CN216977926U

CN216977926U - RS485 communication based power-off memory absolute encoder

Info

Publication number: CN216977926U
Application number: CN202220068501.3U
Authority: CN
Inventors: 李志伟; 阮彩秾
Original assignee: Zhuhai Yiyao Technology Co ltd
Current assignee: Zhuhai Yiyao Technology Co ltd
Priority date: 2022-01-11
Filing date: 2022-01-11
Publication date: 2022-07-15
Anticipated expiration: 2032-01-11

Abstract

The utility model discloses an RS485 communication based power-off memory absolute encoder in the technical field of electric control, which comprises a micro-control single chip microcomputer, wherein a communication interface is connected to the micro-control single chip microcomputer, a data memory is connected to the micro-control single chip microcomputer, and an input voltage detector is connected to the micro-control single chip microcomputer. The beneficial effects of the utility model are: through setting for the threshold value to input voltage detector in advance, and then detect the voltage of input, when input voltage is less than the threshold value or cuts off the power supply, then start stand-by power supply through the micro-control singlechip is super capacitor and power module be the circuit power supply, guarantee that the device can normally operate an end time under the circumstances such as input voltage low and outage, and then record the current feedback of encoder through data memory and memory chip, when break-make or input voltage reach and set for more than the threshold value, then read encoder outage parking position and resume through micro-control singlechip and timer, realize the outage memory function of encoder.

Description

RS485 communication based power-off memory absolute encoder

Technical Field

The utility model relates to the technical field of electric control, in particular to an RS485 communication based outage memory absolute encoder.

Background

An encoder is a device that compiles, converts, and communicates signals (e.g., bitstreams) or data into a form of signals that can be used for communication, transmission, and storage. The encoder converts angular displacement or linear displacement, called code wheel, into an electrical signal, called code scale. The encoder can be divided into a contact type and a non-contact type according to a reading mode; encoders can be classified into incremental encoders and absolute encoders according to their operation principles. The incremental encoder converts displacement into periodic electric signal, converts the electric signal into counting pulse, and expresses the displacement by the number of the pulse. Each position of the absolute encoder corresponds to a specific digital code, so that its representation is dependent only on the start and end positions of the measurement and not on the intermediate course of the measurement

Most encoders on the market all standard type encoder does not possess outage memory function at present, if take place unexpected outage or input voltage when the circumstances such as low excessively in encoder working process, then can lead to encoder stop work, simultaneously when the secondary start, can lead to encoder to lose operating position and behavior last time, and then increase equipment when the secondary start, need return to zero just can use, time when increasing equipment secondary start, direct influence in service behavior.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide an RS485 communication-based power-off memory absolute encoder to solve the problems in the background technology.

In order to achieve the purpose, the utility model provides the following technical scheme: the utility model provides an absolute encoder based on RS485 communication outage memory, includes the micro-control singlechip, be connected with communication interface on the micro-control singlechip, be connected with data memory on the micro-control singlechip, connect input voltage detector on the micro-control singlechip, be connected with super capacitor on the micro-control singlechip, be connected with the encoder on the micro-control singlechip, encoder and three-phase electricity output connection, super capacitor is connected with power module, power module is connected with the PCB board, be provided with the distribution network on the PCB board.

As a further scheme of the utility model: the data memory is electrically connected with a storage chip, the current position is stored when the power is off through the data memory and the storage chip, when the power is on again, the feedback position of the magnetic code can be read through a timer on the micro-control single chip microcomputer, and the current position data is stored when the position is judged not to be changed.

As a still further scheme of the utility model: the communication interface is an RS485 communication interface, and through the RS485 communication interface bus scheme, a plurality of slave machines can be controlled through one host machine, so that the application range of the product can be effectively enlarged.

As a still further scheme of the utility model: the super capacitor and the power module are both provided with one, and when the device is powered off, the super capacitor and the power module provide electric energy to ensure that the micro-control single chip can continuously operate.

As a still further scheme of the utility model: the micro-control single chip microcomputer is provided with a timer, the micro-control single chip microcomputer is electrically connected with the timer, the timer reads the feedback position of the magnetic code after power failure recovery, and the current position data is stored when the position is judged not to change.

As a still further scheme of the utility model: the input voltage detector is provided with a threshold, the threshold is equal to the lowest operation required voltage of the encoder, the voltage detector judges whether the input voltage meets the system operation voltage or not through the threshold, if not, the standby power supply is started, and if so, no action is taken.

Compared with the prior art, the utility model has the beneficial effects that: the utility model sets a threshold value for an input voltage detector in advance to detect the input voltage, when the input voltage is lower than the threshold value or is cut off, a backup power supply, namely a super capacitor and a power supply module, is started by a micro-control single chip microcomputer to supply power to a circuit, so that the device can normally run for a period of time under the conditions of too low input voltage, power failure and the like, current feedback of an encoder is recorded by a data memory and a storage chip, and when the input voltage is switched on or switched off or the input voltage reaches above the set threshold value, the power failure stop position of the encoder is read and recovered by a timer of the micro-control single chip microcomputer, so that the power failure memory function of the encoder is realized.

Drawings

FIG. 1 is a schematic view of the process structure of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1, in an embodiment of the present invention, an RS485 communication-based power-off memory absolute encoder includes a micro-control single chip, a communication interface is connected to the micro-control single chip, a data storage is connected to the micro-control single chip, an input voltage detector is connected to the micro-control single chip, a super capacitor is connected to the micro-control single chip, an encoder is connected to the micro-control single chip, the encoder is connected to an output of a rotating shaft of a motor, the super capacitor is connected to a power module, the power module is connected to a PCB board, and a distribution network is disposed on the PCB board.

The data storage device is electrically connected with the storage chip, the current position is stored when the power is off through the data storage device and the storage chip, when the power is on again, the feedback position of the magnetic code can be read through the timer on the micro-control single chip microcomputer, and the current position data is stored when the position is judged not to be changed. The communication interface is an RS485 communication interface, and through the RS485 communication interface bus scheme, a plurality of slave machines can be controlled through one host machine, so that the application range of the product can be effectively enlarged. The super capacitor and the power module are both provided with one, and when the device is powered off, the super capacitor and the power module provide electric energy to ensure that the micro-control single chip can continuously operate. The micro-control single chip microcomputer is provided with a timer, the micro-control single chip microcomputer is electrically connected with the timer, the timer reads the feedback position of the magnetic code after power failure recovery, and the current position data is stored when the position is judged not to change. The input voltage detector is provided with a threshold, the threshold is equal to the lowest operation required voltage of the encoder, the voltage detector judges whether the input voltage meets the system operation voltage or not through the threshold, if not, the standby power supply is started, and if yes, no action is performed.

In this embodiment, the micro-control single chip is also referred to as a control unit, the micro-control single chip is connected with the encoder through a control bus, communication between the micro-control single chip and the encoder is completed through software, a timer is further connected between the micro-control single chip and the encoder, the micro-control single chip can read the feedback position of the encoder through the timer, and the address of the encoder can be set through a connection pin of the bus, so that a plurality of encoders can be connected on one control bus. Thereby increasing the number of the micro-control single chip microcomputer controlled slave machines. The input voltage detector is also called an A/D converter and is used for periodically monitoring the input voltage of the device, when the input voltage of the device is lower than a set threshold value of the micro-control single chip microcomputer, an alarm is sent to the micro-control single chip microcomputer, the super capacitor starts to supply power, the micro-control single chip microcomputer receives feedback of each encoder, meanwhile, the data storage device records the current operation position of the encoder, and the data storage device is connected with a plurality of EPROMs and is used for storing encoder feedback data recorded by the micro-control single chip microcomputer. After the input voltage is recovered to be stable, the micro-control single chip microcomputer reads the position record which is stored last time through the data storage device, and therefore the position of the encoder is recovered. The power supply module comprises a storage battery, a power supply output module and a power supply input module, and when the input voltage is recovered to be above the set threshold value of the micro-control single chip microcomputer, the power supply input module supplements electric energy to the storage battery and the capacitor.

The working principle of the utility model is as follows: the device is designed by key components such as a micro-control single chip microcomputer, a data memory, a power supply module, a magnetic angle encoder, a super capacitor and the like, a communication control part adopts an RS485 bus scheme, and based on the characteristics of an RS485 communication bus, the function that one host controls a plurality of auxiliary machines is realized, the application range of products can be improved, and the input slave cost is reduced. When the circuit is used, a threshold value is set on the input power supply detector according to the working voltage of the circuit, the threshold value is larger than the working voltage of the circuit, when the input circuit is suddenly powered off or the input voltage is too low, the voltage is monitored by the input voltage monitor, when the input voltage is detected to be lower than the threshold value, the circuit is judged to be powered off, the micro-control single chip microcomputer starts the standby power supply, namely the super capacitor and the power module supply power the equipment, and the circuit can continue to work for a period of time under the condition of power off. When the standby power supply is started, the current position and the angle of the magnetic angle encoder are recorded and stored through the data storage. When the input power supply monitor detects that the input power supply is higher than the threshold value, the input voltage is judged to be recovered, and the normal operation can be realized. At the moment, the feedback position of the magnetic code is read by the timer, and the working position and the angle of the magnetic code before power failure are recovered by the micro-control singlechip. And meanwhile, after the input voltage is higher than the threshold value, the standby power supply starts to charge and is prepared for the next starting of the standby power supply.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and equivalent alternatives or modifications according to the technical solution of the present invention and the inventive concept thereof should be covered by the scope of the present invention.

Claims

1. The utility model provides an absolute encoder based on RS485 communication outage memory, includes micro-control singlechip, its characterized in that: the system comprises a micro-control single chip microcomputer, and is characterized in that a communication interface is connected to the micro-control single chip microcomputer, a data memory is connected to the micro-control single chip microcomputer, an input voltage detector is connected to the micro-control single chip microcomputer, a super capacitor is connected to the micro-control single chip microcomputer, an encoder is connected to the micro-control single chip microcomputer, the encoder is connected with a three-phase power output, the super capacitor is connected with a power module, the power module is connected with a PCB, and a distribution network is arranged on the PCB.

2. The RS485 communication based power-off memory absolute encoder according to claim 1, wherein: the data memory is electrically connected with a memory chip.

3. The RS485 communication based power-off memory absolute encoder according to claim 1, wherein: the communication interface is an RS485 communication interface.

4. The RS485 communication based power-off memory absolute encoder according to claim 1, wherein: and the super capacitor and the power module are respectively provided with one.

5. The RS485 communication based power-off memory absolute encoder according to claim 1, wherein: the micro-control single chip microcomputer is provided with a timer, and the micro-control single chip microcomputer is electrically connected with the timer.

6. The RS485 communication based power-off memory absolute encoder according to claim 1, wherein: the input voltage detector is provided with a threshold equal to the minimum required operating voltage of the encoder.