Driving circuit and contactor

Abstract

The utility model relates to the field of electrical components, and discloses a driving circuit, which is used for driving a contactor body to operate, and is characterized in that the driving circuit is arranged outside the contactor body, the driving circuit comprises a maintaining circuit, and the maintaining circuit outputs maintaining voltage to maintain the pull-in state of the contactor; the starting circuit is connected with the maintaining circuit in parallel, and the starting circuit outputs starting voltage so as to form a pull-in state of the contactor; wherein the starting circuit is connected with a starting switch, and the starting switch is switched off after the contactor is in a pull-in state. The utility model provides a driving circuit and a contactor which are not easy to damage and easy to replace.

Description

Technical Field

[0001] The present application relates to the field of electrical components, and in particular to a drive circuit and a contactor. Background Art

[0002] In existing container crane electrical control systems, the contactor is installed within the power unit. However, due to the high temperatures within the power unit, the drive circuitry within the contactor unit often deteriorates, necessitating the replacement of the entire contactor. This installation within the power unit makes handling complex and requires approximately two and a half hours of downtime, significantly reducing vessel time efficiency and impacting the schedule of mainline container vessels. Utility Model Content

[0003] The present application mainly solves the technical problem in the prior art that contactors are easily damaged and difficult to replace after being damaged, and provides a drive circuit and contactor that are not easily damaged and easy to replace.

[0004] In order to solve the above technical problems, the present application provides a driving circuit for driving the contactor body to operate, characterized in that the driving circuit is arranged outside the contactor body, and the driving circuit includes

[0005] A holding circuit, wherein the holding circuit outputs a holding voltage to maintain the contactor body in an engaged state;

[0006] A starting circuit, the starting circuit is connected in parallel with the maintaining circuit, and the starting circuit outputs a starting voltage to form the attracting state of the contactor body; wherein,

[0007] The starting circuit is connected to a starting switch, and after the contactor body forms an attracted state, the starting switch is disconnected.

[0008] In one embodiment, the driving circuit further includes:

[0009] An input line and an output line, the holding circuit is connected to the input line and the output line respectively, and the starting circuit is connected to the input line and the output line respectively, so as to form a parallel connection between the holding circuit and the starting circuit.

[0010] In one embodiment, the maintenance circuit includes:

[0011] an AC input line connected to the input circuit;

[0012] a DC output line connected to the output circuit;

[0013] A switching power supply is connected to the AC input line and the DC output line respectively to convert AC power into DC power.

[0014] In one embodiment, the maintenance circuit further includes:

[0015] A first diode is connected in series to the DC output line.

[0016] In one embodiment, the output voltage of the sustaining circuit is 14V to 20V.

[0017] In one embodiment, the startup circuit includes:

[0018] a second diode, wherein a plurality of the second diodes form a second diode assembly, and the second diode assembly is connected to the input line;

[0019] The starting switch is a time-delay relay.

[0020] In one embodiment, the driving circuit further includes:

[0021] A protection circuit, the protection circuit is located between the input circuit and the output circuit, and the protection circuit is connected in parallel with the startup circuit; wherein,

[0022] The protection circuit is used to disconnect the startup circuit when the startup circuit operates for a long time.

[0023] In one embodiment, the protection circuit includes

[0024] a heating resistor, the heating resistor being connected in parallel to the starting circuit;

[0025] A temperature detection device and a protection switch, wherein the protection switch is connected to the output line, the temperature detection device is associated with the protection switch, and the temperature detection device is used to detect the real-time temperature of the heating resistor and compare it with the standard temperature in the temperature detection device. When the real-time temperature is greater than the standard temperature, the protection switch is disconnected.

[0026] In one embodiment, a third diode and a varistor are connected in parallel on the output line.

[0027] On the other hand, the present application provides a contactor for switching a power unit, characterized in that it further comprises:

[0028] The contactor body is connected to the drive circuit via the output line. The contactor body is located inside the power unit, and the drive circuit is located outside the power unit.

[0029] Compared to existing technologies, the drive circuit is installed separately from the contactor body. During installation, the drive circuit is installed outside the power unit, while the contactor body is installed inside the power unit. This prevents damage to the drive circuit due to the high temperature environment inside the power unit. Furthermore, the separation of the drive circuit and the contactor body facilitates replacement of the drive circuit, thereby reducing contactor maintenance time.

[0030] Therefore, the present invention has the characteristics of reasonable structure and convenient use. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Attachment Figure 1 This is a circuit diagram of the driving circuit of this application.

[0032] Description of the numbers in the figure:

[0033] 10. Driving circuit;

[0034] Holding circuit; 110, AC input line; 120, DC output line; 130, switching power supply; 140, first diode; 200, starting circuit; 210, starting switch; 220, second diode;

[0035] 300, output line;

[0036] 400, input line;

[0037] 500, protection circuit; 510, heating resistor; 520, protection switch; 530, third diode; 540, varistor. DETAILED DESCRIPTION

[0038] In order to make the purpose, features, and advantages of this application more obvious and easy to understand, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of this application.

[0039] The prior art has the technical problem that the contactor is easily damaged and difficult to replace after being damaged.

[0040] To this end, the present application provides a driving circuit for driving the contactor body to operate, characterized in that the driving circuit is arranged outside the contactor body, and the driving circuit includes

[0041] A holding circuit, wherein the holding circuit outputs a holding voltage to maintain the contactor body in an engaged state;

[0042] A starting circuit, the starting circuit is connected in parallel with the maintaining circuit, and the starting circuit outputs a starting voltage to form the attracting state of the contactor body; wherein,

[0043] The starting circuit is connected to a starting switch, and after the contactor body forms an attracted state, the starting switch is disconnected.

[0044] On the other hand, the present application provides a contactor for a power unit, characterized in that it includes the drive circuit described in embodiment 1, and further includes:

[0045] The contactor body is connected to the drive circuit via the output line. The contactor body is located inside the power unit, and the drive circuit is located outside the power unit.

[0046] Example 1:

[0047] Please refer to the attached Figure 1 As shown, a specific implementation method of the drive circuit of the present application is shown. The drive circuit 10 in the present application is a part of the contactor. Furthermore, the contactor also includes a contactor body. The contactor body refers to other component structures in the contactor except the drive circuit 10. In the present application, the contactor body includes at least a contactor coil, an armature, a contact point, an elastic member, etc. The contactor is usually used in conjunction with a power unit. In the prior art, the drive circuit 10 is installed in the contactor body, and the contactor is installed in the power unit at the same time. The high temperature environment in the power unit can easily cause damage to the drive circuit 10.

[0048] Attachment Figure 1 This is a circuit diagram of the driving circuit 10 of the present application. Figure 1 As shown, the drive circuit 10 of the present application is used to drive the contactor body to operate. Furthermore, driving the contactor body to move refers to realizing the on and off of the contactor body, that is, realizing the switching of the contactor body between the energized state and the disconnected state. In the present application, the drive circuit 10 is separated from the contactor, and the drive circuit 10 is arranged outside the contactor body, thereby creating conditions for the separate installation of the drive circuit 10. During specific installation, the drive circuit 10 is installed outside the power unit, and the contactor body is installed inside the power unit. Thereby, the impact of the high temperature environment in the power unit on the drive circuit 10 is reduced, so as to reduce the damage rate of the drive circuit 10. Furthermore, after the drive circuit 10 is installed outside the power unit, if the drive circuit 10 needs to be replaced, the drive circuit 10 can be directly replaced without disassembling other components, so as to reduce the maintenance time of the contactor.

[0049] Please refer to the attached Figure 1As shown, the driving circuit 10 of the present application includes an input circuit 400 and an output circuit 300, the maintenance circuit 100 is connected to the input circuit 400 and the output circuit 300 respectively, and the startup circuit 200 is connected to the input circuit 400 and the output circuit 300 respectively to form a parallel connection between the maintenance circuit 100 and the startup circuit 200.

[0050] Please refer to the attached Figure 1 As shown, the drive circuit 10 of the present application includes a starting circuit 200, which outputs a starting voltage. In this application, the starting voltage is used to achieve the pull-in of the contactor body. In this application, when the starting circuit 200 is started, the external power supply generates pulsating DC power through full-bridge rectification, and the inductance of the electromagnetic coil itself is used to obtain smooth DC power to meet the pull-in requirements. To achieve rapid pull-in of the contactor body, the starting voltage must be much greater than the holding voltage.

[0051] In one embodiment, the external power supply is configured to output 220V AC power. The external power supply being configured to output 220V AC power is only one specific implementation of the present application, and the output voltage of the external power supply is not limited to 220V AC power.

[0052] In one embodiment, the starting circuit 200 is configured to output 200V DC. This configuration is merely one specific embodiment of the present invention, and the output voltage of the starting circuit 200 is not limited to 200V DC. This allows the driver circuit 10 to output a high DC voltage at the moment of startup, allowing the electromagnetic coil to obtain a large current and attracting force, thereby achieving the closed state of the contactor body.

[0053] Furthermore, the time it takes for the contactor body of the present application to change from the disconnected state to the closed state under the action of the starting circuit 200 is recorded as T.

[0054] Please refer to the attached Figure 1 As shown, the starting circuit 200 of the present application is connected to a starting switch 210. After the contactor body is in the energized state, the starting switch 210 is disconnected. Disconnecting the starting switch 210 after the contactor body is in the energized state is to prevent the starting circuit 200 from overheating due to long-term operation.

[0055] In one embodiment, the start switch 210 is a time-delay relay, and the start switch 210 disconnects the start circuit 200 after a time T.

[0056] Please refer to the attached Figure 1 As shown, the startup circuit 200 of the present application further includes a second diode 220 . A plurality of second diodes 220 form a second diode assembly, and the second diode assembly is disposed on the input line 400 .

[0057] Please refer to the attached Figure 1 As shown, the drive circuit 10 of the present application also includes a holding circuit 100, which outputs a holding voltage to maintain the contactor body in the closed state. In this application, the holding voltage is lower than the starting voltage, thereby reducing the current of the electromagnetic coil while still maintaining the armature closed, thereby achieving the purpose of saving power and extending the service life of the coil.

[0058] Please refer to the attached Figure 1 As shown, the maintenance circuit 100 of the present application includes an AC input line 110, a DC output line 120 and a switching power supply 130. The AC input line 110 is connected to the input line 400, the DC output line 120 is connected to the output line 300, and the switching power supply 130 is connected to the AC input line 110 and the DC output line 120 respectively to convert AC power into DC power.

[0059] Please refer to the attached Figure 1 As shown, the sustaining circuit 100 of the present application further includes a first diode 140 . The first diode 140 is connected in series to the DC output line 120 . The first diode 140 is used to further stabilize the output voltage.

[0060] In one embodiment, the output voltage of the sustain circuit 100 is 14V to 20V. Furthermore, the output voltage of the sustain circuit 100 is 16.7V.

[0061] Please refer to the attached Figure 1 As shown, the drive circuit 10 of the present application also includes a protection circuit 500. When the startup circuit 200 fails, that is, the startup circuit 200 is in the startup state for a long time, it is easy to cause the electromagnetic coil to burn out. The provision of the protection circuit 500 can prevent the startup circuit 200 from being in the startup state for a long time. In the present application, the protection circuit 500 is located between the input circuit 400 and the output circuit 300, and the protection circuit 500 is connected in parallel with the startup circuit 200. The protection circuit 500 is used to disconnect the startup circuit 200 when the startup circuit 200 is running for a long time.

[0062] Please refer to the attached Figure 1 As shown, the method for determining whether the protection circuit 500 of the present application has been running for a long time is the temperature of the heating resistor 510 in the protection circuit 500. Furthermore, the protection circuit 500 includes the heating resistor 510, a temperature detection device, and a protection switch 520. The heating resistor 510 is connected in parallel to the starting circuit 200, the protection switch 520 is connected to the output line 300, and the temperature detection device is arranged in parallel with the protection switch 520. The temperature detection device is used to detect the real-time temperature of the heating resistor 510 and compare it with the standard temperature in the temperature detection device. When the real-time temperature is greater than the standard temperature, the protection switch 520 is disconnected.

[0063] In one embodiment, the standard temperature in the temperature detection device is 50°C.

[0064] Example 2:

[0065] This application presents a specific embodiment of a contactor, which is used to switch power cells on and off. The contactor comprises a drive circuit and a contactor body, with the contactor body located within the power cell and the drive circuit located outside the power cell. This reduces the impact of the high temperature environment within the power cell on the drive circuit, thereby reducing the damage rate of the drive circuit. Furthermore, once the drive circuit is installed outside the power cell, if the drive circuit needs to be replaced, it can be directly replaced without disassembling other components.

[0066] The contactor of the present application can be formed by modifying an old contactor, and the old contactor refers to an integrated arrangement of the drive circuit and the contactor body, and the old contactor is directly installed in the power unit. The specific process of modifying the old contactor into the contactor of this application is: the first step is to measure the coil and contacts of the old contactor to determine whether the performance is intact, and to modify the old contactor to shield its internal drive circuit. The specific method is to connect the electromagnetic coil directly to the terminal through a wire; the second step is to perform a no-load power-on test on the drive circuit in the embodiment, measure the output voltage, and verify the reliability of the protection circuit action by simulating a fault; the third step is to combine the drive circuit in Example 1 with the modified contactor body. The AC power supply line is connected to the AC input end of the power module, and the DC output end of the power module is connected to the contactor terminal. The sensitivity of the contactor action is tested by repeatedly turning the power on and off. Finally, a long-term attraction stability performance test is required.

[0067] In the description of this specification, the reference terms "one embodiment," "some embodiments," "example," "specific example," or "some examples" mean 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. Moreover, the specific features, structures, materials, or characteristics described may be combined in any appropriate manner in any one or more embodiments or examples. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification, as well as features of different embodiments or examples, unless they are mutually inconsistent.

[0068] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. Throughout the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0069] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A drive circuit for driving a contactor body to operate, characterized in that: The drive circuit is arranged outside the contactor body, and the drive circuit includes A holding circuit, wherein the holding circuit outputs a holding voltage to maintain the contactor body in an engaged state; A starting circuit, the starting circuit is connected in parallel with the maintaining circuit, and the starting circuit outputs a starting voltage to form the attracting state of the contactor body; wherein, The starting circuit is connected to a starting switch, and after the contactor body forms an attracted state, the starting switch is disconnected.

2. The driving circuit according to claim 1, wherein: The driving circuit further includes: An input line and an output line, the holding circuit is connected to the input line and the output line respectively, and the starting circuit is connected to the input line and the output line respectively, so as to form a parallel connection between the holding circuit and the starting circuit.

3. The driving circuit according to claim 2, wherein: The maintenance circuit includes: an AC input line connected to the input circuit; a DC output line connected to the output circuit; A switching power supply is connected to the AC input line and the DC output line respectively to convert AC power into DC power.

4. The driving circuit according to claim 3, wherein: The maintenance circuit further includes: A first diode is connected in series to the DC output line.

5. The driving circuit according to claim 4, wherein: The output voltage of the sustaining circuit is 14V to 20V.

6. The driving circuit according to claim 2, wherein: The startup circuit includes, a second diode, wherein a plurality of the second diodes form a second diode assembly, and the second diode assembly is connected to the input line; The starting switch is a time-delay relay.

7. The driving circuit according to claim 6, wherein: The driving circuit further includes: A protection circuit, the protection circuit is located between the input circuit and the output circuit, and the protection circuit is connected in parallel with the startup circuit; wherein, The protection circuit is used to disconnect the startup circuit when the startup circuit operates for a long time.

8. The driving circuit according to claim 7, wherein: The protection circuit includes a heating resistor, the heating resistor being connected in parallel to the starting circuit; A temperature detection device and a protection switch, wherein the protection switch is connected to the output line, the temperature detection device is associated with the protection switch, and the temperature detection device is used to detect the real-time temperature of the heating resistor and compare it with the standard temperature in the temperature detection device. When the real-time temperature is greater than the standard temperature, the protection switch is disconnected.

9. The driving circuit according to claim 7, wherein: A third diode and a varistor are arranged in parallel on the output line.

10. A contactor for switching a power unit, characterized in that: The driving circuit according to any one of claims 2 to 9 further comprises: The contactor body is connected to the drive circuit via the output line. The contactor body is located inside the power unit, and the drive circuit is located outside the power unit.

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