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Phase Control Circuit for Current Feedback
U2010B
Description
The U2010B is designed as a phase-control circuit in
bipolar technology. It enables load-current detection and
has a soft-start function as well as reference voltage
output. Motor control with load-current feedback and
overload protection are preferred applications.
Features
D Full wave current sensing
D Mains supply variation compensated
D Programmable load-current limitation
with over- and high-load output
D Variable soft-start
D Voltage and current synchronization
D Automatic retriggering switchable
D Triggering pulse typical 125 mA
Package: DIP16, SO16
D Internal supply voltage monitoring
vD Current requirement 3 mA
D Temperature compensated reference voltage
Applications
D Advanced motor control
D Grinder
D Drilling machine
Block Diagram
96 11646
15
Limiting
detector
Voltage
detector
14 13
Overload
Mains voltage
compensation
12
High load
11
Supply 10
voltage GND
Automatic
retriggering
Current
detector
16
Pulse
output
1
Load
current
detector
Phase
control unit
ö = f (V4)
Output
12
Full wave
rectifier
Level
shift
100% 70% amaxA
B9
Programmable Auto–
+ overload start
protection
C
Imax
Voltage
monitoring
Soft Reference
start voltage
2 3 45
67
8
Figure 1. Block diagram
TELEFUNKEN Semiconductors
Rev. A1, 28-May-96
1 (12)

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U2010B
Figure 2. Block diagram with external circuit
General Description
Mains Supply
The U2010B contains voltage limiting and can be
connected with the mains supply via D1 and R1. Supply
* *voltage between Pin 10 and Pin 11 is smoothed
by C1.
vIn the case of V6 (70% of overload threshold voltage),
v wPins 11 and 12 are connected internally whereby
Vsat 1.2 V. When V6 VT70, the supply current
flows across D3.
2 (12)
TELEFUNKEN Semiconductors
Rev. A1, 28-May-96

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U2010B
Pin Description
Isense
1
Isense
Cö
2
3
Control 4
Comp. 5
ILoad
Csoft
6
7
VRef
8
16 Output
15 VSync.
14 VRö
13 Overload
12 High load
11 VS
10 GND
9 Mode
95 11406
Pin Symbol
Function
1 Isense Load current sensing
2 Isense Load current sensing
3 Cö Ramp voltage
4 Control Control input
5 Comp. Compensation output
6 ILoad Load current limitation
7 Csoft Soft start
8 VRef Reference voltage
9 Mode Mode selection
10 GND Ground
11 VS Supply voltage
12 High load High load indication
13 Overload Overload indication
14 VRö Ramp current adjust
15 VSync. Voltage synchronization
16 Output Trigger output
Series resistance R1 can be calculated as follows:
Vmains
VSmax
Itot
ISmax
Ix
+R1max
Vmains – VSmax
2 Itot
whereas
+ Mains supply voltage
+ Maximum supply voltage
+ )Total current consumption = ISmax Ix
+ Maximum current consumption of the IC
+ Current consumption of the
external components
Voltage Monitoring
As the voltage is built up, uncontrolled output pulses are
avoided by internal voltage monitoring. Apart from that
all the latches in the circuit (phase control, load limit
regulation) are reset and the soft-start capacitor is short
circuited. This guarantees a specified start-up behavior
each time the supply voltage is switched on or after short
interruptions of the mains supply. Soft-start is initiated
after the supply voltage has been built up. This behavior
guarantees a gentle start-up for the motor and auto-
matically ensures the optimum run-up time.
Phase Control
The function of the phase control is largely identical to the
well known IC family U211B. The phase angle of the
trigger pulse is derived by comparing the ramp voltage V3
which is mains synchronized by the voltage detector with
the set value on the control input, Pin 4. The slope of the
ramp is determined by Cö and its charging current Iö. The
charging current can be varied using Rö at Pin 14. The
maximum phase angle, αmax, can also be adjusted by
using Rö (minimum current flow angle ömin) see figure 4.
When the potential on Pin 3 reaches the set point level of
Pin 4, a trigger pulse width, tp, is determined from the
value of Cö (tp = 9 ms/nF). At the same time, a latch is set
with the output pulse, as long as the automatic
retriggering has not been activated, then no more pulses
can be generated in that half cycle. Control input at Pin 4
(with respect to Pin 10) has an active range from
V8 to –1 V. When V4 = V8, then the phase angle is at its
wmaximum, αmax, i.e., the current flow angle is minimum.
The minimum phase angle, αmin, is set with V4 –1 V.
Automatic Retriggering
The current-detector circuit monitors the state of the triac
after triggering by measuring the voltage drop at the triac
gate. A current flow through the triac is recognized, when
the voltage drop exceeds a thres hold level of typ. 40 mV.
If the triac is quenched within the relevant half-wave after
triggering; for example owing to low load currents before
or after the zero crossing of current wave or; for commu-
tator motors, owing to brush lifters. Then the automatic
retriggering circuit ensures immediate retriggering, if
necessary with a high repetition rate, tpp/tp, until the triac
remains reliably triggered.
TELEFUNKEN Semiconductors
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U2010B
Current Synchronization
Current synchronization fulfils two functions:
* Monitoring the current flow after triggering.
In case the triac extinguishes again or it does not switch
on, automatic triggering is activated until the
triggering is successful.
* Avoiding a triggering due to inductive load.
In the case of inductive load operation the current
synchronization ensures that in the new half wave no
pulse is enabled as long as there is a current available
which from the previous half-wave, which flows from
the opposite polarity to the actual supply voltage.
A special feature of the integrated circuit is the
realization of this current synchronization. The device
evaluates the voltage at the pulse output between gate and
reference electrode of the triac. This results in saving
separate current synchronization input with specified
series resistance.
Voltage Synchronization with Mains Voltage
Compensation
The voltage detector synchronizes the reference ramp
with the mains-supply voltage. At the same time, the
mains dependent input current at Pin 15 is shaped and
rectified internally. This current activates the automatic
retriggering and at the same time is available at Pin 5. By
suitable dimensioning, it is possible to attain the specified
compensation effect. Automatic retriggering and mains
voltage compensation are not activated until |V15 10|
increases to 8 V. Resistance, Rsync. defines the width of
the zero voltage cross over pulse, synchronization
current, and hence the mains supply voltage
compensation current.
Mains
96 11648
If the mains voltage compensation and the automatic
vretriggering are not required, both functions can be
suppressed by limiting |V15 – 10| 7 V (figure 3).
Load Current Compensation
The circuit continuously measures the load current as a
voltage drop at resistance R6. The evaluation and use of
both half waves results in a quick reaction to load current
change. Due to voltage at resistance R6, there is a
difference between both input currents at Pins 1 and 2.
This difference controls the internal current source,
whose positive current values are available at Pins 5
and 6. The output current generated at Pin 5 contains the
difference from the load-current detection and from the
mains-voltage compensation (see figure 1).
The effective control voltage at Pin 4 is the final current
at Pin 5 together with the desired value network. An
increase of mains voltage causes the increase of control
angle α, an increase of load current results in a decrease
in the control angle. This avoiding a decrease in
revolution by increasing the load as well as the increase
of revolution by the increment of mains supply voltage.
Load Current Limitation
The total output load current is available at Pin 6. It
results in a voltage drop across R11. When the potential
of the load current reaches about 70% of the threshold
value (VT70) i.e., ca. 4.35 V at Pin 6, it switches the high
load comparator and opens the switch between Pins 11
and 12. By using an LED between these pins, (11 and 12)
a high load indication can be realized.
If the potential at Pin 6 increases to ca. 6.2 V (= VT100),
it switches the overload comparator. The result is
programmable at Pin 9 (operation mode).
R2
2x
BZX55
C6V2
15
U2010B
10
Figure 3.
Mode selection:
a) αmax (V9 = 0)
In this mode of operation, after V6 has reached the
threshold VT100, Pin 13 switches to –VS (Pin 11) and
Pin 6 to GND (Pin 10). A soft-start capacitor is then
shorted and the control angle is switched to αmax.
This position is maintained until the supply voltage
is switched off. The motor can be started again with
soft-start function when the power is switched on
again. As the overload condition switches Pin 13 to
Pin 11, it is possible to set in a smaller control angle,
αmax, by connecting a further resistance between
Pins 13 and 14.
4 (12)
TELEFUNKEN Semiconductors
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U2010B
*b) Auto start (Pin 9 open)
The circuit behaves as written under αmax (V9 = 0),
with the exception that Pin 6 is not connected to
GND. If the value of V6 decreases to 25% of the
threshold value (VT25), the circuit becomes active
again with soft-start.
c) Imax (V9 = V8)
When V6 has attained the overload threshold
maximum value i.e. V6 = VT100; Pin 13 is switched
to Pin 8 (VRef) through the resistance R (= 2 kW)
without soft-start capacitor discharging at Pin 7.
With this mode of operation, direct load current
control (Imax) is possible. A recommended circuit is
shown in figure 18.
Absolute Maximum Ratings
Reference point Pin 10, unless otherwise specified
Parameters
Sink current
vt s10 m
Pin 11
Sync. currents
vt s10 m
Pin 15
Phase control
Control voltage
Pins 4 and 8
Input current
Pin 4
Charging current
Pin 14
Soft-start
Input voltage
Pins 7 and 8
Pulse output
Input voltage
Pin 16
Reference voltage source
Output current
vt s10 m
Load current sensing
Input currents
Input voltages
Overload output
High-load output
vt s10 m
Storage temperature range
Junction temperature range
Ambient temperature range
Pin 8
Pins 1 and 2
Pins 5 and 6
Pin 13
Pin 12
Symbol
–IS
–is
"IsyncV
"isyncV
"–VI
II
– Iϕ max
–VI
+VI
–VI
I0
" Ii
Vi
IL
IL
Tstg
Tj
Tamb
Value
30
100
5
20
0 – V8
500
0.5
0 – V8
2
V11
10
30
1
0 – V8
1
30
* )100
40 to 125
* )125
10 to 100
Unit
mA
mA
V
mA
mA
V
V
mA
mA
V
mA
mA
C
C
C
Thermal Resistance
Junction ambient
Parameters
DIP16
SO16 on p.c.
SO16 on ceramic
Symbol
RthJA
Value
120
180
100
Unit
K/W
TELEFUNKEN Semiconductors
Rev. A1, 28-May-96
5 (12)