Inductive Charging Coil with Integrated Resonance Capacitor
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Solution Overview
Problem
Existing inductive charging systems for electric vehicles require separate resonance capacitors that occupy installation space and necessitate cable connections, which complicate installation and increase requirements for current carrying capacity, insulation, and screening.
Innovation Solution
Integrating resonance capacitors directly with the primary or secondary coils by designing them to surround or be surrounded by the coils, eliminating the need for external cable connections and allowing for a compact, efficient design with a common housing and screening elements to manage magnetic fields.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If resonance capacitors are separately accommodated in electronic units, then electrical functionality is maintained, but installation space increases and cable connections are required
Solution Approach 1:
The patent integrates the resonance capacitor directly into the coil structure, merging two previously separate components (coil and capacitor) into a single unified assembly. This eliminates the need for separate accommodation in electronic units and removes cable connections between them, thereby reducing installation space and simplifying the device structure.
Solution Approach 2:
The resonance capacitor is designed to be disposed within or around the coil structure, with the capacitor potentially nested inside the coil winding or positioned in a recess of the coil assembly. This nesting arrangement allows the capacitor to occupy space within the existing coil volume rather than requiring additional external space, thus reducing overall installation footprint.
2Device complexity
If resonance capacitors are integrated with coils, then installation space is reduced and cable connections are eliminated, but manufacturing complexity increases
Solution Approach 1:
The resonance capacitor is pre-formed with a specific geometric shape that matches the required integration configuration before being assembled with the coil. This preliminary shaping of the capacitor allows for easier integration into the coil structure, reducing the complexity of the assembly process while maintaining the space-saving benefits of integration.
3Volume of moving object
If resonance capacitors are disposed compactly with coils, then installation space is reduced, but vibration behavior may be affected
Solution Approach 1:
The integration of the resonance capacitor with the coil is designed with consideration for local structural properties that affect vibration behavior. The capacitor's position and mounting within the coil assembly are optimized to minimize vibration transmission and maintain structural stability, ensuring that the compact integration does not compromise the mechanical properties of the charging device.
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 reduces installation space, eliminates cable-related issues, enhances vibration behavior, and lowers costs by integrating capacitors with coils, while effectively managing magnetic fields and reducing stray interference.
Implementation Method 1
the primary coil generates a high frequency, magnetic alternating field, which penetrates the secondary coil and induces a corresponding current there
Implementation Method 2
Both oscillating circuits are set to the same resonance frequency and operated with the same, so that only negligible reactive powers accrue outside of the transmission network formed in this manner
Data Source
AI summary
The invention relates to a device (1) for inductively charging an electrical storage unit, in particular of a motor vehicle, comprising a stationary primary coil (2) and a secondary coil that is or can be associated with the motor vehicle, wherein at least one resonance capacitor (7) is associated with the primary coil (2) and the secondary coil, respectively. According to the invention, at least one of the resonance capacitors (7) is designed to at least substantially surround the coil (2) in question or to at least substantially be surrounded by the coil (2) in question.