Fan control circuit for vehicle cooling fan, has additional power switch for turning on electrical drives in fan device that are supplied by energy storage device or on-board electrical system

摘要

The control circuit has an additional power switch (21) for turning on electrical drives (12,14) in the fan device that are supplied by an energy storage device (1) or an on-board electrical system (2) and that also contain power switches (7,11). A continuous increase in the revolution rate of the electric drives takes place via the controllable power semiconductors, which are controlled by an in-phase pulse width modulation signal (27).