Piezoelectricity type micro-pump and its driving circuit

Abstract

The invention relates to a drive circuit applying in a piezoelectric actuating component composed of a drive period generation unit and a switch circuit unit. The drive period generation unit also comprises a drive indexing signal and a programmed microcontroller, wherein the programmed microcontroller generates a programmed drive period signal corresponding to the drive indexing signal after receiving the drive indexing signal and responding to the drive indexing signal. The switch circuit unit generates an alternate drive voltage corresponding to the drive period signal after connecting to the drive period generation unit and the piezoelectric actuating component as well as receiving the drive period signal. The waveform of the half wave leading edge of the alternate drive voltage has a gravity curve shape, the waveform of the half wave trailing edge of the alternate drive voltage is close to a vertical shape and the alternate drive voltage is connected to the piezoelectric actuating component.

Description

technical field [0001] The present invention relates to a driving circuit, especially a driving circuit applied to a piezoelectric actuator assembly, and a piezoelectric (Piezoelectric) micro-pump with the driving circuit. Background technique [0002] Figure 1E It is a driving circuit of a traditional piezoelectric actuator, which is disclosed in Japanese Patent JP2004282988A. Figure 1E The driving circuit shown can only charge and discharge the electrode on one side of the piezoelectric actuator component (11), so the vibration amplitude of the piezoelectric actuator component (11) will only reach half of the level. Figure 1F It is another traditional piezoelectric actuator drive circuit disclosed in US Patent No. US20070046143A1. exist Figure 1E and Figure 1F Among them, the source of the driving signal is generated by the electrodes of the piezoelectric actuator components (11), (13), the purpose of which is to enable the piezoelectric material to vibrate at its ow...

AI Technical Summary

Problems solved by technology

Observed Figure 1C and Figure 1D It is known from the half-wave front that the circuit will charge the piezoelectric actuator quickly. Although fast charging can make the piezoelectric actuator reach the top of the amplitude quickly, it also increases the power consumption.

In addition, due to the fast charging of the piezoelectric actuator, the piezoelectric actuator will resonate naturally when the piezoelectric actuator reaches the peak of its amplitude and before the piezoelectric actuator moves in the opposite direction. frequency creates vibration until the piezo actuator is discharged and acts in the opposite direction, and this natural vibration also creates a large noise problem

[0007] Furthermore, observe Figure 1D It is known that the waveform of its alternating driving voltage has the characteristics of fast charging and slow discharging. In addition to more power consumption, Figure 1D The trailing edge of the half-wave gradually decreases with a slope, which means that the piezoelectric actuator cannot discharge quickly, which will delay the time required to enter the next charging and discharging stroke, thereby affecting the actuation response time of the piezoelectric actuator

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