DC-DC Converter Fault Isolation in Parallel Auxiliary Battery Circuits
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Solution Overview
Problem
Conventional power supply systems fail to effectively narrow down fault ranges when multiple loads are connected in parallel with a DC-DC converter, leading to difficulties in diagnosing and isolating faults in the circuit involving the DC-DC converter and the low-voltage battery system.
Innovation Solution
A power supply system that includes a DC-DC converter connected to both high-voltage and low-voltage batteries, with a varying control section and determination section to diagnose faults by varying the output voltage or current and using detection values to determine fault ranges, including self-diagnosis capabilities for the DC-DC converter and battery abnormality detection for the low-voltage battery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple loads are connected in parallel with the auxiliary battery to the DC-DC converter, then the power supply system can serve more components, but fault diagnosis becomes more difficult and the fault range cannot be effectively narrowed down
Solution Approach 1:
The patent segments the wiring system into distinct detection zones by placing detection points at specific locations: one detection point is arranged in series with the DC-DC converter on the second wire, and another detection point is arranged in series with the auxiliary battery. This segmentation allows the control device to isolate and identify faults in specific segments (converter side vs. battery side) even when multiple loads are connected in parallel, thereby resolving the fault diagnosis difficulty while maintaining system versatility.
2Measurement precision
If conventional detection methods are used without specific detection points, then the system structure remains simple, but the fault range determination is inaccurate and cannot distinguish between converter-side and battery-side faults
Solution Approach 1:
The patent introduces detection points as intermediary elements that facilitate accurate fault diagnosis without significantly complicating the overall system. These detection points act as mediators between the DC-DC converter, auxiliary battery, and control device, enabling precise measurement of voltage or current at critical locations. The control device uses readings from these intermediaries to determine whether faults occur on the converter side or battery side, achieving high measurement precision with minimal added complexity.
Data Source
AI summary
A DC-DC converter is connected to an auxiliary battery using a second wire, and the DC-DC converter steps down a voltage and outputs it to the second wire. Plural loads are connected in parallel with the auxiliary battery to the DC-DC converter using plural third wires. A power supply control ECU varies the output voltage of the DC-DC converter and determines a fault range based on the output voltage of the DC-DC converter and a charging/discharging current of the auxiliary battery at that time.