Low-energy-consumption contactor topology circuit

Abstract

The utility model discloses a low-energy-consumption contactor topology circuit, which belongs to the technical field of contactors, and comprises a main control switch Q1, the source electrode of the main control switch Q1 is grounded, and the main control switch Q1 is used for controlling the on and off of the contactor topology circuit; the first current suppression branch circuit is connected in series between the drain electrode of the main control switch Q1 and a power supply; and the second current suppression branch circuit is connected between the drain electrode of the main control switch Q1 and the power supply in series, is connected between the two ends of the first current suppression branch circuit in parallel, and is connected between the two ends of the first current suppression branch circuit in parallel. According to the topology circuit of the utility model, on the premise of ensuring normal functions, peak current generated at the switching moment of the switch can be effectively reduced through inductive reactance and inductance characteristics in the first current suppression branch and the second current suppression branch, so that the switching loss of the main control switch Q1 is reduced, i.e., the loss of other key parts of the contactor is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of contactors, and particularly relates to a low - energy - consumption contactor topology circuit. Background Art

[0002] A contactor consists of a coil, an iron core, contacts, and a frame. The working process of the contactor is divided into three stages: the closing stage, the holding stage, and the turning - off stage. Among them, in the closing stage, it is necessary to control the coil to generate a large current I1 to generate electromagnetic force to make the contactor contacts close. The selection of the current in this stage cannot be too large, because too large a current will lead to high losses of the contactor; in the holding stage, the coil current is controlled to decrease from the large current I1 and maintain at I2. Generally, I1 is about between 3*I2 and 20*I2. It is necessary to minimize I2 while ensuring reliable closing. The lower I2 is, the lower the power consumption of the contactor, the less the coil heats up, and the lower the temperature rise; in the turning - off stage, the control stops supplying current to the coil. At this time, the contactor actually consumes the coil current. The faster it is consumed, the faster the contacts separate, and the higher the stability, reliability, and safety of the contactor. Therefore, the effective control of the coil current in the contactor is the key factor for realizing the electric control of the contactor.

[0003] Ordinary contactors do not have a special current control circuit, resulting in large losses of the contactor. In related technologies, contactors with a dual - coil scheme are improved, that is, a low - impedance large - current coil is used during closing, and automatically switched to another high - impedance coil after closing to reduce losses. The dual - coil scheme increases the manufacturing cost of the contactor on the one hand. On the other hand, arcing will occur during coil switching, the contact separation time is long and the contact separation is slow during turning - off, there are potential safety hazards, and at the same time, due to long - term high - energy consumption, a large amount of resource waste is generated. Therefore, the dual - coil scheme still has the problem of high losses. Summary of the Utility Model

[0004] To solve the above - mentioned technical problems, an embodiment of the present application provides a low - energy - consumption contactor topology circuit.

[0005] According to one aspect of the embodiments of the present application, a low-power contactor topology circuit is provided. The low-power contactor topology circuit includes: a main control switch Q1, the source of the main control switch Q1 is grounded, and the main control switch Q1 is used to control the turn-off and turn-on of the contactor topology circuit; a first current suppression branch, the first current suppression branch is serially connected between the drain of the main control switch Q1 and the power supply; a second current suppression branch, the second current suppression branch is serially connected between the drain of the main control switch Q1 and the power supply, and is parallel to both ends of the first current suppression branch, and the second current suppression branch is a branch with inductive reactance characteristics; the first current suppression branch and the second current suppression branch are used to reduce the peak current at the moment of the conversion of the main control switch Q1 from the off state to the on state, thereby reducing the turn-on loss of the main control switch Q1.

[0006] In an embodiment of the present application, the second current suppression branch includes a second current suppression unit and a contactor coil KT. The second current suppression unit is serially connected to the contactor coil KT, and when the second current suppression unit is serially connected to the contactor coil KT, the serial connection positions can be exchanged.

[0007] In an embodiment of the present application, the second current suppression unit includes at least one second inductive reactance component L2.

[0008] In an embodiment of the present application, the second current suppression unit includes a second inductive reactance component L2; the second current suppression branch includes a second inductive reactance component L2 and the contactor coil KT, and the second inductive reactance component L2 is serially connected to the contactor coil KT. When the second inductive reactance component L2 is serially connected to the contactor coil KT, the serial connection positions can be exchanged.

[0009] In an embodiment of the present application, the circuit further includes a second main control switch Q3; one end of the second main control switch Q3 is connected to the power supply Vin, and the other end is serially connected to the second inductive reactance component L2 or the contactor coil KT.

[0010] In an embodiment of the present application, the first current suppression branch includes a freewheeling diode D1. In this embodiment, the first current suppression branch in the low-power contactor topology circuit only includes the freewheeling diode D1.

[0011] In an embodiment of the present application, the first current suppression branch includes a first current suppression unit and a freewheeling diode D1. The first current suppression unit is serially connected to the freewheeling diode D1, and when the first current suppression unit is serially connected to the freewheeling diode D1, the serial connection positions can be exchanged.

[0012] In one embodiment of the present application, the first current suppression unit includes at least one first inductive reactance component L1.

[0013] In one embodiment of the present application, the first current suppression branch includes one first inductive reactance component L1 and the freewheeling diode D1, and the first inductive reactance component L1 is connected in series with the freewheeling diode D1. When the first inductive reactance component L1 and the freewheeling diode D1 are connected in series, the series connection positions can be exchanged.

[0014] In one embodiment of the present application, the first current suppression branch includes a first current suppression unit, a freewheeling diode D1, a controllable fast turn-off switch tube Q2, and a voltage regulator component Z1. The first current suppression unit, the freewheeling diode D1, and the controllable fast turn-off switch tube Q2 are connected in series, and the voltage regulator component Z1 is connected in parallel across the controllable fast turn-off switch tube Q2.

[0015] In one embodiment of the present application, the first current suppression unit includes at least one first inductive reactance component L1.

[0016] In the technical solution provided by the embodiment of the present application, the above-mentioned low-energy consumption contactor topology circuit controls the turn-off and turn-on of the contactor topology circuit through the main control switch Q1, and reduces the peak current generated at the moment of the conversion of the main control switch Q1 from the off state to the on state through the first current suppression branch and the second current suppression branch, thereby reducing the turn-on loss of the main control switch Q1, that is, reducing the loss of other key parts of the contactor. Description of the Drawings

[0017] The drawings here are incorporated into the description and form a part of this description, showing embodiments consistent with the present application, and are used together with the description to explain the principles of the present application. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts. In the drawings:

[0018] Figure 1 is a traditional contactor topology circuit;

[0019] Figure 2 is another traditional contactor topology circuit

[0020] Figure 3 is a schematic structural diagram of a low-energy consumption contactor topology circuit shown in an exemplary embodiment of the present application;

[0021] Figure 4 is a schematic structural diagram of a low-energy consumption contactor topology circuit shown in another exemplary embodiment of the present application;

[0022] Figure 5 It is a schematic structural diagram of a low - energy - consumption contactor topology circuit shown in another exemplary embodiment of the present application;

[0023] Figure 6 It is a schematic structural diagram of a low - energy - consumption contactor topology circuit shown in another exemplary embodiment of the present application;

[0024] Figure 7 It is a schematic structural diagram of a low - energy - consumption contactor topology circuit shown in another exemplary embodiment of the present application;

[0025] Figure 8 It is a schematic structural diagram of a low - energy - consumption contactor topology circuit shown in another exemplary embodiment of the present application;

[0026] Figure 9 It is a schematic diagram for comparing the energy - consumption effects of the waveforms of nodes of a traditional topology circuit and the waveforms of nodes of the circuit of the present application in an embodiment of the present application.

[0027] Reference numerals in the drawings:

[0028] 10 - The first current suppression unit;

[0029] 20 - The second current suppression unit. Detailed implementation manners

[0030] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. The components of the embodiments of the present utility model usually described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present utility model provided in the accompanying drawings is not intended to limit the scope of the claimed present utility model, but merely represents the selected embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without making creative efforts fall within the scope of protection of the present utility model. It should be noted that similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. In the description of the embodiments of the present utility model, it should be noted that the orientation or positional relationship indicated by terms such as "upper", "inner", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the utility model product is usually placed during use. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present utility model. In the description of the present utility model, it should also be noted that unless otherwise clearly specified and limited, the terms "set", "install", "connected", "coupled" 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 directly connected, or indirectly connected through an intermediate medium, and it can be the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0031] According to the structural composition of the contactor and the three working stages (the closing stage, the holding stage, and the opening stage) during the operation of the contactor, it can be seen that the effective control of the coil current in the contactor is the key factor for realizing the electric control of the contactor.

[0032] In the related art, the traditional contactor has its coil directly connected to the power supply without a special current control circuit, resulting in very large losses and serious heating of the contactor. For example Figure 1 、 Figure 2As shown in the figure. Later, it evolved into a dual-coil scheme. The dual-coil scheme uses a low-impedance large-current coil during suction, and automatically switches to another high-impedance coil after suction to reduce losses. However, on the one hand, the dual-coil scheme increases the manufacturing cost of the contactor. On the other hand, due to the large fluctuation of the current in the coil in wide-voltage applications, relying solely on the internal resistance of the coil to limit power consumption cannot reduce power consumption, and there will be arcing phenomena during coil switching, posing a fire safety hazard. When turning off, the contact separation time is long and the contact separation is slow, which also poses a safety hazard. At the same time, due to high energy consumption for a long time, a large amount of resource waste is generated. Therefore, the dual-coil scheme still has the problem of high losses.

[0033] Subsequently, contactors with control circuits emerged. For example, Chinese Patent (CN201921881468.0) discloses a power-saving control circuit for a contactor, including a first switching tube, a second switching tube, a first diode, a second diode, and a first resistor. The working process of the contactor includes three stages: suction, holding, and turning off. During the suction stage, both switching tubes are closed, the circuit absorbs energy from the power grid, and a large current flows through the contactor coil, causing the main contacts to quickly close. Chinese Patent (CN201911066386.5) discloses a power-saving control circuit for a contactor and its control method. The power-saving control circuit for a contactor includes a first switching tube, a second switching tube, a first diode, a second diode, and a first resistor. Chinese Patent (CN201620704402.4) discloses a coil control circuit for a contactor, including a switch control circuit, a drive circuit, a fast turn-off circuit, a diode, a first MOS tube, and a contactor coil. Although the contactor schemes described in these contactor control circuit patents are in a usable state, there is still room for further reduction of their losses, and they are not excellent enough. In addition to the coil power consumption that ensures the function of the contactor, the losses in other parts of the contactor are still high.

[0034] This application conducts in-depth research on the problems existing in contactors in related technologies, provides a new circuit topology structure, generates a new generation of low-power contactor topology circuits, and reduces the losses in other key parts of the contactor on the premise of ensuring normal functions.

[0035] The following combines the accompanying drawings to make a detailed description of some embodiments of this application. Without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0036] Please refer to Figure 3 , Figure 3 which is a schematic structural diagram of a low-power consumption contactor topology circuit shown in an exemplary embodiment of this application.

[0037] As Figure 3As shown in the figure, the low - energy - consumption contactor topology circuit includes a main control switch Q1. The source of the main control switch Q1 is grounded, and the main control switch Q1 is used to control the turn - off and turn - on of the contactor topology circuit; a first current suppression branch, which is serially connected between the drain of the main control switch Q1 and the power supply; a second current suppression branch, which is serially connected between the drain of the main control switch Q1 and the power supply and is parallel to both ends of the first current suppression branch. The first current suppression branch and the second current suppression branch are used to reduce the spike current generated at the moment when the main control switch Q1 switches from the off state to the on state, thereby reducing the turn - on loss of the main control switch Q1.

[0038] In one embodiment of the present application, the second current suppression branch includes a second current suppression unit 20 and a contactor coil KT, and the second current suppression unit 20 is serially connected to the contactor coil KT. It should be noted that when the second current suppression unit 20 and the contactor coil KT in the second current suppression branch are serially connected, their serial order can be interchanged.

[0039] It should be noted that the second current suppression branch includes at least 1 reactance component, and the second current suppression branch is a branch with the characteristic of inductive reactance.

[0040] In one embodiment of the present application, the second current suppression unit 20 includes at least one second reactance component L2. It can be understood that the second current suppression unit 20 can be a single second reactance component L2, or can be composed of multiple second reactance components L2 connected in series, or can be composed of multiple second reactance components L2 connected in parallel. As long as it is a component with the characteristic of inductive reactance or its function is equivalent to the inductive reactance component in the present application, that is, it can reduce the spike current generated at the moment when the main control switch Q1 switches from the off state to the on state, it belongs to the alternative solutions of the present utility model and cannot be exhausted one by one. The embodiments of the present application do not limit this.

[0041] Please refer to Figure 4 , Figure 4 which is a schematic structural diagram of the low - energy - consumption contactor topology circuit shown in another exemplary embodiment of the present application.

[0042] As Figure 4As shown, the second current suppression unit 20 includes a second inductive reactance component L2; the second current suppression branch includes a second inductive reactance component L2 and a contactor coil KT, and the second inductive reactance component L2 is connected in series with the contactor coil KT. It should be noted that when the second inductive reactance component L2 and the contactor coil KT in the second current suppression branch are connected in series, their series order can be interchanged. For example, in an embodiment of a low-power consumption contactor topology circuit, the device connection mode of "Vin - second current suppression branch - main control switch Q1" can be "Vin - contactor coil KT - second inductive reactance component L2 - main control switch Q1", or "Vin - second inductive reactance component L2 - contactor coil KT - main control switch Q1".

[0043] It can be understood that the source of the main control switch Q1 can also be grounded finally through a series resistor, and the embodiments of the present application do not limit this.

[0044] Please refer to Figure 5 , Figure 5 is a schematic structural diagram of a low-power consumption contactor topology circuit shown in another exemplary embodiment of the present application.

[0045] Such as Figure 5 As shown, the second current suppression branch of the low-power consumption contactor topology circuit may further include a second main control switch Q3; one end of the second main control switch Q3 is connected to the power supply Vin, and the other end is connected in series with the second inductive reactance component L2 or the contactor coil KT. That is, the series relationship among the power supply Vin, the second main control switch Q3, the second inductive reactance component L2, the contactor coil KT, and the main control switch Q1 can be "power supply Vin - second main control switch Q3 - second inductive reactance component L2 - contactor coil KT - main control switch Q1", or "power supply Vin - second main control switch Q3 - contactor coil KT - second inductive reactance component L2 - main control switch Q1".

[0046] Please refer to Figure 5 , Figure 7 , on the basis of the above embodiment, the first current suppression branch includes a freewheeling diode D1.

[0047] In an exemplary embodiment, the first current suppression branch includes a first current suppression unit 10 and a freewheeling diode D1, and the first current suppression unit 10 is connected in series with the freewheeling diode D1. As Figure 3 shown, it can be understood that when the first current suppression unit 10 and the freewheeling diode D1 are connected in series, their series order can be exchanged.

[0048] In an exemplary embodiment, the first current suppression unit 10 includes at least one first inductive reactance component L1, such as Figure 3 and Figure 6As shown. It is understandable that the first current suppression unit 10 can be a first inductive component L1, or can be composed of multiple first inductive components L1 connected in series, or can be composed of multiple first inductive components L1 connected in parallel. As long as it is a component with inductive and inductive characteristics, or its function is equivalent to the inductive and inductive component in this application, that is, it can reduce the peak current generated when the main control switch Q1 switches from the off state to the on state, it is an alternative solution of the present invention, and this embodiment cannot list them all.

[0049] Exemplarily, the first current suppression branch includes a first inductive component L1 and a freewheeling diode D1, wherein the first inductive component L1 and the freewheeling diode D1 are connected in series. It is understood that when the first inductive component L1 and the freewheeling diode D1 are connected in series, the series connection order of the first inductive component L1 and the freewheeling diode D1 can be interchanged.

[0050] The core idea of the low-energy contactor topology circuit in this embodiment lies in the second current suppression branch and the first current suppression branch having inductive reactance and inductive characteristics. This allows the topology circuit to effectively reduce the peak current generated at the moment of switch conversion through the inductive reactance and inductive characteristics in the first current suppression branch and the second current suppression branch while ensuring normal function, thereby reducing the turn-on loss of the main control switch Q1.

[0051] It is understandable that, based on the above embodiments, in order to make the circuit effect better, some circuit components, such as resistors, voltage regulators, etc., can be appropriately added. Figure 6 As shown in FIG, a voltage stabilizing device Z1 is connected in parallel at both ends of the main control switch Q1, and the main control switch Q1 is grounded via a series resistor R1. This embodiment is not limited to this.

[0052] In an exemplary embodiment, the first current suppression branch includes a first current suppression unit 10, a freewheeling diode D1, a controllable fast-off switch Q2, and a voltage stabilizer Z1. The first current suppression unit 10, the freewheeling diode D1, and the controllable fast-off switch Q2 are connected in series, and the voltage stabilizer Z1 is connected in parallel across the controllable fast-off switch Q2. The first current suppression unit 10 includes at least one first inductive reactance component L1, see FIG. Figure 8 .

[0053] like Figure 8In the contactor topology circuit shown in (a), the first current suppression unit 10 includes a first inductive reactance component L1. The first current suppression branch is composed of a first inductive reactance component L1, a freewheeling diode D1, a controllable fast turn-off switch tube Q2, and a voltage regulator component Z1. Among them, the first inductive reactance component L1, the freewheeling diode D1, and the controllable fast turn-off switch tube Q2 are connected in series, and the voltage regulator component Z1 is connected in parallel across the controllable fast turn-off switch tube Q2. The second current suppression unit 20 includes an inductive reactance device L2. The second current suppression branch is composed of an inductive reactance device L2 and a contactor coil KT, and the inductive reactance device L2 is connected in series with the contactor coil KT. In this embodiment, the main control switch Q1 is connected in series with a resistor R1 and grounded to GND.

[0054] As Figure 8 (b) shows a schematic diagram of the current path when the main control switch Q1 is in the off state. During the off period of the main control switch Q1, the current path is through the contactor coil KT, the inductive reactance device L2, the controllable fast turn-off switch tube Q2 / / Z1, the freewheeling diode D1, and the first inductive reactance component L1. Among them, the controllable fast turn-off switch tube Q2 is in the on state, and the voltage across the controllable fast turn-off switch tube Q2 is V Q1 ≈Vin+, the voltage across the freewheeling diode D1 is V D1 ≈0V, and the voltage across the contactor coil KT is V KT ≈0V.

[0055] As Figure 8 (c) shows a schematic diagram of the current path when the main control switch Q1 is in the on state. During the on period of the main control switch Q1, the current path is Vin+, the contactor coil KT, the second inductive reactance device L2, the main control switch Q1, the resistor R1, GND. The voltage across the main control switch Q1 is V Q1 ≈0V, the voltage across the freewheeling diode D1 is V D1 ≈Vin+, and the voltage across the contactor coil KT is V KT ≈Vin+.

[0056] When the main control switch Q1 changes from the off state to the on state, two key variables change: the current path changes, and the voltages of the main control switch Q1, the freewheeling diode D1, and the contactor coil KT change. In the Figure 1 shown traditional contactor topology, when the main control switch Q1 changes from the off state to the on state, the voltage of the contactor coil KT changes from 0V to Vin+. The influence of the parasitic capacitance will generate a spike current. The generation mechanism is: Among them, i is the current, c is the parasitic capacitance, u is the operating voltage of the parasitic capacitance, t is the voltage, and u is the time when the voltage changes. Therefore, the higher the operating voltage, the greater the turn-on loss. At the same time, the reverse recovery of the freewheeling diode D1 will also generate a spike current. The superposition of the two on the MOS tube main control switch Q1 will form a very large switching loss.

[0057] In the improved low - energy - consumption contactor topology circuit of the present application, a second inductive reactance device L2 is connected in series with the contactor coil KT, and a first inductive reactance device L1 is connected in series with the free - wheeling diode D1. When the main control switch Q1 of the topology circuit changes from the off state to the on state, the mechanism of generating current during voltage mutation is as follows: Among them, ΔI is the current change generated during voltage mutation, L is L2 or L1, V is the voltage across L2 or L1 at the moment of turn - on. The current spike generated is much lower than that of the traditional contactor topology circuit. The cross - loss during the turn - on process of Q1 is greatly reduced. The circuit topology is particularly effective when applied to high - voltage contactors. After actual testing, the energy consumption during long - term maintenance of the contactor is reduced by 40%. Please refer to Figure 9 , Figure 9 It is a schematic diagram of the energy - consumption effect comparison between the node waveforms of a traditional topology circuit (a) in the embodiment of the present application and the node waveforms of the circuit of the present application (b). Figure 9 (a) is a schematic diagram of the working waveform of the MOS main control switch Q1 in the traditional contactor topology circuit. In the figure, Q1(I_ds) is the current of the MOS main control switch Q1, Q1(V_ds) is the drain - source voltage of the MOS main control switch Q1, and Q1(VGS) is the drive voltage of the MOS main control switch Q1. When the MOS main control switch Q1 is in the off state, Q1(VGS) is at a low level. When the MOS main control switch Q1 is in the on state, Q1(VGS) is at a high level. When the MOS main control switch Q1 changes from the off state to the on state, Q1(VGS) changes from a low level to a high level, Q1(V_ds) changes from Vin to 0, and Q1(I_ds) changes from 0 to the normal operating current I ON , and a loss is formed on Q1 during this process. The loss P = Q1(V_ds)*Q1(I_ds). Among them, at the moment of turn - on, due to the influence of the parasitic capacitances of KT and D1, the current spike of Q1(I_ds) generated is very large. Figure 9 (b) is a schematic diagram of the working waveform of the MOS main control switch Q1 in the contactor topology circuit of the present application. At the moment of MOS turn - on, due to the existence of L1 and L2, the inductive reactance modules L1 and L2 have the characteristic of suppressing current change, thus greatly reducing the loss at the moment of Q1 turn - on.

[0058] The above - mentioned is only the preferred specific implementation manner of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model, according to the technical solution of the present utility model and its inventive concept, makes equivalent replacements or changes, and all should be covered within the protection scope of the present utility model.

Claims

1. A low - energy - consumption contactor topology circuit, characterized in that, Comprising: A main control switch Q1, the source of the main control switch Q1 being grounded, and the main control switch Q1 being used to control the turn-off and turn-on of the contactor topology circuit; A first current suppression branch, the first current suppression branch being connected in series between the drain of the main control switch Q1 and the power supply; A second current suppression branch, the second current suppression branch being connected in series between the drain of the main control switch Q1 and the power supply and being connected in parallel across both ends of the first current suppression branch; the second current suppression branch is a branch having an inductive reactance inductance characteristic; The first current suppression branch and the second current suppression branch are used to reduce the spike current generated at the moment of conversion of the main control switch Q1 from the off state to the on state, thereby reducing the turn-on loss of the main control switch Q1.

2. The low-energy consumption contactor topology circuit according to claim 1, wherein The second current suppression branch includes a second current suppression unit and a contactor coil KT, and the second current suppression unit is connected in series with the contactor coil KT.

3. The low-energy consumption contactor topology circuit according to claim 2, characterized in that, The second current suppression unit includes at least one second inductive reactance component L2.

4. The low-energy consumption contactor topology circuit according to claim 3, wherein The second current suppression unit includes one second inductive reactance component L2; the second current suppression branch includes one second inductive reactance component L2 and the contactor coil KT, and the second inductive reactance component L2 is connected in series with the contactor coil KT.

5. The low-power contactor topology circuit according to claim 4, wherein, The second current suppression branch further includes a second main control switch Q3; one end of the second main control switch Q3 is connected to the power supply Vin, and the other end is connected in series with the second inductive reactance component L2 or the contactor coil KT.

6. The low-power contactor topology circuit according to any one of claims 1-5, characterized in that The first current suppression branch includes a freewheeling diode D 7. The low-power contactor topology circuit according to any one of claims 1-5, characterized in that, 1.

8. The low-power contactor topology circuit according to claim 7, characterized in that, The first current suppression branch includes a first current suppression unit and a freewheeling diode D1, and the first current suppression unit is connected in series with the freewheeling diode D1.

9. The low-power contactor topology circuit according to claim 8, wherein The first current suppression unit includes at least one first inductive reactance component L1.

10. The low-energy consumption contactor topology circuit according to any one of claims 1-5, characterized in that, The first current suppression branch includes one first inductive reactance component L1 and the freewheeling diode D1, and the first inductive reactance component L1 is connected in series with the freewheeling diode D1.

11. The low-energy consumption contactor topology circuit according to claim 10, characterized in that, The first current suppression branch includes a first current suppression unit, a freewheeling diode D1, a controllable fast turn-off switch tube Q2, and a voltage regulator device Z1. The first current suppression unit, the freewheeling diode D1, and the controllable fast turn-off switch tube Q2 are connected in series, and the voltage regulator device Z1 is connected in parallel across both ends of the controllable fast turn-off switch tube Q2. The first current suppression unit includes at least one first inductive reactance component L1.

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