U210B1

TELEFUNKEN Semiconductors

Rev. A1, 28-May-96

9 (12)

Applications

In contrast to simple speed controller, the circuits shown

in figures 15 and 16, react to the load dependent speed

drop in which the magnitude of the load current acts on

the speed compensation.

For this purpose, the load current is measured by shunt

the output of Pin 12.

Rated impedance of the output current at Pin 12 is repre-

impedance of the set point.

effects in the same direction on the control input as the set

point i.e., by the increase of load current follows an auto-

matic increase of manipulated set point, so that a

compensation of speed falls.

Compensation arrangement is influenced with resistance

whereas the higher effect is achieved by increasing the

can be increased up to the value where the drive system

(motor) starts to oscillate.

Dimensioning in the applications are with the drill

machine of 700 W power.

14

13

12

11

12

3

4

U210B

10

98

56

7

220 nF

M

18 k

W

470 k

W

1.5 W

1N4004

22

mF

25 V

230 V~

220 k

W

10 nF

22 k

W

15

mF

10 V

L

100 k

W

BC308B

4.7 k

W

10 k

W

min

max

220 k

W

2 k

W

50 m

W

100

W

N

BTA

12–800

Figure 15. Speed control with load current compensation