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Automatic tuning system for ultrasonic generators

  • US 4,808,948 A
  • Filed: 09/28/1987
  • Issued: 02/28/1989
  • Est. Priority Date: 09/28/1987
  • Status: Expired due to Term
First Claim
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1. Apparatus for automatically tuning an ultrasonic power supply generator to the resonant frequency of a transducer comprising:

  • a voltage controlled oscillator (VCO),a power amplifier coupled to the output of said VCO,a transducer coupled to the output of said power amplifier,a phase detector coupled to the output of the power amplifier and to a current sensor in series with said transducer power supply,a processor coupled to the output of said phase detector for generating offset voltages,a summing circuit coupled to the output of said processor and to the output of said phase detector,said processor being programmed to supply different offset voltages to sweep said VCO through a range of predetermined frequencies which cover the resonant frequency of said transducer and to determine the resonant frequency of said transducer and the offset voltage required to maintain said VCO at the resonant frequency of said transducer.

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