External Inverter Authentication for Electric Work Vehicle Power Supply
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Solution Overview
Problem
Existing power supply devices for electric work vehicles require inverters to convert DC power to AC power, which can lead to damage if high-output or non-standard inverters are connected, and pose risks of unauthorized power theft and difficulty in removing or selecting appropriate inverters.
Innovation Solution
A power supply device with a battery control unit that authenticates external inverters via a second connection unit, allowing authorized power supply and enabling the removal of external inverters when not needed, while preventing improper connections and allowing for permanent installation or portable use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an external inverter connection unit is provided to allow external inverters to be connected, then power supply flexibility is improved, but the risk of improper connections and battery damage increases
Solution Approach 1:
The battery control unit performs authentication with the external inverter before allowing power supply. This preliminary verification action checks whether the external inverter is properly connected and authorized, preventing improper connections from damaging the battery while still allowing flexible external power supply when authenticated
2Reliability
If authentication communication is implemented with external inverters, then protection against improper connections is improved, but device complexity increases
Solution Approach 1:
The battery control unit, which already exists for managing battery charging and discharge, is extended to perform authentication communication with external inverters. This multi-functional approach allows the same control unit to handle both power management and security authentication, avoiding the need for a separate authentication system and thus limiting the increase in device complexity
3Ease of operation
If external inverters can be freely connected and removed, then ease of operation is improved, but unauthorized power theft becomes possible
Solution Approach 1:
The external inverter performs self-identification by transmitting its own identification information to the battery control unit. This self-service authentication approach allows the inverter to prove its legitimacy without requiring manual verification or complex external authentication systems, maintaining ease of operation while preventing unauthorized connections
Data Source
AI summary
A power supply device for an electric work vehicle, including: a battery by which an electric work vehicle is drivable; a first connection unit for an internal inverter configured to convert DC power from the battery into AC power, and output the AC power to an internal electric device installed in the electric work vehicle; a second connection unit for an external inverter configured to convert DC power from the battery into AC power, and output the AC power to an external electric device; and a battery control unit connected to the first connection unit and the second connection unit, and configured to control charging of, and power supply from, the battery, wherein the battery control unit is configured to communicate with the external inverter side via the second connection unit to perform authentication regarding whether or not power supply to the external inverter is permitted.