Redundant Power Supply Switching for Vehicle Overvoltage Response
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Solution Overview
Problem
Existing power source systems for vehicles face challenges in maintaining correct operation of electric loads when overvoltage occurs, as the existing systems may supply excessive voltage to electric loads until the intersystem switch is opened, potentially causing malfunctions.
Innovation Solution
A power source system with a first and second power source, an intersystem switch, a switching controller, and a charging discharging part. The charging discharging part starts charging the second power source's battery before switching the intersystem switch to the open state when overvoltage occurs, allowing the battery to receive the overvoltage and prevent excessive voltage from reaching the electric loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the intersystem switch is opened when overvoltage occurs, then the electric loads are protected from excessive voltage, but the battery cannot receive the overvoltage energy causing potential damage
Solution Approach 1:
The patent divides the power supply path into two separate paths: a first power supply path for normal operation and a second power supply path for overvoltage conditions. The intersystem switch segments these paths, allowing selective connection based on voltage conditions. This segmentation enables the system to route overvoltage energy through the battery while protecting the electric loads through the first path.
Solution Approach 2:
The battery serves as an intermediary element that absorbs excess voltage energy. When overvoltage occurs, the battery receives the excessive voltage through the second power supply path, acting as a buffer between the overvoltage source and the electric loads. This intermediary function protects both the battery (through controlled charging) and the electric loads (through isolation via the intersystem switch).
2Use of energy by moving object
If the intersystem switch remains closed during overvoltage, then the battery can be charged, but excessive voltage reaches the electric loads causing malfunctions
Solution Approach 1:
The intersystem switch dynamically changes its state based on voltage conditions. During normal operation, the switch remains closed to enable battery charging through the second path. When overvoltage is detected, the switch opens to isolate the electric loads from the excessive voltage while maintaining the battery charging function through the second path. This dynamic switching resolves the contradiction between continuous charging and load protection.
Solution Approach 2:
The system performs preliminary action by opening the intersystem switch before the overvoltage can reach the electric loads. The control unit detects overvoltage conditions and actuates the switch to the open position in advance, preventing excessive voltage from entering the first power supply path. This preliminary protective action ensures load reliability while maintaining battery charging capability.
3Reliability
If the intersystem switch is opened quickly to protect loads, then load protection is improved, but the transition time may cause voltage instability
Solution Approach 1:
The patent maintains continuity of useful action by ensuring that the battery charging function continues uninterrupted through the second power supply path. When the intersystem switch opens to protect the electric loads, the battery remains connected to the power source through the second path, allowing continuous energy absorption and voltage stabilization. This continuous charging action prevents voltage instability during the switch transition.
Solution Approach 2:
The system changes operational parameters by transitioning the intersystem switch between closed and open states based on voltage thresholds. When voltage exceeds the overvoltage threshold, the switch opens, fundamentally changing the circuit configuration from a single connected path to a segmented path. This parameter change (switch state) enables rapid protection while the battery's continuous charging maintains overall voltage stability.
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
This configuration ensures that electric loads receive the correct voltage, preventing malfunctions due to overvoltage and maintaining system stability even when abnormal conditions occur.
Implementation Method 1
The second power source has a battery to be charged by the power source voltage of the first power source
Implementation Method 2
The charging discharging part performs discharging of the battery after completion of charging of the battery
Data Source
AI summary
A power source system has a first system having a first power supply path and a first power source supplying a power source voltage, a second system having a second power supply path and a second power source having a battery being charged by the power source voltage, an intersystem switch, a switching controller switching the intersystem switch between an open state and a closed state, and a charging discharging part, arranged between the second power source and a connection node of a connection path on the second power supply path. The charging discharging part performs charging of the battery by the power source voltage and discharging of the battery based on a discharging request after completion of battery charging, and performs charging of the battery before the switching controller switches the intersystem switch to the open state from the closed state when overvoltage occurs in any system under the closed state of the intersystem switch.