Wireless Power Receiver Phase Control for Efficiency
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Solution Overview
Problem
Conventional contactless power receiving apparatuses do not allow for adjustment of electric power received by the resonance element, leading to inefficient power transmission between power transmitters and receivers, resulting in unbalanced power distribution to multiple electronic devices.
Innovation Solution
A power receiver system that includes a secondary-side resonant coil, a capacitor, a series circuit with switches, and rectifiers, along with a controller that adjusts the phases of switching signals to optimize power reception, allowing for adjustment of the received electric power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional contactless power receiving apparatus is used without power adjustment, then power transmission can be implemented, but power transmission efficiency is poor and power distribution is unbalanced
Solution Approach 1:
The patent applies dynamics by making the power reception system adjustable through phase control of switching signals. The power receiver can dynamically change its power reception characteristics by adjusting the phase of switching signals applied to the resonant coil, enabling adaptive optimization of power transmission efficiency for different transmission distances and loads.
Solution Approach 2:
The patent changes the phase parameter of switching signals to control power reception. By varying the phase angle of the switching signals applied to the resonant coil, the system can adjust the amount of power received from the transmitter, thereby optimizing transmission efficiency and enabling balanced power distribution to multiple devices.
2Loss of energy
If power adjustment is added to contactless power receiving apparatus, then power transmission efficiency improves, but device complexity increases
Solution Approach 1:
The patent achieves multi-functionality by integrating power reception, phase control, and power adjustment capabilities into a single power receiver unit. The same resonant coil and switching circuitry used for power reception are also employed for phase control, allowing the system to perform both power transfer and power adjustment functions without requiring completely separate control hardware.
Solution Approach 2:
The patent uses parameter changes (phase angle adjustment) as a control mechanism that can be implemented through relatively simple signal processing. By controlling the phase of switching signals rather than requiring complex mechanical or electrical adjustments, the system achieves power regulation with moderate circuit complexity.
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 enables efficient and balanced power transmission to multiple electronic devices by adjusting the phases of the switching signals, improving the efficiency of electric power reception and reducing power imbalances.
Implementation Method 1
a secondary-side resonant coil including a resonant coil part and configured to receive electric power from a primary-side resonant coil through magnetic field resonance generated between the primary-side resonant coil and the secondary-side resonant coil
Implementation Method 2
a series circuit, coupled in parallel with the capacitor, of a first switch and a second switch; a first rectifier coupled in parallel with the first switch, the first rectifier having a first rectification direction; a second rectifier coupled in parallel with the second switch, the second rectifier having a second rectification direction opposite to the first rectification direction; a controller configured to adjust phases of a first signal for switching on/off the first switch and of a second signal for switching on/off the second switch
Data Source
AI summary
A power receiver includes: a secondary-side resonant coil configured to receive electric power from a primary-side resonant coil through magnetic field resonance generated; a capacitor inserted in series in a resonant coil part of the secondary-side resonant coil; a series circuit, coupled in parallel with the capacitor, of a first switch and a second switch; a first rectifier coupled in parallel with the first switch, the first rectifier having a first rectification direction; a second rectifier coupled in parallel with the second switch and having a second rectification direction; a detector configured to detect the electric power received by the secondary-side resonant coil; and a controller configured to adjust phases of a first signal for switching on/off the first switch and of a second signal for switching on/off the second switch to adjust an amount of the electric power received by the secondary-side resonant coil.