Wireless Power Theft Detection via Current Decay Analysis
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Solution Overview
Problem
Existing power theft inspection technologies face challenges in accurately detecting power theft in wireless power transmission systems due to difficulties in setting criteria for oscillating magnetic field changes.
Innovation Solution
A power theft inspection apparatus using high-Q LCR resonant circuits for power transmission and reception, which includes a power transmission unit with two terminals, a power supply unit, a first switch unit, a second switch unit for short-circuiting, and a current detecting device, allowing for the determination of power theft by controlling the switches and analyzing current decay patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If oscillating magnetic field detection is used for power theft inspection, then power theft can be detected, but it is difficult to set a criterion for detection
Solution Approach 1:
The patent changes the detection parameter from oscillating magnetic field characteristics to current decay characteristics. By monitoring how current decays after power transmission stops, the system can detect power theft through straightforward threshold comparison, eliminating the complexity of setting oscillating field detection criteria.
Solution Approach 2:
The patent replaces the magnetic field detection mechanism with an electrical current measurement mechanism. Instead of using coils to detect oscillating magnetic fields, the system directly measures current decay, simplifying the detection approach and making criterion setting more straightforward.
2Measurement precision
If separate coils are used for detection, then oscillating magnetic field can be detected, but manufacturing cost increases
Solution Approach 1:
The patent merges the detection function with the existing current measurement capability of the power transmission system. The same current sensors used for normal operation are utilized for power theft detection, eliminating the need for separate detection coils and reducing manufacturing costs.
Solution Approach 2:
The patent makes the current measurement system multi-functional by using it for both normal power transmission monitoring and power theft detection. This universal approach eliminates redundant components and reduces overall system cost while maintaining detection capability.
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
Enables relatively easy detection of power theft by analyzing current decay patterns, eliminating the need for separate coils and reducing manufacturing costs, while preventing excessive voltage application and facilitating efficient power transmission resumption.
Implementation Method 1
a power theft inspection apparatus configured to detect presence or absence of power theft for power transmitting apparatus 10 and a power receiving apparatus 20 which transmit and receive electric power in a wireless manner by magnetic resonance by high-Q LCR resonant circuits
Implementation Method 2
a detection unit which is provided with a coil and which detects an oscillating magnetic field formed around a power transmission unit
Data Source
AI summary
A power theft inspection apparatus is provided with: a controlling device configured to open a third switch unit between a power reception unit and a power reception control circuit of a power receiving apparatus at the start of a power theft inspection, then open a first switch unit between a power transmission unit and a power supply unit of a power transmitting apparatus after the opening of the third switch unit, and then close a second switch unit configured to short-circuit the power transmission unit of the power transmitting apparatus after the opening of the first switch unit; and a determining device configured to determine whether or not there is power theft according to a current detected by a first current detecting device configured to detect a current in the power transmission unit of the power transmitting apparatus upon the power theft inspection.