Mixed-mode control of multiphase interleaved parallel circuit for pulsed laser diode driving

Area of Science:

• Electrical Engineering
• Power Electronics
• Laser Technology

Background:

• Switching power supplies are increasingly used for lasers due to efficiency and size.
• Challenges exist in achieving fast response, current flatness, and high accuracy simultaneously.
• Existing designs struggle with optimal performance under varying load conditions.

Purpose of the Study:

• To propose a novel mixed-mode control strategy for switching power supplies used in laser applications.
• To address the difficulties in achieving short rise time, current flatness, and high accuracy.
• To enhance the stability and efficiency of laser power supplies.

Main Methods:

• Implementation of a mixed-mode control combining burst-mode voltage control and dual-loop current control.
• Utilizing multiple interleaving parallel circuits for balanced current distribution.
• Employing a control mode switching mechanism based on output pulse requirements.
• Validation through a simulation model and a multiphase interleaved parallel circuit.

Main Results:

• The proposed mixed-mode control effectively reduces the rise time of the laser power supply.
• Stable output current is ensured, with balanced current distribution across parallel branches.
• The system demonstrates improved performance in both light-load and pulsed operation states.
• Experimental validation confirms the efficacy of the developed control scheme.

Conclusions:

• The mixed-mode control strategy offers a viable solution for high-performance laser power supplies.
• This approach overcomes limitations of traditional switching power supplies in laser applications.
• The developed method enhances system stability, accuracy, and response speed.
• Further research can explore optimization for specific laser types and power levels.