Wireless Power Receiver Switching for Voltage Boosting
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Solution Overview
Problem
Medical implant systems require efficient battery charging without frequent battery replacements, and existing wireless power transmission technologies face challenges in efficiently charging batteries with low output voltage.
Innovation Solution
A wireless power transmission system with a receiver that includes an inductor and capacitor configured for resonance, and a switching mechanism to increase current magnitude by connecting and disconnecting components in series and parallel configurations, allowing efficient voltage boosting for low-voltage battery charging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a voltage-mode receiver is used to charge a low-voltage battery, then the voltage matching is improved, but the power transmission efficiency deteriorates due to high RMS current and heat generation
Solution Approach 1:
The patent transforms the receiver operation mode from voltage-mode to current-mode, changing the fundamental operating parameter. The current-mode receiver uses a resonant circuit to generate high-frequency current that directly charges the battery, eliminating the need for voltage matching while reducing RMS current and heat generation, thus improving power transmission efficiency
Solution Approach 2:
The patent employs periodic switching of the resonant circuit to transfer energy in pulses. The resonant circuit is periodically activated to build up current, then disconnected to transfer the stored energy to the battery, creating a pulsed charging mechanism that improves efficiency compared to continuous voltage-mode operation
2Loss of energy
If a current-mode receiver with multi-resonance operation is used, then the power transmission efficiency is improved, but the device complexity increases due to multiple resonant circuits
Solution Approach 1:
The patent divides the power reception process into distinct phases: a resonant charging phase where the resonant circuit builds up current, and a transfer phase where the current is delivered to the battery. This temporal segmentation allows a single resonant circuit to achieve multi-resonance effects without requiring multiple simultaneous resonant circuits, thereby reducing device complexity while maintaining high efficiency
Solution Approach 2:
The patent uses dynamic switching to reconfigure the circuit topology between series and parallel connections of the resonant components. This dynamic reconfiguration allows the same components to serve multiple functions at different times, achieving complex resonance behavior with simpler hardware than would be required for static multi-resonance circuits
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
The system effectively increases the voltage of the resonance circuit, enhancing the efficiency of battery charging for medical implants by reducing RMS current and heat generation, thereby improving power reception efficiency.
Implementation Method 1
an inductor L2 and a capacitor C2 configured to receive power from a transmitter using a resonance
Implementation Method 2
a switching mechanism to increase current magnitude by connecting and disconnecting components in series and parallel configurations
Implementation Method 3
enhancing the efficiency of battery charging for medical implants by reducing RMS current and heat generation
Data Source
AI summary
A receiver of a wireless power transmission system may include a capacitor-and-inductor configured to receive power from a transmitter using a resonance, at least one capacitor configured to connect to an output node of the receiver, and a plurality of switches configured to control current flow within the receiver. The plurality of switches may be controlled so that the capacitor-and-inductor may be disconnected from the at least one capacitor and the output node at preset periods. Current resonating in the capacitor-and-inductor may increase during disconnection between the at least one capacitor and the output node. The plurality of switches may output the increased current to the battery by connecting the capacitor-and-inductor to the capacitor and the output node after the period, connect at least one capacitor and the output node in series after the period, and operate to reduce root mean square (RMS) current within the receiver.