Leakage Detector for Wireless Power Systems
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Solution Overview
Problem
Existing wireless power transmission systems face challenges in accurately detecting electric leakage due to noise interference, which can lead to secondary faults if not detected promptly.
Innovation Solution
A leakage detector system that includes a conversion circuit to convert DC to AC voltage and a grounded metal member, utilizing an average voltage detection circuit and a leakage detection circuit to accurately identify voltage differences and detect leaks, with features such as alarm notifications and control circuitry to stop power transmission operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If noise component is superimposed on voltage for leakage detection, then the potential difference between power line and ground line changes, but leakage detection accuracy deteriorates
Solution Approach 1:
The patent introduces a grounded metal member as an intermediary reference object. Instead of directly measuring the potential difference between the power line and ground line (which is affected by noise), the measurement is mediated through the metal member that is grounded. This intermediary provides a stable reference potential that is not susceptible to noise interference, thereby enabling accurate leakage detection despite the presence of noise in the system.
2Ease of operation
If simple potential difference monitoring is used between power line and ground line, then detection simplicity is maintained, but leakage detection accuracy deteriorates due to noise
Solution Approach 1:
The grounded metal member serves as a mediator that maintains detection simplicity while improving accuracy. The detection circuit still monitors potential difference in a straightforward manner, but now measures between the power line and the metal member instead of directly between power line and ground line. This intermediary measurement approach preserves operational simplicity while eliminating noise-induced errors.
3Ease of operation
If wireless power transmission is performed without cable connection, then convenience and wireless operation are achieved, but risk of electric leakage and secondary faults increases
Solution Approach 1:
The patent implements preliminary leakage detection by continuously monitoring the potential difference between the power line and the grounded metal member before and during power transmission operations. This preliminary detection mechanism identifies leakage conditions early, allowing the system to take preventive actions (such as interrupting power transmission) before secondary faults can occur, thereby maintaining reliability while preserving wireless operation convenience.
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
The system effectively suppresses erroneous detection caused by noise, enabling high-accuracy leakage detection and preventing secondary faults by stopping power transmission when leaks are detected.
Implementation Method 1
a power transmitting coil that generates an AC magnetic field based on the AC voltage supplied from the drive circuit
Implementation Method 2
a power receiving coil that receives an AC magnetic field and generates an AC voltage based on the AC magnetic field
Data Source
AI summary
Disclosed herein is a leakage detector provided in a device having a conversion circuit that converts a DC voltage and an AC voltage from one to the other and a grounded metal member. The leakage detector comprises: an average voltage detection circuit that detects the average voltage of voltages corresponding to a potential difference between a high-voltage-side terminal or a low-voltage-side terminal on the DC side of the conversion circuit and the metal member; and a leakage detection circuit that detects the presence/absence of a leakage based on the average voltage detected by the average voltage detection circuit.