Frequency tracking circuit structure in ultrasonic power

A technology of frequency tracking and circuit structure, applied in the direction of electrical components, automatic control of power, etc., can solve the problems of difficult realization and adjustment of phase-shifting circuits, etc.
CN101145778AInactive Publication Date: 2008-03-19JIANGSU WELM TECH
0 Cites 17 Cited by

Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
JIANGSU WELM TECH
Publication Date
2008-03-19
Estimated Expiration
Not applicable · inactive patent

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
Patent Text Reader

Abstract

The invention relates to a frequency tracking circuit structure for an ultrasonic power supply, specifically, which is used for ultrasonic screening, ultrasonic plastic welding, ultrasonic metal welding, ultrasonic machining and other application domains. The frequency tracking circuit comprises a current transformer, a photocouping voltage sampling circuit, a first bandwidth limited circuit, a second bandwidth limited circuit, a first comparing and shaping circuit, a second comparing and shaping circuit, a first frequency dividing circuit with output terminal connected with the input terminal of a phase-detecting circuit, and a second frequency dividing circuit with output terminal connected with the input terminal of the phase-detecting circuit, wherein the output terminal of the phase-detecting circuit is sequentially connected with a low-pass filter circuit, a voltage current switching circuit, and a voltage-controlled oscillation frequency control circuit. The invention uses frequency dividing circuit, so that when operating at resonant frequency, the voltage and current in transducer circuit are at the same state, thereby achieving the purpose of automatic frequency tracking.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The invention relates to a frequency tracking circuit structure in an ultrasonic power supply, in particular to the application field of ultrasonic screening, ultrasonic plastic welding, ultrasonic metal welding, ultrasonic processing and other power ultrasonic applications. Background technique

[0002] In the prior art, the frequency tracking circuit used in ultrasonic screening, ultrasonic plastic welding, ultrasonic metal welding, ultrasonic processing and other ultrasonic power supplies mainly uses current transformers to connect bandpass filter circuits, comparison shaping circuits, and phase shifting circuits in sequence through wires. The circuit is connected to the phase-locked loop circuit; the voltage sampling circuit is sequentially connected to the filter circuit and the comparison shaping circuit through wires, and the comparison shaping circuit is connected to the phase-locked loop circuit. When the ultrasonic frequency of this kind of c...

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