title: Class D amplifier for a power piezoelectric load.
abstract: We present a high efficiency inverter (>90%) that can drive an acoustic cavitation reactor with a 2 kW power between 10 and 100 kHz. This reactor is composed of numerous piezoelectric transducers and is particularly used to accelerate various industrial chemical reactions and destroy a variety of organic contaminants in water. The class-D amplifier or inverter is composed of power MOSFETs, type IRFP460, in a full bridge configuration driven by IR2110 circuits in bootstrap mode. The specific nature of the problem comes from the fact that, at frequencies slightly different from a resonant frequency frn, the load is mostly capacitive. The insertion of an appropriate low-pass filter in front of the load allowed an efficient solution to the problem due to the load being capacitive for harmonics. The realized system can provide nearly 2 kW to this type of piezoelectric load, with an efficiency of more than 95%
authors.affiliation: Dept. de Genie Electr. et Genie Inf., Quebec Univ., Trois-Rivieres, Que.
authors.forename: K
authors.initials: K
authors.lastname: Agbossou
authors.forename: J L
authors.initials: JL
authors.lastname: Dion
authors.forename: S
authors.initials: S
authors.lastname: Carignan
authors.forename: M
authors.initials: M
authors.lastname: Abdelkrim
authors.forename: A
authors.initials: A
authors.lastname: Cheriti