AN871 Datasheet, PDF (8/13 Pages) STMicroelectronics – In power electronics the choice of the switch to be used is always very important

AN871 APPLICATION NOTE
Figure 8. Example of gate drive interface circuits
+Vbat.
+Vbat.
M
M
+Vbat.
+Vbat.
+Vbat.
B
A
Note: (A): the triac is always fired by a negative gate current pulse (Quadrants II and III).
(B): the triac is fired by a negative gate current via D1 when A1 is grounded (QII) and a positive gate current via D2 and T1 when A1
is at +Vbat (QI).
Going further
Starting from this concept using only one triac per motor, we can imagine a "smart door" board designed
to control the functions set up in a car front door (see Figure 9). This solution provide the lowest cost per
channel.
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