Wireless Charging Resonance Switching for Lower Loss and Heat
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Solution Overview
Problem
Existing wireless charging technologies face inefficiencies and high charging losses in both constant-voltage frequency-regulation and private fast charging modes, leading to temperature rises and reduced charging speed.
Innovation Solution
A wireless charging module with a tunable capacitor module and control circuit that adjusts equivalent capacitance values using controllable switches to adapt to different working scenarios, enabling resonant or approximately resonant states for high efficiency and compatibility with conventional constant-voltage frequency-regulation charging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If resonant capacitors are designed according to constant-voltage frequency-regulation charging mode requirements, then compatibility with conventional charging mode is ensured, but working efficiency is low and charging loss is large
Solution Approach 1:
The patent applies a tunable capacitor module that can dynamically adjust its capacitance value between a first capacitance value and a second capacitance value based on the charging mode. This dynamic adjustment allows the system to optimize resonance conditions for each mode, reducing energy loss while maintaining compatibility with conventional charging modes.
Solution Approach 2:
The patent changes the capacitance parameter of the resonant capacitor based on different charging modes. By switching between a first capacitance value for constant-voltage frequency-regulation mode and a second capacitance value for private fast charging mode, the system achieves optimal performance in each mode while reducing overall energy loss.
2Adaptability or versatility
If resonant capacitors are designed for constant-voltage frequency-regulation charging mode, then compatibility is ensured, but temperature rise is obvious and over-temperature power reduction is easily triggered
Solution Approach 1:
The tunable capacitor module dynamically adjusts capacitance based on charging mode requirements. In private fast charging mode, the optimized second capacitance value reduces resistive losses and improves efficiency, thereby reducing temperature rise and preventing over-temperature power reduction.
Solution Approach 2:
By changing the capacitance parameter to a second capacitance value optimized for private fast charging mode, the system achieves better resonance conditions, reduces energy loss, and consequently reduces temperature rise during high-power charging operations.
3Device complexity
If fixed capacitance value is used, then device complexity is low, but the system cannot adapt to different working scenarios and charging efficiency is reduced
Solution Approach 1:
The patent introduces a tunable capacitor module with controllable switches that can adjust capacitance values based on different working scenarios. This dynamic configuration enables the system to achieve optimal charging efficiency in both constant-voltage frequency-regulation mode and private fast charging mode with minimal additional complexity.
Solution Approach 2:
The tunable capacitor module serves multiple functions by providing different capacitance values for different charging modes. This multi-functionality allows a single component to optimize performance across various working scenarios, improving charging efficiency without requiring separate capacitor configurations for each mode.
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
The module achieves efficient charging while maintaining compatibility with conventional modes, reducing losses and improving applicability and practicability of wireless charging technologies.
Implementation Method 1
a charging coil 21, a tunable capacitor module 22, a converter circuit 23
Implementation Method 2
the wireless charging module can work in a resonant or approximately resonant state with high charging efficiency
Data Source
AI summary
Example wireless charging methods and apparatus are described. In one example, a wireless charging module includes a control circuit, a charging coil, a tunable capacitor module, and a converter circuit. The converter circuit includes at least one of a rectifier circuit or an inverter circuit. The tunable capacitor module is connected in series between the charging coil and the converter circuit. The tunable capacitor module includes a plurality of capacitors and at least one controllable switch. The control circuit controls the at least one controllable switch to be turned on or off, to control an equivalent capacitance value of the tunable capacitor module. The equivalent capacitance value of the tunable capacitor module includes one of a first capacitance value or a second capacitance value.