Wireless Power Receiver Capacitor Heat Sink Design
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Solution Overview
Problem
In wireless power feeding systems using the magnetic field resonance type, the rectification circuit generates significant heat when converting AC power to DC power, especially when handling large power levels, which is not effectively managed.
Innovation Solution
The wireless power receiver incorporates a capacitor with flat plate electrodes that functions as a heat sink, allowing heat generated from the heating element, such as the rectification circuit or load, to be easily radiated, and the coils are wound outside the capacitor to maintain a compact size, with protrusions on the electrodes increasing the surface area for enhanced heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a rectification circuit is used to convert AC power to DC power in a wireless power feeding system, then DC power can be supplied to the load, but significant heat is generated that is not effectively managed
Solution Approach 1:
The patent combines the capacitor from the receiving coil circuit with the heat sink function by placing the heating element (rectification circuit or load) directly on one of the capacitor's electrodes. This merging allows the capacitor to serve dual purposes: electrical energy storage and heat dissipation, effectively managing the heat generated during power conversion without requiring a separate heat sink structure.
Solution Approach 2:
The capacitor electrode is designed to perform multiple functions simultaneously: it serves as an electrical component for power reception and storage, and as a thermal management component (heat sink) for dissipating heat from the rectification circuit or load. This multi-functionality resolves the contradiction by integrating heat management into the existing power conversion infrastructure.
2Temperature
If heat dissipation structures are added to manage heat from the rectification circuit, then heat management improves, but the system complexity and size increase
Solution Approach 1:
Instead of adding a separate heat dissipation structure, the patent merges the heat sink function into the existing capacitor by placing the heating element directly on the electrode. This eliminates the need for additional heat dissipation components and reduces system complexity while effectively managing heat.
Solution Approach 2:
The capacitor electrode serves dual purposes as both an electrical component and a heat sink, eliminating the need for separate heat management structures. This multi-functionality reduces system complexity and maintains a compact design while effectively dissipating heat.
3Temperature
If the capacitor size is increased to improve heat dissipation, then heat management improves, but the overall device size increases
Solution Approach 1:
The patent combines the heat dissipation function with the existing capacitor structure by placing the heating element on the electrode. This approach utilizes the capacitor's existing volume and surface area for heat dissipation without requiring additional space, thus improving heat management while maintaining compact device dimensions.
Solution Approach 2:
The capacitor electrode performs dual functions as an electrical component and a heat sink, maximizing the utilization of existing device volume. This eliminates the need for additional heat dissipation structures that would increase device size, effectively managing heat within the existing form factor.
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 effectively radiates heat generated from the power receiving side circuit with a simple mechanism, improving heat management and maintaining high power transmission efficiency even during large power handling.
Implementation Method 1
receives, at a receiving coil, AC power fed from a feeding coil by wireless using a magnetic field resonance phenomenon between the feeding coil and receiving coil
Implementation Method 2
When AC power is fed to the exciting coil, current also flows in the feeding coil according to the principle of electromagnetic induction
Implementation Method 3
A heating element included in the loading circuit is placed on one of the electrodes. Placing the heating element of the loading circuit on one of the electrodes of the capacitor allows heat generated from the heating element to easily escape to the electrode
Implementation Method 4
The capacitor is made to function as a heat sink, so that it is possible to achieve effective heat radiation with a simple mechanism
Data Source
AI summary
Power is fed from a feeding coil to a receiving coil L3 by magnetic resonance. The receiving coil L3 and a capacitor C3 are connected in series to constitute a receiving coil circuit. A loading coil L4 electromagnetically coupled to the receiving coil L3 is connected to a load through a rectification circuit 142 to constitute a loading circuit. Placing the rectification circuit 142 on a first flat plate electrode 132 of the capacitor C3 allows heat generated from the rectification circuit 142 to escape to the first flat plate electrode 132.