CN221037454U - High-protection CAN isolation magnetic encoder - Google Patents
High-protection CAN isolation magnetic encoder Download PDFInfo
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- CN221037454U CN221037454U CN202321908410.7U CN202321908410U CN221037454U CN 221037454 U CN221037454 U CN 221037454U CN 202321908410 U CN202321908410 U CN 202321908410U CN 221037454 U CN221037454 U CN 221037454U
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Abstract
The utility model is applicable to the technical field of industrial detection, and relates to a high-protection CAN isolation magnetic encoder, which comprises the following components: the device comprises a magnet, a circuit board and a shell, wherein the magnet and the circuit board are arranged in the shell; the circuit board comprises an upper board and a lower board which are in communication connection, wherein the upper board comprises a power supply module, an MCU signal acquisition and processing module, a single-circle magnetic signal detection and processing module and a CAN communication module, and the lower board comprises a plurality of circles of magnetic signal detection and processing modules; the power supply module is provided with a protection module, the protection module comprises an inductor and a TVS tube and is used for clamping the power supply voltage entering the magnetic encoder to an allowable level, and a DC/DC power supply chip is used in combination with the transformer for power supply isolation; and optical coupling isolation is adopted between a CAN controller and a CAN transceiver of the CAN communication module. The utility model has simple structure and strong function, effectively improves the anti-interference capability of the magnetic encoder and enhances the reliability of the magnetic encoder.
Description
Technical Field
The utility model belongs to the technical field of industrial detection, and particularly relates to a high-protection CAN isolation magnetic encoder.
Background
The magnetic encoder is a sensor device for detecting position change by using a magnetic sensitive element, and converts the rotation angle of a shaft into digital quantity or analog quantity, so that the measurement of angle, rotation speed and other physical quantities can be realized. With the continuous development of science and technology, the encoder is widely applied to the fields of aerospace, forklift, motor manufacturing and the like, the magnetic encoder is used as a typical position angle sensor, the anti-interference performance of the magnetic encoder has profound effects on the development of servo drive, a numerical control motor and the military industry and aerospace industry, and therefore, the protection design about the anti-interference capability of the magnetic encoder is the key point of current research, and the prior art temporarily lacks a high protection design scheme about improving the anti-interference capability of the magnetic encoder.
The patent application with the bulletin number of CN213515693U provides a magnetic encoder, which comprises a shell and a rotating shaft, wherein the rotating shaft is rotatably inserted into the shell; the rotating shaft is fixedly provided with a magnetic component, and the shell is internally provided with an MCU chip, a signal output component and a magnetic induction chip; the magnetic induction chip is correspondingly arranged with the magnetic component to generate magnetic field data; the signal output end of the magnetic induction chip is electrically connected with the MCU chip, and the signal output end of the MCU chip is electrically connected with the signal output assembly. The MCU chip is additionally arranged in the shell, so that a foundation is provided for processing magnetic field data of the received magnetic induction chip according to a set program, the type of an output signal is increased, the applicability of the magnetic encoder is improved, but the high-protection design scheme of the magnetic encoder is not recorded, and the research on the anti-interference capability of the magnetic encoder is still lacking.
Therefore, how to provide a high protection design scheme of a magnetic encoder to improve the anti-interference capability of the magnetic encoder is a problem to be solved by those skilled in the art.
Disclosure of utility model
Aiming at the defects of the prior art, the utility model aims to provide a high-protection CAN isolation magnetic encoder so as to solve the problem of poor reliability of the magnetic encoder caused by weak anti-interference capability of the magnetic encoder in the prior art.
In order to solve the technical problems, the utility model adopts the following technical scheme:
The utility model provides a high-protection CAN isolation magnetic encoder, which comprises: the device comprises a magnet, a circuit board and a shell, wherein the magnet and the circuit board are arranged in the shell; the circuit board comprises an upper board and a lower board which are in communication connection, the upper board comprises a power supply module, an MCU signal acquisition and processing module, a single-circle magnetic signal detection and processing module and a CAN communication module, and the lower board comprises a plurality of circles of magnetic signal detection and processing modules; the power supply module is provided with a protection module, the protection module comprises an inductor and a TVS tube, the protection module is used for clamping the power supply voltage entering the magnetic encoder to an allowable level, and a DC/DC power supply chip is used in combination with the transformer in power supply isolation; and an optical coupling isolation is adopted between a CAN controller and a CAN transceiver of the CAN communication module.
Furthermore, the external transmission line of the communication interface of the CAN communication module adopts a shielding twisted pair.
Further, the magnetic encoder comprises three magnets, and the magnets are single-pair N/S magnetic poles.
Further, the shell comprises a shell and a gear box, the magnets are fixed on gears of the gear box, each magnet corresponds to one Hall magnetic induction chip, and the Hall magnetic induction chips are arranged on the circuit board.
Further, the model of the TVS tube is SM1K40CF.
Further, the type of the inductor is SWPA5040S101MT.
Further, the model of the TVS tube is SMBJ36CA.
Compared with the prior art, the high-protection CAN isolation magnetic encoder provided by the utility model has at least the following beneficial effects:
There is a temporary lack of a high protection design for improving the anti-jamming capability of a magnetic encoder. The utility model has simple structure and strong function, and utilizes the extremely fast response time (subnanosecond level) and quite high surge absorption capacity of the inductor and the TVS tube to clamp the power supply voltage entering the encoder to the allowable level so as to achieve the aim of high protection design; based on the general interface design of a conventional CAN bus, an electrical isolation design of the bus is added, and an optical coupling isolation design is added between a CAN controller and a CAN transceiver, so that communication isolation is realized, and the whole magnetic encoder has strong anti-interference capability and high reliability.
Drawings
In order to more clearly illustrate the solution of the utility model, a brief description will be given below of the drawings required for the description of the embodiments, it being apparent that the drawings in the following description are some embodiments of the utility model and that other drawings may be obtained from these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic structural diagram of a high protection CAN isolation magnetic encoder according to an embodiment of the utility model;
FIG. 2 is a schematic diagram of a circuit board structure of a high protection CAN isolation magnetic encoder according to an embodiment of the utility model;
FIG. 3 is a circuit diagram of an anti-interference and protection design of the input end of a power module of a high-protection CAN isolation magnetic encoder according to an embodiment of the utility model;
FIG. 4 is a schematic diagram of an isolated power supply design of a high protection CAN isolated magnetic encoder according to an embodiment of the utility model;
FIG. 5 is a schematic diagram of a CAN-BUS BUS protection design of a high protection CAN isolation magnetic encoder according to an embodiment of the utility model;
And (5) appendage marking: 10-magnet; 20-a circuit board; 201-a power module; 202-an MCU signal acquisition and processing module; 203-a single-turn magnetic signal detection and processing module; 204-CAN communication module; 205-a multi-turn magnetic signal detection and processing module; 206-a protection module; 30-a shell.
Detailed Description
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs; the terms used in the specification are used herein for the purpose of describing particular embodiments only and are not intended to limit the present utility model, for example, the orientations or positions indicated by the terms "length", "width", "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are orientations or positions based on the drawings, which are merely for convenience of description and are not to be construed as limiting the present utility model.
The terms "comprising" and "having" and any variations thereof in the description of the utility model and the claims and the description of the drawings above are intended to cover a non-exclusive inclusion; the terms first, second and the like in the description and in the claims or in the above-described figures, are used for distinguishing between different objects and not necessarily for describing a sequential or chronological order. In the description of the utility model and the claims and the above figures, when an element is referred to as being "fixed" or "mounted" or "disposed" or "connected" to another element, it can be directly or indirectly on the other element. For example, when an element is referred to as being "connected to" another element, it can be directly or indirectly connected to the other element.
Furthermore, references herein to "an embodiment" mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the present utility model. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.
The utility model provides a high-protection CAN isolation magnetic encoder, which is applied to the industrial detection process in a plurality of fields such as the aerospace field, the forklift field, the motor manufacturing field and the like, and comprises the following components:
The device comprises a magnet, a circuit board and a shell, wherein the magnet and the circuit board are arranged in the shell; the circuit board comprises an upper board and a lower board which are in communication connection, wherein the upper board comprises a power supply module, an MCU signal acquisition and processing module, a single-circle magnetic signal detection and processing module and a CAN communication module, and the lower board comprises a plurality of circles of magnetic signal detection and processing modules; the power supply module is provided with a protection module, the protection module comprises an inductor and a TVS tube and is used for clamping the power supply voltage entering the magnetic encoder to an allowable level, and a DC/DC power supply chip is used in combination with the transformer for power supply isolation; and optical coupling isolation is adopted between a CAN controller and a CAN transceiver of the CAN communication module.
The utility model has simple structure and strong function, effectively improves the anti-interference capability of the magnetic encoder and enhances the reliability of the magnetic encoder.
In order to make the person skilled in the art better understand the solution of the present utility model, the technical solution of the embodiment of the present utility model will be clearly and completely described below with reference to the accompanying drawings.
The utility model provides a high-protection CAN isolation magnetic encoder with a programming function and up to 256 circles of detection functions, which is applied to the industrial detection process in a plurality of fields such as the aerospace field, the forklift field, the motor manufacturing field and the like, and is combined with figures 1 to 5, and the high-protection CAN isolation magnetic encoder comprises: the magnetic encoder comprises a magnet 10, a circuit board 20 and a shell 30, wherein the magnet 10 and the circuit board 20 are arranged in the shell 30, the magnet 10 is a single pair of N/S magnetic poles, and three single pairs of magnets with the same specification are used in the magnetic encoder in the embodiment; the circuit board 20 comprises an upper board and a lower board which are in communication connection, wherein the upper board comprises a power module 201, an MCU signal acquisition and processing module 202 (programmable), a single-circle magnetic signal detection and processing module 203 and a CAN communication module 204, and the lower board comprises a plurality of circles of magnetic signal detection and processing modules 205; the power supply module is provided with a protection module 206, and the protection module comprises an inductor and a TVS tube and is used for clamping the power supply voltage entering the magnetic encoder to an allowable level, and a DC/DC power supply chip is used in combination with the transformer for power supply isolation; and optical coupling isolation is adopted between a CAN controller and a CAN transceiver of the CAN communication module.
Specifically, the working power range of the magnetic encoder is 10-40V DC, the magnetic encoder is powered by 24V, the induced voltage (because the large motor is started, the signal cable is too close to the power line, the large lightning current flows into the ground through the lightning rod or through the metal member through the room, the space generates instant electromagnetic change due to the faraday current induction principle, the electromagnetic field change induces two ends of the signal through the magnetic encoder cable to obtain surge voltage, the surge voltage always obtains higher voltage value in a short time, the voltage value can reach up to kv instantly, for example, the voltage value is larger than the voltage limit value of the signal end of the encoder), and the voltage value is far exceeding the bearing range of the magnetic encoder, so that a protection module is added at the power end, the power voltage entering the magnetic encoder is clamped to the allowable level by utilizing the extremely fast response time (sub-level) of the TVS tube and quite high nanosecond absorption capacity and inductance, namely, the power supply for actually powering the magnetic encoder is converted to 3.3V within the normal working range of the magnetic encoder.
Furthermore, the power module protection design core device in the embodiment is a TVS tube and an inductor, the TVS tube, namely a transient suppression diode, is respectively selected from SM1K40CF and SMBJ36CA, which can suppress the surge voltage of 2kV and clamp the voltage to 40V; the inductor is SWPA5040S101MT-100uH, and has the function of delaying the transmission of voltage and providing corresponding time for the rear-end TVS tube.
Furthermore, in the embodiment, based on the general interface design of the conventional CAN bus, the electrical isolation design of the bus is added, firstly, the power isolation design is implemented in the aspect of power supply, in order to realize the small size of the magnetic encoder, a DC/DC power chip with the model of BL9342 is selected for use in combination with a transformer with the model of LPD5030V-154MRC, so that the input voltage is converted into the common voltage of 5V and the isolation voltage of 5V, and the isolation voltage supplies power to the optocoupler isolator and the communication chip for use; secondly, adding an optical coupling isolation design between the CAN controller and the transceiver to realize communication isolation; finally, the protection design of the communication interface of the magnetic encoder, namely that an external transmission cable adopts a shielding twisted pair to inhibit electromagnetic interference, and in order to enhance the reliability of CAN-BUS communication, two end points of a CAN-BUS network are added with terminal matching resistors (120 ohms), the model is CP0080TBC, and the protection design CAN inhibit transient surge voltage of up to 4kv and inhibit signal end reflection.
Further, in this embodiment, the housing 30 includes a casing and a gear box, the 1:256 speed ratio of the magnetic encoder is realized through the gear box, the magnets 10 are fixed on the gear of the gear box, each magnet 10 corresponds to a hall magnetic induction chip, the hall magnetic induction chips are arranged on the circuit board 20, the 256 absolute value magnetic encoder is provided with 3 magnets in total, 1 magnet is arranged in the middle, and simultaneously, the gears with the speed ratio of 1:16 and the speed ratio of 1:256 are all provided with magnets.
Specifically, due to the deviation of structural installation and the existence of various error introducing sources such as machining errors, tool errors, magnetic field deviations of the magnet, and the like, the magnetic encoder introduces an algorithm calibration mode, various nonlinearities caused by the non-ideal magnet and the deviation of structural installation CAN be compensated through the calibration mode, so that the precision of a product is greatly improved, the Hall magnetic induction chip CAN output two paths of sine and cosine analog voltage signals along with the direction change of an externally applied magnetic field, the signals are sent to an analog-to-digital converter after being amplified and filtered by an analog front-end circuit, the amplified sine and cosine signals with digital quantity finally enter a digital signal processor to carry out compensation, calibration and calculation of angles, absolute value digital quantity angle data obtained through calculation are output through the CAN communication module 204, and repeatability errors and precision errors of the encoder are reduced.
Furthermore, in the embodiment, on the basis of meeting the high protection (anti-surge and CAN/power isolation design), the design that the external diameter of the whole machine is 48mm and the internal plate diameter is 42mm is realized, the design layout is compact, and the size is smaller than that of a magnetic encoder in the prior art.
Compared with the prior art, the high-protection CAN isolation magnetic encoder disclosed by the embodiment has the advantage that the high-protection design scheme for improving the anti-interference capability of the magnetic encoder is temporarily lacking. The utility model has simple structure and strong function, and utilizes the extremely fast response time (subnanosecond level) and quite high surge absorption capacity of the inductor and the TVS tube to clamp the power supply voltage entering the encoder to the allowable level so as to achieve the aim of high protection design; based on the general interface design of a conventional CAN bus, an electrical isolation design for the bus is added, and an optical coupling isolation design is added between a CAN controller and a CAN transceiver to realize communication isolation.
It is apparent that the above-described embodiments are merely preferred embodiments of the present utility model, not all of which are shown in the drawings, which do not limit the scope of the utility model. This utility model may be embodied in many different forms, but rather, embodiments are provided in order to provide a thorough and complete understanding of the present disclosure. Although the utility model has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing description, or equivalents may be substituted for elements thereof. All equivalent structures made by the content of the specification and the drawings of the utility model are directly or indirectly applied to other related technical fields, and are also within the scope of the utility model.
Claims (7)
1. A high protection CAN isolated magnetic encoder comprising:
The device comprises a magnet, a circuit board and a shell, wherein the magnet and the circuit board are arranged in the shell;
The circuit board comprises an upper board and a lower board which are in communication connection, the upper board comprises a power supply module, an MCU signal acquisition and processing module, a single-circle magnetic signal detection and processing module and a CAN communication module, and the lower board comprises a plurality of circles of magnetic signal detection and processing modules;
The power supply module is provided with a protection module, the protection module comprises an inductor and a TVS tube, the protection module is used for clamping the power supply voltage entering the magnetic encoder to an allowable level, and a DC/DC power supply chip is used in combination with the transformer in power supply isolation; and an optical coupling isolation is adopted between a CAN controller and a CAN transceiver of the CAN communication module.
2. The high protection CAN isolation magnetic encoder of claim 1 wherein the communication interface external transmission line of the CAN communication module employs shielded twisted pair wires.
3. The high protection CAN isolated magnetic encoder of claim 2, wherein the magnetic encoder comprises three of the magnets, the magnets being a single pair of N/S poles.
4. The high protection CAN isolated magnetic encoder of claim 1, wherein the housing comprises a housing and a gear box, the magnets are fixed on gears of the gear box, each magnet corresponds to one hall magnetic induction chip, and the hall magnetic induction chips are arranged on the circuit board.
5. The high protection CAN isolation magnetic encoder of claim 1, wherein the TVS tube is of the type SM1K40CF.
6. The high protection CAN isolated magnetic encoder of claim 1, wherein the inductor is of the type SWPA5040S101MT.
7. The high protection CAN isolation magnetic encoder of claim 1, wherein the TVS tube is of the type SMBJ36CA.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321908410.7U CN221037454U (en) | 2024-02-18 | 2024-02-18 | High-protection CAN isolation magnetic encoder |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321908410.7U CN221037454U (en) | 2024-02-18 | 2024-02-18 | High-protection CAN isolation magnetic encoder |
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| CN221037454U true CN221037454U (en) | 2024-05-28 |
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| CN202321908410.7U Active CN221037454U (en) | 2024-02-18 | 2024-02-18 | High-protection CAN isolation magnetic encoder |
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| CN (1) | CN221037454U (en) |
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