Contactor and electrical device

Abstract

The application relates to a contactor and an electrical device. The contactor comprises a rectification module, which is used for full-wave rectification of an input of the contactor during starting and half-wave rectification of the input of the contactor during maintaining; an electromagnetic module, which comprises at least two coils, the at least two coils serving as starting windings during starting of the contactor, a part of the at least two coils serving as first maintaining windings during maintaining of the contactor, another part of the at least two coils generating a reactance as a voltage reduction component together with a pulsating direct current obtained through the half-wave rectification and also serving as second maintaining windings; and a conversion module connected with the rectification module, the conversion module being used for outputting starting current of full-wave rectification of the rectification module to the electromagnetic module during starting and outputting maintaining current of half-wave rectification of the rectification module to the electromagnetic module during maintaining. The contactor is used to omit a voltage reduction component, and to eliminate the problem of repeated starting and stopping of the contactor caused by faults of the voltage reduction component.

Description

Technical Field

[0001] This application relates to the field of electrical technology, and in particular to a contactor and electrical equipment. Background Technology

[0002] With the rapid development of automation, artificial intelligence, smart sensors, computer technology, control technology, and electronic technology, control electrical appliances are playing an increasingly important role and have become more widely used. There are many types of control electrical appliances, such as AC contactors and DC contactors, which can be used to frequently connect or disconnect various terminal electrical appliances over long distances. They are commonly used in the control of everyday equipment such as electric motors, transformers, and lighting equipment. Their applications are broad, playing a vital role in agriculture, industry, transportation, and all aspects of daily life and production, significantly impacting people's lives and socio-economic development.

[0003] However, existing AC energy-saving contactors generally suffer from safety and reliability issues. This is because most AC energy-saving contactors (except for electronic ones, which are not widely accepted by users due to cost and reliability concerns) employ high-current or high-voltage starting and low-current or low-voltage holding to achieve energy savings. To achieve low current or low voltage, most systems use a step-down component, which is not directly related to the starting component. If the starting component functions normally but the step-down component fails, the contactor will immediately start and stop repeatedly. This can damage the contactor, damage the load equipment (such as motors, control components, etc.), or even cause a production accident. Therefore, this is a major reason why AC energy-saving contactors have not been widely accepted by the market. Summary of the Invention

[0004] Therefore, it is necessary to develop a contactor and related electrical equipment that can ensure safety and reliability in response to the above-mentioned technical problems.

[0005] In a first aspect, this application provides a contactor, the contactor comprising:

[0006] The rectifier module is used to perform full-wave rectification on the input of the contactor during startup and half-wave rectification on the input of the contactor during holding.

[0007] The electromagnetic module includes at least two coils. When the contactor is started, all two coils serve as starting windings. When the contactor is held, a portion of the at least two coils serves as a first holding winding, and another portion, together with the pulsating DC obtained by half-wave rectification, generates an inductive reactance as a step-down component and also serves as a second holding winding.

[0008] A conversion module is connected to the rectifier module. The conversion module is used to output the full-wave rectified starting current of the rectifier module to the electromagnetic module when starting up, and to switch the rectifier module to half-wave rectified pulsating DC as the holding current when holding up.

[0009] In one embodiment, the at least two coils are obtained by tapping the center of a coil, and the number of turns on both sides of the tap is equal or unequal, and the magnitudes of the starting current and the holding current are adjusted based on the number of turns on both sides of the tap.

[0010] In one embodiment, the at least two coils are independent coils connected in series, the number of turns of each independent coil may be equal or unequal, and the magnitudes of the starting current and the holding current are adjusted based on the number of turns of each independent coil.

[0011] In one embodiment, the switching module includes a first position switch and a second position switch;

[0012] The first terminal of the rectifier module is connected to the first terminal of the external AC power supply, the second terminal is connected to the first terminal of the electromagnetic module, the third terminal is connected to the second terminal of the first position switch, and the fourth terminal is connected to the first terminal of the second position switch; the first terminal of the first position switch is connected to the second terminal of the external AC power supply, and the second terminal of the second position switch is connected to the third terminal of the electromagnetic module.

[0013] When the contactor is started, the first position switch and the second position switch are closed, the rectifier module performs full-wave rectification to obtain the starting current, and outputs the starting current to the electromagnetic module; when the distance between the moving iron core and the stationary iron core in the electromagnetic module is less than the distance threshold, the first position switch and the second position switch are opened in sequence, and the rectifier module switches to half-wave rectified pulsating DC as the holding current output to the electromagnetic module.

[0014] In one embodiment, the contactor further includes a first diode, the positive terminal of which is connected to a third terminal of the electromagnetic module, and the negative terminal of which is connected to a second terminal of an external alternating current source.

[0015] In one embodiment, the contactor further includes a second diode, the negative terminal of which is connected to a first terminal of the electromagnetic module, and the positive terminal of which is connected to a second terminal of the electromagnetic module, wherein the second terminal of the electromagnetic module is a tap or connection point of the at least two coils.

[0016] In one embodiment, the switching module includes a first position switch and a second position switch; the contactor further includes a trigger head, which moves with the moving iron core of the electromagnetic module. During the movement of the moving iron core towards the stationary iron core of the electromagnetic module, the first position switch and the second position switch are sequentially opened by the trigger head.

[0017] In one embodiment, the rectifier module is a bridge rectifier circuit.

[0018] In one embodiment, the electromagnetic module includes two coils.

[0019] Secondly, this application provides an electrical device including the contactor described in any of the above embodiments.

[0020] The aforementioned contactor and electrical equipment, wherein the contactor includes: a rectifier module for performing full-wave rectification on the contactor input during startup and half-wave rectification on the contactor input during holding; an electromagnetic module including at least two coils, wherein both coils serve as starting windings during contactor startup, and a portion of the at least two coils serve as a first holding winding during contactor holding, while the other portion primarily functions to work with the pulsating DC obtained from the half-wave rectification to generate an inductive reactance serving as a voltage reduction component and simultaneously as a second holding winding; and a conversion module connected to the rectifier module, wherein the conversion module outputs the full-wave rectified starting current of the rectifier module to the electromagnetic module during startup, and switches the rectifier module to output the half-wave rectified current to the electromagnetic module during holding. If the portion of the electromagnetic module that also functions as a reactor fails, startup will immediately stop, thus not only eliminating the need for a voltage reduction component but also preventing the contactor from repeatedly starting and stopping due to a failure of the voltage reduction component. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this application or related technologies, the drawings used in the description of the embodiments of this application or related technologies will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 A circuit diagram of a contactor according to one embodiment;

[0023] Figure 2 The circuit diagram for starting the contactor is shown in one embodiment.

[0024] Figure 3 A circuit diagram of a contactor according to an embodiment;

[0025] Figure 4 This is an assembly diagram of a contactor circuit diagram according to one embodiment.

[0026] Explanation of reference numerals in the attached figures:

[0027] KF1, First position switch; KF2, Second position switch; AD, Rectifier module; K1, First coil; K2, Second coil; D1, First diode; D2, Second diode; DTX, Moving iron core; JTX, Stationary iron core; TH, Reset spring; DCT, Normally open contact; CFT, Trigger head. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0029] It should be noted that the terms "first," "second," etc., used in this application can be used to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish the first element from the second element. The terms "comprising" and "having," and any variations thereof, used in this application, are intended to cover non-exclusive inclusion. The term "multiple" used in this application refers to two or more. The term "and / or" used in this application refers to one of the embodiments, or any combination of multiple embodiments.

[0030] Combination Figures 1 to 4 As shown, Figure 1 A circuit diagram of a contactor according to one embodiment; Figure 2 The circuit diagram for starting the contactor is shown in one embodiment. Figure 3 A circuit diagram of a contactor according to an embodiment; Figure 4 This is an assembly diagram of a contactor circuit diagram according to one embodiment.

[0031] The contactor provided in this application includes: a rectifier module AD, an electromagnetic module, and a conversion module, wherein the rectifier module AD is used to perform full-wave rectification on the input of the contactor during startup and half-wave rectification on the input of the contactor during holding.

[0032] The electromagnetic module includes at least two coils. When the contactor starts, both coils serve as starting windings. When the contactor is in hold, a portion of the two coils serves as a first holding winding, while the other portion, together with the pulsating DC obtained by half-wave rectification, generates an inductive reactance as a step-down component and also serves as a second holding winding.

[0033] The conversion module is connected to the rectifier module AD. When starting up, the conversion module outputs the starting current of the full-wave rectified rectifier module AD to the electromagnetic module. When holding, the conversion module outputs the pulsating DC of the half-wave rectified rectifier module AD as the holding current to the electromagnetic module.

[0034] The electromagnetic module includes a moving iron core DTX and a stationary iron core JTX. The stationary iron core JTX includes at least two coils. During startup, both coils act as startup windings, causing the moving iron core DTX of the contactor to move towards the stationary iron core JTX. When the distance between the moving iron core DTX and the stationary iron core JTX is less than a distance threshold, the first position switch KF1 and the second position switch KF2 open sequentially, and the rectifier module AD switches to half-wave rectification. Holding current flows through the coils, keeping the moving iron core DTX and the stationary iron core JTX of the contactor in an attracted state. At least two coils combine to form a startup winding when the electromagnet starts. During holding, one part of the coil (the first coil K1, which acts as the main holding winding) primarily provides the holding attraction force for the electromagnet, while the other part of the coil (the second coil K2, which acts as the secondary holding winding) not only provides the holding attraction force but also functions as a reactor as a voltage reduction and current limiting device.

[0035] In the above embodiments, a half-wave rectified current is combined with a portion of the winding of the electromagnetic module, so that the winding acts as a holding winding and a step-down current limiting element when held, thereby omitting the step-down component and eliminating the problem of repeated start-stop of the contactor due to the failure of the step-down component.

[0036] In one alternative embodiment, at least two coils are obtained by tapping the center of a coil, and the number of turns on both sides of the tap is equal or unequal, and the magnitudes of the starting current and holding current are adjusted based on the number of turns on both sides of the tap.

[0037] In one alternative embodiment, at least two coils are independent coils connected in series, the number of turns of each independent coil may be equal or unequal, and the magnitude of the starting current and holding current is adjusted based on the number of turns of each independent coil.

[0038] The electromagnetic module's coil is a coil with a center tap, and the number of turns on both sides of the tap can be equal or unequal. By adjusting the number of turns on both sides of the tap, the magnitude of the starting current and the holding current can be adjusted, thereby adjusting the appropriate holding force of the electromagnet. The electromagnetic module's coil can also be two coils connected in series, and the number of turns of the two coils can be equal or unequal. By adjusting the number of turns of the two coils, the magnitude of the starting current and the holding current can be adjusted, thereby adjusting the appropriate starting and holding force of the electromagnet.

[0039] In one optional embodiment, the conversion module includes a first position switch KF1 and a second position switch KF2; the first terminal of the rectifier module AD is connected to the first terminal of the external AC power, the second terminal is connected to the first terminal of the electromagnetic module, the third terminal is connected to the second terminal of the first position switch KF1, and the fourth terminal is connected to the first terminal of the second position switch KF2; the first terminal of the first position switch KF1 is connected to the second terminal of the external AC power, and the second terminal of the second position switch KF2 is connected to the third terminal of the electromagnetic module; when the contactor starts, the first position switch KF1 and the second position switch KF2 are closed, the rectifier module AD performs full-wave rectification to obtain the starting current, and outputs the starting current to the electromagnetic module; when the distance between the moving iron core DTX and the stationary iron core JTX in the electromagnetic module is less than the distance threshold, the first position switch KF1 and the second position switch KF2 are opened successively, and the rectifier module AD switches to half-wave rectified pulsating DC as the holding current output to the electromagnetic module.

[0040] In one alternative embodiment, the contactor further includes a first diode D1, the positive terminal of which is connected to the third terminal of the electromagnetic module, and the negative terminal of which is connected to the second terminal of the external AC power supply.

[0041] In one alternative embodiment, the contactor further includes a second diode D2, the negative terminal of which is connected to a first terminal of the electromagnetic module, and the positive terminal of which is connected to a second terminal of the electromagnetic module, wherein the second terminal of the electromagnetic module is a tap or connection point of at least two coils.

[0042] Among them, the combination Figures 1 to 4As shown, the contactor includes: a rectifier module AD, with its first terminal connected to an external AC power source; a first position switch KF1, with its first terminal connected to the second terminal of the external AC power source, and its second terminal connected to the second terminal of the rectifier module AD; a second position switch KF2, with its first terminal connected to the fourth terminal (negative V-) of the rectifier module AD, and its second terminal connected to the second terminal of the second coil K2; a first coil K1, with its first terminal connected to the third terminal (V+) of the rectifier module AD, and its second terminal connected to the first terminal of the second coil K2; a second coil K2, with its first terminal connected to the second terminal of the second coil K2, and its second terminal connected to the second terminal of the second position switch KF2; and a first diode D1, with its negative terminal connected to the first terminal of the first position switch KF1, and its positive terminal connected to the second position switch KF2. The second terminal of position switch KF2 is connected; the negative terminal of the second diode D2 is connected to the first terminal of the first coil K1, and the positive terminal is connected to the second terminal of the first coil K1; when the contactor starts, the first position switch KF1 and the second position switch KF2 are closed, and the starting current flows through the first coil K1 and the second coil K2, causing the moving iron core DTX of the contactor to move towards the stationary iron core JTX; when the distance between the moving iron core DTX and the stationary iron core JTX is less than the distance threshold, the first position switch KF1 and the second position switch KF2 are opened one after the other, the rectifier module AD is switched to half-wave rectification, and the holding current flows through the first coil K1 and the second coil K2, so that the moving iron core DTX and the stationary iron core JTX of the contactor remain in the attracted state.

[0043] In one optional embodiment, the contactor further includes a trigger head CFT, which moves with the moving iron core DTX of the electromagnetic module. During the movement of the moving iron core DTX toward the stationary iron core JTX of the electromagnetic module, the first position switch KF1 and the second position switch KF2 are sequentially opened by the trigger head CFT.

[0044] The contactor also includes a reset spring TH and a normally open contact DCT.

[0045] In one alternative embodiment, the rectifier module AD is a bridge rectifier module AD.

[0046] In one alternative embodiment, the electromagnetic module includes two coils.

[0047] The rectified current is a bridge rectified current. It is full-wave rectified during startup and half-wave rectified during maintenance.

[0048] The trigger head CFT moves with the moving iron core DTX. During the process of the moving iron core DTX moving towards the stationary iron core JTX, the first position switch KF1 and the second position switch KF2 are opened by the trigger head CFT.

[0049] The contactor also includes a first position switch KF1 and a second position switch KF2. The first position switch KF1 and the second position switch KF2 can be adjusted relative to the position of the trigger head CFT to make the second position switch KF2 open sequentially.

[0050] In this embodiment, the contactor includes only one tapped moving iron core DTX coil (first coil K1 and second coil K2), which serves as both the pull-in coil and the holding coil. A freewheeling diode (second diode D2) is connected across the first coil K1, while no freewheeling component is connected across the second coil K2. Therefore, the second coil K2 acts as a reactance-based voltage-reducing element, omitting the voltage-reducing component. This embodiment uses the first coil K1 and the second coil K2 as examples; other embodiments may describe at least a portion of two coils and another portion thereof. One portion may be the first coil K1, and the other portion may be the second coil K2.

[0051] In this application, when the contactor is started, the position switch is closed, and a starting current flows through the moving iron core DTX coil (first coil K1 and second coil K2), causing the moving iron core DTX to move downward under the action of electromagnetic attraction, that is, the moving iron core DTX of the contactor moves towards the stationary iron core JTX. When the distance between the moving iron core DTX and the stationary iron core JTX is less than the distance threshold, the first position switch KF1 and the second position switch KF2 are opened in sequence. Then, through rectification by the rectifier module AD, a holding current flows through the moving iron core DTX coil (first coil K1 and second coil K2), which is sufficient to keep the moving iron core DTX in the energized position, so that the moving iron core DTX and the stationary iron core JTX of the contactor remain in the energized state.

[0052] In this embodiment, after the control power supply is connected, the entire control circuit is powered on and operates normally. The rectifier module AD provides rectified voltage to the moving iron core DTX coil, and the moving iron core DTX also moves downward under the action of electromagnetic attraction. At this time, the current is a full-wave rectified current. When the moving iron core DTX runs to the first position switch KF1 and the second position switch KF2, it opens the first position switch KF1 and the second position switch KF2. At this time, the holding current becomes a half-wave rectified current. In this way, the pull-in coil and the holding coil share one, with high voltage and high current for pull-in and low voltage and low current for holding. This simplifies the process, saves costs, reduces power consumption, eliminates the risk of holding coil failure, and improves product reliability.

[0053] This application also provides an electrical device including the contactor in any of the above embodiments.

[0054] The aforementioned contactors and electrical equipment use only a few components such as rectifier modules (AD), position switches, moving iron core (DTX) coils, and diodes. Their structure is simple and easy to miniaturize. Moreover, all of these components have high reliability, which greatly increases the lifespan of this type of contactor, saves society a lot of raw material waste, and reduces long-term operating costs.

[0055] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this application.

[0056] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. A contactor, characterized in that, The contactor includes: The rectifier module is used to perform full-wave rectification on the input of the contactor during startup and half-wave rectification on the input of the contactor during holding. The electromagnetic module includes at least two coils. When the contactor is started, all two coils serve as starting windings. When the contactor is held, a portion of the at least two coils serves as a first holding winding, and another portion, together with the pulsating DC obtained by half-wave rectification, generates an inductive reactance as a step-down component and also serves as a second holding winding. A conversion module is connected to the rectifier module. The conversion module is used to output the full-wave rectified startup current of the rectifier module to the electromagnetic module when starting up, and to switch the rectifier module to half-wave rectification to obtain half-wave pulsating DC as the holding current output to the electromagnetic module when holding.

2. The contactor according to claim 1, characterized in that, The at least two coils are obtained by tapping the middle of a coil, and the number of turns on both sides of the tap is equal or unequal, and the magnitudes of the starting current and the holding current are adjusted based on the number of turns on both sides of the tap.

3. The contactor according to claim 1, characterized in that, The at least two coils are independent coils, each of the independent coils is connected in series, and the number of turns of each of the independent coils may be equal or unequal. The magnitudes of the starting current and the holding current are adjusted based on the number of turns of each of the independent coils.

4. The contactor according to claim 1, characterized in that, The conversion module includes a first position switch and a second position switch; The first terminal of the rectifier module is connected to the first terminal of the external AC power supply, the second terminal is connected to the first terminal of the electromagnetic module, the third terminal is connected to the second terminal of the first position switch, and the fourth terminal is connected to the first terminal of the second position switch; the first terminal of the first position switch is connected to the second terminal of the external AC power supply, and the second terminal of the second position switch is connected to the third terminal of the electromagnetic module. When the contactor is started, the first position switch and the second position switch are closed, the rectifier module performs full-wave rectification to obtain the starting current, and outputs the starting current to the electromagnetic module; When the distance between the moving iron core and the stationary iron core in the electromagnetic module is less than a distance threshold, the first position switch and the second position switch are opened in sequence, and the rectifier module switches to half-wave rectification to obtain pulsating DC as a holding current output to the electromagnetic module.

5. The contactor according to any one of claims 1 to 4, characterized in that, The contactor also includes a first diode, the positive terminal of which is connected to the third terminal of the electromagnetic module, and the negative terminal is connected to the second terminal of the external AC power supply.

6. The contactor according to any one of claims 1 to 4, characterized in that, The contactor also includes a second diode, the negative terminal of which is connected to the first terminal of the electromagnetic module and the positive terminal of which is connected to the second terminal of the electromagnetic module. By recycling the electromagnetic energy generated by the pulsating DC current flowing through K1 and continuing through the second diode, the continuity of the electromagnet's attraction force when the half-wave pulsating DC current crosses zero is ensured. The second terminal of the electromagnetic module is the tap or connection point of the at least two coils.

7. The contactor according to any one of claims 1 to 4, characterized in that, The conversion module includes a first position switch and a second position switch; The contactor further includes a trigger head, which moves with the moving iron core of the electromagnetic module. During the movement of the moving iron core toward the stationary iron core of the electromagnetic module, the first position switch and the second position switch are sequentially opened by the trigger head.

8. The contactor according to any one of claims 1 to 4, characterized in that, The rectifier module is a bridge rectifier circuit.

9. The contactor according to any one of claims 1 to 4, characterized in that, The electromagnetic module includes two coils.

10. An electrical device, characterized in that, Includes the contactor as described in any one of claims 1 to 9.

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