A harmonic signal phase adjustment method and device for piezoelectric microfluidic system

Abstract

The invention discloses a harmonic signal phase adjusting method and device for a piezoelectric micro-fluidic system. The device comprises: a main control chip, a sinxcosbetaphi construction circuit,a cosxsinphi construction circuit, a conditioning circuit, a key circuit, and a display circuit. During phase adjustment, harmonic signals are inputted in a manner of two columns of orthogonal signals; the main control chip sends digital control values k1 and k2 to a T type resistor network I and a T type resistor network II; after processing by the sinxcosbetaphi construction circuit, the cosxsinphi construction circuit, and the conditioning circuit, a sin (x+phi) analog value to realize harmonic signal phase adjustment. The digital control values are stored into the main control chip in a manner of format. According to the invention, the phase adjustment range is 0 to 360 degree; and with setting of an ntab value, the phase resolution can reach any precision level.

Description

technical field [0001] The invention relates to the technical field of harmonic signal phase adjustment, and relates to a harmonic signal phase adjustment method and device for piezoelectric microfluidic systems. The adjustment range of harmonic phase adjustment is 0°-360°, and the resolution can be any precision. Background technique [0002] Complex piezoelectric microfluidic control systems (such as dual active valve piezoelectric micropumps and dual-cavity series piezoelectric micropumps) are often driven by multiple harmonic signals, and the phase difference between harmonic signals can be precisely adjusted to accurately control the output pressure of the micropumps. , flow and other parameters. Compared with the voltage control and frequency control methods, it is beneficial to the life of the piezoelectric micropump, the control process is stable, and it can also realize the function expansion of the micropump: for example, for dual active piezoelectric micropumps, ...

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Problems solved by technology

[0003] In the past, RC circuits were often used for harmonic signal phase adjustment. The RC circuit is simple in form, but the phase adjustment range is narrow, and the adjustment process is easy to cause changes in signal frequency, amplitude and other parameters; another method is to use "direct digital frequency Synthesis (DDS)" technology, but for a specific type of DDS chip, its phase resolution is fixed and cannot be increased arbitrarily according to needs

Another method is to store the waveform data in the storage unit first, and modify the content or address of the storage unit by the microcontroller according to the phase adjustment requirements, thereby changing the output phase. Because of the need for continuous sampling and reconstruction, this method is very difficult for the microcontroller. The processing speed of the controller is very high, so it is not suitable for occasions with high working frequency

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