Semiconductor laser unit driving power supply with over-temperature protection function

Abstract

A semiconductor laser unit driving power supply with an over-temperature protection function comprises a precise reference source, a temperature detector, a temperature controller and a constant flow source driver, wherein the precise reference source provides precise reference voltage for the temperature detector and the constant flow source driver, the temperature detector detects temperature of a semiconductor laser unit and inputs a temperature signal to a temperature control system to generate a temperature control signal, and the temperature control signal controls the constant flow source driver to output a current. When the temperature is detected to be higher than or equal to T0, current of semiconductor laser unit is reduced, and therefore heat productivity and temperature of the semiconductor laser unit are reduced, and the semiconductor laser unit is effectively protected. When the temperature is detected to be lower than T0, driving current of the semiconductor laser unit stays the same.

Description

technical field [0001] The invention relates to a driving power supply for a semiconductor laser, in particular to a driving power supply for a semiconductor laser in a battery-driven portable device. Background technique [0002] Semiconductor laser is a kind of electroluminescent device, which has the advantages of small size, long life, easy modulation, simple structure, pumping by current injection and high conversion efficiency, and is widely used in portable devices such as miniature laser projectors and portable lasers . However, when the semiconductor laser works continuously, the laser itself will generate a lot of heat. Due to the limitation of the size and weight of the portable device, there is not enough heat sink for the laser to dissipate heat, resulting in an increase in temperature, which will affect the power and life of the laser. important impact, or even damage the laser. Therefore, in order to ensure the life and reliability of the semiconductor laser...

AI Technical Summary

Problems solved by technology

Although some existing over-temperature protection circuits can realize the over-heat protection function of semiconductor lasers, the implementation is more complicated and the cost is higher. These over-temperature protection circuits often require complex temperature detection sensors and microprocessors

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