Self-regulated Reconfigurable Resonant Voltage Mode Inductive Power Transmission
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Solution Overview
Problem
Inductive power transmission systems face challenges in achieving sufficient voltage delivery at large distances and with misaligned coils, leading to inefficiencies in power conversion and transmission efficiency, particularly due to limitations in voltage conversion efficiency and dynamic load matching.
Innovation Solution
A current-based resonant power delivery device and method that utilizes a switch to alternate between states for energy transfer, allowing the receiver coil and resonance capacitor to function as a current source, enabling high voltage conversion efficiency and adaptive power management between voltage and current modes based on voltage across the receiver coil and load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the PA voltage is increased to achieve sufficient load voltage at large distances, then the load voltage is improved, but the power transmission efficiency deteriorates due to safety limits and regulatory requirements
Solution Approach 1:
The patent changes the operating parameters of the resonant circuit by dynamically adjusting the switching frequency of the power switch. This allows the system to operate at optimal frequencies that maximize voltage transformation ratio while maintaining acceptable efficiency, resolving the contradiction between achieving sufficient load voltage and maintaining power transmission efficiency.
Solution Approach 2:
The patent implements dynamic control of the power transmission system by continuously monitoring the coupling conditions and adjusting the switch frequency in real-time. This dynamic adaptation allows the system to maintain high efficiency across varying distances and alignment conditions while still delivering sufficient voltage to the load.
2Loss of energy
If additional coils are added to provide load matching, then the power transmission efficiency is improved, but the device complexity increases
Solution Approach 1:
The patent makes the existing receiver coil perform multiple functions: it serves as both the power reception element and the load matching element through dynamic impedance transformation. By controlling the switch frequency and duty cycle, the system achieves load matching without requiring additional coils, thus improving efficiency while avoiding increased device complexity.
Solution Approach 2:
The patent enables the receiver circuit to automatically adjust its input impedance to match the optimal load condition by dynamically controlling the power switch. This self-adjusting mechanism eliminates the need for external load matching networks or additional coils, resolving the contradiction between efficiency improvement and system complexity.
3Loss of energy
If off-chip matching circuits are used to transform load resistance, then the power transmission efficiency is improved, but the device complexity and power loss increase due to additional components
Solution Approach 1:
The patent extracts the load matching function from external off-chip circuits and integrates it into the on-chip power management circuitry. By using the power switch and resonant capacitor to provide dynamic impedance transformation, the system achieves load matching without requiring external matching networks, thereby improving efficiency while reducing device complexity and eliminating additional power losses.
4Volume of moving object
If the receiver coil is miniaturized to reduce size, then the device compactness is improved, but the load voltage and power transmission efficiency deteriorate at large distances
Solution Approach 1:
The patent compensates for the reduced coupling coefficient of miniaturized coils by changing the operating parameters of the resonant circuit. By dynamically adjusting the switch frequency and duty cycle, the system maximizes the voltage transformation ratio, allowing miniaturized receiver coils to still achieve sufficient load voltage and maintain acceptable power transmission efficiency.
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 solution achieves high voltage conversion efficiency and improved power transmission efficiency by dynamically adjusting switching frequencies and modes, extending the range of inductive power transmission and optimizing power delivery for varying load conditions.
Implementation Method 1
a transmitter coil, a receiver circuit, the receiver circuit having a receiver coil... The transmitter coil is configured to energize the receiver coil
Implementation Method 2
the receiver circuit having a receiver coil, a resonance capacitor... The receiver circuit is configured to build up and transfer energy between the receiver coil and the resonance capacitor
Data Source
AI summary
A current-based resonant power delivery (CRPD) device and method with multi-cycle switching that enables efficient inductive power transmission at large distances. The proposed CRPD switches the Rx LC-tank for several cycles to utilize it as a current source. Therefore, the voltage across the load (RL) can be significantly higher than the Rx LC-tank voltage. In CRPD, the energy may first be stored in the receiver (Rx) coil by shorting the Rx LC-tank for several power carrier cycles. At the peak of Rx coil current, the coil energy may then be transferred to load (RL) for a quarter of the power carrier cycle.