Circuit arrangement for controlling motor voltage, especially of fan motor, has switches in form of transistors and control electronics for matching motor voltage to desired motor voltage that is function of desired value signal

摘要

The circuit arrangement (1) has a number of switches (T1-T3) and a number of power resistances (R1-R3), each with an associated switch for switching one of the power resistances in series with the motor (M). The switches are transistors and the circuit arrangement has control electronics (9) for matching a motor voltage (UMot) to a desired motor voltage that is a function of a desired value signal (SSoll).