EVSE Charging Controller Preventing Initial Current Overshoot
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Solution Overview
Problem
Electric Vehicle Supply Equipment (EVSE) often fails to charge batteries due to overshoot in initial charging current, leading to charging interruptions and inaccurate estimated charging times.
Innovation Solution
An apparatus and method that includes a controller to receive initial charging command information, generate initial charging information to prevent overshoot, and use a battery management system to stabilize charging, allowing the battery to be charged using an on-board charger after a preset time, with communication technologies like CAN, PLC, or Bluetooth for data exchange.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If EVSE uses a charging current that exceeds the control pilot (CP) duty at the beginning of charging, then charging speed is improved, but charging interruption occurs due to overshoot
Solution Approach 1:
The controller performs preliminary action by receiving initial charging command information from EVSE and generating initial charging information before actual charging begins. This preliminary processing ensures the charging current is properly conditioned to prevent overshoot while maintaining charging speed, resolving the contradiction between productivity and reliability
Solution Approach 2:
The battery management system provides feedback by sensing battery parameters and transmitting this information to the controller. This feedback mechanism allows the system to monitor charging stability in real-time and adjust the charging current accordingly, preventing overshoot-induced interruptions while maintaining efficient charging
2Reliability
If EVSE limits maximum output for slow charging, then charging stability is improved, but charging time increases
Solution Approach 1:
The system dynamically adjusts charging parameters by using initial charging command information to generate appropriate initial charging information. The charging current is dynamically controlled based on real-time battery status feedback, allowing the system to maintain stability while optimizing charging time through adaptive parameter adjustment rather than fixed limiting
3Productivity
If charging is attempted after first interruption, then charging continuity is improved, but charging interruption recurs due to overshoot
Solution Approach 1:
The battery management system continuously senses battery parameters and provides feedback to the controller after interruptions. This feedback ensures that when charging is resumed, the controller can generate appropriate initial charging information based on current battery status, preventing recurrent overshoot and maintaining both continuity and reliability
Solution Approach 2:
Before resuming charging after an interruption, the controller performs preliminary processing by receiving initial charging command information and generating initial charging information. This preliminary action prevents overshoot upon resumption, ensuring both charging continuity and reliability are maintained
Data Source
AI summary
An apparatus for preventing overshoot at the beginning of slow charging is provided. The apparatus includes a controller configured to receive initial charging command information during slow charging from electric vehicle supply equipment (EVSE) and generate initial charging information for preventing overshoot using the initial charging command information. The apparatus further includes a charger for performing charging of a battery using the initial charging information, and a battery management system (BMS) configured to generate sensing information by sensing the charger, and charge the battery using the sensing information based on an originally set algorithm of the EVSE after a preset time based on whether the charging of the battery is stabilized.