AC08FSM datasheet(141/223 Pages) TECCOR

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Application Notes

AN1003

AN1003 - 9

http://www.teccor.com

Thyristor Product Catalog

+1 972-580-7777

Figure AN1003.24

Microcontroller Heater Control

Summary

The load currents chosen for the examples in this application

note were strictly arbitrary, and the component values will be the

same regardless of load current except for the power triac or

SCR. The voltage rating of the power thyristor devices must be a

minimum of 200 V for 120 V input voltage and 400 V for 240 V

input voltage.

The use of alternistors instead of triacs may be much more

acceptable in higher current applications and may eliminate the

need for any dv/dt snubber network.

For many electrical products in the consumer market, competitive

thyristor prices and simplified circuits make automatic control a

possibility. These simple circuits give the designer a good feel for

the nature of thyristor circuits and their design. More sophistica-

tion, such as speed and temperature feedback, can be devel-

oped as the control techniques become more familiar. A

remarkable phenomenon is the degree of control obtainable with

very simple circuits using thyristors. As a result, industrial and

consumer products will greatly benefit both in usability and mar-

ketability.

120VAC

(HIGH)

(RETURN)

WHITE

RV1

VARISTOR

.1µF

+5V

2000 W

1N4001

20M

1N5231

220µF

.01µF

VDD

GP5

GP4

GP3

VSS

GP0

GP1

GP2

470

R70

100

Ω

L4X8E5

Q4025L6

470

INCREASE HEAT

DECREASE HEAT

VDD

12C508

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