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參數(shù)資料
| 型號： | U2010B-XY |
| 廠商： | ATMEL CORP |
| 元件分類： | 運動控制電子 |
| 英文描述： | AC MOTOR CONTROLLER, 0.03 A, PDIP16 |
| 封裝： | LEAD FREE, DIP-16 |
| 文件頁數(shù)： | 15/18頁 |
| 文件大?。?/td> | 1228K |
| 代理商： | U2010B-XY |
6
4766C–INDCO–04/10
U2010B
3.7
Load-current Compensation
The circuit continuously measures the load current as a voltage drop at resistance R
6. The eval-
uation and use of both half waves results in a quick reaction to load-current change. Due to the
voltage at resistance R
6, 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 1-2 on page 2.
The efficient impedance of the set-point network generates a voltage at pin 4. A current, flowing
out of pin 5 through R
10, modulates this voltage. 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 avoids a decrease in revolution by increasing the load as well as an increase of revolution
by the increment of the mains supply voltage.
3.8
Load-current Limitation
The total output load current is available at pin 6. It results in a voltage drop across R
11. When
the potential of the load current reaches about 70% of the threshold value (V
T70), i.e., about 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 about 6.2 V (= V
T100), it switches the overload comparator.
The result is programmable at pin 9 (operation mode).
3.8.1
Mode Selection
a)
α
max (V9 = 0)
In this mode of operation, pin 13 switches to -V
S (pin 11) and pin 6 to GND
(pin 10) after V
6 has reached the threshold VT100. A soft-start capacitor is then
shorted and the control angle is switched to
α
max. This position is maintained
until the supply voltage is switched off. The motor can be started again with the
soft-start function when the power is switched on again. As the overload condition
switches pin 13 to pin 11, it is possible to use a smaller control angle,
α
max, by
connecting a further resistance between pins 13 and 14.
b)
Auto start (pin 9 – open), see Figure 7-8 on page 12
The circuit behaves as described above, with the exception that pin 6 is not
connected to GND. If the value of V6 decreases to 25% of the threshold
value (V
T25), the circuit becomes active again with soft start.
c)
I
When V
6 has reached the maximum overload threshold value (i.e., V6 = VT100),
pin 13 is switched to pin 8 (V
Ref) through the resistance R (= 2 kΩ) without the
soft-start capacitor discharging at pin 7. With this mode of operation, direct
load-current control (I
max) is possible.
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