EP4399774A1 - Dispositif de génération d'une tension de circuit de sortie de courant et système laser - Google Patents

Dispositif de génération d'une tension de circuit de sortie de courant et système laser

Info

Publication number
EP4399774A1
EP4399774A1 EP22769912.1A EP22769912A EP4399774A1 EP 4399774 A1 EP4399774 A1 EP 4399774A1 EP 22769912 A EP22769912 A EP 22769912A EP 4399774 A1 EP4399774 A1 EP 4399774A1
Authority
EP
European Patent Office
Prior art keywords
voltage
discharge
memory
circuit
switch
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP22769912.1A
Other languages
German (de)
English (en)
Inventor
Oliver KRUMM
Thomas Kaiser
Arno Jakubaschk
Thomas Notheis
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Trumpf Laser GmbH
Original Assignee
Trumpf Laser GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Trumpf Laser GmbH filed Critical Trumpf Laser GmbH
Publication of EP4399774A1 publication Critical patent/EP4399774A1/fr
Pending legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/0014—Monitoring arrangements not otherwise provided for
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
    • H01S3/06—Construction or shape of active medium
    • H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
    • H01S3/067—Fibre lasers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S5/00—Semiconductor lasers
    • H01S5/02—Structural details or components not essential to laser action
    • H01S5/026—Monolithically integrated components, e.g. waveguides, monitoring photo-detectors, drivers
    • H01S5/0262—Photo-diodes, e.g. transceiver devices, bidirectional devices
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S5/00—Semiconductor lasers
    • H01S5/04—Processes or apparatus for excitation, e.g. pumping, e.g. by electron beams
    • H01S5/042—Electrical excitation ; Circuits therefor
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0003—Details of control, feedback or regulation circuits
    • H02M1/0006—Arrangements for supplying an adequate voltage to the control circuit of converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/32—Means for protecting converters other than automatic disconnection
    • H02M1/322—Means for rapidly discharging a capacitor of the converter for protecting electrical components or for preventing electrical shock
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of DC power input into DC power output
    • H02M3/22—Conversion of DC power input into DC power output with intermediate conversion into AC
    • H02M3/24—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters
    • H02M3/28—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC
    • H02M3/325—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33507—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
    • H02M3/33523—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters with galvanic isolation between input and output of both the power stage and the feedback loop
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of DC power input into DC power output
    • H02M3/22—Conversion of DC power input into DC power output with intermediate conversion into AC
    • H02M3/24—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters
    • H02M3/28—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC
    • H02M3/325—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/3353—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having at least two simultaneously operating switches on the input side, e.g. "double forward" or "double (switched) flyback" converter
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/37—Converter circuits
    • H05B45/3725—Switched mode power supply [SMPS]
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
    • H05B45/59—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits for reducing or suppressing flicker or glow effects
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/09—Processes or apparatus for excitation, e.g. pumping
    • H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
    • H01S3/0912—Electronics or drivers for the pump source, i.e. details of drivers or circuitry specific for laser pumping

Definitions

  • the present invention relates to a device for generating a current driving voltage and a laser system, in particular a fiber laser system, in particular with such a device.
  • lasers Due to their coherent and high-energy optical radiation, lasers are an important and often indispensable tool in material processing, production and research.
  • lasers can generate high radiation energies and emit laser pulses with high energy densities that are suitable for separating or melting materials, for example, in order to initiate a joining process, for example.
  • Laser powers capable of separating and melting materials are typically a hazard to organic tissue, particularly living human tissue.
  • a particularly important safety factor here is the possibility of switching off the laser radiation and the associated switch-off time.
  • the laser radiation can be switched off by installing a mechanical shutter behind the active medium in which the laser radiation is generated, so that the laser radiation generated does not exit the laser.
  • fiber lasers in which the optical fiber, which derives the laser beam from the laser zone, is spliced to the laser diode or a laser diode array. There is effectively no optical path through the optical fiber or fibers that can be mechanically broken before the laser radiation exits the laser.
  • a known solution to the problem is to interrupt the laser beam with a mechanical interface attached to the exit end of the optical fiber.
  • the adapter includes a controllable mechanical shutter so that the laser radiation is interrupted at the end of the optical fiber.
  • a mechanical closure also has mechanical wear, so that the mechanical intermediate piece has to be serviced and replaced regularly.
  • the mechanical shutter is very slow with a shutter speed in the order of 100ms to a few seconds.
  • the laser beam often has to be re-coupled into an optical fiber after passing through the mechanical shutter.
  • Such adapters mentioned are correspondingly expensive and complex to adjust and carry the risk of a loss of performance due to the adjustment effort.
  • the object is achieved by a device for generating a current driver voltage for a current driver of a pump diode, preferably for a fiber laser pumped with the pump diode, with the features of claim 1.
  • a device for generating a current driver voltage for a current driver of a pump diode, in particular for a fiber laser pumped with the pump diode, comprising a voltage source for generating the current driver voltage, the voltage source comprising a primary side and a secondary side, the secondary side being derived from the The primary side is isolated, the primary side comprising primary power switches and the secondary side comprising a storage for electrical charge, wherein the voltage source is arranged to generate the current drive voltage at the storage by switching the primary power switches.
  • the invention is characterized by a discharge circuit that is set up to receive a discharge triggering voltage and to discharge the memory when the discharge triggering voltage assumes a predetermined value or range of values.
  • a current driver is a device that is suitable for providing a current.
  • a pump diode can be supplied with energy by the current of the current driver, which in turn can be used again for pumping a fiber laser.
  • energy By supplying energy to a pump diode, for example, laser radiation can be indirectly generated in this way, which is used for a large number of applications in technology and science.
  • the pump diode a population inversion of the electronic states is achieved by the electrical energy supplied, which relax to their basic electronic levels while emitting coherent radiation.
  • the current driver of the pump diode requires a voltage supply.
  • This voltage supply is realized by a voltage source that has a primary side and a secondary side.
  • the primary side and the secondary side can be electrically isolated from each other.
  • the two sides are electrically isolated if no electrical conduction is possible between the sides, but both sides can interact with each other.
  • both sides can be at different potentials, so that the respective parts of the voltage supply are ideally designed according to their respective tasks can become.
  • a potential separation within the meaning of the application can be a galvanic separation, for example.
  • the power source may include a transformer having a primary and a secondary, with the primary and secondary of the transformer being the primary and secondary of the power source.
  • a voltage applied to the primary side can produce a voltage on the secondary side via inductive coupling.
  • the ratio of the two voltages can be adjusted by the physical properties of the transformer, such as the number of turns, height, width and length of the transformer coils, and so on.
  • the primary side can include primary circuit breakers.
  • the primary power switches can be viewed as voltage controlled resistors that conduct or block current based on a received switching signal.
  • the primary power switches can be transistors or power transistors or MOSFETs or bipolar transistors or insulated gate bipolar transistors (IGBTs).
  • a transformer supply voltage can build up a voltage on the primary side of the transformer such that a secondary voltage is developed on the secondary side of the voltage source between two output terminals of the transformer.
  • a storage device for electrical charge is arranged between the two output terminals of the transformer of the voltage source and is charged indirectly by the transformer supply voltage.
  • the voltage that drops across the memory is the current driver voltage for supplying the current driver.
  • the memory has the task of stabilizing the current driver voltage for the current driver between the output terminals of the secondary side.
  • the secondary side of the Voltage source designed as a low-pass filter to smooth any switching signals or spikes.
  • diodes can also be used on the secondary side in order to ensure a specific current direction or a polarity of the storage device.
  • the electrical energy store can be discharged by the discharge circuit.
  • the discharge circuit receives a discharge trigger voltage.
  • the discharge triggering voltage assumes a predetermined value or range of values
  • the storage device is discharged by the discharge circuit, or a discharge of the storage device is triggered by the discharge circuit.
  • Receiving the discharge triggering voltage can consist, for example, in the discharge circuit being connected to a DC voltage supply or to a node of the circuit network at which a discharge triggering voltage is provided.
  • the predetermined value of the discharge triggering voltage can be 0V. If the discharge trigger voltage takes on this value, then the memory is discharged by the discharge circuit. In other words, the discharge circuit can be activated when the DC voltage supply is switched off or set to the value 0V.
  • the discharge circuit discharges the memory when the discharge trigger voltage is below or above a threshold value Discharge trigger voltage is.
  • the value range of the discharge triggering voltage can be between 0V and 5V or below 10V or above 20V.
  • the threshold value of the discharge triggering voltage is at least 0V and/or at most 30V.
  • the value range is to be understood in terms of amount.
  • the absolute value of the discharge triggering voltage can then be below a value.
  • the discharge trigger voltage can be less than 30V in magnitude, so that the discharge trigger voltage can actually be within an interval of -30V to +30V, so that the discharge circuit discharges the memory.
  • the discharge triggering voltage is preferably below a specific value, so that the discharging process is initiated when the DC voltage supply, which is used to provide the discharge triggering voltage, is switched off or fails.
  • the functionality of the discharging circuit can thus be controlled via a sort of inverse switch, which activates the discharging circuit when the DC voltage supply is deactivated.
  • the device can include a driver circuit for switching the primary power switches of the voltage source, the driver circuit including a switching element which is configured to receive a first switching signal and to switch the primary power switches of the voltage source based thereon.
  • a driver circuit generally prepares the switching process of a transistor in order to keep the switching time and the associated switching losses as short and low as possible.
  • a first switching element can be a voltage or current-controlled switch, for example a transistor.
  • the primary circuit breakers can be switched. Indirectly, therefore, a voltage supply can be provided by the voltage source by switching the first switching element, or the storage device for electrical energy is thus charged by switching the switching element of the driver circuit.
  • the first switching element is switched by a first switching signal.
  • a switching signal can be a voltage here, for example, in particular a square-wave voltage, or a sawtooth voltage or another voltage form that has a certain duty cycle. Such a switching signal enables the voltage source to be switched on and off periodically, for example.
  • the switching element switches based on the value of the switching signal.
  • the switching element can switch when the switching signal exceeds or falls below a specific value.
  • a common voltage supply can be used to supply the driver circuit and/or to supply or switch the discharge circuit.
  • This power supply can be implemented via a DC/DC converter, with switching of this power supply being made possible via a deactivation switch.
  • a DC/DC converter can be set up to receive a first control voltage and to provide an output voltage at an output of the DC/DC converter based on the first control voltage.
  • a DC/DC converter or DC voltage converter can generate an output voltage with a higher, lower or inverted voltage level from the first control voltage.
  • a deactivation switch may be configured to receive a second control voltage and to switch an electrical connection between the output of the DC/DC converter and the node based on the second control voltage.
  • the deactivation switch thus makes it possible to provide the output voltage of the DC/DC converter at the node for the discharge circuit.
  • a node here is in particular a point of the potential distribution of the circuit network which is at a specific potential.
  • a deactivation switch can be designed as an optocoupler.
  • An optocoupler is an optoelectronic component that includes a light emitting diode or laser diode and a phototransistor. When an input voltage is applied to the light-emitting diode, it starts to glow. The phototransistor receives the light from the light-emitting diode and can then switch an electrical connection so that an output voltage can be provided. The output voltage remains as long as the light-emitting diode emits light to the phototransistor. In this case, the input voltage can in particular be a second control voltage.
  • the optocoupler thus also provides potential isolation between the input circuit and the output circuit, since there is no electrical connection between the light-emitting diode and the phototransistor.
  • the output voltage of the DC/DC converter can be switched by the second control voltage as the output voltage of the deactivation switch.
  • the output voltage of the DC/DC converter is thus provided at the node in particular by the deactivation switch.
  • the discharge circuit can be connected to a node in order to receive the discharge trigger voltage.
  • the deactivation switch can be configured to establish the electrical connection between the output of the DC/DC converter and the node when the second control voltage has a first value or range of values, and to disconnect the electrical connection between the output and the node when the second control voltage has a second value or value range, which is different from the first value or value range.
  • the deactivation switch can in principle provide a conductive connection, but no output voltage of the DC/DC converter is provided, so that switching the deactivation switch has no effect.
  • the deactivation switch can make the electrical connection when the second control voltage has a value of 10V or has a value of more than 10V and disconnect the electrical connection when the second control voltage has a value of less than 5V or less than 10V, in particular a value of 0V.
  • the deactivation switch makes the electrical connection when the second control voltage has a value of less than 10V and disconnects the electrical connection when the second control voltage has a value of more than 10V.
  • the discharge circuit may include a second deactivation switch, a second switching element and a discharge resistor connected to a first terminal of the memory, wherein the second deactivation switch is configured to receive the discharge trigger voltage of the node and to switch the second switching element based on the discharge trigger voltage.
  • the memory is connected between two output terminals on the secondary side of the voltage source. Accordingly, a discharge resistor of the discharge circuit is connected to one of these output terminals. To a certain extent, a reservoir for the electrical energy of the storage device is provided via the discharge resistor.
  • the second deactivation switch receives the discharge trigger circuit of the node, which is provided, for example, by the first deactivation switch and the DC/DC converter at the node. With the second deactivation switch receiving the discharge trigger voltage, the second deactivation switch is controlled by the discharge trigger voltage.
  • the second deactivation switch can be designed as an optocoupler.
  • the second deactivation switch turns a second switching element on or off.
  • the second switching element is set up to switch an electrical connection between the discharge resistor and the second connection of the storage device. If the second deactivation switch creates an electrical connection between the discharge resistor and the second connection of the memory, the memory is discharged via the discharge resistor. If the second deactivation switch does not establish an electrical connection between the discharge resistor and the second connection of the memory, the memory is not discharged via the discharge resistor.
  • the second deactivation switch can be set up to turn on the second switching element in order to establish an electrical connection between the discharge resistor and a second terminal of the memory, so that the memory is discharged via the discharge resistor when the discharge trigger voltage at the node assumes the first value or value range, or the second deactivation switch can be set up to switch off the second switching element in order to separate the electrical connection between the discharge resistor and the second connection of the memory, so that the memory is prevented from being discharged via the discharge resistor when the discharge trigger voltage reaches the first value or value range does not accept and/or if the discharge trigger voltage is outside the first value or range of values.
  • the discharge circuit can include an indicator circuit which is set up to output an indicator signal with a first value or value range when the memory is discharged via the discharge resistor and to output the indicator signal with a second value or value range when the memory via the discharge resistor is not discharged .
  • An indicator circuit can, for example, tap a voltage in parallel with the second switching element. If by the second switching element an electrical connection is made and the memory is discharged via the discharge resistor, then the indicator circuit can detect this voltage and, for example, via an optocoupler or another potential-separated signal transmission path to an output, so that the discharge of the memory via the discharge resistor is displayed there.
  • the first control voltage and/or the second control voltage can be controllable by a control trigger, in particular the control trigger can be a test switch, door opener or an emergency stop switch, the memory being discharged via the discharge circuit when the control trigger is actuated.
  • a control trigger in particular the control trigger can be a test switch, door opener or an emergency stop switch, the memory being discharged via the discharge circuit when the control trigger is actuated.
  • an emergency stop switch or a door opener can interrupt the first control voltage via an integrated or separate emergency stop device.
  • control trigger is or includes an interface and/or a device by means of which the memory can be unloaded if necessary.
  • the control trigger is a control device of the laser system or is integrated into a control device of the laser system.
  • test switch can interrupt the second control voltage, so that the first deactivation switch turns off the first switching element of the driver circuit, so that the primary power switches of the voltage source are turned off.
  • isolated testing of the discharge circuit can thus be carried out without influencing other components, such as the DC/DC converter.
  • the discharge triggering voltage at the node is interrupted in this case, so that the second switching element of the discharge circuit is activated by the second deactivation switch when the threshold value is not reached is switched on, so that the memory can be discharged via the discharge resistor of the discharge circuit.
  • the memory can be discharged via the discharge circuit.
  • the control element of the driver circuit is switched off, so that the memory is no longer indirectly charged by the primary power switches.
  • the second deactivation switch can switch on the second switching element, so that the storage device is discharged via the discharge resistor.
  • the discharge circuit can be set up and preferably dimensioned to discharge the memory in less than 100 ms, preferably in less than 50 ms.
  • the discharge time is determined in particular by the size of the discharge resistance and the capacity of the storage device.
  • the discharge time is also called the reaction time in which the system switches off safely. In the system described, this can be less than 100 ms, for example 50 ms.
  • the time until no more laser beam exits the laser system is called the stopping time.
  • the stopping time can be over 300 ms, for example 350 ms.
  • a system with the power supply proposed here can have a stop time of less than 200ms, for example 100ms can be reached. Accordingly, increased safety is associated with a shortened stopping time.
  • the discharge circuit can be set up to discharge the memory down to a predetermined residual voltage.
  • the discharge circuit can be switched in such a way, in particular switched off by means of the second switching element, that the storage device has a predetermined residual voltage during discharging, in particular a residual voltage in the range from 0.1V to 20V, for example a residual voltage in the range from 0.1V to 10V, preferably a residual voltage of less than 10V.
  • the memory can be switched at a rate between 1 Hz and 100 Hz, in particular at a rate of 5 Hz.
  • the memory can be a capacitor and the capacitance of the capacitor can be less than 10000 pF, preferably less than 5000 pF, particularly preferably 4000 pF or 2000 pF or 1500 pF.
  • the current driver voltage can be highly stable and, at the same time, a high level of safety can be ensured through short discharge times.
  • the discharge circuit can be present redundantly in the device and/or the device can comprise at least two discharge circuits.
  • safety can be further increased and/or the discharge time can be further reduced.
  • a second discharge circuit discharges the memory when the first discharge circuit is defective. At the same time, such a defect can be noticed and output by the indicator circuit.
  • the device may have a clock that is configured to receive an input clock and the output voltage of the DC/DC converter from the node and, based on the output voltage of the DC/DC converter at the node, a clocked switching signal as the switching signal for switching the switching element to spend
  • the clock generator can be in the form of an optocoupler, for example, so that the output voltage of the DC/DC converter at the node is the supply voltage for the secondary side of the optocoupler. Accordingly, when the output voltage of the DC/DC converter at the node is interrupted, the clock generator is switched off, so that the clock generator does not output a clocked signal for the switching element. Accordingly, the switching element remains switched off. Accordingly, when the clock generator is switched on, the output voltage at the node is received by the switching element in time with the clock generator.
  • a further aspect of the invention is a laser system, in particular a fiber laser system, for providing a laser beam, comprising at least one pump diode, a device for generating a current driver voltage for a current driver of the at least one pump diode and a control trigger for deactivating the laser beam, the control trigger being set up for this purpose and providing a control trigger signal to the device to deactivate the laser beam, and wherein the control trigger signal causes the current drive voltage to be deactivated.
  • the laser beam is to be understood as an output laser beam coupled out of the laser system.
  • the control trigger is to be understood, for example, as an interface and/or a device of the laser system which can transmit a control trigger signal to the device for generating the current driver voltage in order to deactivate the laser beam if necessary.
  • control trigger signal can in particular be a switching signal.
  • a switching signal can include, in particular, the interruption or establishment of an electrical connection or can be in the form of a switching signal to a switch that switches or interrupts an electrical connection.
  • the device for generating the current driver voltage can be set up to deactivate the current driver voltage and/or the laser beam in less than 200 ms, preferably less than 100 ms, particularly preferably in less than 50 ms upon receipt of the control trigger signal.
  • the laser system is set up and/or designed in such a way that deactivation of the current driver voltage causes deactivation of the laser beam coupled out of the laser system.
  • the device for generating the current drive voltage can be one of the devices described above, the control trigger signal transmitted by means of the control trigger causing the memory to be discharged via the discharge circuit.
  • the control trigger signal causes a discharge trigger voltage in the predetermined value or range of values to be made available to the discharge circuit in order to discharge the memory.
  • control trigger causes the first control voltage (SIKDPS) to be interrupted, or the control trigger sends an interrupt signal to a switch which interrupts the first control voltage, so that the memory is discharged via the discharge circuit.
  • FIG. 1 shows a schematic representation of a first embodiment of the device
  • FIG. 2 shows a schematic representation of a second embodiment of the device
  • FIG. 3 shows a schematic representation of the voltage source and the memory
  • FIG. 4A, B shows a schematic representation of the driver circuit and the clock generator
  • FIG. 5 shows a schematic representation of the discharge circuit
  • FIG. 6 shows a further schematic representation of the discharge circuit
  • FIG. 7 shows a schematic representation of the discharge circuit and the indicator circuit
  • FIG. 8 shows a schematic overview circuit diagram of the device
  • Figure 9 is a schematic representation of a proposed laser system.
  • the device 9 for generating a current driver voltage V out for a current driver of a pump diode 99 is shown schematically in FIG.
  • a current driver voltage V out is to be made available by the voltage source 1 for the pump diode 99 .
  • the voltage source 1 comprises a memory 120, which can comprise a capacitor, for example, with which the current driver voltage V out is smoothed or otherwise conditioned in order to reliably supply the pump diode 99 with the current driver voltage.
  • the voltage source 1 and in particular the memory 120 can be discharged via a discharge circuit 7 .
  • the discharge circuit 7 can receive a discharge triggering voltage. If the discharge trigger voltage assumes a predetermined value or is within a predetermined range of values, then the memory 120 of the voltage source 1 can be discharged via the discharge circuit 7, so that the pump diode 99 no longer receives any voltage, or the voltage supply receives it as quickly as possible, for example within 100 ms or 50 ms , is interrupted.
  • the voltage source 1 has a primary side 10 and a secondary side 12, which can be electrically isolated from one another.
  • the voltage source 1 can therefore comprise a transformer with a primary side and a secondary side.
  • Primary circuit breakers (not shown) can be arranged on the primary side 10, through which an energy supply of the secondary side 12 can be achieved in a switchable manner.
  • FIG. 2 shows a general embodiment according to the invention, the voltage source 1 and the discharge circuit 7 being connected at least indirectly to a common node 30 from which a voltage is received.
  • this voltage can be called and be the output voltage of a DC/DC converter 5, on the other hand, this voltage can also be called the discharge triggering voltage.
  • the primary switching elements (not shown) of the voltage source 1 are switched by a driver circuit 2 .
  • the driver circuit 2 comprises a switching element (not shown), which can receive a switching signal and can switch the primary power switch of the voltage source 1 based thereon.
  • node 30 can at least indirectly receive an output voltage from the driver circuit. If the output voltage assumes a first value or value range here, the driver circuit 2 is switched, as a result of which the primary power switches are switched and the voltage source 1 is therefore operated. If the output voltage or now the discharge triggering voltage assumes a second value or range of values, the discharge circuit 7 is activated and the voltage source 1 is discharged. At the same time, the voltage source 1 is no longer operated. Accordingly, a certain complementary or inverse circuit property of the driver circuit 2 and the discharge circuit 7 is preferably implemented.
  • FIG. 2 also shows that node 30 receives a voltage from a first deactivation switch 3, which in turn is generated by a DC/DC converter 5 on the basis of a first control voltage SIKDPS.
  • the first deactivation switch 3 is controlled by a second control voltage Disable CO n. If the second control voltage Disable CO n switches the first deactivation switch 3 conductive, then the output voltage of the DC/DC converter 5 is received at the node 30 . If the first deactivation switch is non-conductive due to the second control voltage Disable CO n is switched on, or no output voltage is generated by the DC/DC converter, either the ground potential or an undefined potential is present at the node 30 .
  • the deactivation switch 3 integrates a function into the device 100 which makes it possible to discharge the voltage source 1 via the discharge circuit 7 if the first control voltage SIKDPS fails, for example in the event of a power failure.
  • the voltage source 1 is also discharged when a second control voltage Disable CO n is switched on or off, for example by a control trigger, such as a test switch for testing the discharge function.
  • a control trigger such as a test switch for testing the discharge function.
  • An alternative implementation possibility would be to replace the deactivation switch 3 with a logical AND gate, so that only an output voltage of the DC/DC converter 5 is present at the node 30 if both a first and a second control voltage Disable CO n are present .
  • the voltage source 1 can be quickly discharged via the discharge circuit 7 in order to increase the operational reliability of the device 1 in this way.
  • the voltage source 1 has a primary side 10 and a secondary side 12, with there preferably being an inductive coupling between the two sides.
  • the secondary side 12 also includes two output terminals 1200, 1202 between which a storage device for electrical charge 120 is arranged.
  • the memory 120 can be designed here, for example, as a capacitor whose capacitance is less than 10000 pF, preferably less than 5000 pF, particularly preferably 1500 pF.
  • the capacitance can be 4000pF or 2000pF or 1500pF.
  • Primary circuit breakers 100 are arranged on the primary side 10 of the voltage source 1 .
  • the primary power switches 100 are in the form of MOSFETs, which are optimized for conducting and blocking particularly high electrical currents and voltages. If the MOSFETs are switched on via a switching signal at the circuit input 1000, i.e. switched to be conductive, then the voltage V_IMC on the primary side 10 generates a voltage on the secondary side 12 due to the inductive coupling, as a result of which the memory 120 is charged.
  • the starting point for the considerations on which this structure is based is to enable the memory 120 to be switched off and discharged quickly. So far, in the event of a malfunction or an emergency, the charging process of memory 120 was only interrupted by interrupting the power supply V_IMC, so that the memory only no longer stores energy after a time constant that is determined by the capacity of memory 120 and thus interrupts the power supply of the current driver of the pump diode. To a certain extent, the memory had to be discharged via the pump diode or the consumer, so that a defined switch-off time could not be achieved.
  • the memory 120 can now also be discharged in a defined manner and quickly via the discharge circuit 7, as shown further below.
  • the driver circuit 2 for switching the primary power switches 100 of the voltage source 1 is shown in FIG. 4A.
  • the driver circuit 2 has a primary side 20 and a secondary side 22, the primary side 20 and the secondary side 22 being inductively coupled.
  • On the primary side 20 is in the present Embodiment arranged a switching element 200, which can be formed in particular as a transistor.
  • the transistor is a switch that can switch a supply voltage V SU ppiy of the primary side 20 on and/or off by means of a control voltage or a control current.
  • the switching element 200 receives a first switching signal.
  • the primary side 20 also includes, for example, two inductances connected in parallel, each of which is part of a transformer or an inductive coupling element.
  • the transformed voltage can be amplified by an amplifier and fed to the power switches 100 of the voltage source 1.
  • the amplifier can be embodied, for example, as a CMOS inverter, with the transformers generating a supply voltage for the CMOS inverters and a gain being able to be set by a gate voltage of the CMOS inverters.
  • primary side 20 can receive a supply voltage V SU ppiy , with the transformers in secondary side 22 inducing a voltage that can switch primary power switches 100 of voltage source 1 via an amplifier circuit. If the switching element 200 does not receive a switching signal, then no voltage is induced in the secondary side 22 of the driver circuit 2 either, so that the primary power switches 100 are not switched.
  • the switching signal of the switching element 200 can be provided, for example, by a clock generator 4, which is shown as an example in FIG. 4B.
  • the clock generator 4 has an input 40 which is supplied with a clock signal, for example with a square-wave voltage of a specific amplitude.
  • the clock generator 4 is provided with a voltage input 42 through which the clock generator 4 receives voltage. If the voltage is greater than a critical voltage or threshold voltage, the clock generator 4 can Output voltage or the supply voltage at its output 44 in time with the clock signal at the input 40. As a result, the switching element 200 can be switched, for example switched periodically.
  • the clock generator 4 can in particular also be designed as an optocoupler. If the supply voltage of the optocoupler falls below a threshold value, the optocoupler does not emit an output voltage, so that the memory 120 of the voltage source 1 is not loaded.
  • the clock generator 4 can in particular also be connected to the node 30 in this case.
  • the discharge circuit 7 is shown schematically in FIG.
  • the discharge circuit 7 has a second deactivation switch 75 which receives the discharge trigger voltage of the node 30 .
  • a second switching element 73 can be switched on the basis of the discharge trigger voltage received.
  • One end of the second switching element 73 is connected to a discharge resistor 72 , which in turn is connected to a terminal of the memory 120 .
  • the other end of the switching element 73 is connected to the other terminal of the memory 120 . If the switching element 73 is switched based on the received discharge trigger circuit at the deactivation switch 75, then an electrical connection of the terminals of the memory 120 can be established via the discharge resistor 72, so that the memory 120 is discharged via the discharge resistor 72. In the reversed switched state of the switching element 73, the storage device 120 is not discharged via the discharge resistor.
  • the deactivation switch 75 is a photocoupler that receives the discharge trigger voltage.
  • the switching element 73 interrupts the electrical connection between the discharge resistor 72 and the memory 120, which is connected to the connection terminals 1200, 1202.
  • the optocoupler 75 is deactivated, the electrical connection is closed by the switching element 73 until the memory 120 is discharged.
  • the transistor 77 serves to amplify the current and to provide a defined switching threshold for the switching element 73.
  • the device 9 can in particular also have an indicator circuit 76 which outputs an indicator signal or does not output it when the memory 120 is discharged via the discharge resistor 72 .
  • the indicator circuit 76 is designed as an optocoupler.
  • the optocoupler is connected in parallel with the second switching element 73 between the discharge resistor 72 and the second connection 1202 of the memory 120 . Part of the storage energy is always fed via the optocoupler, so that the storage device 120 is always slightly discharged through the discharge resistor 72 . This effect is accepted here.
  • an indicator switching element can be switched at the output of the optocoupler, through which an indicator voltage can be output.
  • the indicator voltage is a measure of the discharge current through the discharge resistor 72.
  • a discharge of the memory 120 can thus be triggered in a variety of ways:
  • the node 30 receives no voltage since the DC/DC converter 5 does not generate an output voltage.
  • the second deactivation switch 75 of the discharge circuit 7 is activated, so that the memory 120 is discharged via the discharge resistor 72 of the discharge circuit 7 .
  • clock generator 4 can also no longer generate a switching signal, so that driver circuit 2 is also no longer supplied with energy and memory 120 is no longer indirectly charged via primary power switch 100 .
  • the discharging of the memory 120 can also be triggered via the first deactivation switch 3 by the second control voltage Disable C on the first deactivation switch 3 is interrupted. Then no voltage is received at the node 30 either, so that the discharge circuit 7 is activated again and the memory 120 is discharged.
  • the storage device 120 can be discharged in less than 100 ms, preferably in less than 50 ms, by the discharge circuit. A particularly reliable operation of the device is thereby possible, in particular when the laser diode of a laser is operated with it.
  • FIG. 8 shows an overview circuit diagram of the device, which contains all the elements mentioned above.
  • a laser system 999 with the proposed discharge circuit is shown schematically in FIG.
  • the laser system 999 is a fiber laser system, for example, which includes at least one pump diode 99 .
  • the pump diode 99 is operated via a device 9 for generating a current driver voltage for a current driver and an associated current driver (not shown).
  • the device 9 receives a first control voltage SIKDPS, the pump diode 99 is energized via the current driver to provide a laser beam 990 .
  • This laser beam 990 is to be understood as meaning an output laser beam of the laser system 999 emerging from the laser system 999 .
  • pump laser radiation for example, is provided by means of the pump diode 99 in order to optically pump an active medium of the laser system 999 (not shown).
  • the active medium is part of an optical fiber (not shown) of the laser system 999.
  • the laser beam 990 in this case is the laser beam emerging from the optical fiber.
  • the laser system 999 has a control trigger 92 .
  • the control trigger 92 can transmit a control trigger signal to the device 9, thereby causing the current drive voltage to be deactivated and thus the laser beam 990 to be switched off.
  • the control trigger signal can be or provide a corresponding control voltage SIKDPS, for example an interruption of the first control voltage SIKDPS.
  • the device 9 of the laser system 999 can deactivate the current drive voltage and/or the laser beam 990 in less than 100 ms, preferably in less than 50 ms.
  • the device 9 can be designed according to the circuit in FIG. 8 for this purpose. Then, for example, by transmitting a control trigger signal to the device 9 , the memory 120 can be discharged via the discharge circuit 7 .
  • the control trigger signal can, for example, interrupt the first control voltage.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Power Engineering (AREA)
  • Optics & Photonics (AREA)
  • Plasma & Fusion (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Dc-Dc Converters (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Semiconductor Lasers (AREA)

Abstract

La présente invention concerne un dispositif pour générer une tension de circuit de sortie de courant (Vout) pour un circuit de sortie de courant d'une diode de pompage, en particulier pour faire fonctionner une diode de pompage d'un laser à fibre à diode de pompage, comprenant une source de tension (1) pour produire la tension de circuit de sortie de courant (Vout), la source de tension (1) comprenant un côté primaire (10) et un côté secondaire (12), le côté secondaire (12) étant isolé au plan galvanique du côté primaire (10), le côté primaire (10) comprenant des disjoncteurs primaires (100) et le côté secondaire (12) comprenant un accumulateur (120) pour la charge électrique, la source de tension (1) étant conçue pour générer la tension de circuit de sortie de courant (Vout) au niveau de l'accumulateur (120) par commutation des disjoncteurs primaires (100). Le dispositif est caractérisé par un circuit de décharge (7) qui est conçu pour recevoir une tension de déclenchement de décharge et pour décharger l'accumulateur (120) lorsque la tension de déclenchement de décharge prend une valeur ou se situe dans une plage de valeurs prédéterminée. L'invention concerne également un système laser à fibre à diode de pompage (999) comprenant un dispositif (9) de ce type pour générer une tension de circuit de sortie de courant pour un circuit de sortie de courant de la diode de pompage (99).
EP22769912.1A 2021-09-10 2022-08-26 Dispositif de génération d'une tension de circuit de sortie de courant et système laser Pending EP4399774A1 (fr)

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DE102021123547.2A DE102021123547A1 (de) 2021-09-10 2021-09-10 Vorrichtung zur Erzeugung einer Stromtreiberspannung und Lasersystem
PCT/EP2022/073800 WO2023036627A1 (fr) 2021-09-10 2022-08-26 Dispositif de génération d'une tension de circuit de sortie de courant et système laser

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EP (1) EP4399774A1 (fr)
KR (1) KR20240051275A (fr)
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DE102009011254A1 (de) * 2009-03-02 2010-09-09 Schwering & Hasse Elektrodraht Gmbh Frequenzrichter und Verfahren zur Herstellung eines solchen

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JP2006128374A (ja) * 2004-10-28 2006-05-18 Fanuc Ltd 半導体レーザ励起固体レーザ装置
JP5511225B2 (ja) 2009-06-03 2014-06-04 ローム株式会社 昇圧型スイッチング電源装置
CN106063057B (zh) * 2014-03-04 2019-07-05 Ipg光子公司 大功率光纤激光器安全控制系统
US10362644B1 (en) 2017-07-28 2019-07-23 Universal Lighting Technologies, Inc. Flyback converter with load condition control circuit
US10575377B2 (en) * 2017-11-22 2020-02-25 Semiconductor Components Industries, Llc Line ripple reducer
US11837848B2 (en) 2019-09-30 2023-12-05 Analog Modules, Inc. High PRF, high efficiency laser diode driver power supply

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DE102009011254A1 (de) * 2009-03-02 2010-09-09 Schwering & Hasse Elektrodraht Gmbh Frequenzrichter und Verfahren zur Herstellung eines solchen

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US20240215129A1 (en) 2024-06-27
KR20240051275A (ko) 2024-04-19
DE102021123547A1 (de) 2023-03-16
CA3230554A1 (fr) 2023-03-16
WO2023036627A1 (fr) 2023-03-16

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