Independent Peltier Elements for Laser Diode Thermal Control
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Solution Overview
Problem
Conventional Peltier cooler systems face reduced power supply efficiency and reliability when operating over a wider temperature range, particularly in military laser diode applications, as they require increased temperature differentials, leading to compromised performance and longevity.
Innovation Solution
A Peltier effect heat transfer system with electrically isolated semiconductor elements connected in series and parallel, featuring a controller that independently controls each element, allowing for variable current application and adaptive temperature management using multiple temperature sensors and look-up tables to maintain the laser diode chip within a specified temperature range across varying ambient conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single Peltier cooler is used to maintain laser diode chip temperature, then the temperature can be controlled within a specified range, but the operating temperature range is limited and power efficiency decreases when operating over wider temperature ranges
Solution Approach 1:
The Peltier cooler is divided into multiple independent Peltier elements (first Peltier element, second Peltier element, etc.), each capable of being independently controlled. This segmentation allows the system to activate only the necessary elements based on ambient temperature conditions, maintaining temperature control efficiency while extending the overall operating temperature range.
Solution Approach 2:
The system dynamically selects and activates specific Peltier elements based on ambient temperature conditions. The controller adjusts which elements are active and in what configuration (series or parallel) depending on the temperature range, optimizing power efficiency across different operating conditions while maintaining the laser diode chip within its specified temperature range.
2Adaptability or versatility
If multiple stage Peltier coolers are used to increase temperature differential, then the operating temperature range is extended, but power supply efficiency is reduced and dissipated power increases
Solution Approach 1:
Instead of using multiple stages of Peltier coolers connected in series, the patent uses multiple independent Peltier elements that can be selectively activated. This approach achieves the same temperature differential capability while avoiding the cumulative power losses associated with multi-stage systems.
Solution Approach 2:
The system activates only the necessary number of Peltier elements required to achieve the desired temperature differential, rather than always operating all elements or multiple stages. This partial action approach maintains temperature control while minimizing power consumption and improving power supply efficiency.
3Adaptability or versatility
If multiple stage Peltier coolers are used to operate over wider temperature ranges, then the temperature differential is increased, but reliability of the Peltier cooler is reduced
Solution Approach 1:
The system uses multiple independent Peltier elements where each element operates within its optimal temperature range. This segmentation prevents any single element from being subjected to excessive temperature differentials that would reduce reliability, while the combination of elements achieves the overall extended temperature range capability.
Solution Approach 2:
The controller dynamically changes the operating parameters (which elements are active, their connection configuration) based on ambient temperature conditions. This ensures that each active Peltier element operates within safe and reliable parameter ranges, preventing degradation and extending the overall system reliability across wide temperature ranges.
4Device complexity
If a fixed reference voltage module is used to control Peltier cooler temperature, then the control is simple, but the system cannot adapt to varying ambient temperature conditions efficiently
Solution Approach 1:
The control system dynamically selects and activates specific Peltier elements based on ambient temperature sensor readings. This dynamic adaptation allows the system to efficiently handle varying ambient temperature conditions while maintaining relatively simple control logic through predefined activation rules for different temperature ranges.
Solution Approach 2:
The system uses temperature sensors to continuously monitor both the laser diode chip temperature and ambient temperature. This feedback information is used by the controller to adjust which Peltier elements are active, creating an adaptive control system that responds to changing conditions while maintaining temperature control within the specified range.
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 solution enhances the operating range and power efficiency of laser transmitters, reduces thermal resistance, and increases reliability by selectively activating specific heat transfer elements, thereby maintaining the laser diode chip's temperature stability and extending the system's operational temperature range.
Implementation Method 1
a plurality of Peltier effect heat transfer elements, and wherein the heat transfer elements are independent such that each heat transfer element can be activated so as to yield Peltier effect heat transfer independently of each other heat transfer element
Data Source
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AI summary
A Peltier effect heat transfer system (208) comprising: a plurality of heat transfer elements (301-308); wherein each heat transfer element (301-308) comprises at least one semiconductor element pair arranged to yield Peltier effect heat transfer, each semiconductor element pair comprising a P-doped semiconductor element (408) and an N-doped semiconductor element (410); and the heat transfer elements (301-308) are independent such that each heat transfer element (301-308) can be activated so as to yield Peltier effect heat transfer independently of each other heat transfer element (301-308).