Class D amplifier for a power piezoelectric load
- 1 July 2000
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
- Vol. 47 (4), 1036-1041
- https://doi.org/10.1109/58.852087
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%.Keywords
This publication has 4 references indexed in Scilit:
- Ultrasonic waste-water treatment: incidence of ultrasonic frequency on the rate of phenol and carbon tetrachloride degradationUltrasonics Sonochemistry, 1997
- Operation of high-frequency resonant converters on the utility line with improved characteristicsIEEE Transactions on Power Electronics, 1997
- Basic considerations and topologies of switched-mode assisted linear power amplifiersIEEE Transactions on Industrial Electronics, 1997
- Class D voltage-switching MOSFET power amplifierIEE Proceedings B Electric Power Applications, 1991