Wireless Charging Transmitter Frequency Control

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Conventional wireless charging technologies do not consider the charging efficiency of receivers when transmitting power signals, leading to reduced charging power due to interference from signals of the same frequency.

Innovation Solution

A transmitter that determines a specific frequency for each receiver based on received signal strength indication (RSSI) and controls the output frequencies of PLLs to transmit power signals with different frequencies, maximizing charging power and efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If multiple wireless charging transmitters transmit power signals in a plurality of phases to overcome reflection by various structures, then the power signal reception is improved, but the charging efficiency of the receiver deteriorates due to frequency mismatch and interference

Engineering Contradiction:

Improvepower signal receptionVSAvoidcharging efficiency

Core Design Contradiction:

ReliabilityVSLoss of energy

Solution Approach 1:

The transmitter dynamically changes the frequency parameter of power signals based on RSSI feedback from the receiver. The controller adjusts the operating frequency within a frequency band to match the receiver's optimal charging frequency, thereby improving charging efficiency while maintaining reliable power signal reception despite environmental reflections

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The system implements a feedback mechanism where the receiver measures the received signal strength indication (RSSI) and transmits this information back to the transmitter. The controller uses this feedback to determine the optimal frequency and adjust the power signal transmission accordingly, creating a closed-loop control system that optimizes charging efficiency

Inventive Principle:

Principle #23Feedback

2Device complexity

If power signals are transmitted at a fixed frequency to simplify the transmission system, then the device complexity is reduced, but the charging power is reduced due to interference and frequency mismatch

Engineering Contradiction:

Improvetransmission system complexityVSAvoidcharging power

Core Design Contradiction:

Device complexityVSPower

Solution Approach 1:

The system transitions from a static fixed-frequency transmission approach to a dynamic frequency adjustment approach. The controller continuously monitors RSSI feedback and dynamically adjusts the transmission frequency to optimize charging power, while the frequency adjustment is constrained within a specific band to maintain system simplicity

Inventive Principle:

Principle #15Dynamics

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

The solution maximizes charging efficiency by minimizing interference among power signals, ensuring that receivers receive power signals with frequencies optimized for their specific charging needs.

Implementation Method 1

a plurality of phase locked loops (PLLs) that outputs single-phase power signals

Methodology Applied

Scientific EffectPhase Locked Loop frequency synthesis:

Implementation Method 2

a plurality of antennas that transmits power signals transmitted from the plurality of PLLs to a receiver

Methodology Applied

Scientific EffectElectromagnetic radiation:

Implementation Method 3

a controller that determines a specific frequency for the receiver based on a signal strength indication (RSSI) received from the receiver

Methodology Applied

Scientific EffectSignal strength detection:

Data Source

PatentUS10951071B2Wireless charging system for using frequency control

Publication Date: 2021.03.16 WARP SOLUTION INC

AI summary

Disclosed is a transmitter used for a wireless charging system. The transmitter includes a plurality of phase locked loops (PLLs) that outputs single-phase power signals, a plurality of antennas that transmits power signals transmitted from the plurality of PLLs to a receiver, and a controller that determines a specific frequency for the receiver based on a signal strength indication (RSSI) received from the receiver and allows output frequencies of the plurality of PLLs to be different from each other in a specific frequency band preset based on the specific frequency.