Wireless Power Resonance Circuit Leakage Detection Control
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Solution Overview
Problem
Unintended electric leakage in the resonance circuit of a power transmission device can occur, leading to inefficient power transmission.
Innovation Solution
A power transmission device with a control device that maintains both output terminals of the power supply device at a potential different from ground potential and detects electric leakage based on electrical characteristics, such as current flow or voltage, using capacitors and resistors in the circuit to identify leakage points.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the power supply device operates normally with AC power input, then power transmission function is provided, but electric leakage cannot be detected in the resonance circuit
Solution Approach 1:
The control device performs electric leakage detection before normal power transmission by temporarily setting both output terminals to the same potential (e.g., both to ground potential or both to a common reference potential). This preliminary detection action identifies leakage points in advance, preventing unsafe operation. The detection is performed by monitoring electrical characteristics (current or voltage) during this temporary potential equalization state, then restoring normal AC power transmission afterward.
2Reliability
If both output terminals are maintained at the same potential for detection, then electric leakage can be identified, but normal power transmission is interrupted
Solution Approach 1:
The control device performs electric leakage detection periodically or at specific moments (e.g., before starting power transmission, or during idle periods) by temporarily setting both output terminals to the same potential. This periodic detection approach ensures safety without continuously interrupting power transmission. The control device monitors electrical characteristics during these brief detection intervals, then immediately restores normal AC power transmission mode, minimizing interruption time while maintaining detection accuracy.
3Reliability
If the resonance circuit is monitored during normal operation, then power transmission efficiency is maintained, but electric leakage detection is not possible
Solution Approach 1:
The control device sets both output terminals to the same potential (equipotential state) during detection mode, which simplifies the electrical characteristics for analysis. By making both terminals equal potential (e.g., both grounded or both at common reference), any current flow or voltage difference detected must be due to electric leakage in the resonance circuit rather than normal operation. This equipotential configuration makes leakage point identification straightforward by monitoring which terminal shows abnormal electrical characteristics when both should be equal.
Data Source
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AI summary
A power transmission device includes: a coil 45 that performs power transmission or power reception in a wireless manner; a power supply device that is connected to the coil and applies a voltage to the coil; and a control device that controls the power supply device. When detecting an electric leakage of the power transmission device, the control device controls the power supply device to maintain both output terminals of the power supply device at the same potential different from a ground potential, and detects the electric leakage based on electrical characteristics of the power transmission device at this time.