Service Plug Contact Sequencing for Vehicle Power Feed Priority
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Solution Overview
Problem
Existing technologies struggle to efficiently connect or cut off multiple power supply systems, including high-voltage batteries, in a manner that prioritizes their operation, leading to potential faults and misjudgments by electronic control devices.
Innovation Solution
A service plug with a service plug body that includes pairs of conductive members to connect or disconnect power feed circuits, ensuring that the high-voltage battery power is supplied to the drive device before the auxiliary load, and vice versa, when the service plug is attached or detached.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If relay circuits are simultaneously connected or cut off, then the power supply systems can be operated together, but the priority of power supply cannot be ensured and faults may occur
Solution Approach 1:
The service plug is designed with conductive members of different lengths so that when the plug is inserted, the first conductive member (longer) establishes electrical connection before the second conductive member (shorter). This preliminary action ensures the high-voltage battery is connected before the auxiliary battery, preventing faults and ensuring proper system initialization without requiring complex control circuits.
Solution Approach 2:
Instead of using complex control logic to manage the sequence of power supply connection, the patent inverts the approach by using mechanical design (different conductor lengths) to automatically establish the correct sequence. The physical structure itself enforces the priority order, simplifying the control system while ensuring reliability.
2Ease of operation
If the service plug connects both power feed circuits simultaneously, then operation is simplified, but the priority-based power supply cannot be ensured
Solution Approach 1:
The service plug incorporates conductive members with different lengths where the first conductive member extends further than the second. When the plug is inserted into the power feed circuit unit, the longer first conductive member makes contact first, establishing connection in advance of the second conductive member. This maintains simple one-handed plug operation while automatically ensuring the correct power supply sequence through the mechanical design itself.
3Reliability
If the auxiliary battery is connected before the high-voltage battery, then the auxiliary load may be damaged due to misjudgment by electronic control devices
Solution Approach 1:
The service plug is designed with a first conductive member that is longer than the second conductive member. When inserted, the first conductive member (connecting to high-voltage battery) establishes electrical connection before the second conductive member (connecting to auxiliary battery). This preliminary connection of the high-voltage battery ensures that electronic control devices receive proper power before the auxiliary battery is connected, preventing misjudgments and potential damage to the auxiliary load without requiring additional protective devices or complex control logic.
Data Source
AI summary
A service plug that is attachable to and detachable from a power feed circuit unit is provided with first conductive members and second conductive members, and when the service plug is attached to the power feed circuit unit, the second conductive members become electrically connected to second connection terminals provided in the power feed circuit unit and supply power to an auxiliary load after the first conductive members become electrically connected to first connection terminals provided in the power feed circuit unit and supply power to a drive device.