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Reseach on Temperature Control System of High-power Laser Diode

Author: XiaPeng
Tutor: WangYi
School: Harbin Institute of Technology
Course: Electrical Engineering
Keywords: A semiconductor laser Thermoelectric cooler spice simulation Segmented control Programmable logic devices
CLC: TP273
Type: Master's thesis
Year: 2010
Downloads: 181
Quote: 0
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Abstract


High power semiconductor laser output power is affected by temperature changes, small temperature changes can lead to large fluctuations of the output power and wavelength, the threshold current, and life will also be affected. Therefore, the working temperature is very important for the semiconductor laser, semiconductor laser must provide a stable working temperature of thermostatic control of high power semiconductor laser is extremely important significance. Thermoelectric cooler is based on a Parr paste effect solid heat pumps, small size, light weight, no noise. Temperature control, thermal cooler semiconductor laser has unparalleled advantages, you can ensure that the semiconductor laser with high temperature stability. In a given ambient temperature conditions, the selection of the thermoelectric cooler is the key to the entire temperature control system effective temperature control. This paper analyzes the mathematical model of the thermoelectric cooler, and the corresponding SPICE simulation model. Simulation model, analyzes the operating characteristics of the thermoelectric cooler under different working conditions, and accordingly put forward a thermoelectric cooler selection. In view of the thermoelectric cooler in the heating and cooling conditions, with different operating characteristics. In order to obtain the best control effect, it must be segmented control. Temperature control system is a pure delay part of the first-order inertia determined by the method of theoretical analysis and experimental testing heating, refrigeration system under the conditions of the transfer function. For determining the transfer function, using SIMULINK simulation method determines the control parameters of the system in two stages of heating and cooling. Can guarantee the use of a segmented control system in the case of heating and cooling, have good temperature stability. For traditional temperature control circuit is not suitable for high power drive, this paper proposes an improved H-bridge circuit. H-bridge driver chip IR2110 upper arm bootstrap charge, making the H-bridge high supply voltage can be done to achieve a high power drive. Programmable logic device drive signal distribution and dead time control. From the device selection control method and the hardware and software design of the temperature control system of the semiconductor laser with a detailed theoretical analysis, simulation studies and experimental verification. Device selection method proposed temperature control method suitable for high power drive hardware system can achieve stable temperature control of semiconductor laser has a very good guide and practical value for the development of the semiconductor laser temperature control system.

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