A Self-Induction Piezoelectric Drive Circuit Based on Feedforward Adaptive Compensation

Abstract

The invention discloses a self-inductive piezoelectric driving circuit based on feed-forward adaptive compensation, which retains the structure of the traditional bridge-type self-inductive driving circuit, relaxes the requirement that the matching capacitance is strictly equal to the equivalent capacitance of the piezoelectric material, and allows the matching capacitance to deviate from the equivalent capacitance in a certain range. Taking the mean square value of the error signal as the objective function and updating the gain of the digital potentiometer according to the iterative formula,the error signal will converge to the minimum value, which shows that the self-induction driving circuit with feed-forward compensation can completely eliminate the influence of the bridge imbalancein theory, especially under the condition that the temperature varies in a large range; Aiming at the condition that the equivalent capacitance of piezoelectric material is sensitive to temperature change, the error signal caused by temperature change can be compensated on-line, which can be widely used in vibration control, position control and structure monitoring, and is conducive to the commercial and practical development of self-inductive piezoelectric actuators.

Description

technical field [0001] The invention relates to the technical field of measurement and control, in particular to a self-induction piezoelectric drive circuit based on feedforward adaptive compensation. Background technique [0002] The positive and inverse piezoelectric effects of piezoelectric materials can be used to make sensors and drivers of mechanical structures respectively, and have good linear relationship and large frequency response width. In practical applications, the lower piezoelectric sensors and piezoelectric drivers are generally manufactured separately and placed in different positions. US5347870 proposes a bridge-type self-induction piezoelectric drive circuit that enables piezoelectric materials to simultaneously extract induction signals under the direct piezoelectric effect and the inverse piezoelectric effect. The application of the self-inductive piezoelectric piezoelectric drive circuit can integrate the piezoelectric sensor and the piezoelectric d...

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a self-induction piezoelectric drive circuit based on feed-forward adaptive compensation, which can solve the problem of induced voltage measurement error caused by the mismatch of the piezoelectric equivalent capacitance in the traditional self-induction piezoelectric drive circuit. question

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