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US 2022/0069783 A1Published application
Class d amplifier with current mode control
AssigneeRGB Systems, Inc.
InventorEric Mendenhall
Life of this patent
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Abstract
An audio amplifier that implements current mode control without the use of an explicit or separate current mode sensor is disclosed. The audio amplifier may include a pair of feedback loops that provide current from a node located before an inductor of an output filter and current from a node located after the inductor of the output filter to an integrator circuit. The integrator circuit may be formed from existing circuitry of the audio amplifier controller. Thus, current mode control can be implemented without a separate current mode sensor.
Claims21
An audio amplifier comprising:
- a power output stage configured to output an audio output signal, the audio output signal generated by amplifying an audio input signal;
- an output filter connected to the power output stage and configured to filter the audio output signal to generate a filtered output signal, wherein the output filter comprises an inductor;
- a first feedback loop between a first node and a summing node, the first node between the power output stage and the inductor, wherein the first feedback loop is configured to provide a first current to an integrator at the summing node;
- and
- a second feedback loop between a second node and the summing node, the second node between the inductor and an output of the audio amplifier, wherein the second feedback loop is configured to provide a second current to the integrator at the summing node, and wherein an integrator output of the integrator provides current mode control of the audio amplifier.
2 more elements
An audio system comprising:
- a speaker configured to output audio;
- and
- an audio amplifier in communication with the speaker and configured to provide an audio output signal to the speaker for output, wherein the audio amplifier comprises:
- a power output stage configured to output the audio output signal to the speaker to produce audio output, the audio output signal generated by amplifying an audio input signal;
- an output filter connected to the power output stage and configured to filter the audio output signal to generate a filtered output signal, wherein the output filter comprises an inductor;
- a first feedback loop between a first node and a summing node, the first node between the power output stage and the inductor, wherein the first feedback loop is configured to provide a first current to an integrator at the summing node;
- and
- a second feedback loop between a second node and the summing node, the second node between the inductor and an output of the audio amplifier, wherein the second feedback loop is configured to provide a second current to the integrator at the summing node, and wherein an integrator output of the integrator provides current mode control of the audio amplifier.
5 more elements
Dependencies are inferred from the claim text.