Power Distribution System with Bidirectional DC/DC Converter
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Solution Overview
Problem
Existing power supply systems with redundant batteries, especially those using lithium-ion batteries and bidirectional DC/DC converters, face reliability issues due to strict voltage control requirements and potential failures in relays and converters, which are not adequately addressed by simple relay control methods.
Innovation Solution
A power distribution system that includes a bidirectional DC/DC converter connected between two batteries and relays, with a control unit that monitors and controls the operation states of both batteries, relays, and the DC/DC converter to ensure reliable power supply by switching between charging, discharging, and stopping states based on detected faults and vehicle conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If a bidirectional DC/DC converter is connected to a lithium-ion battery for redundant power supply, then energy density and weight are improved, but reliability deteriorates due to strict voltage control requirements and potential converter failures
Solution Approach 1:
The system divides the power supply function into multiple independent paths: the bidirectional DC/DC converter path and the relay path. This segmentation ensures that if one path fails (converter or relay), the other can still supply power, thereby improving overall system reliability while maintaining the weight benefits of lithium-ion batteries
Solution Approach 2:
The control unit dynamically changes the operating parameters of the bidirectional DC/DC converter based on detected states (charging, discharging, stopping) and system conditions. This allows the system to adapt to different scenarios and maintain reliable power supply by adjusting converter operation modes, thereby resolving the contradiction between converter complexity and reliability
2Device complexity
If simple relay control is used in redundant power supply systems, then device complexity is reduced, but reliability deteriorates due to inability to detect and respond to relay and converter failures
Solution Approach 1:
The control unit implements feedback mechanisms by detecting the operational states of relays and bidirectional DC/DC converters. This feedback enables the system to identify failures and switch to alternative power paths, thereby improving reliability without requiring overly complex control logic
Solution Approach 2:
The control unit automatically detects failures and switches power paths without requiring external intervention or complex manual control systems. This self-service capability improves reliability while keeping the control system relatively simple, as the existing control unit handles both simple relay control and converter management
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 enhances the reliability of power supply to loads by considering not only battery faults but also relay and converter failures, ensuring stable power delivery even under multiple failure scenarios.
Implementation Method 1
a bidirectional DC/DC converter connected between the first terminal and the second terminal
Data Source
AI summary
Provided is a power distribution system for improving the reliability of power supply to the load in a case where a bidirectional DC/DC converter is connected to one power supply when redundantly configuring a power supply, including: a first terminal to be connected to a first battery; a second terminal to be connected to a second battery; a load terminal to be connected to a load; a bidirectional DC/DC converter connected between the first terminal and the second terminal; a first relay connected between the first terminal and the load terminal; a second relay connected between the second terminal and the load terminal; a control unit for performing controls of an operation direction of the bidirectional DC/DC converter, an opening and closing operation of the first relay, and an opening and closing operation of the second relay.