Adaptive rail voltage regulation on power supplies
AssigneeBang & Olufsen A/S
InventorJens Hjort Drejer
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Abstract
The system comprises a Digital Signal Processing module, a Power Supply Unit and an audio amplifier. In the Digital Signal Processing module, the level of the digital audio signal is detected for adjusting the rail voltage in the amplifier. The digital audio signal is delayed by the Digital Signal Processing module prior to transforming and feeding it into the audio amplifier for amplification in order to stabilize the rail voltage after adjustment of the rail voltage to an increased level. Further in order to decrease the power consumption, especially in battery driven amplifiers, an adjustment of the rail voltage to a reduced level is delayed by a second predetermined time length (S_Hold) of 1 to 5 seconds as this reduces the number of adjustments of the rail voltage.
Claims10
A method for regulating an adaptive rail-voltage in an audio amplifier, the method comprising,
- receiving a digital audio signal by a Digital Signal Processing module, converting the digital audio signal to an analog audio signal and feeding the analog audio signal into the audio amplifier;
- in the Digital Signal Processing module detecting the level of the digital audio signal and based on the digital audio signal level analyzing the rail-voltage requirement for the audio amplifier to amplify the analog audio signal without voltage clipping;
- in accordance with the rail voltage requirements sending a control signal from the Digital Signal Processing module to a Power Supply Unit, the control signal causing adjustment of the rail voltage in the audio amplifier by the Power Supply Unit;
- delaying the digital audio signal by the Digital Signal Processing module prior to transforming and feeding it into the audio amplifier for amplification, wherein the delay is of a first predetermined time length (S_delay) sufficiently long for the Power Supply Unit to stabilize the rail voltage after adjustment of the rail voltage to an increased level;
- delaying an adjustment of the of the rail voltage to a reduced level, as a consequence of the detection of a reduced level of the digital audio signal, by a second predetermined time length (S_Hold) of 1 to 5 seconds in order to reduce the number of adjustments of the rail voltage.
Dependencies are inferred from the claim text.