Electrostatic Coupler Circuit for High-Frequency Fault Current Limiting
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional non-contact power supply systems face challenges with short circuits and ground faults, leading to large currents that can damage equipment like inverters, and there are few circuit breakers suitable for high-frequency currents, which are expensive.
Innovation Solution
Incorporating a different-phase coil with an inductance component between the filter circuit and electrostatic coupler in the non-contact power supply system to limit short-circuit or ground fault currents, using reactors and capacitors to manage high-frequency currents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If circuit breakers are used to prevent large current from flowing to equipment during short circuit or ground fault, then equipment protection is improved, but device complexity and cost increase due to limited availability and high price of high-frequency circuit breakers
Solution Approach 1:
The patent introduces a different-phase coil as an intermediary component between the power source and equipment. This coil provides inductance that naturally limits high-frequency short-circuit and ground-fault currents without requiring specialized circuit breakers. The different-phase coil acts as a mediator that protects equipment from large currents while being compatible with standard circuit protection devices.
Solution Approach 2:
The patent changes the electrical parameters of the circuit by adding inductance through the different-phase coil. This inductance parameter modification creates impedance that limits high-frequency currents during faults, transforming the circuit's current-limiting capability without requiring expensive high-frequency circuit breakers.
2Power
If high-frequency current is used in non-contact power supply system, then power transmission efficiency is improved, but risk of equipment damage from short circuit or ground fault increases
Solution Approach 1:
The patent applies preliminary anti-action by pre-installing the different-phase coil with inductance in the circuit before any fault occurs. This inductance is prepared in advance to counteract and limit high-frequency short-circuit and ground-fault currents when they occur, preventing equipment damage before it can happen.
Solution Approach 2:
The patent converts the potentially harmful high-frequency current that could cause equipment damage into a beneficial protected current flow. The different-phase coil's inductance transforms the harmful high-frequency fault current into a limited, controlled current that protects equipment while maintaining power transmission efficiency.
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
Prevents large currents from flowing during short circuits or ground faults, thereby protecting equipment and ensuring continuous power supply to traveling vehicles.
Implementation Method 1
a different-phase coil between the filter circuit of the one non-contact power supply device and the two capacitors of the electrostatic coupler and including an inductance component when a short-circuit or a ground fault occurs
Implementation Method 2
an electrostatic coupler to electrostatically couple one non-contact power supply device to another non-contact power supply device and including two capacitors electrically connected in parallel
Implementation Method 3
a filter circuit connected to an inverter to convert power supplied from a power source into AC power
Data Source
AI summary
In a non-contact power supply system, each of a plurality of non-contact power supply devices includes a filter circuit connected to an inverter to convert power supplied from a power source into AC power and including a reactor and capacitors. The non-contact power supply system includes an electrostatic coupler to electrostatically couple one non-contact power supply device to another non-contact power supply device. The electrostatic coupler includes two capacitors electrically connected in parallel, and a different-phase coil between the filter circuit of the one non-contact power supply device and the two capacitors. The different-phase coil includes an inductance component when a short-circuit or a ground fault occurs.