Constant current driver of digital semiconductor laser

Abstract

The invention relates to a constant current driver of a digital semiconductor laser, belonging to the technical field of electronic equipment. The structure of the constant current driver comprises a front panel (1), a central processing unit (CPU) STC89C51 (2), a button input circuit (3), an LED indicating lamp output circuit (4), a serial communication circuit (5), an A / D converting circuit (6), a D / A converting circuit (7), a power feedback circuit (8), a current feedback circuit (9), a time delay soft start circuit (10), a current output circuit (11) and a display module (12). The constant current driver has the output current of 0-2A, adopts negative feedback structure, effectively improves the output stability, and has the short-term stability being lower than 38ppm; two driving ways which are constant current and constant power are provided by the constant current driver, so that the constant current driver is convenient for use on different occasions; the constant current driver has the protecting functions such as current limitation, soft start, time delay and the like, so as to effectively guarantee the safety of the laser; and program can be controlled and upgraded in system.

Description

technical field [0001] The invention belongs to the technical field of electronic equipment, and in particular relates to a driving power supply for a semiconductor laser. Background technique [0002] With the rapid development of science and technology, semiconductor laser technology has been more and more widely used in various fields such as national economy and national defense construction. Compared with other lasers, semiconductor lasers have some incomparable characteristics. For example, semiconductor lasers can be excited by 2-3 volts, while common helium-neon lasers need to be excited by high voltage 1500 volts. The excitation method of the laser is much safer, and its efficiency is tens of times higher than that of ordinary lasers. In some measuring instruments, semiconductor lasers are used for illumination, which can meet the requirements of good monochromaticity, good coherence, and high beam alignment accuracy. In addition, semiconductor lasers are widely u...

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Problems solved by technology

[0005] Second, the output current provided by the driver should be stable enough, because small current changes will lead to great changes in optical power output and changes in device parameters (such as lasing wavelength, noise performance, mode jitter), these changes will directly endanger the device safe use of

[0006] Third, the driver must have sufficient protection measures to ensure the normal and safe operation of the laser, because some electrical transient projects, such as the instantaneous start-up of the power supply, the surge of the power supply, the radiation of the AC circuit, the electrostatic discharge generated by the user himself and Ungrounded soldering iron, etc., will cause the performance of the laser to deteriorate, or even damage the device

[0026] But above-mentioned product also only has the introduction of product performance, and has not seen the disclosure of concrete structure

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