Power Supply of Macro-Micro Driven Linear Piezoelectric Motor

To investigate a novel macro and micro driven linear piezoelectric motor composed of an ultrasonic motor with macro movement and a piezoelectric actuator with micro movement, a digital signal processing (DSP) based macro and micro power supply is designed, which fits the new linear piezoelectric motor. The power supply comprises a control circuit, a voltage conversion circuit, an amplifier circuit, a half-bridge module, an optical isolators-drive circuit, etc, where the DSP of TMS320F28335 is used as the controller. When the linear piezoelectric motor working in a macro driven state, the power supply outputs alternating currents with high frequency and high voltage, which drives the linear piezoelectric motor dynamically at an ultrasonic frequency; while working in the micro driven state, the power supply outputs direct currents with high voltage, which drives the linear piezoelectric motor in micro driven statically. Here a prototype of the macro-micro power supply is designed. After a series of experiments on the power supply with and without loads, the results show that the power supply can drive and control the macro micro driven linear piezoelectric motor, and realizes quick and seamless switch between macro and micro drive. In addition, the power supply can drive and control the ultrasonic motor or piezoelectric ceramic micro actuator individually. The power supply achieves the multiple parameters of output signals adjustable simultaneously and exhibits good control characteristics.