Compact Laser Diode Driver with U-Channel Thermal Management
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Solution Overview
Problem
Laser diode drivers face challenges with high electrical resistance and thermal management issues, limiting their efficiency and reliability due to the inherent low impedance of laser diodes and the constraints of interconnecting cables and switching electronics.
Innovation Solution
The design incorporates a u-channel shaped member with a printed circuit board, capacitors, and a cooling system to reduce electrical resistance and thermal stress, featuring low impedance paths, improved thermal management, and a compact form factor, allowing for higher packing density and efficient thermal dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the driver electronics are designed with conventional layouts, then the electrical resistance is high, but the device occupies more area
Solution Approach 1:
The patent combines the driver electronics with the laser diode assembly into a single integrated unit. The driver is positioned immediately adjacent to the laser diode, eliminating separate interconnecting cables and reducing the overall footprint. This merging reduces electrical resistance by minimizing cable length while avoiding the need for separate housing space.
Solution Approach 2:
The patent transitions from a conventional planar layout to a three-dimensional integrated structure. The driver electronics are positioned in close proximity to the laser diode in multiple spatial dimensions, creating a compact assembly that reduces both area and electrical resistance simultaneously through optimized spatial arrangement.
2Productivity
If the driver area is reduced to increase packing density, then more drivers can be packed, but thermal management becomes difficult
Solution Approach 1:
The thermal management system is integrated directly with the driver electronics and laser diode assembly. Cooling channels and heat sinks are positioned immediately adjacent to heat-generating components, allowing efficient heat removal in a compact footprint. This integration enables high packing density while maintaining effective thermal management.
Solution Approach 2:
The patent introduces cooling channels and thermal interfaces as intermediary structures between the heat-generating driver electronics and the external cooling system. These intermediaries efficiently conduct heat away from compactly packed drivers, enabling high density without thermal overload.
3Area of stationary object
If interconnecting cables are made longer to connect drivers, then the driver area can be larger, but electrical resistance increases
Solution Approach 1:
The driver electronics are merged with the laser diode assembly, eliminating long interconnecting cables. The driver is positioned immediately adjacent to the laser diode, reducing cable length to minimal distances and thereby minimizing electrical resistance losses.
4Device complexity
If conventional switching electronics are used, then the device can be simpler, but electrical resistance and thermal issues increase
Solution Approach 1:
The switching electronics are integrated directly into the laser diode driver assembly, eliminating separate components and interconnections. This merging reduces electrical resistance by minimizing the number of connection points and cable lengths while maintaining the necessary switching functionality.
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
This approach significantly reduces electrical resistance, enhances reliability, and allows for a more compact and efficient laser diode driver system with improved thermal management, reducing resistive losses and parasitic inductance while maintaining high current density and voltage integrity.
Implementation Method 1
Each of the plurality of capacitors has a mounting surface mounted to the printed circuit board and an opposing heat transfer surface thermally coupled to the u-channel shaped member
Implementation Method 2
The laser drive unit includes a supply of cooling fluid coupled to each of the plurality of cooling plates
Data Source
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AI summary
A device includes a u-channel shaped member and a printed circuit board including a plurality of capacitors. Each of the plurality of capacitors has a mounting surface mounted to the printed circuit board and an opposing heat transfer surface thermally coupled to the u-channel shaped member. The device also includes an output cable coupled to the printed circuit board and a return cable coupled to the printed circuit board. The device further includes a control transistor disposed inside the u-channel shaped member and a current sensing resistor disposed inside the u-channel shaped member.