Wireless Charging Receiver With Switched-Capacitor Voltage Conversion
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Solution Overview
Problem
Existing wireless charging technologies face inefficiencies in charging power and efficiency, particularly when the output voltage of the wireless charging transmitter differs significantly from the input voltage of the battery, leading to heat generation and reduced conversion efficiency in BUCK circuits.
Innovation Solution
The implementation of a wireless charging receiver that incorporates a switched-capacitor conversion chip to reduce the voltage and increase the current of the DC power supply, thereby improving charging power and efficiency. This chip operates in stages to output a second DC power supply with a lower voltage and higher current compared to the initial DC power supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a BUCK circuit is used to convert high voltage to low voltage for battery charging, then voltage conversion is achieved, but heat generation increases and conversion efficiency decreases
Solution Approach 1:
The patent changes the voltage conversion method from BUCK circuit to switched-capacitor circuit, altering the operating parameters and mechanism to achieve higher efficiency and lower heat generation
Solution Approach 2:
The patent replaces the BUCK circuit (inductor-based) with a switched-capacitor circuit (capacitor-based), substituting one electrical conversion mechanism with another that has superior efficiency characteristics
2Power
If the output voltage of the wireless charging transmitter is increased to improve charging power, then charging power increases, but the voltage difference from battery input voltage increases leading to reduced conversion efficiency
Solution Approach 1:
The patent changes the voltage conversion approach to accommodate high voltage transmission while maintaining efficient battery charging through switched-capacitor architecture
3Power
If a BUCK circuit is used for voltage conversion, then voltage step-down is achieved, but device complexity and heat dissipation requirements increase
Solution Approach 1:
The patent substitutes the BUCK circuit with a switched-capacitor circuit, simplifying the overall system by eliminating inductors and associated complexity while maintaining voltage conversion functionality
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 solution enhances charging efficiency and power by utilizing the switched-capacitor conversion chip, which achieves high conversion efficiency, up to 98%, and reduces heat generation associated with BUCK circuits, especially during high-power charging.
Implementation Method 1
The receiving coil is configured to couple an alternating magnetic field of a transmitting coil of a wireless charging transmitter, to obtain an AC power supply
Implementation Method 2
a switched-capacitor conversion chip configured to output a second DC power supply based on the first DC power supply
Data Source
Figure 1~2A
Figure 2B~3
Figure 4~5A
AI summary
The present disclosure relates to a wireless charging receiver, a charging system, and a terminal. The wireless charging receiver includes: a receiving coil, configured to couple an alternating magnetic field of a transmitting coil of a wireless charging transmitter, to obtain an AC power supply; a receiving chip, having an input coupled to the receiving coil and an output coupled to an input of a switched-capacitor conversion chip, and configured to convert the AC power supply into a first DC power supply; and the switched-capacitor conversion chip, having an output coupled to a battery, and configured to output a second DC power supply based on the first DC power supply, and charge the battery based on the second DC power supply.