Analog quantity input circuit using digital isolation and conditioning technology

A technology of input circuit and analog quantity, applied in the direction of logic circuit connection/interface layout, data exchange through path configuration, bus network, etc., can solve the problems of heavy calibration workload, affecting the long-term stability of the channel, etc., and achieve high performance and price Ratio, simple and reliable structure, to achieve the effect of digital correction and linearization

Inactive Publication Date: 2011-04-20
FUZHOU UNIVERSITY
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

The calibration workload is large, and it is easy to affect the long-ter

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  • Analog quantity input circuit using digital isolation and conditioning technology
  • Analog quantity input circuit using digital isolation and conditioning technology
  • Analog quantity input circuit using digital isolation and conditioning technology

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[0009] refer to figure 1 and figure 2 , an analog input circuit using digital isolation and conditioning technology, characterized in that it includes a control logic circuit (1), an optocoupler (2), a sigma-delta mode A / D converter with a programmable amplifier (3 ), an input processing circuit (4), a built-in cold junction temperature sensor (5), a serial EEPROM (6) and a DC / DC power converter (7), the output of the input processing circuit (4) being connected to a Σ-Δ The program-controlled amplifier (3-1) of the mode A / D converter (3) is connected, and the output end of the program-controlled amplifier (3-1) is connected to the A / D converter of the sigma-delta mode A / D converter (3). (3-2) connection, the output end of the A / D converter (3-2) is connected to the photocoupler (2), and the output end of the photoelectric coupler (2) is connected to the control logic circuit (1) , the output of the DC / DC power converter (7) is connected with a sigma-delta mode A / D converte...

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Abstract

The invention relates to an analog quantity input circuit using digital isolating and conditioning technology, and is characterized in that the analog quantity input circuit comprises a control logic circuit, a photoelectric coupler, a Sigma-Delta mode A/D converter with a program control amplifier, an input processing circuit, a built-in cold-end temperature sensor, a serial EEPROM and a DC/DC power converter; the output end of the input processing circuit is connected with the program control amplifier of the Sigma-Delta mode A/D converter; the output end of the program control amplifier is connected with the A/D converter of the Sigma-Delta mode A/D converter; the output end of the A/D converter is connected with the photoelectric coupler; and the output end of the photoelectric coupler is connected with the control logic circuit. The analog quantity input circuit has simple and reliable structure by using a photoelectrically isolated SPI data interface, realizes complete electric isolation between channels and control device among each channel, and realizes digital correction and linearization of input channel error, thereby having high cost performance and providing great convenience for the user using automation control devices.

Description

technical field [0001] The invention relates to an analog quantity input circuit using digital isolation and conditioning technology, and belongs to the technical field of automatic device manufacturing. Background technique [0002] The automation control equipment needs to detect the field signal from the control object, so the automation control equipment is electrically connected with various sensors installed on the control object. This will often introduce a lot of electrical interference signals, which may have a negative impact on the automation control equipment, making data sampling inaccurate, and the automation control equipment working unstable or even damaged. In order to overcome these electrical interferences, channel isolation technology is used to isolate these electrical interferences. There are two isolation techniques commonly used for analog input signals: analog side isolation and digital side isolation. Analog side isolation adopts analog signal iso...

Claims

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Application Information

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IPC IPC(8): H03K19/0175H04L12/40
Inventor 吴景东
Owner FUZHOU UNIVERSITY
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