Power Distribution Device Voltage Instability Control
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Solution Overview
Problem
Existing power distribution systems in vehicles are prone to instability in downstream power supply boxes due to fluctuations in upstream voltage, particularly during temporary large current consumption, affecting the power supply to connected devices.
Innovation Solution
A power distribution device with switches and a control unit that dynamically adjusts the power supply path based on input and output voltage levels, switching to alternative power sources when upstream voltage instability is detected, ensuring stable power delivery to downstream devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If multiple power supply boxes are connected in a tree structure to distribute power throughout the vehicle, then power can be supplied to various in-vehicle devices, but voltage instability in upstream power supply boxes affects downstream power supply
Solution Approach 1:
The power distribution system is segmented into multiple independent power supply boxes that can operate autonomously. Each power supply box is equipped with its own control unit and switches, allowing it to manage its own power distribution without being directly affected by upstream voltage fluctuations. This segmentation isolates the impact of voltage instability to specific segments rather than propagating throughout the entire downstream network.
Solution Approach 2:
A control unit acts as an intermediary between the power supply source and downstream devices. The control unit monitors input voltage levels and automatically switches between different power sources (direct connection to power supply source or connection to upstream power supply box) based on voltage stability conditions. This intermediary function prevents direct transmission of voltage instability to downstream devices.
2Adaptability or versatility
If power supply boxes are connected in a tree structure, then power distribution coverage is improved, but influence from upstream voltage fluctuations propagates to downstream devices
Solution Approach 1:
The power distribution system employs dynamic switching capabilities where connection configurations are not fixed but can change in real-time. Switches controlled by control units dynamically adjust connection states based on detected voltage conditions, allowing the system to adapt to changing electrical conditions and prevent propagation of harmful voltage fluctuations to downstream devices.
Solution Approach 2:
Control units continuously monitor input voltage levels and use this feedback information to make real-time switching decisions. When voltage instability is detected, the control unit receives feedback about the unstable condition and automatically switches to alternative power sources or configurations, creating a closed-loop control system that actively prevents voltage fluctuation propagation.
3Productivity
If upstream power supply boxes experience temporary large current consumption, then power demand is met, but output voltage becomes unstable affecting downstream power supply
Solution Approach 1:
The control unit performs preliminary monitoring of input voltage levels to detect potential instability before it affects downstream power supply. When voltage instability is anticipated or detected, the control unit proactively switches to alternative power sources or configurations in advance, preventing the propagation of voltage fluctuations to downstream devices before they can occur.
Data Source
AI summary
A power distribution device includes a first switch configured to connect a power supply source or a first device to a second device, a second switch configured to connect the second device and a third device distributing predetermined power, and a control unit configured to control conduction and cutoff of the first and the second switches based on an output voltage of the power distribution device. The control unit switches the first switch to a conductive state and the second switch to a cutoff state when an input voltage of the second device does not drop to a predetermined control start voltage, and switches, when the input voltage of the second device temporarily drops to the control start voltage, the first switch to the cutoff state and the second switch to the conductive state, and supplies the power from the third device to the second device.