AN871 Datasheet, PDF (9/13 Pages) STMicroelectronics – In power electronics the choice of the switch to be used is always very important

AN871 APPLICATION NOTE
Figure 9. "Smart door control" concept based on small triacs to drive each actuator of the various
functions of the front door
M
MIRROR FOLDEN
M
MIRROR
M
MIRROR
M
DOOR LOCK
M
SUPER
DOOR LOCK
Other applications
Small motor breaking. Another example of application of SCR or triac in a DC motor circuit is the dy-
namic breaking. For instance, wipers control requires an accurate positioning when the motor is switched
off.
An efficient solution consists in short circuiting the motor, with the SCR T, as soon the circuit is turned off
(see Figure 10). A MOSFET is also able to break but would cause a short circuit with its body diode in
case of reverse polarity.
Figure 10. Thyristor used in motor breaking
VBAT.
DRIVER
T
M
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