Transformer Isolation for EV and Grid Power Switching
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Solution Overview
Problem
Current systems lack effective protection mechanisms to minimize the impact of electric failures between external power supplies, such as those from electric vehicles, and commercial electric power systems, which can lead to unsafe conditions and system malfunctions.
Innovation Solution
An electric power system protection device with a transformer having electrically isolated primary and secondary windings, combined with leakage detectors and ground parts, and a switching device that automatically switches between external and commercial power sources to prevent cross-influence and ensure safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If electric power is supplied from external power supply to commercial power supply system, then power supply capability is improved, but electric failure can cause harmful effects to the system
Solution Approach 1:
A transformer is introduced as an intermediary device between the external power supply and the commercial power supply system. The transformer electrically isolates the two systems while allowing power transfer, thus preventing electric failures in one system from directly affecting the other system
2Reliability
If electric leakage detection is implemented, then safety is improved, but device complexity increases
Solution Approach 1:
The electric leakage detection function is segmented into two independent detectors: one for the external power supply side and one for the commercial power supply system side. This segmentation allows each detector to operate independently with simpler circuitry, while collectively providing comprehensive safety monitoring for both systems
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 solution effectively isolates the external and commercial power paths, allowing for safe operation by detecting and mitigating electric failures, thereby reducing the risk of electric shock and system malfunctions.
Implementation Method 1
a transformer including a primary winding and a secondary winding which are electrically isolated from each other
Implementation Method 2
a first leakage detector and a second leakage detector, and first and second ground parts. The first leakage detector is provided to a first electric path and detects electric leakage from the first electric path
Data Source
AI summary
The electric power system protection device according to the present invention includes a transformer including a primary winding and a secondary winding which are electrically isolated from each other. The primary winding is to be connected to a first electric path which is to be connected to an external power supply configured to supply AC power by use of a secondary battery, so as to receive the AC power from the external power supply. The secondary winding is to be connected to a second electric path to be connected to a power supply path from a commercial electric power system to an electric load.