Inductive Power Transfer Receiver Frequency Hopping
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Solution Overview
Problem
Inductive power transfer systems experience significant power losses when the receiver operates at a frequency substantially different from the transmitter frequency, particularly in high Q resonant situations, leading to inefficiencies in power transfer.
Innovation Solution
The method involves a receiver controller that dynamically adjusts its operating frequency to match or alternate around the transmitter frequency, sensing power transfer at different frequencies to maintain a threshold difference, thereby optimizing power transfer and compensating for variations in load, environmental, and coupling conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the receiver operates at a frequency substantially different from the transmitter frequency, then the system can tolerate frequency variations and environmental changes, but significant power losses occur particularly in high Q resonant situations
Solution Approach 1:
The receiver frequency is made dynamic by continuously adjusting it to track the transmitter frequency. The system transitions from a static frequency operation to a dynamic tracking mode where the receiver frequency adapts in real-time to match the transmitter frequency, thereby maintaining optimal power transfer efficiency while tolerating frequency variations and environmental changes
Solution Approach 2:
The system implements feedback by sensing the transmitter frequency and using this information to adjust the receiver frequency. The controller continuously monitors the transmitter frequency and modifies the receiver frequency accordingly, creating a closed-loop system that eliminates power losses due to frequency mismatch while maintaining adaptability to environmental variations
2Productivity
If the receiver operates at a fixed frequency, then the system is simpler to control, but power transfer efficiency decreases when transmitter frequency varies due to load conditions, environmental conditions, and coupling conditions
Solution Approach 1:
The system uses feedback by sensing the transmitter frequency and adjusting the receiver frequency accordingly. The controller receives feedback about the transmitter frequency from the sensing circuitry and automatically modifies the receiver frequency to maintain optimal power transfer, thereby improving efficiency without requiring complex manual intervention
Solution Approach 2:
The system performs self-adjustment by automatically tracking the transmitter frequency without external intervention. The receiver controller autonomously senses the transmitter frequency and adjusts its own operating frequency to match, enabling the system to maintain high power transfer efficiency while adapting to varying load conditions, environmental factors, and coupling 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 enhances power transfer efficiency by minimizing losses and allowing the system to adapt to changing conditions without the inefficiencies associated with traditional regulation methods, enabling high-Q operation without derating and rapid response to power demands.
Implementation Method 1
a first device for transmitting power at a transmit frequency and a second device for receiving power inductively from the first device
Implementation Method 2
The receiver has a receiver winding/coil, and may include a receiver converter which converts the transmitter frequency to DC
Data Source
AI summary
An IPT receiver is controlled to vary its frequency of operation to hop between a first frequency below the transmitter frequency and a second frequency above the transmitter frequency while measuring the power transfer at both first and second frequencies. Embodiments may track variations in transmitter frequency.