Contactless Power Feeding System with Efficiency-Based Target Update

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Solution Overview

Problem

Existing contactless power feeding systems face challenges in quickly bringing the secondary measured value closer to the secondary target value due to their reliance on correcting the primary target value based solely on the secondary instruction and measured values, without considering transfer efficiency.

Innovation Solution

The system includes a primary control circuit that alternately performs control and update processing, calculating the primary target value based on transfer efficiency determined by both primary and secondary measured values, and updates the primary target value to efficiently align the secondary measured value with the secondary target value.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Speed

If the primary target value is corrected based only on the secondary instruction value and secondary measured value, then the control system is simple, but the secondary measured value cannot be brought closer to the secondary target value quickly

Engineering Contradiction:

Improvespeed of convergence to target valueVSAvoidcomplexity of control processing

Core Design Contradiction:

SpeedVSDevice complexity

Solution Approach 1:

The patent implements a feedback mechanism where the primary control circuit acquires both the primary measured value and secondary measured value, calculates transfer efficiency based on these measurements, and uses this efficiency information to update the primary target value. This closed-loop feedback approach enables faster convergence of the secondary measured value to the secondary target value by continuously adjusting the primary power based on actual transfer conditions.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The system performs self-optimization by automatically calculating transfer efficiency from the measured values and using this information to adjust the primary target value without external intervention. The control system serves itself by generating the correction information internally through efficiency calculations, eliminating the need for complex external control mechanisms while achieving fast convergence.

Inventive Principle:

Principle #25Self-service

2Loss of time

If the primary target value is updated frequently to quickly adjust secondary power, then the response speed improves, but the control processing complexity increases

Engineering Contradiction:

Improvetime to stabilize power deliveryVSAvoidcomplexity of update processing

Core Design Contradiction:

Loss of timeVSDevice complexity

Solution Approach 1:

The patent merges the control processing and update processing into a unified alternating execution framework. The primary control circuit alternately performs control processing (adjusting primary power based on primary measured value) and update processing (calculating transfer efficiency and updating primary target value). This integration allows frequent updates without requiring separate complex control systems, reducing overall complexity while maintaining fast response.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The system implements periodic alternating execution of control processing and update processing. By dividing the control cycle into periodic phases where control processing and update processing alternate, the system achieves frequent adjustments without continuous complex calculations. This periodic structure enables fast stabilization while keeping each processing phase relatively simple.

Inventive Principle:

Principle #19Periodic action

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 allows for quicker stabilization of secondary power delivery to the receiving coil, reducing the time required to achieve good stability and reliability in power transfer.

Implementation Method 1

a power receiving coil (41) to be electromagnetically coupled to the power feeding coil (31)

Methodology Applied

Scientific EffectElectromagnetic coupling: Electromagnetic Induction

Data Source

PatentUS11128181B2Contactless power feeding system and contactless power transfer system

Publication Date: 2021.09.21 PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD

AI summary

A contactless power feeding system includes: a primary circuit for supplying primary power to a power feeding coil; and a primary control circuit for controlling the primary circuit. The primary control circuit acquires, from a secondary control circuit, a secondary measured value and a secondary target value of secondary power received by a power receiving coil. The primary control circuit performs control processing and update processing alternately and repeatedly. The control processing is processing of controlling the primary circuit to bring the primary measured value into conformity with a primary target value. The update processing is processing of updating the primary target value. The update processing includes processing of calculating the primary target value based on transfer efficiency to be determined by the primary measured value and the secondary measured value and on the secondary target value.