Charging Port Switch Segmentation for Selective Rapid Disconnection
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Solution Overview
Problem
Existing charging devices for electric vehicles face inefficiencies in power converter utilization and safety during rapid disconnection, particularly when multiple charging ports are used, as they require large and expensive output switches to handle simultaneous charging operations and emergency disconnections effectively.
Innovation Solution
A charging device with a primary switch arrangement and a control unit that selectively disconnects only the power converters connected to the affected charging port during rapid disconnection conditions, allowing for improved safety and reduced switch requirements by using smaller, cost-effective output switches, while maintaining charging operations at unaffected ports.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If large output switches are used to handle simultaneous charging operations and emergency disconnections, then safety and reliability are improved, but device cost and complexity increase
Solution Approach 1:
The switch arrangement is segmented into multiple independent output switches (first output switch, second output switch, etc.), each controlling a specific charging port. This segmentation allows selective disconnection of individual ports during rapid disconnection events while maintaining control over other ports, reducing the requirement for any single switch to handle the entire system load simultaneously.
Solution Approach 2:
The control unit is configured to detect rapid disconnection conditions and actuate the appropriate output switches before dangerous voltage or current levels can develop. This preliminary action prevents the need for switches to handle extreme transient loads, allowing for smaller, less expensive switches while maintaining safety.
2Reliability
If all power converters are disconnected during rapid disconnection, then safety is improved, but charging operations at unaffected ports are impaired
Solution Approach 1:
The power converter system is segmented into multiple independent groups, each associated with a specific charging port through dedicated output switches. When a rapid disconnection condition is detected at one port, only the corresponding output switch is actuated to disconnect that specific power converter group, while other power converter groups continue operating at unaffected ports.
Solution Approach 2:
The disconnection action is localized to only the affected charging port's power converters rather than affecting the entire system. The control unit identifies which specific output switch corresponds to the affected port and actuates only that switch, maintaining local control quality that preserves overall system productivity while ensuring safety at the problem location.
3Reliability
If stringent rapid disconnection detection is implemented, then safety and fuse protection are improved, but false disconnections may increase
Solution Approach 1:
Rapid disconnection detection and response is implemented with local quality, where each charging port has its own dedicated output switch and control logic. This allows the system to apply stringent safety detection at each port independently without causing system-wide interruptions, as false or actual disconnections are localized to individual ports rather than affecting all charging operations.
Data Source
AI summary
A charging device has first and second charging connections, power converters and a primary switch connected between the charging connections and the power converters. The primary switch connects a first group of power converters to the first charging connection and a second group of power converters to the second charging connection. The control unit checks a rapid disconnection condition for each charging connection, to identify a causative charging connection of the first and second charging connections in the event of a positive checking result of the rapid disconnection condition, and to disconnect the first group of power converters and to leave the second group of power converters connected if the causative charging connection is the first charging connection, and to disconnect the second group of power converters and to leave the first group of power converters connected if the causative charging connection is the second charging connection.