Wireless Charger Receiver Filter for Load Signal Interference
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Solution Overview
Problem
Existing wireless charging systems face interference issues due to signals from the load within the charging frequency range, which can degrade communication between the receiver and charger, leading to overheating, undercharging, or slow charging.
Innovation Solution
Incorporating a filter between the modulation circuitry and signal generating circuitry of the power receiver unit to suppress load signal interference, allowing for improved charging efficiency and communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If wireless charging is implemented using Qi standard with modulation, then power transmission capability is improved, but communication reliability deteriorates due to load signal interference
Solution Approach 1:
The patent divides the wireless charging system into distinct functional stages: a power mode for power transmission and a communication stage for data exchange. By segmenting the operation into time-separated phases, the system can transmit power and communicate without simultaneous interference from load signals, resolving the contradiction between power transmission capability and communication reliability
Solution Approach 2:
The system employs periodic alternation between power mode and communication stage. The modulation is applied during specific communication stages that occur periodically within the overall power transmission cycle, allowing the system to maintain both strong power transmission capability and reliable communication by preventing overlap between power delivery and data exchange operations
2Loss of information
If modulation is applied to power signal for communication, then data transmission capability is improved, but signal interference increases from load signals
Solution Approach 1:
The patent introduces a controller as an intermediary that manages the timing and coordination between power transmission and communication operations. The controller ensures that modulation for data transmission occurs only during designated communication stages when load signals are suppressed or absent, thereby enabling reliable data transmission without the harmful interference that would otherwise be generated by simultaneous power delivery operations
Solution Approach 2:
Modulation is applied periodically during specific communication stages rather than continuously. This periodic modulation approach allows data transmission to occur only when interference conditions are favorable, maintaining data transmission capability while avoiding the periods when load signals would cause harmful interference during power transmission phases
3Productivity
If continuous power transmission is maintained, then charging efficiency is improved, but communication interruptions occur due to interference
Solution Approach 1:
The system implements periodic communication stages within the continuous power transmission cycle. During these brief periodic intervals, modulation is enabled for communication while power transmission continues or pauses minimally. This periodic approach maintains high overall charging efficiency while ensuring regular communication opportunities without continuous interruptions
Solution Approach 2:
The controller preliminarily plans and coordinates the timing of communication stages within the power transmission sequence. By pre-arranging when communication will occur during the charging process, the system can maintain continuous or near-continuous power transmission while ensuring that communication opportunities are built into the schedule, preventing unexpected interruptions and maintaining both charging efficiency and communication reliability
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 filter effectively reduces interference, enhancing the charging process by maintaining accurate communication and preventing inefficiencies such as overheating or undercharging.
Implementation Method 1
The power signal receiver includes a filter to suppress a load signal to prevent interference in the modulated wireless power signal
Implementation Method 2
The communication modulator applies a modulation to the received wireless power signal
Implementation Method 3
The power pick-up unit receives a wireless power signal
Data Source
AI summary
Embodiments of an apparatus are disclosed. In an embodiment, a power receiver unit is disclosed. The power receiver unit includes a power pick-up unit, a communication modulator, and a filter. The power pick-up unit receives a wireless power signal. The communication modulator applies a modulation to the received wireless power signal. The filter suppresses a load signal from a load of the wireless charge receiver to prevent interference with the modulation.