Wireless Power Transmission Apparatus with Shared Switch Circuit
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Wireless power transmission systems using electromagnetic induction or resonance types face issues with power leakage and counter-electromotive force between conductive patterns, leading to insufficient power delivery to specific conductive patterns.
Innovation Solution
The system configures multiple conductive patterns to share a part of a switch circuit for generating AC current and employs a control circuit to apply power only to the selected conductive pattern, preventing power application to other patterns, thereby reducing unnecessary power generation and counter-electromotive force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple conductive patterns are used to improve charging position freedom, then adaptability is improved, but power leakage and counter-electromotive force between patterns increase causing insufficient power delivery
Solution Approach 1:
The system divides the power transmission function into multiple independent conductive patterns (first, second, third patterns). Each pattern can be independently controlled through separate switch circuits, allowing selective activation based on charging position requirements while preventing power leakage to inactive patterns.
Solution Approach 2:
The control circuit dynamically selects which conductive pattern to activate based on real-time charging position detection. By switching between different conductive patterns only when needed, the system maintains adaptability for various charging positions while minimizing power leakage and counter-electromotive force in inactive patterns.
2Power
If separate bridge circuits are connected to each conductive pattern to improve power delivery, then power delivery capability is improved, but device complexity increases
Solution Approach 1:
Multiple conductive patterns share common bridge circuit components (switches S1-S4, capacitors C1-C2). The same bridge circuit structure serves multiple conductive patterns through selective switching, reducing overall device complexity while maintaining full power delivery capability to any active pattern.
Solution Approach 2:
The system merges the bridge circuit elements across multiple conductive patterns. Instead of having completely separate bridge circuits for each pattern, common switches and capacitors are shared, and the control circuit selectively connects them to different patterns as needed, thereby reducing component count and complexity.
3Adaptability or versatility
If power is applied to multiple conductive patterns simultaneously to support various charging positions, then adaptability is improved, but counter-electromotive force degrades the power applied to specific patterns
Solution Approach 1:
The control circuit activates different conductive patterns in a periodic or sequential manner based on charging position detection. By switching between patterns rather than maintaining simultaneous activation, the system supports various charging positions while preventing counter-electromotive force interference that would degrade power delivery to active patterns.
Solution Approach 2:
The control circuit preemptively deactivates unused conductive patterns before power is applied to the active pattern. This preliminary action prevents counter-electromotive force from inactive patterns from interfering with power delivery to the currently active pattern, ensuring sufficient and reliable power application.
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 ensures efficient power delivery to the intended conductive pattern by minimizing power leakage and signal degradation, ensuring sufficient voltage and current are applied as required.
Implementation Method 1
The transmitting end generates a magnetic field, and the receiving end induces or resonates a current according to a change in the magnetic field thereby generating energy.
Implementation Method 2
power is transmitted wirelessly by using a conductive pattern... The wireless power transmitting apparatus may include multiple conductive patterns in order to improve the degree of freedom of the charging position.
Implementation Method 3
Each bridge circuit may include multiple switches such as, for example, multiple field effect transistors (FETs). Respective output ends of the multiple conductive patterns may be connected to each other.
Data Source
AI summary
A wireless power transmission apparatus according to various embodiments of the present invention may comprise: a power provision circuit for providing direct current (DC) power; a first conductive pattern; a second conductive pattern; multiple first switches connected to one end of the first conductive pattern and one end of the second conductive pattern; multiple second switches connected to the other end of the first conductive pattern; multiple third switches connected to the other end of the second conductive pattern; and a control circuit, wherein the control circuit controls the multiple first switches and the multiple second switches to convert the DC power into first alternating current (AC) power and apply the first AC power to the first conductive pattern and control the multiple first switches and the multiple third switches to convert the DC power into second AC power and apply the second AC power to the second conductive pattern. Various other embodiments are possible.