In a conventional amplifier and speaker setup for audio playback, a fixed voltage power supply, determined by the expected maximum peaks in input audio signal as well as a buffer value (headroom), is used to avoid distortion. A higher supply voltage is necessary to ensure sufficient headroom when the input audio has high peaks. A fixed headroom can cause high switching losses, reducing overall amplifier efficiency. This disclosure describes techniques to improve the efficiency of class-H amplifiers by dynamically changing the headroom based on distortion observed in audio output. A smart audio amplifier uses IV sense technology to measure the voltage and current from the speaker. The data are modeled to monitor the speaker’s distortion. The input voltage to the amplifier is dynamically adjusted to prevent distortion while keeping headroom value within bounds to improve amplifier efficiency.

Creative Commons License

Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 License.