Granted Patent B2

US 12,633,844 · App. 18/568,396 · Granted May 19, 2026

Inventors: Christian Weber (Bonn, DE); Dennis Burger (Friolzheim, DE); Helge Sprenger (Kornwestheim, DE); Thomas Zeltwanger (Asperg, DE)

Assignee: Robert Bosch GmbH

H02M7/5395H02M1/14H02M1/44

Abstract

Claims (35)

1 . A control device for an electrical power converter, the control device comprising:

a signal generating device configured to receive an input parameter, generate switching signals using the received input parameter, and provide the switching signals to switching elements of the electrical power converter, wherein the switching signals have a predefined modulation frequency; and

a control unit configured to adjust the predefined modulation frequency in the signal generating device,

wherein the control unit is further configured to

adjust a frequency as the predefined modulation frequency that varies in a predefined frequency range and with a predefined pattern around a fundamental frequency,

select the predefined modulation frequency from multiple equidistant frequencies within the predefined frequency range according to a random or pseudo-random sequence,

generate a sequence of modulation frequencies that approximates white noise by random or pseudo-random selection within the predefined frequency range, and

adjust the predefined frequency range and/or the predefined pattern based on an operating state of the electrical power converter, wherein

the operating state of the electrical power converter includes a speed of a motor, a torque, and/or a rotational frequency of the motor.

2 . The control device according to claim 1 , wherein the control unit is configured to adjust the fundamental frequency within a predefined range.

3 . The control device according to claim 2 , wherein the control unit is configured to adjust the predefined frequency range and/or the predefined pattern for varying the predefined modulation frequency as a function of the adjusted fundamental frequency.

4 . The control device according to claim 1 , wherein the predefined pattern comprises a plurality of predefined frequencies within the predefined frequency range, and wherein the plurality of predefined frequencies are adjusted randomly, pseudo-randomly or according to a predefined specification, wherein

the predefined specification comprises a statistical distribution selected from a uniform distribution or a Gaussian distribution.

5 . The control device according to claim 1 , wherein the control device is configured to adjust the predefined frequency range and/or the predefined pattern as a function of electromagnetic interference in the electrical power converter.

6 . The control device according to claim 1 , wherein the control device is configured to adjust the predefined frequency range and/or the predefined pattern as a function of a noise produced by the electrical power converter or a component controlled by the electrical power converter.

7 . The control device according to claim 1 , wherein the control unit is configured to adjust the predefined frequency range and/or the predefined pattern as a function of a voltage ripple of a DC link in the electrical power converter, wherein the voltage ripple is estimated using a computing model.

8 . The control device according to claim 1 , wherein the control device is configured to adjust the predefined frequency range and/or the predefined pattern as a function of an electrical current in a DC link of the electrical power converter, wherein the electrical current is a measured value, a calculated value, and/or a predefined target value.

9 . An electrical power converter, comprising:

a control device that includes

a signal generating device configured to receive an input parameter, generate switching signals using the received input parameter, and provide the switching signals to switching elements of the electrical power converter, wherein the switching signals have a predefined modulation frequency; and

a control unit configured to adjust the predefined modulation frequency in the signal generating device,

wherein the control unit is further configured to

adjust a frequency as the predefined modulation frequency that varies in a predefined frequency range and with a predefined pattern around a fundamental frequency;

wherein the switching elements are opened or closed using the switching signals generated by the signal generating device,

select the predefined modulation frequency from multiple equidistant frequencies within the predefined frequency range according to a random or pseudo-random sequence,

generate a sequence of modulation frequencies that approximates white noise by random or pseudo-random selection within the predefined frequency range, and

adjust the predefined frequency range and/or the predefined pattern based on an operating state of the electrical power converter, wherein

the operating state of the electrical power converter includes a speed of a motor, a torque, and/or a rotational frequency of the motor.

10 . A method for controlling an electrical power converter, the method comprising:

adjusting, via a control unit, a modulation frequency, wherein a set modulation frequency has a frequency varying at a predefined frequency range and with a predefined pattern around a predefined fundamental frequency; and

generating, via a signal generating device, switching signals for the electrical power converter using the set modulation frequency and a received input parameter,

selecting the modulation frequency from multiple equidistant frequencies within the predefined frequency range according to a random or pseudo-random sequence,

generating a sequence of modulation frequencies that approximates white noise by random or pseudo-random selection within the predefined frequency range, and

adjusting the predefined frequency range and/or the predefined pattern based on an operating state of the electrical power converter, wherein

the operating state of the electrical power converter includes a speed of a motor, a torque, and/or a rotational frequency of the motor.

Assignments (1)

Priority Claims (1)

Continuity (1)

References Cited (34)