Frequency Conversion Type Ultrasonic Power Based on DSP Control Technology Research

Abstract

The introduction of the direct digital frequency synthesis (DDS) technology in the field of communication is against the traditional ultrasonic machining power supply which does not have the multi-frequency tracking shortcomings to build a frequency conversion type ultrasonic power. Frequency conversion type ultrasonic power supply is based on DSP embedded system and adopts direct digital frequency synthesis (DDS) technology combined with a software phase locked frequency of composite frequency tracking scheme to realize automatic search transducer resonance frequency and frequency automatic tracking function which can response the different characteristics of the transducer dynamical; With the use of phase shift control power-principle to realize the output power regulating function when the frequency changes and reduce the switching power loss; It provides an important reference for the design of new frequency conversion type ultrasonic power.

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“…The DDS implemented in the FPGA is a core part of automatic resonance frequency tracking, since it has the advantages of high frequency resolution, short tuning latency, fast frequency switching speed, wide frequency adjustment range and is programmable [28][29][30]. The DDS output frequency can be expressed as f 0 = K 2 N f s , where K is the frequency control word, N is the word length of the phase accumulator, and f s is the sampling clock.…”