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參數資料
| 型號： | U211B3 |
| 英文描述： | Phase Control Circuit - General Purpose Feedback |
| 中文描述： | 相位控制電路-通用信息反饋 |
| 文件頁數： | 6/20頁 |
| 文件大小： | 322K |
| 代理商： | U211B3 |
U211B2/ B3
TELEFUNKEN Semiconductors
Rev. A1, 29-May-96
6 (20)
Design Hints
Practical trials are normally needed for the exact
determination of the values of the relevant components in
the load limiting. To make this evaluation easier, the
following table shows the effect of the circuitry on the
important parameters of the load limiting and summarises
the general tendencies.
Parameters
Component affected
R
10
increases
increases
increases
n.e.
n.e.
R
9
decreases
decreases
n.e.
decreases
increases
C
9
n.e.
n.e.
n.e.
increases
increases
P
max
P
min
P
max
/
min
t
d
t
r
P
max
P
min
t
d
t
r
n.e
– maximum continuous power dissipation
– power dissipation with no rotation
– operation delay time
– recovery time
– no effect
P
1
= f
(n)
n
P
1
= f
(n)
n = 0
0
Pulse Output Stage
The pulse output stage is short circuit protected and can
typically deliver currents of 125 mA. For the design of
smaller triggering currents, the function I
GT
= f(R
GT
) has
been given in the data sheets in the appendix.
Automatic Retriggering
The variable automatic retriggering prevents half cycles
without current flow, even if the triac is turned off earlier
e.g. due to a collector which is not exactly centered (brush
lifter) or in the event of unsuccessful triggering. If it is
necessary, another triggering pulse is generated after a
time lapse which is determined by the repetition rate set
by resistance between Pin 5 and Pin 3 (R
5-3
). With the
maximum repetition rate (Pin 5 directly connected to
Pin 3), the next attempt to trigger comes after a pause of
4.5 t
p
and this is repeated until either the triac fires or the
half-cycle finishes. If Pin 5 is connected, then only one
trigger pulse per half-cycle is generated. Because the
value of R
5-3
determines the charging current of C
2
, any
repetition rate set using R
5-3
is only valid for a fixed value
of C
2
.
General Hints and Explanation of Terms
To ensure safe and trouble-free operation, the following
points should be taken into consideration when circuits
are being constructed or in the design of printed circuit
boards.
–
The connecting lines from C
2
to Pin 7 and Pin 2
should be as short as possible: The connection to Pin 2
should not carry any additional high current such as
the load current. When selecting C
2
, a low
temperature coefficient is desirable.
–
The common (earth) connections of the set-point
generator, the tacho-generator and the final
interference suppression capacitor C
4
of the f/V
converter should not carry load current.
–
The tacho-generator should be mounted without
influence by strong stray fields from the motor.
–
The connections from R
10
and C
5
should be as short
as possible.
To achieve a high noise immunity, a maximum ramp
voltage of 6 V should be used.
The typical resistance R can be calculated from I as
follows:
T(ms)
C nF)
T =
Period duration for mains frequency
(10 ms at 50 Hz)
C = Ramp capacitor, max. ramp voltage 6 V
and constant voltage drop at R = 1.13 V.
A 10% lower value of R (under worst case conditions)
is recommended.
R (k )
1.13(V)
10
3
6(V)
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