WO2012070283A1 - Dispositif émetteur de lumière laser et appareillage d'éclairage de véhicule utilisant celui-ci - Google Patents

Dispositif émetteur de lumière laser et appareillage d'éclairage de véhicule utilisant celui-ci Download PDF

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Publication number
WO2012070283A1
WO2012070283A1 PCT/JP2011/067616 JP2011067616W WO2012070283A1 WO 2012070283 A1 WO2012070283 A1 WO 2012070283A1 JP 2011067616 W JP2011067616 W JP 2011067616W WO 2012070283 A1 WO2012070283 A1 WO 2012070283A1
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WO
WIPO (PCT)
Prior art keywords
voltage
semiconductor laser
light emitting
laser
emitting device
Prior art date
Application number
PCT/JP2011/067616
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English (en)
Japanese (ja)
Inventor
片岡　耕太郎
竹史 塩見
野村　勝
弘樹 五十嵐
太田　佳似
岩田　浩
Original Assignee
シャープ株式会社
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
Priority claimed from JP2010263593A external-priority patent/JP2012114338A/ja
Priority claimed from JP2010284287A external-priority patent/JP2012134281A/ja
Application filed by シャープ株式会社 filed Critical シャープ株式会社
Publication of WO2012070283A1 publication Critical patent/WO2012070283A1/fr

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    • 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
    • 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
    • H01S5/40—Arrangement of two or more semiconductor lasers, not provided for in groups H01S5/02 - H01S5/30
    • H01S5/4018—Lasers electrically in series
    • 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]
    • H05B45/375—Switched mode power supply [SMPS] using buck topology
    • 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]
    • H05B45/38—Switched mode power supply [SMPS] using boost topology

Definitions

  • the present invention relates to a light emitting device using a semiconductor laser, and more particularly to a laser light emitting device used for a lamp for a vehicle.
  • Patent Document 1 proposes a laser light source drive circuit for stably using a laser light source for a laser pointer, an information recording and reproducing apparatus, and the like.
  • Patent Document 2 discloses a lighting circuit for obtaining optimum illumination light with low power consumption when using a laser light source for general lighting fixtures such as room lights, street lights and flashlights.
  • a laser light source for general lighting fixtures such as room lights, street lights and flashlights.
  • series connection using a plurality of semiconductor laser elements it is disclosed to connect in parallel or to combine in parallel and in series since all are not lit if one is not lit.
  • Japanese Patent Publication Japanese Patent Application Laid-Open No. 06-275901 (September 30, 1994)
  • Japanese Patent Publication Japanese Patent Application Laid-Open No. 07-282609 (October 27, 1995)
  • semiconductor light emitting devices for example, LEDs
  • semiconductor lasers can also be used in the same manner.
  • semiconductor lasers there are several disadvantages when using a semiconductor laser as a light source for a vehicle headlamp.
  • the semiconductor laser device has large variations in characteristics, and it is difficult to connect a plurality of the plurality of dispersed semiconductor laser devices and drive them at one time.
  • the portion through which the effective current flows is smaller than that of the LED or the like, and thereby the equivalent resistance becomes high.
  • the semiconductor laser device when applied to a vehicle, when an unstable power supply is used, it is difficult to drive the semiconductor laser device to maintain a stable light emission operation. That is, when a storage battery for a vehicle is used as a power supply, the voltage of a generator connected in parallel to the storage battery is not constant, and a transient phenomenon occurs when other electrical equipment connected to the storage battery is turned on or off. For example, in the case of a storage battery with a rating of 36 V, the voltage fluctuates to about 28 V to 46 V. Also, for example, the voltage of a storage battery with a rating of 12 V fluctuates to about 9 V to 15 V.
  • the variation of the drive voltage (forward voltage) required for the semiconductor laser device to output a constant light occurs.
  • the equivalent resistance varies lower, a lower drive voltage is required, and when the equivalent resistance varies higher, a higher drive voltage is required, and stable light emission occurs in a battery with a large voltage fluctuation. Operation becomes difficult.
  • FIG. 9 is a circuit diagram of a conventional laser light emitting device similar to that of Patent Document 1.
  • Patent Document 1 is directed to a laser pointer, a laser light source in an optical pickup of an information reproducing apparatus, a laser light source of an optical communication apparatus, etc., and a small amount of light may be required.
  • one drive circuit 18 can be employed for one of the fifteen circuits, when the use of a plurality of semiconductor laser devices is considered in order to obtain the light amount necessary for the headlight for a vehicle, the above-described Face challenges.
  • the present invention has been made in view of the above-mentioned conventional problems, and it is an object of the present invention to provide a laser light emitting device which emits stable light suitable for vehicles.
  • the laser light emitting device includes a semiconductor laser device group in which a DC power supply and a plurality of semiconductor laser devices are connected in series, and a required driving voltage for driving the semiconductor laser device group. It is a laser light-emitting device provided with a chopper circuit which outputs by stepping up or down the voltage of the DC power supply, and the number of semiconductor laser elements included in the semiconductor laser element group is the semiconductor laser element driven by the chopper circuit. It is characterized in that the required drive voltage of the group is a number such as to maintain a step-up or step-down relationship with a predetermined voltage fluctuation of the DC power supply.
  • Patent Document 1 The technology described in Patent Document 1 is directed to a laser light source of a laser pointer, a laser light source in an optical pickup of an information reproducing apparatus, a laser light source of an optical communication apparatus, etc. (see paragraph [0022] of the same document). ), The technology in the case where the required amount of light may be small. Therefore, as shown in FIG. 1 of the same document, it is considered that one drive circuit is provided for one semiconductor laser.
  • the laser light-emitting device of the present invention provides a method of connecting a plurality of semiconductor laser elements having variations in characteristics and driving them at one time.
  • Patent Document 1 does not disclose a method of driving a plurality of semiconductor laser devices having variations in characteristics at one time, and also, one by one, the configuration as shown in FIG. If the configuration is provided, there is a problem that the light emitting device is enlarged.
  • the laser light emitting device of the present invention provides a measure against variations in the characteristics of these laser elements, and solves the above-mentioned problems. According to the laser light emitting device of the present invention, on-vehicle becomes possible.
  • the chopper circuit can be fixed to a step-up or step-down type.
  • the device can be simplified. That is, even if the power supply voltage or the characteristics of the semiconductor laser element vary, it is possible to provide a laser light emitting device which can be used only with the booster circuit or the voltage drop circuit.
  • Example 1 of the laser light-emitting device by this invention It is a related figure of series number of the laser array concerning the present invention, and required drive voltage. It is a related figure of the boost ratio and efficiency in the predetermined power supply voltage concerning the present invention.
  • Example 2 of the laser light-emitting device by this invention It is a circuit diagram of Example 3 of the laser light-emitting device by this invention.
  • Example 4 of the laser light-emitting device by this invention It is a related figure of the serial number of the laser array of Example 4 concerning this invention, and a required drive voltage. It is a related figure of the pressure
  • FIG. 1 is a circuit diagram of a laser light emitting device showing a first embodiment of the present invention
  • FIG. 2 is a diagram showing the relationship between the number of laser arrays connected in series and a required driving voltage
  • FIG. It is a figure which shows the relationship of efficiency.
  • the laser light emitting device 100 includes a storage battery 107, a coil 101 whose one end is connected to the positive electrode of the storage battery 107, a transistor 102 (first transistor) connected between the other end of the coil 101 and the ground, A diode 103 (first diode) whose other end is connected to the anode, a capacitor 104 connected between the cathode of the diode 103 and the ground, a laser array 105 whose anode is connected to the cathode of the diode 103, a laser array 105 It is configured to include a transistor 106 connected between the grounds.
  • a step-up chopper circuit 108 is formed by the coil 101, the transistor 102, the diode 103 and the capacitor 104.
  • a plurality of laser arrays 105 and a plurality of chopper circuits 108 for driving the plurality of laser arrays may be connected in parallel to the storage battery 107 according to the required light amount.
  • the step-up chopper circuit 108 when the transistor 102 is turned on, the voltage of the storage battery 107 is applied to the coil 101 to store energy, and when the transistor 102 is turned off, this energy charges the capacitor 104 through the diode 103. Be done. Then, the voltage of capacitor 104 becomes higher than the voltage of storage battery 107 by repeating this charging. Thereafter, the voltage charged in the capacitor 104, that is, the output voltage of the step-up chopper circuit 108 is applied to the laser array 105, and the laser array 105 emits light. The transistor 106 is provided to shut off the circuit in an emergency.
  • FIG. 2 shows the number of laser arrays connected in series and the Vf of the laser element (forward voltage, in other words, the required driving voltage of a single laser element) when the power supply voltage of the laser light emitting apparatus 100 of FIG.
  • the relationship between the laser array required drive voltage and the drive voltage required for the three ranks is represented by a matrix.
  • the present embodiment if the variation of the forward voltage of the semiconductor laser element and the fluctuation range of the power supply voltage are known from this matrix, it is possible to determine the optimum number of laser arrays in series that can be used only with the booster circuit. is there.
  • the required drive voltage of the laser array with respect to the storage battery voltage may be selected in series of three or more in order to maintain the boosting relationship. In the case of three series, the required drive voltage is 15 V, which is equal to the storage battery voltage. Therefore, four series or more is more preferable in order to maintain a more stable light emitting operation.
  • FIG. 3 is a diagram showing experimental data representing the relationship between the step-up ratio and the efficiency of the chopper circuit when 9 to 48 V is used as the power supply voltage.
  • the rated voltage of the storage battery is 12 V
  • the Vf of the semiconductor laser device is the number of series of the laser array under the condition of 9 V which is the maximum voltage of variation. If four series are selected, the required drive voltage of the laser array is 36 V with respect to the power supply voltage of 9 V, and the boosting ratio at this time is quadrupled.
  • the current from the storage battery 107 stores energy in the coil 101
  • a current flows into the capacitor 104 connected to the output side of the coil 101 through the coil 101.
  • the energy stored in coil 101 is released as a current, and the voltage of capacitor 104 is increased by further increasing the voltage of capacitor 104.
  • the resistance component of the diode 103, etc. is included, so the value is approximately 2 V minus approximately 1 V.
  • the phenomenon is that the capacitor 104 is installed on the output side of the coil 101 and the coil 101, and energy is not stored in the coil 101 and the capacitor 104, that is, the battery 107 and the boost chopper circuit 108 are not connected. Is a phenomenon that occurs only when connected from.
  • the maximum voltage fluctuation is 15 V. Therefore, when the storage battery 107 is connected, the output voltage of the step-up chopper circuit 108 rises up to about 29 V and the laser array at the initial drive A voltage of about 29 V will be applied to 105.
  • the number of series of the laser array 105 is 6 series or more, and the variation of Vf is a minimum value.
  • the number of laser arrays in series is required under the condition that the required drive voltage of the laser array is always higher than the power supply voltage due to the fluctuation of the power supply voltage and the fluctuation of the forward voltage of the semiconductor laser device. Since the determination can be made, the chopper circuit can be simplified to only a step-up type, and stabilization as a laser light emitting device and a vehicle lamp becomes possible.
  • the number of series connection of the laser array 105 is increased to increase the required driving voltage.
  • the efficiency of the step-up chopper circuit 108 is reduced to some extent.
  • the laser array 105 is considered in consideration of the application of a voltage of 29 V at the time of initial driving. If the number of series 105 is six in series, the required drive voltage is 30 V when the variation of Vf of the semiconductor laser element is 5 V, and hence the step-up ratio of the step-up chopper circuit 108 is approximately doubled. Further, referring to FIG. 3, the efficiency at this time is 96.5% or more.
  • FIG. 4 is a circuit diagram of a laser light emitting apparatus 200 showing a second embodiment of the present invention.
  • the present embodiment is different from the first embodiment in that a diode 109 (second diode) is connected between the storage battery 107 and the cathode of the diode 103 which is the output of the step-up chopper circuit 108.
  • the voltage rise of the output voltage of the step-up chopper circuit 110 at the time of initial driving has become + 10% 16.5 V
  • the efficiency is prevented from decreasing with the increase of the step-up ratio.
  • the laser array 105 can be protected from
  • the load on the diode 109 may be reduced by connecting a resistor in series with the diode 109 within a range that the charging time for the capacitor 104 does not become too long.
  • FIG. 5 is a circuit diagram of a laser light emitting apparatus 300 showing a third embodiment of the present invention.
  • the transistor 111 (second transistor) is connected in parallel to the diode 109 described in the second embodiment. More specifically, the drain of the transistor 111 is connected to the anode of the diode 109, and the source of the transistor 111 is connected to the cathode of the diode 109.
  • the function of the diode 109 is as described in the second embodiment.
  • the overvoltage in the initial driving can be further reduced. Specifically, since connection of the transistor 111 enables conduction of current in both directions between the storage battery 107 and the capacitor 104, the capacitor 104 is rapidly charged, and the storage battery 107 is supplied with electrical energy due to overvoltage. It is to reflux. As a result, it is possible to further suppress the voltage increase that slightly occurs even in the overvoltage suppression by the diode 109, for example, the voltage increase of about + 10% described in the description of the second embodiment.
  • FIG. 6 is a circuit diagram of a laser light emitting device showing a fourth embodiment of the present invention
  • FIG. 7 is a diagram showing the relationship between the number of laser arrays connected in series and the required drive voltage
  • FIG. It is a figure which shows the relationship of efficiency.
  • the laser light emitting device 400 includes a storage battery 107, a transistor 102 whose drain terminal is connected to the positive terminal of the storage battery 107, a diode 103 whose cathode terminal is connected to the source terminal of the transistor 102 and an anode terminal is grounded.
  • a coil 101 whose one end is connected to the cathode terminal, a capacitor 104 whose one end is connected to the other end of the coil 101 and whose other end is grounded, a laser array 105 b whose anode terminal is connected to one end of the capacitor 104, a cathode of the laser array 105 b
  • a transistor 106 is connected between the terminal and the ground.
  • a chopper circuit 113 is formed by the transistor 102, the coil 101, the diode 103 and the capacitor 104.
  • a plurality of laser arrays 105 b and a plurality of chopper circuits 113 for driving the plurality of laser arrays may be connected in parallel to the storage battery 107 according to the required light amount.
  • the chopper circuit 113 when the transistor 102 is turned on, the voltage of the storage battery 107 is applied to the coil 101 to store energy. Further, the current passing through the coil 101 is charged to the capacitor 104. Further, when the transistor 102 is turned off, the energy stored in the coil 101 charges a current to the capacitor 104 from the ground side through the diode 103 and the coil 101. By repeating this operation, the voltage of capacitor 104 can be arbitrarily adjusted in the range of voltage lower than the voltage of storage battery 107. Thereafter, the voltage charged in the capacitor 104, that is, the output voltage of the chopper circuit 113 is applied to the laser array 105b, and the laser array 105b emits light. The transistor 106 is provided to shut off the circuit in an emergency.
  • FIG. 7 shows the number of laser arrays connected in series and the Vf of the laser element (forward voltage, in other words, the required driving voltage of a single laser element) when the power supply voltage of the laser light emitting device 400 of FIG.
  • the relationship between the laser array required drive voltage and the drive voltage required for the three ranks is represented by a matrix.
  • the optimum number of series of laser arrays usable only with the step-down circuit can be determined. is there.
  • the required drive voltage of the laser array with respect to the storage battery voltage is such that the number of series required to always maintain the step-down relationship may be three series or less.
  • FIG. 8 is a diagram showing experimental data representing the relationship between the step-down ratio of the chopper circuit and the efficiency when 9 to 60 V is used as the power supply voltage.
  • the rated voltage of the storage battery is 36 V
  • the Vf of the semiconductor laser device is the number of laser arrays in series under the condition of 5 V which is the minimum voltage of variation. If three series are selected, the required drive voltage of the laser array is 15 V with respect to the power supply voltage of 46 V, and the step-down ratio at this time is 0.33 times.
  • the number of laser arrays in series is required under the condition that the required drive voltage of the laser array is always lower than the power supply voltage due to the fluctuation of the power supply voltage and the fluctuation of the forward voltage of the semiconductor laser device. Since the determination can be made, the chopper circuit can be simplified to only a step-down type, and stabilization as a laser light emitting device and a vehicle lamp becomes possible.
  • the storage battery 107 and the chopper circuit 113 are connected from the unconnected state to the connected state, and the transistor 102 starts the switching operation (the transistor 102 performs on / off cycles).
  • the current from the storage battery 107 stores energy in the coil 101, it passes through the coil 101 and flows into the capacitor 104 connected to the output side of the coil 101. Thereafter, even after charging of the capacitor 104 is completed and equal to the required drive voltage of the laser array 105b, the energy stored in the coil 101 is released as a current, and the voltage of the capacitor 104 is further raised.
  • a phenomenon occurs in which the voltage of 104 or a voltage higher than the required drive voltage of the laser array 105b is generated.
  • the step-down ratio of the chopper circuit 113 is 0.5 times to step down to 18 V which is the required drive voltage of the laser array 105 b.
  • the voltage of the capacitor 104 becomes about 20 V due to the phenomenon described above.
  • the on / off ratio at the start of the switching operation is 0.1 compared to 1: 1 which is the on / off ratio at 18 V of the steady voltage. : 1.
  • the voltage of the capacitor 104 is suppressed to charge up to about 2V.
  • the on / off ratio is changed to 0.5: 1, and the capacitor 104 is charged to about 10 V.
  • the voltage of the capacitor 104 is charged to near the steady state voltage of 18 V, so the drive voltage of the laser array 105b is properly set.
  • the laser array can be protected from an overvoltage at the start of the switching operation by gradually increasing the on / off ratio of the switching transistor to a steady state on / off ratio.
  • the laser light emitting device of the present invention is a DC power supply and a chopper circuit for boosting the voltage of the DC power supply, and a coil whose one end is connected to the DC power supply and a drain terminal is connected to the other end of the coil.
  • a first transistor whose source terminal is grounded, a first diode whose anode terminal is connected to the other end of the coil, and a cathode terminal of the first diode whose other end is grounded
  • a laser emission device comprising: the chopper circuit including a capacitor; and a semiconductor laser device group driven by the chopper circuit and having a plurality of semiconductor laser devices connected in series, the number of semiconductor laser device groups being:
  • the chopper circuit can increase the required driving voltage of the semiconductor laser element group to a predetermined voltage fluctuation of the DC power supply. .
  • the required drive voltage may be based on a voltage of a semiconductor laser device having the lowest drive voltage among the semiconductor laser device group.
  • the plurality of semiconductor laser element groups may be arranged in parallel and driven by the plurality of chopper circuits.
  • the laser light emitting device of the present invention further includes a second diode connected between the one end of the coil and the cathode terminal of the first diode, and an anode terminal connected to the one end of the coil. It is good.
  • the laser light emitting device of the present invention may further include a second transistor having a drain terminal connected to the anode terminal of the second diode and a source terminal connected to the cathode terminal.
  • the laser light emitting device of the present invention is a DC power supply, a chopper circuit for stepping down the voltage of the DC power supply, a transistor whose drain terminal is connected to the positive electrode of the DC power supply, and a cathode to the source terminal of the transistor.
  • the chopper circuit comprising: a diode connected to a terminal and the anode terminal connected to ground; a coil connected to one end of the cathode terminal of the diode; and a capacitor connected to the other end of the coil and connected to the other end and grounded.
  • the number of chopper circuits may be such that the required drive voltage of the semiconductor laser element group is stepped down against fluctuations.
  • the required drive voltage may be based on a voltage of a semiconductor laser device having the highest drive voltage in the semiconductor laser device group.
  • the laser light emitting device according to the present invention may be provided in a vehicle lamp.
  • the laser light emitting device according to the present invention can be widely applied not only to lamps for vehicles but also to laser light emitting devices in general using unstable power sources.

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  • Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Optics & Photonics (AREA)
  • Semiconductor Lasers (AREA)
  • Lighting Device Outwards From Vehicle And Optical Signal (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)
  • Led Devices (AREA)

Abstract

La présente invention concerne un dispositif émetteur de lumière laser dans lequel le nombre d'élément à laser en semiconducteur contenus dans un groupe d'éléments à laser en semiconducteur (105) est un nombre tel qu'un circuit hacheur (108) maintient une tension d'attaque requise du groupe d'éléments à laser en semiconducteur (105) à une relation de tension croissante ou de tension décroissante par rapport à une fluctuation de tension prédéterminée d'une source d'alimentation CC (107).
PCT/JP2011/067616 2010-11-26 2011-08-01 Dispositif émetteur de lumière laser et appareillage d'éclairage de véhicule utilisant celui-ci WO2012070283A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP2010-263593 2010-11-26
JP2010263593A JP2012114338A (ja) 2010-11-26 2010-11-26 レーザ発光装置、およびこれを用いた車両用灯具
JP2010-284287 2010-12-21
JP2010284287A JP2012134281A (ja) 2010-12-21 2010-12-21 レーザ発光装置、およびこれを用いた車両用灯具

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WO2012070283A1 true WO2012070283A1 (fr) 2012-05-31

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WO (1) WO2012070283A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106658912A (zh) * 2016-12-21 2017-05-10 青岛海信电器股份有限公司 用于投影显示设备中激光双色光源的电源驱动电路
US10141716B1 (en) 2013-09-30 2018-11-27 Waymo Llc Laser diode firing system
US10256605B2 (en) 2016-10-14 2019-04-09 Waymo Llc GaNFET as energy store for fast laser pulser
US20190229493A1 (en) * 2018-01-22 2019-07-25 Argo AI, LLC Circuit for Driving a Laser and Method Therefor

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02269465A (ja) * 1989-04-11 1990-11-02 Fuji Elelctrochem Co Ltd 電源装置
JP2002008409A (ja) * 2000-06-19 2002-01-11 Toshiba Lighting & Technology Corp Ｌｅｄ光源装置
JP2004039288A (ja) * 2002-06-28 2004-02-05 Matsushita Electric Works Ltd 照明装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02269465A (ja) * 1989-04-11 1990-11-02 Fuji Elelctrochem Co Ltd 電源装置
JP2002008409A (ja) * 2000-06-19 2002-01-11 Toshiba Lighting & Technology Corp Ｌｅｄ光源装置
JP2004039288A (ja) * 2002-06-28 2004-02-05 Matsushita Electric Works Ltd 照明装置

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10141716B1 (en) 2013-09-30 2018-11-27 Waymo Llc Laser diode firing system
US10277007B1 (en) 2013-09-30 2019-04-30 Waymo Llc Laser diode firing system
US10581221B1 (en) 2013-09-30 2020-03-03 Waymo Llc Laser diode firing system
US11303096B1 (en) 2013-09-30 2022-04-12 Waymo Llc Laser diode firing system
US11923658B1 (en) 2013-09-30 2024-03-05 Waymo Llc Laser diode firing system
US10256605B2 (en) 2016-10-14 2019-04-09 Waymo Llc GaNFET as energy store for fast laser pulser
US10535977B1 (en) 2016-10-14 2020-01-14 Waymo Llc GaNFET as energy store for fast laser pulser
CN106658912A (zh) * 2016-12-21 2017-05-10 青岛海信电器股份有限公司 用于投影显示设备中激光双色光源的电源驱动电路
US20190229493A1 (en) * 2018-01-22 2019-07-25 Argo AI, LLC Circuit for Driving a Laser and Method Therefor
US10903621B2 (en) * 2018-01-22 2021-01-26 Argo AI, LLC Circuit for driving a laser and method therefor

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