Laser Booster Circuit Cutoff for Unintended Emission Protection
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Solution Overview
Problem
Conventional distance measurement devices face issues with unintended high-power laser emission due to transistor shorts in booster circuits, leading to unsafe light conditions.
Innovation Solution
A laser light emitting device with a booster circuit, current detection, determination, and relay sections to monitor and cut off abnormal DC current, preventing unsafe laser emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a booster circuit is used to increase laser output power, then the laser emission power is improved, but the risk of unintended high-power emission due to transistor shorts increases
Solution Approach 1:
The relay section is configured to cut off DC current supply to the booster circuit before abnormal high-power emission can occur. By monitoring current values and preemptively interrupting power supply when abnormalities are detected, the system prevents unintended high-power laser emission while maintaining normal high-power operation when safe
Solution Approach 2:
The current detection section continuously monitors the DC current flowing through the booster circuit and provides feedback to the determination section. This feedback mechanism enables real-time detection of abnormal current conditions that could lead to unsafe emission, allowing the system to dynamically adjust power supply based on actual operating conditions
2Reliability
If current monitoring and relay sections are added to prevent abnormal emission, then safety is improved, but the device complexity increases
Solution Approach 1:
The relay section acts as an intermediary component between the DC power supply and the booster circuit. By inserting this intermediate control element, the system can safely interrupt power supply without requiring complex redesign of the core laser emission circuitry, thus adding safety while minimizing overall system complexity
Solution Approach 2:
The determination section automatically compares detected current values against predetermined thresholds and autonomously controls the relay section to cut off power when abnormalities are detected. This self-service capability eliminates the need for external monitoring systems or complex control algorithms, maintaining simplicity while ensuring safety
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Prevents abnormal light emission by cutting off DC current when it exceeds normal levels, ensuring compliance with safety standards and maintaining device reliability.
Implementation Method 1
a booster circuit that boosts a DC voltage supplied from the DC power supply via a main wiring connected to a positive electrode of the DC power supply and supplies the boosted DC voltage to the laser diode
Implementation Method 2
a laser diode, a DC power supply, a booster circuit that boosts a DC voltage supplied from the DC power supply
Implementation Method 3
a light receiver that receives reflected light of the laser light emitted from the laser diode reflected by an object
Data Source
AI summary
A laser light emitting device includes a laser diode, a DC power supply, a booster circuit that boosts a DC voltage supplied from the DC power supply via a main wiring connected to a positive electrode of the DC power supply and supplies boosted DC voltage to the laser diode, a drive wiring that connects the main wiring to a negative electrode of the DC power supply, a drive circuit having a switch that switches between a conducted state and a non-conducted state of the laser diode, a current detection section that detects a current value of DC current flowing on the main wiring in a direction from the DC power supply to the laser diode, a determination section that judges whether the current value is normal or abnormal, and a relay section that cuts off supply of the DC current depending on a determination result of the determination section.