Laser Power Control IC for Reservoir Capacitor Burst Charging
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Solution Overview
Problem
Laser systems, particularly Time of Flight (ToF) systems, face inefficiencies in managing energy use due to high power draws during short periods, necessitating precise control of energy delivery to optimize performance and safety.
Innovation Solution
Implementing a power control system that includes a stand-alone power control IC to manage energy delivery to VCSELs or other lasers, using capacitors for reservoir charging and discharging, and integrating power circuitry with laser drivers to regulate optical power based on indirect optical and electrical measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If high power is drawn during illumination bursts, then the laser can provide sufficient illumination for accurate 3D capture, but the system experiences excessive peak power consumption and in-rush currents
Solution Approach 1:
The reservoir capacitor is charged in advance during low-power intervals between illumination bursts, storing energy that can be rapidly discharged during the actual illumination period. This preliminary energy storage allows the system to deliver high peak power when needed without requiring continuous high power input, thus resolving the contradiction between high illumination intensity and excessive peak power consumption
Solution Approach 2:
The system dynamically changes the power delivery parameters by switching between charging mode (building energy in capacitor) and discharging mode (delivering energy to laser). The power control IC adjusts the charge/discharge characteristics of the reservoir capacitor to match the illumination requirements, enabling high instantaneous power delivery while maintaining lower average power consumption
2Reliability
If precise control of energy delivery is implemented, then system performance and safety are improved, but the device complexity increases due to additional power control circuitry
Solution Approach 1:
A stand-alone power control IC is introduced as an intermediary device between the power source and the laser driver. This dedicated controller manages the reservoir capacitor charging and discharging, providing precise energy delivery control while isolating the complexity from the main system. The intermediary handles the complex power management functions, keeping the overall system design manageable
Solution Approach 2:
The power control function is segmented into a separate stand-alone IC module rather than being integrated into the main laser driver or system controller. This segmentation allows the power control logic to be developed, tested, and optimized independently, reducing the complexity burden on the main system while still providing precise energy delivery control for improved reliability and 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
Enables precise control of energy delivery, ensuring safe and efficient operation of ToF systems by minimizing in-rush currents and reducing peak power consumption, thus enhancing system performance and safety.
Implementation Method 1
controlling the charging and discharging characteristics of a capacitor used in regulating and the managing power of a laser source
Data Source
AI summary
A device for managing power of a laser source in a laser-based apparatus includes switched-mode power controller circuitry. The power controller circuitry further includes a controller output configured to be coupled to reservoir capacitor of a laser source to provide a first mode of regulating charging of the reservoir capacitor between illuminations of the laser source and a second mode of regulating charging of the reservoir capacitor during illuminations of the laser source.