![[INC 281 MULTIDISCIPLINARY WORKSHOP WEEKLY REPORT] March 21, 2012
Name-Surname Surachai Saelim
Student ID. 53211845
Group Name IS company
Engineering Team Tossaphon (13), Thanunya (15), Punnipa (22), Mutchima
Members (24)
Product Design
P’Satang, Tip, Ped, fon, erng, best, mild
Team Members
Weekly Progress
Explain your engineering job of each week.
TRIACs are notorious for not firing symmetrically. This
means these usually won't trigger at the exact same gate
voltage level for one polarity as for the other. Generally
speaking, this is undesirable, because unsymmetrical firing
results in a current waveform with a greater variety of
harmonic frequencies. Waveforms that are symmetrical above
and below their average centerlines are comprised of only
odd-numbered harmonics. Unsymmetrical waveforms, on the
other hand, contain even-numbered harmonics
DIAC breakover voltages tend to be much more
symmetrical (the same in one polarity as the other) than
TRIAC triggering voltage thresholds. Since the DIAC prevents
any gate current until the triggering voltage has reached a
certain, repeatable level in either direction, the firing point of
the TRIAC from one half-cycle to the next tends to be more
consistent, and the waveform more
symmetrical above and below its
centerline.
A typical diac-triac circuit used for
smooth control of ac power to a
heater is shown in figure. The triac
conduction angle is adjusted by adjusting the potentiometer
R2. The longer the triac conducts, the larger the output will be
from the heater. Thus a smooth control of the heat output
from the heater is obtained.
Engineering Analysis
Strong Point
- Check specification of component such as triac about Vdrm ,It(max), Ih, Igt, Vgt.
Week Point
-
Department of Control System and Instrumentation Engineering
KING MONGKUT’s UNIVERSITY OF TECHNOLOGY THONBURI](https://image.slidesharecdn.com/21-03-55-120320233813-phpapp01/85/21-0355-1-320.jpg)
![[INC 281 MULTIDISCIPLINARY WORKSHOP WEEKLY REPORT] March 21, 2012
Next Week Job
Begins to buy equipments and test it.
Department of Control System and Instrumentation Engineering
KING MONGKUT’s UNIVERSITY OF TECHNOLOGY THONBURI](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
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- 1. [INC 281 MULTIDISCIPLINARY WORKSHOP WEEKLY REPORT] March 21, 2012 Name-Surname Surachai Saelim Student ID. 53211845 Group Name IS company Engineering Team Tossaphon (13), Thanunya (15), Punnipa (22), Mutchima Members (24) Product Design P’Satang, Tip, Ped, fon, erng, best, mild Team Members Weekly Progress Explain your engineering job of each week. TRIACs are notorious for not firing symmetrically. This means these usually won't trigger at the exact same gate voltage level for one polarity as for the other. Generally speaking, this is undesirable, because unsymmetrical firing results in a current waveform with a greater variety of harmonic frequencies. Waveforms that are symmetrical above and below their average centerlines are comprised of only odd-numbered harmonics. Unsymmetrical waveforms, on the other hand, contain even-numbered harmonics DIAC breakover voltages tend to be much more symmetrical (the same in one polarity as the other) than TRIAC triggering voltage thresholds. Since the DIAC prevents any gate current until the triggering voltage has reached a certain, repeatable level in either direction, the firing point of the TRIAC from one half-cycle to the next tends to be more consistent, and the waveform more symmetrical above and below its centerline. A typical diac-triac circuit used for smooth control of ac power to a heater is shown in figure. The triac conduction angle is adjusted by adjusting the potentiometer R2. The longer the triac conducts, the larger the output will be from the heater. Thus a smooth control of the heat output from the heater is obtained. Engineering Analysis Strong Point - Check specification of component such as triac about Vdrm ,It(max), Ih, Igt, Vgt. Week Point - Department of Control System and Instrumentation Engineering KING MONGKUT’s UNIVERSITY OF TECHNOLOGY THONBURI
- 2. [INC 281 MULTIDISCIPLINARY WORKSHOP WEEKLY REPORT] March 21, 2012 Next Week Job Begins to buy equipments and test it. Department of Control System and Instrumentation Engineering KING MONGKUT’s UNIVERSITY OF TECHNOLOGY THONBURI