Inductive Power Transfer Frequency Modulation for Stable Voltage
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Solution Overview
Problem
Existing inductive power transmission systems face challenges in maintaining stable output voltage across a wide operating range, requiring continuous regulation to ensure efficient power delivery to electrical devices.
Innovation Solution
The system employs an inductive power transfer system with a frequency modulator that adjusts the natural frequency of the inductive couple by modifying magnetic permeability or dimensions of inductors and capacitors, using components like piezoelectric elements and variable DC supplies, to regulate power delivery to electrical loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If feedback control is used to regulate output voltage, then stable operating voltage is maintained, but regulation over a wide operating range becomes difficult
Solution Approach 1:
The patent applies dynamics by making the natural frequency of the inductive couple adjustable through frequency modulators. The system transitions from a fixed-frequency design to a dynamic one where the resonant frequency can be continuously adjusted to match different operating conditions, enabling both stable voltage regulation and adaptability across wide operating ranges
Solution Approach 2:
The patent changes the parameter of natural frequency from a fixed value to a variable parameter that can be dynamically adjusted. By modifying the resonant frequency of the inductive couple through frequency modulators, the system adapts to different load conditions and operating ranges while maintaining stable voltage output
2Reliability
If transmission frequency is kept significantly different from natural frequency, then power transmission stability is improved, but power transfer efficiency decreases
Solution Approach 1:
The system dynamically adjusts the natural frequency to maintain optimal operating conditions. By making the resonant frequency adjustable, the system can operate at frequencies that maximize power transfer efficiency while maintaining stability through controlled frequency differences
Solution Approach 2:
The patent employs feedback control where the system monitors power transfer conditions and adjusts the natural frequency accordingly. This feedback mechanism allows the system to maintain the optimal frequency difference for stability while minimizing energy loss by adapting to changing load conditions
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 approach enables continuous regulation of power over a wide range, ensuring stable voltage supply to electrical devices by dynamically adjusting the natural frequency of the inductive couple, thereby improving power transfer efficiency and adaptability.
Implementation Method 1
the frequency modulator comprises at least one frequency modulation coil operable to modify magnetic permeability of at least one magnetic flux guide
Implementation Method 2
An oscillating electrical potential, or driving voltage, is applied across a primary inductor associated with the inductive power outlet. This produces a varying magnetic field in the vicinity of the primary inductor
Implementation Method 3
When the inductive receiver is brought near to the inductive outlet, a secondary potential difference, or output voltage, is generated across a secondary inductor positioned within this varying magnetic field
Implementation Method 4
the dimension modifier comprises a piezoelectric element wired to a variable DC supply
Data Source
AI summary
An inductive power transfer system is provided that includes at least one inductive power receiver having at least one secondary inductor for forming an inductive couple with a primary inductor and providing power to an electric load and at least one inductive power outlet having at least one primary inductor wired to a power supply via a driver configured to provide a driving voltage across the primary inductor. The driving voltage is oscillating at a transmission frequency significantly different from the natural frequency of the inductive couple. The system further includes at least one power monitor and at least one frequency modulator operable to adjust the natural frequency of the inductive couple thereby regulating power provided to the electric load.