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PDF ( 数据手册 , 数据表 ) OM1682

零件编号 OM1682
描述 Precision Triac Control Thermostat
制造商 IES
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OM1682 数据手册, 描述, 功能
Draft Data Sheet
INTEGRATED CIRCUIT
2004 Jul 26
OM1682
OM1682A
Pwrewciwsio.Dn atrtiaacSchoenterot4l tUhe.rcmoomstat
INTEGRATED ELECTRONIC SOLUTIONS
1BUTLER DRIVE
HENDON SA 5014
AUSTRALIA
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OM1682 pdf, 数据表
Integrated Electronic Solutions, Hendon, South Australia
Precision triac control thermostat
Draft Data Sheet
OM1682 OM1682A
An imbalance (apart from that
resulting from the action of the
sensor) between the currents applied
to SA and SB can be created by an
additional resistive path that
introduces an AC signal from the AC
signal across the triac when it is off to
add to the signal already present in
SA or SB. This imbalance can be
used to increase the hysteresis
around the control point, or to
decrease it and to force more
frequent cycling between the ON and
OFF cycles. In the application circuit
where the sensor is powered from
across the triac (OFF period) or from
across the load (ON) then suitable
selection of fixed resistor values give
this electronically induced imbalance.
The timing capacitor connected to the
CAP terminal provides inherent
filtering of the sensing signal, and as
the SA and SB inputs are driven by
AC signals, filtering of transient
interference signals is inherent in this
circuit. However they may also be
driven from a positive DC source-
possibly from a remote sensor with its
own power supply, and still have the
advantage of the inherent
interference rejecting characteristics
of the timing capacitor.
Only the positive half of the input
cycle is used to generate the
difference between SA and SB: on
the negative half cycle the voltage is
clamped to one VBE below the VCC
rail.
6.8 CAP - Timing capacitor
The timing capacitor is connected
from CAP to either VEE (substrate,
ve) or VCC (common, +ve). The
charging and discharge times of this
capacitor set the ON and OFF cycle
times and give minimum times
proportional to the capacitance
values as well as to the maximum
difference in current levels at which
the two sensor inputs are driven.
The charging and discharging
periods, that is the ON or OFF times,
vary with the magnitude of the
difference in input currents applied to
SA and SB from the sensor. When the
capacitor charges towards the VCC
rail, and reaches an upper threshold
of one VBE below the VCC rail, then
the request for firing latch is set in the
ON condition; the control circuit is
ready to start an ON cycle at the next
appropriate zero-crossing of the
mains supply. See figure 4, Sensor
Current Comparator Circuit.
The ON period is synchronised with
the mains zero crossing signals so
that with a resistive load an integral
number of full cycles makes up the
ON period, and no DC signal is
generated in the supply line. With an
reactive load the OM1682 uses either
an odd number of half cycles during
the ON period, with an even number
in the OFF period, or vice-versa. This
ensures that for an reactive load
every ON period starts by conducting
in the opposite direction to the first
half cycle of the previous ON period.
During the ON cycle, the imbalance in
the input signal currents that caused
the capacitor to charge to the upper
threshold voltage, will change, and
the new difference between the
signals into SA and SB discharges
the capacitor, with the voltage on the
CAP pin approaching the VEE rail.
The lower threshold is two VBE above
VEE, and when this threshold is
reached the latch which was set by
the request for an ON cycle is reset.
When the ON latch is reset, the timing
circuit stops driving the gate only after
the programmed even or odd number
of conducting half cycles.
PIN CONNECTION
RES
MOD
TYPE OF
LOAD
high (true) high (true) resistive
high (true) low (false) resistive
low (false) high (true) leading
low (false) low (false) leading
low (false) high (true) lagging
low (false) low (false) lagging
OPERATING MODE
Start on triac zero crossing, run on load signal zero crossing
Start and run on supply signal zero crossing
Odd number of ON half cycles, even number of OFF cycles
Even number of ON half cycles, odd number of OFF half cycles
Even number of ON half cycles, odd number of OFF half cycles
Odd number of ON half cycles, even number of OFF cycles
6.9 RES and MOD - Select
Resistive or Reactive load
firing
The OM1682 provides for four
different modes of operation; two for
use with resistive loads and two for
use with reactive loads. These modes
are selected by pins RES and MOD.
These pins are logically true when left
open (high) and false when shorted to
VEE (low). RES false (low) selects
the reactive modes.
6.9.1 RESISTIVE LOADS
With RES true (high) all triggering
occurs at zero crossings as sensed
by TS or LS, and both ON and OFF
periods have a duration of an integral
number of AC supply cycles. With a
2004 Jul 26
8







OM1682 equivalent, schematic
Integrated Electronic Solutions, Hendon, South Australia
Precision triac control thermostat
Draft Data Sheet
OM1682 OM1682A
Push
to
Run
R1 R2 R3
470k 220k 220k
VR25 VR37 VR37
230 V
ac
R8
470k
VR25
R9
100k
θ
NTC
10k
R5
220k
R6
220k
R7
3k6
RV1
Set
temp
4k7
R10
150k
VR37
R11
150k
VR37
R4 10M VR25
RES MOD SW
SA 6 3 2 1
Z1
BZX84
C20
PWR
13 10 LS
SB 7
CAP8
4
C2 LOT
220
nF
OM1682A
IC1
9 11
LIN VEE
16 TS
5 TRG
15
VCC
R12
150k
R13 220
HEATER
LOAD
230V
1500W
TRIAC
BT139F
600E
TR1
T5
BC858
R14
470k
VCC
D1A
BAV99
C1
RV2 Set time R17
1 to 4 hours 220k
1M
C4
100
µF
R16
100nF
D1B
BAV99
22k
R18
1M
A0 A1 VDD
RTC 1 12 13 14 10 MODE
CTC 2
RS 3
HEF4541B 9 PH
IC2
5 6 7 8O
AR MR VSS
R22
470 C6
k 100
nf
R23
220k
R24
T2
BC
858
T3
BC
848
470k
D2A
BAV
99
D2B
BAV
99
C3
100nF
VEE
R19
220k
R20
100k
T1
BC848
C5
10nF
R21
220k
R25
220k
R26
100k
T4
BC848
D3
BAS16
POWER LED
ON Yellow
TIMER LED
R15 ON
Green
470k
T6
BC848
LED
Red
HEATER
ON
Tmed-cct.ai
Fig.9 Application diagram: OM1682A with run timer and LED indication
2004 Jul 26
16










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