8/19/2019 59.Industrial Power Control by Integral Cycle
Switching Without Generating Harmonics
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PROJECT DESCRIPTION
The project is designed to achieve integral cycle switching, a
ethod to reove
whole cycle, cycles or portions o! cycles o! an "C signal# It is
a well$%nown and
old ethod o! controlling "C power, especially across linear
loads s&ch as heaters
&sed in electric !&rnace#
'owever the concept o! achieving the cycle stealing o! voltage
wave!or (y &se o!
icrocontroller can (e very precise as per the progra written in
asse(ly ) C
lang&age so that the act&al tie$average voltage or
c&rrent e*perienced at the load
is proportionately lower than the whole signal i! applied to the
load#
In place o! a linear load to (e &sed in the o&tp&t,
a series otor or lap can (e
&sed to veri!y the o&tp&t# One side e!!ect o!
&tili+ing this schee is an i(alance in
the inp&t c&rrent or voltage wave!or as the cycles are
switched on and o!! acrossthe load#
In this project we are &sing coparator !or +ero crossing
detection which is !ed as
an interr&pt to icrocontroller o! -./ !aily# 'ere the
icrocontroller delivers
the o&tp&t (ased on the interr&pt received as the
re!erence !or generating triggering
p&lses#
0sing these p&lses, we drive the opto$isolators !or
triggering the TRI"C to achieveintegral cycle control as per the
inp&t switches inter!aced to the icrocontroller# "
lap is provided in this project in place o! a otor !or
deonstration p&rpose#
1&rther this project can (e enhanced (y &sing !eed(ac%
echanis to
a&toatically aintain desired o&tp&t to the load (y
appropriate cycle stealing#
