Wireless Charging Waste Current Sensing for Heat and Power Loss
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Solution Overview
Problem
Wireless charging systems experience significant power loss and increased junction temperature due to unnecessary magnetic field power emission, leading to heat buildup in portable devices and reduced battery life in power packs.
Innovation Solution
A system with a voltage limiter and current sensor to adjust the magnetic field power based on waste current measurements, ensuring only the necessary power is delivered to the battery, with defined upper and lower limits for waste current to maintain efficient charging and prevent low power resets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the power device radiates continuous magnetic field power to ensure sufficient charging current, then the battery can be charged reliably, but power loss increases and junction temperature rises
Solution Approach 1:
The patent implements dynamic adjustment of magnetic field power by the power device based on real-time waste current feedback from the portable device. Instead of continuous fixed-power radiation, the system continuously adapts the transmitted power level to match actual charging needs, reducing energy loss while maintaining reliable charging operation.
Solution Approach 2:
The patent introduces a feedback mechanism where the portable device measures waste current and communicates this information back to the power device. This feedback loop enables the power device to adjust its magnetic field power output optimally, preventing both over-power transmission (which causes loss and heat) and under-power transmission (which compromises charging reliability).
2Stability of the object's composition
If the voltage limiter deducts waste current to maintain input voltage stability, then the charger IC receives stable voltage, but loss power increases and heats up the portable device
Solution Approach 1:
The patent applies preliminary action by having the power device pre-adjust its magnetic field power based on anticipated waste current levels. By proactively optimizing power transmission before excessive waste current accumulates, the system prevents both voltage instability and excessive heat generation in the portable device.
3Productivity
If the power device increases magnetic field power to reduce charging time, then charging speed improves, but power loss and heat generation increase
Solution Approach 1:
The patent implements dynamic power adjustment where the magnetic field power is continuously optimized based on real-time waste current measurements. This allows the system to achieve high charging speeds when needed while minimizing power loss, avoiding the need for continuously high power transmission that would cause excessive heat and energy waste.
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
Substantially reduces power loss and junction temperature, ensuring stable operation and extending battery life by optimizing power usage and reducing heat generation in portable devices.
Implementation Method 1
a power device (1) with an antenna (4) to receive power adjustment information from the portable device (2) to increase or to decrease the power of the magnetic field emitted by the antenna (4) of the power device (1)
Implementation Method 2
a portable device (2) with an antenna (5) exposed to the magnetic field and connected via a matching stage to a rectifier stage (6), to rectify an antenna signal
Implementation Method 3
a rectifier stage (6), to rectify an antenna signal
Implementation Method 4
a voltage limiter (9), to limit the rectified antenna signal, and to provide an input voltage at an input pin (10) of a charger IC (8)
Data Source
AI summary
A system of a power device and a portable device for wireless charging of a battery of the portable device. The power device includes an antenna to receive power adjustment information to increase or to decrease the power of the magnetic field emitted by the antenna of the power device and an antenna exposed to the magnetic field and connected via a matching stage to a rectifier stage. The portable device includes a voltage limiter, to limit the rectified antenna signal, and to provide an input voltage at an input pin of a charger IC. A charge voltage control stage is built to generate the power adjustment information for the power device to increase or to decrease the power of the magnetic field emitted by the antenna of the power device to steer the waste current within an upper limit and a lower limit.