Mitsubishi Electric Corporation

Hiroshi Ikarashi

Shingo Tsuda

Akihiko Iwata

Takeshi Morimoto

Taichiro Tamida

Teruaki Fukuoka

Hideyasu Machii

Hiroyuki Nakamura

Masato Matsubara

Shuji Wakaiki

Futoshi Okawa

Naoki Takigawa

Yoshimichi Saito

A laser beam generation device includes power supply units, LD modules, a combiner, and a control device. The LD modules receive currents from the power supply units, and output laser beams. The combiner collects the laser beams and outputs one laser beam. The control device generates control signals such that power of the laser beam becomes a laser output setting value and such that the currents become current command values. Phases of pulses of the control signals are shifted from each other by 60 degrees.

Laser beam generation device and laser processing apparatus including the same

A first drive circuit is connected to a first end of a primary winding of a pulse transformer. A second drive circuit is connected to a second end of the primary winding of the pulse transformer. A voltage clamp unit clamps a voltage of a semiconductor element at a specified voltage when a voltage output from a secondary winding of the pulse transformer is negative. A current detection circuit detects current flowing through the semiconductor element and outputs a detection signal. A control circuit controls the first drive circuit and the second drive circuit based on the detection signal. A current limiting circuit imposes a limit on current flowing through the primary winding of the pulse transformer based on the detection signal.

Gate drive circuit and power conversion device

A laser diode driving power source of a laser machining device that radiates laser light emitted from an LD to a workpiece to machine the workpiece includes a power converter including a switching device, to supply a current to the LD, and a control unit to control a switching operation of the switching device. A value smaller than a value that is n times a time constant for laser machining is set as a switching period of the switching device in the control unit, the n is larger than 1, and the time constant for laser machining is a value obtained by dividing a surface roughness required for machining of the workpiece by a moving velocity of the workpiece.

Laser diode driving power source and laser machining device

A laser diode-driving power supply includes a constant current source that supplies current to LDs, a switching element connected in parallel to the LDs, and a control unit that controls the constant current source and performs on-off control of the switching element. The control unit compares a first current command value and a second current command value for controlling current output from the constant current source, and when the second current command value input after the first current command value is smaller than the first current command value, applies to the LDs a voltage in the range of a voltage at which current flows through the LDs to a voltage less than the lasing threshold of the LDs when there is no output from the LDs.

Laser diode-driving power supply and laser machining apparatus

In a power converter apparatus, a first power converter circuit is configured of first power semiconductor devices, and a second power converter circuit is connected in parallel to the first power converter circuit, and is configured of second power semiconductor devices. A control circuit generates a control signal for controlling each power semiconductor device of the first and second power converter circuits. A timing control signal generator circuit compares a first amount of current flowing through the first power semiconductor devices with a second amount of current flowing through the second power semiconductor devices, and generate a timing control signal for controlling a timing of a rise or a fall of each of the control signals inputted to the first and second power converter circuits, based on a comparison result. A timing correction circuit controls the control signals to correct the timing of the rise or the fall thereof.

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Tokyo, Japan

Hiroshi Ikarashi