High current semiconductor laser drive power and its control method

Abstract

The invention relates to a laser power supply. The invention discloses a control method for driving a power supply of a high-current semiconductor laser, including a modular current output circuit, a control circuit, and an expansion interface. The modular current output circuit is used to output a large current Modularization, for different output current requirements, increase or decrease the DC-DC module on the expansion interface to obtain the required working current; the control circuit is used to control the DC-DC module according to the large current output circuit and laser working requirements The bus is controlled by output voltage, output current, output enable, slow start, slow close, and the management and control of the keyboard and LCD. Method: first initialize each control port, control the display screen and display the working interface; then enter the main loop program to scan the keyboard; and execute the corresponding key processing subroutine. The invention can flexibly expand the output stage power module, and has the characteristics of small volume, high efficiency, stability and reliability.

Description

technical field [0001] The invention relates to the technical field of laser power supplies, in particular to a control method for driving power supplies of high-current semiconductor lasers. Background technique [0002] Before the present invention was made, the structure of the output circuit of the high-current semiconductor laser driving power supply was fixed and not expandable, and the output current value could not be flexibly increased or decreased as required. The circuit block diagram of the whole machine is as follows Figure 4 shown. Its circuit is mainly composed of high frequency transformer, PWM controller, field effect transistor, insulated gate bipolar transistor (IGBT) and other discrete components. Figure 4 The converter in it converts the DC voltage into a high-frequency AC voltage, and plays the role of isolating the output part from the input grid. The oscillation frequency of the oscillating circuit in the converter is generally only 20-200KHz, so i...

AI Technical Summary

Problems solved by technology

Due to the limitation of the maximum current of a single output device, the output current of the whole machine is limited

Moreover, the overload capacity of the output device used is weak. When the power supply is short-circuited by overvoltage or overcurrent, the device is prone to damage, or a more complicated protection circuit is required, which leads to an increase in the failure rate of the whole machine.

[0003] In summary, due to the circuit structure of the semiconductor laser drive power supply in the prior art, there are problems such as inflexibility in use, difficulties in production debugging and maintenance, large volume, and low efficiency.

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