Versatile audio power amplifier

Patent metadata

Field	Value
Publication number	US-8933753-B2
Application number	US-201414317367-A
Country	US
Kind code	B2
Filing date	Jun 27, 2014
Priority date	Mar 4, 2010
Publication date	Jan 13, 2015
Grant date	Jan 13, 2015

Abstract

An audio power amplifier includes a first and a second amplification unit, each including a switching voltage amplifier, an output filter, a current compensator, an inner current feedback loop feeding a measurement of current measured at the output inductor back to a summing input of the current compensator, a voltage compensator coupled to the summing input of the current compensator, and an outer voltage feedback loop. A controlled signal path provides the output of the voltage compensator of the first amplification unit to the current compensator of the second amplification unit. The first and second amplification units are operable with separate loads, in parallel driving a common load, or across a bridge-tied-load. A second pair of amplification units may be added and operated together with the first pair to drive a single speaker with a parallel pair of amplifiers on each side of a bridge-tied-load.

First claim

What is claimed is:

1. An audio power amplifier comprising:
a first, a second, a third, and a fourth amplification unit, each amplification unit comprising a switching voltage amplifier having a command signal input and an amplified signal output;
control electronics providing signal inputs to each of the amplification units and controlling the amplification units such that:
each amplification unit is operable to drive a separate load;
the first and second amplification unit…

Assignees

• Bose Corp

Inventors

• Nussbaum Michael
• Sheen Timothy
• Pearce Daniel Scott

Classifications

• H03F3/68 Primary

  Electricity · mapped topic

• H03F2200/03

  Electricity · mapped topic

• H03F2203/21

  Electricity · mapped topic

• H03F3/2178 Primary

  Electricity · mapped topic

• H03F3/217

  Electricity · mapped topic