Wireless Power Receiving Device Dynamic Charging Control
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Solution Overview
Problem
In wireless power supply systems, received power varies with positional changes and power conversion operations, leading to inefficient charging and potential overvoltage stress on circuits when trying to balance charging current and voltage for electric storage devices.
Innovation Solution
A wireless power receiving device with a power receiving resonant circuit, rectifier circuit, voltage conversion circuit, and charge control circuit that automatically adjusts charging current based on detected received and charging voltages to optimize power usage and prevent overcharging and overvoltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a high charging current is set to reduce charging time, then charging efficiency is improved, but received voltage becomes insufficient and the secondary battery cannot be charged
Solution Approach 1:
The patent implements dynamic adjustment of charging current based on real-time received voltage levels. The charge control circuit continuously monitors received voltage and adjusts the charging current accordingly, transitioning from a static high current setting to a dynamic control mechanism that adapts to changing power transmission conditions, thereby preventing voltage insufficiency while maximizing charging speed.
Solution Approach 2:
The patent changes the charging current parameter dynamically based on received voltage conditions. When received voltage is sufficient, higher charging current is applied to reduce charging time. When received voltage drops below threshold levels, the charging current is reduced or suspended to prevent overvoltage stress on the power receiving circuit, thus optimizing both charging efficiency and circuit safety.
2Reliability
If a low charging current is set to charge the secondary battery without fail, then charging reliability is improved, but charging time increases
Solution Approach 1:
The patent transitions from a static low charging current setting to a dynamic control system that adjusts charging current in real-time based on received voltage conditions. This allows the system to operate at higher currents when power transmission is stable and sufficient, reducing charging time while maintaining reliability through continuous monitoring and adaptive adjustment.
Solution Approach 2:
The patent implements a feedback control mechanism where the charge control circuit continuously monitors received voltage levels and adjusts charging current accordingly. This closed-loop control ensures that high charging currents are only applied when received voltage is sufficient, maintaining charging reliability while minimizing charging time through intelligent, condition-based current adjustment.
3Adaptability or versatility
If received power varies due to positional changes or power conversion operations, then adaptability is improved, but charging efficiency decreases and voltage stress on circuits increases
Solution Approach 1:
The patent implements dynamic control of charging current that adapts to varying received power conditions caused by positional changes or power conversion operations. The charge control circuit continuously adjusts charging parameters based on real-time received voltage measurements, maintaining optimal charging efficiency across different operational conditions while preventing circuit overvoltage stress.
Solution Approach 2:
The patent dynamically changes charging current parameters in response to received power variations. When received power is sufficient, higher charging currents are applied to maintain charging efficiency. When received power drops due to positional changes or power conversion operations, the charging current is adjusted downward to prevent overvoltage stress, thus adapting to varying conditions while minimizing energy loss.
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
Enables higher charging efficiency, reduces charging time, and ensures reliable operation by preventing overcharging and overvoltage stress on power receiving circuits.
Implementation Method 1
a power receiving resonant circuit including a power receiving coil and a resonant capacitor connected to the power receiving coil
Implementation Method 2
a power receiving resonant circuit including a power receiving coil and a resonant capacitor connected to the power receiving coil
Data Source
AI summary
A device includes a power receiving resonant circuit, a rectifier circuit, a voltage conversion circuit, and a charge control circuit that charges an electric storage device. The charge control circuit starts charging the electric storage device when a received voltage is greater than or equal to a first received voltage value, decreases a set value of a charging current for the electric storage device when a charging voltage is less than a predetermined charging voltage value, increases the set value of the charging current for the electric storage device when the received voltage is greater than or equal to a second received voltage value higher than a predetermined charging voltage value, and maintains the set value of the charging current when the charging voltage is greater than or equal to the predetermined charging voltage value and the received voltage is less than the second received voltage value.