METHOD AND SYSTEM FOR SEARCHING FOR RESONANT FREQUENCY OF TRANSDUCER

摘要

A system for searching for a resonant frequency of a transducer, comprising: an initializing unit (11), a phase determining unit (12), an interval hopping control unit (13), a hopping interval generating unit (15), a frequency output control unit (17), a phase acquiring unit (16), and a resonant frequency obtaining unit (14). The search range of the interval for the last search can be narrowed by at least half thereof in each frequency hopping, thus allowing for reduced amount of searches.

主权项

1. A method for searching for a resonant frequency of a transducer, comprising:
determining a current searching interval for searching for the resonant frequency of the transducer, and setting a preset driving frequency in the current searching interval; determining a hopping-up interval and a hopping-down interval according to the preset driving frequency and two endpoints of the current searching interval; obtaining a current phase and a voltage phase of the transducer operating at the preset driving frequency, and determining whether a preset condition is satisfied; and hopping to the hopping-up interval or the hopping-down interval according to a relationship between the current phase and the voltage phase and taking the hopping-up interval or the hopping-down interval as a new searching interval for the resonant frequency if preset condition is not satisfied, or obtaining a corresponding frequency of the transducer as the resonant frequency if the preset condition is satisfied.