Class-D amplifier and operating method

US11108365B2 · kind B2 · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Fabian Hoffmeister · Sonneberg, DE
• Gregor Sauer · Rockenberg, DE
• Josef Plager · Bogen, DE
• Markus Mandl · Agendorf, DE
• Thomas Stein · Oberkochen, DE
• Patrick Engl · Rattiszell, DE

Key dates

• Filing date: Apr 11, 2018
• Grant date: Aug 31, 2021
• Expiry date: May 25, 2038

Classification

• Technology area (CPC H): Electricity
• CPC primary: H03F2200/03
• WIPO field: Basic communication processes
• WIPO sector: Electrical engineering

Abstract

The invention relates to a method for operating a class-D amplifier (2) for an audio signal (4), which class-D amplifier contains an output stage (10) and a signal-processing unit (12) in a signal path (6), wherein a voltage (U) of at least two magnitudes (U1, U2) is provided for the output stage (10), a voltage requirement (B) of the output stage (10) for the audio signal (4) is predictively determined from the audio signal (4) at a measurement location (14) before the signal-processing unit (12), a magnitude (U1, U2) that is minimally sufficient for the voltage requirement (B) is selected on the basis of the voltage requirement (B) and said magnitude is applied to the output stage (10) before the amplification. A class-D amplifier (2) for an audio signal (4), having a signal path (6), which has an output stage (10) and a signal-processing unit (12), contains a voltage source (16) for the output stage (10) having a voltage (U) of at least two magnitudes (U1, U2), a measurement location (14) before the signal-processing unit (12), and a control and evaluation unit (18) for predictively determining a voltage requirement (B) for the output stage (10) for the proper amplification of t…