Method and control circuit for reducing line-bound disturbances in a pulse-width modulated control of an electric motor
AssigneeRobert Bosch GmbH
InventorsPeter Buerk, Stefan Koch
Life of this patent
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Abstract
A method for reducing line-conducted interference in a pulse width modulated triggering system of an electric motor, a triggering pulse width modulation signal having, in one clock cycle, one or more signal edges between a first signal level and a second signal level, the pulse width modulation signal being generated in such a way that at least one of the signal edges has a first segment having a first edge slope and a second segment having a second edge slope, the absolute value of the first edge slope being less than the absolute value of the second edge slope.
Claims13
-12. (canceled)
A method for reducing a line-conducted interference in a pulse width modulated triggering system of an electric motor, comprising:
- providing a triggering pulse width modulation signal having, in one clock cycle, at least one signal edge between a first signal level and a second signal level;
- and
- causing the pulse width modulation signal to trigger the electric motor in such a way that the at least one signal edge has a first segment having a first edge slope and a second segment having a second edge slope, an absolute value of the first edge slope being less than an absolute value of the second edge slope.
A control circuit for triggering an electric motor via a pulse width modulation signal, comprising:
- a switching device via which the electric motor is connectable to a supply voltage, the switching device being controllable by way of the pulse width modulation signal;
- and
- a control module for generating the pulse width modulation signal for triggering the switching device, wherein:
- the pulse width modulation signal has, in one clock cycle, at least one signal edge between a first signal level and a second signal level,
- the control module generates the at least one signal edge in such a way that the at least one signal edge has a first segment having a first edge slope and a second segment having a second edge slope, and
- an absolute value of the first edge slope is less than an absolute value of the second edge slope.
Dependencies are inferred from the claim text.