Contactless Power Feeding Phase Control for Signal Delay Compensation
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Solution Overview
Problem
Existing contactless power feeding facilities face limitations in synchronizing the phases of alternating currents due to varying transmission times of synchronization signals from the master unit to power supply devices, which affects the accuracy of power delivery.
Innovation Solution
A contactless power feeding facility with a synchronization system that includes a master unit and power supply devices, where each power supply device calculates an adjusted phase by delaying and advancing the synchronization signal based on the transmission time, ensuring synchronized phase delivery across all power feeding lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a master unit transmits synchronization signals to multiple power supply devices, then phase synchronization of alternating currents is achieved, but transmission time differences cause reduced synchronization accuracy
Solution Approach 1:
The patent applies preliminary action by pre-calculating and setting the transmission time from the master unit to each power supply device, then compensating for these time differences in advance. Each power supply device stores its specific transmission time value and uses it to adjust the phase of received synchronization signals before generating alternating currents, thereby eliminating synchronization errors caused by transmission time variations.
Solution Approach 2:
The patent changes the phase parameter of synchronization signals based on transmission time differences. Each power supply device adjusts the phase of the synchronization signal by an amount corresponding to its specific transmission time, transforming a uniform synchronization approach into a customized phase-adjusted approach that compensates for individual transmission path variations.
2Measurement precision
If synchronization time is not compensated for transmission delays, then system complexity is reduced, but phase synchronization accuracy deteriorates
Solution Approach 1:
The patent implements self-service by enabling each power supply device to independently compensate for its own transmission time delay. Each device stores its specific transmission time value and autonomously adjusts the phase of received synchronization signals without requiring external intervention or complex centralized control, thereby improving synchronization accuracy while minimizing system complexity.
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 allows for precise synchronization of alternating currents, increasing the accuracy of phase synchronization even when transmission times differ among power supply devices, enhancing the overall power delivery process.
Implementation Method 1
a power supply circuit configured to supply an alternating current to the power feeding line connected to the power supply device
Data Source
AI summary
A synchronization system for synchronizing phases of alternating currents supplied from a plurality of power supply devices includes a master unit that outputs a synchronization signal having a predetermined period. Each power supply device includes: a power supply circuit that supplies an alternating current to a power feeding line; and a power supply control unit that receives the synchronization signal and controls the power supply circuit. The power supply control unit calculates an adjusted phase by delaying a phase of the received synchronization signal by an amount corresponding to a prescribed delay time and advancing the delayed phase by an amount corresponding to a time required to transmit the synchronization signal from the master unit to the power supply control unit, and controls the power supply circuit in such as manner as to synchronize the phase of the alternating current with the adjusted phase.