Environment-friendly energy-saving alternating current contactor and electrical equipment

Abstract

The utility model relates to an environment-friendly energy-saving alternating current contactor and electrical equipment. The environment-friendly energy-saving AC contactor comprises a first rectification filter circuit, a second rectification filter circuit, a voltage reduction circuit, a first position switch, a second position switch, a voltage stabilization module and a coil module. When the alternating current contactor is started, the first position switch and the second position switch are in a closed state, and the alternating current provides a first starting current for the coil module through the first rectification filter circuit. The alternating current passes through the second rectifying and filtering circuit and the step-down circuit to charge the voltage stabilizing module so as to store energy; when the movable iron core of the coil module moves to the position where the distance between the movable iron core and the static iron core is smaller than a distance threshold value, the first position switch and the second position switch are in an on state, and the voltage stabilizing module releases energy and provides holding current for the coil module. The AC contactor is simple in structure and low in cost.

Description

Technical Field

[0001] The present application relates to the field of electrical technology, and in particular to an environmentally friendly and energy-saving AC contactor and electrical equipment. Background Art

[0002] With the vigorous development of the automation industry, artificial intelligence industry, smart sensors, computer technology, control technology, and electronic technology, the role of control appliances has become increasingly important and their uses have become increasingly widespread. There are many types of control appliances, such as AC contactors and DC contactors, which can be used to frequently connect or disconnect various terminal appliances over long distances. Control of common daily life equipment such as motors, transformers, and lighting. It covers a wide range of fields and plays an important role in agriculture, industry, transportation, life, and production, and in people's lives and the development of social and economic benefits.

[0003] At present, both AC contactors and DC contactors are widely used in various industries. However, they are widely used and consume a lot of electricity in long-term operation. In order to meet the green development of the national economy, my country will implement the new version (GB 21518-2022, AC contactor energy efficiency limit values ​​and energy efficiency grades) from January 1, 2024.

[0004] However, so far, the products launched in the field of energy-saving technology of AC contactors in my country have good energy-saving indicators and their performances are also different. For example, China Patent No. CN1107963C (mechanical self-locking AC contactor) uses mechanical self-locking and electromagnet unlocking to lock the contacts of the AC contactor in a closed state to achieve energy saving. Its disadvantages are complex structure, large product modification range, high modification cost, and failure to automatically disconnect when the power grid suddenly fails, which poses certain safety problems. Similarly, China Patent No. ZL200820302979.8 (AC contactor energy-saving device) uses DC high-voltage start-up. The principle of DC low-voltage operation achieves energy saving. Its disadvantages are high cost, easy aging of electronic components, and not suitable for use in high temperature and high humidity environments. In China Patent No. 201420101284.9 (an energy-saving AC contactor), one iron core is permanent magnet. The other iron core is soft magnetic and is wound with a coil that generates reverse magnetic flux. Permanent magnets are used to lock the contacts of the contactor, keeping them in a closed state to achieve energy saving. When the contactor needs to be restored to its initial state, the coil in the soft iron core is energized to generate reverse magnetic flux to repel the permanent magnet, causing it to return to its original position under the action of the reset spring. The disadvantages are that permanent magnets are easy to demagnetize, soft iron is easy to generate residual magnetism, the electronic circuit is expensive, and if the release circuit fails, there will be safety issues.

[0005] In conclusion, there is an urgent need for a contactor with a simple structure and low cost. Utility Model Content

[0006] Based on this, it is necessary to provide an environmentally friendly and energy-saving AC contactor and electrical equipment with a simple structure and low cost in order to solve the above technical problems.

[0007] In a first aspect, the present application provides an environmentally friendly and energy-saving AC contactor, the AC contactor comprising:

[0008] A first rectifier and filter circuit, wherein a first terminal and a second terminal are externally connected to an alternating current;

[0009] A second rectifying and filtering circuit, a first end of which is externally connected to an alternating current;

[0010] A step-down circuit, a first end of which is connected to a second end of the second rectifying and filtering circuit, and a second end of which is externally connected to an alternating current;

[0011] A first position switch, a first end of which is connected to a third end of the first rectifying and filtering circuit;

[0012] A second position switch, a first end of which is connected to a fourth end of the first rectifying and filtering circuit;

[0013] A voltage stabilizing module, a first end of which is connected to a third end of the second rectifying and filtering circuit;

[0014] A coil module, a first end connected to the second end of the first position switch, a second end connected to the second end of the second position switch, a third end connected to the second end of the voltage stabilizing module, and a fourth end connected to the third end of the voltage stabilizing module;

[0015] Wherein, when the AC contactor is started, the first position switch and the second position switch are in a closed state, the AC power provides a first starting current for the coil module through the first rectifier and filter circuit, and the AC power charges the voltage stabilizing module through the second rectifier and filter circuit and the step-down circuit to store energy; when the moving iron core of the coil module moves to a distance less than a distance threshold from the static iron core, the first position switch and the second position switch are in an open state, and the voltage stabilizing module releases energy to provide a holding current for the coil module.

[0016] In one embodiment, the coil module comprises:

[0017] At least two coils;

[0018] At least one first diode, each of the first diodes corresponds to one of the coils, the first coil is connected to the second end of the first position switch through the first diode, and the last coil is connected to the second end of the second position switch through the second diode; if there are remaining coils, each of the remaining coils corresponds to two of the first diodes, and is respectively connected to the third end and the fourth end of the first rectifier and filter circuit through the two first diodes;

[0019] When the first position switch and the second position switch are closed, the voltage output by the first rectifier and filter circuit is greater than or equal to the conduction voltage of each of the first diodes, each of the first diodes is turned on, and each of the coils is connected in parallel; when the first position switch and the second position switch are opened, the voltage output by the first rectifier and filter circuit is less than the conduction voltage of each of the diodes, each of the first diodes is turned off, and each of the coils is connected in series.

[0020] In one embodiment, the coil module further includes:

[0021] at least two second diodes, each of the second diodes corresponds to two of the coils, and two ends of the first diode are respectively connected to different ends of two adjacent coils;

[0022] A third diode, wherein the reverse input end of the first diode of the first coil is connected to the second end of the voltage stabilizing module through the third diode.

[0023] In one embodiment, the coil module is an excitation winding, and the excitation winding is divided into at least two coil sections.

[0024] In one of the embodiments, a first resistor is further provided between the two ends of the alternating current.

[0025] In one embodiment, the voltage stabilizing module includes:

[0026] a second resistor, a first end of which is connected to a third end of the second rectifying and filtering circuit;

[0027] an energy storage device, a first end of which is connected to the second end of the second resistor, and a second end of which is connected to the fourth end of the second rectifier and filter circuit and the fourth end of the coil module;

[0028] A voltage regulator tube has a first end connected to the second end of the second resistor and the third end of the coil module, and a second end connected to the second end of the energy storage device.

[0029] In one embodiment, the energy storage device is a capacitor.

[0030] In one embodiment, the step-down circuit includes any one of the following circuits:

[0031] First circuit: a forward diode and a surge protection and voltage drop resistor in series;

[0032] Second circuit: a reverse diode and a surge protection and voltage drop resistor in series;

[0033] The third circuit: at least one capacitor and at least one discharge resistor are connected in parallel;

[0034] Fourth circuit: the first circuit and the second circuit are connected in parallel and then connected in series with the third circuit.

[0035] In one embodiment, the first rectifying and filtering circuit and the second rectifying and filtering circuit are bridge rectifier circuits.

[0036] In a second aspect, the present application also provides an electrical device, comprising the AC contactor described in any one of the above embodiments.

[0037] The above-mentioned environmentally friendly and energy-saving AC contactor and electrical equipment, when the AC contactor is started, the first position switch and the second position switch are in a closed state, the AC power passes through the first rectifier and filter circuit to provide a first starting current for the coil module, and the AC power passes through the second rectifier and filter circuit and the step-down circuit to charge the voltage stabilizing module for energy storage; when the moving iron core of the coil module moves to a distance less than the distance threshold from the static iron core, the first position switch and the second position switch are in an open state, the voltage stabilizing module releases energy, and provides a holding current for the coil module, thereby reducing components, simplifying the structure and miniaturizing it, and all of these components have the characteristics of high reliability operation. At the same time, because the life of this type of contactor is greatly increased, it also saves a lot of raw material loss for society and reduces costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 An assembly circuit diagram of an environmentally friendly and energy-saving AC contactor in one embodiment;

[0039] Figure 2 A starting circuit diagram of an environmentally friendly and energy-saving AC contactor according to an embodiment;

[0040] Figure 3 for Figure 1 A holding current diagram of the environmentally friendly and energy-saving contactor in the illustrated embodiment;

[0041] Figure 4 for Figure 1 An assembly diagram of the environmentally friendly and energy-saving AC contactor in the illustrated embodiment;

[0042] Figure 5 FIG. 4 is a circuit diagram of a second rectifying and filtering circuit in an embodiment.

[0043] Among them, a first rectifier and filter circuit 100, a second rectifier and filter circuit 101, a coil module 200, a voltage stabilizing module 400, a voltage step-down module 300, a first position switch KF1, a second position switch KF2, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a third diode D3, an energy storage device C3, a voltage stabilizing tube D10, a fourth diode D4, a fifth diode D5, a first capacitor C1, a second capacitor C2, a first diode D11, a first diode D121, a first diode D122, a first diode D132, a second diode D212, a second diode D223, a first coil K1, a second coil K2, a third coil K3, a moving iron core 600, a static iron core 700, a reset spring 800, a normally open contact 900, and a trigger head 910. DETAILED DESCRIPTION

[0044] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.

[0045] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0046] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0047] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0048] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0049] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0050] The present application provides an AC contactor, combined with Figures 1 to 5 As shown, Figure 1 An assembly circuit diagram of an environmentally friendly and energy-saving AC contactor in one embodiment; Figure 2 A starting circuit diagram of an environmentally friendly and energy-saving AC contactor according to an embodiment; Figure 3 for Figure 1 A holding current diagram of the environmentally friendly and energy-saving contactor in the illustrated embodiment; Figure 4 for Figure 1 An assembly diagram of the environmentally friendly and energy-saving AC contactor in the illustrated embodiment; Figure 5 FIG. 4 is a circuit diagram of a second rectifying and filtering circuit in an embodiment.

[0051] The AC contactor comprises: a first rectifier and filter circuit 100, a second rectifier and filter circuit 101, a step-down circuit 300, a first position switch KF1, a second position switch KF2, a voltage stabilizing module 400 and a coil module 200; wherein the first end and the second end of the first rectifier and filter circuit 100 are externally connected to AC power; the first end of the second rectifier and filter circuit 101 is externally connected to AC power; the first end of the step-down circuit 300 is connected to the second end of the second rectifier and filter circuit 101, and the second end is externally connected to AC power; the first position switch K The first end of F1 is connected to the third end of the first rectifier and filter circuit 100; the first end of the second position switch KF2 is connected to the fourth end of the first rectifier and filter circuit 100; the first end of the voltage stabilizing module 400 is connected to the third end of the second rectifier and filter circuit 101; the first end of the coil module 200 is connected to the second end of the first position switch KF1, the second end is connected to the second end of the second position switch KF2, the third end is connected to the second end of the voltage stabilizing module 400, and the fourth end is connected to the third end of the voltage stabilizing module 400.

[0052] Among them, when the AC contactor is started, the first position switch KF1 and the second position switch KF2 are in a closed state, and the AC power passes through the first rectifier and filter circuit 100 to provide a first starting current for the coil module 200, and the AC power passes through the second rectifier and filter circuit 101 and the step-down circuit 300 to charge the voltage stabilizing module 400 for energy storage; when the moving iron core 600 of the coil module 200 moves to a distance less than the distance threshold from the static iron core 700, the first position switch KF1 and the second position switch KF2 are in an open state, and the voltage stabilizing module 400 releases energy to provide a holding current for the coil module 200.

[0053] The above-mentioned environmentally friendly and energy-saving AC contactor, when the AC contactor is started, the first position switch KF1 and the second position switch KF2 are in a closed state, the AC power passes through the first rectifier and filter circuit 100 to provide a first starting current for the coil module 200, and the AC power passes through the second rectifier and filter circuit 101 and the step-down circuit 300 to charge the voltage stabilizing module 400 for energy storage; when the moving iron core 600 of the coil module 200 moves to a distance less than the distance threshold from the static iron core 700, the first position switch KF1 and the second position switch KF2 are in an open state, the voltage stabilizing module 400 releases energy, and provides a holding current for the coil module 200, thereby reducing components, simplifying the structure and miniaturizing it, and all of these components have the characteristics of high reliability operation. At the same time, because the life of this type of contactor is greatly increased, it also saves a lot of raw material loss for society and reduces costs.

[0054] In one optional embodiment, the coil module 200 includes: at least two coils and at least two first diodes. Each first diode corresponds to a coil, the first coil K1 is connected to the second end of the first position switch KF1 through the first diode, and the last coil is connected to the second end of the second position switch KF2 through the second diode; if there are remaining coils, each of the remaining coils corresponds to two first diodes, and is respectively connected to the third end and the fourth end of the first rectifier filter circuit 100 through the two first diodes.

[0055] When the first position switch KF1 and the second position switch KF2 are closed, the voltage output by the first rectifier and filter circuit 100 is greater than or equal to the conduction voltage of each first diode, each first diode is turned on, and each coil is connected in parallel; when the first position switch KF1 and the second position switch KF2 are opened, the voltage output by the first rectifier and filter circuit 100 is less than the conduction voltage of each diode, each first diode is turned off, and each coil is connected in series.

[0056] Specifically, the coil module 200 may include at least two coils (K1, K2, K3----Kn). In this embodiment, the coil module 200 may include only two coils or multiple coils. However, for each additional coil, three diodes need to be added, including two first diodes connected to the two ends of the coil respectively, and a second diode connecting the coil to the adjacent coil. In one optional embodiment, the coil module 200 is an excitation winding, and the excitation winding is divided into at least two sections of coils to obtain multiple coils.

[0057] In this embodiment, the same excitation winding is divided into 2 to N sections. This circuit can greatly increase the starting attraction of the electromagnet, and automatically switch to an energy-saving working state after the start-up is completed. This solution can make the electromagnet or contactor start quickly or the starting force several times greater.

[0058] In one of the optional embodiments, the distance threshold is 1.5 mm, wherein the first position switch KF1 and the second position switch KF2 are triggered to open by the electromagnet moving iron core 600 when the air gap between the moving iron core 600 and the static iron core 700 is ≤1.5 mm.

[0059] When the contactor is started, the first position switch KF1 and the second position switch KF2 are closed, each coil is in a parallel state, and a starting current flows through the coil, so that the moving iron core 600 of the contactor moves toward the static iron core 700, and the filter energy storage device C3 in the voltage stabilizing module 400 stores energy; when the moving iron core 600 moves to a distance less than the distance threshold from the static iron core 700, the first position switch KF1 and the second position switch KF2 are opened, the voltage between the first end and the second end of the coil module 200 disappears, and the coil module 200 begins to be powered by the voltage at the third end and the fourth end of the coil module 200. The step-down circuit 300 reduces the voltage of the external alternating current, each coil is in a series state, the filter energy storage device C3 in the voltage stabilizing module 400 releases energy, and a holding current flows through the coil, so that the moving iron core 600 and the static iron core 700 of the contactor remain in the attracted state.

[0060] In the above embodiment, only the first rectifier filter circuit 100, the first rectifier filter circuit 100, the step-down circuit 300, the first position switch KF1, the second position switch KF2, the coil module 200 and the voltage stabilizing module 400 are applied, thereby reducing the components, the structure is simple and miniaturized, and all of these components have high reliability operation characteristics. At the same time, because the life of this type of contactor is greatly increased, it also saves a lot of raw material loss for the society and reduces costs. The pull-in coil and the holding coil share a group, high voltage and high current pull-in, low voltage and low current hold, simplifying the process, saving costs, reducing power consumption, reducing the risk of holding coil failure, and improving product reliability.

[0061] In one of the optional embodiments, the coil module 200 also includes: at least two second diodes and a third diode D3; wherein each second diode corresponds to two coils, and the two ends of the first diode are respectively connected to different ends of two adjacent coils; the reverse input end of the first diode of the first coil K1 is connected to the second end of the voltage regulator module 400 through the third diode D3.

[0062] When the first position switch KF1 and the second position switch KF2 are closed, the second diodes and the third diode D3 are turned off, and the coils are connected in parallel; when the first position switch KF1 and the second position switch KF2 are opened, the second diodes and the third diode D3 are turned on, and the coils are connected in series.

[0063] Combination Figure 1As shown, a second diode is included between every two adjacent coils, and the positive electrode of the second diode is connected to the second end of the previous coil, and the negative electrode is connected to the first end of the next coil, wherein the first end of each coil is an end directly or indirectly (through the first diode) connected to the second end of the first position switch KF1, and the second end is an end directly or indirectly (through the first diode) connected to the second end of the second position switch KF2; at the same time, the first end of the first coil K1 is also connected to the second end of the voltage stabilizing module 400 through the third diode D3, and the second end of the last coil is directly connected to the third end of the voltage stabilizing module 400.

[0064] In one of the optional embodiments, by changing the voltage at the input end of the coil module 200, each diode connected to the coil is controlled to be turned on or off, so as to achieve the change of the parallel state and the series state of each coil.

[0065] In one of the optional embodiments, the cathode of the first diode is connected to the first end of the first coil K1 and the corresponding cathode of the third diode D3, the second end of the first coil K1 is connected to the second end of the second position switch KF2, and the anode of the first diode is connected to the second end of the first position switch KF1; the last coil is connected to the second end of the second position switch KF2 through another first diode, and the two ends of the remaining coils are respectively connected to the cathode of the first diode and the anode of another second diode, and the anode of the third diode D3 is connected to the second end of the voltage stabilizing module 400, and the two adjacent coils are connected through a second diode, the anode of the second diode is connected to the second end of the previous coil, and the cathode of the second diode is connected to the first end of the next coil.

[0066] Specific combination Figure 1 and Figure 2As shown, the coil loop includes a first diode D11, a first diode D121, a first diode D122 and a first diode D132, a second diode D212, a second diode D223 and a third diode D3D3; wherein the first end of the first coil K1 is connected to the cathode of the first diode D11 and the cathode of the third diode D3D3, the anode of the first diode D11 is connected to the second end of the first position switch KF1; the second end of the first coil K1 is connected to the anode of the second diode D212 and the second end of the second position switch KF2; the first end of the second coil K2 is connected to the first diode The cathode of the tube D121 and the cathode of the second diode D212 are connected, the anode of the first diode D11 is connected to the second end of the first position switch KF1, the second end of the second coil K2 is connected to the anode of the first diode D122 and the anode of the second diode D223, the cathode of the first diode D122 is connected to the second end of the second position switch KF2 and the cathode of the first diode D132, the second end of the third coil K3 is connected to the anode of the first diode D132, and the first end of the third coil K3 is connected to the cathode of the second diode D223 and the second end of the first position switch KF1.

[0067] When the AC contactor is started, the first position switch KF1 and the second position switch KF2 are closed, the voltage across the first end and the second end of the coil module 200 is greater than the voltage across the third end and the fourth end of the coil module 200, the first diode D11, the first diode D121, the first diode D122 and D132 are turned on, the second diode D212, the second diode D223 and the third diode D3D3 are turned off, the coils become connected in parallel, and the starting current flows through the coils, so that the moving iron core 600 of the AC contactor moves toward the static iron core 700, and the filter energy storage device C3 in the second rectifier filter circuit 101 stores energy.

[0068] When the moving iron core 600 moves to a distance less than the distance threshold from the static iron core 700, the first position switch KF1 and the second position switch KF2 are turned on, the voltage across the first and second ends of the coil module 200 is 0, which is less than the voltage across the third and fourth ends of the coil module 200, and each of the first diodes D11, D121, D122, and D132 is turned off, and the second diode D212, D223, and the third diode D3D3 are turned on, and each coil is switched from parallel to series, and a holding current flows through the coil, so that the moving iron core 600 and the static iron core 700 of the contactor remain in the attracted state. For this reason, the coil module 200 in this application is both an attracting coil and a holding coil.

[0069] In the present application, when the contactor is started, the first position switch KF1 and the second position switch KF2 are closed, and the filter energy storage device C3 in the voltage stabilizing module 400 is charged and stored to provide high voltage for the coil module 200. The first rectifier filter circuit 100 provides a starting current in the coil module 200, so that the moving iron core 600 also moves downward under the action of electromagnetic attraction, that is, the moving iron core 600 of the contactor moves toward the static iron core 700, and the second rectifier filter circuit 101 stores energy in the filter energy storage device C3 in the voltage stabilizing component; when the distance between the moving iron core 600 and the static iron core 700 is less than the distance threshold, the first position switch KF1 and the second position switch KF2 are opened, and the step-down circuit 300 will The voltage of the external AC power is reduced, that is, after being stepped down by the step-down circuit 300, the circuit changes from a high voltage to a low voltage, and then rectified by the second rectifier circuit, it becomes DC and continues to supply power to the coil module 200 through the voltage stabilizing component. The magnetic force generated by the coil module 200 may be insufficient to continue to move forward or to keep the moving iron core 600 in the attracted position due to the low voltage. However, at this time, the filter energy storage device C3 releases energy, and a starting current flows through the coil module 200, which is sufficient to maintain the moving iron core 600 in the attracted position, so that the moving iron core 600 and the static iron core 700 of the contactor reach the attracted state, and then a holding current flows through the coil module 200 to maintain the contactor in the attracted state.

[0070] In one optional embodiment, a first resistor R1 is further provided between the two ends of the alternating current, and the first resistor R1 is a varistor.

[0071] In one of the optional embodiments, the voltage stabilizing module 400 includes: a second resistor R2, an energy storage device C3 and a voltage stabilizing diode D10, wherein the first end of the second resistor R2 is connected to the third end of the second rectifier and filter circuit 101; the first end of the energy storage device C3 is connected to the second end of the second resistor R2, and the second end is connected to the fourth end of the second rectifier and filter circuit 101 and the fourth end of the coil module 200; the first end of the voltage stabilizing diode D10 is connected to the second end of the second resistor R2 and the third end of the coil module 200, and the second end is connected to the second end of the energy storage device C3.

[0072] Optionally, the energy storage device C3 is a capacitor.

[0073] The voltage stabilizing module 400 can be a slow-charging and fast-discharging energy storage circuit; when a large-capacity capacitor is used for energy storage in the voltage stabilizing module 400, it will not cause excessive starting current, causing overcurrent in related components, such as the rectifier bridge, the first position switch KF1 and the second position switch KF2 in this circuit, nor will it cause the starting current to be shunted by a large energy storage capacitor and extend the starting time.

[0074] In this embodiment, after the control power supply is connected, the entire control circuit is powered and operates normally, the first rectifier and filter circuit 100 provides high voltage for the coil module 200, the moving iron core 600 also moves downward under the action of electromagnetic attraction, and the trigger head 910 moves with the moving iron core 600; when the moving iron core 600 moves to the first position switch KF1 and the second position switch KF2, the first position switch KF1 and the second position switch KF2 are turned on, the ground rectifier and filter circuit no longer supplies power to the coil module 200, but the second rectifier and filter circuit supplies power to the coil module 200, and the circuit is changed from high voltage to low voltage after being stepped down by the step-down circuit 300, and then rectified by the second rectifier and filter circuit 101, and then converted into DC and continued to supply power to the coil module 200 through the voltage stabilizing component. If the connection is not good at this time, the magnetic force generated by the coil module 200 may be insufficient to continue to move forward or keep the moving iron core 600 in the attracted position due to the low voltage. The filter and energy storage device C3 in this application will also supply power to the coil module 200, which is enough to make the coil module 200 run to the attraction and maintain the moving iron core 600 in the holding position. In this way, the attraction coil and the holding coil share a group, high voltage attraction, low voltage holding, which simplifies the process, saves costs, reduces power consumption, reduces the risk of failure of the holding coil, and improves the reliability of the product. When the reset spring 800 is reset later, it pulls the moving iron core 600 and the static iron core 700 apart, so that the normally open contact 900 is in an open state.

[0075] In one of the optional embodiments, the buck circuit 300 includes any one of the following circuits: a first circuit: a forward diode and a surge protection and voltage drop resistor are connected in series; a second circuit: a reverse diode and a surge protection and voltage drop resistor are connected in series; a third circuit: at least one capacitor and at least one discharge resistor are connected in parallel; a fourth circuit: the first circuit and the second circuit are connected in parallel and then connected in series with the third circuit.

[0076] Among them, it can be combined Figures 1 to 3 As shown, the buck circuit 300 can be obtained in various forms. Figure 1 and Figure 3Only one possible form is shown in the figure. In this embodiment, the buck circuit 300 includes a fourth diode D4, a fifth diode D5, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a first capacitor C1 and a second capacitor C2, wherein the anode of the fourth diode D4 and the cathode of the fifth diode D5 are connected to the alternating current, the cathode of the fourth diode D4 is connected to the first end of the third resistor R3, the anode of the fifth diode D5 is connected to the first end of the fourth resistor R4, the second end of the third resistor R3, the first end of the first capacitor C1, the first end of the fifth resistor R5, the second end of the fourth resistor R4 and the first end of the second capacitor C2 are connected, and the second end of the first capacitor C1, the second end of the fifth resistor R5 and the second end of the second capacitor C2 are connected to the second end of the second rectifier and filter circuit 101.

[0077] In one optional embodiment, the first rectifying and filtering circuit 100 and the second rectifying and filtering circuit 101 are bridge rectifying circuits.

[0078] The second rectifying and filtering circuit 101 may also be implemented as follows: Figure 5 The rectifier and filter circuit shown is not specifically limited here.

[0079] In one of the optional embodiments, the present application also provides an electrical device, which includes the AC contactor in any one of the above embodiments.

[0080] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described 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 specification.

[0081] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. An environmentally friendly and energy-saving AC contactor, characterized in that: The AC contactor comprises: A first rectifier and filter circuit, wherein a first terminal and a second terminal are externally connected to an alternating current; A second rectifying and filtering circuit, a first end of which is externally connected to an alternating current; A step-down circuit, a first end of which is connected to a second end of the second rectifying and filtering circuit, and a second end of which is externally connected to an alternating current; A first position switch, a first end of which is connected to a third end of the first rectifying and filtering circuit; A second position switch, a first end of which is connected to a fourth end of the first rectifying and filtering circuit; A voltage stabilizing module, a first end of which is connected to a third end of the second rectifying and filtering circuit; A coil module, a first end connected to the second end of the first position switch, a second end connected to the second end of the second position switch, a third end connected to the second end of the voltage stabilizing module, and a fourth end connected to the third end of the voltage stabilizing module; Wherein, when the AC contactor is started, the first position switch and the second position switch are in a closed state, the AC power provides a first starting current for the coil module through the first rectifier and filter circuit, and the AC power charges the voltage stabilizing module through the second rectifier and filter circuit and the step-down circuit to store energy; when the moving iron core of the coil module moves to a distance less than a distance threshold from the static iron core, the first position switch and the second position switch are in an open state, and the voltage stabilizing module releases energy to provide a holding current for the coil module.

2. The environmentally friendly and energy-saving AC contactor according to claim 1, characterized in that: The coil module comprises: At least two coils; At least one first diode, each of the first diodes corresponds to one of the coils, the first coil is connected to the second end of the first position switch through the first diode, and the last coil is connected to the second end of the second position switch through the second diode; if there are remaining coils, each of the remaining coils corresponds to two of the first diodes, and is respectively connected to the third end and the fourth end of the first rectifier and filter circuit through the two first diodes; When the first position switch and the second position switch are closed, the voltage output by the first rectifier and filter circuit is greater than or equal to the conduction voltage of each of the first diodes, each of the first diodes is turned on, and each of the coils is connected in parallel; when the first position switch and the second position switch are opened, the voltage output by the first rectifier and filter circuit is less than the conduction voltage of each of the diodes, each of the first diodes is turned off, and each of the coils is connected in series.

3. The environmentally friendly and energy-saving AC contactor according to claim 2 is characterized in that: The coil module further includes: at least two second diodes, each of the second diodes corresponds to two of the coils, and two ends of the first diode are respectively connected to different ends of two adjacent coils; a third diode, wherein the reverse input end of the first diode of the first coil is connected to the second end of the voltage stabilizing module through the third diode; When the first position switch and the second position switch are closed, the second diodes and the third diodes are cut off, and the coils are connected in parallel; when the first position switch and the second position switch are opened, the second diodes and the third diodes are turned on, and the coils are connected in series.

4. The environmentally friendly and energy-saving AC contactor according to claim 1, characterized in that: The coil module is an excitation winding, and the excitation winding is divided into at least two coil sections.

5. The environmentally friendly and energy-saving AC contactor according to claim 1, characterized in that: A first resistor is also provided between the two ends of the alternating current.

6. The environmentally friendly and energy-saving AC contactor according to claim 1, characterized in that: The voltage regulator module includes: a second resistor, a first end of which is connected to a third end of the second rectifying and filtering circuit; an energy storage device, a first end of which is connected to the second end of the second resistor, and a second end of which is connected to the fourth end of the second rectifier and filter circuit and the fourth end of the coil module; A voltage regulator tube, having a first end connected to the second end of the second resistor and the third end of the coil module, and a second end connected to the second end of the energy storage device.

7. The environmentally friendly and energy-saving AC contactor according to claim 6, characterized in that: The energy storage device is a capacitor.

8. The environmentally friendly and energy-saving AC contactor according to claim 1, characterized in that: The step-down circuit includes any one of the following circuits: First circuit: a forward diode and a surge protection and voltage drop resistor in series; Second circuit: a reverse diode and a surge protection and voltage drop resistor in series; The third circuit: at least one capacitor and at least one discharge resistor are connected in parallel; Fourth circuit: the first circuit and the second circuit are connected in parallel and then connected in series with the third circuit.

9. The environmentally friendly and energy-saving AC contactor according to claim 1, characterized in that: The first rectifying and filtering circuit and the second rectifying and filtering circuit are bridge rectifying circuits.

10. An electrical device, characterized in that: The invention comprises the environmentally friendly and energy-saving AC contactor as described in any one of claims 1 to 9.

Images