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Electrical current control device and electrical current control method

A technology of current control and power supply device, applied in circuits, electrical components, pulse duration/width modulation, etc., can solve problems such as inability to process, and achieve good lighting effects

Active Publication Date: 2018-08-03
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Therefore, with the constant current power supply device, when the current command value changes from a large value to a small value, a driving current larger than the current command value flows through the laser diode, so that proper processing cannot be performed.

Method used

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  • Electrical current control device and electrical current control method
  • Electrical current control device and electrical current control method
  • Electrical current control device and electrical current control method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0040] figure 1 It is a diagram showing the configuration of a laser diode power supply device including the current control device according to the first embodiment.

[0041] The laser diode power supply device 1 receives a three-phase AC power supply from a system power supply 2 , and flows a current corresponding to a current command value 4 a input from an external computer numerical control (CNC) device 4 to the light emitting unit 3 .

[0042] The light emitting unit 3 includes one or more laser diodes (Laser Diode: LD) 3a. When the light emitting unit 3 includes a plurality of laser diodes 3a, the plurality of laser diodes 3a are connected in series, in parallel, or in series and parallel.

[0043] The laser diode 3a is a current-driven element, and emits light with an intensity corresponding to the current. Therefore, the laser diode power supply device 1 can control the intensity of the light of the light emitting unit 3 by controlling the current flowing in the lig...

Embodiment approach 2

[0146] Figure 12 It is a diagram showing the configuration of a laser diode power supply device including the current control device according to the second embodiment. If the laser diode power supply device 130 according to Embodiment 2 is connected with the figure 1 For comparison, the laser diode power supply device 1 according to Embodiment 1 shown includes a power supply device 140 instead of the power supply device 10 .

[0147] The power supply device 10 shown in Embodiment 1 includes a step-down chopper unit 42 that steps down the DC voltage supplied from the DC conversion unit 41 .

[0148] The power supply device 140 shown in Embodiment 2 omits the step-down chopper unit 42 . When the laser output of the light emitting unit 3 is allowed to be small and the power supply capacity is small, the step-down chopper unit 42 can be omitted.

[0149] The power supply unit 140 includes: a transformer 141 that transforms the AC voltage supplied from the inverter unit 32 to ...

Embodiment approach 3

[0156] The structure of the laser diode power supply device including the current control device according to Embodiment 3, and the figure 1 The laser diode power supply device 1 according to Embodiment 1 shown may be composed of Figure 12 The laser diode power supply device 130 according to the illustrated second embodiment is the same, and thus illustration and description thereof will be omitted.

[0157] Figure 13 It is a flowchart showing the operation of the current control device according to Embodiment 3. Figure 14 It is a waveform diagram for explaining the operation of the current control device according to the third embodiment. exist Figure 14 In , the waveform of the current command value 4a, the waveform of the on-off control signal 23a, the waveform of the reactor current 45, and the waveform of the light emitting unit current 24 are shown.

[0158] If the timing t of the start of light emission indicated by the first light emission timing signal is reac...

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Abstract

Provided is an electrical current control circuit which, on the basis of an electrical current command value input from an external device, controls a light-emitting unit electrical current flowing from a power supply device to a light-emitting unit that includes one or a plurality of laser diodes. The circuit is equipped with a switching element connected in parallel to the light-emitting unit, and a pulse width modulation control circuit unit that performs pulse width modulation control of the switching element in the event that the output current output from the power supply device is greater than the present electrical current command value or the subsequent electrical current command value when the light-emitting unit electrical current has begun to flow, has ceased flowing, or is inthe process of flowing.

Description

technical field [0001] The present invention relates to a current control device and a current control method for controlling a current flowing in a light emitting unit including one or more laser diodes (Laser Diode: LD). Background technique [0002] Currently, in the processing field such as welding, cutting or marking of metals, CO 2 Laser or YAG (Yttrium Aluminum Garnet) laser. However, in recent years, the increase in output of semiconductor laser excitation type solid-state lasers or fiber lasers has been progressing. Therefore, in the above-mentioned processing field, the progress from CO 2 Replacement of laser or YAG laser to semiconductor laser excitation type solid-state laser or fiber laser. [0003] A laser diode is used as the laser oscillation source of the semiconductor laser excitation type. Generally, in a laser processing machine, in order to obtain a high output, a plurality of laser diodes are connected in series, in parallel, or series-parallel to f...

Claims

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Application Information

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IPC IPC(8): H01S5/062
CPCH01S5/062H03K7/08H01S5/0427H01S5/06216H01S5/06253H01S5/4025
Inventor 津田真吾森本猛民田太一郎桥本隆
Owner MITSUBISHI ELECTRIC CORP
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