A Fuzzy-Pulse Width Modulation (PWM) Control Algorithm for a Computer Numerical Control (CNC) Laser Machine

2017 ◽  
Vol 23 (5) ◽  
pp. 4419-4423
Author(s):  
Cameron B Yao ◽  
Jayson P Rogelio ◽  
Renann G Baldovino ◽  
Felicito S Caluyo
Keyword(s):  
Pulse Width ◽  
Control Algorithm ◽  
Pulse Width Modulation ◽  
Computer Numerical Control ◽  
Numerical Control ◽  
Pwm Control ◽  
Laser Machine

Material Removal Rate Control in Open-Air Type Plasma Chemical Vaporization Machining by Pulse Width Modulation of Applied Power

2014 ◽  
Vol 625 ◽  
pp. 593-596
Author(s):  
Yoshiki Takeda ◽  
Yuki Hata ◽  
Katsuyoshi Endo ◽  
Kazuya Yamamura
Keyword(s):  
Material Removal Rate ◽  
Pulse Width ◽  
Material Removal ◽  
Pulse Width Modulation ◽  
Removal Rate ◽  
Scanning Speed ◽  
Control Mode ◽  
Pwm Control ◽  
Rf Power ◽  
Plasma Chemical

Plasma chemical vaporization machining (PCVM) is an ultraprecise figuring technique for optical components without introducing the subsurface damage. In our previous study, the material removal volume was controlled by changing the scanning speed of the worktable. However, because of inertia of the worktable, a discrepancy between the theoretical scanning speed and the actual scanning speed will occur if the spatial change rate of speed is rapid. Therefore, we proposed the application of the pulse width modulation (PWM) control and the amplitude modulation (AM) control of the applied RF power to control the material removal rate (MRR). Experimental results showed that the relationship between the MRR and the average RF power had high linearity, the control range of the PWM control mode was from 0.19 x 10-2 mm3/min to 3.90 x 10-2 mm3/min (from 5% to 100%), which was much wider than that of the AM control mode.

PWM Chopper of Ultrasonic Power Supply Based on FPGA

2012 ◽  
Vol 476-478 ◽  
pp. 1305-1308
Author(s):  
Chun Feng Sun ◽  
Wei Guang Zhang
Keyword(s):  
Power Supply ◽  
Pulse Width ◽  
Pulse Width Modulation ◽  
Output Pulse ◽  
Open Loop ◽  
Control Circuit ◽  
Ultrasonic Power ◽  
Pwm Control ◽  
Power Regulation ◽  
Regulation Method

Pulse width modulation (PWM) is often one of the important power regulation method of ultrasonic power supply. The traditional PWM control circuit has the shortcomings of complex design structure, slow dynamic response and low reliability. An advanced PWM technique for choppers of ultrasonic power supply based on FPGA is proposed. Through open-loop operation, it regulates the output pulse width of ultrasonic power supply dynamically. The simulation result shows that the PWM control circuit based on FPGA can realize to adjust the width of PWM signal and power regulation conveniently.

Research on Limit-Trajectory Over-Modulation Strategy of Two Stage Matrix Converter

2014 ◽  
Vol 599-601 ◽  
pp. 1648-1651
Author(s):  
Jing Lu ◽  
Ming Shen
Keyword(s):  
Pulse Width ◽  
Control Algorithm ◽  
Pulse Width Modulation ◽  
Poor Quality ◽  
Matrix Converter ◽  
Two Stage ◽  
Memory Space ◽  
Look Up Table ◽  
Linear Modulation

Aim at solving the problem is poor quality of waveforms and that of complicated modulation strategy in two stage matrix converter. The method is that Limit-Trajectory over-modulation strategy is adopted in inverter to ensure linear modulation in all over-modulation regions and space vector pulse width modulation is adopted in rectifier. This simpler control algorithm reduces memory space and linear calculation is instead of look-up table. Simulation show that the voltage transfer ratio can be improved from 0.866 to 0.95 and the quality of output waveforms is greatly enhanced.

scholarly journals Single Phase Asymmetrical Cascaded MLI with Extreme Output Voltage Levels to Switch Ratio

2018 ◽  
Vol 9 (2) ◽  
pp. 712
Author(s):  
Mahrous Ahmed ◽  
Essam Hendawi ◽  
Mohamed K. Metwaly
Keyword(s):  
Fundamental Frequency ◽  
Pulse Width ◽  
Output Voltage ◽  
Single Phase ◽  
Pulse Width Modulation ◽  
Modulation Index ◽  
Pwm Control ◽  
Inductive Load ◽  
Control Schemes ◽  
Simulation Results

This paper proposes an asymmetrical cascaded single phase H-bridge inverter. The proposed inverter consists of two modules with unequal and isolated dc sources. Each module is composed of dc source, conventional four switches H-bridge and single bidirectional switch. To increase the output voltage levels, the tertiary ratio, 1:3, between its two dc sources is adopted. Both the fundamental frequency and the multicarrier pulse width modulation (PWM) control schemes are employed to generate switches signals. By controlling the inverter modulation index, the proposed inverter can generate an output voltage having up to seventeen levels by using only two modules. The proposed topology has also the feature of modularity which means that it can be extended to any levels by adding new modules. The proposed topology is simulated using an inductive load and some selected simulation results have been provided to validate the proposed inverter.

scholarly journals Experimental Verification of Three phase quasi Switched Boost Inverter with an Improved PWM Control

2019 ◽  
Vol 10 (3) ◽  
pp. 1500
Author(s):  
Sriramalakshmi Palanidoss ◽  
Sreedevi V.T.
Keyword(s):  
Experimental Investigation ◽  
Theoretical Analysis ◽  
Pulse Width ◽  
Pulse Width Modulation ◽  
Control Technique ◽  
Duty Ratio ◽  
Pwm Control ◽  
Three Phase ◽  
Set Up ◽  
And Inversion

<p>In this paper, an experimental investigation of a three phase quasi Switched Boost Inverter (qSBI) topology is proposed and analysed with an improved Pulse Width Modulation strategy. The qSBI is capable of providing both boost and inversion actions in a single stage. The improved PWM control technique can provide a higher boost with the reduced duty ratio. The theoretical analysis presented in this work is validated using an experimental set up of 100W qSBI topology and hardware results are shown for verification. The improved PWM strategy is implemented and firing pulses are generated in FPGA SPARTAN 3E kit. With the duty ratio of 0.05, the peak ac load voltage of 80 V is obtained. The performance of three phase qSBI is analysed with both conventional PWM strategy and improved PWM strategy. The observations are presentated in detail.</p>

A Fuzzy-Based Pulse-Width Modulation (PWM) Control for Low Speed Autonomous Emergency Braking (AEB) System: A Mini-Fuzzy Associative Matrix (FAM) Approach

2017 ◽  
Vol 23 (11) ◽  
pp. 11404-11408
Author(s):  
Renann G Baldovino ◽  
Aira Patrice R Ong ◽  
Paul Dominick E Baniqued ◽  
Elmer P Dadios
Keyword(s):  
Pulse Width ◽  
Pulse Width Modulation ◽  
Pwm Control ◽  
Low Speed ◽  
Emergency Braking ◽  
System A
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