Wireless Power Feeding Using Sub-Carrier Frequency Detection
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Solution Overview
Problem
Contactless power feeding systems face challenges in specifying and managing power receivers, controlling power supply, and optimizing power transmission efficiency due to their contactless nature, leading to increased complexity and cost.
Innovation Solution
A wireless power feeding method where the power receiver transmits position and resonant frequency detection signals to the power feeding device, allowing it to identify and manage the receiver, and adjust the power signal frequency for maximum efficiency without the need for additional voltage-adjusting circuits, using sub-carriers generated from a base carrier to optimize power transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional circuits are added to manage power receivers and control power supply in contactless systems, then power management capability is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The power receiver's transmission/reception circuit performs multiple functions: it transmits position and resonant frequency detection signals, receives power signals, and manages communication with the power feeding device. This multi-functionality eliminates the need for separate dedicated circuits for each function, reducing overall device complexity while maintaining reliable power management capability.
2Ease of operation
If multiple circuits are added to specify and manage power feeding users, then power supply control is improved, but manufacturing cost increases
Solution Approach 1:
The patent combines the functions of user identification, power management, and communication into a single integrated transmission/reception circuit at the power receiver. This merging of functions allows the system to achieve ease of operation in power supply control without requiring multiple separate circuits, thereby reducing manufacturing cost.
3Loss of energy
If voltage-adjusting circuits are added to optimize power transmission efficiency, then power transmission efficiency is improved, but device complexity increases
Solution Approach 1:
The system optimizes power transmission efficiency by dynamically changing the frequency parameter of the power signal based on the resonant frequency detection results, rather than adding voltage-adjusting circuits. This parameter change approach achieves high power transmission efficiency while avoiding the complexity of additional voltage control circuits.
Solution Approach 2:
The power receiver transmits resonant frequency detection signals back to the power feeding device, creating a feedback loop. The power feeding device uses this feedback information to adjust the power signal frequency, optimizing power transmission efficiency without requiring complex voltage-adjusting circuits at the receiver end.
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 enables convenient and efficient power supply to power receivers with reduced device complexity and cost, ensuring high power transmission efficiency by identifying and managing receivers and adjusting signal frequencies accordingly.
Implementation Method 1
the power receiver transmits a position and resonant frequency detection signal using a plurality of signals having different frequencies to the power feeding device
Implementation Method 2
the power feeding device detects a resonant frequency which is specific to the power receiver, on the basis of the position and resonant frequency detection signal received
Implementation Method 3
controls the frequency of a power signal to be transmitted (also referred to as a power signal for power transmission) to the power receiver on the basis of the information
Data Source
AI summary
An object is to provide a power feeding system and a power feeding method which are more convenient for a power feeding user at the power receiving end, without causing increases in complexity and size of devices. An object is to provide a power feeding system and a power feeding method which also allow a power feeding provider (a company) which feeds power (at the power transmitting end) to supply power without waste. A power feeding device which wirelessly supplies power to a power receiver detects the position and the resonant frequency of the power receiver by receiving a position and resonant frequency detection signal using a plurality of sub-carriers having different frequencies from the power receiver, and controls the frequency of a power signal to be transmitted to the power receiver on the basis of the information. An efficient power feeding service can be offered by transmitting a power signal to the power receiver at an optimum frequency for high power transmission efficiency.