Audio Amplifier Power Buffering for USB and PoE Limits
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Solution Overview
Problem
Audio amplifiers with limited power delivery capabilities, such as those using USB or Power over Ethernet (PoE) interfaces, are restricted by the maximum power output of their power sources, limiting their overall performance and sound pressure in applications where higher power is needed.
Innovation Solution
The use of DC to DC converters in audio amplifiers allows for the maximization of energy storage potential in devices like capacitors by varying voltage without affecting normal functionality, enabling sustained output levels beyond the power source limits through an electrical energy storage device and additional power conversion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a limited power source (USB/PoE) is used to power an audio amplifier, then the system achieves simplified power delivery and compact installation, but the maximum output power and sound pressure level are restricted by the power source limits
Solution Approach 1:
The patent applies preliminary action by storing energy in advance in a capacitor bank before the high-power output is needed. The capacitor bank charges from the limited power source during low-demand periods, accumulating sufficient energy to deliver brief high-power bursts when needed, thus resolving the contradiction between limited continuous power input and required peak power output
Solution Approach 2:
The system employs periodic action through alternating between charging mode (from limited power source) and discharging mode (to amplifier). The capacitor bank periodically accumulates energy and then releases it in controlled bursts, enabling the amplifier to exceed the continuous power limits of the USB or PoE source while maintaining simplified power delivery infrastructure
2Reliability
If the power source maximum delivery is 60W, then the system operates within safe power limits, but the loudspeaker output is limited to 60W or less due to system inefficiencies
Solution Approach 1:
Energy is preliminarily stored in the capacitor bank at safe charging rates from the 60W power source, then released at higher rates to the amplifier when needed. This preliminary energy accumulation allows the system to maintain reliability during charging while achieving higher productivity (sound pressure) during controlled discharging periods
Solution Approach 2:
The capacitor bank serves as an intermediary energy storage device between the limited 60W power source and the amplifier. It buffers the power source's limited delivery capability from the amplifier's higher power requirements, maintaining safety limits on the source side while enabling higher output on the load side through efficient energy transfer
3Device complexity
If combined power and data delivery interfaces (PoE/USB) are used, then cable count and installation complexity are reduced, but the maximum power available to drive loudspeakers is insufficient for many applications
Solution Approach 1:
The capacitor bank preliminarily stores energy from the combined power/data interface, accumulating sufficient energy to overcome the interface's power limitations. This allows the system to maintain the simplicity of single-cable PoE or USB connections while achieving adequate power for loudspeaker applications through energy accumulation and release cycles
Solution Approach 2:
The capacitor bank acts as an intermediary that decouples the power delivery capability from the data communication interface. It enables the system to use simple combined PoE/USB cables for both power and data while providing sufficient power to loudspeakers by buffering energy in the capacitor bank, thus resolving the contradiction between interface simplicity and power adequacy
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 audio amplifiers to deliver higher output power than their power sources allow, effectively increasing the sound pressure and efficiency in applications with limited power supplies, such as those using USB or PoE standards, by efficiently utilizing energy storage devices and maintaining stable voltage inputs.
Implementation Method 1
By employing DC to DC converters, audio amplifiers according to the present invention are capable of maximizing the energy storage potential of storage devices, such as capacitors, by allowing the storage devices to vary in voltage without having a negative impact on the normal functionality of the audio amplifier
Implementation Method 2
The use of DC to DC converters in audio amplifiers allows for the maximization of energy storage potential in devices like capacitors by varying voltage without affecting normal functionality
Data Source
AI summary
According to an example aspect of the present invention, there is provided an audio amplifier for use with a limited power source, the audio amplifier having: a power input terminal, a signal input terminal, a first DC to DC converter having an input connected to the power input terminal, an electrical energy storage device connected to an output of the first DC to DC converter, a second DC to DC converter having an input connected to the electrical energy storage device, an amplifier conductively connected to the output of the second DC to DC converter so as to be powered by the output of the second DC to DC converter, the amplifier also being conductively connected to the signal input terminal so as to receive a signal for amplification, and an output of the amplifier configured to be connected to a transducer such that the transducer may be driven by the amplifier.