Wireless Power Receiver Voltage Control for Efficiency
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Solution Overview
Problem
Conventional wireless power receivers using resonance systems face inefficiencies due to the necessity of a DC-DC converting circuit, which compromises energy transmission efficiency and requires external passive elements, limiting operation to frequencies below several MHz.
Innovation Solution
A wireless power receiver that omits the DC-DC converting circuit when the received voltage is below the charging unit's allowable voltage, using a control unit to either convert or directly output the rectified power based on voltage levels, thereby optimizing energy transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a DC-DC converting circuit is used in the wireless power receiver, then the output voltage can be adjusted to match the charging unit requirements, but the energy transmission efficiency is compromised and external passive elements are required
Solution Approach 1:
The patent extracts and removes the DC-DC converting circuit from the wireless power receiver system. By eliminating this circuit, the invention avoids the energy losses and external passive element requirements while maintaining voltage adaptability through alternative means (direct rectification output matching the charging unit voltage requirements)
Solution Approach 2:
The rectifying circuit is designed to directly output voltage that can satisfy different charging unit requirements without requiring additional conversion circuits. This multi-functional approach allows the same circuit to serve both rectification and voltage matching functions
2Adaptability or versatility
If a DC-DC converting circuit is used in the wireless power receiver, then voltage regulation is achieved, but the operational frequency is limited to several MHz or less
Solution Approach 1:
The patent removes the DC-DC converting circuit which was limiting the operational frequency. By eliminating this circuit component, the system can operate at higher frequencies (above several MHz) while maintaining voltage regulation through the rectifying circuit's direct output capability
3Reliability
If the wireless power receiver always converts received power through a converting circuit, then voltage matching is ensured, but unnecessary conversions cause operational losses when received voltage is already below threshold
Solution Approach 1:
The patent implements a dynamic control mechanism where the converting circuit is selectively activated or deactivated based on the received voltage level. When the rectified voltage is already below the charging unit threshold, the converting circuit is bypassed, avoiding unnecessary conversions and energy losses while still ensuring voltage matching when needed
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 enhances energy transfer efficiency by eliminating unnecessary conversions and reducing operational losses, particularly when the received voltage is below the charging unit's threshold, improving overall power reception and charging performance.
Implementation Method 1
a power receiving coil configured to receive wirelessly transmitted power having a voltage
Implementation Method 2
The wireless charging system uses wireless power transmission/reception technology
Data Source
AI summary
A method for controlling an electronic device including a charging circuit is provided. The method includes receiving power wirelessly from a power transmitting device; rectifying the received power; based on a voltage of the rectified power being greater than or equal to an allowable voltage of the charging circuit, controlling to convert the rectified power through a converting circuit of the electronic device and to output the converted power to the charging circuit for charging a battery of the electronic device, wherein the allowable voltage relates to a maximum voltage or a preferable voltage to be applied to the charging circuit; and based on the voltage of the rectified power being less than the allowable voltage of the charging circuit, controlling to stop converting the rectified power and to output the rectified power to the charging circuit by connecting the rectifying circuit to the charging circuit.