Digital large power semiconductor laser power supply

A laser power supply and semiconductor technology, applied in semiconductor lasers, lasers, laser parts and other directions, can solve the problems of unsatisfactory stability, reliability and safety, high-power semiconductor lasers are expensive, and laser service life is shortened, etc. Achieve the effect of enhancing power output capability, improving power efficiency, and high power stability

Active Publication Date: 2012-01-04
SUZHOU INST OF BIOMEDICAL ENG & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

High-power semiconductor lasers are expensive, and their output wavelength and power are closely related to the driving current and junction temperature. At the same time, various transient voltage or current spikes such as surge current and power grid impact can easily damage the laser and shorten its service life. , so there is a high requirement for the driving power of the semiconductor laser
[0005] The traditional pure analog laser power supply is inconvenient to operate and the linear control is not good. The existing high-power semiconductor laser power supply has complex structure, large volume, and unsatisfactory stability, reliability and safety. shortened service life, etc.

Method used

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  • Digital large power semiconductor laser power supply
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  • Digital large power semiconductor laser power supply

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] see figure 1 As shown, a digital high-power semiconductor laser power supply includes a power supply unit 1, an interface unit 2, a main control unit 3, a constant current unit 4, a temperature control unit 5 and a current detection unit 6;

[0034] The power supply unit 1 includes a 220V AC to DC 24V power supply module 101, and the 220V AC to DC 24V power supply module 101 is respectively connected to a level conversion module 102 and a DC 24V to DC 5V adjustable module 103; 220V AC to DC 24V The power supply module 101 converts AC 220V into DC 24V for direct power supply to fans, etc.; the level conversion module 102 converts DC 24V voltage into the required voltage for the main control unit 3 and interface unit 2; DC 24V to DC 5V is adjustable The module 103 provides power to the constant current unit 4, and supplies power to the laser after constant current.

[0035] Described interface unit 2 comprises serial port 201, keyboard input 202, memory 203 and display u...

Embodiment 2

[0051] See attached figure 2 , the multi-channel switch output signal Icontrol, divided by R35 and R43, is input to the non-inverting terminal of the op amp, and the output of the op amp drives the N-channel FET Q12 to work through the complementary push-pull circuit composed of Q10 and Q14. The model of Q12 is IRF3205. Its conduction resistance is 8mΩ, the drain-source voltage can withstand 55V, and the maximum conduction current is 110A. The conduction current can be controlled by controlling the conduction status of Q12. R44 is a current sharing resistor and a sampling resistor. After feedback Resistor R46 is connected to the inverting terminal of the operational amplifier to form a negative feedback network, so that the current is balanced and stable, and the attached figure 2 Only one of the current equalizing circuits is given in this example. In this example, six circuits are connected in parallel, so that the output current is 0-60A, the ripple and noise are less tha...

Embodiment example 3

[0054] see Figure 4 As shown, in the switching power supply module circuit, two 200W VICOR modules V24B5T200BL are connected in parallel, the input voltage range is 19 V -36 V DC signal, the output voltage is 5 V adjustable DC signal, and the output power is 400W. The two modules pass The PR pins are connected in parallel, and the PC pin is the module control pin. When the PC pin voltage is lower than 2.3V, the module does not work. By adjusting R66, the output voltage of the module can be adjusted at 1.5-5V to directly provide power to the constant current unit. .

[0055] see Figure 5 As shown, POWER_ON is connected to the general-purpose IO pin of the controller. When it is at high level, transistor Q22 is turned on, optocoupler U19 and U21 are turned on, PC1 and PC2 output low level, and the module does not work. When POWER_ON is at low level Normally, the triode is off, PC1 and PC2 are in a high-impedance state, and the module works normally.

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PUM

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Abstract

The invention discloses a digital large power semiconductor laser power supply which comprises a power supply unit, a master control unit, a constant current unit, a temperature control unit, a current detection unit and an interface circuit. Through the interface circuit, work current and power size of a semiconductor laser are arranged, a control signal is sent to the constant current unit by amain controller through a D / A converter, and the work current of the semiconductor laser is stabilized. The temperature control circuit adjusts a semiconductor cooler to work, operating temperature of the semiconductor laser is restricted to a certain range, and output of the laser is stabilized. Through sampling voltage of two ends of a sampling resistor, the current detection circuit detects work current of the laser and monitors work state of the semiconductor laser. The power supply in the invention has the advantages of simple structure, large output power, high stability, easy operationand the like, and can be widely applied to semiconductor lasers of various powers and output wavelengths.

Description

[0001] technical field [0002] The invention relates to the fields of electronic industry and photoelectric technology, and relates to a semiconductor laser, in particular to a digital high-power semiconductor laser power supply. Background technique [0003] High-power semiconductor lasers are widely used in medical fields such as skin treatment, surgical treatment of tumors, and optical acupuncture. In addition, high-power lasers are also widely used in industrial production and military defense industries, such as material processing and laser ranging. [0004] High-power semiconductor lasers require dedicated power sources to drive them. High-power semiconductor lasers are expensive, and their output wavelength and power have a lot to do with the driving current and junction temperature. At the same time, various transient voltage or current spikes such as surge current and power grid impact can easily damage the laser and shorten its service life. , so there are high...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S5/042
Inventor 张龙武晓东高静戴仙金
Owner SUZHOU INST OF BIOMEDICAL ENG & TECH
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