Power Line Signal Transmission Circuit With DC Isolation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing smart home devices have complex circuits due to separate power supply and signal lines, which complicates the circuit design.
Innovation Solution
A signal transmission circuit that utilizes a direct current power supply line for both power and signal transmission, incorporating a modulation circuit with a modulation chip and a demodulation circuit with a direct current isolation unit, allowing signal modulation and demodulation through the power supply line without an additional signal line.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate power supply line and signal line are provided in smart home devices, then power supply and signal transmission can be performed independently, but the circuit becomes complex
Solution Approach 1:
The patent combines the power supply line and signal line into a single integrated cable system. The power supply conductor serves dual purposes: delivering power and transmitting modulated signals. This merging eliminates the need for separate signal lines between smart home devices, directly resolving the contradiction by reducing circuit complexity while maintaining transmission reliability through modulation/demodulation circuits.
Solution Approach 2:
The power supply line is designed to perform multiple functions simultaneously: it provides electrical power to the device and serves as a communication channel for signal transmission. The modulation circuit modulates signals onto the power line, and the demodulation circuit extracts them at the receiving end, enabling the single power line to function as both power delivery and data communication medium.
2Loss of information
If a separate signal line is used for signal transmission, then signal quality can be maintained, but the connection between devices becomes complex
Solution Approach 1:
The patent merges the signal transmission function into the existing power supply line, eliminating the need for additional separate signal lines. The modulation circuit encodes signals onto the power line carrier, and the demodulation circuit at the receiving end extracts the original signals, maintaining signal quality while simplifying device connections to require only power line connections.
Solution Approach 2:
The modulation and demodulation circuits act as intermediaries that enable signal transmission through the power line. The modulation circuit converts baseband signals into modulated signals suitable for power line transmission, while the demodulation circuit converts received modulated signals back to baseband, facilitating clear signal transmission through the dual-purpose power line without requiring separate signal lines.
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 approach simplifies the circuit by eliminating the need for a separate signal line, making the connection between devices more straightforward and reducing complexity.
Implementation Method 1
the modulation chip is used to receive an input signal, generate a modulation signal according to the input signal, and output the modulation signal through the positive electrode of the power supply line
Implementation Method 2
the direct current isolation unit is used to isolate a direct current signal of the positive electrode of the power supply line, and output the modulation signal
Implementation Method 3
the demodulation unit is used to demodulate and output the modulation signal
Data Source
AI summary
A signal transmission circuit is connected to a positive electrode of a direct current power supply line, the signal transmission circuit includes a modulation circuit and/or a demodulation circuit, the modulation circuit includes a modulation chip, the modulation chip is used to receive an input signal, generate a modulation signal according to the input signal, and output the modulation signal through the positive electrode of the power supply line; the demodulation circuit includes a direct current isolation unit and a demodulation unit, the direct current isolation unit is connected to the demodulation unit and the positive electrode of the power supply line respectively, the direct current isolation unit is used to isolate a direct current signal of the positive electrode of the power supply line, and output the modulation signal; the demodulation unit is used to demodulate and output the modulation signal.