EV Charging Control Device Reduces Current After Power Failure
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Solution Overview
Problem
Conventional household power sockets trigger overcurrent protection devices at low charging currents, leading to intermittent power supply failures and potential damage to electrical installations when charging electric vehicles, especially when additional consumers are connected to the circuit.
Innovation Solution
A method that automatically reduces the charging current by at least 10% following a power supply failure, allowing the charging process to continue without user intervention and preventing repeated overcurrent protection device triggering, by implementing a variable charging current limit that can be adjusted in the vehicle or in-cable control device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the charging current is increased to charge the electric vehicle faster, then the charging speed is improved, but the overcurrent protection device is triggered and the power supply is interrupted
Solution Approach 1:
The charging current is made dynamically adjustable based on the operational state. After a power supply failure, the control device automatically reduces the charging current to a lower level for subsequent charging operations, transforming the static current setting into a dynamic one that adapts to prevent overcurrent protection triggering while maintaining charging functionality
Solution Approach 2:
The charging current parameter is changed from a fixed high value to a reduced value after power supply failure. The control device modifies the current parameter based on the failure event, enabling the system to operate within safe current limits and avoid triggering the overcurrent protection device
2Reliability
If the charging current is reduced to prevent overcurrent protection device triggering, then the power supply reliability is improved, but the charging speed decreases
Solution Approach 1:
The control device performs preliminary action by detecting power supply failure and proactively reducing the charging current before the overcurrent protection device can be triggered. This preventive measure ensures continuous power supply while managing charging speed expectations
Solution Approach 2:
The system implements feedback by monitoring the power supply status and using this information to adjust the charging current. The control device receives feedback about power supply failures and automatically modifies the charging parameters in response, creating a closed-loop control system
3Reliability
If the overcurrent protection device is manually reset after tripping, then the power supply is restored, but the charging current remains high and causes repeated tripping
Solution Approach 1:
The control device provides self-service by automatically detecting power supply restoration and adjusting the charging current to an appropriate level without requiring user intervention. This prevents repeated tripping of the overcurrent protection device and eliminates the need for users to manually modify charging parameters
Solution Approach 2:
The manual resetting process is replaced by an automated electronic control system. Instead of requiring mechanical intervention (manual reset and current adjustment), the electronic control device automatically manages the charging current based on power supply status, substituting human action with automated electronic control
Data Source
AI summary
A method is provided for charging an electrical energy store on an electric vehicle at a socket providing a power supply, particularly a single-phase 230 V or 120 V domestic socket. The charging current used to charge the electrical energy store after failure and subsequent restoration of the power supply is automatically reduced over the charging current prior to failure of the power supply.