Contactless Power Control Device Phase Difference Management
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Solution Overview
Problem
In contactless power transmission systems with multiple coils on the primary side, phase differences between drive signals can lead to malfunctions in communication or power transmission between the primary and secondary sides, affecting efficiency and reliability.
Innovation Solution
A control device sets a predetermined phase difference between drive signals for primary and secondary coils during normal and intermittent power transmission, reducing adverse effects such as communication errors and power transmission inefficiencies by varying the phase difference between 0 degrees, 90 degrees, and 180 degrees based on operational modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple coils are arranged on the primary side to transmit power to multiple apparatuses independently, then power transmission capability is improved, but phase difference control becomes complex and communication errors may occur
Solution Approach 1:
The patent applies dynamics by making the phase difference between drive signals adjustable rather than fixed. The control device dynamically changes the phase difference between first and second drive signals based on operational requirements - using 90 degrees during intermittent power transmission and 0 degrees during normal power transmission. This dynamic adjustment resolves the contradiction by enabling flexible control that adapts to different operating modes, maintaining power transmission capability while preventing communication errors through appropriate phase configuration.
Solution Approach 2:
The patent implements parameter changes by varying the phase difference parameter between drive signals according to the power transmission mode. Specifically, the phase difference is set to 90 degrees during intermittent power transmission to prevent communication errors, and changed to 0 degrees during normal power transmission to optimize power transfer. This parameter adjustment strategy allows the system to maintain high productivity while managing control complexity through standardized phase configurations.
2Reliability
If phase difference between drive signals is set to specific values (90 or 180 degrees) for intermittent power transmission, then communication errors are reduced, but power transmission efficiency decreases
Solution Approach 1:
The patent applies periodic action by using different phase difference configurations for different operational periods. During intermittent power transmission periods (such as landing detection or removal detection), the phase difference is set to 90 degrees to ensure reliable communication and prevent errors. During normal power transmission periods, the phase difference is switched to 0 degrees to maximize power transmission efficiency. This periodic switching between phase configurations resolves the contradiction by matching the phase setting to the operational requirements of each period.
Solution Approach 2:
The patent uses dynamics to switch between different phase difference values based on the operational mode. The control device dynamically adjusts the phase difference between drive signals - using 90 degrees when intermittent power transmission is performed to maintain communication reliability, and switching to 0 degrees when normal power transmission is performed to optimize energy efficiency. This dynamic adaptation allows the system to achieve both high reliability during detection phases and high efficiency during power transfer phases.
3Adaptability or versatility
If phase difference between drive signals becomes random during independent control of multiple apparatuses, then system adaptability is improved, but malfunctions in communication or power transmission occur
Solution Approach 1:
The patent implements parameter changes by establishing specific phase difference values for different power transmission modes rather than allowing random phase variations. During intermittent power transmission, the phase difference is set to 90 degrees, and during normal power transmission, it is set to 0 degrees. These standardized parameter configurations maintain system adaptability for independent control of multiple apparatuses while preventing malfunctions by eliminating random phase differences that could cause communication or power transmission errors.
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 ensures stable and efficient communication and power transmission by minimizing interference and fluctuations, thereby enhancing the reliability of contactless power transfer between multiple apparatuses.
Implementation Method 1
contactless power transmission (wireless power transmission), using electromagnetic induction
Data Source
AI summary
A control device controls a first power transmission driver that applies a first drive signal to a first primary coil and a second power transmission driver that applies a second drive signal to a second primary coil. When intermittent power transmission is performed by applying the second drive signal in a period in which normal power transmission is performed by applying the first drive signal, a controller of the control device sets the phase difference between the first drive signal and the second drive signal to a predetermined phase difference.