Pulse-Regulated Audio Amplifier Output for Low-Voltage Wearables
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Solution Overview
Problem
Wearable audio devices face challenges in achieving high-fidelity audio reproduction while operating efficiently with limited power resources, as they require small batteries that constrain power capacity.
Innovation Solution
A low voltage system is implemented with a capacitor between the amplifier's output node and ground, a monitoring circuit to regulate voltage, and a control system to generate pulses for the amplifier, allowing for efficient charging and discharging of the capacitor to maintain a desired low voltage level, suitable for use in audio amplifiers like Class D amplifiers in wearable devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a wearable audio device uses a small battery to maintain portability, then the device size is reduced, but the power capacity is limited
Solution Approach 1:
The amplifier operates in periodic pulse intervals rather than continuously, with the capacitor charging during idle periods and discharging during audio output periods. This allows the system to deliver high power when needed while consuming minimal power during non-audio periods, effectively extending battery life without requiring a larger battery capacity
Solution Approach 2:
The invention extracts the energy storage function from the battery system by introducing a separate capacitor that handles high-power audio output demands. The battery maintains a stable low voltage, while the capacitor provides the necessary power bursts, separating the functions of energy storage and power delivery
2Reliability
If the amplifier operates continuously to provide high-fidelity audio, then audio quality is maintained, but power consumption increases
Solution Approach 1:
The amplifier is driven by periodic pulses rather than continuous operation. The capacitor charges during intervals when no audio is played and discharges during audio playback, maintaining high-fidelity audio quality during active periods while minimizing power consumption during idle periods
Solution Approach 2:
The system dynamically switches between charging and discharging modes based on audio input presence. When audio is detected, the capacitor discharges to power the amplifier; when no audio is present, the capacitor charges, creating a dynamic power management system that adapts to usage conditions
3Use of energy by moving object
If a capacitor is added to regulate voltage in the amplifier circuit, then power efficiency is improved, but device complexity increases
Solution Approach 1:
The capacitor acts as an intermediary energy storage element between the battery and the amplifier load. It absorbs voltage regulation functions, allowing the amplifier to operate efficiently at optimal voltage levels while the monitoring circuit manages charging and discharging based on voltage thresholds
Solution Approach 2:
A monitoring circuit continuously monitors the capacitor voltage and provides feedback control for charging and discharging operations. When voltage reaches a threshold, the monitoring circuit triggers discharge; when voltage drops, it triggers charging, creating a closed-loop voltage regulation system
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 enables high-fidelity audio reproduction in wearable devices while optimizing power efficiency, reducing power consumption and extending battery life by regulating voltage levels effectively.
Implementation Method 1
a capacitor between an output node of an amplifier and ground
Implementation Method 2
a monitoring circuit configured to monitor a voltage at the capacitor against a desired low voltage value
Data Source
AI summary
In some embodiments, a low voltage system can include a capacitor between an output node of an amplifier and ground, with the output node connectable to a load, and the amplifier configured to operate with a series of pulses. The low voltage system can further include a monitoring circuit configured to monitor a voltage at the capacitor against a desired low voltage value, and a control system configured to generate the series of pulses for the amplifier, and to control charging and discharging of the capacitor based on an output of the monitoring circuit to regulate the voltage at the output node at approximately the desired low voltage value.