Continues work ultrasonic power Supply for ultrasonic Non-woven sealing

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Ultrasonic welding is based on the introduction of a certain type of acoustic waves to the welded material. This process is also used in ultrasonic drilling, cutting and cleaning. Typical frequency range used is between 18 kHz and 70 kHz. Output power varies from hundreds W to a few kW. Standard welding system consists of an electrical power supply (generator), and ultrasonic stack consisting of a transducer, booster and sonotrode (horn). The generator is responsible for supplying correct electrical signal to the transducer as well as for process control. Transducer transforms electrical supply signal into mechanical longitudinal vibrations which are transferred to sonotrode and ultimately to the welded material

The main task of the generator is to transmit power to the transducer in such a way that the transducer is Universal Ultrasonic Generator for Welding most efficient at transforming electrical power into mechanical vibration power. Output waveform of ultrasonicgenerator is sinusoidal and output frequency of particular generator is variable in narrow range. Narrow frequencyband and sinusoidal output voltage allow the use of a resonant converter . Such a solution eliminates commutation losses in power switching transistor, hence has better efficiency compared to other converter designs. This ultrasonic generator can deliver to the load up to 1800 W of continuous power in 20 kHz version. Other frequency variants of the device such as 28 kHz and 40 kHzwere also under developed.

New method of controlling output power of the welding system enables the weld quality improvement in various ultrasonic technologies. The ability to exibly deline power levels and its changes during the welding process completes list of process parameters required to efficiently realize every ultrasonic welding technology. Presented ultrasonic generator is suitable for many ultrasonic technologies including ultrasonic welding andultrasonic drilling.