Transformer type sensor circuit system

Abstract

The invention discloses a transformer type sensor circuit system which is provided with an oscillation driving circuit. The output end of the oscillation driving circuit is connected with a primary coil of a variable pressure transformer, a secondary coil of the variable pressure transformer is connected with a processing circuit, and the output end of the processing circuit is connected with a first output circuit. The transformer type sensor circuit system is characterized in that the processing circuit is a peak value detection circuit. The invention has the advantages of reducing the number of turns of the coils of the transformer, and realizing miniaturization, low power consumption and low temperature drift of the sensor. The invention has excellent performance, can more conveniently manufacture the transformer type sensor and can be applied to more conditions.

Description

technical field [0001] The invention belongs to the technical field of sensors, in particular to a transformer-type sensor special circuit. Background technique [0002] Differential transformer sensor is a device that converts the measured non-electrical quantity change into the change of coil mutual inductance. This kind of sensor is mainly made according to the principle of transformer. Because this type of sensor has the advantages of simple structure and high sensitivity, it is widely used For displacement measurement. The coil output of the transformer sensor is an AC signal, which needs to be converted and processed by a circuit to be effectively used. The traditional solution is to use a phase-sensitive detection circuit composed of diodes, or a frequency modulation, phase modulation circuit, etc. [0003] However, these circuits still have several significant disadvantages: first, the sensitivity is poor, and a coil with a sufficient number of turns, such as 2000 ...

AI Technical Summary

Problems solved by technology

[0003] However, these circuits still have several significant disadvantages: First, the sensitivity is poor, and a coil with sufficient turns, such as 2000 turns, is required for better processing

The number of turns of the coil is too many, so the size of the sensor cannot be reduced

[0004] Second, the temperature drift is large

The differential structure requires a symmetrical coil structure, which increases the complexity and process difficulty of the sensor, further increases the volume of the sensor, and increases the manufacturing and installation costs of the sensor

[0005] Third, the output curve is single

For other types of output curves, such as exponential and broken lines, it is difficult to achieve

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