Positive and negative rotation AC motor control switching circuit

Abstract

The utility model discloses a positive and negative rotation AC motor control switching circuit, comprising a control power taking circuit which is connected with a motor power supply line to take power and then supplies power to a switching circuit, and the switching circuit is used for switching a motor to a local or remote control short-circuit line circuit. The zero line circuit is used for forming a zero line point when the motor is switched to local control, and the state indicating circuit is used for indicating the state of the motor. Local / remote control switching of the positive and negative rotation alternating current motor is realized under the condition that no extra power supply is needed.

Description

Technical Field

[0001] The utility model belongs to the technical field of AC motors, and in particular relates to a forward and reverse AC motor control switching circuit. Background Art

[0002] Forward and reversing AC motors are widely used in products such as valves, fans and roller shutters. Existing forward and reversing AC motors are mostly used in application scenarios where it is inconvenient to control the equipment locally, resulting in the equipment only being able to be controlled remotely, causing much inconvenience to on-site construction, equipment commissioning and technical after-sales service. Some local / remote control switching is achieved by relying on the valve control box, but the valve control box requires additional power from an external power supply. However, forward and reversing AC motors are mostly used in places such as exterior walls, rooftops and warehouses, and this type of method has greater limitations.

[0003] Therefore, how to realize the local / remote control switching of the forward and reverse AC motor without the need for additional power supply is a technical problem to be solved by those skilled in the art. Utility Model Content

[0004] The purpose of the utility model is to solve the technical problem that the local / remote control switching of the forward and reverse AC motor in the prior art requires additional power supply. To this end, the utility model provides a forward and reverse AC motor control switching circuit, which includes:

[0005] The control power supply circuit is connected to the motor power supply line to supply power to the switching circuit. The switching circuit is used to switch the motor to local or remote control. The short-circuit circuit is used to form a neutral point when the motor is switched to local control so that the motor can work normally. The status indication circuit is used to indicate the motor status.

[0006] Furthermore, the control power supply circuit includes an AC / DC converter, port 1 of the AC / DC converter is connected to port 1 of the terminal socket in the switching circuit, port 2 of the AC / DC converter is connected to port 1 of the terminal socket at the motor, port 1 of the terminal socket at the motor is also connected to port 2 of the external power supply terminal socket, and port 3 and port 4 of the AC / DC converter are respectively connected to the switching circuit and the short-circuit circuit.

[0007] Further, the switching circuit specifically includes: port 2 of the wiring socket in the switching circuit is connected to one end of the local / remote switching switch, the other end of the local / remote switching switch is connected to port 4 of the wiring socket in the switching circuit, port 3 of the wiring socket in the switching circuit is connected to one end of the first relay coil and is also connected to the short-circuit circuit, port 5 of the wiring socket in the switching circuit is connected to port 4 of the AC / DC converter, port 6 of the wiring socket in the switching circuit is connected to the second end of the forward and reverse switch, the third end of the forward and reverse switch is connected to port 8 of the wiring socket in the switching circuit, the first end of the forward and reverse switch is connected to port 10 of the wiring socket in the switching circuit, port 7 of the wiring socket in the switching circuit is connected to the first normally closed contact in the first relay, port 9 of the wiring socket in the switching circuit is connected to the second normally closed contact in the first relay, the first normally open contact and the second normally open contact in the first relay are both connected to the external power supply wiring socket, and the first input contact and the second input contact in the first relay are both connected to the wiring socket at the motor.

[0008] Furthermore, the short-circuit circuit specifically includes: a first diode, a second diode and a second relay, wherein the positive electrodes of the first diode and the second diode are connected to port 4 of the AC / DC converter, the first input contact and the second input contact of the second relay, one end of the second relay coil is connected to port 3 of the AC / DC converter, and the other end of the second relay coil is connected to port 3 of the terminal block in the switching circuit, the cathode of the first diode is respectively connected to the first normally open contact in the first relay and the first normally closed contact in the second relay, and the cathode of the second diode is respectively connected to the second normally open contact in the first relay and the second normally closed contact in the second relay.

[0009] Further, the status indication circuit specifically includes: a third relay and a fourth relay, the first input contact of the third relay is connected to the port 3 of the indicator light socket, one end of the third relay coil is connected to the socket at the motor, one end of the fourth relay coil is connected to the socket at the motor, the other end of the third relay coil, the other end of the fourth relay coil, the first normally open contact of the third relay and the first normally open contact of the fourth relay are all connected to the port 3 of the AC / DC converter, the second normally open contact of the third relay is connected to the external power supply socket, the second normally open contact of the fourth relay is connected to the external power supply socket, the port 1 of the indicator light socket is connected to the socket at the motor, the port 5 of the indicator light socket is connected to the first input contact of the fourth relay, the second input contact of the third relay and the input contact of the fourth relay are both connected to the external power supply socket, the port 2 of the indicator light socket is respectively connected to one end of the third diode and one end of the fourth diode, the port 4 of the indicator light socket is connected to the other end of the third diode, and the port 6 of the indicator light socket is connected to the other end of the fourth diode.

[0010] Further, port 1 of the wiring socket at the motor is connected to port 2 of the AC / DC converter, port 3 of the wiring socket at the motor is connected to the first input contact of the first relay, port 5 of the wiring socket at the motor is connected to the second input contact of the first relay, port 7 of the wiring socket at the motor is connected to port 1 of the AC / DC converter, port 9 of the wiring socket at the motor is connected to one end of the third relay coil, port 11 of the wiring socket at the motor is connected to one end of the fourth relay coil, port 2, port 4 and port 6 of the wiring socket at the motor are all connected to the motor, port 8 of the wiring socket at the motor is connected to the input contact of the manual switch, port 10 of the wiring socket at the motor is connected to the first contact of the manual switch, and port 12 of the wiring socket at the motor is connected to the third contact of the manual switch.

[0011] Compared with the prior art, the beneficial effects of the utility model are:

[0012] The utility model provides a forward and reverse AC motor control switching circuit. Compared with the prior art, the circuit includes a control power supply circuit, which is connected to the motor power supply line to supply power to the switching circuit, the switching circuit is used to switch the motor to local or remote control, the short-circuit circuit is used to form a zero point when the motor is switched to local control, and the state indication circuit is used to indicate the motor state. The local / remote control switching of the forward and reverse AC motor is realized without the need for additional power supply. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of this specification, the drawings required for use in the embodiments will be briefly introduced below. The drawings described below are only some embodiments recorded in this specification. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0014] Figure 1 Shown is a schematic diagram of the structure of the forward and reverse AC motor control switching circuit provided in the embodiment of this specification. DETAILED DESCRIPTION

[0015] In order to enable those skilled in the art to better understand the technical solutions in this specification, the technical solutions in the embodiments of this specification will be clearly and completely described below in conjunction with the drawings in the embodiments of this specification. Obviously, the described embodiments are only part of the embodiments of this specification, not all of the embodiments. Based on the embodiments in this specification, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of this specification.

[0016] like Figure 1 The structure diagram of the forward and reverse AC motor control switching circuit provided in the embodiment of this specification is shown. Although this specification provides the structure shown in the following embodiment or the accompanying drawings, the structure may include more or fewer structures after partial merging based on routine or without creative labor, and these structures are not limited to the structures shown in the embodiments of this specification or the accompanying drawings. When the structure is applied in an actual device or terminal product, it can be executed sequentially or in parallel according to the embodiment or module structure.

[0017] The forward and reverse AC motor control switching circuit provided in the embodiment of this specification includes:

[0018] The control power supply circuit is connected to the motor power supply line to supply power to the switching circuit. The switching circuit is used to switch the motor to local or remote control. The short-circuit circuit is used to form a neutral point when the motor is switched to local control so that the motor can work normally. The status indication circuit is used to indicate the motor status.

[0019] Among them, the control power supply circuit includes an AC / DC converter, port 1 of the AC / DC converter is connected to port 1 of the terminal socket in the switching circuit, port 2 of the AC / DC converter is connected to port 1 of the terminal socket at the motor, port 1 of the terminal socket at the motor is also connected to port 2 of the external power supply terminal socket, and port 3 and port 4 of the AC / DC converter are respectively connected to the switching circuit and the short-circuit circuit.

[0020] Specifically, power is taken from the control circuit of the motor and then converted to obtain a stable DC power supply to power the subsequent control circuit and status feedback circuit.

[0021] When the motor is remotely controlled, there is always one point between the motor forward control point and the motor reverse control point that is connected to the 220VAC neutral line at any time. Therefore, power can be taken out between the motor control common point (the live wire access point in the actual circuit) and the two neutral lines to supply power to the power conversion module. However, in order not to affect the remote control function, these two points can only extract power through the first diode and the second diode, that is, only half-wave 110V AC power can be obtained.

[0022] After the power is successfully taken, it is sent to the AC / DC converter to convert it into an industrial-standard 24V DC power supply for use in the control circuit.

[0023] When switching between the local and remote states, the AC / DC conversion circuit will change between 110V AC and 220V AC, so the AC / DC converter requires the support of a PFC circuit with a wide voltage input.

[0024] The switching circuit specifically includes: port 2 of the wiring socket in the switching circuit is connected to one end of the local / remote switching switch, the other end of the local / remote switching switch is connected to port 4 of the wiring socket in the switching circuit, port 3 of the wiring socket in the switching circuit is connected to one end of the first relay coil and is also connected to the short-circuit circuit, port 5 of the wiring socket in the switching circuit is connected to port 4 of the AC / DC converter, port 6 of the wiring socket in the switching circuit is connected to the second end of the forward and reverse switch, the third end of the forward and reverse switch is connected to port 8 of the wiring socket in the switching circuit, the first end of the forward and reverse switch is connected to port 10 of the wiring socket in the switching circuit, port 7 of the wiring socket in the switching circuit is connected to the first normally closed contact in the first relay, port 9 of the wiring socket in the switching circuit is connected to the second normally closed contact in the first relay, the first normally open contact and the second normally open contact in the first relay are both connected to the external power supply wiring socket, and the first input contact and the second input contact in the first relay are both connected to the wiring socket at the motor.

[0025] Specifically, through the two sets of relay contacts of relay K1, i.e. the first relay, the 24V DC power supply in the control circuit is used to power the local motor forward contacts, the local motor reverse contacts and the remote motor forward contacts, and the remote motor reverse contacts are switched.

[0026] The short-circuit circuit specifically includes: a first diode, a second diode and a second relay, wherein the positive electrodes of the first diode and the second diode are connected to port 4 of the AC / DC converter, the first input contact and the second input contact of the second relay, one end of the second relay coil is connected to port 3 of the AC / DC converter, and the other end of the second relay coil is connected to port 3 of the terminal block in the switching circuit, the cathode of the first diode is respectively connected to the first normally open contact in the first relay and the first normally closed contact in the second relay, and the cathode of the second diode is respectively connected to the second normally open contact in the first relay and the second normally closed contact in the second relay.

[0027] Specifically, when the local / remote switch is switched to the local state, the relay does not work, and the two contacts of relay K2, that is, the remote control point on the second relay, are disconnected from the control circuit. The control circuit will have no neutral point, and local control of the motor cannot be achieved.

[0028] The motor needs a complete sinusoidal zero line point to achieve normal forward and reverse rotation, so it cannot be connected to a half-wave rectifier point for power supply.

[0029] In this application, a group of relays is used. When in remote control, relay K2, i.e., the second relay, is powered by a 24V DC power supply in the control circuit. The relay is energized, and the two sets of moving contacts and two normally open contacts of relay K2 are connected. The SAAGOT (Si ne Absolute Access port) short-circuit line, i.e., the short-circuit line, is disconnected, retaining the original remote access state. When switching from remote control to local control state, the relay does not work, and the two sets of moving contacts and normally closed contacts of relay K2 are connected, and the two power-taking diodes, i.e., the first diode D1 and the second diode D2, are short-circuited, so that the half-wave rectification point in the remote state becomes the absolute zero line point in the control loop, and no matter whether the remote control is in the forward state or the reverse state before, a complete sinusoidal power supply circuit is formed, realizing the normal operation of the motor in the local state. This application names this group of short-circuit lines, according to its function in the circuit, the absolute sinusoidal access point acquisition, Si ne Absolute Accessport, as "SAAGOT short-circuit line".

[0030] The state indication circuit specifically includes: a third relay K3 and a fourth relay K4, wherein the first input contact of the third relay is connected to the port 3 of the indicator light socket, one end of the third relay coil is connected to the socket at the motor, one end of the fourth relay coil is connected to the socket at the motor, the other end of the third relay coil, the other end of the fourth relay coil, the first normally open contact of the third relay and the first normally open contact of the fourth relay are all connected to the port 3 of the AC / DC converter, the second normally open contact of the third relay is connected to the external power supply socket, the second normally open contact of the fourth relay is connected to the external power supply socket, the port 1 of the indicator light socket is connected to the socket at the motor, the port 5 of the indicator light socket is connected to the first input contact of the fourth relay, the second input contact of the third relay and the input contact of the fourth relay are both connected to the external power supply socket, the port 2 of the indicator light socket is respectively connected to one end of the third diode and one end of the fourth diode, the port 4 of the indicator light socket is connected to the other end of the third diode, and the port 6 of the indicator light socket is connected to the other end of the fourth diode.

[0031] Specifically, the forward rotation in-position signal and the reverse rotation in-position signal given by the motor are processed independently, and two independent double-group relays K3 and K4 are used. The 24V generated in the circuit is used to power the relays. One group of contacts is used for local lighting indication, and the other group is used for motor status recovery and sent back to the remote control circuit.

[0032] Port 1 of the wiring socket at the motor is connected to port 2 of the AC / DC converter, port 3 of the wiring socket at the motor is connected to the first input contact of the first relay, port 5 of the wiring socket at the motor is connected to the second input contact of the first relay, port 7 of the wiring socket at the motor is connected to port 1 of the AC / DC converter, port 9 of the wiring socket at the motor is connected to one end of the third relay coil, port 11 of the wiring socket at the motor is connected to one end of the fourth relay coil, port 2, port 4 and port 6 of the wiring socket at the motor are all connected to the motor, port 8 of the wiring socket at the motor is connected to the input contact of the manual switch, port 10 of the wiring socket at the motor is connected to the first contact of the manual switch, and port 12 of the wiring socket at the motor is connected to the third contact of the manual switch.

[0033] Specifically, the forward rotation into position signal and the reverse rotation into position signal given by the motor are processed independently, and two independent double-group relays K3, i.e. the third relay and K4, i.e. the fourth relay, are used. The 24V generated in the circuit is used to power the relays. One group of contacts is used for local lighting indication, and the other group is used for motor status restoration and sent back to the remote control circuit.

[0034] In the above, the wiring socket at the motor in the loop and the wiring socket at the remote access point are completely one-to-one corresponding, which not only retains the original remote control function, but also adds the functions of power supply, local / remote switching, local control, and local status display.

[0035] It should be understood that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or there may be an intervening element at the same time; when an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element at the same time. In addition, the "connection" used here may include wireless connection; the term "and / or" used includes any unit and all combinations of one or more associated listed items.

[0036] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0037] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

[0038] The above contents are further detailed descriptions of the present invention in combination with specific preferred implementations, and the specific implementation of the present invention cannot be considered to be limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. A forward and reverse AC motor control switching circuit, characterized in that: The circuit comprises: The control power supply circuit is connected to the motor power supply line to supply power to the switching circuit. The switching circuit is used to switch the motor to local or remote control. The short-circuit circuit is used to form a neutral point when the motor is switched to local control so that the motor can work normally. The status indication circuit is used to indicate the motor status.

2. The forward and reverse AC motor control switching circuit according to claim 1, characterized in that: The control power supply circuit includes an AC / DC converter, port 1 of the AC / DC converter is connected to port 1 of the terminal block in the switching circuit, port 2 of the AC / DC converter is connected to port 1 of the terminal block at the motor, port 1 of the terminal block at the motor is also connected to port 2 of the external power supply terminal block, and port 3 and port 4 of the AC / DC converter are respectively connected to the switching circuit and the short-circuit circuit.

3. The forward and reverse AC motor control switching circuit according to claim 2, characterized in that: The switching circuit specifically includes: port 2 of the wiring socket in the switching circuit is connected to one end of the local / remote switching switch, the other end of the local / remote switching switch is connected to port 4 of the wiring socket in the switching circuit, port 3 of the wiring socket in the switching circuit is connected to one end of the first relay coil and is also connected to the short-circuit circuit, port 5 of the wiring socket in the switching circuit is connected to port 4 of the AC / DC converter, port 6 of the wiring socket in the switching circuit is connected to the second end of the forward and reverse switch, the third end of the forward and reverse switch is connected to port 8 of the wiring socket in the switching circuit, the first end of the forward and reverse switch is connected to port 10 of the wiring socket in the switching circuit, port 7 of the wiring socket in the switching circuit is connected to the first normally closed contact in the first relay, port 9 of the wiring socket in the switching circuit is connected to the second normally closed contact in the first relay, the first normally open contact and the second normally open contact in the first relay are both connected to the external power supply wiring socket, and the first input contact and the second input contact in the first relay are both connected to the wiring socket at the motor.

4. The forward and reverse AC motor control switching circuit according to claim 3, characterized in that: The short-circuit circuit specifically includes: a first diode, a second diode and a second relay, wherein the positive electrodes of the first diode and the second diode are connected to port 4 of the AC / DC converter, the first input contact and the second input contact of the second relay, one end of the second relay coil is connected to port 3 of the AC / DC converter, and the other end of the second relay coil is connected to port 3 of the terminal block in the switching circuit, the cathode of the first diode is respectively connected to the first normally open contact in the first relay and the first normally closed contact in the second relay, and the cathode of the second diode is respectively connected to the second normally open contact in the first relay and the second normally closed contact in the second relay.

5. The forward and reverse AC motor control switching circuit according to claim 4, characterized in that: The state indication circuit specifically includes: a third relay and a fourth relay, wherein the first input contact of the third relay is connected to the port 3 of the indicator light socket, one end of the third relay coil is connected to the socket at the motor, one end of the fourth relay coil is connected to the socket at the motor, the other end of the third relay coil, the other end of the fourth relay coil, the first normally open contact of the third relay and the first normally open contact of the fourth relay are all connected to the port 3 of the AC / DC converter, the second normally open contact of the third relay is connected to the external power supply socket, the second normally open contact of the fourth relay is connected to the external power supply socket, the port 1 of the indicator light socket is connected to the socket at the motor, the port 5 of the indicator light socket is connected to the first input contact of the fourth relay, the second input contact of the third relay and the input contact of the fourth relay are both connected to the external power supply socket, the port 2 of the indicator light socket is respectively connected to one end of the third diode and one end of the fourth diode, the port 4 of the indicator light socket is connected to the other end of the third diode, and the port 6 of the indicator light socket is connected to the other end of the fourth diode.

6. The forward and reverse AC motor control switching circuit according to claim 5, characterized in that: Port 1 of the wiring socket at the motor is connected to port 2 of the AC / DC converter, port 3 of the wiring socket at the motor is connected to the first input contact of the first relay, port 5 of the wiring socket at the motor is connected to the second input contact of the first relay, port 7 of the wiring socket at the motor is connected to port 1 of the AC / DC converter, port 9 of the wiring socket at the motor is connected to one end of the third relay coil, port 11 of the wiring socket at the motor is connected to one end of the fourth relay coil, port 2, port 4 and port 6 of the wiring socket at the motor are all connected to the motor, port 8 of the wiring socket at the motor is connected to the input contact of the manual switch, port 10 of the wiring socket at the motor is connected to the first contact of the manual switch, and port 12 of the wiring socket at the motor is connected to the third contact of the manual switch.

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