TEC-based laser temperature control circuit

Abstract

The invention relates to a TEC-based laser temperature control circuit. Conventional temperature control systems on the market are mainly in the forms of switch control and large-size industrial temperature control modules. A power supply circuit provides a +5V power input for a temperature control chip circuit. The temperature control chip circuit controls the direction and the size of peripheral TEC currents and receives feedback signals of a Wheatstone bridge circuit. An NTC provides feedback resistance of temperature change for the Wheatstone bridge circuit. According to the TEC-based laser temperature control circuit, the high-precision NTC is taken as a temperature sensor for measuring temperature signals, and a TEC is utilized as an execution unit for refrigerating / heating a laser. A Wheatstone bridge method is employed for measuring a voltage difference so that temperature drifting is inhibited. An MAX1978 chip provides difference amplification and TEC current driving for voltage difference signals.

Description

technical field [0001] The invention belongs to the technical field of temperature control, in particular to a TEC-based laser temperature control circuit. Background technique [0002] Semiconductor lasers play an irreplaceable role in military, medical, communication and other fields due to their high efficiency, small size, light weight, and low price. Since this type of laser needs to maintain a high and stable constant temperature state to ensure its output power and wavelength, the laser is more stable. Therefore, designing a temperature control system with high integration, small size and high stability has become an urgent problem to be solved. [0003] The main forms of temperature control systems on the market today are switch control and large industrial temperature control modules. Among them, using the switch to control the temperature is simple, convenient and easy to operate, but it also has certain limitations, that is, the temperature fluctuates greatly a...

AI Technical Summary

Problems solved by technology

Among them, the use of switches to control the temperature is simple, convenient, and easy to operate, but there are also certain limitations, that is, the temperature fluctuates greatly and cannot be stabilized at the set value.

The large industrial temperature control module has high precision and good stability, but it is expensive and bulky and is not suitable for small devices such as lasers.

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