| Summary: | 碩士 === 中原大學 === 機械工程研究所 === 98 === The objective of this research is to design a driving circuitry of power amplifier for application to piezoelectric actuators. The circuit design consists of the Voltage Control Amplifier (VCA) circuit, the class-D amplifier circuit, and the direction selection circuit. The VCA circuit consists of the full-wave rectifier, the square wave generator, and the integrator. The range of control signal of VCA is greater than that of the previous designed audio amplification Integrated Circuit (IC). The power amplifier is designed base upon a class-D amplifier. The pulse width modulation (PWM) of the class-D amplifier is generated by a single chip. LC filter is used and implemented in the Back amplifier so that matching impedance between the piezoelectric capacitance and the circuit becomes easier and more efficient. MOSFET is used for the direction selection circuit to replace TRIAC for the purpose of simplifying the circuit design. Finally, via the experimental test, the design of the driving circuitry is verified to be able to improve accuracy as well as reduce circuit complexity and energy consumption.
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