WO2021210217A1 - レーザダイオード駆動回路 - Google Patents

レーザダイオード駆動回路 Download PDF

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Publication number
WO2021210217A1
WO2021210217A1 PCT/JP2020/045892 JP2020045892W WO2021210217A1 WO 2021210217 A1 WO2021210217 A1 WO 2021210217A1 JP 2020045892 W JP2020045892 W JP 2020045892W WO 2021210217 A1 WO2021210217 A1 WO 2021210217A1
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WIPO (PCT)
Prior art keywords
laser diode
capacitor
drive circuit
inductor
parallel
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.)
Ceased
Application number
PCT/JP2020/045892
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English (en)
French (fr)
Japanese (ja)
Inventor
翔太 安藤
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.)
Murata Manufacturing Co Ltd
Original Assignee
Murata Manufacturing Co Ltd
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 Murata Manufacturing Co Ltd filed Critical Murata Manufacturing Co Ltd
Priority to CN202080094831.3A priority Critical patent/CN115004490B/zh
Priority to DE112020006729.7T priority patent/DE112020006729T5/de
Priority to JP2022515203A priority patent/JP7396470B2/ja
Publication of WO2021210217A1 publication Critical patent/WO2021210217A1/ja
Priority to US17/875,962 priority patent/US20220376472A1/en
Anticipated expiration legal-status Critical
Priority to JP2023200427A priority patent/JP7533744B2/ja
Ceased legal-status Critical Current

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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
    • H01S5/0428—Electrical excitation ; Circuits therefor for applying pulses to the laser
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
    • G01S7/483—Details of pulse systems
    • G01S7/484—Transmitters
    • 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
    • H01S5/0261—Non-optical elements, e.g. laser driver components, heaters
    • 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
    • H01S5/06—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium
    • H01S5/062—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium by varying the potential of the electrodes
    • H01S5/06209—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium by varying the potential of the electrodes in single-section lasers
    • H01S5/06216—Pulse modulation or generation
    • 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
    • H01S5/06—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium
    • H01S5/062—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium by varying the potential of the electrodes
    • H01S5/06226—Modulation at ultra-high frequencies

Definitions

  • the present invention relates to a circuit for driving a laser diode, and more particularly to a drive circuit for a laser diode that emits a short pulse laser.
  • FIG. 14 is a circuit diagram of a laser diode drive circuit disclosed in Patent Document 1.
  • the switch element 16 shorts the capacitor 15 charged at a high voltage via the laser diode 4.
  • the capacitor 15 is recharged via the charging element (resistive element) 18.
  • the driver 17 drives the switch element 16.
  • the diode 19 has a function of discharging the charging current of the capacitor 15 and a function of returning the pulse current of the laser diode 4.
  • the diode 19 suppresses the vibration of the current flowing in the circuit formed by the laser diode 4, the capacitor 15, and the switch element 16, and also prevents the positive voltage applied through the laser diode 4.
  • the resistance element 20 is selected to have a resistance value that rapidly eliminates the pulse current of the laser diode 4.
  • FIG. 15 is a circuit diagram of a laser diode drive circuit disclosed in Patent Document 2.
  • This laser diode drive circuit is connected in parallel to a series circuit 30 in which a DC power supply V1, an inductor 22, a backflow prevention diode 24, a capacitor 26, and a laser diode 28 that emits light by the discharge current of the capacitor 26 are connected in series, and a laser diode 28.
  • the diode 32 is connected at one end between the diode 24 and the capacitor 26, the other end is grounded, and the switching element 34 that switches the current flowing through the inductor 22 by turning on / off and the switching element 34 are turned on / off.
  • It includes a control circuit 36 for controlling.
  • the control circuit 36 turns off the switching element 34 when charging the capacitor 26.
  • the decrease in the emitted light power can be eliminated by increasing the input voltage (“high voltage” in FIG. 14).
  • high voltage in FIG. 14
  • the circuit becomes complicated accordingly, the number of parts increases, and it becomes a factor of cost increase.
  • the pulse width of the emitted light becomes thicker due to the application of a high voltage, it becomes a problem for applications that require a short pulse width and a high instantaneous peak.
  • the laser diode drive circuit described in Patent Document 2 also causes a decrease in the applied voltage and the emitted light power of the laser diode 4 for the same reason as the circuit shown in Patent Document 1.
  • This decrease in the emitted light power can be eliminated by increasing the voltage of the node Vo in FIG.
  • increasing the voltage of the node Vo increases the pulse width of the emitted light, which is still a problem for applications that require a short pulse width and a high instantaneous peak.
  • an object of the present invention is to provide a drive circuit of a laser diode that emits a short pulse laser having a short pulse width and a high instantaneous peak.
  • the laser diode drive circuit as an example of the present disclosure includes a loop including a laser diode, a drive capacitor for accumulating drive charge, and a switch element, and a first inductor connected in series to the laser diode.
  • a parallel capacitor connected in parallel to a series circuit composed of the laser diode and the first inductor, and a first diode connected in parallel to the series circuit in a relationship of opposite polarity to the laser diode are provided. It is characterized in that both ends of the switch element are input units of a DC power supply.
  • the current path by the drive capacitor, the switch element, the first inductor and the laser diode is formed.
  • the first inductor acts as an obstacle to the rise of the current flowing through the laser diode. Therefore, the current flowing through the laser diode immediately after the switch element is turned on is smaller than that without the parallel capacitor and the first inductor. After that, the energy charged in the parallel capacitor is supplied to the laser diode, so that the current flowing through the laser diode becomes larger than when there is no parallel capacitor.
  • the laser diode drive circuit as an example of the present disclosure includes a laser diode and a switch element forming a loop together with a DC power supply, a first inductor connected in series with the laser diode, and the laser diode and the first inductor. It is characterized by having a parallel capacitor connected in parallel to a series circuit composed of.
  • the current path by the DC power supply, the switch element and the parallel capacitor is formed.
  • the first inductor acts as an obstacle to the rise of the current flowing through the laser diode. Therefore, the current flowing through the laser diode immediately after the switch element is turned on is smaller than that without the parallel capacitor and the first inductor. After that, the energy charged in the parallel capacitor is supplied to the laser diode, so that the current flowing through the laser diode becomes larger than when there is no parallel capacitor.
  • the laser diode drive circuit as an example of the present disclosure includes a loop including a laser diode, a drive capacitor for accumulating drive charge, and a switch element, and a first inductor connected in series to the laser diode.
  • a parallel capacitor connected in parallel to a series circuit of the laser diode and the first inductor is provided, and both ends of the drive capacitor are used as input portions of a DC power supply.
  • the current flowing through the laser diode becomes small immediately after the switch element is turned on, and then the current flowing through the laser diode becomes large.
  • a laser diode drive circuit capable of emitting a short pulse laser having a short pulse width and a high instantaneous peak can be obtained.
  • FIG. 1 is a circuit diagram of a laser diode drive circuit 101 according to the first embodiment.
  • FIG. 2 is a waveform diagram showing a current flowing through the laser diode LD1 after the switch element Q1 of the laser diode drive circuit 101 is turned on.
  • FIG. 3 is a diagram showing an example of waveforms of the current ILD1 flowing through the laser diode LD1 and the current IC2 flowing through the parallel capacitor C2.
  • 4 (A), 4 (B), and 4 (C) are circuit diagrams of another laser diode drive circuit according to the first embodiment.
  • FIG. 5 is a circuit diagram of the laser diode drive circuit 102 according to the second embodiment.
  • FIG. 6 is a circuit diagram of the laser diode drive circuit 103A according to the third embodiment.
  • FIG. 7 is a circuit diagram of another laser diode drive circuit 103B according to the third embodiment.
  • FIG. 8 is a circuit diagram of the laser diode drive circuit 104 according to the fourth embodiment.
  • FIG. 9 is a circuit diagram of the laser diode drive circuit 105 according to the fifth embodiment.
  • 10 (A) and 10 (B) are circuit diagrams of the laser diode drive circuit 106A according to the sixth embodiment.
  • FIG. 11 is a circuit diagram of another laser diode drive circuit 106B according to the sixth embodiment.
  • FIG. 12 is a circuit diagram of the laser diode drive circuit 107 according to the seventh embodiment.
  • FIG. 13 is a circuit diagram of the laser diode drive circuit 108 according to the eighth embodiment.
  • FIG. 14 is a circuit diagram of a laser diode drive circuit disclosed in Patent Document 1.
  • FIG. 15 is a circuit diagram of a laser diode drive circuit disclosed in Patent Document 2.
  • FIG. 1 is a circuit diagram of a laser diode drive circuit 101 according to the first embodiment.
  • the laser diode drive circuit 101 includes a first loop LP1 including a laser diode LD1, a drive capacitor C1 for accumulating drive charges, and a switch element Q1.
  • a first inductor L1 is connected in series to the laser diode LD1.
  • the parallel capacitor C2 is connected in parallel to the series circuit composed of the laser diode LD1 and the first inductor L1.
  • the first diode D1 is connected in parallel to the series circuit of the laser diode LD1 and the first inductor L1 in a relationship of opposite polarity to that of the laser diode LD1.
  • Both ends of the switch element Q1 are input units for a DC power supply, and a resistance element R1 is connected in series to the DC power supply V1.
  • the second loop LP2 is composed of the switch element Q1, the drive capacitor C1 and the parallel capacitor C2, and the third loop LP3 is composed of the parallel capacitor C2, the laser diode LD1 and the first inductor L1.
  • the switch element Q1 remains off.
  • a charging current flows through the drive capacitor C1 in the path of the DC power supply V1 ⁇ the resistance element R1 ⁇ the drive capacitor C1 ⁇ the first diode D1, and the drive capacitor C1 is charged with the DC voltage of the DC power supply V1.
  • a charging current flows through the parallel capacitor C2 in the path of the DC power supply V1 ⁇ the resistance element R1 ⁇ the drive capacitor C1 ⁇ the parallel capacitor C2, but the first diode D1 is connected in parallel to the parallel capacitor C2. Therefore, the parallel capacitor C2 is only charged with the forward voltage of the first diode D1.
  • the switch element Q1 When the laser diode LD1 is driven, the switch element Q1 is turned on and the electric charge of the drive capacitor C1 is discharged in the path of the first loop LP1 to drive the laser diode LD1. Further, the parallel capacitor C2 is charged in the path of the second loop LP2.
  • the discharge current of the parallel capacitor C2 flows through the laser diode LD1 in the path of the third loop LP3.
  • FIG. 2 is a waveform diagram showing a current flowing through the laser diode LD1 after the switch element Q1 of the laser diode drive circuit 101 is turned on.
  • the horizontal axis represents the elapsed time from the turn-on of the switch element Q1
  • the vertical axis represents the current flowing through the laser diode LD1.
  • the waveform CW0 is a waveform by the laser diode drive circuit as a comparative example
  • the waveform CW1 is the waveform by the laser diode drive circuit 101 according to the second embodiment.
  • the laser diode drive circuit of this comparative example is a circuit without the first inductor L1 and the parallel capacitor C2.
  • the time zone T1 in FIG. 2 can be referred to as a “drive current suppression period”, and the time zone T2 can be referred to as a “drive current enhancement period”.
  • the current path by the drive capacitor C1, the switch element Q1, the first inductor L1 and the laser diode LD1 in addition to the current path (first loop LP1) by the drive capacitor C1, the switch element Q1, the first inductor L1 and the laser diode LD1, the current path by the drive capacitor C1, the switch element Q1 and the parallel capacitor C2 (second). Since the loop LP2) is provided, the electric charge accumulated in the drive capacitor C1 is discharged in the path of the first loop LP1 and also in the second loop LP2 immediately after the switch element Q1 is turned on. Therefore, the rise of the current flowing through the laser diode LD1 is suppressed in the time zone T1 immediately after the switch element is turned on. The parallel capacitor C2 is charged by the current flowing through the second loop LP2.
  • the first inductor L1 hinders the rise of the current flowing through the laser diode LD1 due to its inductance. Therefore, the action of the first inductor L1 also suppresses the rise of the current flowing through the laser diode LD1 in the time zone T1 immediately after the switch element is turned on.
  • the current flowing through the laser diode LD1 is larger than that in the case without the parallel capacitor C2.
  • the time zone T2 which is the drive current enhancement period, is shortened, and the peak of the drive current flowing through the laser diode LD1 is increased.
  • the current flowing through the circuit formed by the parallel capacitor C2, the first inductor L1, the laser diode LD1 and the first diode D1 is an attenuated vibration current, and the peak of this current and the current flowing from the drive capacitor C1 to the first loop LP1 When the peaks overlap, the current enhancement effect in the time zone T2 is maximized.
  • the capacitance of the parallel capacitor C2 is represented by C2
  • the inductance of the first inductor L1 is represented by L1
  • the resistance component of the laser diode LD1 is represented by R LD1, R 2 LD1 ⁇ 4L1 / C2 It is preferable to satisfy the above conditions. This is also common to the second and subsequent embodiments shown below.
  • Figure 3 is a diagram showing an example of a waveform of the current I C2 flowing through the current I LD1 and parallel capacitor C2 flows in the laser diode LD1.
  • the direction of the current charged in the parallel capacitor C2 by the loop LP2 shown in FIG. 1 is “positive”, and the direction in which the current is discharged from the parallel capacitor C2 by the loop LP3 is “negative”.
  • the time point tz1 is the time when the current I C2 swings from positive to negative
  • tp is the time when the current flowing through the laser diode LD1 becomes maximum
  • tz2 is the time when the current I C2 swings from negative to positive.
  • the magnitude relationship of tz1, tz2, and tp changes depending on the value of the parallel capacitor C2. By satisfying the above conditions, the discharge current of the parallel capacitor C2 enhances the drive current of the laser diode LD1. This is also common to the second and subsequent embodiments shown below.
  • 4 (A), 4 (B), and 4 (C) are circuit diagrams of another laser diode drive circuit according to the first embodiment.
  • the laser diode drive circuit 101A shown in FIG. 4A is an example in which the positional relationship between the laser diode LD1 shown in FIG. 1 and the first inductor L1 is exchanged.
  • the laser diode drive circuit 101A and the laser diode drive circuit 101 shown in FIG. 1 are equivalent in terms of circuits.
  • the laser diode drive circuit 101B shown in FIG. 4B is an example in which the position of the drive capacitor C1 shown in FIG. 1 is changed. Since the loops LP1 and LP2 including the drive capacitor C1 are equivalent to the laser diode drive circuit 101, the laser diode drive circuit 101B and the laser diode drive circuit 101 shown in FIG. 1 are equivalent on the circuit.
  • the laser diode drive circuit 101C shown in FIG. 4C is an example in which the position of the resistance element R1 shown in FIG. 1 is changed. Since the charging current path of the driving capacitor C1 of the laser diode driving circuit 101C is equivalent to the charging current path of the driving capacitor C1 of the laser diode driving circuit 101, the laser diode driving circuit 101C and the laser diode driving circuit 101 shown in FIG. 1 are shown. Is equivalent on the circuit.
  • Second Embodiment a laser diode drive circuit including a circuit for boosting the charging voltage of the drive capacitor C1 is illustrated.
  • FIG. 5 is a circuit diagram of the laser diode drive circuit 102 according to the second embodiment.
  • the laser diode drive circuit 102 includes a laser diode LD1, a drive capacitor C1, a switch element Q1, a first inductor L1, a parallel capacitor C2, and a first diode D1.
  • a series circuit of the second inductor L2 and the second diode D2 is inserted between the DC power supply V1 and the switch element Q1.
  • the configuration including the series circuit of the second inductor L2 and the second diode D2 is different from the laser diode drive circuit 101 shown in the first embodiment.
  • the switch element Q1 when the switch element Q1 is turned on, a current flows in the path of the DC power supply V1 ⁇ the second inductor L2 ⁇ the second diode D2 ⁇ the switch element Q1, and the second inductor L2 Excitation energy is stored in the diode.
  • the switch element Q1 when the switch element Q1 is turned off, the charging current of the drive capacitor C1 flows through the path of the DC power supply V1 ⁇ the second diode D2 ⁇ the drive capacitor C1 and the first diode D1. At this time, the boosted voltage is charged to the drive capacitor C1 by the same action as the boost chopper circuit.
  • the laser diode LD1 can be driven with a voltage higher than the voltage of the DC power supply V1. That is, the laser diode LD1 can be driven at high voltage with a small number of parts without separately providing a special booster circuit.
  • FIG. 6 is a circuit diagram of the laser diode drive circuit 103A according to the third embodiment.
  • the laser diode drive circuit 103A includes a laser diode LD1, a drive capacitor C1, a switch element Q1, a first inductor L1, a parallel capacitor C2, a first diode D1, and a resistance element R1.
  • this laser diode drive circuit 103A unlike the laser diode drive circuit 101 shown in the first embodiment, a parallel circuit of the resistance element R2 and the third diode D3 is inserted between the switch element Q1 and the parallel capacitor C2. Has been done.
  • Parasitic inductance exists in the second loop LP2 including the switch element Q1, the drive capacitor C1, and the parallel capacitor C2. Due to the action of this parasitic inductance, the voltage of the parallel capacitor C2 may be higher than the voltage of the drive capacitor C1. At this time, the third diode D3 prevents the discharge current of the parallel capacitor C2 from flowing to the switch element Q1 side. As a result, as shown by the third loop LP3 in FIG. 6, a larger current flows through the laser diode LD1, and a larger instantaneous peak current can be obtained.
  • the resistance element R2 forms the charging current path CP of the drive capacitor C1.
  • the resistance element R2 needs to be sufficiently higher than the impedance of the laser diode LD1 in order to secure the above-mentioned action of the third diode D3.
  • FIG. 7 is a circuit diagram of another laser diode drive circuit 103B according to the third embodiment.
  • the laser diode drive circuit 103B is a circuit diagram in which the resistance element R2 of the laser diode drive circuit 103A shown in FIG. 6 is replaced with a third inductor L3.
  • the third diode D3 prevents the discharge current of the parallel capacitor C2 from flowing to the switch element Q1 side. Further, since the third inductor L3 suppresses the transient current that the discharge current of the parallel capacitor C2 tends to flow to the switch element Q1, the above-mentioned action of the third diode D3 is ensured.
  • FIG. 8 is a circuit diagram of the laser diode drive circuit 104 according to the fourth embodiment.
  • the laser diode drive circuit 104 includes a first loop LP1 including a laser diode LD1, a drive capacitor C1 and a switch element Q1, a first inductor L1 connected in series with the laser diode LD1, a laser diode LD1 and a first loop.
  • This is a circuit including a parallel capacitor C2 connected in parallel to a series circuit with the inductor L1 and having both ends of the drive capacitor C1 as input portions of a DC power supply.
  • the laser diode drive circuit 104 operates as follows.
  • the switch element Q1 remains off. During this standby, the drive capacitor C1 is charged with the voltage of the DC power supply V1.
  • the switch element Q1 When the laser diode LD1 is driven, the switch element Q1 is turned on and the electric charge of the drive capacitor C1 is discharged in the path of the first loop LP1 to drive the laser diode LD1. Further, the parallel capacitor C2 is charged in the path of the second loop LP2.
  • the discharge current of the parallel capacitor C2 flows through the laser diode LD1 in the path of the third loop LP3.
  • FIG. 9 is a circuit diagram of the laser diode drive circuit 105 according to the fifth embodiment.
  • the laser diode drive circuit 105 includes a fourth diode D4 between the drive capacitor C1 and the parallel capacitor C2 in the laser diode drive circuit 104 shown in FIG.
  • Parasitic inductance exists in the second loop LP2 including the switch element Q1, the drive capacitor C1, and the parallel capacitor C2. Due to the action of this parasitic inductance, the voltage of the parallel capacitor C2 may be higher than the voltage of the drive capacitor C1. At this time, the fourth diode D4 prevents the discharge current of the parallel capacitor C2 from flowing to the drive capacitor C1 side. As a result, all of the discharge current of the parallel capacitor C2 flows through the laser diode LD1, and a larger instantaneous peak current flows through the laser diode LD1.
  • ⁇ 6th Embodiment a laser diode drive circuit having a different configuration of the drive capacitor C1 of the laser diode drive circuit according to the first, second, and third embodiments will be illustrated.
  • FIG. 10 (A) and 10 (B) are circuit diagrams of the laser diode drive circuit 106A according to the sixth embodiment.
  • FIG. 10A is a circuit in which the drive capacitor C1 in the laser diode drive circuit 101 shown in FIG. 1 is replaced with a DC power supply V1 and the first diode D1 is deleted.
  • FIG. 10B is a diagram showing the circuit shown in FIG. 10A in a general form.
  • the operation of the laser diode drive circuit 106A is as follows.
  • the switch element Q1 When the laser diode LD1 is driven, the switch element Q1 is turned on, and the drive current of the laser diode LD1 flows in the path of the DC power supply V1 ⁇ the switch element Q1 ⁇ the first inductor L1 ⁇ the laser diode LD1 (first loop LP1). Further, a charging current flows through the parallel capacitor C2 in the path of the DC power supply V1 ⁇ the switch element Q1 ⁇ the parallel capacitor C2 (second loop LP2). After that, the discharge current of the parallel capacitor C2 flows through the third loop LP3.
  • FIG. 11 is a circuit diagram of another laser diode drive circuit 106B according to the sixth embodiment.
  • the DC power supply is a negative power supply, but in this laser diode drive circuit 106B, the DC power supply is a positive power supply.
  • the circuit operation is the same as that of the laser diode drive circuit 106A.
  • FIG. 12 is a circuit diagram of the laser diode drive circuit 107 according to the seventh embodiment.
  • the laser diode drive circuit 107 is a circuit in which the drive capacitor C1 in the laser diode drive circuit 104 shown in FIG. 8 is replaced with a DC power supply V1.
  • the operation of the laser diode drive circuit 107 is as follows.
  • the switch element Q1 When the laser diode LD1 is driven, the switch element Q1 is turned on, and the drive current of the laser diode LD1 flows through the path (first loop LP1) of the DC power supply V1 ⁇ the first inductor L1 ⁇ the laser diode LD1 ⁇ the switch element Q1. Further, a charging current flows through the parallel capacitor C2 in the path (second loop LP2) of the DC power supply V1 ⁇ the parallel capacitor C2 ⁇ the switch element Q1. After that, the discharge current of the parallel capacitor C2 flows through the third loop LP3.
  • FIG. 13 is a circuit diagram of the laser diode drive circuit 108 according to the eighth embodiment.
  • the laser diode drive circuit 108 is a circuit in which the drive capacitor C1 in the laser diode drive circuit 105 shown in FIG. 9 is replaced with a DC power supply V1.
  • the operation of the laser diode drive circuit 108 is as follows.
  • the switch element Q1 When the laser diode LD1 is driven, the switch element Q1 is turned on, and the drive current of the laser diode LD1 flows in the path of the DC power supply V1 ⁇ the fourth diode D4 ⁇ the first inductor L1 ⁇ the laser diode LD1 ⁇ the switch element Q1. Further, a charging current flows through the parallel capacitor C2 in the path of the DC power supply V1 ⁇ the fourth diode D4 ⁇ the parallel capacitor C2 ⁇ the switch element Q1. After that, the discharge current of the parallel capacitor C2 flows through the laser diode LD1.
  • Parasitic inductance exists in the second loop LP2 including the switch element Q1, the drive capacitor C1, and the parallel capacitor C2. Due to the action of this parasitic inductance, the voltage of the parallel capacitor C2 may be higher than the voltage of the drive capacitor C1. At this time, the fourth diode D4 prevents the discharge current of the parallel capacitor C2 from flowing to the DC power supply V1 side.
  • the first inductor L1 shown in each embodiment may be composed of the parasitic inductance of the wiring portion related to the laser diode LD1. Further, the combined inductance of the inductor and the parasitic inductance may be used as the first inductor L1.
  • the parallel capacitor C2 shown in each embodiment may be composed of the parasitic capacitance of the wiring portion related to the laser diode LD1. Further, the combined capacitance of the capacitor and the parasitic capacitance may be used as the parallel capacitor C2.

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PCT/JP2020/045892 2020-04-15 2020-12-09 レーザダイオード駆動回路 Ceased WO2021210217A1 (ja)

Priority Applications (5)

Application Number Priority Date Filing Date Title
CN202080094831.3A CN115004490B (zh) 2020-04-15 2020-12-09 激光二极管驱动电路
DE112020006729.7T DE112020006729T5 (de) 2020-04-15 2020-12-09 Laserdiodentreiberschaltung
JP2022515203A JP7396470B2 (ja) 2020-04-15 2020-12-09 レーザダイオード駆動回路
US17/875,962 US20220376472A1 (en) 2020-04-15 2022-07-28 Laser diode driver circuit
JP2023200427A JP7533744B2 (ja) 2020-04-15 2023-11-28 レーザダイオード駆動回路

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JP2020072989 2020-04-15
JP2020-072989 2020-04-15

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US17/875,962 Continuation US20220376472A1 (en) 2020-04-15 2022-07-28 Laser diode driver circuit

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JP7396470B2 (ja) 2023-12-12
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