Wireless Power Rectifier Mode Switching for Low Induced Voltage
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Solution Overview
Problem
Wireless power systems face challenges in reducing power dissipation and improving efficiency, particularly due to the limitations of low resistance receiver coils which can diminish the induced voltage on the receiver coil.
Innovation Solution
The implementation of a semiconductor device with a power rectifier and a controller that can selectively switch between a full bridge rectifier mode and a voltage doubler mode, allowing the wireless power receiver to operate efficiently under different conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a low resistance receiver coil is used to reduce power loss, then power dissipation is reduced, but the induced voltage on the receiver coil diminishes
Solution Approach 1:
The system dynamically switches between full bridge rectifier mode and voltage doubler mode based on operating conditions. The controller monitors voltage and current levels, and selectively activates different transistor configurations (HS1, HS2, LS1, LS2) to adapt the rectifier circuit topology, thereby optimizing performance across varying power transfer conditions
Solution Approach 2:
The invention changes the operational parameters of the rectifier circuit by switching between two distinct modes: full bridge rectifier mode for normal operation and voltage doubler mode when induced voltage is insufficient. This parameter change allows the system to maintain efficient power transfer while compensating for low induced voltage conditions
2Productivity
If full bridge rectifier mode is used, then power transfer efficiency is maintained under normal conditions, but power dissipation increases when induced voltage is low
Solution Approach 1:
The controller implements feedback control by monitoring voltage levels across the receiver coil and current levels through the transistors. Based on these measurements, the controller determines when to switch from full bridge rectifier mode to voltage doubler mode, and vice versa, thereby optimizing the balance between power transfer efficiency and power dissipation
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 solution enables the wireless power receiver to optimize power transfer efficiency by switching between modes based on voltage and current measurements, thereby reducing power dissipation and improving overall system efficiency.
Implementation Method 1
the transmission coil and the receiver coil can be inductively coupled with one another to form a transformer that can facilitate inductive transfer of alternating current (AC) power
Implementation Method 2
The power rectifier can be configured to rectify alternating current (AC) power into direct current (DC) power
Data Source
AI summary
Systems and methods for wireless power transfer systems are described. A controller can be coupled to a power rectifier configured to rectify alternating current power into direct current power. The power rectifier can include a first high side transistor, a second high side transistor, a first low side transistor, and a second low side transistor. The controller can be configured to selectively switch on one or more of the first high side transistor, the second high side transistor, the first low side transistor, and the second low side transistor to operate a wireless power receiver under one of a full bridge rectifier mode and a voltage doubler mode.