Power Switch Fault Differentiation for Motherboard and LCD Cable Shorts
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Solution Overview
Problem
Existing power switch circuits in information handling systems fail to distinguish between motherboard power switch defects and LCD cable shorts, leading to indistinguishable failure indications.
Innovation Solution
Incorporation of an under-voltage detection circuit and an over-current detection circuit with a diode to differentiate between over-current and under-voltage conditions, combined with a panel over-current indication circuit to generate distinct fault indications for motherboard and LCD cable issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single fault indication circuit is used in the power switch, then the device complexity is reduced, but the ability to distinguish between different fault types (motherboard defects vs. LCD cable shorts) is lost
Solution Approach 1:
The fault detection system is segmented into two independent detection circuits: an under-voltage detection circuit for detecting motherboard power switch defects, and an over-current detection circuit for detecting LCD cable shorts. Each circuit independently monitors a specific fault type and generates separate fault indications, enabling precise fault differentiation without requiring a single complex circuit to handle all fault types.
2Measurement precision
If separate detection circuits are implemented for different fault types, then fault identification accuracy improves, but the device complexity increases
Solution Approach 1:
The system divides fault detection into separate functional segments: under-voltage detection for motherboard faults and over-current detection for LCD cable faults. This segmentation allows each circuit to be optimized for its specific detection task, improving accuracy while keeping individual circuit designs relatively simple and manageable.
Solution Approach 2:
The patent introduces a wired-OR logic configuration as an intermediary mechanism that combines the outputs of multiple detection circuits. This wired-OR logic acts as a simple mediator that consolidates multiple fault indications into a unified fault signal structure, reducing the complexity of signal integration while maintaining the ability to distinguish between different fault types through the specific patterns of fault indications.
3Reliability
If comprehensive fault detection is implemented, then system reliability improves, but the ease of operation for troubleshooting decreases due to multiple fault indications
Solution Approach 1:
By segmenting fault detection into distinct under-voltage and over-current detection circuits, each targeting a specific fault type, the system provides clear, unambiguous fault indications. This segmentation eliminates the confusion that would arise from a single undifferentiated fault signal, making troubleshooting easier while maintaining comprehensive fault detection coverage.
Solution Approach 2:
The patent replaces complex diagnostic procedures with direct electrical detection mechanisms. The under-voltage detection circuit automatically identifies motherboard power switch defects, and the over-current detection circuit automatically identifies LCD cable shorts, eliminating the need for manual troubleshooting steps and reducing the operational complexity for users.
Data Source
AI summary
A power switch includes an OC detection circuit, a UV detection circuit, and an OC indication circuit. The OC detection circuit detects an over-current in the power switch, provides an OC flag in a first state when no over-current is detected, and provides the OC flag in a second state when the over-current is detected. The UV detection circuit detects an under-voltage in the power switch, and provides a UV fault indication in a third state when the under-voltage is not detected, and provide the UV fault indication in a fourth state when the under-voltage is detected. The OC indication circuit provides an OC fault indication in the third state when the over-current flag is in the first state, and provides the OC fault indication in a fifth state when the over-current flag is in the second state. The UV fault indication and the OC fault indication are configured in a wired-or to provide a common fault indication.