Contactless Power Transmitter State Switching Control
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Solution Overview
Problem
In contactless electric power transmission systems, variations in the positional relationship between power transmitting and receiving devices, as well as the presence of obstacles, lead to unstable power transmission states, causing frequent switching between receivable and unreceivable states, resulting in mismatched control information between devices.
Innovation Solution
A power transmitting device and a power receiving device that include a data communicator, a state switching number counter, and a controller to obtain identification information and count state switchings between power unreceivable and receivable states, allowing for controlled electric power transmission based on these counts to stabilize the power transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If contactless electric power transmission is performed over a larger distance or with positional deviation, then convenience and application scope are enhanced, but power transmission stability deteriorates due to state switching between receivable and unreceivable
Solution Approach 1:
The patent implements a feedback mechanism where the power receiving device detects its own power reception state and communicates this information back to the power transmitting device. The transmitting device then adjusts transmission parameters based on this feedback to maintain stable power transmission even when positional relationships vary, thereby resolving the contradiction between ease of operation and reliability.
2Reliability
If power transmission control is adjusted to maintain stability, then power transmission reliability is improved, but control information mismatch occurs between transmitting and receiving devices
Solution Approach 1:
The patent merges the control functions of both transmitting and receiving devices by having them share common control information through bidirectional communication. Both devices maintain consistent state information and coordinate their control actions, eliminating information mismatch while maintaining transmission stability.
Solution Approach 2:
The receiving device provides feedback about its power reception state to the transmitting device, and the transmitting device adjusts its control based on this feedback. This closed-loop control ensures both devices operate with consistent information, preventing control information mismatch while maintaining reliable power transmission.
3Loss of energy
If electromagnetic induction method is used for contactless power transmission, then power transmission efficiency is maintained, but transmission distance is limited to several millimeters and precise position matching is required
Solution Approach 1:
The patent employs magnetic resonance technology that dynamically adjusts the resonant frequency of both transmitting and receiving coils to match, enabling efficient power transmission over larger distances without requiring precise positional alignment. The system adapts to positional variations through frequency tuning rather than requiring fixed positioning.
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 ensures stable electric power transmission by matching control information with the actual transmission state, preventing frequent switching and improving user experience by maintaining consistent power delivery.
Implementation Method 1
contactless electric power transmission (no-contact-point electric power transmission) that enables electric power transmission by using electromagnetic induction
Implementation Method 2
a contactless electric power transmitting method using a magnetic resonance phenomenon (called magnetic resonance method in the following)
Data Source
AI summary
A power transmitting device includes a power transmitter (21) transmitting electric power in a contactless manner, a data communicator (22) obtaining identification information of at least one power receiving device that has become possible to receive electric power transmitted from the power transmitter (21), a power receiving device finding/separation detector (261) counting a number of state switchings between a power unreceivable state and the power receivable state during a predetermined period of time, for each power receiving device of which identification information has been obtained, and a power transmission controller (263) controlling electric power transmission performed by the power transmitter (21), on the basis of the number of state switchings counted by the power receiving device finding/separation detector (261).