Quantized Waveform Coil Drive for Harmonic-Free Wireless Power
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Solution Overview
Problem
Conventional medical devices face challenges in efficiently transferring power wirelessly due to harmonic emissions from the power transmission coil, which can interfere with nearby radio receivers and limit the selectivity and linearity of the receiver systems.
Innovation Solution
A wireless power transmitter unit is developed, featuring a resonant tank circuit and a quantized waveform generator that drives a transmit coil with predefined pulse sequences, eliminating or reducing specific harmonic emissions by generating a quantized waveform with discrete levels approximating a biphasic or sinusoidal shape, thereby minimizing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional power transmission is used, then power can be transmitted wirelessly to medical devices, but harmonic emissions interfere with nearby radio receivers
Solution Approach 1:
The power transmission waveform is segmented into multiple discrete quantized levels instead of continuous transmission. The waveform is divided into N distinct voltage levels, where each level corresponds to a specific amplitude state. This segmentation allows selective elimination of harmonic components while maintaining power transmission functionality.
Solution Approach 2:
The waveform parameters are changed from conventional continuous sine wave to quantized multi-level waveform. By adjusting the quantization levels and pulse widths, the harmonic content of the transmitted signal is modified to eliminate interference with radio receivers while maintaining efficient power transfer.
2Object-affected harmful factors
If quantized waveform is used to eliminate harmonic emissions, then interference with radio receivers is reduced, but waveform complexity increases
Solution Approach 1:
The quantized waveform is generated using periodic pulse sequences with specific duty cycles and timing relationships. The waveform repeats at the fundamental frequency while maintaining quantized levels, allowing systematic control of harmonic content through periodic modulation patterns.
Solution Approach 2:
A quantized waveform generator circuit serves as an intermediary between the power source and the transmit coil. This intermediate stage converts conventional power signals into quantized waveforms with controlled harmonic content, simplifying the overall system by handling waveform complexity in a dedicated module.
3Object-affected harmful factors
If multiple amplifiers are used to generate quantized waveform, then harmonic emissions are eliminated, but device complexity increases
Solution Approach 1:
The amplifier function is segmented into multiple independent amplifiers, each handling a specific quantized level or time interval. This segmentation allows each amplifier to operate in a simplified manner while collectively producing the complex quantized waveform needed for harmonic elimination.
Solution Approach 2:
Multiple amplifier outputs are merged or combined to produce the final quantized waveform. By synchronizing the outputs of multiple amplifiers with specific pulse sequences, the system achieves harmonic elimination through constructive and destructive interference of frequency components.
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 effectively reduces or eliminates selected harmonic emissions, ensuring compatibility with nearby radio receivers and enhancing the reliability of power transfer in medical devices like cochlear implants, while maintaining efficient power transmission.
Implementation Method 1
a resonant tank circuit
Implementation Method 2
inductive power transmission
Data Source
AI summary
Presented herein are techniques for wirelessly transferring power signals (power) through the use of a quantized wave-shaped signal, referred to herein as “quantized waveform.” In particular, a quantized waveform generator comprises a pulse generator and a set of amplifiers that are grouped over a distributed resonance capacitor part of a series resonant tank circuit. These amplifiers are driven in a predefined sequence of pulses in order to generate a step function output (quantized waveform). The quantized waveform is used to drive a power transmission coil to cause the power transmission coil to emit wireless power signals at a predetermined operating frequency. The predefined sequence used to drive the amplifiers is such that one or more harmonic components of the operating frequency are substantially eliminated.