Circuit for controlling coil of contactor and contactor including the circuit
By simplifying the contactor coil circuit structure, reducing the number of electronic switches, and optimizing current control, the high cost problem caused by the complexity of the contactor coil circuit in the prior art has been solved, and the miniaturization and cost reduction of the contactor have been achieved.
Patent Information
- Application Number
- CN202423037615.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-10
- Publication Date
- 2025-11-21
- Estimated Expiration
- 2034-12-10
AI Technical Summary
The coil circuit structure used to control contactors in the prior art is complex, resulting in high manufacturing costs and making it difficult to achieve miniaturization and weight reduction of contactors.
The contactor coil circuit structure is simplified, the number of electronic switches is reduced, and the current control process is optimized by selecting TVS diodes with appropriate breakdown voltages and combinations of diodes, and using pulse width modulation signals to control the duty cycle of the electronic switches.
It achieves miniaturization, weight reduction, and cost reduction of contactors, simplifies circuit design, reduces manufacturing costs, and maintains control efficiency.
Smart Images
Figure CN223582893U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a circuit for controlling the coil of a contactor and a contactor including the circuit, and more specifically, to a simplified, low-cost circuit for controlling the coil of a contactor and a contactor including the circuit. Background Technology
[0002] In the field of electrical engineering, contactors are widely used electronic components. Contactors use electromagnetic fields to control circuits and thus open and close them. With technological advancements, the demand for miniaturized, lightweight, and low-cost contactors has become increasingly prominent.
[0003] Contactors can be optimized in various aspects to achieve miniaturization, weight reduction, and cost reduction. In existing technologies, the circuit structure for controlling the contactor coil is relatively complex. Therefore, this invention provides an improved circuit for controlling the contactor coil. Compared with existing circuits, the improved circuit provided by this invention has a simplified circuit structure, thus reducing manufacturing costs and achieving miniaturization, weight reduction, and cost reduction of the contactor. Utility Model Content
[0004] According to one aspect of the present invention, a circuit for controlling the coil of a contactor is provided, characterized in that the circuit comprises: a main circuit including an electronic switch and a first coil connected in series; and a first branch including a diode and a first electronic component connected in series, wherein the first branch is connected in parallel with the first coil.
[0005] In some embodiments, the electronic switch is connected to a first end of a first coil.
[0006] In some embodiments, the electronic switch is connected to a second end of the first coil, and the second end is different from the first end.
[0007] In some embodiments, the opening and closing of the electronic switch is controlled by a pulse width modulation (PWM) signal.
[0008] In some embodiments, the first electronic component is a transient voltage suppression (TVS) diode.
[0009] In some embodiments, the anode of the diode is connected to the anode of the TVS diode, the cathode of the diode is connected to the first end of the first coil, and the cathode of the TVS diode is connected to the second end of the first coil.
[0010] In some embodiments, the breakdown voltage of the TVS diode is 30V.
[0011] In some embodiments, the first electronic component is a resistor.
[0012] In some embodiments, the positive terminal of the diode is connected to the first end of the resistor, the negative terminal of the diode is connected to the first end of the first coil, and the second end of the resistor is connected to the second end of the first coil.
[0013] In some embodiments, the first electronic component is a second coil, which is different from the first coil.
[0014] In some embodiments, the positive terminal of the diode is connected to the first end of the second coil, the negative terminal of the diode is connected to the first end of the first coil, and the second end of the second coil is connected to the second end of the first coil.
[0015] According to another aspect of the present invention, a contactor is provided, characterized in that the contactor includes the circuit as described in any of the preceding claims. Attached Figure Description
[0016] The aspects, features, and advantages of this utility model will become clearer and more readily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:
[0017] Figure 1 A circuit for controlling a coil in a contactor in the prior art is shown;
[0018] Figure 2A It is shown Figure 1 A schematic diagram of the current in the coil;
[0019] Figure 2B It is shown Figure 2A A schematic diagram of the current flowing through the coil during the holding phase;
[0020] Figure 3 An example circuit for controlling a coil in a contactor according to an embodiment of the present invention is shown;
[0021] Figure 4A It is shown Figure 3 A schematic diagram of the current in the coil;
[0022] Figure 4B It is shown Figure 4A A schematic diagram of the current flowing through the coil during the holding phase;
[0023] Figure 5 Another example circuit for controlling a coil in a contactor according to an embodiment of the present invention is shown;
[0024] Figure 6 Another example circuit for controlling a coil in a contactor according to an embodiment of the present invention is shown;
[0025] Figure 7 Another example circuit for controlling a coil in a contactor according to an embodiment of the present invention is shown;
[0026] Figure 8 Further example circuits for controlling coils in a contactor according to embodiments of the present invention are shown; and
[0027] Figure 9 Another example circuit for controlling a coil in a contactor according to an embodiment of the present invention is shown. Detailed Implementation
[0028] The present invention will now be described in detail with reference to exemplary embodiments thereof. However, the present invention is not limited to the embodiments described herein, and may be embodied in many different forms. The described embodiments are only intended to thoroughly and completely convey the concept of the present invention to those skilled in the art. Features of the various described embodiments may be combined with or substituted for each other, unless expressly excluded or should be excluded based on the context.
[0029] In the embodiments of this utility model, unless otherwise explicitly stated, "connection" or "connection" does not necessarily mean "direct connection" or "direct contact," but only requires electrical connection. Furthermore, the terms "first," "second," or similar expressions used herein are for descriptive and distinguishing purposes only and do not indicate any priority or order, nor should they be construed as indicating or implying the relative importance of the corresponding components, nor do they represent whether the described parameter values are the same or different.
[0030] Figure 1 A prior art circuit for controlling a coil in a contactor is shown. In the prior art, the circuit for controlling the coil in a contactor typically includes a first electronic switch S101, a coil L103, a diode D105, a transient voltage suppression (TVS) diode TVS107, and a second electronic switch S109. For example... Figure 1As shown, the first electronic switch S101, coil L103, and second electronic switch S109 are connected in series. A TVS diode TVS107 is connected in parallel with the second electronic switch S109, and a diode D105 is also connected in parallel with both coil L103 and the second electronic switch S109. The breakdown voltage of TVS107 is 500V. When both the first and second electronic switches S101 and S109 are closed, coil L103 is connected to the power supply and is charged. When the first electronic switch S101 is open and the second electronic switch S109 is closed, coil L103 and diode D105 form a circuit, diode D105 freewheels, and the current flowing through coil L103 decreases. When both the first electronic switch S101 and the second electronic switch S109 are open, the coil L103, the TVS diode TVS107 and the diode D105 form a circuit. The TVS diode TVS107 is broken down momentarily and immediately recovers and is regarded as an open circuit. The current flowing through the coil L103 drops rapidly to zero.
[0031] The current flowing through coil L103 can be divided into an inrush phase, a holding phase, and an opening phase. During the inrush and holding phases, the opening and closing of the first electronic switch S101 is controlled by a control signal. The control signal is a pulse width modulation (PWM) signal. Specifically, the duty cycle of the first electronic switch S101 during the inrush phase is higher than that during the holding phase. For example, during the holding phase, the duty cycle of the first electronic switch S101 can be set to be no less than 4%. During the inrush and holding phases, the second electronic switch S109 remains closed. During the opening phase, both the first electronic switch S101 and the second electronic switch S109 are open. Figure 2A and Figure 2B Describe the changes in current flowing through coil L103 when the first electronic switch S101 and the second electronic switch S109 are open and / or closed.
[0032] Figure 2A It is shown Figure 1 A schematic diagram of the current in coil L103, and Figure 2B It is shown Figure 2A A schematic diagram of the current flowing through coil L103 during the holding phase.
[0033] like Figure 2AAs shown, between times t0 and t1, the first electronic switch S101 has a first duty cycle, and the second electronic switch S109 remains closed, causing the current flowing through coil L103 to increase rapidly. Between times t1 and t2, the first electronic switch S101 opens, and the second electronic switch S109 remains closed, forming a circuit with coil L103 and diode D105. Diode D105 freewheels, and the current flowing through coil L103 decreases. The time length between t1 and t2 can be set between 10 ms and 30 ms. Between times t2 and t3, the first electronic switch S101 has a second duty cycle, and the second electronic switch S109 remains closed, causing the current flowing through coil L103 to increase slowly. The duty cycle of the first electronic switch S101 can be automatically adjusted based on an algorithm according to the specific implementation of the circuit. For example, the second duty cycle is lower than the first duty cycle and can be set to be no less than 4%. At time t3, the second electronic switch S109 opens, and some time before time t3, the first electronic switch S101 opens and no longer closes. Coil L103, TVS diode TVS107, and diode D105 form a circuit. TVS diode TVS107, after being momentarily broken down, immediately recovers and is considered an open circuit. The current flowing through coil L103 rapidly drops to zero. (As...) Figure 2A As shown, a period of time, such as 5ms, before the second electronic switch S109 is turned on and off, the first electronic switch S101 is turned off and no longer closed. The time between t0 and t1 can be called the pull-in phase, the time between t1 and t3 can be called the holding phase, and the time after t3 can be called the open-circuit phase.
[0034] Although Figure 2A The current flowing through coil L103 between t0 and t1, and between t2 and t3, is shown as a linear increase. However, it can be understood that between t0 and t1, and between t2 and t3, as the first electronic switch S101 switches between open and closed (with a specific duty cycle), the current flowing through coil L103 also increases and decreases accordingly, but the overall trend of the current flowing through coil L103 is increasing. This will be combined with... Figure 2B The specific description covers the changes in current flowing through coil L103 during the holding phase.
[0035] like Figure 2BAs shown, during the holding phase, the first electronic switch S101 switches between open and closed (with a second duty cycle), while the second electronic switch S109 remains closed. When both the first and second electronic switches S101 are closed, the current flowing through coil L103 increases, and when the first electronic switch S101 is open and the second electronic switch S109 is closed, the current flowing through coil L103 decreases. However, considering that the resistance of diode D105 is typically very small, the rate of current decrease is usually slower than the rate of current increase. Therefore, even during the holding phase, the current flowing through coil L103 increases slowly, making it impossible to maintain a relatively low current value.
[0036] Existing circuits for controlling coils in contactors provide control, but their complex structure and high manufacturing cost result in inefficient circuits. To further meet the requirements of miniaturization, lightweight design, and low cost in contactors, this invention proposes a simplified, low-cost circuit for controlling coils in contactors while maintaining control efficiency.
[0037] Figure 3 An example circuit for controlling a coil in a contactor according to an embodiment of the present invention is shown.
[0038] like Figure 3 As shown, the circuit includes an electronic switch S301, a coil L303, a diode D305, and a TVS diode TVS307. Specifically, the electronic switch S301 and the coil L303 are connected in series, and the diode D305 and the TVS diode TVS307 are connected in series. The anode of diode D305 is connected to the anode of TVS diode TVS307, and the branch including diodes D305 and TVS diode TVS307 is connected in parallel with the coil L303. When the electronic switch S301 is closed, the coil L303 is connected to the power supply, and the coil L303 is charged. When electronic switch S301 is open, coil L303, TVS diode TVS307 and diode D305 form a circuit. After TVS diode TVS307 is broken down, it recovers after a period of time and is considered an open circuit. During the time that TVS diode TVS307 is broken down but has not recovered, diode D305 freewheels, and the current flowing through coil L303 decreases. After TVS diode TVS307 recovers, the current flowing through coil L103 drops rapidly to zero.
[0039] and Figure 1 The circuit shown differs from those in the prior art; the circuit according to the embodiments of this invention reduces the number of electronic switches, for example, omitting... Figure 1 The second electronic switch S109 in the circuit can be omitted, thus simplifying the circuit design and saving manufacturing costs.
[0040] Coil L303 may also have an inrush phase, a holding phase, and an opening phase. During the inrush and holding phases, the opening and closing of electronic switch S301 is controlled by a control signal. In some embodiments, the control signal may be a pulse width modulation (PWM) signal. Specifically, during the inrush phase, the duty cycle of electronic switch S301 is high, and during the holding phase, the duty cycle of electronic switch S301 is low. In some embodiments, during the holding phase, the duty cycle of electronic switch S301 may be set to be not less than 4%. Figure 4A and Figure 4B Describe the change in current flowing through coil L303 when electronic switch S301 is open or closed.
[0041] Compared to existing technologies, the circuit proposed in this invention reduces one electronic switch. Therefore, the TVS307 needs to have an appropriate breakdown voltage so that during the switching process between the open and closed states of the electronic switch S301, when the electronic switch S301 is open, the TVS307, after being broken down, does not recover immediately but recovers only after a period of time. This prevents the current flowing through the coil L303 from decreasing too quickly during the holding phase and also prevents the current flowing through the coil L303 from decreasing to zero too slowly during the open-circuit phase. In some embodiments, the TVS307 can be a TVS with a breakdown voltage of 30V. Thus, during the holding phase, when the electronic switch S301 has a specific duty cycle, the current flowing through the coil L303 can increase or decrease with the opening and closing of the electronic switch S301, but will not decrease too quickly when the electronic switch S301 is open. And during the open-circuit phase, when the electronic switch S301 is open and no longer closed, the current flowing through the coil L303 can quickly decrease to zero. However, this invention is not limited to this. Depending on the specific implementation of the circuit, TVS307 can be selected as a TVS with different breakdown voltages.
[0042] Figure 4A It is shown Figure 3 A schematic diagram of the current in the coil, and Figure 4B It is shown Figure 4A A schematic diagram of the current flowing through the coil during the holding phase;
[0043] like Figure 4AAs shown, between times t0 and t1, electronic switch S301 has a first duty cycle, and the current flowing through coil L303 increases rapidly. Between times t1 and t2, electronic switch S301 is open, and coil L303, diode D305, and TVS307 form a circuit. Due to the low breakdown voltage of TVS307, TVS307 is broken down for a period of time, diode D305 freewheels, and the current flowing through coil L303 decreases. In some embodiments, the duration between t1 and t2 can be set between 10 ms and 30 ms. Between times t2 and t3, electronic switch S301 has a second duty cycle, and the current flowing through coil L103 increases when electronic switch S301 is closed and decreases when electronic switch S301 is open, thus maintaining a generally low current value. The duty cycle of electronic switch S301 can be automatically adjusted based on an algorithm according to the specific implementation of the circuit. For example, the first and second duty cycles can be adjusted so that the second duty cycle is lower than the first duty cycle. In some embodiments, the second duty cycle can be set to not less than 4%. At time t3, electronic switch S301 opens and no longer closes, coil L303, diode D305, and TVS307 form a circuit. TVS307 recovers after being broken down for a period of time and is considered an open circuit, and the current flowing through coil L303 rapidly drops to zero. Similarly, the time between t0 and t1 can be referred to as the pull-in stage, the time between t1 and t3 can be referred to as the hold stage, and the time after t3 can be referred to as the open-circuit stage.
[0044] Although Figure 4A The current flowing through coil L103 between t0 and t1, and between t2 and t3, is shown as a linear progression. However, it can be understood that between t0 and t1, as electronic switch S301 switches between open and closed, the current flowing through coil L303 increases and decreases accordingly. Due to the high duty cycle of electronic switch S301, the overall trend of the current flowing through coil L303 is increasing. Furthermore, between t2 and t3, as electronic switch S301 switches between open and closed, the current flowing through coil L303 also increases and decreases accordingly. Due to the low duty cycle of electronic switch S301, the simplified circuit structure, and the selection of a TVS with an appropriate breakdown voltage, the current flowing through coil L303 generally remains at a low value. This will be combined with... Figure 4B Specifically describe the current flowing through coil L303 during the holding phase.
[0045] like Figure 4BAs shown, electronic switch S301 switches between open and closed states. When electronic switch S301 is closed, the current flowing through coil L303 increases, and when electronic switch S301 is open, the current flowing through coil L303 decreases. Due to the low duty cycle of electronic switch S301, the simplified circuit structure, and the selection of a TVS with an appropriate breakdown voltage, during the holding phase, although the current flowing through coil L103 increases and decreases with the opening and closing of electronic switch S301, it can generally be maintained at a relatively low current value.
[0046] Figure 5 Another example circuit for controlling a coil in a contactor according to an embodiment of the present invention is shown.
[0047] like Figure 5 As shown, the circuit includes an electronic switch S501, a coil L503, a diode D505, and a resistor R507. Specifically, the electronic switch S501 and the coil L503 are connected in series, the diode D505 and the resistor R507 are connected in series, and the branch including the diode D505 and the resistor R507 is connected in parallel with the coil L503. When the electronic switch S501 is closed, the coil L503 is connected to the power supply and is charged. When the electronic switch S501 is open, the coil L503 discharges through the circuit formed by the coil L503, the resistor R507, and the diode D505. The value of the resistor R507 can be selected differently depending on the specific implementation of the circuit. Figure 5 The circuit shown includes other electronic components and their operation process. Figure 3 The circuit shown is the same, and will not be described again here to avoid redundancy.
[0048] Figure 6 Another example circuit for controlling a coil in a contactor according to an embodiment of the present invention is shown.
[0049] like Figure 6 As shown, the circuit includes an electronic switch S601, a first coil L603, a diode D605, and a second coil L607. Specifically, the electronic switch S601 is connected in series with the first coil L603, and the diode D605 is connected in series with the second coil L607. A branch including the diode D605 and the second coil L607 is connected in parallel with coil L603. When the electronic switch S601 is closed, the first coil L603 is connected to a power source and is charged. When the electronic switch S601 is open, the first coil L603 discharges through the circuit formed by the first coil L603, the second coil L607, and the diode D605. The size of coil L607 can be selected differently depending on the specific implementation of the circuit. Figure 6 The circuit shown includes other electronic components and their operation process. Figure 3 The circuit is the same as that shown in Figure 4, and will not be described again here to avoid redundancy.
[0050] Figure 7 Another example circuit for controlling a coil in a contactor according to an embodiment of the present invention is shown.
[0051] like Figure 7 As shown, the circuit includes an electronic switch S701, a coil L703, a diode D705, and a TVS diode TVS707. Figure 7 The circuit shown is Figure 3 The circuits shown are basically the same, except for the position of the electronic switch. Figure 3 In the circuit, electronic switch S301 is connected to one end of coil L303 and the negative terminal of diode D305, while... Figure 7 In the middle, electronic switch S701 is connected to the other end of coil L703 and the negative terminal of TVS diode TVS707. Figure 7 The circuit shown includes other electronic components and their operation process. Figure 3 The circuit shown is the same, and will not be described again here to avoid redundancy.
[0052] Figure 8 Another example circuit for controlling a coil in a contactor according to an embodiment of the present invention is shown.
[0053] like Figure 8 As shown, the circuit includes an electronic switch S801, a coil L803, a diode D805, and a resistor R807. Figure 8 The circuit shown is Figure 5 The circuits shown are basically the same, except for the position of the electronic switch. Figure 5 In the circuit, electronic switch S501 is connected to one end of coil L503 and the negative terminal of diode D505, while... Figure 8 In the circuit, electronic switch S801 is connected to the other end of coil L803 and resistor R807 is not connected to the positive terminal of diode D805. Figure 8 The circuit shown includes other electronic components and their operation process. Figure 5 The circuit shown is the same, and will not be described again here to avoid redundancy.
[0054] Figure 9 Another example circuit for controlling a coil in a contactor according to an embodiment of the present invention is shown.
[0055] like Figure 9 As shown, the circuit includes an electronic switch S901, a first coil L903, a diode D905, and a second coil L907. Figure 9 The circuit shown is Figure 6The circuits shown are basically the same, except for the position of the electronic switch. Figure 6 In the circuit, electronic switch S601 is connected to one end of the first coil L603 and to the negative terminal of diode D605, while... Figure 9 In the middle, electronic switch S901 is connected to the other end of the first coil L903 and the second coil L907 is not connected to the positive terminal of diode D905. Figure 9 The circuit shown includes other electronic components and their operation process. Figure 6 The circuit shown is the same, and will not be described again here to avoid redundancy.
[0056] It should be noted that, for clarity and simplicity, only the parts related to the embodiments of the present invention are shown in the accompanying drawings. However, those skilled in the art should understand that the devices or apparatus shown in the drawings may include other necessary elements.
[0057] The block diagrams of circuits, devices, apparatuses, equipment, and systems involved in this utility model are merely illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the block diagrams. As those skilled in the art will recognize, these circuits, devices, apparatuses, equipment, and systems can be connected, arranged, and configured in any manner that achieves the desired purpose. The quantities involved in this utility model are merely illustrative.
[0058] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.
[0059] In the embodiments provided in this application, it should be understood that the disclosed systems and devices can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between devices or units may be electrical, mechanical, or other forms.
[0060] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.
[0061] Furthermore, in the various embodiments of this utility model, the functional units can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.
[0062] Those skilled in the art should understand that the specific embodiments described above are merely examples and not limitations. Various modifications, combinations, partial combinations, and substitutions can be made to the embodiments of this utility model according to design requirements and other factors, as long as they are within the scope of the appended claims or their equivalents, and thus fall within the scope of the rights to be protected by this utility model.
Claims
1. A circuit for controlling the coil of a contactor, characterized in that, The circuit includes: The main circuit includes an electronic switch and a first coil connected in series; and The first branch includes a diode and a first electronic component connected in series. The first branch is connected in parallel with the first coil.
2. The circuit according to claim 1, characterized in that, The electronic switch is connected to the first end of the first coil.
3. The circuit according to claim 1, characterized in that, The electronic switch is connected to the second end of the first coil, and the second end is different from the first end.
4. The circuit according to claim 1, characterized in that, The opening and closing of the electronic switch is controlled by a pulse width modulation (PWM) signal.
5. The circuit according to claim 1, characterized in that, The first electronic component is a transient voltage suppressor (TVS) diode.
6. The circuit according to claim 5, characterized in that, The positive terminal of the diode is connected to the positive terminal of the TVS diode, the negative terminal of the diode is connected to the first end of the first coil, and the negative terminal of the TVS diode is connected to the second end of the first coil.
7. The circuit according to claim 5, characterized in that, The breakdown voltage of the TVS diode is 30V.
8. The circuit according to claim 1, characterized in that, The first electronic component is a resistor.
9. The circuit according to claim 8, characterized in that, The positive terminal of the diode is connected to the first end of the resistor, the negative terminal of the diode is connected to the first end of the first coil, and the second end of the resistor is connected to the second end of the first coil.
10. The circuit according to claim 1, characterized in that, The first electronic component is a second coil, which is different from the first coil.
11. The circuit according to claim 10, characterized in that, The positive terminal of the diode is connected to the first end of the second coil, the negative terminal of the diode is connected to the first end of the first coil, and the second end of the second coil is connected to the second end of the first coil.
12. A contactor, characterized in that, The contactor includes the circuitry described in any one of claims 1-11.