Circuit arrangement

Abstract

The invention specifies a circuit arrangement (1, 20) for controlling a brushless electric motor (37) with a control chip (2), particularly a microcontroller, which has a number of PWM contacts (8), which can be used to output a PWM signal, and a number of commutation contacts (5,5′, 6,6′, 7,7′), which can be used to output a commutation signal. In this case, provision is made for at least one commutation contact (5,5′, 6,6′, 7,7′) to be alternately controllable as an input and an output, for the at least one commutation contact (5,5′, 6,6′, 7,7′) to have its output electrically connected to a PWM contact (8), and for the commutation contact (5,5′, 6,6′, 7,7′) connected in this manner to be able to be contacted for the purpose of tapping off a control signal. Such a circuit arrangement (1,20) increases the control options for a given control chip (2). The number of PWM sources required is reduced.

Dependencies are inferred from the claim text.