Wireless Power Receiver Resonance Tuning via Switched Capacitor Network
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Solution Overview
Problem
Existing wireless power supply systems face challenges in reducing the number of circuit components and costs associated with tuning resonance frequencies, particularly in systems using electric field/magnetic field resonance methods, where multiple capacitors and switches increase circuit area and complexity.
Innovation Solution
A wireless power supply system that employs a reception coil with a series-connected first capacitor and a switch in parallel with a second capacitor, controlled by a unit adjusting the duty ratio to match the frequency of the electric power signal, allowing for variable capacitance and reduced component count, and optionally includes auxiliary coils and capacitors to form closed loops for further resonance tuning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple capacitors and switches are used to achieve variable capacitance for resonance frequency tuning, then the resonance frequency can be adjusted to match the electric power signal frequency, but the number of circuit components increases, leading to increased circuit area and costs
Solution Approach 1:
The patent applies dynamic switching of capacitor connections to achieve variable capacitance. The switch dynamically reconfigures the capacitor network between series and parallel connections based on the required capacitance value, enabling resonance frequency tuning without requiring multiple discrete capacitors for each frequency step.
Solution Approach 2:
The patent changes the electrical parameters (capacitance values) by reconfiguring the same physical capacitors in different connection patterns. By switching between series and parallel configurations, the effective capacitance parameter is dynamically adjusted to match different resonance frequency requirements.
2Adaptability or versatility
If multiple capacitors and switches are used for resonance frequency tuning, then the system can adapt to different frequencies, but the circuit area increases due to the increased number of components
Solution Approach 1:
The patent merges multiple capacitor functions into a single reconfigurable capacitor network. Instead of having separate capacitors for each capacitance value, the same set of capacitors is combined in different configurations (series/parallel) to provide multiple capacitance values, thereby reducing the total component count and circuit area.
Solution Approach 2:
The capacitor network serves multiple functions: it provides different capacitance values for different frequency tuning requirements, and the same physical components are used across different operating conditions. This multi-functionality eliminates the need for dedicated components for each frequency step.
3Adaptability or versatility
If multiple switches are used for capacitor switching, then variable capacitance can be achieved, but the voltage stress on switches increases, requiring high-breakdown voltage elements that increase costs
Solution Approach 1:
The capacitor network is segmented into multiple smaller capacitor units that can be independently switched. This segmentation allows the voltage stress to be distributed across multiple components rather than requiring a single switch to handle the full voltage, enabling the use of lower-breakdown voltage switches.
Solution Approach 2:
The switching strategy is dynamically optimized to minimize voltage stress on individual switches. The control system activates switches in sequences that prevent excessive voltage accumulation, and the dynamic reconfiguration allows switches to operate within safer voltage ranges during different tuning phases.
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 configuration enables efficient resonance frequency adjustment with fewer components, reduces voltage stress on switches, and allows the use of low-breakdown voltage elements, thereby minimizing costs and circuit complexity while maintaining high power transfer efficiency.
Implementation Method 1
a reception coil configured to receive an electric power signal including any one of an electric field, a magnetic field, and an electromagnetic field, transmitted from a wireless power supply apparatus
Implementation Method 2
The resonance frequency of the resonance circuit thus formed is tuned to the frequency of the electric power signal S1
Data Source
AI summary
In a wireless power supply system, a first capacitor is arranged in series with an antenna. A second capacitor and a switch are arranged in series on a path arranged in parallel with the first capacitor. A control unit adjusts the duty ratio of the switch according to the frequency of an electric power signal.