Primary Side Detection for Inductive Power Transfer Control
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Solution Overview
Problem
Inductive power transfer systems face delays in responding to errors at the receiving side due to slow communication and increased complexity and costs associated with existing short circuit protection methods, which can lead to dangerous voltage levels and hardware damage.
Innovation Solution
A method that measures and analyzes electric variables at the primary side to detect operating conditions at the secondary side without requiring measurement data from the secondary side, allowing for intrinsic detection and control of the system without wireless communication links or dedicated short circuit protection switches.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wireless communication link is used to detect errors at the receiving side, then error detection capability is improved, but response time is delayed and system complexity increases
Solution Approach 1:
The patent uses the magnetic field as an intermediary carrier to transmit error detection information from the receiving side to the transmitting side. Instead of using wireless communication protocols, the system modulates error signals onto the magnetic field itself, allowing immediate detection at the transmitting side without communication delays.
Solution Approach 2:
The patent replaces the wireless communication link (electromagnetic signal transmission protocol) with direct magnetic field coupling for error signal transmission. This substitution eliminates the need for complex communication protocols and enables real-time error detection through the existing inductive coupling mechanism.
2Reliability
If short circuit protection switch is added at the receiving side, then hardware protection is improved, but device complexity and cost increase
Solution Approach 1:
The patent extracts the error detection and protection functions from the receiving side hardware and relocates them to the transmitting side. By monitoring magnetic field changes at the transmitting side, the system can detect receiving side errors and control the transmitter to prevent damage, eliminating the need for dedicated protection switches at the receiver.
Solution Approach 2:
The patent makes the transmitting side controller multi-functional by enabling it to both transmit power and detect receiving side errors through magnetic field monitoring. This universal approach combines power transmission and error detection functions in one component, reducing overall system complexity.
3Measurement precision
If measurement data from secondary side is used for detection, then detection accuracy is improved, but system complexity and implementation cost increase
Solution Approach 1:
The patent inverts the traditional detection approach by not directly measuring variables at the receiving side. Instead, it infers receiving side conditions by monitoring magnetic field changes at the transmitting side, reversing the direction of measurement while maintaining detection accuracy.
Solution Approach 2:
The system uses the existing magnetic field, which is already present and necessary for power transmission, to carry error detection information. This self-service approach means the same electromagnetic coupling used for power transfer also provides error detection capability, eliminating the need for separate measurement systems.
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 faster and more efficient detection of operating conditions, reducing the risk of hardware damage and system complexity while lowering implementation costs by using primary side signals to control the inductive power transfer system and maintain a safe state at the secondary side.
Implementation Method 1
the transmitter coil 108, when placed in the magnetic field produced by the transmitter coil 108, receives energy transmitted by the transmitter coil 108 through inductive coupling
Implementation Method 2
the receiver coil 110, when placed in the magnetic field produced by the transmitter coil 108, receives energy transmitted by the transmitter coil 108 through inductive coupling. The inductive coupling leads to the generation of a receiving side AC signal
Data Source
AI summary
A more efficient solution for a detection of operating conditions in an inductive power transfer system and for improved control of the inductive power transfer system. An operating condition at a secondary side of an inductive power transfer system is detected by measuring at least one electric variable at a primary side of the inductive power transfer system which is dynamically coupled to the operating condition at the secondary side of the inductive power transfer system. Then follows an analysis of the at least one electric variable over time at the primary side of the inductive power transfer system. This allows to detect a change of the operating condition at the secondary side of the inductive power transfer system. Also provided is a control method and related controller apparatus using the detection method.