Electromagnetic needle selection driving control circuit, needle selector and glove machine
By adopting a half-bridge circuit matrix connection in the needle selector of the glove machine and sharing a common half-bridge control coil, the problem of complex traditional glove machine drive control circuits is solved, achieving circuit simplification, cost reduction, and improved equipment reliability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHEJIANG BAIXIANG TECHNOLOGY CO LTD
- Filing Date
- 2025-05-21
- Publication Date
- 2026-05-15
AI Technical Summary
The drive control circuit of the needle selector of the traditional glove machine is complex and requires a large number of I/O interfaces, resulting in complex circuit board design, high cost, large space occupation and low reliability.
A matrix circuit is formed by M first half-bridge circuits and N second half-bridge circuits. Each intersection is a line packet. Multiple line packets are controlled by sharing a common half-bridge, thereby reducing the number of I/O ports.
It simplifies circuit design, reduces hardware costs and circuit board size, and improves equipment reliability and lifespan.
Smart Images
Figure CN224243390U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of glove machine control technology, and in particular to electromagnetic needle selection drive control circuit, needle selector and glove machine. Background Technology
[0002] In traditional glove machine needle selection technology, the drive control method for the needle selector is relatively simple, typically employing a basic electromagnetic drive. However, existing drive circuits are complex, requiring numerous input / output (I / O) interfaces to control each needle selector. This results in complex circuit board design, high cost, and large space occupation. Furthermore, the complex circuit design and numerous I / O interfaces increase the risk of system failure, reducing the reliability and lifespan of the equipment. Utility Model Content
[0003] This application provides an electromagnetic needle selection drive control circuit, a needle selector, and a glove machine, to at least solve the problem that electromagnetic needle selection drive circuits in related technologies require a large number of I / O interfaces.
[0004] In a first aspect, embodiments of this application provide an electromagnetic needle selection drive control circuit, including M first half-bridge circuits and N second half-bridge circuits, wherein the M first half-bridge circuits and N second half-bridge circuits are connected to form a matrix circuit, and each intersection of the matrix is a coil.
[0005] The first half-bridge circuit is connected between the power supply and the first end of the coil, and the second half-bridge circuit is connected between the power supply and the second end of the coil. The control terminals of the first half-bridge circuit and the second half-bridge circuit are connected to control signals with opposite levels.
[0006] In one embodiment, the first half-bridge circuit or the second half-bridge circuit includes an upper bridge arm and a lower bridge arm; wherein, the upper bridge arm is connected between the positive terminal of the power supply and the first end of the coil; and the lower bridge arm is connected between the first end of the coil and the negative terminal of the power supply.
[0007] Specifically, when the control terminal receives a first-level signal, the upper bridge arm is turned on and the lower bridge arm is turned off; when the control terminal receives a second-level signal, the upper bridge arm is turned off and the lower bridge arm is turned on.
[0008] In one embodiment, the upper bridge arm includes a first switching transistor; wherein the control terminal of the first switching transistor is connected to the I / O interface of the microprocessor, the input terminal is connected to the positive terminal of the power supply, and the output terminal is connected to the coil;
[0009] The lower bridge arm includes a second switching transistor; wherein the control terminal of the second switching transistor is connected to the I / O interface of the microprocessor, the input terminal is connected to the negative terminal of the power supply, and the output terminal is connected to the coil.
[0010] In one embodiment, the upper bridge arm further includes a first resistor, a second resistor, and a third switching transistor;
[0011] The control terminal of the third switch is connected to a positive voltage, the first resistor is connected between the positive terminal of the power supply and the control terminal of the first switch, and the microprocessor's I / O interface drives the first switch through the second resistor and the third switch.
[0012] In one embodiment, the lower bridge arm further includes a third resistor and a fourth resistor;
[0013] The microprocessor's I / O interface drives the second switching transistor through the third resistor; the fourth resistor is connected between the negative terminal of the power supply and the control terminal of the second switching transistor.
[0014] In one embodiment, the first switch is a PMOS transistor, the second switch is an NMOS transistor, and the third switch is a transistor.
[0015] In one embodiment, M or N is an integer not less than 2.
[0016] In one embodiment, the energizing time of the coil is a first duration, and the interval between two energizing times is a second duration.
[0017] Secondly, embodiments of this application provide a needle selector, including a microprocessor and an electromagnetic needle selector drive control circuit as described in any of the preceding embodiments, wherein the electromagnetic needle selector drive control circuit is driven by the microprocessor.
[0018] Thirdly, embodiments of this application provide a glove machine, including the electromagnetic needle selection drive control circuit as described in any of the preceding embodiments.
[0019] The electromagnetic needle selection drive control circuit, needle selector, and glove machine provided in this application embodiment have at least the following technical effects:
[0020] This application provides an electromagnetic needle selection drive control circuit comprising M first half-bridge circuits and N second half-bridge circuits, wherein the M first half-bridge circuits and N second half-bridge circuits are interconnected to form a matrix circuit, and each intersection of the matrix represents a coil. That is, this application, through the matrix connection, allows the left and right half-bridges to be grouped and share a common half-bridge, requiring only a small number of I / O ports to control multiple coils, thus greatly saving microcontroller resources.
[0021] Details of one or more embodiments of this application are set forth in the following drawings and description to make other features, objects and advantages of this application more readily apparent. Attached Figure Description
[0022] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:
[0023] Figure 1 This is a schematic diagram of the circuit structure of the electromagnetic needle selection drive control circuit in one embodiment of this application;
[0024] Figure 2 This is a schematic diagram of the matrix arrangement of the electromagnetic needle selection drive control circuit in one embodiment of this application;
[0025] Figure 3 This is a circuit diagram of the electromagnetic needle selection drive control circuit in one embodiment of this application;
[0026] Figure 4(a) is a forward conduction diagram of the coil in one embodiment of this application;
[0027] Figure 4(b) is a reverse conduction diagram of the coil in one embodiment of this application. Detailed Implementation
[0028] To make the objectives, technical solutions, and advantages of this application clearer, the application is described and illustrated below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application. All other embodiments obtained by those skilled in the art based on the embodiments provided in this application without inventive effort are within the scope of protection of this application.
[0029] Obviously, the accompanying drawings described below are merely some examples or embodiments of this application. Those skilled in the art can apply this application to other similar scenarios based on these drawings without any inventive effort. Furthermore, it is understood that although the efforts made in this development process may be complex and lengthy, for those skilled in the art related to the content disclosed in this application, any changes to design, manufacturing, or production based on the technical content disclosed in this application are merely conventional technical means and should not be construed as insufficient disclosure of the content of this application.
[0030] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application may be combined with other embodiments without conflict.
[0031] Unless otherwise defined, the technical or scientific terms used in this application shall have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms “a,” “an,” “an,” “the,” and similar words used in this application do not indicate quantity limitation and may indicate singular or plural. The terms “comprising,” “including,” “having,” and any variations thereof used in this application are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or device that includes a series of steps or modules (units) is not limited to the listed steps or units, but may also include steps or units not listed, or may include other steps or units inherent to these processes, methods, products, or devices. The terms “connected,” “linked,” “coupled,” and similar words used in this application are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. “Multiple” used in this application refers to two or more. “And / or” describes the relationship between related objects, indicating that three relationships may exist; for example, “A and / or B” can represent: A alone, A and B simultaneously, and B alone. The character " / " generally indicates that the preceding and following objects are in an "or" relationship. The terms "first," "second," and "third" used in this application are merely to distinguish similar objects and do not represent a specific ordering of the objects.
[0032] In a first aspect, embodiments of this application provide an electromagnetic needle selection drive control circuit, including M (M is a positive integer) first half-bridge circuits and N (N is a positive integer) second half-bridge circuits. The M first half-bridge circuits and N second half-bridge circuits are connected to form a matrix circuit, with each intersection of the matrix being a coil. The first half-bridge circuits are connected between a power supply and a first end of the coil, and the second half-bridge circuits are connected between the power supply and a second end of the coil. The control terminals of the first and second half-bridge circuits are connected to control signals of opposite levels.
[0033] The circuit structures of the first half-bridge circuit and the second half-bridge circuit are referenced. Figure 1 Each half-bridge circuit consists of two switching transistors. In the first half-bridge circuit, the switching transistors are controlled by signals P1 and N1, and the output terminal C1 of the first half-bridge circuit is connected to the first end of the coil. In the second half-bridge circuit, the switching transistors are controlled by signals CP1 and CN1, and the output terminal CC1 of the second half-bridge circuit is connected to the second end of the coil. When Q1 and Q3 are turned on, the coil is energized and generates a magnetic force; when Q2 and Q4 are turned on, the coil is energized and generates a reverse magnetic force. This application achieves control over the energization of the coil by controlling the first and second half-bridge circuits.
[0034] Normally, controlling a coil to achieve magnetic pole switching requires a half-bridge circuit (i.e., a first half-bridge circuit and a second half-bridge circuit as a half-bridge circuit), which requires 4 I / O ports. Typically, needle selectors use two coils to control one needle, meaning one needle requires 8 I / O ports. This results in a large number of I / O ports and a very large circuit board, increasing both hardware cost and circuit board size. This embodiment uses... Figure 2 and Figure 3 Taking multi-path packet control as an example, assuming the MCU has only 15 groups of I / O ports remaining (15*2=30 in total), this embodiment can use 8 half-bridges as a group, with a total of 7 groups. Each group shares a second half-bridge circuit to cooperate in conduction. See the specific circuit for details. Figure 3 P1-P8 and N1-N8 control the upper and lower bridges of the left half of the 8 coils, respectively. CP1-CP7 and CN1-CN7 control the upper and lower bridges of the right half of the 7 coils, respectively. A total of 7*8=56 coils can be controlled, which greatly saves the number of IO ports and enables arbitrary switching between the output terminals C1-C8 of the left half-bridge circuit and the output terminals CC1-CC7 of the right half-bridge circuit. Figure 2 In the coil control diagram, each intersection represents a coil. To control a particular coil, the corresponding level signal is configured to the corresponding I / O port.
[0035] In one embodiment, reference Figure 1 The first or second half-bridge circuit includes an upper bridge arm and a lower bridge arm; wherein the upper bridge arm is connected between the positive terminal of the power supply and the first end of the coil; and the lower bridge arm is connected between the first end of the coil and the negative terminal of the power supply. When a first level signal is applied to the control terminal, the upper bridge arm is turned on and the lower bridge arm is turned off; when a second level signal is applied to the control terminal, the upper bridge arm is turned off and the lower bridge arm is turned on.
[0036] Preferably, the upper bridge arm includes a first switching transistor Q1 / Q4, and the lower bridge arm includes a second switching transistor Q2 / Q3. The control terminal of the first switching transistor Q1 / Q4 is connected to the microprocessor's I / O interface, its input terminal is connected to the positive terminal of the power supply, and its output terminal C1 is connected to the coil. The control terminal of the second switching transistor Q2 / Q3 is connected to the microprocessor's I / O interface, its input terminal is connected to the negative terminal of the power supply, and its output terminal C1 is connected to the coil.
[0037] Preferably, the first switching transistor Q1 / Q4 is a PMOS transistor and the second switching transistor Q2 / Q3 is an NMOS transistor. That is, in the control scheme for multiple coils, the electromagnetic needle selection drive control circuit is a half-bridge control composed of several NMOS transistors and PMOS transistors.
[0038] This embodiment uses a single coil as an example to illustrate the control process of the half-bridge circuit, referring to Figures 4(a) and 4(b). The following analysis explains the control of current flowing from the left upper bridge to the right lower bridge. P1 and N1 control the conduction of the left upper and lower bridges, while CP1 and CN1 control the conduction of the right upper and lower bridges. C1 and CC1 connect the two ends of the coil. When P1 and N1 are both low, Q1 is on and Q2 is off. When CP1 and CN1 are both high, Q3 is on and Q4 is off. Therefore, the current flows from 24V through the left upper bridge Q1, then into the coil via C1, and out through CC1, passing through the right lower bridge Q3 to ground. Magnetic force is generated at both ends of the coil. The specific current flow is shown in Figure 4(a). When P1 and N1 are both high, Q2 is on and Q1 is off. When CP1 and CN1 are both low, Q4 is on and Q3 is off. Therefore, the current flows from 24V through the upper bridge Q4 on the right, then into the coil through CC1, and out through C1 through the lower bridge Q2 on the left to ground. The magnetic poles of the coil change. The specific current flow is shown in Figure 4(b).
[0039] The control method in this embodiment simplifies software programming. As long as the control levels of the left and right half-bridges are opposite, if the upper and lower bridges of the left half-bridge are given a low level, the upper and lower bridges of the right half-bridge will be given a high level. This can correctly control the coil magnetization and avoid confusion for software engineers when configuring the upper and lower bridges due to different levels. This configuration method is clearer.
[0040] In a preferred embodiment, referring to FIG. 4(a), the upper bridge arm further includes a first resistor R1 / R3, a second resistor R2 / R4, and a third switch Q9 / Q10. The control terminal of the third switch Q9 / Q10 is connected to a positive voltage. The first resistor R1 / R3 is connected between the positive terminal of the power supply and the control terminal of the first switch Q1 / Q4. The microprocessor's I / O interface drives the first switch Q1 / Q4 through the second resistor R2 / R4 and the third switch Q9 / Q10. In this embodiment, the third switch Q9 / Q10 is a transistor; a PMOS transistor is driven by a transistor, and an NMOS transistor is directly driven by an I / O port.
[0041] In a preferred embodiment, referring to FIG4(a), the lower bridge arm further includes a third resistor R5 / R7 and a fourth resistor R6 / R8. The microprocessor's I / O interface drives the second switching transistor Q2 / Q3 through the third resistor R5 / R7; the fourth resistor R6 / R8 is connected between the negative terminal of the power supply and the control terminal of the second switching transistor Q2 / Q3.
[0042] In one embodiment, if a needle is controlled by two coils, then M or N is set to an integer not less than 2 so that two adjacent coils control the same needle. Therefore, the values of M and N can be determined according to the number of remaining IO ports of the MCU, the number of coils corresponding to a needle, etc., or can be set according to user requirements.
[0043] In one embodiment, the coil uses a magnetic holding mechanism, which can maintain magnetic force for a long time after being energized. However, prolonged energization will generate a large current, potentially burning out the coil. Therefore, the energization time cannot be set too long, while a time that is too short will result in insufficient magnetic force and incomplete pin selection. Thus, it is necessary to test an appropriate energization time to ensure the coil's magnetic force reaches its peak. Based on user testing experience or the performance of electronic devices, this application sets the energization time of the coil to a first duration (this duration can be determined by testing the time required for the coil's magnetic field to reach its peak), and the interval between two energization periods is set to a second duration. For example, when the coil resistance is around 4Ω and a 24V power supply is used, prolonged energization will generate a 6A current. Therefore, a 20µs interval is set between two 200µs energization periods to prevent chip overheating and ensure the magnetic force reaches its peak.
[0044] In summary, the electromagnetic pin selection drive control circuit provided in this application reduces the number of redundant H-bridge circuits and IO interfaces by adopting a half-bridge grouping multiplexing mechanism (such as CP1 / CN1 common half-bridge serving 8 coils in the same group), thereby reducing PCB area and layer requirements, making the circuit board more compact and simplifying circuit design. In addition, the NMOS / PMOS transistor and triode drive scheme is less expensive than the full H-bridge drive and reduces the number of components, thus achieving the effect of reducing hardware costs.
[0045] Secondly, embodiments of this application provide a needle selector, including a microprocessor and an electromagnetic needle selector drive control circuit as described in any of the preceding embodiments, wherein the electromagnetic needle selector drive control circuit is driven by the microprocessor. The operation process of the needle selector in this embodiment refers to the embodiments of the electromagnetic needle selector drive control circuit described above, and therefore will not be described in detail again.
[0046] Thirdly, this application provides a glove machine including the electromagnetic needle selection drive control circuit as described in any of the preceding embodiments. The operation of the glove machine in this embodiment refers to the above-described embodiment of the electromagnetic needle selection drive control circuit, and therefore will not be described in detail again.
[0047] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0048] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.
Claims
1. An electromagnetic needle selection drive control circuit, characterized in that, It includes M first half-bridge circuits and N second half-bridge circuits, which are connected to form a matrix circuit, and each intersection of the matrix is a coil. The first half-bridge circuit is connected between the power supply and the first end of the coil, and the second half-bridge circuit is connected between the power supply and the second end of the coil. The control terminals of the first half-bridge circuit and the second half-bridge circuit are connected to control signals with opposite levels.
2. The electromagnetic needle selection drive control circuit according to claim 1, characterized in that, The first half-bridge circuit or the second half-bridge circuit includes an upper bridge arm and a lower bridge arm; wherein, the upper bridge arm is connected between the positive terminal of the power supply and the first end of the coil; and the lower bridge arm is connected between the first end of the coil and the negative terminal of the power supply. Specifically, when the control terminal receives a first-level signal, the upper bridge arm is turned on and the lower bridge arm is turned off; when the control terminal receives a second-level signal, the upper bridge arm is turned off and the lower bridge arm is turned on.
3. The electromagnetic needle selection drive control circuit according to claim 2, characterized in that, The upper bridge arm includes a first switching transistor; wherein, the control terminal of the first switching transistor is connected to the I / O interface of the microprocessor, the input terminal is connected to the positive terminal of the power supply, and the output terminal is connected to the coil; The lower bridge arm includes a second switching transistor; wherein the control terminal of the second switching transistor is connected to the I / O interface of the microprocessor, the input terminal is connected to the negative terminal of the power supply, and the output terminal is connected to the coil.
4. The electromagnetic needle selection drive control circuit according to claim 3, characterized in that, The upper bridge arm also includes a first resistor, a second resistor, and a third switching transistor; The control terminal of the third switch is connected to a positive voltage, the first resistor is connected between the positive terminal of the power supply and the control terminal of the first switch, and the microprocessor's I / O interface drives the first switch through the second resistor and the third switch.
5. The electromagnetic needle selection drive control circuit according to claim 3, characterized in that, The lower bridge arm also includes a third resistor and a fourth resistor; The microprocessor's I / O interface drives the second switching transistor through the third resistor; the fourth resistor is connected between the negative terminal of the power supply and the control terminal of the second switching transistor.
6. The electromagnetic needle selection drive control circuit according to claim 4, characterized in that, The first switching transistor is a PMOS transistor, the second switching transistor is an NMOS transistor, and the third switching transistor is a triode.
7. The electromagnetic needle selection drive control circuit according to claim 1, characterized in that, M or N is an integer not less than 2.
8. The electromagnetic needle selection drive control circuit according to claim 1, characterized in that, The energizing time of the coil is the first duration, and the interval between two energizing times is the second duration.
9. A needle selector, characterized in that, It includes a microprocessor and an electromagnetic needle selection drive control circuit as described in any one of claims 1 to 8, wherein the electromagnetic needle selection drive control circuit is driven by the microprocessor.
10. A glove-making machine, wherein a computer program is stored thereon, characterized in that, It includes the electromagnetic needle selection drive control circuit as described in any one of claims 1 to 8.