Dual-Circuit Vehicle Power Supply for Stall-Time Current Switching
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Solution Overview
Problem
Conventional power supply systems for vehicles struggle to efficiently switch between small and large currents, leading to excessive battery consumption and inability to power electronic components after the vehicle stalls.
Innovation Solution
A power supply system comprising a first and second power supply circuit and a controller, allowing for smooth switching between small and large currents by disconnecting the first power supply circuit and connecting the second when a threshold current is reached, thereby reducing quiescent current consumption and ensuring continuous power supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If HSD works normally after vehicle stall, then electronic components can be powered, but large current is required which depletes battery quickly
Solution Approach 1:
The power supply system is segmented into two distinct circuits: a first power supply circuit (HSD) for normal operation and a second power supply circuit for low-power standby. This segmentation allows each circuit to be optimized for its specific function, enabling the system to switch between high-current and low-current modes based on operational requirements, thus resolving the contradiction between reliable power supply and battery conservation.
Solution Approach 2:
The system dynamically switches between the first and second power supply circuits based on the vehicle's operational state. During normal operation, the HSD provides sufficient current; during standby mode, the system transitions to the second circuit with lower quiescent current. This dynamic adaptation allows the system to maintain reliability when needed while minimizing power consumption during idle periods.
2Use of energy by moving object
If HSD hibernates to save power, then battery consumption is reduced, but electronic components cannot be powered
Solution Approach 1:
The second power supply circuit acts as an intermediary solution during vehicle standby. Instead of completely hibernating the power supply system, this intermediate circuit provides minimal but sufficient power to maintain essential electronic components in a ready state, bridging the gap between full power operation and complete shutdown.
Solution Approach 2:
The system changes the operating parameters of the power supply by switching between two different circuits with different current characteristics. The first circuit operates at high current for normal functions, while the second circuit operates at low quiescent current for standby, allowing the system to adapt its power consumption parameters to match operational requirements.
3Reliability
If fuse is used to power electronic components, then circuit protection is provided, but intelligent monitoring and adaptive current control cannot be implemented
Solution Approach 1:
The controller integrates multiple functions: it monitors current through the shunt resistor, controls the HSD gate signal, manages the second power supply circuit, and provides intelligent decision-making for power distribution. This multi-functional integration enables both circuit protection and adaptive current control, resolving the contradiction between passive protection and intelligent management.
Solution Approach 2:
The system implements feedback control by continuously monitoring the current through the shunt resistor and using this information to intelligently control the HSD gate signal and switch between power supply circuits. This feedback mechanism enables adaptive current management while maintaining circuit protection, transforming the passive fuse function into an active, intelligent power management system.
Data Source
AI summary
This application relates to a power supply system, and a control method and apparatus. The power supply system includes a first power supply circuit, a second power supply circuit, and a controller. A first power supply and a load are connected through the first power supply circuit; a second power supply and the load are connected through the second power supply circuit; and the controller is connected to the first power supply circuit and the second power supply circuit, and controls the first power supply circuit and/or the second power supply circuit to be connected. An output current of the first power supply circuit is a first current when the first power supply circuit is connected, and an output current of the second power supply circuit is a second current when the second power supply circuit is connected. The first current is less than the second current.