Control circuit of permanent magnet operating mechanism

Abstract

The utility model discloses a control circuit of a permanent magnet operating mechanism. The device comprises a closing loop, a closing loop control circuit, an opening loop and an opening loop control circuit, the closing loop control circuit comprises a closing button QA and a closing relay KM1, the opening loop control circuit comprises an opening button TA and an opening relay KM2, the closing loop and the opening loop are both connected with a coil Q in an electromagnet, and the closing relay KM1 is connected with the opening button TA. The closing loop is provided with a bridge rectifier UR1, a normally open pole KM1-1 of the closing relay KM1 is connected with the bridge rectifier UR1, and a direct current power supply can be provided for the coil Q by the bridge rectifier UR1, the opening loop is provided with a bridge rectifier UR2, a normally open pole KM2-1 of the opening relay KM2 is connected with the bridge rectifier UR2, and a direct current power supply can be provided for the coil Q by the bridge rectifier UR2. The utility model has the advantages that the control circuit is simple, the control is reliable, the stable voltage of the switching-on and switching-off circuit can be effectively ensured, the interlocking of the switching-on and switching-off control circuit can be realized, and the use reliability is further ensured.

Description

Technical Field

[0001] This utility model relates to an operation control circuit for controlling the opening and closing of circuit breakers or contactors, specifically a permanent magnet operating mechanism control circuit. Background Technology

[0002] For the opening and closing operations of circuit breakers or contactors, a dedicated operating mechanism is usually required. Existing conventional operating mechanisms are usually complex in structure and control circuit, and have poor control reliability. In particular, when the closing position needs to be held, it cannot be held effectively. In addition, there are some simple electromagnetic holding circuit designs that can achieve the closing holding effect, but these mechanisms usually need to be energized for a long time, so they have high energy consumption and short service life. Summary of the Invention

[0003] The technical problem to be solved by this utility model is to provide a permanent magnet operating mechanism control circuit with a simple circuit structure design, reliable control, and the ability to achieve interlocking of the closing and opening control circuits and effectively ensure the voltage stability of the closing and opening circuits.

[0004] To solve the above-mentioned technical problems, the permanent magnet operating mechanism control circuit of this utility model includes a closing circuit, a closing circuit control circuit for controlling the closing circuit, a opening circuit, and an opening circuit control circuit for controlling the opening circuit. The closing circuit control circuit includes a closing button QA and a closing relay KM1 controlled by the closing button QA. The opening circuit control circuit includes an opening button TA and an opening relay KM2 controlled by the opening button TA. Both the closing circuit and the opening circuit are connected to a coil Q in an electromagnet. The closing circuit has a rectifier bridge UR1, and the closing relay KM2... The normally open pole KM1-1 of the circuit breaker is connected to the rectifier bridge UR1 and can energize the rectifier bridge UR by closing the normally open pole KM1-1, thereby providing DC power to the coil Q from the rectifier bridge UR1. The circuit breaker circuit has a rectifier bridge UR2. The normally open pole KM2-1 of the circuit breaker relay KM2 is connected to the rectifier bridge UR2 and can energize the rectifier bridge UR2 by closing the normally open pole KM2-1, thereby providing DC power to the coil Q from the rectifier bridge UR2. The electromagnet cooperates with a permanent magnet and can generate an attractive or repulsive force on the permanent magnet by changing the direction of the current in the coil Q, thereby realizing the opening and closing operation.

[0005] The permanent magnet is placed in an armature with a push arm. The armature can drive the push arm to move up and down by the electromagnetic force generated by the electromagnet, and then contact the closing position switch SHQ with normally closed nodes SQH-1 and SQH-2 or the opening position switch SQF with normally closed nodes SQF-1 and SQF-2.

[0006] The normally closed node SQH-1 is connected in series in the closing circuit, the normally closed node SQH-2 is connected in series in the closing circuit control circuit, the normally closed node SQF-1 is connected in series in the opening circuit, and the normally closed node SQF-2 is connected in series in the opening circuit control circuit.

[0007] The rectifier bridge UR1 and rectifier bridge UR2 are connected in parallel with filter capacitors C1 and C2.

[0008] Arc-extinguishing capacitors C3 and C4 are connected in parallel across the two ends of the contacts of SQF-1 and SQH-1.

[0009] The closing control circuit has a normally closed node KM2-2 connected in series, and the opening circuit has a normally closed node KM1-2 connected in series.

[0010] The advantages of this utility model are:

[0011] By using an electromagnet in conjunction with a permanent magnet and cleverly utilizing the closing and opening circuits connected to a coil Q in the electromagnet, the operating mechanism can generate an attractive or repulsive force on the permanent magnet by changing the direction of the current in coil Q, thereby achieving the closing and opening operation. Especially when the closing circuit and closing control circuit are cut off, the push arm can continue to move under the action of inertia and the attraction of the permanent magnet on the yoke until stable contact is achieved. After that, the operating mechanism completes the closing and opening operation and maintains the closing and opening state. Its control circuit is simple, reliable, and can effectively ensure the voltage stability of the closing and opening circuits. In addition, by inserting normally closed node KM2-2 in series in the closing control circuit and normally closed node KM1-2 in series in the opening circuit, the closing and opening control circuits can be interlocked to prevent the bridge rectifiers UR1 and UR2 from being energized simultaneously due to a fault, further ensuring the reliability of use. Attached Figure Description

[0012] Figure 1 This is a circuit diagram of the control circuit for the permanent magnet operating mechanism of this utility model;

[0013] Figure 2 This is a schematic diagram of the permanent magnet operating mechanism in this utility model. Detailed Implementation

[0014] The control circuit of the permanent magnet operating mechanism of this utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0015] As shown in the figure, the control circuit of the permanent magnet operating mechanism of this utility model is mainly used in applications such as... Figure 2 In the single-coil permanent magnet operating mechanism, the single-coil permanent magnet operating mechanism mainly uses the cooperation of permanent magnet and electromagnet to change the polarity of electromagnet by changing the direction of current in electromagnet coil, thereby enabling the operating mechanism to close or open the circuit. As shown in the figure, the single-coil permanent magnet operating mechanism includes an armature 2 set in the base 1, a permanent magnet 3 embedded in the armature, a push rod 4 connected to the permanent magnet and used to push the armature to move vertically up and down, an upper magnetic yoke 5 and a lower magnetic yoke 6 located above and below the armature 2, and an electromagnet formed by setting a coil Q on the upper part of the upper magnetic yoke. Of course, a closing position switch 7 and an opening position switch 8 are set on the side of the base 1, and a push arm 9 connected to the armature 2 can reciprocate between the closing position switch 7 and the opening position switch 8.

[0016] Based on the aforementioned single-coil permanent magnet operating mechanism, the control circuit of this utility model includes a closing circuit, a closing circuit control circuit for controlling the closing circuit, a opening circuit, and an opening circuit control circuit for controlling the opening circuit. The closing circuit control circuit includes a closing button QA and a closing relay KM1 controlled by the closing button QA. The opening circuit control circuit includes a opening button TA and an opening relay KM2 controlled by the opening button TA. Both the closing circuit and the opening circuit are connected to the coil Q in the electromagnet. The closing circuit has a rectifier bridge UR1. The normally open pole KM1-1 of the closing relay KM1 is connected to the rectifier bridge UR1 and can energize the rectifier bridge UR1 by closing the normally open pole KM1-1, thereby providing DC power to the coil Q from the rectifier bridge UR1. The opening circuit has a rectifier bridge UR2. The normally open pole KM2-1 of the opening relay KM2 is connected to the rectifier bridge UR1. 1 is connected to the rectifier bridge UR2 and can be energized by closing the normally open pole KM2-1, and then the rectifier bridge UR2 provides DC power to the coil Q. The closing position switch SHQ (7) has normally closed nodes SQH-1 and SQH-2, and the opening position switch SQF (8) has normally closed nodes SQF-1 and SQF-2. The normally closed node SQH-1 is connected in series in the closing circuit, the normally closed node SQH-2 is connected in series in the closing circuit control circuit, the normally closed node SQF-1 is connected in series in the opening circuit, and the normally closed node SQF-2 is connected in series in the opening circuit control circuit. The electromagnet cooperates with the permanent magnet and can generate attraction or repulsion force on the permanent magnet by changing the direction of the current in the coil Q. The armature can drive the push arm to move up and down by the electromagnetic force generated by the electromagnet, and then contact the closing position switch SHQ or the opening position switch SQF, thereby realizing the opening and closing operation.

[0017] Furthermore, to ensure voltage stability in the closing and opening circuits, filter capacitors C1 and C2 are connected in parallel at rectifier bridge UR1 and rectifier bridge UR2. To prevent the SQF-1 and SQH-1 contacts from burning out during switching, arc-extinguishing capacitors C3 and C4 are connected in parallel across their contacts to prevent burnout due to arcing. A normally closed node KM2-2 is connected in series in the closing control circuit, and a normally closed node KM1-2 is connected in series in the opening circuit. The purpose is to achieve interlocking of the closing and opening control circuits and prevent bridge rectifier UR1 and rectifier bridge UR2 from being energized simultaneously due to a fault.

[0018] Its working principle is as follows:

[0019] The single-coil permanent magnet mechanism utilizes the property that opposite poles attract and like poles repel each other. By changing the direction of the current in the coil, the direction of the electromagnet's magnetic poles is changed, thereby realizing the opening and closing of the permanent magnet mechanism.

[0020] The circuit state of a single-coil permanent magnet operating mechanism when it is in the open state is as follows: Figure 1 As shown, at this time, the normally closed nodes SQH-1 and SQH-2 in the closing position switch SHQ are in the closed state, while the normally closed nodes SQF-1 and SQF-2 in the opening position switch SQF are in the open state because the opening position switch is pushed.

[0021] When the closing button QA is pressed, the closing relay KM1 is energized, and its normally open pole KM1-1 closes. The rectifier bridge UR1 is energized, and UR1 provides DC power to the coil Q. The current in the coil flows from point A to point B. At this time, the magnetic poles of the coil and the adjacent surfaces of the permanent magnet are opposite, and the magnetic force manifests as an attraction. Because the electromagnetic attraction is greater than the attraction of the permanent magnet to the lower yoke, the permanent magnet drives the push rod to move upward. When the armature leaves the lower yoke, the normally closed contacts SQF-1 and SQF-2 of the trip position switch SQF return to the closed state, preparing for the next trip. When the armature approaches the upper yoke, the position switch push arm pushes the closing position switch SHQ, and the normally closed contacts SQH-1 and SQH-2 are pushed open. The closing circuit and the closing control circuit are cut off, the coil is de-energized, and the electromagnetic force disappears. At this time, the push rod continues to move upward under the action of inertia and the attraction of the permanent magnet on the upper yoke. When the upper cover plate on the permanent magnet is in complete contact with the upper yoke, the operating mechanism completes the closing and maintains the closed state.

[0022] When the trip button TA is pressed, the trip relay KM2 is energized, and its normally open pole KM2-1 closes. The rectifier bridge UR2 is energized, and UR2 provides DC power to coil Q. Current flows from point B to point A in the coil. At this time, the magnetic poles of the coil and the adjacent surfaces of the permanent magnet are the same, and the magnetic force exhibits repulsion. Because the electromagnetic repulsion is greater than the attraction of the permanent magnet to the upper yoke, the permanent magnet drives the push rod downwards. After the armature leaves the upper yoke, the normally closed contacts SQH-1 and SQH-2 in the closing position switch SHQ return to the closed state, preparing for the next closing operation. When the armature approaches the lower yoke, the position switch push arm pushes the trip position switch SQF, and the normally closed contacts SQF-1 and SQF-2 are pushed open. The trip circuit and the trip control circuit are cut off, the coil is de-energized, and the electromagnetic force disappears. At this time, the push rod continues to move downward under the action of inertia and the attraction of the permanent magnet on the lower yoke. When the lower cover plate on the permanent magnet is in complete contact with the lower yoke, the operating mechanism completes the trip and maintains the trip state.

[0023] Of course, the above description is not intended to limit the present utility model, and the present utility model is not limited to the examples given above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present utility model should also fall within the protection scope of the present utility model.

Claims

1. A control circuit for a permanent magnet operating mechanism, characterized in that: The circuit includes a closing circuit, a closing circuit control circuit for controlling the closing circuit, a opening circuit, and an opening circuit control circuit for controlling the opening circuit. The closing circuit control circuit includes a closing button QA and a closing relay KM1 controlled by the closing button QA. The opening circuit control circuit includes an opening button TA and an opening relay KM2 controlled by the opening button TA. Both the closing and opening circuits are connected to a coil Q in an electromagnet. The closing circuit has a rectifier bridge UR1. The normally open pole KM1-1 of the closing relay KM1 is connected to the rectifier bridge. The rectifier bridge UR1 is connected and can be energized by closing its normally open pole KM1-1, thereby providing DC power to the coil Q. The tripping circuit has a rectifier bridge UR2. The normally open pole KM2-1 of the tripping relay KM2 is connected to the rectifier bridge UR2 and can be energized by closing its normally open pole KM2-1, thereby providing DC power to the coil Q. The electromagnet cooperates with a permanent magnet and can generate an attractive or repulsive force on the permanent magnet by changing the direction of the current in the coil Q, thereby realizing the tripping and closing operation.

2. The control circuit for the permanent magnet operating mechanism according to claim 1, characterized in that: The permanent magnet is placed in an armature with a push arm. The armature can drive the push arm to move up and down by the electromagnetic force generated by the electromagnet, and then contact the closing position switch SHQ with normally closed nodes SQH-1 and SQH-2 or the opening position switch SQF with normally closed nodes SQF-1 and SQF-2.

3. The control circuit for the permanent magnet operating mechanism according to claim 2, characterized in that: The normally closed node SQH-1 is connected in series in the closing circuit, the normally closed node SQH-2 is connected in series in the closing circuit control circuit, the normally closed node SQF-1 is connected in series in the opening circuit, and the normally closed node SQF-2 is connected in series in the opening circuit control circuit.

4. The control circuit for the permanent magnet operating mechanism according to claim 1, 2 or 3, characterized in that: The rectifier bridge UR1 and rectifier bridge UR2 are connected in parallel with filter capacitors C1 and C2.

5. The control circuit for the permanent magnet operating mechanism according to claim 4, characterized in that: Arc-extinguishing capacitors C3 and C4 are connected in parallel across the two ends of the contacts of SQF-1 and SQH-1.

6. The control circuit for the permanent magnet operating mechanism according to claim 5, characterized in that: The closing control circuit has a normally closed node KM2-2 connected in series, and the opening circuit has a normally closed node KM1-2 connected in series.

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