Wireless Power Receiver Resonance Switching for Freewheeling Current

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Solution Overview

Problem

Existing wireless power reception systems face challenges in managing high voltage levels during wireless charging, which can lead to damage and increased production costs due to high current conduction in transistors during freewheeling operations.

Innovation Solution

The system includes a power receiving circuit with capacitors and coils that can change connection states based on voltage thresholds, increasing impedance and reducing coupling to manage high voltage levels by controlling switches and transistors to freewheel power, thereby reducing current conduction in transistors.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If the power receiving circuit operates at high voltage levels during wireless charging, then power reception efficiency is improved, but transistor damage risk increases due to high current conduction during freewheeling operations

Engineering Contradiction:

Improvepower reception efficiencyVSAvoidtransistor damage risk

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent applies dynamics by making the impedance of the power receiving circuit adjustable rather than fixed. The control circuit dynamically changes the connection state of capacitors and coils based on operating conditions, specifically increasing impedance during freewheeling operations to reduce current stress on transistors while maintaining optimal power reception efficiency during normal charging

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the electrical parameters (impedance, connection state) of the power receiving circuit components based on operating conditions. By detecting voltage thresholds and adjusting the connection state of capacitors and coils accordingly, the system optimizes power reception efficiency while protecting transistors from damage during freewheeling operations

Inventive Principle:

Principle #35Parameter changes

2Productivity

If transistors are designed to handle high current during freewheeling, then power reception capability is improved, but production cost increases

Engineering Contradiction:

Improvepower reception capabilityVSAvoidproduction cost

Core Design Contradiction:

ProductivityVSEase of manufacture

Solution Approach 1:

Instead of using expensive high-current transistors, the patent changes the impedance parameter of the power receiving circuit dynamically. This allows the use of standard, lower-cost transistors while achieving the same power reception capability by reducing current stress through impedance adjustment during freewheeling operations

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent replaces the mechanical solution of using physically larger, more expensive transistors to handle high current with an electrical solution - adjusting the impedance of the power receiving circuit. This substitution achieves the same protective effect while using standard, lower-cost components

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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 effectively reduces the magnitude of current conducted in transistors during freewheeling, preventing damage and improving production efficiency by managing high voltage levels and reducing power reception costs.

Implementation Method 1

a wireless power transmission device may generate an electromagnetic field by applying current to a transmission coil, and the generated electromagnetic field may form an induced electromotive force in a reception coil of a wireless power reception device, thereby wirelessly transmitting power

Methodology Applied

Scientific EffectElectromagnetic induction: Electromagnetic Induction

Implementation Method 2

rectify the power received from the second electronic; identify a first voltage of power rectified to direct current (DC) through the rectifier

Methodology Applied

Scientific EffectRectification:

Data Source

PatentUS20250007313A1Electronic device for wirelessly receiving power and method of operating the same

Publication Date: 2025.01.02 SAMSUNG ELECTRONICS CO LTD

AI summary

A first electronic device configured to receive power wirelessly according to an embodiment may include: a power receiving circuit including a plurality of capacitors, at least one coil, and at least one switch, a rectifier including a plurality of transistors, and a control circuit. The control circuit according to an embodiment may be configured to: set the plurality of capacitors and the at least one coil to a first connection state through the at least one switch, based on a frequency specified by a second electronic device transmitting power wirelessly; receive alternating current (AC) power wirelessly from the second electronic device through the power receiving circuit set to the first connection state; control the plurality of transistors included in the rectifier to rectify the power received from the second electronic device; identify a first voltage of power rectified to direct current (DC) through the rectifier; set the plurality of capacitors and the at least one coil to a second connection state through the at least one switch to increase an impedance of the plurality of capacitors and/or change a resonant frequency of the power, based on identifying that the first voltage is greater than a first threshold; and control the plurality of transistors included in the rectifier to freewheel the power received from the second electronic device.