Boosted Differential Class H Amplifier

摘要

A differential audio amplifier system and a related system to generate an output signal free or with only very limited clipping are disclosed. It provides a solution to solve the problem of limited electrical speaker amplifier output power available (e.g. inside battery driver applications). A differential speaker amplifier has positive and negative supply rails. In a first embodiment of the disclosure the negative supply rail is connected to the output of an inverting buck-boost converter and the positive supply rail is directly connected to VSS voltage. In a second embodiment of the disclosure the positive supply rail is connected to the output of a buck-boost converter and the negative supply rail is directly connected to a positive battery voltage.

主权项

1. A method to achieve a differential audio amplifier generating an output signal free or with only very limited clipping comprising the steps of:
providing a supply voltage, an inverting DC/DC converter, and a differential speaker amplifier of a portable device, wherein the amplifier has dynamic positive and negative supply rails; connecting the positive supply rail directly to VSS supply voltage; supplying the negative supply rail by an output of the inverting DC/DC converter; and shifting the arithmetic average of the input signals to the arithmetic average of the voltage levels of the positive and negative supply rails.