Autonomous Vehicle Dual Power Grid Isolation for Safety Loads
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Solution Overview
Problem
Existing dual power supply systems for autonomous vehicles face inefficiencies due to continuous power supply to non-essential loads and increased capacity requirements for converters and high current switches, which can lead to internal passing currents and reduced power stability during grid failures.
Innovation Solution
A dual power supply apparatus that selectively supplies redundant power to safety loads only during emergency driving modes, using a high current switching device to separate power grids and minimize converter and switch capacity, thereby preventing internal passing currents and ensuring stable power delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If continuous power is supplied to safety loads through converter and high current switch, then power supply reliability is improved, but converter and switch capacity must be increased
Solution Approach 1:
The patent applies preliminary action by pre-charging capacitors during normal operation when the main power grid is functional. This stored energy in capacitors provides immediate power continuity during grid failures, eliminating the need for oversized converters and switches that would otherwise be required to handle full power transfer during emergencies.
2Stability of the object's composition
If dual power is continuously applied to safety loads, then power supply stability is improved, but internal passing current occurs when power grid fails
Solution Approach 1:
The patent introduces capacitors as intermediary energy storage devices between the power grids and safety loads. These capacitors act as buffers that maintain stable power supply to safety loads during grid transitions, preventing direct current passing between grids by decoupling them through the capacitor interface.
3Reliability
If redundant power grid is used for all loads, then power supply reliability is improved, but power efficiency is degraded
Solution Approach 1:
The patent applies local quality by providing redundant power supply capability only to specific safety loads that require it, rather than continuously supplying redundant power to all vehicle loads. The system selectively activates the redundant power grid only for critical safety functions, maintaining reliability where needed while avoiding unnecessary energy consumption for non-critical loads.
Data Source
AI summary
A dual power supply apparatus includes a main power grid that supplies power by a first battery to an autonomous vehicle and a redundant power grid that supplies power to a dual power load based on a second battery, in an emergency driving mode due to a failure in the main power grid.