Wireless Power Transfer Initialization Using Dual Load-State Measurement

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Solution Overview

Problem

Current wireless power transfer systems face challenges in efficiently and reliably initiating power transfer operations with minimal delay, ensuring safe conditions, and optimizing system performance for varying loads and placements, particularly in high-power applications like kitchen appliances.

Innovation Solution

A method involving a power receiver and transmitter that utilize load states and measurements to efficiently transition from a non-power transfer phase to a power transfer phase, with the power transmitter adjusting the power transfer signal based on initial and final load state measurements to achieve a desired operating point.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the power transmitter waits for full system readiness before initiating power transfer, then safety and reliability are improved, but the initialization time and delay increase

Engineering Contradiction:

Improvepower transfer initialization reliabilityVSAvoidpower transfer initialization time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent performs preliminary measurements of power transfer parameters in different load states before initiating full power transfer. The transmitter measures parameters with the load decoupled, then with the load coupled, and uses these pre-obtained measurements to determine safe operating conditions and initialize power transfer quickly without waiting for full system readiness protocols

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The initialization process is segmented into distinct phases: first measuring power transfer parameters with load decoupled, then with load coupled, and finally initializing power transfer based on these segmented measurements. This segmentation allows each measurement to be performed independently and quickly, reducing total initialization time while maintaining reliability

Inventive Principle:

Principle #1Segmentation

2Measurement precision

If the system performs comprehensive measurements in both load decoupled and load coupled states, then measurement accuracy and system optimization are improved, but the complexity and communication overhead increase

Engineering Contradiction:

Improvepower transfer parameter measurement accuracyVSAvoidinitialization process complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent performs measurements in both load decoupled and load coupled states, which is more than the minimum single-state measurement. These excessive measurements provide redundant information that enables accurate determination of power transfer parameters and safe operating conditions, improving measurement precision while the structured approach keeps complexity manageable

Inventive Principle:

Principle #16Partial or excessive action

3Productivity

If the power transmitter quickly initiates power transfer without extensive measurements, then productivity and speed are improved, but the safety and reliability decrease

Engineering Contradiction:

Improvepower transfer initialization speedVSAvoidpower transfer safety

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The system performs quick preliminary measurements in both load states before power transfer initiation. These rapid measurements provide sufficient safety verification without extensive delays, enabling the transmitter to quickly determine safe operating conditions and initiate power transfer with both speed and safety

Inventive Principle:

Principle #10Preliminary 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 enables faster, safer, and more reliable power transfer initialization, reducing complexity and communication overhead, and improving flexibility and accuracy in power transfer operations.

Implementation Method 1

a power transmitter transferring power to a power receiver using a power transfer signal inducing a current in a power receiver coil of the power receiver

Methodology Applied

Scientific EffectElectromagnetic induction: Electromagnetic Induction

Data Source

PatentUS20250350156A1Wireless power transfer

Publication Date: 2025.11.13 KONINKLIJKE PHILIPS NV

AI summary

A power receiver for a wireless power transmitter transmits (703) a request for a power transfer phase while the power receiver is in a load state where a load is disconnected from the power receive coil (107). When receiving (705) the request, the power transmitter proceeds to measure (707) a power transfer parameter after which an acknowledgement is transmitted to (709) and received by (711) the power receiver (105). In response, it proceeds to change (713) to a new load state where the load is connected to the power receive coil (107). It transmits (715) a second request which when received (717) causes the power transmitter (101) to perform another measurement (719) of a power transfer parameter. Power transfer is then started (721) in dependence on the measurement results. An improved initialization of a power transfer phase may be provided.