Power Filtering Circuit for Single-Wire Audio and DC Separation
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Solution Overview
Problem
Existing power and signal combining and separating devices fail to include both AC and DC power or signals on the same line, cannot separate different power and signal bands effectively, parasitically harvest energy, and require large or expensive components, limiting their practicality and manufacturing feasibility.
Innovation Solution
A system that combines and separates power and signals using a filtering extractor apparatus with a DC sensing switch circuit, a second-order low-pass filter, polarity-protection circuit, overcurrent-protection circuit, and heat sensor, allowing for the extraction of power from a combined signal and direct-current power line, enabling operation of devices with different power sources on the same wire without separate cables.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple wires are used to power both speakers and lights separately, then each device receives dedicated power without interference, but the system complexity and installation cost increase
Solution Approach 1:
The patent combines multiple power and signal lines into a single composite line that carries both DC power and AC audio signals simultaneously. This merging eliminates the need for separate wiring for speakers and lights, reducing installation complexity while maintaining reliable power delivery to each device through frequency-based separation at the receiving end.
Solution Approach 2:
The single wire system serves multiple functions: it transports DC power, carries AC audio signals, and provides both power and signal to different devices (speakers and lights) simultaneously. This multi-functional approach replaces traditional separate dedicated lines for each device, simplifying the overall system architecture.
2Device complexity
If AC and DC power are combined on the same line, then wiring is simplified, but separating the different power and signal bands becomes difficult
Solution Approach 1:
The patent segments the composite signal by frequency at the receiving end. DC power and AC audio signals are separated using filtering circuits that isolate different frequency bands, allowing each device to receive only its required power type from the combined line without interference from the other.
Solution Approach 2:
Filtering circuits act as intermediary components between the combined power/signal line and the individual devices. These filters mediate the separation process, directing DC power to power-hungry devices and AC signals to audio devices, making the separation process straightforward despite the combined input.
3Device complexity
If existing systems combine signals for both lights and speakers, then wiring is reduced, but light flickering occurs due to audio signal variations
Solution Approach 1:
The patent segments the signal paths by frequency, ensuring that DC power and AC audio signals remain separate even though they travel together on the same physical line. This segmentation prevents audio frequency variations from affecting the DC power supplied to lights, eliminating flickering while maintaining wiring simplicity.
Solution Approach 2:
The patent extracts DC power from the combined line specifically for lighting devices, isolating it from AC audio signals. This extraction ensures that lights receive clean, stable DC power without being subjected to audio signal variations, preventing flickering while still using a single composite line for both devices.
4Reliability
If protection circuits are added to prevent over-powering and damage, then device safety is improved, but the system becomes more complex
Solution Approach 1:
The patent implements self-service protection where the system automatically detects and responds to abnormal conditions without external intervention. Protection circuits monitor power and signal levels, and automatically disconnect or limit power delivery when thresholds are exceeded, providing robust device protection through built-in self-monitoring and self-protection mechanisms.
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
Enables the operation of multiple devices with different power sources on a single wire, preventing undesired interactions and allowing independent control, while extracting filtered power for intended uses, thus reducing the need for additional wiring and using existing wires to power normally incompatible devices.
Implementation Method 1
a second order low-pass filter functionally coupled to the DC sensing switch circuit
Implementation Method 2
an inductor or virtual inductor in combination with a capacitor and resistor
Implementation Method 3
an inductor or virtual inductor in combination with a capacitor and resistor in series with each other
Data Source
AI summary
An audio filtering and power extraction apparatus for filtering out audio signal and extracting power from a combined signal and direct-current power line, with an input configured to couple to a combined signal and direct-current power line, a filtering extractor system functionally coupled to the input, a DC sensing switch circuit, and a second order low-pass filter functionally coupled to the DC sensing switch circuit, the second order low-pass filter including, an inductor, a capacitor and resistor in series with each other, and an output functionally coupled to an output of the filtering extractor system and through which output extracted power is provided.