Automatic frequency tracking system for needle actuating device

2014 ◽  
Author(s):  
Lin Gui ◽  
Rui Xiao ◽  
Xiaochun Liao ◽  
Yang Kuang ◽  
Muhammad Sadiq ◽  
...  
Keyword(s):  
Tracking System ◽  
Automatic Frequency ◽  
Frequency Tracking

Study of Induction Heating Power Supply Based on 74HC4046

2014 ◽  
Vol 1008-1009 ◽  
pp. 663-667 ◽  
Author(s):  
Yan Cui ◽  
Xiao Jun He ◽  
Ze Ping Lin ◽  
Qing Bin Chen ◽  
Wei Hao Yang ◽  
...  
Keyword(s):  
Resonance Frequency ◽  
Induction Heating ◽  
Power Supply ◽  
Simulation Experiment ◽  
Tracking System ◽  
Output Frequency ◽  
Phase Compensation ◽  
Frequency Tracking ◽  
Iron Load ◽  
Inverter Power Supply

According to the change of resistivity and magnetic permeability of iron load which will influence the resonance frequency in the process of induction heating, this paper presents a frequency tracking system based on the 74HC4046. It can control the output frequency of the power supply in real time, and make the power output frequency to trace the resonance frequency of load. This paper also analyses the phase compensation of the control system, and proposes a new way of phase compensation. The corresponding simulation experiment is done finally. It provides the theory basis to analyze and design an inverter power supply.

Automatic Frequency-Tracking Control for Ultrasound Welding System

2011 ◽  
Vol 204-210 ◽  
pp. 2041-2044
Author(s):  
Kao Feng Yarn ◽  
King Kung Wu ◽  
Kai Hsing Ma ◽  
Wen Chung Chang
Keyword(s):  
High Power ◽  
Tracking Control ◽  
Control Method ◽  
Ultrasonic Welding ◽  
Automatic Frequency ◽  
Frequency Tracking ◽  
Power Ultrasonic ◽  
Fpga Chip ◽  
Working Frequency ◽  
Welding System

A new frequency-tracking control method to catch the optimal working frequency for the high power ultrasonic welding system is proposed. In a high power ultrasonic resonant system, the induced high temperature will change the working frequency. Therefore, the proposed control method to track the optimal working frequency becomes very attractive and important. This control method is practically implemented by a FPGA chip which basically includes two logic circuits. One logic circuit is to find the optimal working frequency automatically and the other one is to adjust the working frequency by detecting the working current simultaneously. Experimental results exhibit the new method can effectively control and track frequency for high power ultrasonic welding system.

Analysis of a Natural Frequency Tracking System for MEMS Fatigue Testing

2001 ◽  
Author(s):  
Xiaotian Sun ◽  
Roberto Horowitz ◽  
Kyriakos Komvopoulos
Keyword(s):  
Control System ◽  
Natural Frequency ◽  
Averaging Method ◽  
Fatigue Testing ◽  
Tracking System ◽  
Frequency Tracking ◽  
At Resonance ◽  
Mems Resonator ◽  
Control Gain ◽  
Good Agreement

Abstract A nonlinear control system that can track the natural frequency of a MEMS resonator was developed in this study. Due to the evolution of fatigue damage, the natural frequency of the resonator decreases. To maintain the device at resonance, a phase-locked loop system is used to track the frequency decay and adjust the driving force accordingly. A model for the control system is introduced and the system behavior is analyzed using an averaging method. A quantitative criterion for selecting the control gain to achieve stability is derived from the analysis. Simulation results are shown to be in good agreement with the prediction of the theoretical analysis.

IMPROVED PERFORMANCE PHASE DETECTOR FOR MULTIPLICATIVE SECOND-ORDER PLL SYSTEMS USING DEFORMED ALGEBRA

2014 ◽  
Vol 23 (01) ◽  
pp. 1450008
Author(s):  
MARCONI O. DE ALMEIDA ◽  
EDUARDO T. F. SANTOS ◽  
JOSÉ M. ARAÚJO
Keyword(s):  
Control Systems ◽  
Tracking System ◽  
Phase Detector ◽  
Phase Locked Loops ◽  
Frequency Tracking ◽  
Maximum Likelihood Approach ◽  
Multiplicative Type ◽  
Likelihood Approach ◽  
Improved Performance ◽  
And Control

Phase-locked loops (PLL) is a phase and/or frequency tracking system, widely used in communication and control systems. The sinusoidal multiplicative type PLL still remains a recurrent model, due the fact that its derivation is originated from the maximum likelihood approach. In this note, it is showed as a generalized product, called q-product, which can be used to implement the phase detector and improve some important parameters of the PLL system, as the block linearity and pull-in characteristics. Numerical examples are presented in order to illustrate the proposal.

Stability Design of Resonance Frequency Tracking System for Sensing Resonator

2020 ◽  
Vol 20 (5) ◽  
pp. 2570-2577
Author(s):  
Jun Xu ◽  
Hui Li ◽  
Xiao Wang ◽  
Danni Liu ◽  
Lishuang Feng
Keyword(s):  
Resonance Frequency ◽  
Tracking System ◽  
Frequency Tracking

Frequency Tracking Of A Prototype Elliptical RF Cavity

2020 ◽  
Author(s):  
RAJDIP DAS
Keyword(s):  
Radio Frequency ◽  
Tracking System ◽  
Microwave Cavity ◽  
Frequency Tracking ◽  
Rf Cavity ◽  
Phase Detectors

Abstract Remarkable development with the use of microwave cavity has occurred during the last two to three decades, particularly in portable correspondence, TV transmission, modern/local applications, satellite correspondence, telemetry, RADAR/navigational guides, and so forth. This quick improvement inside the microwave which of computerized advances has synergized, bringing about further quickened rate. The paper reports primarily on the frequency tracking system probably be coupled with radio frequency (RF) cavity. For the creating and testing of the tracking system, we have used phase detectors and loop filters throughout. The quality of the tracking system and thus the underlying scanning results were seen to help the realistic tests.

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