The Experts below are selected from a list of 7161 Experts worldwide ranked by ideXlab platform
Howard D Sanders - One of the best experts on this subject based on the ideXlab platform.
-
a 1 ma variable risetime pulse generator for high energy density plasma research
Review of Scientific Instruments, 2008Co-Authors: J B Greenly, J Douglas, D A Hammer, B R Kusse, S C Glidden, Howard D SandersAbstract:COBRA is a 0.5Ω pulse generator driving Loads of order 10nH inductance to >1MA current. The design is based on independently timed, laser-triggered switching of four water pulse-forming lines whose outputs are added in parallel to drive the Load current pulse. The detailed design and operation of the switching to give a wide variety of current pulse shapes and rise times from 95to230ns is described. The design and operation of a simple Inductive Load voltage monitor are described which allows good accounting of Load impedance and energy dissipation. A method of eliminating gas bubbles on the underside of nearly horizontal insulator surfaces in water was required for reliable operation of COBRA; a novel and effective solution to this problem is described.
-
a 1 ma variable risetime pulse generator for high energy density plasma research
Review of Scientific Instruments, 2008Co-Authors: J B Greenly, D A Hammer, B R Kusse, S C Glidden, J D Douglas, Howard D SandersAbstract:COBRA is a 0.5 Omega pulse generator driving Loads of order 10 nH inductance to >1 MA current. The design is based on independently timed, laser-triggered switching of four water pulse-forming lines whose outputs are added in parallel to drive the Load current pulse. The detailed design and operation of the switching to give a wide variety of current pulse shapes and rise times from 95 to 230 ns is described. The design and operation of a simple Inductive Load voltage monitor are described which allows good accounting of Load impedance and energy dissipation. A method of eliminating gas bubbles on the underside of nearly horizontal insulator surfaces in water was required for reliable operation of COBRA; a novel and effective solution to this problem is described.
Rahimi Baharom - One of the best experts on this subject based on the ideXlab platform.
-
Development of four quadrant operation of DC to DC converter using single phase matrix converter
Institute of Advanced Engineering and Science, 2019Co-Authors: Rahimi Baharom, Abdul Muin AwangAbstract:<span>Single-Phase Matrix Converter (SPMC) is an advanced circuit topology that offer advantages such as the capability to regenerate energy back to the input, sinusoidal input and output current and a manageable input current displacement factor. By considering the opportunity of an advanced SPMC topology, further exploration on DC to DC operation is proposed. The four-quadrant operation of switching algorithm was developed to control the SPMC circuit. The voltage and current profile of each quadrant was investigated to validate the proposed switching control algorithm. As part of four quadrants DC to DC operation, the safe commutation switching algorithm was also developed in order to solve the commutation problem due to the used of an Inductive Load. The pulse width modulation (PWM) techniques was utilized to synthesize the output of the proposed converter. Results from MATLAB/Simulink are presented to validate the proposed circuit operation.</span>
-
a new single phase controlled rectifier using single phase matrix converter topology incorporating active power filter
International Electric Machines and Drives Conference, 2007Co-Authors: Rahimi Baharom, M K HamzahAbstract:This paper presents application of single-phase matrix converter (SPMC) as a single-phase AC-DC controlled rectifier incorporating active power filter to ensure that the supply current is continuous, sinusoidal and in phase with the voltage. For basic rectifier operation, PWM technique was used to calculate the switch duty ratio to synthesize the output. Safe commutation strategy was developed to avoid voltage spikes due to Inductive Load. Basic Loads represented by R Load, RL Load and non-linear Loads are used for this investigation. Selected simulations and experimental results are presented to verify the proposed concept.
-
a new single phase controlled rectifier using single phase matrix converter
IEEE International Power and Energy Conference, 2006Co-Authors: Rahimi Baharom, Ahmad Shukri Abu Hasim, M K Hamzah, Mohamad Fauzi OmarAbstract:This paper presents the applications of single-phase matrix converter (SPMC) as an AC-DC controlled rectifier. For basic operation the multiple-PWM technique was used to calculate the switch duty ratio to synthesize the output. Safe commutation strategy was developed to avoid voltage spikes due to Inductive Load. Active current wave-shaping technique are also proposed to ensure that the supply current waveform is continuous, sinusoidal and in phase with the supply voltage. This approach utilizes boost rectifier technique for compensation. Selected experimental results are presented to verify the concept.
Hengming Tai - One of the best experts on this subject based on the ideXlab platform.
-
bipolar steep pulse current source for highly Inductive Load
IEEE Transactions on Power Electronics, 2016Co-Authors: Xuegui Zhu, Hengming TaiAbstract:A bipolar pulse current source is proposed for a highly Inductive Load. The current source exploits a nonInductive capacitor to store or release the energy back to and from Inductive Load during switching on or off of power inverter. A boost module is designed at the dc side of inverter to supplement the required energy gap so that edge steepness of the Load current can be improved. The capacitor and boost elements are configured based on the analysis of capacitor impact on the Load current and boost inductor current. The stability of Load current can be guaranteed by the multiple driving pulses generated from closed-loop control of boost switch, regardless of Load changes or initial pulse width offset. An experiment prototype is built to generate a flat-top 20 A current with the 200 μs rise/fall time for an Inductive Load of 2 mH or higher. Due to the steep rising and falling edges, the Inductive Load can realize high-frequency pulse currents. Moreover, the steep pulse current source can excite strong magnetic field, which make it especially useful for the Inductive coils of high-power geophysical transient electromagnetic method (TEM) transmitter.
Jose Luis Calvorolle - One of the best experts on this subject based on the ideXlab platform.
-
simplified method based on an intelligent model to obtain the extinction angle of the current for a single phase half wave controlled rectifier with resistive and Inductive Load
Journal of Applied Logic, 2015Co-Authors: Jose Luis Calvorolle, Hector Quintianpardo, Emilio Corchado, Maria Del Carmen Meizosolopez, Ramon Ferreiro GarciaAbstract:With the aim of calculating the extinction angle of the current of a single-phase half wave controlled rectifier with resistive and Inductive Load, present work shows a method to obtain a regression model based on intelligent methods. This type of circuit is a typical non-linear case of study that requires a hard work to solve it by hand. To create the intelligent model, a dataset has been obtained with a computational method for the working range of the circuit. Then, with the dataset, to achieve the final solution, several methods of regression were tested from traditional to intelligent types. The model was verified empirically with electronic circuit software simulation, analytical methods and with a practical implementation. The advantage of the proposed method is its low computational cost. Then, the final solution is very appropriate for applications where high computational requirements are not possible, like low-performance microcontrollers or web applications.
-
intelligent model to obtain current extinction angle for a single phase half wave controlled rectifier with resistive and Inductive Load
Soft Computing, 2013Co-Authors: Jose Luis Calvorolle, Emilio Corchado, Hector Quintian, Ramon FerreirogarciaAbstract:The present work show the model of regression based on intelligent methods. It has been created to obtain current extinction angle for a half wave controlled rectifier. The system is a typically non-linear case of study that requires a hard work to solve it manually. First, all the work points are calculated for the operation range. Then with the dataset, to achieve the final solution, several methods of regression have been tested from traditional to intelligent types. The model is verified empirically with electronic circuit software simulation and analytical methods. The model allows obtaining good results in all the operating range.
J B Greenly - One of the best experts on this subject based on the ideXlab platform.
-
a 1 ma variable risetime pulse generator for high energy density plasma research
Review of Scientific Instruments, 2008Co-Authors: J B Greenly, J Douglas, D A Hammer, B R Kusse, S C Glidden, Howard D SandersAbstract:COBRA is a 0.5Ω pulse generator driving Loads of order 10nH inductance to >1MA current. The design is based on independently timed, laser-triggered switching of four water pulse-forming lines whose outputs are added in parallel to drive the Load current pulse. The detailed design and operation of the switching to give a wide variety of current pulse shapes and rise times from 95to230ns is described. The design and operation of a simple Inductive Load voltage monitor are described which allows good accounting of Load impedance and energy dissipation. A method of eliminating gas bubbles on the underside of nearly horizontal insulator surfaces in water was required for reliable operation of COBRA; a novel and effective solution to this problem is described.
-
a 1 ma variable risetime pulse generator for high energy density plasma research
Review of Scientific Instruments, 2008Co-Authors: J B Greenly, D A Hammer, B R Kusse, S C Glidden, J D Douglas, Howard D SandersAbstract:COBRA is a 0.5 Omega pulse generator driving Loads of order 10 nH inductance to >1 MA current. The design is based on independently timed, laser-triggered switching of four water pulse-forming lines whose outputs are added in parallel to drive the Load current pulse. The detailed design and operation of the switching to give a wide variety of current pulse shapes and rise times from 95 to 230 ns is described. The design and operation of a simple Inductive Load voltage monitor are described which allows good accounting of Load impedance and energy dissipation. A method of eliminating gas bubbles on the underside of nearly horizontal insulator surfaces in water was required for reliable operation of COBRA; a novel and effective solution to this problem is described.