Detection circuit of micro-power consumption resistance transducers

Abstract

The invention relates to a detection circuit of micro-power consumption resistance transducers. The detection circuit of the micro-power consumption resistance transducers comprises a transducer power supply control circuit and a difference analog-digital conversion signal processing circuit, and particularly comprises a dry battery BAT, an audion VT1, a sensitive resistor RT, a precise resistor R1, a current-limiting resistor R2, an analog-digital converter IC1, a microprocessor IC2 and a filter capacitor C1. The positive electrode of the dry battery BAT is connected with the emitting electrode of the audion VT1, the collector electrode of the audion VT1 is connected with one end of the sensitive resistor RT, the power supply end VDD of the analog-digital converter IC1 and the positive input end IN+ of the analog-digital converter IC1, and the other end of the sensitive resistor RT is connected with one end of the precise resistor R1, the negative input end IN- of the analog-digital converter IC1, and the reference voltage end REF of the analog-digital converter IC1. The detection circuit of the micro-power consumption resistance transducers is simple in structure, extremely low in power consumption and high in reliability.

Description

technical field [0001] The invention belongs to the field of industrial measurement and control, and relates to a circuit, in particular to a detection circuit of a micro-power consumption resistance sensor, which is suitable for detection occasions using various sensitive resistances as sensors powered by batteries. Background technique [0002] Various resistance sensors (such as thermistors, hygrosistors, strain resistances, etc.) that are sensitive to various physical quantities or chemical components have been widely used, but many occasions require the use of dry batteries to supply power for a long time, requiring The power consumption of the detection circuit should be as low as possible, so the circuit structure should be as simple as possible. At present, the commonly used detection methods based on the physical quantity or chemical composition of sensitive resistors can be divided into the following categories: one is the bridge or voltage division detection metho...

AI Technical Summary

Problems solved by technology

The common problem of these detection methods is that they all need a precision voltage source or a precision current source, and the circuit structure is relatively complicated, so it is difficult to realize the detection of micro power consumption.

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