Relay-Isolated Voltage Detection for Series Power Supply Anomalies
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Solution Overview
Problem
Existing in-vehicle power supply systems cannot effectively detect anomalies in both power storage units connected in series, as they often enter an open state, and the detection of anomalies in one unit can negatively affect voltage detection in the other.
Innovation Solution
An anomaly detection device and method that utilize a relay to separate the power path into two sides, employing first and second voltage detectors to detect anomalies based on voltages on both sides of the relay when it is in a cut-off state, preventing voltage propagation and allowing for simultaneous anomaly detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If voltage detection is performed on both power storage units simultaneously, then anomaly detection capability is improved, but voltage propagation between units causes detection interference
Solution Approach 1:
The power supply system is segmented into two independent detection circuits, each monitoring one power storage unit. The relay isolates the segments during detection, preventing voltage propagation between them. This allows simultaneous anomaly detection on both units without interference, as each detection circuit operates independently on its own segment.
Solution Approach 2:
The relay acts as an intermediary device that enables simultaneous voltage detection on both power storage units by controlling the connection state. When the relay is in the open state, it mediates between the two units, allowing detection circuits to measure voltages independently without direct electrical connection, thus preventing mutual interference while maintaining detection capability.
2Productivity
If the relay is kept in conductive state for continuous power supply, then power transmission is maintained, but anomaly detection cannot be performed
Solution Approach 1:
The relay performs periodic switching between conductive and open states. During the open state period, anomaly detection is enabled on both power storage units. During the conductive state period, normal power transmission resumes. This periodic action allows the system to alternate between detection mode and operation mode, ensuring both power transmission continuity and regular anomaly detection without permanent disruption to power supply.
Data Source
AI summary
An anomaly detection device for a power supply system includes: a first power supply unit; a second power supply unit; a first conductive path and a second conductive path for transmitting electric power between the first power supply unit and the second power supply unit; and a relay for controlling current through the first conductive path and the second conductive path. The anomaly detection device includes: a first voltage detector for detecting a first voltage on the first power supply unit side of the first and the second conductive paths relative to the relay; a second voltage detector for detecting a second voltage on the second power supply unit side of the first and second conductive paths relative to the relay; and a detector for detecting an anomaly based on the first voltage and the second voltage when the relay is in a cut-off state.