Wide-band piezoelectric ceramics driving power source

Abstract

The present invention provides a broadband piezoelectric ceramics driving power supply which includes power supply units, a microcontroller controlling unit connected in turn and a multiple grade amplification unit, the power supply units are separately connected with the microcontroller unit, the liquid crystal displaying unit, the DA conversion unit and the multiple grade amplification unit, the multiple grade amplification unit includes an anterior grade amplification module connected with the DA conversion unit and a power amplifier module connected with the anterior grade amplification module, the power amplifier module is connected with the piezoelectric ceramics, the feedback resistance of the multiple grade amplification unit is paralleled with the compensating capacitor, the same phase input end and the reversed phase input end of the multiple grade amplification unit are serially connected with compensation resistances and compensation capacitors. Through testing, the present invention is provided with a piezoelectric ceramics driving power supply with a ten thousand hertz effective bandwidth, the response frequency can reach 4.4 KHZ with a 10 u load, the stable time of the step response is about 40 mu s, the dynamic performance, the response time and the loading ability of the power supply are all improved significantly. The present invention provides a broadband piezoelectric ceramics driving power supply which includes power supply units, a microcontroller controlling unit connected in turn and a multiple grade amplification unit, the power supply units are separately connected with the microcontroller unit, the liquid crystal displaying unit, the DA conversion unit and the multiple grade amplification unit, the multiple grade amplification unit includes an anterior grade amplification module connected with the DA conversion unit and a power amplifier module connected with the anterior grade amplification module, the power amplifier module is connected with the piezoelectric ceramics, the feedback resistance of the multiple grade amplification unit is paralleled with the compensating capacitor, the same phase input end and the reversed phase input end of the multiple grade amplification unit are serially connected with compensation resistances and compensation capacitors. Through testing, the present invention is provided with a piezoelectric ceramics driving power supply with a ten thousand hertz effective bandwidth, the response frequency can reach 4.4 KHZ with a 10 u load, the stable time of the step response is about 40 mu s, the dynamic performance, the response time and the loading ability of the power supply are all improved significantly.

Description

(1) Technical field [0001] The invention relates to the technical field of driving power, in particular to a driving power of a piezoelectric ceramic micro-displacement device. (2) Background technology [0002] The piezoelectric ceramic micro-displacement device has the characteristics of small size, high displacement resolution, high frequency response, no noise, no heat, etc., and is an ideal micro-displacement element. With the continuous development of science and technology, the scope of our research has also developed from the macrocosm to the microcosm, and the piezoelectric ceramic driver just meets the needs of this development, so all countries in the world are competing to develop piezoelectric ceramic drive power technology. Research. The driving methods of piezoelectric ceramics widely studied at present mainly include voltage driving and current driving. The current drive method has good open-loop control linearity, strong load capacity, and wide frequency b...

AI Technical Summary

Problems solved by technology

The current drive method has good open-loop control linearity, strong load capacity, and wide frequency band, but poor low-frequency stability, and there are problems such as charge leakage, output voltage saturation, and zero-point displacement control.

Although the voltage drive method has better stability and static characteristics, its load capacity is significantly reduced under high-speed motion conditions, and its closed-loop frequency response bandwidth is low (below 1Kz)

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