Title:
MULTI-BAND RESONANT FREQUENCY TRACKING CIRCUIT AND METHOD APPLIED TO ULTRASONIC MACHINING
Document Type and Number:
WIPO Patent Application WO/2023/060638
Kind Code:
A1
Abstract:
A multi-band resonant frequency tracking circuit applied to ultrasonic machining, comprising an output current and voltage phase difference direction detection circuit and a multi-band resonant frequency tracking circuit. A detection signal output end of the output current and voltage phase difference direction detection circuit is connected to a signal input end of the multi-band resonant frequency tracking circuit. By adopting the technical solution, a system detuning situation is quickly determined by means of a current and voltage phase difference direction detection signal outputted by a D flip-flop in an SN74HC74D chip, and dead zone resistance between a pin 5 and a pin 7 in an EG3525 chip can be changed in time according to the detuning degree of a piezoelectric transducer, such that the system driving frequency is changed to track the resonant frequency of the piezoelectric transducer, and rapid and accurate tracking is realized. The realization process of the function of the circuit is simple and rapid, and the capability of rapidly and accurately tracking a forward resonant frequency point of the piezoelectric transducer is improved.
Inventors:
KONG YAGUANG (CN)
CHEN ZHANGPING (CN)
TANG XICHAO (CN)
ZOU HONGBO (CN)
HUANG NA (CN)
ZHANG FAN (CN)
ZHAO XIAODONG (CN)
CHEN HONGHUAN (CN)
CHEN ZHANGPING (CN)
TANG XICHAO (CN)
ZOU HONGBO (CN)
HUANG NA (CN)
ZHANG FAN (CN)
ZHAO XIAODONG (CN)
CHEN HONGHUAN (CN)
Application Number:
PCT/CN2021/125273
Publication Date:
April 20, 2023
Filing Date:
October 21, 2021
Export Citation:
Assignee:
UNIV HANGZHOU DIANZI (CN)
International Classes:
G01R23/06
Foreign References:
| CN110149056A | 2019-08-20 | |||
| CN113252977A | 2021-08-13 | |||
| CN113134155A | 2021-07-20 | |||
| CN110702971A | 2020-01-17 | |||
| US20110159829A1 | 2011-06-30 |
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