Non-contact EV Charging Frequency Adjustment for Radio Interference
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Solution Overview
Problem
Existing non-contact power supply systems for electric vehicles require manual adjustment of charging frequency by occupants to avoid radio noise interference, leading to user annoyance and inefficiency.
Innovation Solution
A non-contact power supply system with a frequency adjusting unit that automatically changes the charging frequency to avoid interference with radio frequencies, allowing for stable and efficient power supply without user intervention, using a power receiving unit, power supply control unit, radio state determining unit, and storage of interference data for efficient operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If manual frequency adjustment is implemented to avoid radio noise interference, then radio noise interference is avoided, but user convenience deteriorates due to required manual operations
Solution Approach 1:
The system automatically detects radio frequency usage and adjusts the charging frequency without requiring user intervention. The control unit monitors radio operations and autonomously modifies the charging frequency to avoid interference, making the system self-adjusting and eliminating manual operations from users.
Solution Approach 2:
The system implements a feedback mechanism where the control unit continuously monitors the operational state of the radio and adjusts the charging frequency based on this information. When radio usage is detected, the system receives feedback about the interference condition and automatically modifies the charging frequency to resolve the interference issue.
2Object-affected harmful factors
If charging frequency is changed to avoid radio interference, then radio interference is eliminated, but system complexity increases due to additional control mechanisms
Solution Approach 1:
The control unit performs multiple functions: it manages the charging process, monitors radio operational state, detects interference conditions, and adjusts charging frequency. By consolidating these diverse functions into a single control unit, the system avoids adding separate complex subsystems while still achieving automatic interference avoidance.
Solution Approach 2:
The system combines the radio state determining function with the frequency adjusting function in an integrated control mechanism. Rather than having separate systems for radio monitoring and frequency control, these functions are merged into a unified control process that efficiently manages both charging and radio interference avoidance.
3Ease of operation
If automatic frequency adjustment is implemented, then user convenience is improved, but computational load increases due to continuous monitoring and adjustment
Solution Approach 1:
The control unit monitors radio operational state at periodic intervals rather than continuously, and adjusts frequency only when interference conditions are detected. This event-driven approach reduces computational load by performing monitoring and adjustment operations only when necessary, rather than maintaining constant active processing.
Solution Approach 2:
The system extracts and monitors only the critical parameter (radio operational state) needed for interference detection, rather than continuously analyzing all possible electromagnetic signals. By focusing computational resources on detecting radio usage states rather than comprehensive signal analysis, the computational load is significantly reduced while still achieving effective interference avoidance.
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
Reduces user annoyance by automating frequency adjustments, enables radio listening during charging, and enhances charging efficiency by minimizing frequency fluctuations and computational load, while improving marketability through enhanced user comfort and reduced setup time.
Implementation Method 1
a power receiving unit configured to receive electrical power for charging the electrical storage device, in a non-contact manner from an external power supplying device
Implementation Method 2
the frequency adjusting unit changes the charging frequency to a frequency that is capable of avoiding the interference
Data Source
AI summary
In a non-contact power supplied electric vehicle or a non-contact power supplying method, when a request for starting non-contact supply of power is made, if it is determined that interference occurs between a charging frequency or a higher harmonic component thereof and a radio frequency, the charging frequency is changed to a frequency that is capable of avoiding the interference. Non-contact supply of power is allowed to be started under a condition in which the charging frequency has been changed to a frequency that is capable of avoiding the interference.