Got a tricky question? Receive an answer from students like you! Try us!

Chopper Control - Essay Example

Only on StudentShare
Masters
Essay
Technology
Pages 12 (3012 words)

Summary

There are two forms of electrical energy supplies namely; AC (Alternating Current) and DC (Direct Current). In Ac power supplies both the voltage and the current vary in magnitude with time whereas in DC power supplies both the voltage and the current are constant i.e…

Extract of sample
Chopper Control

Converters can be made using different technologies which depend on; the type of semiconductor devices used and the power ratings of the load. Several semi conductor devices are used such as the diodes, Thyristors, Triacs, GTO (gate turn off) among others (Gureich, 2008).
Thyristor or Silicon Controlled Rectifiers (SCRs) have been the traditional workhorses for bulk power conversion and control in industry. The Thyristor came from its gas tube equivalent, thyratron. Often it is a family name that includes SCRs, Triac, GTO, MCT and IGCT. A Thyristor is a controlled rectifier where the unidirectional current flow from anode to cathode is initiated by a small signal current from gate to cathode. Thyristors are classified as standard or slow-phase-control-type and fast switching, voltage fed inverter type (Ulrich et al, 1998).
Initially, when forward voltage is applied across a device, the off-state, or static dv / dt, must be limited so that it does not switch on spuriously. The dv / dt creates displacement current in the depletion layer capacitance of the middle junction, which induces emitter current in the component transistors and causes switching action (Dorf, 1997). When the device turns on; the anode current di / dt can be excessive, which can destroy the device by heavy current concentration. ...
Download paper
Not exactly what you need?

Related Essays

Programmable control engineering
In succession from the PC could be spread out through a company's local area network or web functioning client-server expertise. Presently, with the convergence of underlying microprocessor expertise as well as software programming techniques, myriad users find that PLCs offers an economic resolve to real time regulation in diminutive- to medium sized process plants principally when integrated with regulatory PCs employing hybrid structures. The main work of this article illustrates that programmable logic circuits are responsive to quick and repetitious organized errands, that runs on PCs…
20 pages (5020 words)
AUTONOMOUS GROUND VEHICLE CONTROL
Thus, under an autonomous situation, a controller must be able to manage problems not only with the software but also fix problems arising in the hardware. He also believes that the process of developing a controller with artificial intelligence is evolutionary, ie. each model must evolve as an improvement over the previous one through continuous improvements and compilation and coordination of research results in various related fields. For the design and concept, research and concepts would be relevant from the fields of control, estimation, communication theory, computer science,…
4 pages (1004 words)