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US 12,738,712 B2Granted
Laser oscillator and direct diode laser processing apparatus provided with same
AssigneePanasonic Intellectual Property Management Co., Ltd.
InventorsYuta Kurosaki, Masashi Samizo, Shunsuke Nakai
Life of this patent
Estimating the term…
Abstract
A control unit is configured to perform stop control of causing a power supply circuit to stop supplying a supply current, if the supply current is determined to exceed a threshold, determine whether an input alternating current (AC) voltage is abnormal, with supply of the supply current to the power supply circuit stopped by the stop control, and cause the power supply circuit to resume supplying the supply current, if the input AC voltage is determined not to be abnormal.
Claims11
A laser oscillator comprising:
- a light emission circuit including at least one laser diode;
- a power supply circuit configured to supply a supply current to the light emission circuit using an input alternating current (AC) voltage;
- a control unit configured to control the power supply circuit;
- a first voltage measurement unit configured to measure a voltage corresponding to the input AC voltage;
- a second voltage measurement unit configured to measure a voltage corresponding to a voltage of the light emission circuit;
- and
- a current measurement unit configured to measure a current corresponding to the supply current,
- wherein the control unit is configured to execute:
- current determination of determining whether the supply current exceeds a threshold, based on a value measured by the current measurement unit;
- first current control of:
- performing stop control of causing the power supply circuit to stop supplying the supply current, if the supply current is determined, in the current determination, to exceed the threshold;
- and causing the power supply circuit to continue supplying the supply current, if the supply current is determined, in the current determination, not to exceed the threshold;
- second current control of:
- determining whether or not the input AC voltage is abnormal, based on a value measured by the first voltage measurement unit, with supply of the supply current to the power supply circuit stopped by the stop control;
- causing the power supply circuit to resume supplying the supply current, if the input AC voltage is determined not to be abnormal;
- and causing the power supply circuit to keep stopping the supply of the supply current, if the input AC voltage is determined to be abnormal;
- and
- third current control of:
- determining whether the voltage of the light emission circuit is abnormal, based on a value measured by the second voltage measurement unit after causing the power supply circuit to resume supplying the supply current in the second current control;
- causing the power supply circuit to continue supplying the supply current, if the voltage of the light emission circuit is determined not to be abnormal;
- and causing the power supply circuit to stop supplying the supply current, if the voltage of the light emission circuit is determined to be abnormal.
18 more elements
A laser oscillator comprising:
- a light emission circuit including at least one laser diode;
- a power supply circuit configured to supply a supply current to the light emission circuit using an input AC voltage;
- a control unit configured to control the power supply circuit;
- a voltage measurement unit configured to measure a voltage corresponding to the input AC voltage;
- and
- a current measurement unit configured to measure a current corresponding to the supply current,
- wherein the control unit is configured to execute:
- current determination of determining whether the supply current exceeds a threshold, based on a value measured by the current measurement unit;
- first current control of:
- performing stop control of causing the power supply circuit to stop supplying the supply current, if the supply current is determined, in the current determination, to exceed the threshold;
- and causing the power supply circuit to continue supplying the supply current, if the supply current is determined, in the current determination, not to exceed the threshold;
- and
- second current control of:
- determining whether or not the input AC voltage is abnormal, based on a value measured by the first voltage measurement unit, with supply of the supply current to the power supply circuit stopped by the stop control;
- causing the power supply circuit to resume supplying the supply current, if the input AC voltage is determined not to be abnormal;
- and causing the power supply circuit to keep stopping the supply of the supply current, if the input AC voltage is determined to be abnormal,
- wherein the power supply circuit includes:
- a primary rectifier circuit configured to convert the input AC voltage into a direct current (DC) voltage and output the DC voltage;
- an inverter circuit including switching elements and being configured to convert the DC voltage output by the primary rectifier circuit into a primary AC voltage by switching operations of the switching elements;
- a secondary rectifier circuit configured to generate the supply current, based on a secondary AC voltage according to the primary AC voltage;
- and
- an isolation transformer configured to insulate the inverter circuit from the secondary rectifier circuit, and
- wherein the stop control is for turning off the switching elements and maintaining an off-state until the supply current reaches zero.
20 more elements
Dependencies are inferred from the claim text.