Ultrasonic Bath Modeling and Investigation

A novel costeffective and highefficiency simulation piezoelectric ceramic transducer (PCT )model for an ultrason-ic cleaner is proposed. The inverter circuit topology is a Class E resonant inverter for driving a sandwich PCT at its resonance frequency. With tactfully designed circuit parameters, the Class E resonant inverter is operated at the suoptimum mode to minimize switching losses of the active switch, leading to a high circuit efficiency. The active switch is controlled by pulsewidth modulation at a fixed switching frequency and constant duty ratio to adjust the output power of the PCT. The operation modes, PSPICE model of transducer and steps for the parameters extraction are proposed. A prototype circuit designed for a 42W ultrasonic cleaner was built and tested to verify the model. Satisfactory perfor-mances are obtained from the experimental results.