Control scheme evaluation for class-D amplifiers in a power-ultrasonic system

Reference:

Wang, Y., Draper, M.J., Denley, S.M., Robinson, F.V.P. and Shepherd, P.R., 2012. Control scheme evaluation for class-D amplifiers in a power-ultrasonic system. In: 6th IET International Conference on Power Electronics, Machines and Drives (PEMD 2012). IET, A113. (IET Conference Publications; 2012/CP592)

Related documents:

Official URL:

http://dx.doi.org/10.1049/cp.2012.0237

Abstract

Power-converters or amplifiers are required to drive highpower piezoelectric transducers and attached processing equipment, at the optimum resonance mode for best processing efficacy, while under varying loading conditions. The driving power converter must synthesize relatively low-distortion sinusoidal output current to prevent harmonic-current excitation of neighbouring, less-productive or desirable resonant modes. Continuously-variable output-voltage capability is required to maintain output power at a level which optimises processing. Three output synthesis methods have been reviewed in this paper for the Class-D amplifier constituting the transducer driver. Typical output-waveform quality is assessed, and PSPICE simulation and laboratory results are presented to illustrate performance.

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