start-up circuit
By introducing a power-off delay module into the starting circuit, a time-delay self-locking circuit is provided for the contactor control module, which solves the problem of power system flashover caused by lightning interference and ensures the stable operation of production equipment.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- JILIN SINO MICROELECTRONICS CO LTD
- Filing Date
- 2025-06-16
- Publication Date
- 2026-06-23
Smart Images
Figure CN224401397U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of circuit control, and more specifically, to a startup circuit. Background Technology
[0002] Spring and summer are accompanied by thunderstorms, and lightning interference causes power system outages, which in turn leads to unplanned shutdowns of production equipment every year, significantly impacting enterprise production. Utility Model Content
[0003] To overcome the technical problems mentioned in the above background, embodiments of this application provide a startup circuit, the startup circuit comprising:
[0004] A power module, comprising a first terminal and a second terminal;
[0005] A contactor control module, comprising a first terminal, a second terminal, and a self-locking contact, wherein the first terminal of the contactor control module is connected to the first terminal of the power supply module, and the second terminal of the contactor control module is connected to the second terminal of the power supply module;
[0006] A power-off delay module includes a first terminal, a second terminal, and a normally open contact. The first terminal of the power-off delay module is connected to the first terminal of the power module, the second terminal of the power-off delay module is connected to the second terminal of the power module, and the normally open contact is connected to the self-locking contact.
[0007] In one possible implementation, the contactor control module includes a start button and an AC contactor;
[0008] The start button includes a first end and a second end, and the first end of the start button is connected to the first end of the power module.
[0009] The AC contactor includes a coil and a self-locking contact;
[0010] The coil includes a first end and a second end, and the first end of the coil is connected to the second end of the start switch.
[0011] In one possible implementation, the contactor control module further includes a stop button;
[0012] The stop button includes a first end and a second end. The first end of the stop button is connected to the first end of the power module, and the second end of the stop button is connected to the first end of the start button.
[0013] In one possible implementation, the power-off delay module includes a relay, which includes a first terminal, a second terminal, and a normally open contact. The first terminal of the relay is connected to the second terminal of the stop button, the second terminal of the relay is connected to the second terminal of the power supply module, and the normally open contact of the relay is connected to the self-locking contact of the AC contactor.
[0014] In one possible implementation, the startup circuit further includes an overload protection module, which includes a first terminal and a second terminal. The first terminal of the overload protection module is connected to the first terminal of the power supply module, and the second terminal of the overload protection module is connected to the first terminal of the contactor control module.
[0015] In one possible implementation, the second end of the overload protection module is connected to the first end of the stop button.
[0016] In one possible implementation, the starting circuit further includes a load module and a contactor main circuit module;
[0017] The contactor main circuit module includes a first end and a second end, and the first end of the contactor main circuit module is connected to the first end of the power supply module.
[0018] The load module includes a first end and a second end. The first end of the load module is connected to the second end of the contactor main circuit module, and the second end of the load module is connected to the second end of the power supply module.
[0019] In one possible implementation, the load module includes a motor with a first end and a second end. The first end of the motor is connected to the second end of the contactor main circuit module, and the second end of the motor is connected to the second end of the power supply module.
[0020] In one possible implementation, the load module further includes a thermal relay, which has a first terminal and a second terminal. The first terminal of the thermal relay is connected to the second terminal of the contactor main circuit module, and the second terminal of the thermal relay is connected to the first terminal of the motor.
[0021] In one possible implementation, the power module includes a power supply and a circuit breaker, the circuit breaker having a first terminal and a second terminal, the first terminal of the circuit breaker being connected to the power supply, and the second terminal of the circuit breaker being connected to the first terminal of the contactor main circuit module.
[0022] Based on any of the above aspects, this application provides a starting circuit. The starting circuit includes: a power module, which includes a first terminal and a second terminal; a contactor control module, which includes a first terminal, a second terminal, and a self-locking contact, wherein the first terminal of the contactor control module is connected to the first terminal of the power module, and the second terminal of the contactor control module is connected to the second terminal of the power module; and a power-off delay module, which includes a first terminal, a second terminal, and a normally open contact, wherein the first terminal of the power-off delay module is connected to the first terminal of the power module, the second terminal of the power-off delay module is connected to the second terminal of the power module, and the normally open contact is connected to the self-locking contact. By connecting the normally open contact of the power-off delay module to the self-locking contact of the contactor control module, when the voltage of the power module fluctuates under the influence of lightning, the power-off delay module can provide another self-locking circuit for the contactor control module. When the voltage of the power module returns to normal, the contactor control module can resume operation in a timely manner, thereby avoiding the circuit from being affected by lightning and ensuring production. Attached Figure Description
[0023] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings required in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.
[0024] Figure 1 This is a circuit diagram of a startup circuit in related technologies;
[0025] Figure 2 A schematic diagram of a circuit module for a startup circuit provided in an embodiment of this application;
[0026] Figure 3 A schematic diagram of a circuit module for a startup circuit provided in another embodiment of this application;
[0027] Figure 4 This is a circuit diagram of the startup circuit provided in this embodiment. Detailed Implementation
[0028] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.
[0029] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.
[0030] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.
[0031] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In addition, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.
[0032] It should be noted that, where there is no conflict, different features in the embodiments of this application can be combined with each other.
[0033] Further research by the inventors revealed that, from an electrical perspective, the flashover phenomenon occurs when a lightning strike causes current interference in the power grid, resulting in voltage fluctuations. This causes a momentary drop in voltage in the power supply circuit, which then returns to normal almost instantly (within milliseconds). This phenomenon causes the coils of major starting circuits such as relays and contactors in the electrical control system to momentarily lose power and spring up. When the voltage returns to normal, the start button cannot reset in time, leading to equipment shutdown.
[0034] Please refer to Figure 1 , Figure 1 A circuit diagram of the starting circuit in the related technology is shown. The starting principle of the starting circuit is as follows: When the start button SB2 is pressed, phase line L1 passes through circuit breaker Q1, overload protection module FU, stop button SB1, and start button SB2 to the coil of contactor KM. The coil is energized and closes, and the main circuit of KM is closed. The thermal relay FR is energized, the motor M runs, and the normally open contact of KM closes simultaneously. L1 also reaches the coil through the normally open contact of KM, providing self-locking for the coil. When SB2 is released, because the normally open contact of KM is in the closed state, the coil will not spring back up, KM remains energized, and M continues to run.
[0035] The inventors discovered that when the voltage in the circuit fluctuates, specifically when the L1 voltage fluctuates instantaneously, the phase voltage does not meet the rated minimum operating conditions of the KM coil. The coil springs up, all contacts of KM open, the normally open contacts lose their self-locking function and cannot automatically re-engage, and M stops operating. At this point, the circuit can only be restarted by manually pressing the start button SB2, which disrupts production.
[0036] In order to solve the technical problems mentioned in the background section and the aforementioned technical problems, the inventor has innovatively designed the following technical solutions, and the specific implementation scheme of this application will be described in detail below with reference to the accompanying drawings.
[0037] Please see Figure 2 , Figure 2 This is a schematic diagram of a circuit module for a starting circuit provided in an embodiment of this application. The starting circuit includes a power supply module 10, a contactor control module 20, and a power-off delay module 30. The power supply module 10 includes a first terminal and a second terminal. The contactor control module 20 includes a first terminal, a second terminal, and a self-locking contact. The first terminal of the contactor control module 20 is connected to the first terminal of the power supply module 10, and the second terminal of the contactor control module 20 is connected to the second terminal of the power supply module 10. In this case, the power supply module 10 and the contactor control module 20 form a series circuit. Further, the power-off delay module 30 includes a first terminal, a second terminal, and a normally open contact. The first terminal of the power-off delay module 30 is connected to the first terminal of the power supply module 10, the second terminal of the power-off delay module 30 is connected to the second terminal of the power supply module 10, and the normally open contact is connected to the self-locking contact. The power-off delay module 30 is connected in parallel with the contactor control module 20.
[0038] The power supply module 10 can be a DC power supply module or an AC power supply module. Preferably, the power supply module 10 is an AC power supply module, with its first terminal being the live wire terminal and its second terminal being the neutral wire terminal.
[0039] Furthermore, the contactor control module 20 may include a contactor and electrical components or modules for controlling the operation of the contactor. The working principle of the contactor is as follows: when the contactor coil is energized by the power module 10, the coil current generates a magnetic field. The generated magnetic field causes the stationary iron core to generate an electromagnetic attraction that draws in the moving iron core, thereby actuating the contactor. The normally closed contact opens, and the normally open contact closes; the two are linked. When the coil is de-energized, the electromagnetic attraction disappears, and the armature is released under the action of the release spring, causing the contacts to return to their original position. The normally open contact opens, and the normally closed contact closes. In other words, the normally open contact of the contactor is the contactor's self-locking contact.
[0040] The power-off delay module 30 refers to a module whose contacts open after a delay when the starting circuit is disconnected. The power-off delay module 30 may include a power-off delay relay, and may also include other electrical devices or modules with a delayed power-off effect.
[0041] In this embodiment of the application, the power supply module 10 and the contactor control module 20 are connected in series to form a complete circuit loop in the starting circuit, the contactor control module 20 is connected in parallel with the power-off delay module 30, and the normally open contact of the power-off delay module 30 is connected to the self-locking contact of the contactor control module 20. When the starting circuit is affected by lightning, the voltage of the power supply module 10 fluctuates instantaneously. At that instant, the power supplied by the power supply module 10 to the contactor cannot meet the operating conditions of the contactor control module 20. At this time, the self-locking contact in the contactor control module 20 opens. However, since the power-off delay module 30 has a delayed power-off function, the power-off delay contact will not open immediately when the self-locking contact opens. It will only open the normally open contact after the preset delay time is met. Therefore, the power-off delay module 30 provides a self-locking circuit for the contactor control module 20 within the preset delay time. If the preset delay time is longer than the duration of the lightning strike, the contactor control module 20 can be restored in time after the power supply module 10 resumes power supply, thereby avoiding the power outage of the starting circuit caused by voltage fluctuation and ensuring production.
[0042] In one embodiment of this application, the contactor control module 20 includes a start button and a control circuit for an AC contactor. The start button includes a first terminal and a second terminal, and the first terminal of the start button is connected to the first terminal of the power supply module 10. The control circuit for the AC contactor includes a coil and a self-locking contact. The coil includes a first terminal and a second terminal, and the first terminal of the coil is connected to the second terminal of the start switch.
[0043] In this embodiment, the start button, power module 10, and coil form a series circuit. Pressing the start button causes current to flow from the power module 10 to the coil of the AC contactor. Upon receiving the current, the coil of the AC contactor is energized and engages. Releasing the start button prevents the coil from springing up because the normally open contact of the AC contactor is in the closed state. Controlling the AC contactor via the start button facilitates control over the current flowing to the AC contactor.
[0044] In one possible implementation, the contactor control module 20 further includes a stop button. The stop button includes a first end and a second end, the first end of the stop button being connected to the first end of the power module 10, and the second end of the stop button being connected to the first end of the start button.
[0045] In this embodiment, the stop button forms a series circuit with the power module 10, the start button, and the control circuit of the AC contactor. Using the stop button to disconnect the current loop and the start button to connect the current loop improves the convenience and reliability of circuit connection and disconnection, and also meets control requirements in different environments.
[0046] In one possible implementation, the power-off delay module 30 includes a relay, which includes a first terminal, a second terminal, and a normally open contact. The first terminal of the relay is connected to the second terminal of the stop button, the second terminal of the relay is connected to the second terminal of the power module 10, and the normally open contact of the relay is connected to the self-locking contact of the AC contactor.
[0047] The relay can be either a time relay or a thermal relay. A time relay has a time delay control function, while a thermal relay triggers the protection action through the thermal effect of current. In this embodiment, a time delay is required to disconnect the AC relay; therefore, a time relay is preferred in this embodiment.
[0048] In this embodiment, the normally open contact of the relay is connected to the self-locking contact of the AC contactor. When the self-locking contact of the AC contactor is disconnected, the normally open contact of the relay will remain connected within a preset delay period, thereby providing another current loop to the AC contactor through the relay, thus ensuring the normal operation of the AC contactor within the preset delay period.
[0049] In one possible implementation, the startup circuit further includes an overload protection module, which includes a first terminal and a second terminal. The first terminal of the overload protection module is connected to the first terminal of the power supply module 10, and the second terminal of the overload protection module is connected to the first terminal of the contactor control module 20.
[0050] The overload protection module can be a fuse or a thermal relay. Preferably, the overload protection module is a fuse, which is used to cut off the circuit by melting when the current in the circuit exceeds the rated value, preventing equipment damage or fire caused by excessive current.
[0051] In this embodiment, the overload protection module is used to connect the power module 10 and the contactor control module 20 to protect the power module 10 and the contactor control module 20 and prevent damage to the equipment or devices caused by excessive current between the power module 10 and the contactor control module 20.
[0052] Specifically, the second end of the overload protection module is connected to the first end of the stop button.
[0053] In this embodiment, since the stop button in the contactor control module 20 is a device directly connected to the power module 10 in the series circuit formed by the power module 10 and the contactor control module 20, in order to protect the power module 10 and the contactor control module 20, the overload protection module should be set between the power module 10 and the stop button.
[0054] In one possible implementation, please refer to Figure 3 The starting circuit further includes a load module 40 and a contactor main circuit module 50. The contactor main circuit module 50 includes a first terminal and a second terminal, with the first terminal connected to the first terminal of the power supply module 10. The load module 40 includes a first terminal and a second terminal, with the first terminal connected to the second terminal of the contactor main circuit module 50 and the second terminal connected to the second terminal of the power supply module 10.
[0055] The load module 40 may include devices or equipment that convert electrical energy into mechanical energy, thermal energy, or light energy, such as motors, heating tubes, electric furnaces, and electric lights.
[0056] In this embodiment, the power module 10, the contactor main circuit module 50, and the load module 40 form a series circuit so that the load module 40 can be started and disconnected through the contactor main circuit module 50.
[0057] Specifically, the load module 40 includes a motor, which has a first end and a second end. The first end of the motor is connected to the second end of the contactor main circuit module 50, and the second end of the motor is connected to the second end of the power supply module 10.
[0058] The contactor main circuit module 50 forms a series circuit with the motor, which is used to control the start and stop of the motor.
[0059] Furthermore, the load module 40 also includes a thermal relay, which has a first end and a second end. The first end of the thermal relay is connected to the second end of the contactor main circuit module 50, and the second end of the thermal relay is connected to the first end of the motor.
[0060] Thermal relays are used for overload protection of motors.
[0061] In this embodiment, when the motor is overloaded, the thermal relay cuts off the circuit to protect the motor.
[0062] In one possible implementation, the power module 10 includes a power supply and a circuit breaker, the circuit breaker including a first terminal and a second terminal, the first terminal of the circuit breaker being connected to the power supply, and the second terminal of the circuit breaker being connected to the first terminal of the contactor main circuit module 50.
[0063] Circuit breakers can be used to disconnect and connect load circuits, as well as to disconnect faulty circuits, to prevent accidents from escalating and to ensure safe operation.
[0064] In this embodiment, a circuit breaker is added to the power module 10 to protect the power module 10 and other modules or devices in the circuit, thereby improving the safety of the circuit.
[0065] Please refer to Figure 4 In the specific implementation process, taking the power supply module 10 as a three-phase five-wire power supply, the overload protection module as a fuse, the contactor control module 20 and the contactor main circuit module 50 as an AC contactor, the power-off delay module 30 as a time relay, and the load module 40 as a motor as an example, the power supply module 10, the overload protection module, the contactor main circuit module 50, and the load module 40 form a series circuit, while the contactor control module 20 and the power-off delay module 30 form a parallel circuit. When the start button SB2 in the contactor control module 20 is pressed, the phase line L1 in the power supply module 10 passes through the fuse FU, the stop buttons SB1 and SB2 to the coil of the AC contactor KM. The coil is energized and closes, the KM main circuit closes, and the motor M in the load module runs. At the same time, the normally open contact (self-locking contact) of KM closes. The L1 phase line also passes through the normally open contact of KM to reach the coil, providing self-locking for the coil. When SB2 is released, because the normally open contact of KM is in the closed state, the coil will not spring up, the AC contactor remains energized, and M continues to run. When the voltage generated by thunderstorms affects the power module 10, the L1 phase line voltage fluctuates instantaneously. If the L1 phase line voltage does not meet the rated minimum operating conditions of the KM coil, the coil springs up, and all contacts of KM open. Since the normally open contact of the time relay KT is connected to the self-locking contact of KM, KT provides a second self-locking circuit for KM. When the voltage fluctuates instantaneously, the coils of KM and KT simultaneously lose power and spring up. However, KT operates with a power-off delay; the normally open contact remains closed for a preset delay period after power failure. If the preset delay period of KT is longer than the voltage fluctuation time, KM can start immediately when the voltage instantly returns to normal, ensuring the motor continues to run. This effectively prevents the starting circuit from stopping due to voltage fluctuations, ensuring continued production.
[0066] In summary, this application provides a starting circuit. The starting circuit includes a power supply module, which includes a first terminal and a second terminal; a contactor control module, which includes a first terminal, a second terminal, and a self-locking contact. The first terminal of the contactor control module is connected to the first terminal of the power supply module, and the second terminal of the contactor control module is connected to the second terminal of the power supply module; and a power-off delay module, which includes a first terminal, a second terminal, and a normally open contact. The first terminal of the power-off delay module is connected to the first terminal of the power supply module, and the second terminal of the power-off delay module is connected to the second terminal of the power supply module. The normally open contact is connected to the self-locking contact of the contactor control module. By connecting the normally open contact of the power-off delay module to the self-locking contact of the contactor control module, when the voltage of the power supply module fluctuates under the influence of lightning, the power-off delay module can provide another self-locking circuit for the contactor control module. When the voltage of the power supply module returns to normal, the contactor control module can promptly return to normal, thereby avoiding the circuit being affected by lightning and ensuring production.
[0067] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.
Claims
1. A startup circuit, characterized in that, The startup circuit includes: A power module, comprising a first terminal and a second terminal; A contactor control module, comprising a first terminal, a second terminal, and a self-locking contact, wherein the first terminal of the contactor control module is connected to the first terminal of the power supply module, and the second terminal of the contactor control module is connected to the second terminal of the power supply module; A power-off delay module includes a first terminal, a second terminal, and a normally open contact. The first terminal of the power-off delay module is connected to the first terminal of the power module, the second terminal of the power-off delay module is connected to the second terminal of the power module, and the normally open contact is connected to the self-locking contact.
2. The startup circuit as described in claim 1, characterized in that, The contactor control module includes a start button and an AC contactor; The start button includes a first end and a second end, and the first end of the start button is connected to the first end of the power module. The AC contactor includes a coil and a self-locking contact; The coil includes a first end and a second end, and the first end of the coil is connected to the second end of the start switch.
3. The startup circuit as described in claim 2, characterized in that, The contactor control module also includes a stop button; The stop button includes a first end and a second end. The first end of the stop button is connected to the first end of the power module, and the second end of the stop button is connected to the first end of the start button.
4. The startup circuit as described in claim 3, characterized in that, The power-off delay module includes a relay, which includes a first terminal, a second terminal, and a normally open contact. The first terminal of the relay is connected to the second terminal of the stop button, the second terminal of the relay is connected to the second terminal of the power module, and the normally open contact of the relay is connected to the self-locking contact of the AC contactor.
5. The startup circuit as described in claim 3, characterized in that, The starting circuit also includes an overload protection module, which has a first terminal and a second terminal. The first terminal of the overload protection module is connected to the first terminal of the power supply module, and the second terminal of the overload protection module is connected to the first terminal of the contactor control module.
6. The startup circuit as described in claim 5, characterized in that, The second end of the overload protection module is connected to the first end of the stop button.
7. The startup circuit as described in claim 1, characterized in that, The starting circuit also includes a load module and a contactor main circuit module; The contactor main circuit module includes a first end and a second end, and the first end of the contactor main circuit module is connected to the first end of the power supply module. The load module includes a first end and a second end. The first end of the load module is connected to the second end of the contactor main circuit module, and the second end of the load module is connected to the second end of the power supply module.
8. The startup circuit as described in claim 7, characterized in that, The load module includes a motor, which has a first end and a second end. The first end of the motor is connected to the second end of the contactor main circuit module, and the second end of the motor is connected to the second end of the power supply module.
9. The startup circuit as described in claim 8, characterized in that, The load module also includes a thermal relay, which has a first terminal and a second terminal. The first terminal of the thermal relay is connected to the second terminal of the contactor main circuit module, and the second terminal of the thermal relay is connected to the first terminal of the motor.
10. The startup circuit according to any one of claims 1-9, characterized in that, The power module includes a power supply and a circuit breaker. The circuit breaker includes a first terminal and a second terminal. The first terminal of the circuit breaker is connected to the power supply, and the second terminal of the circuit breaker is connected to the first terminal of the contactor main circuit module.