Wireless Power Hybrid Duty Cycle Frequency Control
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Solution Overview
Problem
Existing wireless power systems face limitations in accurately adjusting power delivery due to resolution issues in frequency mode control and duty cycle mode control, particularly in maintaining resonance and delivering low power loads, which can be affected by manufacturing tolerances and environmental changes.
Innovation Solution
A wireless power system that employs a hybrid approach by adjusting both the duty cycle and frequency of a switching control signal to achieve desired power levels, using a drive controller that sets duty cycle to preset values when adjustments exceed predefined ranges to maintain operational stability and flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If frequency mode control is used to adjust power delivery, then power control capability is improved, but resolution of frequency output is limited and adjustment becomes coarse at higher frequencies
Solution Approach 1:
The patent combines frequency mode control and duty cycle mode control into a unified hybrid control system. The controller selectively applies frequency adjustment when the operating point is near resonance and duty cycle adjustment when operating away from resonance, merging the advantages of both methods to achieve both high resolution and wide power control range.
Solution Approach 2:
The control method dynamically switches between frequency mode and duty cycle mode based on the operating conditions (proximity to resonant frequency). This dynamic adaptation allows the system to optimize control resolution at each operating point, using frequency control near resonance where it provides fine resolution and duty cycle control away from resonance where it maintains adequate resolution across broader power ranges.
2Power
If duty cycle control is used to maximize output range, then output resolution is improved, but the system cannot deliver low power loads due to lower duty cycle limits and resonance shifts
Solution Approach 1:
The system dynamically selects the appropriate control mode based on the desired power level and proximity to resonant frequency. For low power loads, the controller uses frequency mode control when near resonance to achieve fine power adjustment below the minimum effective duty cycle threshold, ensuring reliable low power delivery while maintaining the ability to deliver full power range using duty cycle control when appropriate.
3Power
If the system operates close to resonance to maximize duty cycle output range, then power delivery range is improved, but resonance shifts due to manufacturing tolerances or environmental changes make high power levels unattainable
Solution Approach 1:
The controller continuously monitors the operating conditions and resonant frequency, using feedback to dynamically adjust the control strategy. When resonance shifts occur due to manufacturing tolerances or environmental changes, the system detects the shift and adapts by switching between frequency and duty cycle control modes appropriately, maintaining the ability to deliver high power levels despite resonance frequency variations.
4Productivity
If frequency is increased to improve power delivery speed, then productivity is improved, but resolution of frequency adjustment decreases making accurate power control difficult
Solution Approach 1:
The patent changes the control parameter from frequency to duty cycle when operating away from resonance. By switching to duty cycle control, the system maintains high frequency operation (improving productivity) while using duty cycle adjustment to achieve fine power control resolution, effectively decoupling the frequency setting from the power adjustment resolution requirement.
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 hybrid approach enhances power delivery resolution, maintains operational stability across varying conditions, and allows for a wider range of power adjustments, overcoming limitations of traditional frequency and duty cycle control methods.
Implementation Method 1
a transmitting circuit that includes an inductor configured to generate a magnetic field to provide power to a receiver
Data Source
AI summary
A wireless power system and method are provided that employ a hybrid approach to adjusting transmission power to take advantages of the best features of frequency mode adjusting and duty cycle mode adjusting. The wireless system and method attempt to modify duty cycle as a first adjustment, unless the duty cycle adjustment causes the duty cycle to be outside a predefined range. If the duty cycle adjustment causes the duty cycle to be outside a predefined range, the wireless system and method employ frequency mode adjusting to adjust transmission power.