Multiphase Inductive Power Supply System With Segmented Tank Circuits
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Solution Overview
Problem
Conventional power supply cords for handheld electronics are inconvenient, occupy space, and increase costs, especially for managing multiple devices, as they require physical connection and storage, leading to inefficiencies and bulkiness.
Innovation Solution
A multiphase inductive coupling system with a primary circuit comprising discrete tank circuits and a controller that energizes them out of phase, paired with secondary coils for efficient wireless power transfer, reducing current requirements and component size, and converting power to DC.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If single phase wireless power transfer is used, then system simplicity is maintained, but power loss and heat generation increase
Solution Approach 1:
The single phase power transfer system is segmented into multiple independent tank circuits operating in different phases. Each tank circuit processes a portion of the power transfer, distributing the current load and reducing power loss and heat generation in any single circuit element.
Solution Approach 2:
The system employs periodic action by operating multiple tank circuits with different phase shifts (e.g., 120 degrees apart in a three-phase system). This periodic staggering of power transfer across multiple phases reduces peak current requirements and associated losses while maintaining continuous power delivery.
2Loss of energy
If larger components are used to reduce current loss, then power transfer efficiency improves, but device size and volume increase
Solution Approach 1:
The power transfer function is segmented across multiple smaller tank circuits rather than using a single large component. Each tank circuit handles a fraction of the total power, allowing the use of smaller inductors and capacitors that collectively achieve the same efficiency without the volume of a single large component.
Solution Approach 2:
The system changes operating parameters by introducing multiple phases with different timing relationships. This parameter change allows the use of smaller component values (inductance and capacitance) while maintaining or improving power transfer efficiency through the combined effect of multiple phases.
3Adaptability or versatility
If multiple power supply cords are used to charge multiple devices, then power availability is ensured, but space occupation and storage complexity increase
Solution Approach 1:
The wireless power system provides multi-functionality by enabling simultaneous power transfer to multiple devices through a single integrated system. The multiple tank circuits can independently or collectively serve different devices, eliminating the need for multiple separate power supply cords and their associated storage requirements.
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 reduces power loss and heat generation, enabling more efficient and compact wireless power transfer to multiple devices, improving convenience and cost-effectiveness.
Implementation Method 1
These technologies typically involve the use of electromagnetic coupling (or inductively coupling) that provides a wireless bridge between the power supply and the remote device
Implementation Method 2
Each secondary coil also includes a rectifier for converging the multiphase power and converting it into DC power
Data Source
AI summary
A multiphase inductive power supply wirelessly transmits power in multiple phases. A primary circuit energizes multiple tank circuits in an out of phase relationship. A secondary circuit receives the power and recombines the power. The amount of energy in each phase is reduced compared to transferring the same amount of power using a single phase inductive power supply.