Smart Speaker Power Mode Control for Safe Shutdown and Audio Load
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Solution Overview
Problem
Smart speaker systems lack effective power management features, leading to inefficiencies and potential shutdown issues due to varying input power conditions, which can affect user experience and device operation.
Innovation Solution
A power controller system that determines and communicates power modes to adjust current limits and shutdown thresholds, allowing for safe shutdown and dynamic audio performance optimization by coupling the processing system power bus with the audio system power bus, and an audio power supply controller that adjusts voltage based on upcoming audio energy requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the smart speaker operates without power mode detection and dynamic adjustment, then the device structure remains simple, but power efficiency deteriorates and shutdown issues occur under varying input power conditions
Solution Approach 1:
The power management system automatically detects input power conditions and adjusts operating parameters without user intervention. The controller monitors power source characteristics and dynamically configures audio processing and output stages to match available power, enabling the system to self-optimize efficiency across different power scenarios.
Solution Approach 2:
The system transitions from static power management to dynamic adaptation by continuously monitoring input power conditions and adjusting operational parameters in real-time. Audio processing gain, output power levels, and component activation states are dynamically modified based on detected power mode, allowing optimal performance across varying power availability.
2Reliability
If the smart speaker uses fixed shutdown voltage threshold, then the control logic remains simple, but reliability deteriorates under varying input power conditions
Solution Approach 1:
The shutdown voltage threshold is transformed from a fixed parameter to a dynamic one that varies based on input power conditions. The system detects power mode characteristics and selectively applies appropriate shutdown thresholds from a set of predefined values, ensuring reliable shutdown behavior adapted to each power source type and condition.
Solution Approach 2:
Different shutdown thresholds are applied to different operational contexts and power modes. Rather than using a single global threshold, the system selects specific threshold values tailored to each detected power condition, optimizing shutdown reliability for AC power, DC power, battery power, and other input sources independently.
3Use of energy by moving object
If the smart speaker operates at maximum audio power continuously, then audio performance remains high, but energy consumption increases and thermal management becomes difficult
Solution Approach 1:
The system applies partial audio processing and output activation based on detected power availability and content requirements. Rather than always operating at full capacity, the controller selectively engages audio processing stages and output power levels appropriate to the current power mode and program material, consuming only the energy necessary for satisfactory performance.
Solution Approach 2:
The power management system periodically re-evaluates input power conditions and adjusts operational parameters accordingly. This continuous monitoring and adjustment cycle allows the system to adapt to changing power availability, maintaining optimal audio performance during sufficient power conditions while reducing consumption when power becomes limited.
Data Source
AI summary
A smart speaker power controller may be configured to receive power conforming to one of a plurality of power modes from an input power source. The power controller may be further configured to communicate the power mode to at least one component of a processing system or at least one component of an audio system for operating the smart speaker according to the received power mode, including determining a current limit of a power converter; determining a shutdown voltage threshold and safely shutting down the smart speaker if the input voltage falls below the threshold, and/or modifying audio operation of the smart speaker in response to the power mode. The smart speaker can further include an audio power supply controller configured to monitor energy required to reproduce an audio signal and to servo a power supply voltage provided to an audio amplifier in response to this energy level.