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Method of driving a capacitive load and drive circuit therefor

A capacitive load, driving circuit technology, applied in circuits, piezoelectric or electrostrictive device parts, piezoelectric/electrostrictive/magnetostrictive devices, etc., can solve the problem of limited actuator control, Does not provide accurate control of the voltage waveform rising and falling slew rates of piezoelectric actuators, etc.

Active Publication Date: 2014-05-07
GLOBAL INKJET SYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, such a circuit does not provide accurate control of the rising and falling slew rate of the voltage waveform applied to the piezoelectric actuator, and thus the control of the actuator will be limited

Method used

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  • Method of driving a capacitive load and drive circuit therefor
  • Method of driving a capacitive load and drive circuit therefor
  • Method of driving a capacitive load and drive circuit therefor

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Embodiment Construction

[0034] figure 1 A schematic diagram of the drive circuit is shown. in particular, figure 1 A drive circuit 1 capable of driving a variable capacitive load 2 with a predetermined target waveform of 150V is described. The target waveform is referenced below Figure 2a , 2band 2c are described in detail. Although the target waveforms for this embodiment are relatively high voltages, any suitable voltage range may be used.

[0035] The capacitive load 2 may be a piezoelectric actuator or other such capacitive load. The capacitance of the capacitive load 2 used in this embodiment is in the range up to 2OnF, but is not limited to this range depending on the application used for the drive circuit.

[0036] The drive circuit 1 comprises an input 3 connected to a power supply 4, an output 5 connected to a capacitive load 2, an inductor 6 connected between the input 3 and the output 5, and an inductor 6 connected in parallel between the output 5 and the input 3 The transformer 7....

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PUM

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Abstract

A method for driving a capacitive load using a target voltage waveform having a peak voltage and an average rise and fall slew rate, wherein the average rise and fall slew rates comprise at least one voltage step, the method comprising supplying power from an input to an output for charging a capacitive load to obtain a peak voltage and average rise slew rate in response to the target waveform, discharging the capacitive load to obtain an average fall slew rate in response to the target waveform, and returning the discharged power from the capacitive load to the input.

Description

technical field [0001] The present invention relates to methods and drive circuits for driving capacitive loads, such as piezoelectric actuators for printhead arrays. Background technique [0002] The piezoelectric material acts as a capacitive load, and the capacitance is proportional to the number of piezoelectric actuators actuated in the array at any one time. A printhead array may include such piezoelectric actuators. Piezoelectric materials offer various significant advantages over alternative mechanical actuators, including small size, low power consumption, and high-speed response. [0003] Various drive circuits for driving such piezoelectric actuators are disclosed in the art. For example, US Patent No. 4,749,897 discloses a drive circuit for controlling the mechanical displacement of a piezoelectric element to a desired target value whereby the amount of energy stored in a transformer is controlled to control the mechanical displacement of the piezoelectric elem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L41/04H10N30/80
CPCB41J2/04548B41J2/04581Y02P70/10H10N30/802B41J2/04588H03K17/687B41J2/07H02P31/00
Inventor M·潘伯斯
Owner GLOBAL INKJET SYST