CN212845584U

CN212845584U - Low-cost analog signal acquisition circuit

Info

Publication number: CN212845584U
Application number: CN202021684597.3U
Authority: CN
Inventors: 张金全; 陈小军; 黄章良; 鲁星华
Original assignee: Guangzhou Robustel Technologies Co ltd
Current assignee: Guangzhou Lubangtong IoT Co Ltd
Priority date: 2020-08-13
Filing date: 2020-08-13
Publication date: 2021-03-30
Anticipated expiration: 2030-08-13

Abstract

The utility model discloses a low-cost analog quantity signal acquisition circuit, including the analog quantity signal input port who is used for voltage analog quantity and current analog quantity signal input, still include and be used for handling the analog quantity signal of input with analog quantity signal input port signal connection and produce the voltage acquisition circuit that the digital quantity signal sent for the treater and be used for current analog quantity signal acquisition and voltage analog quantity signal acquisition switching control's current acquisition circuit with analog quantity signal input port and treater signal connection respectively, current acquisition circuit and voltage acquisition circuit signal connection. Through the utility model discloses can effectively simplify the circuit, improve the reliability, reduce cost.

Description

Low-cost analog signal acquisition circuit

Technical Field

The utility model belongs to analog quantity signal measurement field especially relates to a low-cost analog quantity signal acquisition circuit.

Background

The electric quantity passing through any cross section of the conductor in unit time is scientifically called current intensity, which is called current for short. The voltage is the reason for driving the charge to move directionally to form current. In the electricity production process, in order to improve the production precision and safety, real-time voltage and current are required to be detected. The control is carried out through the measured signals so as to achieve the working purpose. However, the voltage and current measuring circuit and device are usually designed to perform separate measurements through different ports, and the same port cannot satisfy the voltage and current measurements at the same time, so that the operation and use are inconvenient in practical use.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a low-cost analog signal acquisition circuit can effectively simplify the circuit, improves the reliability, reduce cost.

To achieve the object, the present invention provides a low-cost analog signal collecting circuit, which comprises an analog signal input port for inputting voltage analog signals and current analog signals, a voltage collecting circuit connected to the analog signal input port for processing the input analog signals to generate digital signals and sending the digital signals to a processor, and a current collecting circuit respectively connected to the analog signal input port and the processor for switching and controlling the current analog signals and the voltage analog signals, wherein the current collecting circuit is connected to the voltage collecting circuit, the current collecting circuit comprises a fourth resistor connected to the analog signal input port for converting the current analog signals into the voltage analog signals, and the other end of the fourth resistor is connected to a ground wire through a switching control module for switching and controlling the current analog signals and the voltage analog signals, the switching control module is in signal connection with the processor, so that a circuit for acquiring voltage analog quantity and current analog quantity signals through the voltage acquisition circuit is formed.

Preferably, the voltage acquisition circuit includes an amplifier module for amplifying the received analog quantity signal and an analog-to-digital conversion module for converting the processed analog quantity signal into a digital quantity signal and sending the digital quantity signal to the processor, a non-inverting input terminal of the amplifier module is connected to the analog quantity signal input port through a first resistor and is connected to the ground through a fifth resistor, an inverting input terminal of the amplifier module is connected to an output terminal thereof, and an output terminal of the amplifier module is in signal connection with the analog-to-digital conversion module and the processor.

Preferably, a signal input end of the analog-to-digital conversion module is connected with an output end of the amplifier module through a second resistor, a data line end and a control line end of the analog-to-digital conversion module are respectively in signal connection with the processor, and a power supply end of the analog-to-digital conversion module is connected with the control power supply.

Preferably, the analog-to-digital conversion module is connected with the processor through an ICC bus.

Preferably, the switching control module is an MOS transistor, wherein the drain is connected to the fourth resistor, the source is connected to the ground, and the gate is in signal connection with the processor.

Compared with the prior art, the utility model, its beneficial effect lies in:

the utility model discloses in form to gather through voltage acquisition circuit and current acquisition circuit and switch control circuit, realize same port to voltage analog and current analog signal acquisition, can effectively simplify the circuit, improve the reliability, reduce cost. The utility model discloses in can realize voltage analog quantity and current analog quantity signal acquisition's configuration through the selection of resistance, can effectively facilitate the use, save the cost.

Drawings

Fig. 1 is a block diagram of the circuit structure of the present invention;

fig. 2 is a schematic diagram of the circuit structure of the present invention.

Detailed Description

The technical solution of the present invention is described in further detail below with reference to the accompanying drawings, but the scope of the present invention is not limited to the following.

As shown IN FIGS. 1-2, the utility model provides a low-cost analog quantity signal acquisition circuit, including analog quantity signal input port AI _ IN who is used for voltage analog quantity and current analog quantity signal input, still include and be used for processing the analog quantity signal of input with analog quantity signal input port AI _ IN signal connection and produce the voltage acquisition circuit 10 that the digital quantity signal sent for treater 30 and be used for current analog quantity signal acquisition and voltage analog quantity signal acquisition switching control with analog quantity signal input port AI _ IN and treater 30 signal connection respectively current acquisition circuit 20, current acquisition circuit 20 and voltage acquisition circuit 10 signal connection, current acquisition circuit 20 includes and is connected the fourth resistance R4 who is used for converting current analog quantity signal into voltage analog quantity signal with analog quantity signal input port AI _ IN, the other end of fourth resistance R4 is through being used for switching on control current analog quantity signal acquisition and voltage analog quantity signal The switching control module Q1 for signal acquisition switching is connected with the ground wire, and the switching control module Q1 is connected with the processor 30 by signals, so as to form a circuit for acquiring voltage analog quantity and current analog quantity signals through the voltage acquisition circuit 10. The switching control module Q1 is a MOS transistor, in which the drain is connected to the fourth resistor R4, the source is connected to the ground, and the gate is connected to the processor 30.

The voltage acquisition circuit 10 comprises an amplifier module U2 for amplifying the received analog quantity signal and an analog-to-digital conversion module U1 for converting the processed analog quantity signal into a digital quantity signal and sending the digital quantity signal to the processor 30, wherein a non-inverting input terminal of the amplifier module U2 is connected with the analog quantity signal input port AI _ IN through a first resistor R1 and is connected with the ground through a fifth resistor R5, an inverting input terminal of the amplifier module U2 is connected with an output terminal thereof, and an output terminal of the amplifier module U2 is IN signal connection with the analog-to-digital conversion module U1 and the processor 30. A signal input end of the analog-to-digital conversion module U1 is connected to an output end of the amplifier module U2 through a second resistor R2, a data line end and a control line end of the analog-to-digital conversion module U1 are respectively connected to the processor 30 through signals, and a power supply end of the analog-to-digital conversion module U1 is connected to the control power VCC _ ADC. The analog-to-digital conversion block U1 is connected to the processor 30 via an ICC bus.

In this embodiment, when current collection is required, the switching control module Q1 in the current collection circuit 20 is turned on, and current flows through the fourth resistor R4 to form voltage, so that the voltage collection circuit 10 collects a voltage analog signal converted from a current analog signal through the first resistor R1 and the fifth resistor R5, and thus current analog signal and voltage analog signal are collected through the voltage collection circuit 10.

In an embodiment, the processor 30 configures the current test mode to be voltage analog acquisition or current analog signal acquisition; when the voltage analog acquisition mode is configured, the processor 30 controls the switching control module Q1 in the current acquisition circuit 20 to be switched off, the voltage acquisition circuit 10 acquires data, and the processor 30 reads the data acquired by the voltage acquisition circuit 10 for analysis; when the current analog signal acquisition mode is configured, the processor 30 controls the switching control module Q1 in the current acquisition circuit 20 to turn on the voltage analog signal converted from the current analog signal, the voltage acquisition circuit 10 acquires data, and the processor 30 reads the data acquired by the voltage acquisition circuit 10 for analysis, so that the number of ports can be saved, and the cost can be reduced.

The foregoing is merely a preferred embodiment of the invention, it is to be understood that the invention is not limited to the forms disclosed herein, but is not intended to be exhaustive of other embodiments, and is capable of use in various other combinations, modifications, and environments and is capable of changes within the scope of the invention as expressed in the above teachings or as known to the person skilled in the relevant art. But that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention, which is to be limited only by the claims appended hereto.

Claims

1. A low-cost analog quantity signal acquisition circuit comprises an analog quantity signal input port (AI _ IN) used for inputting voltage analog quantity and current analog quantity signals, and is characterized by further comprising a voltage acquisition circuit (10) which is IN signal connection with the analog quantity signal input port (AI _ IN) and is used for processing the input analog quantity signals to generate digital quantity signals and sending the digital quantity signals to a processor (30), and a current acquisition circuit (20) which is respectively IN signal connection with the analog quantity signal input port (AI _ IN) and the processor (30) and is used for current analog quantity signal acquisition and voltage analog quantity signal acquisition switching control, wherein the current acquisition circuit (20) is IN signal connection with the voltage acquisition circuit (10), the current acquisition circuit (20) comprises a fourth resistor (R4) which is connected with the analog quantity signal input port (AI _ IN) and is used for converting the current analog quantity signals into voltage analog quantity signals, the other end of the fourth resistor (R4) is connected with the ground wire through a switching control module (Q1) for conducting switching control of current analog quantity signal acquisition and voltage analog quantity signal acquisition and switching, and the switching control module (Q1) is in signal connection with the processor (30), so that a circuit for acquiring the voltage analog quantity and the current analog quantity signals through the voltage acquisition circuit (10) is formed.

2. A low-cost analog signal acquisition circuit as claimed IN claim 1, wherein the voltage acquisition circuit (10) comprises an amplifier module (U2) for amplifying the received analog signal and an analog-to-digital conversion module (U1) for converting the processed analog signal into a digital signal and sending the digital signal to the processor (30), the non-inverting input terminal of the amplifier module (U2) is connected to the analog signal input port (AI _ IN) through a first resistor (R1) and is connected to the ground through a fifth resistor (R5), the inverting input terminal of the amplifier module (U2) is connected to the output terminal thereof, and the output terminal of the amplifier module (U2) is connected to the analog-to-digital conversion module (U1) and is IN signal connection with the processor (30).

3. A low-cost analog signal acquisition circuit according to claim 2, wherein the signal input terminal of the analog-to-digital conversion module (U1) is connected to the output terminal of the amplifier module (U2) through a second resistor (R2), the data line terminal and the control line terminal of the analog-to-digital conversion module (U1) are respectively connected to the processor (30), and the power supply terminal of the analog-to-digital conversion module (U1) is connected to the control power supply (VCC _ ADC).

4. A low cost analog signal acquisition circuit according to claim 2 or 3, characterized in that the analog-to-digital conversion block (U1) is connected to the processor (30) via an ICC bus.

5. A low cost analog signal acquisition circuit according to claim 1, wherein the switching control module (Q1) is a MOS transistor, wherein the drain is connected to the fourth resistor (R4), the source is connected to ground, and the gate is connected to the processor (30) by signal.