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PDF U211B3 Data sheet ( Hoja de datos )

Número de pieza U211B3
Descripción Phase Control Circuit - General Purpose Feedback
Fabricantes TEMIC Semiconductors 
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U211B2/ B3
Phase Control Circuit - General Purpose Feedback
Description
The integrated circuit U211B2/ B3 is designed as a phase
control circuit in bipolar technology with an internal fre-
quency-voltage converter. Furthermore, it has an internal
control amplifier which means it can be used for speed-
regulated motor applications.
Features
D Internal frequency-to-voltage converter
D Externally-controlled integrated amplifier
D Overload limitation with a “fold back” characteristic
D Optimized soft-start function
D Tacho monitoring for shorted and open loop
D Automatic retriggering switchable
It has an integrated load limitation, tacho monitoring and
soft-start functions, etc. to realize sophisticated motor
control systems.
D Triggering pulse typ. 155 mA
D Voltage and current synchronization
D Internal supply-voltage monitoring
D Temperature reference source
D Current requirement 3 mA
Package: DIP18 - U211B2,
SO16 - U211B3
17(16)
1(1)
Voltage / Current
detector
5*)
Automatic
retriggering
Output
pulse
4(4)
11(10)
Control
+ amplifier
10(9)
14(13)
15(14)
Load limitation
speed / time
controlled
Phase
control unit
ö= f (V12)
Supply
voltage
limitation
Reference
voltage
Voltage
monitoring
6(5)
7(6)
3(3)
–VS
2(2)
GND
16(15)
controlled
current sink
Soft start
–VRef
12(11)
13(12)
Frequency-
to-voltage
converter
Pulse-blocking
tacho
monitoring
9(8) 8(7)
18*)
95 10360
Figure 1. Block diagram (Pins in brackets refer to SO16)
*) Pins 5 and 18 connected internally
TELEFUNKEN Semiconductors
Rev. A1, 29-May-96
1 (20)

1 page




U211B3 pdf
U211B2/ B3
R = 1 MW
C = 1 mF
10 V
18 17 16
15
1234
95 10363
Figure 5. Operation delay
Control Amplifier (Figure 2)
The integrated control amplifier with differential input
compares the set value (Pin 11) with the instantaneous
value on Pin 10 and generates a regulating voltage on the
output Pin 12 (together with the external circuitry on
Pin 12) which always tries to hold the actual voltage at the
value of the set voltages. The amplifier has a
mtransmittance of typically 1000 A/V and a bipolar
mcurrent source output on Pin 12 which operates with
typically ±110 A. The amplification and frequency
response are determined by R7, C7, C8 and R11 (can be left
out). For open loop operation, C4, C5, R6, R7, C7, C8 and
R11 can be omitted. Pin 10 should be connected with
Pin 12 and Pin 8 with Pin 2. The phase angle of the
triggering pulse can be adjusted using the voltage on
Pin 11. An internal limitation circuit prevents the voltage
on Pin 12 from becoming more negative than V16 + 1 V.
Load Limitation
The load limitation, with standard circuitry, provides
absolute protection against overloading of the motor. the
function of the load limiting takes account of the fact that
motors operating at higher speeds can safely withstand
large power dissipations than at lower speeds due to the
increased action of the cooling fan. Similary, consider-
ations have been made for short term overloads for the
motor which are, in practice, often required. These
finctions are not damaging and can be tolerated.
In each positive half-cycle, the circuit measures via R10
the load current on Pin 14 as a potential drop across R8
and produces a current proportional to the voltage on
Pin 14. This current is available on Pin 15 and is
integrated by C9. If, following high current amplitudes or
a large phase angle for current flow, the voltage on C9
exceeds an internally set threshold of approx. 7.3 V
(reference voltage Pin 16) then a latch is set and the load
limiting is turned on. A current source (sink) controlled
by the control voltage on Pin 15 now draws current from
a aPin 12 and lowers the control voltage on Pin 12 so that the
phase angle is increased to max.
The simultaneous reduction of the phase angle during
which current flows causes firstly: a reduction of the
rotational speed of the motor which can even drop to zero
if the angular momentum of the motor is excessively
large, and secondly: a reduction of the potential on C9
which in turn reduces the influence of the current sink on
Pin 12. The control voltage can then increase again and
bring down the phase angle. This cycle of action sets up
a “balanced condition” between the “current integral” on
Pin 15 and the control voltage on Pin 12.
Apart from the amplitude of the load current and the time
during which current flows, the potential on Pin 12 and
hence the rotational speed also affects the function of the
load limiting. A current proportional to the potential on
Pin 10 gives rise to a voltage drop across R10, via Pin 14,
so that the current measured on Pin 14 is smaller than the
actual current through R8.
This means that higher rotational speeds and higher
current amplitudes lead to the same current integral.
Therefore, at higher speeds, the power dissipation must
be greater than that at lower speeds before the internal
threshold voltage on Pin 15 is exceeded. The effect of
speed on the maximum power is determined by the
resistor R10 and can therefore be adjusted to suit each
individual application.
If, after the load limiting has been turned on, the
momentum of the load sinks below the “o-momentum”
set using R10, then V15 will be reduced. V12 can then in-
crease again so that the phase angle is reduced. A smaller
phase angel corresponds to a larger momentum of the mo-
tor and hence the motor runs up - as long as this is allowed
by the load momentum. For an already rotating machine,
the effect of rotation on the measured “current integral”
ensures that the power dissipation is able to increase with
the rotational speed. the result is: a current controlled
accelleration run-up., which ends in a small peak of accel-
leraton when the set point is reached. The latch of the load
limiting is simultaneously reset. The speed of the motor
is then again under control and it is capable of carrying its
full load. The above mentioned peak of accelleration
depends upon the ripple of actual speed voltage. A large
amount of ripple also leads to a large peak of
accelleration.
The measuring resistor R8 should have a value which
ensures that the amplitude of the voltage across it does not
exceed 600 mV.
TELEFUNKEN Semiconductors
Rev. A1, 29-May-96
5 (20)

5 Page





U211B3 arduino
240
200
10nF 4.7nF
160
Phase Control
Reference Point Pin 2
2.2nF
120
C ö/t=1.5nF
80
0
0
95 10302
0.2 0.4 0.6
Rö ( MW )
Figure 7.
0.8 1.0
100
Soft Start
80
60
40
20
f/V-Converter Non Active
Reference Point Pin 16
0
02 4 6
95 10303
V13 ( V )
Figure 8.
8 10
100
Soft Start
80
f/V-Converter Active
Reference Point Pin 16
60
40
20
0
0
95 10304
246
V13 ( V )
Figure 9.
8 10
TELEFUNKEN Semiconductors
Rev. A1, 29-May-96
U211B2/ B3
10
8
Soft Start
6
4
2
0
95 10305
f/V-Converter Non Active
Reference Point Pin 16
t=f(C3)
Figure 10.
10
Soft Start
8
f/V-Converter Active
Reference Point Pin 16
6
4
2
0
95 10306
t=f(C3)
Figure 11.
10
Soft Start
8
Reference Point Pin 16
6
95 10307
4
2
0
t=f(C3)
Motor Standstill ( Dead Time )
Motor in Action
Figure 12.
11 (20)

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