Bidirectional DC/DC Converter Battery Redundancy Control
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Solution Overview
Problem
Existing power supply systems for vehicles with Advanced Driving Safety Assistance Systems (ADAS) face reliability issues due to delayed power supply and potential failures in both batteries and control systems, particularly when using lithium-ion batteries as sub-batteries, which require strict voltage control.
Innovation Solution
A power distribution system that includes a bidirectional DC/DC converter to detect output voltages of both batteries and control charge and discharge operations, with a control unit determining which battery to supply power from based on detected voltage drops, ensuring redundant detection to prevent false failure detection and improve reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single control unit monitors battery voltage, then the system structure is simple, but the reliability of power supply determination is insufficient
Solution Approach 1:
The patent implements a feedback mechanism where the bidirectional DC/DC converter continuously monitors battery output voltage and feeds this information back to the control unit. This closed-loop feedback enables real-time detection of battery status changes, improving the reliability of power supply determination while maintaining manageable system complexity through automated monitoring.
Solution Approach 2:
The bidirectional DC/DC converter serves as an intermediary component between the batteries and the control unit. It not only performs power conversion but also acts as a detection intermediary that monitors battery output voltage and communicates status information to the control unit, thereby enhancing detection reliability without requiring direct complex monitoring infrastructure.
2Reliability
If redundant detection by bidirectional DC/DC converter and control unit is implemented, then the reliability of power supply determination is improved, but the device complexity increases
Solution Approach 1:
The bidirectional DC/DC converter is designed with multi-functionality, serving both as a power conversion device and as a battery monitoring component. By integrating detection functions into an existing necessary component, the system achieves redundant detection capability without adding separate dedicated monitoring devices, thus improving reliability while controlling complexity.
3Use of energy by moving object
If lithium-ion battery is used as sub battery, then the energy density and size are improved, but the voltage control requirement becomes stricter
Solution Approach 1:
The bidirectional DC/DC converter acts as an intermediary that manages voltage control between the lithium-ion sub battery and the rest of the system. It provides galvanic isolation and voltage matching, allowing the high-energy-density lithium-ion battery to be integrated without requiring complex direct voltage control circuits, thus maintaining energy density benefits while managing voltage control complexity.
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 solution enhances the reliability of power supply to loads by ensuring stable power distribution even in cases of battery or control system failures, reducing the risk of power outages and improving overall system stability.
Implementation Method 1
a bidirectional DC/DC converter detecting an output of the first battery (101) and an output of the second battery (102), and controlling charge and discharge operation of the second battery (102)
Data Source
AI summary
Provided is a power distribution system for improving reliability of power supply to the load in a case where a bidirectional DC/DC converter is connected to one power supply when making a power supply redundant, connecting a first battery and a second battery so as to supply power to a load, including: a bidirectional DC/DC converter detecting an output of the first battery and an output of the second battery, and controlling charge and discharge operation of the second battery: and a control unit detecting the output voltage of the first battery and the output voltage of the second battery, and determining from which one of the first battery and the second battery power should be supplied to the load based on detection results by the control unit and the bidirectional DC/DC converter.