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Grounding piezoelectric ceramic charge driver with composite low-frequency channel

A piezoelectric ceramic and driver technology, applied in electrical components, impedance networks, etc., can solve the problems of difficulty in generalization and poor low-frequency characteristics, and achieve the effects of expanding the effective frequency band, shortening the settling time, and expanding the control bandwidth.

Active Publication Date: 2017-03-08
HARBIN INST OF TECH
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  • Abstract
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  • Claims
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Problems solved by technology

[0003] The present invention proposes a grounded piezoelectric ceramic charge driver with a composite low-frequency path in order to solve the problems of poor low-frequency characteristics and difficulty in generalization of the existing charge controllers

Method used

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  • Grounding piezoelectric ceramic charge driver with composite low-frequency channel
  • Grounding piezoelectric ceramic charge driver with composite low-frequency channel

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Embodiment Construction

[0014] Combine figure 2 To describe this embodiment, this embodiment adopts a grounded structure, that is, the piezoelectric ceramic is connected between the output terminal of the high voltage operational amplifier and the ground. figure 2 Medium, C 1 And C p Form a high-frequency AC path, gain K and adjustable resistance R form a low-frequency AC path, gain K 1 And adjustable gain K 2 Form a non-linear compensation loop.

[0015] The high-frequency AC path is the main working circuit of the charge driver to eliminate the hysteresis and nonlinearity of piezoelectric ceramics. The lower cut-off frequency of the high-frequency path is the corner frequency of the driver, which determines the effective working frequency band of the driver. Adjustable resistance R and piezoelectric ceramic C p Uniquely determined turning frequency Represents the resistance value of the adjustable resistor R, Represents piezoelectric ceramic C p On the one hand, changing the resistance value of ...

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Abstract

The invention discloses a grounding piezoelectric ceramic charge driver with a composite low-frequency channel, and relates to a charge driver. The charge driver aims at solving the problems of poor low-frequency characteristic and poor universality of the existing charge controller. Non-inverting input ends of an operational amplifier A3 and an operational amplifier A4 are connected and serve as an input end of the driver; an output end of the operational amplifier A4 is connected with an inverting input end of the operational amplifier A3 by an adjustable gain K2; an output end of the operational amplifier A3 is connected with a non-inverting input end of a high-voltage operational amplifier A1 and an input end of a fixed gain K; an output end of the high-voltage operational amplifier A1 is connected with one end of a sensing capacitor C1 and an inverting input end of an operational amplifier A2; an output end of the operational amplifier A2 is connected with an inverting input end of the high-voltage operational amplifier A1; the other end of the sensing capacitor C1 is connected with a non-inverting input end of the operational amplifier A2, connected with an inverting input end of the operational amplifier A4 by a fixed gain K1, and connected with an output end of the fixed gain K by an adjustable resistor R; and the other end of piezoelectric ceramic Cp is grounded. The charge driver is used for driving the piezoelectric ceramic.

Description

Technical field [0001] The invention relates to a piezoelectric ceramic charge driver, in particular to a piezoelectric ceramic charge drive circuit with a composite low-frequency path. Background technique [0002] Piezoelectric ceramics are common braking components in precision mechanical systems. It has a series of advantages such as small size, large rigidity, high output displacement resolution, fast response speed, etc., so it is widely used in many fields such as scanning probe microscope, micro operation, nano positioning, precision servo valve and so on. However, the inherent hysteresis and nonlinearity of piezoelectric materials greatly limits the realization of high motion accuracy. In order to solve this problem, feedback control and feedforward control are the main technical solutions currently adopted, but both have certain problems. The performance of the feedback control system depends to a large extent on the sensors used, and high-precision micro-displacement...

Claims

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Application Information

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IPC IPC(8): H03H9/17
CPCH03H9/176
Inventor 杨琛赵杰
Owner HARBIN INST OF TECH
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