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
-
Next Week Job
Begins to buy equipments and test it.
Department of Control System and Instrumentation Engineering
KING MONGKUT’s UNIVERSITY OF TECHNOLOGY THONBURI
![[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
-
Next Week Job
Begins to buy equipments and test it.
Department of Control System and Instrumentation Engineering
KING MONGKUT’s UNIVERSITY OF TECHNOLOGY THONBURI](https://image.slidesharecdn.com/21-03-55-120320233953-phpapp01/85/21-0355-1-320.jpg)
