Audio Amplifier Power Supply Burst Charging for Fast Wake-Up
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Solution Overview
Problem
Existing audio amplifiers face challenges in reducing power consumption and shortening wake-up time from standby mode, as the idle power of the power supply can be significant and capacitors take time to charge upon startup.
Innovation Solution
The audio amplifier system incorporates an isolated power supply that cycles between active and inactive states during standby mode, with a burst generator periodically activating the power supply to charge capacitors, and a duty cycle ramp generator to reduce peak current draw.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the power supply continuously charges capacitors during standby mode, then the wake-up time is short, but the power consumption is high
Solution Approach 1:
The power supply operates in periodic bursts during standby mode, charging capacitors for a first time period then entering an inactive state for a second time period. This periodic charging maintains sufficient capacitor charge for fast wake-up while significantly reducing average power consumption compared to continuous charging.
Solution Approach 2:
The power supply performs preliminary charging of capacitors during standby mode to prepare the system for rapid wake-up. By pre-charging capacitors in advance, the system ensures that when wake-up is needed, the capacitors are already charged and can immediately supply the high current required for startup, eliminating the need for lengthy charging delays.
2Reliability
If the power supply operates in active state continuously, then the capacitors are fully charged, but the power consumption increases
Solution Approach 1:
The power supply alternates between active and inactive states during standby mode, creating periodic charging cycles. This allows capacitors to be charged to sufficient levels for reliable operation while minimizing the duration of high-power active states, thereby reducing overall power consumption.
Solution Approach 2:
The power supply charges capacitors to a level that is sufficient for reliable wake-up operation but not necessarily to maximum capacity. This partial charging approach provides adequate reliability for the intended function while avoiding the excessive power consumption that would result from continuously maintaining maximum charge levels.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution significantly reduces power consumption and shortens the wake-up time from standby mode, achieving power savings of up to 50% and reducing wake time from seconds to milliseconds.
Implementation Method 1
an isolated power supply including one or more capacitors and a burst mode input
Data Source
AI summary
An improved audio amplifier system can both reduce power consumption by supporting a standby mode and shorten wake time when resuming from the standby mode. The audio amplifier system may reduce power by entering a sleep or standby state in response to a command and/or detecting that an audio input signal is not received. Further, the audio amplifier system may use a burst generator to periodically or intermittently activate the power supply during standby mode. By periodically or intermittently activating the power supply, one or more of the capacitors may be charged. By charging the capacitors during standby mode, the time to wake from standby mode may be significantly reduced. In some cases, the wake time may be reduced by several order of magnitudes (e.g., from seconds to milliseconds).