CN220492981U

CN220492981U - ADC long-distance transmission anti-interference circuit

Info

Publication number: CN220492981U
Application number: CN202321696284.3U
Authority: CN
Inventors: 邓俊杰; 顾长亮
Original assignee: Dongguan Yiyun Information System Co ltd
Current assignee: Dongguan Yiyun Information System Co ltd
Priority date: 2023-06-29
Filing date: 2023-06-29
Publication date: 2024-02-13
Anticipated expiration: 2033-06-29

Abstract

The embodiment of the utility model discloses an ADC remote transmission anti-interference circuit, which comprises: the device comprises a main control unit, a digital-to-analog conversion unit and a signal reforming unit; the digital-to-analog conversion unit is used for converting the analog voltage to be tested of the product into a digital signal; the signal reforming unit is used for reforming the interfered digital signal into a digital signal with a standard shape and converting the digital signal into a measured analog voltage signal; the main control unit is used for receiving the analog voltage signal to be tested. By implementing the circuit of the embodiment of the utility model, the GPIO detected by the ADC and the detected voltage can be transmitted in a long distance, and the anti-interference performance is stronger.

Description

ADC long-distance transmission anti-interference circuit

Technical Field

The utility model relates to the technical field of ADC transmission circuits, in particular to an ADC long-distance transmission anti-interference circuit.

Background

When the MCU collects the target voltage through the ADC (analog-to-digital converter, analog to Digital Converter), the conventional scheme is to reduce the distance between the detected voltage and the GPIO port detected by the ADC as much as possible during layout of layout wires, so as to reduce the risk of doping other interference signals. However, in some special cases, the distance between the GPIO detected by the ADC and the detected voltage cannot be shortened from the layout design, and the prior art cannot be used for anti-interference transmission.

Therefore, it is necessary to design a new circuit to realize that the GPIO detected by the ADC and the detected voltage are transmitted over a long distance, and the interference immunity is strong.

Disclosure of Invention

The utility model aims to provide an ADC long-distance transmission anti-interference circuit.

In order to solve the technical problems, the aim of the utility model is realized by the following technical scheme: provided is an ADC long-distance transmission anti-interference circuit, comprising: the device comprises a main control unit, a digital-to-analog conversion unit and a signal reforming unit; the digital-to-analog conversion unit is used for converting the analog voltage to be tested of the product into a digital signal; the signal reforming unit is used for reforming the interfered digital signal into a digital signal with a standard shape and converting the digital signal into a measured analog voltage signal; the main control unit is used for receiving the analog voltage signal to be tested.

The further technical scheme is as follows: the main control unit comprises a main control chip U15.

The further technical scheme is as follows: the model of the main control chip U15 is HC32F4A0.

The further technical scheme is as follows: the digital-to-analog conversion unit comprises a digital-to-analog conversion chip U8.

The further technical scheme is as follows: the model of the digital-to-analog conversion chip U8 is AD0809.

The further technical scheme is as follows: the signal reforming unit includes a DAC chip U24.

The further technical scheme is as follows: the model of the DAC chip U24 is AD8600.

The further technical scheme is as follows: the main control chip U15 is also connected with an oscillator X5.

The further technical scheme is as follows: the main control chip U15 is also connected with a reference voltage module; the reference voltage module comprises an inductor FB5, a resistor R39 and a resistor R40 which are connected in sequence; the resistor R40 is connected with the main control chip U15.

The further technical scheme is as follows: the reference voltage module further comprises a filter capacitor C182, a filter capacitor C184, a filter capacitor C183 and a filter capacitor C181, wherein one end of the filter capacitor C182 is grounded.

Compared with the prior art, the utility model has the beneficial effects that: according to the utility model, a main control unit, a digital-to-analog conversion unit and a signal reforming unit are arranged, and the digital-to-analog conversion unit is utilized to convert the measured analog voltage of the product into a digital signal; the signal reforming unit reforms the interfered digital signal into a digital signal with a standard shape and converts the digital signal into a tested analog voltage signal, so that GPIO detected by the ADC and the tested voltage are transmitted in a long distance, and the anti-interference performance is strong.

The utility model is further described below with reference to the drawings and specific embodiments.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic block diagram of an ADC remote transmission anti-interference circuit according to an embodiment of the present utility model;

fig. 2 is a schematic circuit diagram of an ADC remote transmission anti-interference circuit according to an embodiment of the present utility model;

the figure identifies the description:

10. a main control unit; 20. a digital-to-analog conversion unit; 30. a signal reforming unit; 40. and (5) a product.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be understood that the terms "comprises" and "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.

It is also to be understood that the terminology used in the description of the utility model herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. As used in this specification and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

It should be further understood that the term "and/or" as used in the present specification and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes such combinations.

Referring to fig. 1, fig. 1 is a schematic block diagram of an ADC remote transmission anti-interference circuit according to an embodiment of the present utility model, which can be applied to a product 40 requiring ADC remote transmission, so that GPIO detected by the ADC and detected voltage are transmitted in a remote distance, and the anti-interference performance is strong.

Referring to fig. 1, an ADC remote transmission anti-interference circuit described above includes: a main control unit 10, a digital-to-analog conversion unit 20, and a signal reforming unit 30; the digital-to-analog conversion unit 20 is used for converting the measured analog voltage of the product 40 into a digital signal; a signal reforming unit 30 for reforming the disturbed digital signal into a digital signal of a standard shape and converting into a measured analog voltage signal; the main control unit 10 is configured to receive the analog voltage signal to be measured.

The digital-to-analog conversion unit 20 and the signal reforming unit 30 are adopted to realize the purpose of anti-interference ADC long-distance transmission.

In an embodiment, referring to fig. 2, the master control unit 10 includes a master control chip U15.

In an embodiment, referring to fig. 2, the model of the master control chip U15 is HC32F4A0.

In an embodiment, referring to fig. 2, the digital-to-analog conversion unit 20 includes a digital-to-analog conversion chip U8.

In an embodiment, referring to fig. 2, the digital-to-analog conversion chip U8 is of the type AD0809.

In one embodiment, referring to fig. 2, the signal reforming unit 30 includes a DAC chip U24.

In an embodiment, referring to fig. 2, the type of the DAC chip U24 is AD8600.

Specifically, the master unit 10 needs to perform ADC detection on the analog voltage signals vccq_1v2, vcc_3v3, vccdq_1v5, vdd_0v9 and current_detect of the product 40. The analog voltage signal to be detected of the product 40 is converted into a plurality of digital signals with only high and low levels by the digital-to-analog conversion unit 20, and then the digital signals are serially and remotely transmitted to the input end of the signal reforming unit 30 by the output of the digital-to-analog conversion unit 20. The digital-to-analog conversion unit 20 and the signal reforming unit 30 are remotely transmitted by digital signals, wherein the high level industry of the digital signals is defined as the chip operating voltage which is more than or equal to 70%, and the low level industry is defined as the chip operating voltage which is less than or equal to 30%. When a plurality of digital signals are serially transmitted over a long distance, even if an external disturbance signal greatly disturbs the plurality of digital signals during the long distance transmission, the signal reaches the signal reforming unit 30, and then the plurality of digital signals deformed by the disturbance are reformed into a digital signal of a standard shape. The signal reforming unit 30 converts the reformed plurality of digital signals into the measured analog voltage at this time, and finally transmits the analog voltage to the ADC detection GPIO port of the main control unit 10 close to the signal of the signal reforming unit 30. Realize the long-distance transmission of ADC acquisition signals and improve the anti-interference performance

In an embodiment, referring to fig. 2, the main control chip U15 is further connected to an oscillator X5.

In an embodiment, referring to fig. 2, the main control chip U15 is further connected to a reference voltage module; the reference voltage module comprises an inductor FB5, a resistor R39 and a resistor R40 which are connected in sequence; the resistor R40 is connected with the main control chip U15.

In an embodiment, referring to fig. 2, the reference voltage module further includes a filter capacitor C182, a filter capacitor C184, a filter capacitor C183, and a filter capacitor C181, which are grounded at one end.

According to the ADC remote transmission anti-interference circuit, the main control unit 10, the digital-to-analog conversion unit 20 and the signal reforming unit 30 are arranged, and the digital-to-analog conversion unit 20 is utilized to convert the measured analog voltage of the product 40 into a digital signal; the signal reforming unit 30 reforms the interfered digital signal into a digital signal of a standard shape and converts the digital signal into a detected analog voltage signal, so that the GPIO detected by the ADC and the detected voltage are transmitted in a long distance, and the interference immunity is strong.

While the utility model has been described with reference to certain preferred embodiments, it will be understood by those skilled in the art that various changes and substitutions of equivalents may be made and equivalents will be apparent to those skilled in the art without departing from the scope of the utility model. Therefore, the protection scope of the utility model is subject to the protection scope of the claims.

Claims

1. An ADC remote transmission anti-interference circuit, comprising: the device comprises a main control unit, a digital-to-analog conversion unit and a signal reforming unit; the digital-to-analog conversion unit is used for converting the analog voltage to be tested of the product into a digital signal; the signal reforming unit is used for reforming the interfered digital signal into a digital signal with a standard shape and converting the digital signal into a measured analog voltage signal; the main control unit is used for receiving the analog voltage signal to be tested.

2. The ADC remote transmission anti-interference circuit according to claim 1, wherein the main control unit comprises a main control chip U15.

3. The ADC remote transmission anti-interference circuit according to claim 2, wherein the model number of the main control chip U15 is HC32F4A0.

4. The ADC remote transmission interference-free circuit according to claim 1, wherein the digital-to-analog conversion unit comprises a digital-to-analog conversion chip U8.

5. The ADC remote transmission interference-free circuit according to claim 4, wherein said digital-to-analog conversion chip U8 is of a type AD0809.

6. The ADC remote transmission immunity circuit according to claim 1, wherein said signal reforming unit comprises a DAC chip U24.

7. The ADC remote transmission immunity circuit according to claim 6, wherein said DAC chip U24 is model AD8600.

8. The ADC remote transmission anti-interference circuit according to claim 2, wherein the main control chip U15 is further connected to an oscillator X5.

9. The ADC remote transmission anti-interference circuit according to claim 2, wherein the main control chip U15 is further connected with a reference voltage module; the reference voltage module comprises an inductor FB5, a resistor R39 and a resistor R40 which are connected in sequence; the resistor R40 is connected with the main control chip U15.

10. The ADC remote transmission anti-interference circuit according to claim 9, wherein the reference voltage module further comprises a filter capacitor C182, a filter capacitor C184, a filter capacitor C183, and a filter capacitor C181, which are grounded at one end.