Power Supply Management Circuit for Voltage Difference Handling
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Solution Overview
Problem
Existing power supply management systems face issues where a large voltage difference between two power supply circuits can cause a bypass switch to fail, leading to unstable power supply and potential vehicle operation cessation, especially when a predetermined condition necessitates power transfer between circuits.
Innovation Solution
A power supply management system with a first power supply circuit connected in parallel to an electrical storage device and a second power supply circuit, featuring a second switch that connects these circuits when a predetermined condition is met, allowing for controlled power transfer and preventing excessive current flow through the bypass switch.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the bypass switch is closed to connect between the two power supply circuits when voltage difference is large, then power supply from high voltage side to low voltage side is enabled, but the bypass switch and power supply circuit on the low voltage side fail due to large current flow
Solution Approach 1:
The capacitor in parallel with the bypass switch is disconnected before closing the bypass switch. This preliminary action removes the capacitor that would otherwise cause large inrush current when the bypass switch closes, thereby preventing damage to the bypass switch and power supply circuit while still enabling power transfer when needed
Solution Approach 2:
The capacitor is extracted from the circuit by disconnecting it before bypass switch operation. This separation allows the bypass switch to operate without the harmful effects of the capacitor's presence, eliminating the source of large current damage while preserving the power supply function
2Adaptability or versatility
If the bypass switch is used to connect power supply circuits, then power can be supplied from one circuit to another, but the on-vehicle device operation stops and vehicle cannot continue traveling when switch failure occurs
Solution Approach 1:
The capacitor in parallel with the bypass switch acts as an intermediary that stabilizes the voltage transition when the bypass switch operates. This intermediary component prevents voltage spikes and current surges that could cause switch failure, thereby maintaining both power supply flexibility and vehicle continuous operation capability
Solution Approach 2:
The capacitor provides beforehand cushioning by being connected in parallel with the bypass switch. It absorbs voltage transients and current surges that occur during switch operation, protecting the switch from failure and ensuring the power supply system remains reliable for continuous vehicle operation
Data Source
AI summary
A second switch (7) is provided between a first power supply circuit including a first capacitor (4) connected in series with a first switch (6) and a second power supply circuit including a second capacitor (5). In a case where a predetermined condition that necessitates supply of electric power from one power supply circuit to the other power supply circuit is established, the first switch (6) is opened to disconnect the first capacitor (4) in the first power supply circuit, and then the second switch (7) is closed to connect between the first power supply circuit and the second power supply circuit.