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Development of a hand-held multicell inverter-based ultrasonic plastic welder
Author(s)
Davies, Edward
Date Issued
2009
Type
Thesis
Publisher
Cape Peninsula University of Technology
Abstract
This thesis presents the design and development of a multicell inverter for ultrasonic plastic
welding applications and other ultrasonic applications. An overview of the main multilevel
topologies is given, but this research focuses on the multicelll inverter, because of its
capacitor voltage balancing properties.
Loading effects of various plastic materials to an ultrasonic plastic welding tool are provided
in this thesis. A simple method to create an approximate electrical equivalent circuit of the
ultrasonic welding tool, using an impedance analyser, loaded with different plastics is
discussed and illustrated.
Experimental results of the four-level multicell inverter driving a resistive load and an
ultrasonic transducer tool are presented in this thesis. These results provide proof that the
multicell inverter topology is capable of driving a non-linear load.
The inverter was tested with the ultrasonic load as an ultrasonic plastic welder and an
ultrasonic drill. The welding joints on the plastic samples are also evaluated in order to
evaluate whether or not this solution is suitable for plastic welding. The ultrasonic drilling
results are also shown in this thesis.
It is further illustrated that the ultrasonic tool and power supply combination may be used in
other ultrasonic applications.
welding applications and other ultrasonic applications. An overview of the main multilevel
topologies is given, but this research focuses on the multicelll inverter, because of its
capacitor voltage balancing properties.
Loading effects of various plastic materials to an ultrasonic plastic welding tool are provided
in this thesis. A simple method to create an approximate electrical equivalent circuit of the
ultrasonic welding tool, using an impedance analyser, loaded with different plastics is
discussed and illustrated.
Experimental results of the four-level multicell inverter driving a resistive load and an
ultrasonic transducer tool are presented in this thesis. These results provide proof that the
multicell inverter topology is capable of driving a non-linear load.
The inverter was tested with the ultrasonic load as an ultrasonic plastic welder and an
ultrasonic drill. The welding joints on the plastic samples are also evaluated in order to
evaluate whether or not this solution is suitable for plastic welding. The ultrasonic drilling
results are also shown in this thesis.
It is further illustrated that the ultrasonic tool and power supply combination may be used in
other ultrasonic applications.
Additional information
Thesis (MTech (Electrical Engineering))--Cape Peninsula University of Technology, 2009
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Development of a hand-held multicell inverter-based ultrasonic plastic welder.pdf
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