Direct-Diode Laser Fault Diagnosis Using Current-Voltage Maps
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Solution Overview
Problem
Direct-diode laser oscillators face delays in fault detection, leading to additional faults during the diagnosis process, and existing systems fail to quickly identify the cause of faults, requiring extensive time for recovery.
Innovation Solution
A direct-diode laser oscillator with a power controller that performs fault diagnosis based on a previously divided diagnosis map, determining the region of applied current and voltage to rapidly identify fault causes and prevent further damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fault diagnosis is performed using conventional methods with current and voltage sensors, then fault detection capability is provided, but time delay occurs causing additional faults
Solution Approach 1:
The patent pre-divides the diagnosis map into multiple regions corresponding to different fault conditions before actual operation. When fault diagnosis is needed, the system simply determines which pre-defined region the current voltage pair falls into, eliminating the need for complex real-time analysis and reducing diagnosis time delay
Solution Approach 2:
The patent segments the continuous diagnosis map into discrete regions, each representing specific fault conditions. This segmentation transforms a complex continuous diagnostic problem into a simpler categorical classification problem, enabling faster fault identification
2Reliability
If conventional fault diagnosis methods are used, then fault detection is achieved, but extensive time is required for recovery due to inability to quickly identify fault causes
Solution Approach 1:
The system prepares the diagnosis map with pre-defined regions corresponding to different fault causes in advance. During operation, once a fault is detected, the system immediately identifies which pre-defined region applies, providing both fault detection and cause identification simultaneously, thus enabling rapid recovery without extensive diagnostic time
Solution Approach 2:
The patent implements a feedback mechanism where the determined region information is provided back to the control system. This feedback enables the system to immediately adjust operations based on the identified fault cause, accelerating the recovery process
3Device complexity
If fault diagnosis is performed without region-based classification, then simple detection is possible, but all possible causes must be considered requiring significant time for recovery
Solution Approach 1:
By dividing the diagnosis map into distinct regions, the patent transforms a complex diagnostic process requiring consideration of all possible fault causes into a simple region identification task. The segmentation inherently organizes fault causes by their electrical characteristics, providing both simplicity and speed
Solution Approach 2:
The patent uses changes in electrical parameters (current and voltage) to determine fault regions. By monitoring parameter changes and mapping them to predefined regions, the system achieves both simple detection and rapid fault cause identification
Data Source
AI summary
A direct-diode laser oscillator 1 can emit laser light to a laser processing head 3 based on the driving commands received from a system controller 5, which can control a laser robot 4 including the laser processing head 3. The direct-diode laser oscillator 1 includes the following: laser modules 10 each including a plurality of laser diodes connected in series or in parallel; a power supply circuit 20 for driving the laser modules 10 at a constant current, and a power controller 30 for controlling the power supply circuit 20 based on the driving commands and performing a fault diagnosis of the laser oscillator 1 based on which one of a plurality of previously divided regions of a diagnosis map the current and voltage applied to the laser modules 10 belong to.