Frequency tracking method of ultrasonic machining system
A processing system and frequency tracking technology, applied in the ultrasonic field, can solve the problem of low control accuracy
Pending Publication Date: 2020-10-23
杭州国彪超声设备有限公司
View PDF0 Cites 6 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
The matching inductance adjustment method is to adjust the phase difference of the output voltage and current of the power supply by adjusting the size of the matching inductance of the transducer loop under the condition that the output frequency of the power supply remains unchanged, so as to achieve the purpose of resonance of the transducer loop. It is relatively low, and it is realized by manual control in many occasions. It is not recommended to use it in occasions with high precision requirements. It is generally used as an auxiliary control for other frequency tracking methods.
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0026] as attached figure 1 It can be seen from the equivalent parameter circuit of the transducer that the ultrasonic transducer has positive and negative resonant frequencies. When the output voltage frequency of the ultrasonic power supply is outside the positive and negative resonant frequencies, the equivalent parameter circuit of the transducer presents an inductive load characteristic; The equivalent parameter circuit of the transducer exhibits capacitive load characteristics within the forward and reverse resonance frequencies.
[0027] In practical application, it is found that when the transducer works at the reverse resonance frequency point, the equivalent impedance modulus value of the transducer loop is the smallest, the current component is the largest, and the output amplitude of the transducer will reach the maximum value. Therefore, the frequency chasing algorithm needs to lock the working frequency near the reverse resonance frequency point in real time.
...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention relates to a frequency tracking method of an ultrasonic machining system. Voltage signals at the two ends of an ultrasonic transducer and current signals of an ultrasonic transducer loopare collected, and the two signals are input into the positive input ends of corresponding comparators respectively to be converted into square wave signals with the same phase; the two square wave signals are input into an exclusive-OR gate XOR and a D trigger, and the pulse width of an output pulse signal of the exclusive-OR gate XOR reflects the phase difference of the voltage signal and the current signal; and the level state of the output end of the D trigger reflects the impedance characteristic of the ultrasonic transducer. By detecting the resonance state of the current transducer inreal time and tracking the resonance frequency of the transducer in combination with an algorithm, the purpose of rapidly and accurately tracking the change of the resonance frequency of the transducer is achieved.
Description
technical field [0001] The invention relates to the field of ultrasonic waves, in particular to a frequency tracking method of an ultrasonic processing system. Background technique [0002] Ultrasonic power supply, also known as ultrasonic generator, is the energy provider for all ultrasonic applications. Due to the influence of the working environment (such as temperature, pressure, etc.), the resonant frequency of ultrasonic transducers will drift. state, the frequency of the output voltage of the ultrasonic power supply must always follow the resonant frequency of the ultrasonic transducer. [0003] The traditional ultrasonic power frequency tracking methods include the maximum current search resonant frequency method, the phase-locked loop frequency tracking method and the matching inductance adjustment method. Among them, the maximum current search resonance frequency method is to use the characteristics of the ultrasonic transducer with the smallest impedance and the ...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Applications(China)
IPC IPC(8): H03L7/08H03K3/037
CPCH03L7/08H03K3/037
Inventor 周丽娟
Owner 杭州国彪超声设备有限公司