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| 型號(hào)： | BCR3AS-12 |
| 英文描述： | Thyristor Product Catalog |
| 中文描述： | 晶閘管產(chǎn)品目錄 |
| 文件頁(yè)數(shù)： | 178/224頁(yè) |
| 文件大?。?/td> | 2697K |
| 代理商： | BCR3AS-12 |
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AN1007
Application Notes
http://www.teccor.com
+1 972-580-7777
AN1007 - 6
2002 Teccor Electronics
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
G
10 M
1N4740
3.5 K
10 μF
+
_
1N4003
-10 V
250 V
120 V
60 Hz
4
2
5
3
8
1
6
7
R
C
10ms
100ms
1ms
10ms
td TIME DELAY (s)
100ms
1.0
10
100
0.001
0.01
0.1
1.0
10
100
C
1K
10K
100K
1M
10M
S
G
D
U1
PIR
SD622
(Nippon
Ceramic)
1
3
C4
100μF
56K
R3
2
C13
0.02μF
C12
22μF
R12
22K
C9
10μF
C2
0.02μF
R4
1M
C1
100μF
Q1
TRIAC
Q2008L4
AC
LP1
Lamp
60 to
600
Watt
C8
0.1μF
D3
1N4002
SW1
ON/OFF
OVERRIDE
AC+
110
R9
1M
R7
1M
R8 569K
C3
100pF
C7
3900pF
U2
VSS
TRIAC
OSCD
OSCS
ZC
CDS
MODE
VDD
OP20
OP2N
OP2P
OP10
OP1N
OP1P
RSTB
VEE
1
2
3
4
5
6
7
8
HT761XB
-16 DIP/SOP
9
10
11
12
13
14
15
16
R6
1M
0.02μF
C5
C6
22μF
R5
22K
SW2
Mode
O
A
O
R2
2.4M
D4
1N4002
*R10
D1
12V
R13
CDS
C11
330μF
D2
1N4002
C10
0.33μF
350V
R14
68W 2W
R9
1M
D5
1N4002
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