Wireless Power Resonant Circuit Fault Checks Across Operating States
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Solution Overview
Problem
Existing wireless power supply systems fail to detect faults early, leading to inconvenient power reception failures.
Innovation Solution
A wireless power supply apparatus with a power transmission resonant circuit, alternating-current power supply, switching circuit, and a unit-control unit that performs abnormality determination processes using detection values in resonant and non-resonant states to identify faults.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If abnormality determination is performed only in the resonant state, then the determination process is simple, but fault detection capability is insufficient and faults cannot be detected early
Solution Approach 1:
The system performs abnormality determination in the non-resonant state before entering the resonant state for power transmission. This preliminary check allows faults to be detected early before they affect power supply operations, enabling preventive maintenance and avoiding inconvenient power reception failures.
Solution Approach 2:
The system performs abnormality determination at multiple periodic intervals: first in the non-resonant state before power transmission begins, and again in the resonant state during power transmission. This multi-stage periodic detection ensures comprehensive fault coverage while maintaining operational simplicity through standardized detection routines.
2Measurement precision
If current detection threshold is set low to detect early faults, then fault detection sensitivity increases, but false abnormality determinations increase
Solution Approach 1:
The system changes the operating state parameter (resonant vs. non-resonant) to create different detection conditions. By detecting current in the non-resonant state where background current is minimal, the system achieves high sensitivity for detecting small fault-induced currents without triggering false alarms that would occur if the same threshold were applied during resonant operation with higher normal current levels.
Solution Approach 2:
The abnormality determination process is segmented into distinct phases: non-resonant state detection before power transmission, and resonant state detection during power transmission. Each phase uses appropriate reference ranges calibrated for its specific operating conditions, allowing sensitive fault detection without false positives from normal operational variations.
3Reliability
If abnormality determination is performed in both resonant and non-resonant states, then fault detection comprehensiveness improves, but the determination process becomes more complex
Solution Approach 1:
The non-resonant state abnormality determination is performed as a preliminary check before entering resonant state for power transmission. This preliminary screening catches faults early when they are most easily detected and least likely to cause operational disruptions, reducing the burden on the resonant-state detection system and simplifying overall control logic.
Solution Approach 2:
The system uses feedback from non-resonant state detection results to control whether resonant state operation should proceed. If abnormalities are detected in the non-resonant state, the system prevents entry into resonant state, avoiding potential power supply issues. This feedback mechanism coordinates the two detection phases efficiently without requiring complex simultaneous control.
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
Faults in the wireless power supply apparatus can be detected at an early stage, preventing power supply failures and ensuring reliable operation.
Implementation Method 1
a primary coil capable of being magnetically coupled with the secondary coil
Implementation Method 2
a power transmission resonant circuit that includes a primary coil capable of being magnetically coupled with the secondary coil and a primary capacitor
Data Source
AI summary
A wireless power supply apparatus includes a power transmission resonant circuit, a switching circuit, and a unit-control unit that controls the switching circuit. The unit-control unit performs at least either of a first abnormality determination process for determining whether the wireless power supply apparatus is abnormal using a first detection value detected by a detecting unit in a non-resonant state, and a second abnormality determination process for determining whether the wireless power supply apparatus is abnormal using a second detection value detected by the detecting unit in a resonant state.