Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Frequency sweep and frequency following control method for frequency of ultrasonic welding power source

A technology of ultrasonic welding and power frequency, applied in the direction of output power conversion devices, electrical components, high-efficiency power electronics conversion, etc., can solve the problems of reducing work efficiency and exacerbating the loss of transducers, and achieves simple circuits, high speed and low cost. easy effect

Pending Publication Date: 2018-08-31
深圳市大七易科技有限公司
View PDF3 Cites 14 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the welding process, due to the welding load and the temperature of the ultrasonic acoustic system, energy loss, welding area, welding head processing wear, etc., the equivalent capacitance and resistance of the ultrasonic generator load will change with the work, which will cause the ultrasonic acoustic system. The natural frequency drifts. If the power frequency of the ultrasonic generator does not follow the change, it will cause the ultrasonic system to no longer work at the resonance point, reduce work efficiency, and increase the loss of the transducer. Therefore, the ultrasonic generator must have a frequency tracking function. Ensure that the frequency of the inverter trigger pulse in the ultrasonic generator follows the resonant frequency of the load

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 more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Frequency sweep and frequency following control method for frequency of ultrasonic welding power source
  • Frequency sweep and frequency following control method for frequency of ultrasonic welding power source

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A frequency sweeping frequency tracking control method for an ultrasonic welding power supply frequency, comprising the following steps:

[0019] Step 1: After turning on the ultrasonic generator, the MCU controller controls the inverter to output a certain initial operating frequency through the drive controller;

[0020] Step 2: Detect the working current in the ultrasonic system; the frequency sweeping mode is that the MCU controller controls the inverter output frequency to be f 0 +Δf;

[0021] Step 3: Detect the working current in the ultrasonic system, if the working current in the ultrasonic system increases, it means f 0 is not the resonance frequency of the ultrasonic system, continue to increase the output frequency f of the inverter according to a certain step size 0 +Δf; if the operating current in the ultrasonic system decreases when the output frequency of the transducer is increased, the output frequency of the control inverter becomes f 0 -Δf, if the ...

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

No PUM Login to View More

Abstract

The invention discloses a frequency sweep and frequency following control method for frequency of an ultrasonic welding power source, comprising the following steps: Step 1, after an ultrasonic generator is turned on, an MCU controller controls an inverter to output certain initial working frequency through a driving controller; Step 2, the working current in an ultrasonic system is detected, andthe frequency sweeping operation mode is that the MCU controller controls the output frequency of the inverter to be f0+[delta]f; and Step 3, the working current in the ultrasonic system is detected.The method can realize the ultrasonic generator frequency tracking function, so that the ultrasonic generator can follow change in the equivalent capacitance and resistance of the ultrasonic generatorload with the operation, the inherent frequency of the ultrasonic acoustic system is caused to drift, the entire ultrasonic system is enabled to work in a resonant state, and the maximum power is output. The frequency sweep and frequency following control method is fast in real-time reflection speed, the circuit is simple, and the cost is relatively low.

Description

technical field [0001] The invention relates to the technical field of ultrasonic welding, in particular to a frequency sweeping control method for ultrasonic welding power supply frequency. Background technique [0002] The acoustic system of the existing ultrasonic welding machine is mainly composed of an ultrasonic generator, an ultrasonic transducer, an ultrasonic horn, and a welding head. During the welding process, due to the welding load and the temperature of the ultrasonic acoustic system, energy loss, welding area, welding head processing wear, etc., the equivalent capacitance and resistance of the ultrasonic generator load will change with the work, which will cause the ultrasonic acoustic system. The natural frequency drifts. If the power frequency of the ultrasonic generator does not follow the change, it will cause the ultrasonic system to no longer work at the resonance point, reduce work efficiency, and increase the loss of the transducer. Therefore, the ultr...

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
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): H02M5/458
CPCH02M5/458Y02B70/10
Inventor 蒋传庆
Owner 深圳市大七易科技有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products