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Control circuit based on prolonging service lives of multiple electrochemical sensors

A control circuit and life extension technology, applied in the direction of material electrochemical variables, can solve the problems of short service life of chemical sensors, achieve good universality, prolong life, and accurate circuit delay

Inactive Publication Date: 2012-09-12
NORTH CHINA UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] 1. Purpose: The purpose of the present invention is to provide a multi-channel control circuit for extending the life of electrochemical sensors, which can effectively solve the problem of short service life of chemical sensors

Method used

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  • Control circuit based on prolonging service lives of multiple electrochemical sensors
  • Control circuit based on prolonging service lives of multiple electrochemical sensors
  • Control circuit based on prolonging service lives of multiple electrochemical sensors

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Embodiment Construction

[0014] Specific embodiments of the present invention are described in detail below in conjunction with accompanying drawing:

[0015] The control principle block diagram of the present invention is as figure 1 As shown, the control circuit periodically powers up each sensor under the control of the MCU (Atmega128). The base of the triode is connected to an I / O of the MCU (Atmega128) through a resistor, and the MCU (Atmega128) can control the conduction of the triode by controlling the level of the I / O. The collector of the NPN transistor of model 9013 is connected to the 2nd or 4th pin of the MOS switch SI9947DY, which is the gate of the MOS tube, and the 1st and 3rd pins of the SI9947DY (the source of the MOS tube) are connected to To the SVCC, the 5th, 6th or 7th, 8th pin (the drain of the MOS tube) is connected to the power port SVCC-1 ~ SVCC-4 of the sensor. Therefore, the conduction between SVCC and SVCC-1~SVCC-4 can be controlled by using the switching function of the ...

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Abstract

The invention discloses a control circuit based on prolonging service lives of multiple electrochemical sensors. The control circuit comprises four transistors and four metal oxide semiconductor (MOS) switches. Five power supplies are arranged in the circuit; a power supply SVCC is supplied by a power supply circuit; a power supply SVCC-1, a power supply SVCC-2, a power supply SVCC-3 and a power supply SVCC-4 are used for providing voltage for the sensors and are connected onto four power wires of four sensors; base electrodes of the transistors are respectively connected onto four general input / output (I / O) ports of a microprogrammed control unit (MCU) through resistors; collector electrodes of the transistors are connected to second pins or fourth pins of the MOS switches SI9947DY; the emitting electrodes of the transistors are grounded; third pins of the MOS switches are connected onto the power supply SVCC; fifth pins and sixth pins or seventh pins and eighth pins of the MOS switches are connected to power ports of the sensors; and the power supply SVCC-1, the power supply SVCC-2, the power supply SVCC-3 and the power supply SVCC-4 are connected onto the respective power wires of the four sensors. The control circuit disclosed by the invention is simple in structure; the sensors are controlled by utilizing the general purpose input / output (GPIO) ports of the MCU to power up all the sensors periodically, therefore, the goal of prolonging the service lives of the electrochemical sensors is achieved.

Description

technical field [0001] The invention relates to the application field of the Internet of Things, in particular to a control circuit based on multi-channel electrochemical sensor life extension. Background technique [0002] Electrochemical sensors work by reacting with the measured liquid or gas to generate an electrical signal proportional to the chemical concentration, and are widely used in various occasions. A typical electrochemical sensor consists of a sensing electrode (or working electrode) and a counter electrode separated by a thin electrolytic layer. The gas or liquid to be measured first reacts with the sensor through the tiny capillary opening, and the resistor connected between the two electrodes will generate a current proportional to the concentration of the gas to be measured. Measuring this current determines the gas or liquid concentration. Due to the need for chemical reactions during the working process of the electrochemical sensor, if the sensor is a...

Claims

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Application Information

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IPC IPC(8): G01N27/27
Inventor 李文王晓梅罗学科毛谭
Owner NORTH CHINA UNIVERSITY OF TECHNOLOGY
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