AC08FSM datasheet(178/223 Pages) TECCOR

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AN1007

Application Notes

http://www.teccor.com

AN1007 - 6

+1 972-580-7777

Thyristor Product Catalog

Time Delay Relay Circuit

By combining a 555 timer IC with a triac, various time delays of

several seconds can be achieved for delayed activation of solid

state relays or switches. Figure AN1007.15 shows a solid state

timer delay relay using a sensitive gate triac and a 555 timer IC.

The 555 timer precisely controls time delay of operation using an

external resistor and capacitor, as illustrated by the resistor and

capacitor combination curves. (Figure AN1007.16)

Figure AN1007.15

555 timer circuit with 10 second delay

Figure AN1007.16

Resistor (R) and capacitor (C) combination curves

IR Motion Control

An example of a more complex triac switch is an infrared (IR)

motion detector controller circuit. Some applications for this cir-

cuit are alarm systems, automatic lighting, and auto doorbells.

Figure AN1007.17 shows an easy- to-implement automatic light-

ing system using an infrared motion detector control circuit. A

commercially available LSI circuit HT761XB, from Holtek, inte-

grates most of the analog functions. This LSI chip, U2, contains

the op amps, comparators, zero crossing detection, oscillators,

and a triac output trigger. An external RC that is connected to the

OSCD pin determines the output trigger pulse width. (Holtek

Semiconductor Inc. is located at No.3, Creation Road II, Science-

Based Industrial Park, Hsinchu, Taiwan, R.O.C.) Device U1 pro-

vides the infrared sensing. Device R13 is a photo sensor that

serves to prevent inadvertent triggering under daylight or other

high light conditions.

Choosing the right triac depends on the load characteristics. For

example, an incandescent lamp operating at 110 V requires a

200 V, 8 A triac. This gives sufficient margin to allow for the high

current state during lamp burn out. U2 provides a minimum out-

put triac negative gate trigger current of 40 mA, thus operating in

QII & QIII. This meets the requirements of a 25 mA gate triac.

Teccor also offers alternistor triacs for inductive load conditions.

This circuit has three operating modes (ON, AUTO, OFF), which

can be set through the mode pin. While the LSI chip is working in

the auto mode, the user can override it and switch to the test

mode, or manual on mode, or return to the auto mode by switch-

ing the power switch. More information on this circuit, such as

mask options for the infrared trigger pulse and flash options, are

available in the Holtek HT761X General Purpose PIR Controller

specifications.

Figure AN1007.17

I R motion control circuit

555

10 K

0.1 µF

0.01 µF

1 µF

1 K

LOAD

MT2

MT1

10 M

1N4740

3.5 K

10 µF

1N4003

-10 V

250 V

120 V

60 Hz

10ms

100ms

1ms

10ms

100ms

1.0

100

0.001

0.01

0.1

1.0

100

td TIME DELAY (s)

PIR

SD622

(Nippon

Ceramic)

100µF

56K

C13

0.02µF

C12

22µF

R12

22K

10µF

0.02µF

100µF

TRIAC

Q2008L4

LP1

Lamp

60 to

600

Watt

0.1µF

1N4002

SW1

ON/OFF

OVERRIDE

AC+

110

R8 569K

100pF

3900pF

VSS

TRIAC

OSCD

OSCS

CDS

MODE

VDD

OP20

OP2N

OP2P

OP10

OP1N

OP1P

RSTB

VEE

HT761XB

-16 DIP/SOP

0.02µF

22µF

22K

SW2

Mode

2.4M

1N4002

*R10

12V

R13

CDS

C11

330µF

1N4002

C10

0.33µF

350V

R14

68W 2W

1N4002

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