Wireless Power Communication Slot Timing Around Zero Crossings
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wireless power systems face challenges in coordinating communication slots with zero-cross instances of the AC main power signal, leading to inefficiencies and interference, as previous techniques often depend on the frequency and amplitude of the AC main power signal for slot width determination.
Innovation Solution
Implementing a phase-locked loop (PLL) to determine the timing of zero-cross instances and calculating the start time of communication slots such that approximately half of the slot duration occurs before the zero-cross instance, allowing for communication slots to be centered on these instances, independent of the AC main power signal's characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If communication slots are coordinated with zero-cross instances of the AC main power signal, then interference with wireless power signal is minimized, but device complexity increases due to timing coordination requirements
Solution Approach 1:
The system determines the timing of future zero-cross instances in advance and calculates the start time for communication slots based on these predetermined timing references. This preliminary determination of timing coordinates communication slots with zero-cross instances before actual power transfer begins, minimizing interference while managing complexity through advance planning
Solution Approach 2:
The system utilizes the periodic nature of the AC main power signal to establish regular intervals for zero-cross instances. Communication slots are positioned at these periodic intervals, allowing the system to leverage the inherent periodicity of the power signal to minimize interference without requiring complex real-time coordination mechanisms
2Reliability
If communication slot width is determined based on frequency and amplitude of AC main power signal, then communication reliability is maintained, but adaptability to frequency variations is reduced
Solution Approach 1:
The system dynamically adjusts communication slot timing based on detected frequency variations in the AC main power signal. By using the phase-locked loop to track zero-cross instances in real-time and calculating start times based on current frequency conditions, the system adapts communication slot positions to maintain reliable communication while accommodating frequency variations
Solution Approach 2:
The system changes the timing parameters of communication slots in response to detected frequency variations. By calculating start times based on actual zero-cross instance timing rather than fixed schedules, the system modifies communication parameters dynamically to maintain reliability across varying operating conditions
3Productivity
If communication slots are positioned to minimize interference, then power transfer efficiency is improved, but communication time may be reduced
Solution Approach 1:
The system positions communication slots to partially overlap with zero-cross instances where the wireless power signal has minimal voltage. By utilizing this partial overlap period where interference is naturally minimized, the system achieves both efficient power transfer during non-overlapping periods and reliable communication during overlapping periods without significant loss of communication time
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 adjusts to frequency variations in the AC main power signal, minimizing interference during efficient power transfer periods and allowing for flexible communication slot widths, thereby enhancing communication reliability and power transfer efficiency.
Implementation Method 1
Inductive coupling can enable wireless power transfer between a primary coil of the Power Transmitter and a secondary coil of the Power Receiver. The primary coil of the Power Transmitter produces an electromagnetic field during a power state of the wireless power system. The electromagnetic field induces a voltage in the secondary coil of the Power Receiver
Data Source
AI summary
This disclosure provides systems, methods and apparatuses for a managing timing of communication slots in a wireless power system. The communication slots are centered on zero-cross instances. The Power Transmitter and/or Power Receiver can use a phase locked loop (PLL) to determine the timing of the zero-cross instances. The wireless power system can determine when to begin a communication slot based on the timing of the zero-cross instance and the slot width. For example, the beginning of the communication slot can begin at a time that is half the slot width before the time of the zero-cross instance.