Sliding PSU Boost Circuit for Low-Loss Bluetooth Audio Power
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Solution Overview
Problem
Traditional DC booster circuits in short-range wireless audio devices, such as Bluetooth speakers, suffer from low power efficiency, leading to increased power consumption and reduced battery life, with power efficiency ranging from 20% to 25% reduction, resulting in shorter audio playback times.
Innovation Solution
A dynamic boost audio system featuring a boost circuit with a dynamically sliding power supply unit (PSU) that adjusts power levels in real-time based on audio signal levels, eliminating the need for a direct-current booster at low power levels and enabling instant voltage boosts when needed, thereby reducing power waste and heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a traditional DC booster circuit is used to boost power for achieving desired output ratings, then the output power is sufficient, but power efficiency is reduced by 20% to 25%
Solution Approach 1:
The patent implements a dynamically sliding power supply unit that automatically adjusts the power supply voltage based on real-time audio signal levels. The PSU slides between multiple voltage levels (e.g., 3.7V, 6V, 8.5V, 12V) to match the actual power requirements, avoiding the continuous high-power operation of traditional DC boosters. This dynamic adjustment resolves the contradiction by providing sufficient output power when needed while minimizing energy loss during low-demand periods.
Solution Approach 2:
The system changes the power supply voltage parameter dynamically based on audio signal characteristics. An AC/DC averaging circuit monitors the music signal and triggers voltage transitions when thresholds are exceeded. This parameter change approach allows the system to maintain adequate output power for audio reproduction while significantly reducing energy loss by operating at lower voltages during idle and low-volume conditions.
2Power
If a DC-DC booster circuit is used to boost amplifier voltage, then the desired output power is achieved, but heat dissipation increases
Solution Approach 1:
The dynamically sliding PSU adjusts voltage levels in real-time based on audio demands, avoiding continuous operation of the DC-DC booster at high power levels. By sliding to appropriate voltage levels (e.g., using 3.7V when sufficient, only boosting to 6V, 8.5V, or 12V when audio levels exceed thresholds), the system achieves necessary amplifier voltage while minimizing heat generation from unnecessary boosting operations.
Solution Approach 2:
The system uses periodic monitoring of audio signal levels through the AC/DC averaging circuit, triggering voltage boosts only when and if needed. This periodic assessment and conditional activation approach ensures that the DC-DC booster operates intermittently rather than continuously, reducing cumulative heat dissipation while maintaining adequate amplifier voltage when audio levels require it.
3Volume of moving object
If a single-cell battery is used to power the DC booster circuit, then the device remains compact, but battery sustainable ability is reduced due to high power consumption
Solution Approach 1:
The dynamically sliding PSU enables the compact single-cell battery to sustain operation for longer periods by adjusting power output dynamically. The PSU slides to lower voltage levels during idle and low-volume conditions, dramatically reducing power consumption from the battery. This allows the same compact battery to provide extended playback time, resolving the contradiction between small battery size and limited battery life.
Solution Approach 2:
The system changes the power draw parameter from the battery by adjusting PSU output voltage based on actual audio demands. During low-volume or idle periods, the PSU operates at lower voltages (e.g., direct 3.7V output), significantly reducing battery current draw. This parameter adjustment extends battery sustainable ability while maintaining the compact single-cell battery design, as the battery is not continuously drained at high rates.
4Power
If a traditional DC booster circuit operates continuously, then power output is maintained, but idle power consumption is high
Solution Approach 1:
The dynamically sliding PSU transitions from continuous operation to conditional operation, sliding to appropriate voltage levels based on real-time audio signal monitoring. When audio levels are below thresholds, the PSU remains at lower power states, dramatically reducing idle power consumption. When audio levels exceed thresholds, the PSU dynamically boosts to required levels, maintaining adequate power output only when needed rather than operating continuously.
Solution Approach 2:
The AC/DC averaging circuit periodically monitors audio signal levels and triggers PSU voltage adjustments only when necessary. This periodic monitoring and conditional activation approach allows the system to maintain power output capability while minimizing idle power consumption, as the booster operates in a standby or low-power state during periods when audio levels do not require boosting.
Data Source
AI summary
A dynamic boost audio system includes a booster circuit having a dynamically sliding power supply unit (PSU) capable of outputting power among a plurality of different power levels. The booster circuit is configured to identify a real-time audio level of an audio signal, and automatically adjust the power to the power level such that the audio signal is output in response to the real-time audio level.