Electric Power Supply System Current Suppression Control
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Solution Overview
Problem
Existing electric power supply systems for electric vehicles face challenges in efficiently managing battery charging and discharging, leading to battery deterioration due to repeated charging and discharging cycles during load driving modes, which affects the battery's state of charge and overall performance.
Innovation Solution
An electric power supply system that includes a battery, an electric power receiving apparatus, a switching apparatus, and a control apparatus, where the switching apparatus can switch between a normal state and a current suppression state, and the control apparatus manages the electrical connection state based on the output power of the electric power receiving apparatus to minimize battery stress and prevent excessive voltage differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the electric power receiving apparatus continuously charges the battery during load driving mode, then the battery state of charge is maintained, but battery deterioration occurs due to repeated charging and discharging cycles
Solution Approach 1:
The control apparatus preliminarily determines whether the electric power receiving apparatus can receive external electric power before entering load driving mode. Based on this preliminary determination, it proactively sets the electrical connection state to prevent unnecessary battery charging cycles, thereby avoiding battery deterioration before it occurs.
Solution Approach 2:
The system dynamically adjusts the electrical connection state between normal state and high-impedance state based on real-time conditions. The control apparatus switches connection states depending on whether external electric power is available and the current operating mode, optimizing battery usage patterns to reduce charging/discharging cycles.
2Loss of energy
If the switching apparatus operates in normal state allowing full current flow, then power transmission efficiency is high, but excessive voltage differences may occur between battery and ground
Solution Approach 1:
The switching apparatus acts as an intermediary between the battery and ground, capable of switching between normal state (allowing current flow) and high-impedance state (suppressing current flow). This intermediary function allows the system to control voltage differences by adjusting the electrical connection state based on voltage difference detection.
3Reliability
If the control apparatus frequently switches electrical connection state during load driving mode, then battery stress is reduced, but system complexity increases
Solution Approach 1:
The control apparatus autonomously manages the electrical connection state based on predetermined conditions and detected parameters. It automatically determines when to switch between normal state and high-impedance state without requiring external intervention, reducing control complexity while maintaining battery health through condition-based switching.
Data Source
AI summary
An electric power supply system includes a battery, an electric power receiving apparatus that is coupled to the battery in parallel with a load and receives and supplies external electric power to the battery, a switching apparatus that allows or cuts off connection of the electric power receiving apparatus and the load to the battery and is switchable between a normal state and a current suppression state when the connection is allowed, and a control apparatus that permits a load driving mode if the external electric power is receivable. In the load driving mode, the control apparatus controls an electrical connection state of the electric power supply system to a first connection state in which the electric power receiving apparatus and the load are coupled to the battery via the switching apparatus in the current suppression state, depending on output electric power of the electric power receiving apparatus.