Vehicle Backup Power Path for Converter-Bypass Load Supply
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Solution Overview
Problem
Existing power supply systems in vehicles face delays in supplying electric power to critical loads during abnormalities due to the need for preparation processes in electric power conversion, leading to potential loss of functionality in essential vehicle systems.
Innovation Solution
A power supply system with dual power supplies and an inter-system switch, featuring parallel paths with and without electric power converters, allows immediate voltage application to loads via a charged storage battery, bypassing converters during abnormalities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electric power conversion is performed through converters during abnormalities, then power supply stability is improved, but response time deteriorates due to preparation processes
Solution Approach 1:
The storage battery is pre-charged to a voltage higher than the lower limit of drive voltages during normal operation through the electric power converter. When an abnormality occurs in the first system, the inter-system switch opens and the pre-charged storage battery can immediately supply power through the second path without requiring converter preparation time, thus resolving the contradiction between stability and response time.
Solution Approach 2:
The storage battery acts as an intermediary energy storage device between the first power supply system and the electrical loads. It accumulates excess energy during normal operation and releases it during abnormalities, mediating the transition between stable power supply mode and emergency power supply mode without requiring active conversion during the emergency response phase.
2Reliability
If dual power supply systems with converters are used, then power supply reliability is improved, but system complexity increases
Solution Approach 1:
The power supply system is segmented into two independent systems: the first system with the first power supply and converter for normal operation, and the second system with the storage battery and second converter for emergency operation. The inter-system switch provides clean separation between systems. This segmentation allows each subsystem to be simpler while achieving overall high reliability through redundancy.
Solution Approach 2:
Different parts of the system have different functions optimized for their specific roles. The first converter and first power supply are optimized for normal power conversion, while the storage battery and second path are optimized for immediate emergency power supply. The inter-system switch enables local activation of the appropriate path based on system status, reducing the operational complexity of managing the entire dual-system configuration.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Ensures continuous and stable power supply to critical vehicle loads by bypassing converters during abnormalities, maintaining functionality without delays.
Implementation Method 1
The second power supply includes a storage battery chargeable by the power supply voltage of the first power supply
Data Source
AI summary
A power supply system includes: electrical loads; a first system including a first power supply that outputs a power supply voltage; a second system including a second power supply that includes a storage battery; an inter-system switch; an abnormality determination unit that determines whether an abnormality has occurred in the first system; and a state control unit that opens the inter-system switch when it is determined that an abnormality has occurred in the first system. A first path and a second path are provided in parallel with each other between a connection point and the second power supply. In the first path, there is provided an electric power converter. The storage battery is charged to a voltage higher than the lower limit of drive voltages of the electrical loads. Through the second path, the voltage of the storage battery can be applied, bypassing the power converter, to the electrical loads.