scholarly journals Design and Performance of a Phase Angle Control Method Based on Digital Phase-locked Loop

2017 ◽  
Author(s):  
Bin Yi ◽  
Zhao Wei ◽  
Min Luo ◽  
Jinling Meng ◽  
Kai Deng ◽  
...  
Keyword(s):  
Phase Angle ◽  
Control Method ◽  
Phase Locked Loop ◽  
Digital Phase ◽  
And Performance

scholarly journals The invention relates to an intermediate frequency power supply fast start and digital phase locked loop control technology

2021 ◽  
Vol 2137 (1) ◽  
pp. 012016
Author(s):  
Demin Li ◽  
Qingliang Qin
Keyword(s):  
Induction Heating ◽  
Power Supply ◽  
Tracking Control ◽  
Control Method ◽  
Intermediate Frequency ◽  
Phase Locked Loop ◽  
Working Process ◽  
Frequency Tracking ◽  
Digital Phase ◽  
Frequency Power

Abstract Intermediate frequency induction heating is widely used because of its low energy consumption and high thermal efficiency, but the speed of traditional intermediate frequency power supply is slow and its frequency tracking accuracy is limited. In order to maintain the resonant state of the load during the working process of the induction heating power supply and realize the automatic frequency tracking control during the working process. The frequency tracking of the 40kW intermediate frequency power supply is researched, and a method of combining the resonant frequency automatic identification algorithm and the digital phase locked loop frequency tracking control method is proposed. MATLAB simulation and experiment show that the system based on this control method can save the time of searching the load resonance frequency in the initial stage of the power supply, improve the frequency tracking speed, accelerate the dynamic response speed of the system, avoid the failure of frequency lock, and play the role of fast and stable startup.

scholarly journals A 4-DOF Upper Limb Exoskeleton for Physical Assistance: Design, Modeling, Control and Performance Evaluation

2021 ◽  
Vol 11 (13) ◽  
pp. 5865
Author(s):  
Muhammad Ahsan Gull ◽  
Mikkel Thoegersen ◽  
Stefan Hein Bengtson ◽  
Mostafa Mohammadi ◽  
Lotte N. S. Andreasen Struijk ◽  
...  
Keyword(s):  
Upper Limb ◽  
Tracking Control ◽  
Degrees Of Freedom ◽  
Control Method ◽  
Mechanical Design ◽  
Trajectory Tracking Control ◽  
Upper Limb Exoskeleton ◽  
And Performance ◽  
Physically Disabled People ◽  
Human Upper Limb

Wheelchair mounted upper limb exoskeletons offer an alternative way to support disabled individuals in their activities of daily living (ADL). Key challenges in exoskeleton technology include innovative mechanical design and implementation of a control method that can assure a safe and comfortable interaction between the human upper limb and exoskeleton. In this article, we present a mechanical design of a four degrees of freedom (DOF) wheelchair mounted upper limb exoskeleton. The design takes advantage of non-backdrivable mechanism that can hold the output position without energy consumption and provide assistance to the completely paralyzed users. Moreover, a PD-based trajectory tracking control is implemented to enhance the performance of human exoskeleton system for two different tasks. Preliminary results are provided to show the effectiveness and reliability of using the proposed design for physically disabled people.

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