Wireless Charging Circuit RC Topology for High Efficiency
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Solution Overview
Problem
Traditional wireless charging systems suffer from low power conversion efficiency due to switching and conduction losses, magnetic saturation, and heat generation, limiting their ability to support high-voltage and high-current quick charging.
Innovation Solution
A wireless charging circuit that includes an acquisition unit for battery voltage information, a charging control unit to determine current information, a communication unit for transmitting data to an external charging device, and a switching unit to directly input induced charging DC into the battery, eliminating the need for inductive devices and thereby reducing energy losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a traditional DC-DC buck circuit with inductor and MOSFET is used for wireless charging, then the charging function is achieved, but switching loss and conduction loss occur reducing power conversion efficiency
Solution Approach 1:
The patent extracts and removes the inductor from the traditional DC-DC buck circuit, transforming it into a resistor-capacitor (RC) circuit. This extraction eliminates the magnetic saturation loss and conduction loss associated with the inductor, directly addressing the energy loss problem while simplifying the overall circuit structure.
Solution Approach 2:
The patent substitutes the mechanical/electromagnetic switching mechanism (MOSFET with inductor) with an electronic control mechanism using an RC circuit. The RC circuit achieves voltage regulation through resistive and capacitive elements controlled by a microcontroller, replacing the traditional electromagnetic energy storage and release mechanism with an electronic timing and voltage division approach.
2Productivity
If high voltage and high current are used for quick charging, then charging speed is improved, but heat generation increases limiting the charging capability
Solution Approach 1:
The patent converts the potentially harmful heat generation into a manageable parameter by using the RC circuit's natural time constant characteristics. The circuit accepts high voltage and current input but transforms them through resistive heating (controlled dissipation) and capacitive energy storage, delivering regulated output that prevents excessive temperature rise while maintaining quick charging capability.
Solution Approach 2:
The patent changes the operating parameters of the charging circuit by using variable resistance and capacitance values that can be adjusted based on charging conditions. The microcontroller dynamically controls the RC circuit parameters to optimize the balance between charging speed and heat generation, allowing high-power charging when conditions permit and reducing power when temperature concerns arise.
3Use of energy by moving object
If an inductor is used in the wireless charging circuit, then energy storage and transfer is enabled, but magnetic saturation loss and conduction loss occur
Solution Approach 1:
The patent extracts the inductor from the circuit entirely, eliminating the source of magnetic saturation loss and conduction loss. Energy transfer is achieved instead through the RC circuit's capacitive energy storage and resistive voltage regulation, controlled by a microcontroller that manages the charging process without requiring electromagnetic inductance.
Solution Approach 2:
The patent substitutes the electromagnetic energy storage mechanism (inductor) with an electronic control mechanism (RC circuit with microcontroller). The RC circuit achieves energy transfer through voltage and current control based on capacitive charging and discharging cycles, replacing the continuous electromagnetic field approach with a pulsed electronic control approach that avoids magnetic losses.
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 significantly improves power conversion efficiency and charging efficiency, allowing for safe and efficient wireless quick charging with high-voltage and high-current, with demonstrated efficiency as high as 98% and reduced heat generation.
Implementation Method 1
a receiving unit, configured to generate a charging DC by inducing an electrical signal
Data Source
AI summary
A wireless charging circuit, a wireless charging method, a wireless charging system and a mobile terminal are provided. The wireless charging circuit includes: an acquisition unit that acquires voltage information of a battery in the mobile terminal; a charging control unit that obtains the voltage information of the battery, and determine current information of the battery according to the voltage information during a charging process of the battery; a first communication unit that transmits the voltage information and the current information of the battery to an external wireless charging device; a receiving unit that generates a charging Direct Current (DC) by inducing an electrical signal generated by the external wireless charging device according to the voltage information and the current information of the battery; and a switching unit configured to, when the switching unit is an on state, input the charging DC into the battery through the acquisition unit.