Vehicle Charging System Relay Timing Control
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Solution Overview
Problem
Existing vehicle-mounted charging systems fail to prevent abnormal currents when charging batteries using different DC charging methods, such as CHAdeMO and CCS, leading to inefficiencies and potential charging issues.
Innovation Solution
A vehicle-mounted charging system with relays and controllers that manage power supply and communication paths to match the charging method, including a first relay for power switching, a charging controller, a relayer for communication conversion, and a delay controller to synchronize power supply timing, ensuring safe and efficient charging regardless of the charging method employed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If relay devices are used to convert and relay control signals between different DC charging methods, then charging compatibility is improved, but abnormal currents such as reverse current or rush current cannot be prevented
Solution Approach 1:
The patent introduces a relay device that acts as an intermediary between the charging station and the vehicle. This relay device not only converts and relays control signals between different DC charging methods (CHAdeMO and Combo) but also actively prevents abnormal currents such as reverse current or rush current caused by potential differences. The relay device includes switching elements that control the connection and disconnection of power supply paths, ensuring both charging compatibility and current safety.
Solution Approach 2:
The relay device performs preliminary actions by pre-controlling the connection timing of power supply paths before abnormal currents can occur. By using control signals to activate switching elements in advance, the system ensures that power connections are established at appropriate times, preventing rush currents and reverse currents while maintaining compatibility with different charging methods.
2Productivity
If the relay device connects power supply paths immediately, then charging speed is improved, but abnormal currents may occur due to potential difference between battery voltage and DC voltage
Solution Approach 1:
The relay device performs preliminary actions by pre-controlling the connection timing of power supply paths before abnormal currents can occur. By using control signals to activate switching elements in advance, the system ensures that power connections are established at appropriate times, preventing rush currents and reverse currents while maintaining compatibility with different charging methods.
Solution Approach 2:
The relay device incorporates feedback mechanisms by monitoring the state of power supply paths and battery voltage. Based on this feedback, the control signals adjust the timing of switching element activation, ensuring that connections are made only when safe, thus preventing abnormal currents while optimizing charging speed.
Data Source
AI summary
A vehicle-mounted charging system is provided that can charge a battery regardless of the charging method and prevent an abnormal current from occurring between a vehicle and a charging station. A first charging controller, controls charging in accordance with a first charging method, communicates with a first charging apparatus via a charging cable connected to a first inlet, and charges a battery by turning on a DC cutoff relay, provided on a power supply path from the first inlet to the battery. If it is determined that charging is to be performed in accordance with a second charging method, a charging control unit relays communication between a second charging apparatus and the first charging controller. The charging control unit performs control to delay the timing of actually turning on the DC cutoff relay relative to the timing at which the first charging controller turns on the DC cutoff relay.