Power Transmission System Modulating AC Signals for Synchronization
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Solution Overview
Problem
Current power transmission systems face challenges in efficiently transmitting both direct-current and alternating-current power over wired transmission lines, requiring complex distribution facilities and incurring additional costs due to the need for separate communication facilities and increased communication overhead for synchronization and state detection of the transmission line.
Innovation Solution
A power transmission system that includes a code modulator and code demodulator to modulate and demodulate electric power using alternating-current code sequences, allowing for synchronized power transmission with reduced communication overhead by using a controller to manage code sequences and detect transmission line states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate communication facilities are used for synchronization and state detection, then communication reliability is improved, but device complexity and cost increase
Solution Approach 1:
The patent combines communication functions with power transmission by modulating communication signals onto the power transmission line itself. The communication circuit modulates a communication signal onto the power signal, and the demodulation circuit extracts it at the receiving end, eliminating the need for separate communication facilities while maintaining reliability.
Solution Approach 2:
The power transmission line is made to serve dual purposes: transmitting both power and communication signals. The modulation and demodulation circuits enable the same physical medium (the transmission line) to carry both energy and information, reducing overall system complexity.
2Reliability
If synchronization control signals are transmitted separately, then power transmission synchronization is improved, but communication overhead increases
Solution Approach 1:
Synchronization control signals are merged with the power transmission signal through modulation. The communication circuit modulates control signals onto the power signal waveform, allowing synchronization information to be transmitted along with power without requiring separate communication channels, thereby reducing communication overhead.
3Loss of energy
If direct-current and alternating-current power are transmitted separately, then power transmission efficiency is improved, but device complexity increases
Solution Approach 1:
The power transmission system is designed to handle both direct-current and alternating-current power through a universal modulated transmission approach. By modulating power signals regardless of their original type and transmitting them through the same infrastructure, the system maintains transmission efficiency while reducing the need for separate distribution facilities for different power types.
Data Source
AI summary
A power receiving apparatus includes: a communication circuit that receives a control signal from a power transmitting apparatus through a wired transmission line; a control circuit that determines a propagation time in which the control signal is propagated from the power transmitting apparatus to the power receiving apparatus through the wired transmission line; and a demodulation circuit that receives modulated power from the power transmitting apparatus through a wired transmission line, and demodulates, based on the determined propagation time, the modulated power in synchronization with a phase of the modulated power.