Contactless Power Transmitter Frequency Control for Broadcast Interference
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Solution Overview
Problem
Contactless power transmitting devices often interfere with broadcast receivers due to noise generated, and setting transmission frequencies to avoid interference is challenging, especially when the installation position of the device is unknown.
Innovation Solution
A contactless power transmitting device that adjusts its transmission frequency based on received broadcast wave frequency information, ensuring the transmission frequency differs from integer multiples of the broadcast wave frequency, using a controller that can obtain frequency information through a receiver and communication unit, and optionally using positional information to optimize the frequency setting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the transmission frequency is set to avoid broadcast wave frequencies, then interference with broadcast receivers is reduced, but the device complexity increases due to frequency searching and adjustment mechanisms
Solution Approach 1:
The power transmission controller performs frequency searching operations before power transmission to identify broadcast wave frequencies in the installation environment. By detecting broadcast frequencies in advance and storing them in memory, the system prepares avoidance frequencies beforehand, preventing interference without requiring complex real-time adjustment mechanisms during power transmission.
Solution Approach 2:
The system uses its own receiver to detect broadcast frequencies and automatically determines suitable transmission frequencies that avoid interference. The power transmission controller autonomously selects frequencies from candidate frequencies based on detected broadcast frequencies, eliminating the need for external configuration or complex manual adjustment mechanisms.
2Device complexity
If the transmission frequency is fixed at manufacturing, then device complexity is reduced, but the ability to avoid interference at unknown installation positions is lost
Solution Approach 1:
The transmission frequency is made dynamically adjustable rather than fixed. The power transmission controller can change the transmission frequency based on detected broadcast frequencies in the installation environment. This dynamic capability allows the system to adapt to different installation positions and environments while maintaining relatively simple device structure through automated frequency selection.
Solution Approach 2:
The system changes the transmission frequency parameter based on environmental conditions (detected broadcast frequencies). By storing multiple candidate frequencies and selecting appropriate ones based on detected broadcast frequencies, the system achieves adaptability to different installation positions without requiring complex configuration mechanisms.
3Measurement precision
If frequency searching operation is performed continuously, then the ability to detect broadcast frequencies is improved, but energy consumption increases
Solution Approach 1:
The receiver performs frequency searching operations periodically or intermittently rather than continuously. The power transmission controller executes frequency searching at appropriate intervals (e.g., before power transmission or when conditions change), achieving sufficient detection accuracy while significantly reducing energy consumption compared to continuous operation.
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 solution effectively minimizes the influence of the contactless power transmitting device on broadcast receivers by setting transmission frequencies that avoid harmonic noise interference, regardless of the device's installation position.
Implementation Method 1
a transmitting coil 223 configured to contactlessly transmit electric power to a power receiving unit 110
Implementation Method 2
a receiver 264 configured to receive a broadcast wave
Data Source
AI summary
A contactless power transmitting device that contactlessly transmits electric power to a power receiving device includes a transmitting unit and a power transmission controller. The transmitting unit transmits electric power at a variable transmission frequency. The power transmission controller sets the transmission frequency, based on frequency information concerning a frequency of a broadcast wave that can be received at a position of the contactless power transmitting device. The power transmission controller sets the transmission frequency so that one of the transmission frequency and the frequency of the broadcast wave differs from an integer multiple of the other thereof.