Title :
Design of a self-oscillating class D power amplifier for piezoelectric actuators
Author :
Xinchang Liu ; Germano, Paolo ; Civet, Yoan ; Perriard, Yves
Author_Institution :
Integrated Actuators Lab. (LAI), Ecole Polytech. Fed. de Lausanne (EPFL), Lausanne, Switzerland
Abstract :
A design of a delay based self-oscillating class-D power amplifier for piezoelectric actuators is presented and modelled. First order and second order configurations are discussed in detail and analytical results reveal the stability criteria of a second order system, which should be respected in the design. It also shows if the second order system converges, it will tend to give a correct pulse modulation regarding to the input modulation index. Experimental results show the effectiveness of this design procedure. For a piezoelectric load of 400 nF, powered by a 150 V 10 kHz sinusoidal signal, a total harmonic distortion (THD) of 4.3% is obtained.
Keywords :
piezoelectric actuators; power amplifiers; pulse modulation; THD; capacitance 400 nF; first order configuration; frequency 10 kHz; input modulation index; piezoelectric actuator; pulse modulation; second order configuration; second order system; self-oscillating class D power amplifier design; sinusoidal signal; stability criteria; total harmonic distortion; voltage 150 V;
Conference_Titel :
Electrical Machines and Systems (ICEMS), 2014 17th International Conference on
Conference_Location :
Hangzhou
DOI :
10.1109/ICEMS.2014.7014077
