal, and when the opening branch 101 receives the opening signal sent by the external control system through the first signal interface IN1, the power supply circuit may simultaneously supply power to the opening coil TQ and the resistor R through the positive access terminal and the opening branch 101, so that the main contacts of the contactor are disconnected, thereby achieving the purpose of opening the switch cabinet.

[0055] The above technical scheme, by setting a resistor in the control circuit and connecting the resistor in parallel with the opening coil, can form a loop between the opening coil and the resistor after the control circuit controls the switch cabinet to complete the opening operation, thereby effectively releasing the current in the opening coil, improving the safety of the control circuit, and limiting the current in the opening coil to avoid excessive current in the opening coil and damage to the opening coil.

[0056] Figure 2 According to this disclosure Figure 1 The embodiment shown is a schematic diagram of a control circuit, such as Figure 2 As shown, the control circuit may further include: a closing branch 102 and a closing coil HQ; the closing branch 102 may be connected to the power access terminal and the closing coil HQ, and is used to enable the power supply and the closing coil HQ to form a third path when a closing signal is received, so that the main contacts of the contactor are closed and the switch cabinet is closed.

[0057] The closing signal may be a voltage signal, a current signal or a high level signal.

[0058] It should be noted that the control circuit may also include a second signal interface IN2, which may be used to receive a closing signal sent by an external control system. The closing branch 102 may be turned on when the closing signal is received through the second signal interface IN2, so that the power supply supplies power to the closing coil HQ, and when the closing coil HQ is energized, the main contacts of the contactor are closed and the switch cabinet is closed. The closing branch 102 may also be disconnected when it is determined that the opening branch 101 receives an opening signal sent by an external control system, so that the third path formed by the power supply and the closing coil HQ is disconnected, so as to avoid the main contacts of the contactor being unable to be disconnected when the closing coil HQ is energized, thereby improving the reliability of the control circuit.

[0059] By way of example, the power access terminal may include a positive access terminal and a negative access terminal, the first end of the closing branch 102 may be connected to the positive access terminal, the second end of the closing branch 102 may be connected to the negative access terminal, the third end of the closing branch 102 may be connected to the first end of the closing coil HQ, the second end of the closing coil HQ may be connected to the negative access terminal, and the closing coil HQ may be turned on when a closing signal sent by an external control system is received through the second signal interface IN2, so that the power supply may supply power to the closing coil HQ through the positive access terminal and the closing branch 102, so that the main contacts of the contactor are closed and the switch cabinet is closed.

[0060] The above technical scheme, by setting a resistor in the control circuit and connecting the resistor in parallel with the opening coil, can form a loop between the opening coil and the resistor after the control circuit controls the switch cabinet to complete the opening operation, thereby effectively releasing the current in the opening coil, improving the safety of the control circuit, and limiting the current in the opening coil to avoid excessive current in the opening coil and damage to the opening coil.

[0061] Figure 3 According to this disclosure Figure 2 The embodiment shown is a schematic diagram of a control circuit, such as Figure 3As shown, the power access terminal may include a first access terminal and a second access terminal; the first end of the closing branch 102 may be connected to the first access terminal, the second end of the closing branch 102 may be connected to the second access terminal, and the third end of the closing branch 102 may be connected to the first end of the closing coil HQ; the second end of the closing coil HQ may be connected to the second access terminal; the first end of the opening branch 101 may be connected to the first access terminal, the second end of the opening branch 101 may be connected to the first end of the opening coil TQ and the first end of the resistor R; the second end of the opening coil TQ and the second end of the resistor R may be connected to the second access terminal.

[0062] The first access terminal may be a positive access terminal, and the second access terminal may be a negative access terminal.

[0063] It should be noted that the closing branch 102 can be turned on when receiving a closing signal through the second signal interface IN2, and the power supply supplies power to the closing coil HQ. The closing coil HQ can close the main contacts of the contactor when it is energized, so that the switch cabinet can achieve a closing operation. The opening branch 101 can be closed when receiving an opening signal, forming a first path between the power supply and the opening coil TQ, and a second path between the power supply and the resistor R. At the same time, the closing branch 102 can be disconnected when it is determined that the opening branch 101 receives an opening signal, so that the power supply stops supplying power to the closing coil HQ. When the closing coil HQ loses power and the opening coil TQ is energized, the main contacts of the contactor are disconnected, and the switch cabinet is opened.

[0064] Optionally, Figure 3 For example, the opening branch 101 may include: a first relay TBJ, the first relay TBJ including a first normally open contact; the first end of the first normally open contact can be connected to the first access end, and the second end of the first normally open contact can be connected to the first end of the coil of the first relay TBJ; the second end of the coil of the first relay TBJ can be connected to the first end of the opening coil TQ and the first end of the resistor R; the first relay TBJ can be used to energize the coil of the first relay TBJ and close the first normally open contact to make the opening branch 101 conductive when the opening signal is received.

[0065] The control circuit may further include a first switch component Q1; the first end of the first switch component Q1 may be connected to the second end of the opening branch 101, and the second end of the first switch component Q1 may be connected to the first end of the opening coil TQ and the first end of the resistor R. The first switch component Q1 may be an IGBT (Insulated Gate Bipolar Transistor), a BJT (Bipolar Junction Transistors), a MOS (Metal-Oxide-Semiconductor Field-Effect Transistor) tube or an auxiliary contact of a circuit breaker. When the switch cabinet receives the opening signal, it analyzes the device or system that sends the opening signal, and when it is determined that the device is a protection device or the system is an external control system, it controls the first opening component to close, and forwards the opening signal to the opening branch 101 to open the switch cabinet.

[0066] It should be noted that the first end of the coil of the first relay TBJ can also be connected to the first signal interface IN1. When the first relay TBJ receives a trip signal through the first signal interface IN1, the coil of the first relay TBJ is energized, the first normally open contact is closed, the power supply supplies power to the trip coil TQ and the resistor R through the first access end and the first relay TBJ, the main contacts of the contactor are closed, and the switch cabinet is tripped.

[0067] Optionally, Figure 3 For example, the closing branch 102 may include: a first branch 1021 and a second branch 1022; the first end of the first branch may be connected to the first access end, the second end of the first branch may be connected to the first end of the second branch, and the third end of the first branch may be connected to the first end of the closing coil HQ; the second end of the second branch may be connected to the second access end; the opening branch 101 may be used to control the second branch to be turned on when it is turned on; the second branch may be used to control the first branch to be turned off when it is turned on, so as to disconnect the closing branch 102.

[0068] Among them, the first relay TBJ may include a second normally open contact, and the second branch may include: a second relay TBJV; the first end of the coil of the second relay TBJV can be connected to the second end of the first branch, and the second end of the coil of the second relay TBJV can be connected to the first end of the second normally open contact and the first end of the normally open contact of the second relay TBJV; the second end of the second normally open contact and the second end of the normally open contact of the second relay TBJV can be connected to the second access end. The first branch may include: a third relay HBJ; the first end of the normally open contact of the third relay HBJ may be connected to the first access end, the second end of the normally open contact of the third relay HBJ may be connected to the first end of the coil of the second relay TBJV and the first end of the normally closed contact of the second relay TBJV; the second end of the normally closed contact of the second relay TBJV may be connected to the first end of the coil of the third relay HBJ; the second end of the coil of the third relay HBJ may be connected to the second access end; the second branch may be used to energize the coil of the second relay TBJV and disconnect the normally closed contact of the second relay TBJV when it is turned on, so that the first branch is disconnected. The control circuit may also include a second switch component Q2; the first end of the second switch component Q2 may be connected to the third end of the closing branch 102, and the second end of the second switch component Q2 may be connected to the first end of the closing coil HQ. The second switch component Q2 may be an auxiliary contact of an IGBT, a BJT, a MOS tube or a circuit breaker. When the switch cabinet receives the closing signal, it analyzes the system that sends the closing signal, and when it determines that the system is an external control system, it controls the first opening component to close, and forwards the closing signal to the closing branch 102 to close the switch cabinet. The control circuit also includes a working switch K1 and a test switch K2, the two ends of the test switch K2 can be connected in parallel with the two ends of the working switch K1, the first end of the working switch K1 can be connected to the second end of the second switch component Q2, and the second end of the working switch K1 can be connected to the first end of the closing coil HQ. When the switch cabinet is in the working state, the working switch K1 is closed, and when the switch cabinet is in the test state, the test switch K2 is closed.

[0069] It should be noted that the first end of the coil of the first relay TBJ can be connected to the first end of the first normally open contact of the first relay TBJ and the first signal interface IN1, the first end of the second normally open contact of the first relay TBJ can be connected to the second end of the coil of the second relay TBJV, the first end of the coil of the second relay TBJV can be connected to the second end of the normally open contact of the third relay HBJ, the first end of the normally closed contact of the second relay TBJV can be connected to the second end of the normally open contact of the third relay HBJ, and the second end of the normally closed contact of the second relay TBJV can be connected to The coil of the third relay HBJ is connected. When the switch cabinet receives the opening signal, it forwards the opening signal to the first signal interface IN1, the coil of the first relay TBJ is energized, the first normally open contact and the second normally open contact are closed, the power supply supplies power to the coil of the first relay TBJ and the coil of the second relay TBJV, the normally closed contact of the second relay TBJV is disconnected, the coil of the third relay HBJ is de-energized, the normally open contact of the third relay HBJ is disconnected, the opening branch 101 is closed, the closing branch 102 is disconnected, the opening coil TQ is energized, the closing coil HQ is de-energized, and the switch cabinet is opened. The first end of the normally closed contact of the second relay TBJV can also be connected to the second signal interface IN2. When the switch cabinet receives the closing signal, it forwards the closing signal to the second signal interface IN2, the coil of the third relay HBJ is energized, the normally open contact of the third relay HBJ is closed, the power supply supplies power to the coil of the third relay HBJ, the closing branch 102 is closed, the closing coil HQ is energized, and the switch cabinet is closed.

[0070] The above technical scheme, by setting a resistor in the control circuit, the resistor is connected in parallel with the opening coil, thereby reducing the total resistance in the control circuit and increasing the current of the opening branch in the control circuit. The opening branch can effectively control the disconnection of the closing branch, so that the control circuit can effectively control the opening of the switch cabinet, thereby improving the reliability of the control circuit and being beneficial to improving the safety of the switch cabinet.

[0071] An exemplary embodiment of the present disclosure provides a switch cabinet, which includes the above Figure 1-Figure 3 A control circuit as described in any one of the preceding claims.

[0072] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0073] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0074] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A control circuit, characterized in that: Applied to a switch cabinet, the switch cabinet includes a contactor main contact, the control circuit includes: a power supply access terminal, a switch branch, a switch coil and a resistor, and the power supply access terminal is used to connect a power supply; Two ends of the resistor are connected in parallel with two ends of the opening coil; The opening branch is connected to the power supply access terminal, the opening coil and the resistor, and is used to form a first path between the power supply and the opening coil, and a second path between the power supply and the resistor when a opening signal is received, so that the main contacts of the contactor are disconnected and the switch cabinet is opened.

2. The control circuit according to claim 1, characterized in that: The control circuit also includes: a closing branch and a closing coil; The closing branch is connected to the power supply access terminal and the closing coil, and is used to form a third path between the power supply and the closing coil when a closing signal is received, so that the main contacts of the contactor are closed and the switch cabinet is closed.

3. The control circuit according to claim 2, characterized in that: The power supply access terminal includes a first access terminal and a second access terminal; The first end of the closing branch is connected to the first access end, the second end of the closing branch is connected to the second access end, and the third end of the closing branch is connected to the first end of the closing coil; The second end of the closing coil is connected to the second access end; The first end of the opening branch is connected to the first access end, and the second end of the opening branch is connected to the first end of the opening coil and the first end of the resistor; The second end of the opening coil and the second end of the resistor are connected to the second access end.

4. The control circuit according to claim 3, characterized in that: The opening branch comprises: a first relay, wherein the first relay comprises a first normally open contact; The first end of the first normally open contact is connected to the first access end, and the second end of the first normally open contact is connected to the first end of the coil of the first relay; The second end of the coil of the first relay is connected to the first end of the opening coil and the first end of the resistor; The first relay is used for, when receiving the opening signal, energizing the coil of the first relay and closing the first normally open contact to make the opening branch conductive.

5. The control circuit according to claim 3, characterized in that: The closing branch includes: a first branch and a second branch; The first end of the first branch is connected to the first access end, the second end of the first branch is connected to the first end of the second branch, and the third end of the first branch is connected to the first end of the closing coil; The second end of the second branch is connected to the second access end; The gate-opening branch is used to control the conduction of the second branch when it is turned on; The second branch is used to control the first branch to be disconnected when it is turned on, so as to disconnect the closing branch.

6. The control circuit according to claim 5, characterized in that: The first relay includes a second normally open contact, and the second branch includes: a second relay; A first end of the coil of the second relay is connected to a second end of the first branch, and a second end of the coil of the second relay is connected to a first end of the second normally open contact and a first end of the normally open contact of the second relay; The second end of the second normally open contact and the second end of the normally open contact of the second relay are connected to the second access end.

7. The control circuit according to claim 6, characterized in that: The first branch includes: a third relay; A first end of the normally open contact of the third relay is connected to the first access end, and a second end of the normally open contact of the third relay is connected to a first end of the coil of the second relay and a first end of the normally closed contact of the second relay; The second end of the normally closed contact of the second relay is connected to the first end of the coil of the third relay; A second end of the coil of the third relay is connected to the second access end; The second branch is used to, when conducting, energize the coil of the second relay and disconnect the normally closed contact of the second relay, so as to disconnect the first branch.

8. The control circuit according to claim 3, characterized in that: The control circuit also includes a first switch component; The first end of the first switch component is connected to the second end of the opening branch, and the second end of the first switch component is connected to the first end of the opening coil and the first end of the resistor.

9. The control circuit according to claim 3, characterized in that: The control circuit also includes a second switch component; The first end of the second switch component is connected to the third end of the closing branch, and the second end of the second switch component is connected to the first end of the closing coil.

10. A switch cabinet, characterized in that: The switch cabinet comprises the control circuit according to any one of claims 1 to 9 above.

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