Precharge Device Fault Detection via Capacitor Voltage Verification
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Solution Overview
Problem
Existing power supply systems face difficulties in accurately determining abnormalities in precharge devices, leading to unstable communication states and preventing appropriate fail-safe operations and repairs.
Innovation Solution
A power supply system with a control device that transmits a target voltage to a precharge device, determines communication state abnormalities, and uses sensor feedback to confirm precharge completion, enabling accurate abnormality detection even in unstable communication conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the precharge device operates without abnormality determination, then the system can start up, but the abnormality cannot be detected leading to unreliable operation
Solution Approach 1:
The control device receives feedback information from the precharge device about precharge completion status and capacitor voltage. Based on this feedback, the control device determines whether an abnormality has occurred by checking if the precharge completion status matches the expected state. This feedback mechanism enables reliable abnormality detection without requiring complex additional hardware.
2Measurement precision
If communication state monitoring is added to detect abnormalities, then abnormality detection capability is improved, but false determination may occur in unstable communication states
Solution Approach 1:
The patent uses the capacitor voltage as an intermediary parameter to verify precharge completion. Instead of relying solely on direct communication signals that may be unstable, the control device checks whether the capacitor voltage has actually reached the target voltage. This intermediary verification mechanism resolves the contradiction by providing a reliable basis for abnormality determination that is independent of communication stability.
3Device complexity
If precharge completion is determined solely by communication signals, then the determination process is simple, but communication abnormalities cannot be distinguished from precharge failures
Solution Approach 1:
The control device performs preliminary verification by checking the capacitor voltage before finalizing the abnormality determination. When the precharge device reports completion, the control device first verifies whether the capacitor voltage actually matches the target voltage. This preliminary action allows differentiation between communication abnormalities (where voltage doesn't match) and genuine precharge failures (where voltage matches but communication fails).
Data Source
AI summary
A power supply system of the present disclosure includes a power storage device, a power control device that includes a capacitor and is connected to the power storage device, a precharge device that executes precharge of a capacitor of the power control device in response to a system activation request, and a control device that transmits a target voltage of the capacitor to the precharge device in response to the system activation request, determines whether or not there is an abnormality in a communication state with the precharge device, determines whether or not the precharge is completed based on a detection value of a predetermined sensor when an abnormality in a communication state is not determined, determines whether or not the precharge device is normal when the precharge is completed, and determines that an abnormality has occurred in the precharge device when the precharge is not completed.