Voltage Multiplication in Wireless Receiver Coils
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Solution Overview
Problem
Wireless energy transfer systems face challenges in maintaining minimum operational voltage at the load due to decreases in magnetic field intensity and coupling between inductors, leading to inefficient energy transfer, and existing solutions focus on increasing these parameters rather than addressing voltage requirements at the receiver.
Innovation Solution
Incorporating a voltage multiplication component in the receiver, which can adaptively enable or disable voltage multiplication based on the load's voltage needs, using circuit topologies like Villard, Greinacher, and Delon voltage doublers, and synchronous rectification circuits to increase the voltage to the load, allowing for reduced magnetic field intensity and coupling requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If magnetic field intensity is decreased or coupling between inductors is decreased, then transmitter power and coil size are reduced, but DC voltage drops below minimum operational voltage
Solution Approach 1:
Instead of increasing magnetic field intensity or coupling to maintain voltage, the patent inverts the approach by using a voltage multiplier at the receiver side to step up the voltage after induction, allowing the transmitter to operate at lower power while still delivering sufficient voltage to the load
Solution Approach 2:
The patent changes the voltage parameter through multiplication by using a voltage multiplier circuit (such as a Cockcroft-Walton multiplier or transformer-based multiplier) that increases the induced AC voltage to meet the minimum operational voltage requirement, decoupling the transmitter power level from the receiver voltage level
2Reliability
If voltage multiplication is always enabled, then load voltage requirements are met, but voltage stress on receiver components increases
Solution Approach 1:
The patent implements dynamic control of the voltage multiplier by using a controller that monitors the induced voltage level and adaptively enables or disables the voltage multiplication function, ensuring voltage multiplication is only activated when the induced voltage falls below the minimum operational threshold, thereby minimizing unnecessary voltage stress on components
3Reliability
If magnetic field intensity is increased to maintain voltage, then operational voltage is maintained, but system cost and complexity increase
Solution Approach 1:
The patent replaces the mechanical/approach of increasing magnetic field intensity (which would require larger coils, more turns, or higher current) with an electrical solution - a voltage multiplier circuit that achieves the same voltage boosting effect through electronic means, reducing the complexity of the magnetic coupling system
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 efficient energy transfer by maintaining sufficient voltage to the load even with lower magnetic field intensity and coupling, allowing for cost-effective and flexible system design with reduced transmitter power and coil size, while minimizing voltage stress on receiver components.
Implementation Method 1
Energy transfer between two coupled inductors may occur through the use of a transmitter generating an oscillating magnetic field and a receiver converting the oscillating magnetic field into electric power
Data Source
AI summary
A wireless energy transfer receiver includes an input configured to receive alternating current (AC) electric energy and an output configured to make available direct current (DC) electric energy. The receiver further includes a rectification component configured to convert the AC energy received at the input into DC energy available at the output, the DC energy made available as DC voltage; and a multiplication component configured to amplify a peak voltage of the AC energy received at the input, the DC voltage made available at the output correspondingly being higher than the peak voltage of the AC energy received at the input.