Novel RS485 communication type weighing device circuit

Abstract

The utility model provides a novel RS485 communication type weighing device circuit, and relates to the technical field of elevator weighing circuits, the novel RS485 communication type weighing device circuit comprises an output RS485 communication circuit, an ARM chip and an analog-to-digital conversion circuit, the ARM chip comprises an STM32 single-chip microcomputer, the analog-to-digital conversion circuit comprises an ADS analog-to-digital conversion chip, the analog-to-digital conversion circuit converts an analog quantity signal of a weighing device into a digital quantity signal, and the digital quantity signal is transmitted to the output RS485 communication circuit. The ARM chip obtains a digital quantity signal to carry out function and RS485 protocol communication programming, and the output RS485 communication circuit carries out digital quantity communication; according to the technical key points, after analog quantity signals of the weighing device are converted into digital quantity signals through the analog-to-digital conversion circuit, by means of the characteristic of digital signal differential transmission of the RS485 protocol communication circuit, the influence of noise generated by elevator operation is small, and transmission work of the digital quantity signals can be conveniently and rapidly completed.

Description

Technical Field

[0001] The utility model relates to the technical field of elevator weighing circuits, in particular to a novel RS485 communication type weighing device circuit. Background Art

[0002] An elevator is a permanent transportation device that serves certain floors in a building. Its car runs on at least two rigid rails that are perpendicular to the horizontal plane or inclined at an angle of less than 15° to the plumb line. It serves specified floors. A vertical lift elevator has a car that runs between at least two rigid rails that are perpendicular or inclined at an angle of less than 15°. The elevator weight load controller system plays an important role in the operation of the elevator. The weighing controller consists of two parts, one is the controller part and the other is the weighing sensor part. The weighing sensor converts the weight signal into an electrical signal and sends it to the controller part via a transmission cable. The controller part performs calculations and completes the elevator weighing.

[0003] The elevator weighing device converts the weight signal obtained by the weighing sensor into an electrical signal and transmits it via a cable. During this process, the elevator is pulled by the motor and the steel cable is wound, and the elevator moves up and down, which generates noise around the weighing device. During the operation of the weighing circuit, the circuit signal is easily interfered with, resulting in obstruction of the weighing signal transmission of the weighing device and reduced transmission speed. Utility Model Content

[0004] In order to overcome the shortcomings of the existing elevator weighing device, that is, the elevator is caused by the winding of the steel cable pulled by the motor and the up and down movement of the elevator, which causes noise around the weighing device. During the operation of the weighing circuit, the circuit signal is easily interfered with, resulting in obstruction of the weighing signal transmission of the weighing device and reduced transmission speed. The embodiment of the present application provides a novel RS485 communication weighing device circuit, by making the output RS485 communication circuit communicate with the STM32 single-chip microcomputer, and the RS485 communication chip communicates between the RS485 transceiver and the external system. After the analog-to-digital conversion circuit converts the analog signal of the weighing device into a digital signal, the digital signal transmission work can be completed quickly under the influence of the differential transmission of the digital signal of the RS485 protocol communication circuit, and is less affected by the noise generated by the operation of the elevator, so as to facilitate ensuring the signal transmission speed.

[0005] The technical solution adopted by the embodiment of the present application to solve the technical problem is:

[0006] A novel RS485 communication weighing device circuit comprises an output RS485 communication circuit, an ARM chip and an analog-to-digital conversion circuit. The output RS485 communication circuit communicates with an STM32 single-chip microcomputer via TX / RX, the ARM chip comprises the STM32 single-chip microcomputer, the analog-to-digital conversion circuit comprises an ADS analog-to-digital conversion chip, the analog-to-digital conversion circuit converts an analog quantity signal of a weighing device into a digital quantity signal, the ARM chip obtains the digital quantity signal to perform function and RS485 protocol communication programming, and the output RS485 communication circuit performs digital quantity communication.

[0007] In a possible implementation, the signal output end of the ADS analog-to-digital conversion chip is connected to the signal input end of the ARM chip, the signal output end of the STM32 single-chip microcomputer is connected to the signal input end of the output RS485 communication circuit, the STM32 single-chip microcomputer performs digital processing and control on the overall function of the circuit, burns the completed programming program to the STM32 single-chip microcomputer through the programming interface, and configures the RS485 communication protocol inside the STM32 single-chip microcomputer.

[0008] In one possible implementation, the analog-to-digital conversion circuit includes an analog signal of a load sensor, which is input to AINN1 / AINP1 on the analog signal port of the load sensor, and after being operationally amplified by an ADS analog-to-digital conversion chip, is input to an STM32 microcontroller via a DOUT / SCLK / PDWN / SPEED / GAIN1 / GAIN0 port, and is processed by the STM32 microcontroller in a programmed manner.

[0009] In a possible implementation, the output RS485 communication circuit includes an RS485 communication chip and an RS485 transceiver, the RS485 transceiver has an RS485 transceiver circuit integrated therein, and the RS485 communication chip is connected to the RS485 transceiver circuit on the RS485 transceiver.

[0010] In one possible implementation, the output end of the STM32 single-chip microcomputer is connected to a digital tube display circuit, and the button display part a / b / c / d / e / f / g / h of the STM32 single-chip microcomputer is electrically connected to the weighing and system function status display part of the digital tube display circuit.

[0011] In one possible implementation, the power input end of the ARM chip and the analog-to-digital conversion circuit is connected to a power module, and the power module includes a power supply, a rectifier bridge, a power management chip and a linear voltage regulator chip. The power input end of the power management chip is connected to the power output end of the rectifier bridge and the filter capacitor. The power supply provides AC / DC 24V power to the power module circuit and outputs DC24V through the rectifier bridge and the filter capacitor. The power management chip converts the input DC24V into a 5V power output, and the output 5V power is converted into a 3.3V power by the linear voltage regulator chip.

[0012] In summary, the present invention includes at least one of the following beneficial technical effects:

[0013] By making the output RS485 communication circuit communicate with the STM32 microcontroller, and the RS485 communication chip communicates between the RS485 transceiver and the external system, after the analog-to-digital conversion circuit converts the analog signal of the weighing device into a digital signal, the digital signal transmission work can be completed quickly under the influence of the digital signal differential transmission of the RS485 protocol communication circuit, and is less affected by the noise generated by the elevator operation, which is convenient for ensuring the signal transmission speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is the AD analog-to-digital conversion circuit of the sensor of the utility model;

[0015] Figure 2 This is the digital tube display circuit of the utility model;

[0016] Figure 3 This is the ARM single chip microcomputer circuit of the utility model;

[0017] Figure 4 Output RS485 communication circuit for the utility model;

[0018] Figure 5 This is one of the power supply circuit diagrams of the utility model;

[0019] Figure 6 This is the second power supply circuit diagram of the utility model;

[0020] Figure 7 This is the third power supply circuit diagram of the utility model.

[0021] Description of the drawings: U1, STM32 microcontroller; U2, ADS analog-to-digital conversion chip; U3, RS485 communication chip; U4, linear voltage regulator chip; U5, power management chip; U6, rectifier bridge; C10, filter capacitor; J, load sensor analog signal; PZ, power supply. DETAILED DESCRIPTION

[0022] The technical solution in the embodiment of the present application is to solve the problems of the above-mentioned background technology, and the overall idea is as follows:

[0023] Embodiment 1:

[0024] This embodiment introduces a specific structure of a new RS485 communication type weighing device circuit. Figure 1-Figure 7 As shown, it includes an analog-to-digital conversion circuit, an ARM chip and an output RS485 communication circuit, the ARM chip includes an STM32 single-chip microcomputer U1, the analog-to-digital conversion circuit includes an ADS analog-to-digital conversion chip U2, the analog-to-digital conversion circuit includes a load sensor analog signal J, and the output RS485 communication circuit includes an RS485 communication chip U3 and an RS485 transceiver;

[0025] Among them, the signal output end of the ADS analog-to-digital conversion chip U2 is connected to the signal input end of the ARM chip, and the signal output end of the STM32 microcontroller U1 is connected to the signal input end of the output RS485 communication circuit. The positive level of the RS485 communication circuit is between +2V and +6V, indicating a logic state, and the negative level is between -2V and -6V, indicating another logic state. The digital signal adopts a differential transmission method, which can effectively reduce the interference of noise signals.

[0026] At the same time, the STM32 microcontroller U1 supports high-performance, low-cost, and low-power embedded application design, performs digital processing and control on the overall functions of the circuit, burns the completed programming program through the programming interface, and configures the RS485 communication protocol internally for real-time communication;

[0027] Secondly, the output RS485 communication circuit communicates with the STM32 microcontroller U1 through TX / RX, the RS485 communication chip U3 is electrically connected to the RS485 transceiver, and the RS485 communication chip U3 communicates between the RS485 transceiver and the external system. After the analog-to-digital conversion circuit converts the analog signal of the weighing device into a digital signal, the ARM chip can obtain the digital signal for function and RS485 protocol communication programming, and the output RS485 communication circuit performs digital communication;

[0028] Secondly, if Figure 4 As shown, the analog signal of the load sensor is input to AINN1 / AINP1 on the J port, and after being processed by the ADS analog-to-digital conversion chip U2 for operational amplification, it is input to the STM32 microcontroller U1 through the DOUT / SCLK / PDWN / SPEED / GAIN1 / GAIN0 port, and is processed by the STM32 microcontroller U1 in a programmed manner, which can convert the analog signal obtained by the sensor into a digital signal;

[0029] like Figure 1As shown, the power input end of the ARM chip and the analog-to-digital conversion circuit is connected to a power module, the power module includes a power supply PZ, a rectifier bridge U6, a power management chip U5 and a linear voltage regulator chip U4, and the power input end of the power management chip U5 is connected to the power output end of the rectifier bridge U6 and the filter capacitor C10;

[0030] The power supply PZ provides a 24V DC or AC power supply to the power module circuit. During this process, the rectifier bridge U6 and the filter capacitor C10 convert the AC power supply into a 24V DC power supply.

[0031] At the same time, the power management chip U5 converts the input 24V DC power into 5V power output, and provides working power for analog-to-digital conversion, digital tubes, and RS485 communication. The output 5V power is also converted into 3.3V power by the linear voltage regulator chip U4 to provide support for the operation of the ARM chip U1.

[0032] In some examples, the output end of the STM32 single-chip computer U1 is connected to a digital tube display circuit, and the button display part a / b / c / d / e / f / g / h of the STM32 single-chip computer (U1) is electrically connected to the weighing and system function status display part of the digital tube display circuit;

[0033] Among them, by using the STM32 microcontroller U1 to perform self-learning processing on the weighing signal and system signal, the button display part of the STM32 microcontroller U1 is connected to the digital tube weighing status and system function status display part through a / b / c / d / e / f / g / h, and the weighing status of the elevator can be displayed externally.

[0034] By adopting the above technical solution:

[0035] The above design inputs 24V DC or AC power to the power circuit through the power supply PZ. In this process, the AC power is converted into DC power by the rectifier bridge U6 and the filter capacitor C10, and output to the power management chip. After being processed by the power management chip, a 5V DC power supply is provided to the system circuit, providing energy for the analog-to-digital conversion circuit, the digital tube display circuit, and the output RS485 communication circuit.

[0036] At the same time, the 5V DC power supply is input to the linear voltage regulator chip U4 and outputs a 3.3V power supply to provide energy for the STM32 microcontroller U1.

[0037] When the analog-to-digital conversion circuit, the ARM chip and the output RS485 communication circuit are in working state, the output RS485 communication circuit communicates with the STM32 single-chip computer U1 through TX / RX, so that the RS485 communication chip U3 communicates between the RS485 transceiver and the external system. After the analog-to-digital conversion circuit converts the analog signal of the weighing device into a digital signal, the ARM chip can obtain the digital signal for function and RS485 protocol communication programming, and the output RS485 communication circuit performs digital communication;

[0038] In this process, affected by the digital signal differential transmission of the RS485 protocol communication circuit, during the operation of the elevator, the configured weighing device obtains the weighing data and quickly completes the transmission work. It is less affected by the noise generated by the operation of the elevator, which is conducive to avoiding signal transmission delays.

[0039] Finally, it should be noted that: Obviously, the above embodiments are only examples for clearly explaining the present invention, and are not intended to limit the implementation methods. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from this are still within the scope of protection of the present invention.

Claims

1. A new type of RS485 communication weighing device circuit, characterized in that: include: Output RS485 communication circuit; ARM chips; as well as Analog-to-digital conversion circuit; The output RS485 communication circuit communicates with the STM32 single-chip microcomputer (U1) via TX / RX, the ARM chip includes the STM32 single-chip microcomputer (U1), the analog-to-digital conversion circuit includes an ADS analog-to-digital conversion chip (U2), the analog-to-digital conversion circuit converts the analog quantity signal of the weighing device into a digital quantity signal, the ARM chip obtains the digital quantity signal to perform function and RS485 protocol communication programming, and the output RS485 communication circuit performs digital quantity communication.

2. A novel RS485 communication type weighing device circuit as claimed in claim 1, characterized in that: The signal output end of the ADS analog-to-digital conversion chip (U2) is connected to the signal input end of the ARM chip, and the signal output end of the STM32 single-chip computer (U1) is connected to the signal input end of the output RS485 communication circuit; The STM32 single-chip microcomputer (U1) performs digital processing and control on the overall function of the circuit, burns the completed programming program into the STM32 single-chip microcomputer (U1) through a programming interface, and configures the RS485 communication protocol inside the STM32 single-chip microcomputer (U1).

3. A novel RS485 communication type weighing device circuit as claimed in claim 1, characterized in that: The analog-to-digital conversion circuit comprises an analog signal (J) of a load sensor, which is inputted into an AINN1 / AINP1 port, and after being processed by an ADS analog-to-digital conversion chip (U2) for operational amplification, is inputted into an STM32 single-chip computer (U1) through a DOUT / SCLK / PDWN / SPEED / GAIN1 / GAIN0 port, and is processed by the STM32 single-chip computer (U1) in a programmed manner.

4. A novel RS485 communication type weighing device circuit as claimed in claim 1, characterized in that: The output RS485 communication circuit comprises an RS485 communication chip (U3) and an RS485 transceiver, wherein the RS485 transceiver is internally integrated with an RS485 transceiver circuit, and the RS485 communication chip (U3) is connected to the RS485 transceiver circuit on the RS485 transceiver.

5. A novel RS485 communication type weighing device circuit as claimed in claim 1, characterized in that: The output end of the STM32 single-chip computer (U1) is connected to a digital tube display circuit, and the button display part a / b / c / d / e / f / g / h of the STM32 single-chip computer (U1) is electrically connected to a state display part of a weighing and system function of the digital tube display circuit.

6. A novel RS485 communication type weighing device circuit as claimed in claim 1, characterized in that: The power input end of the ARM chip and the analog-to-digital conversion circuit is connected to a power module, the power module comprises a power supply (PZ), a rectifier bridge (U6), a power management chip (U5) and a linear voltage regulator chip (U4), and the power input end of the power management chip (U5) is connected to the power output end of the rectifier bridge (U6) and the filter capacitor (C10); The power supply (PZ) provides AC / DC 24V power to the power module circuit, and outputs DC24V through a rectifier bridge (U6) and a filter capacitor (C10). The power management chip (U5) converts the input DC24V into a 5V power output, and the output 5V power is converted into a 3.3V power by the linear voltage regulator chip (U4).

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