Wireless Power Inverter Frequency Dispersion Control
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Solution Overview
Problem
Existing wireless power transmission systems face limitations in increasing the frequency change width (frequency dispersion region) while maintaining stable output voltage, leading to restricted noise reduction and output fluctuations.
Innovation Solution
A power transmission device with an inverter, power supply, and power transmission coil, where a voltage changing unit dynamically adjusts the output voltage based on feedback control, allowing the inverter to change its drive frequency to broaden the frequency dispersion region and stabilize output voltage across varying loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If the drive frequency is changed to disperse noise frequency, then the noise dispersion is improved, but the output voltage becomes unstable
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the drive frequency of the inverter within a wide range (e.g., 20-100 kHz) while simultaneously modifying other operating parameters to maintain output stability. The system changes frequency as a primary parameter to disperse noise, while compensating through control mechanisms to preserve voltage stability.
Solution Approach 2:
The patent implements feedback control where the output voltage is continuously monitored and fed back to the control system. This feedback mechanism allows the system to detect voltage deviations caused by frequency changes and automatically adjust control parameters to maintain stable output voltage despite frequency variations.
2Object-generated harmful factors
If the frequency change width is increased to improve noise dispersion, then the noise reduction is improved, but the output voltage fluctuates more
Solution Approach 1:
The patent employs parameter changes by extending the frequency modulation range beyond conventional limits while adjusting duty cycle, pulse width, or other inverter parameters in coordination. This coordinated parameter adjustment allows wide frequency dispersion (improving noise reduction) while compensating for output voltage fluctuations through real-time parameter optimization.
Solution Approach 2:
The system transitions from static frequency operation to dynamic frequency modulation. The drive frequency is continuously or periodically varied within a wide range, and the system dynamically adapts other parameters (such as PWM duty cycle) to maintain output stability despite the increased frequency variation width.
3Object-generated harmful factors
If the drive frequency is changed discretely to disperse noise, then the noise dispersion is improved, but the selectable frequencies are limited
Solution Approach 1:
The patent transitions from discrete frequency switching to continuous or near-continuous frequency modulation. The inverter can operate at any frequency within a wide continuous range rather than being restricted to predetermined discrete frequencies, greatly enhancing adaptability while effectively dispersing noise across a broader spectrum.
Solution Approach 2:
The system implements continuous parameter changes in the drive frequency, allowing smooth adjustment across a wide frequency spectrum. This continuous parameter variation approach replaces discrete frequency steps, enabling versatile frequency selection and optimal noise dispersion without being constrained to fixed frequency points.
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 increases the frequency change width, thereby enhancing noise dispersion and maintaining output stability, even under heavy or light load conditions, improving overall noise reduction and system performance.
Implementation Method 1
a power transmission coil configured to be supplied with the alternating current voltage and generate an alternating current magnetic field
Data Source
AI summary
A power transmission device which can increase a frequency change width (frequency dispersion region) while curbing output fluctuations. The power transmission device that wirelessly transmits power to a power receiving device includes an inverter configured to convert a voltage into an alternating current voltage with a drive frequency, a power supply configured to generate the voltage to be supplied to the inverter, a power transmission coil configured to be supplied with the alternating current voltage and generate an alternating current magnetic field, and a voltage changing unit configured to spontaneously change an output voltage of the power supply, wherein the inverter is configured to control the drive frequency in response to a change in the output voltage.