AC16FGM Teccor Electronics, AC16FGM Datasheet - Page 178

• Manufacturer Part Number: AC16FGM
• Manufacturer: Teccor Electronics

AN1007
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
Figure AN1007.16
Figure AN1007.17
http://www.teccor.com
[phone]
0.1 µF
10 K
0.001
100
0.01
10
1.0
0.1
10ms
0.01 µF
4
2
5
3
100ms
555 timer circuit with 10 second delay
Resistor (R) and capacitor (C) combination curves
I R motion control circuit
555
8
1
1ms
6
7
1N4740
1 K
10ms
t d TIME DELAY (s)
-10 V
10 M
1 µF
R
AC+
AC
110
C
100ms
OVERRIDE
Q2008L4
ON/OFF
TRIAC
SW1
3.5 K
Q1
MT2
250 V
1.0
G
68W 2W
MT1
Lamp
60 to
Watt
R14
LP1
600
LOAD
1N4003
_
+
10
10 µF
1N4002
C8
0.1µF
0.33µF
350V
1N4002
C10
D2
1M
R9
D3
100
1N4002
D5
120 V
60 Hz
R9
1M
C11
330µF
1N4002
2.4M
12V
D1
R2
D4
*R10
AN1007 - 6
R7
1M
R8 569K
100pF
CDS
R13
C3
SW2
Mode
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.
3900pF
C7
C1
100µF
1
2
4
5
6
3
7
8
TRIAC
OSCD
OSCS
CDS
MODE
VDD
VSS
ZC
-16 DIP/SOP
HT761XB
U2
100µF
C4
OP2N
OP20
OP2P
OP1N
OP1P
RSTB
OP10
VEE
16
15
14
13
12
10
11
9
G
3
0.02µF
22µF
R6
1M
C12
C13
56K
D
R3
1
S
C5
0.02µF
2
U1
PIR
SD622
(Nippon
Ceramic)
R12
22K
22µF
C6
C9
10µF
C2
0.02µF
R5
22K
R4
1M
©2002 Teccor Electronics
Thyristor Product Catalog
Application Notes