JPS5940316B2 - Pulse laser diode drive circuit - Google Patents
Pulse laser diode drive circuitInfo
- Publication number
- JPS5940316B2 JPS5940316B2 JP10030079A JP10030079A JPS5940316B2 JP S5940316 B2 JPS5940316 B2 JP S5940316B2 JP 10030079 A JP10030079 A JP 10030079A JP 10030079 A JP10030079 A JP 10030079A JP S5940316 B2 JPS5940316 B2 JP S5940316B2
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- laser diode
- scr
- resonant
- circuit
- 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.)
- Expired
Links
- 239000003990 capacitor Substances 0.000 claims description 15
- 238000007599 discharging Methods 0.000 claims description 4
- 238000013016 damping Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000015556 catabolic process Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
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
- 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
Landscapes
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Optics & Photonics (AREA)
- Semiconductor Lasers (AREA)
Description
【発明の詳細な説明】
本発明は半導体パルスレーザダイオードをパルス、駆動
する回路に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a circuit that pulses and drives a semiconductor pulsed laser diode.
従来のノタルスレーザダイオード、駆動回路の一例を第
１図に示す。An example of a conventional Notarus laser diode and drive circuit is shown in FIG.
印加電圧端子Ｔに加えられた電圧ＶＨを昇圧用コイル１
及び電圧ホールドダイオード２の昇圧回路部によつて昇
圧して充放電コンデンサ３に加えて充電を行い、このコ
ンデンサ３に蓄えられた電荷をＳＣＲ５のスイッチング
によりパルスレーザダイオード４に放電電流ＩＤとして
流すように構成されている。ＳＣＲ５のスイッチングは
、トリガパルス入力端子６に入力されるパャス信号に従
つて行われる。上記コンデンサ３に充電電圧として加わ
る電圧は、ＳＣＲ５のスイッチングによる急激な電圧変
化を利用して昇圧コイル１で昇圧され、電圧ホールドダ
イオード２によつてピークホールドされる。The voltage VH applied to the applied voltage terminal T is boosted by the boosting coil 1.
The voltage is boosted by the booster circuit section of the voltage hold diode 2 and charged in addition to the charging/discharging capacitor 3, and the charge stored in the capacitor 3 is caused to flow through the pulsed laser diode 4 as a discharge current ID by switching the SCR 5. It is composed of Switching of the SCR 5 is performed according to a pass signal input to the trigger pulse input terminal 6. The voltage applied to the capacitor 3 as a charging voltage is boosted by the booster coil 1 using rapid voltage changes caused by switching of the SCR 5, and held at its peak by the voltage hold diode 2.
′この回路構成では、ＳＣＲ５と印加電圧端子７の間に
ほとんど直流抵抗成分がないため、印加電圧ＶＨによつ
て流れる電流が、ＳＣＲ５の保持電流以上となり、ＳＣ
Ｒ５のターンオフミスが生じ直流電流が流れてＳＣＲ５
やパルスレーザダイオード４が破損するという欠点があ
つた。また、第２図に示す例では、第１図の構成に対し
印加電圧ＶＨによる電流が、ＳＣＲ５の保持電流以下に
なるように電流制限抵抗９を付加してぉり、ＳＣＲ５の
ターンオフミスは生じなくなるが、上記電流制限抵抗９
は昇圧用コイル１による昇圧効果を抑制するダンピング
律抗として働くため昇圧効果が大幅に減少し高い印加電
圧ＶＨが必要となるという欠点があつた。'In this circuit configuration, there is almost no DC resistance component between the SCR5 and the applied voltage terminal 7, so the current flowing due to the applied voltage VH exceeds the holding current of the SCR5, and the SC
Turn-off mistake of R5 occurs and DC current flows, causing SCR5
There were disadvantages in that the pulse laser diode 4 was damaged. In addition, in the example shown in FIG. 2, a current limiting resistor 9 is added to the configuration shown in FIG. 1 so that the current due to the applied voltage VH is equal to or less than the holding current of the SCR 5, so that a turn-off error of the SCR 5 does not occur. However, the current limiting resistor 9
Since it acts as a damping resistor to suppress the boosting effect of the boosting coil 1, there is a drawback that the boosting effect is greatly reduced and a high applied voltage VH is required.
本発明は、これらの欠点を除去するため、ＳＣＲのター
ンオフミス防止用の共振回路を付加することにより、昇
圧回路部の昇圧効果を損うことな＜確実にＳＣＲのター
ンオフを実行可能な高性能のパルスレーザダイオード駆
動回路を提供しようとするものである。In order to eliminate these drawbacks, the present invention adds a resonant circuit to prevent SCR turn-off mistakes, thereby achieving high performance that can reliably turn off the SCR without impairing the boost effect of the boost circuit. The present invention aims to provide a pulsed laser diode drive circuit.
以下図面について詳細に説明する。第３図に本発明の一
実施例を示す。The drawings will be explained in detail below. FIG. 3 shows an embodiment of the present invention.
この図において、充放電コンデンサ３と並列に、共振用
コイル１０、共振用コンデンサ１１及びダンピング用抵
抗１２で構成される共振回路１３を付加してある。な始
、その他の構成は第１図の場合と同様である。以上の構
成において、印加電圧７から、昇圧用コイル１及び電圧
ホールドダイオード２の昇圧回路部を介して充放電コン
デンサ３に充電を行い、上記コンデンサ３に蓄えられた
電荷をＳＣＲ５のスイツチングによつてパルスレーザダ
イオード４に放電電流１。In this figure, a resonant circuit 13 composed of a resonant coil 10, a resonant capacitor 11, and a damping resistor 12 is added in parallel with the charging/discharging capacitor 3. From the beginning, the other configurations are the same as those shown in FIG. In the above configuration, the charge/discharge capacitor 3 is charged from the applied voltage 7 through the boost circuit section of the boost coil 1 and the voltage hold diode 2, and the charge stored in the capacitor 3 is transferred by switching the SCR 5. Discharge current 1 to pulsed laser diode 4.
として流すことにより上記パルスレーザダイオード４を
駆動する。ＳＣＲ５は、トリガパルス入力端子６に入力
されるパルス信号によつてスイツチングする。このスイ
ツチングによる急激な電圧変化を利用して、昇圧用コイ
ル１及び電圧ホールドダイオード２で印加電圧の昇圧を
行い、かつ、共振用コイル１０、共振用コンデンサ１１
、ダンピング用抵抗１２で構成される共振回路１３に振
動を生じさせる。この振動によつてＳＣＲ５の陽極には
次に説明するようにＳＣＲのターンオフに必要な時間以
上にわたつて正電圧が印加されないようになる。第３図
に示した実施回路におけるＳＣＲ５の陽極電圧波形を第
４図に示す。The above-mentioned pulsed laser diode 4 is driven by causing the pulsed laser diode 4 to flow as follows. The SCR 5 is switched by a pulse signal input to a trigger pulse input terminal 6. Utilizing this rapid voltage change caused by switching, the voltage boosting coil 1 and voltage hold diode 2 boost the applied voltage, and the resonance coil 10 and resonance capacitor 11
, to cause vibration in the resonant circuit 13 composed of the damping resistor 12. This vibration prevents a positive voltage from being applied to the anode of the SCR 5 for a period longer than the time required to turn off the SCR, as will be explained below. FIG. 4 shows the anode voltage waveform of SCR 5 in the implementation circuit shown in FIG. 3.
横軸に時間ｔ、縦軸にＳＣＲの陽極電圧Ｖをとり、ＳＣ
Ｒ５のスイツチングが終つた時点から次のスイツチング
が始まるまでのＳＣＲ５に印加される電圧波形を表わし
ている。ＳＣＲ５の陽極電圧波形は、上記共振回路１３
を付加しない場合の点線で示す電圧波形１４の上に、上
記共振回路１３の振動が重畳されたかたちの電圧波形１
５となり、ＳＣＲ５の陽極ＩｌＣは上記コンデンサ３と
上記昇圧用コイル１及び上記共振回路１３で決定される
時間τだけ正電圧が印加されない。パルスレーザダイオ
ード駆動回路等に使用する高速ＳＣＲでは、ターンオフ
が完了するに必要な時間は１０〜３０μｓであるので、
上記時間τが４０μｓ以上となるように上記共振回路１
３の定数を調整すれば完全にターンオフが終了するまで
ＳＣＲ５の陽極に正電圧が印加されないのでターンオフ
ミスを防ぐことができる。The horizontal axis is time t, the vertical axis is SCR anode voltage V, and SC
It represents the voltage waveform applied to SCR5 from the time when switching of R5 ends until the next switching starts. The anode voltage waveform of SCR5 is the same as that of the resonant circuit 13.
Voltage waveform 1 in which the vibration of the resonant circuit 13 is superimposed on the voltage waveform 14 shown by the dotted line without adding
5, and no positive voltage is applied to the anode IlC of the SCR 5 for a time τ determined by the capacitor 3, the boosting coil 1, and the resonant circuit 13. In high-speed SCRs used in pulsed laser diode drive circuits, etc., the time required to complete turn-off is 10 to 30 μs.
The above-mentioned resonant circuit 1
By adjusting the constant 3, no positive voltage will be applied to the anode of the SCR 5 until the turn-off is completely completed, thereby preventing turn-off errors.
また、本実施回路では上記ダンピング用抵抗１２の値を
大きくすることにより、第５図に示すように充電が完了
して一定の電圧ＶＡに達する前に上記共振回路１３によ
る振動を減衰させ、ＳＣＲ５の陽極及び上記充放電用コ
ンデンサ３及び上記共振回路１３に印加される最大ピー
ク電圧を低下させることができるので、耐圧の低い部品
を使用できる。In addition, in this embodiment circuit, by increasing the value of the damping resistor 12, as shown in FIG. Since the maximum peak voltage applied to the anode, the charging/discharging capacitor 3, and the resonant circuit 13 can be lowered, parts with low breakdown voltage can be used.
なお、ダンピング用抵抗１２としては共振用コイル１０
自体の抵抗分を利用してもよいことは明らかである。Note that the damping resistor 12 is a resonance coil 10.
It is clear that the resistance itself may be used.
以上のように、本発明のパルスレーザダイオード駆動回
路によれば、ＳＣＲのターンオフミスを防ぐことができ
、かつ印加電圧の昇圧効果が大であるので部品を破損す
ることなく安全で、かつ低い印加電圧により大きな駆動
パルス電流でパルスレーザダイオードを駆動できる利点
がある。As described above, according to the pulsed laser diode drive circuit of the present invention, it is possible to prevent SCR turn-off errors, and the boosting effect of the applied voltage is large, so that it is safe and low voltage is applied without damaging the components. There is an advantage that the pulsed laser diode can be driven with a large driving pulse current by voltage.
第１図は従来のパルスレーザダイオード駆動回路の一例
を示す回路図、第２図は従来のものの他の例を示す回路
図、第３図は本発明に係るパルスレーザダイオード駆動
回路の一実施例を示す回路図、第４図は第３図の実施回
路のＳＣＲ陽極電圧波形の一例を示す波形図、第５図は
第３図の実施回路のＳＣＲ陽極電圧波形の他の例を示す
波形図である。
１・・・昇圧用コイル、２・・・電圧ホールドダイオー
ド、３・・・充放電コンデンサ、４・・・パルスレーザ
ダイオード、５・・・ＳＣＲ，６・・・トリガパルス入
力端子、７・・・印加電圧端子、９・・・電流制限抵楓
１０・・・共振用コイル、１１・・・共振用コンデン
サ、１２・・・ダンピング用抵抗、１３・・・共振回路
、１４・・・共振回路を付加しないときのＳＣＲの陽極
電圧波形、１５・・・共振回路を付加したときのＳＣＲ
陽極電圧波形、・・・印加電圧、ＩＯ・・・放電電流。FIG. 1 is a circuit diagram showing an example of a conventional pulsed laser diode drive circuit, FIG. 2 is a circuit diagram showing another example of the conventional one, and FIG. 3 is an embodiment of a pulsed laser diode drive circuit according to the present invention. 4 is a waveform diagram showing an example of the SCR anode voltage waveform of the implemented circuit of FIG. 3, and FIG. 5 is a waveform diagram showing another example of the SCR anode voltage waveform of the implemented circuit of FIG. 3. It is. DESCRIPTION OF SYMBOLS 1... Boost coil, 2... Voltage hold diode, 3... Charge/discharge capacitor, 4... Pulse laser diode, 5... SCR, 6... Trigger pulse input terminal, 7...・Applied voltage terminal, 9... Current limiting resistor 10... Resonant coil, 11... Resonant capacitor, 12... Damping resistor, 13... Resonant circuit, 14... Resonant circuit Anode voltage waveform of SCR when not adding 15... SCR when adding resonant circuit
Anode voltage waveform,...applied voltage, IO...discharge current.
Claims (1)
イッチングによつてパルスレーザダイオードに放電電流
として流すことによりパルスレーザダイオードを駆動す
るパルスレーザダイオード駆動回路において、充電電圧
を昇圧するための昇圧用コイルと電圧ホールドダイオー
ドとからなる昇圧回路部に、前記ＳＣＲが完全にターン
オフするまでＳＣＲ陽極に放電電圧が加わらないように
するための共振用コイル及び共振用コンデンサを有する
共振回路を付加したことを特徴とするパルスレーザダイ
オード駆動回路。1. A boosting coil for boosting the charging voltage in a pulsed laser diode drive circuit that drives a pulsed laser diode by passing the charge of a charged charging/discharging capacitor as a discharge current through SCR switching. and a voltage hold diode, a resonant circuit having a resonant coil and a resonant capacitor is added to the booster circuit section, which includes a resonant coil and a resonant capacitor to prevent discharge voltage from being applied to the SCR anode until the SCR is completely turned off. Pulsed laser diode drive circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10030079A JPS5940316B2 (en) | 1979-08-08 | 1979-08-08 | Pulse laser diode drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10030079A JPS5940316B2 (en) | 1979-08-08 | 1979-08-08 | Pulse laser diode drive circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5624990A JPS5624990A (en) | 1981-03-10 |
| JPS5940316B2 true JPS5940316B2 (en) | 1984-09-29 |
Family
ID=14270310
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10030079A Expired JPS5940316B2 (en) | 1979-08-08 | 1979-08-08 | Pulse laser diode drive circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5940316B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0367618U (en) * | 1989-11-05 | 1991-07-02 |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10041079A1 (en) * | 2000-08-22 | 2002-03-14 | Osram Opto Semiconductors Gmbh | Laser module with control circuit |
| US9368936B1 (en) | 2013-09-30 | 2016-06-14 | Google Inc. | Laser diode firing system |
| JP6569236B2 (en) * | 2015-02-18 | 2019-09-04 | 株式会社豊田中央研究所 | Laser diode drive circuit and laser radar device |
| US10256605B2 (en) | 2016-10-14 | 2019-04-09 | Waymo Llc | GaNFET as energy store for fast laser pulser |
| DE112020006729T5 (en) * | 2020-04-15 | 2022-12-01 | Murata Manufacturing Co., Ltd. | LASER DIODE DRIVER CIRCUIT |
-
1979
- 1979-08-08 JP JP10030079A patent/JPS5940316B2/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0367618U (en) * | 1989-11-05 | 1991-07-02 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5624990A (en) | 1981-03-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4823056A (en) | Pulse-width modulation drive circuit | |
| US3662245A (en) | Control circuit for energizing the windings of multi-phase step motors including a two level supply voltage | |
| US5852358A (en) | Capactive power circuit | |
| JPS5940316B2 (en) | Pulse laser diode drive circuit | |
| US5523632A (en) | Method and device to recover energy from driving inductive loads | |
| JPS63204814A (en) | Power transistor drive circuit | |
| US4352054A (en) | Method for actuating a switching transistor operating as a setting member in a DC/DC converter | |
| US4675543A (en) | Drive circuit for gate turnoff thyristor | |
| US4520279A (en) | Series transistor chopper | |
| US4262213A (en) | Universal power module | |
| JP3469455B2 (en) | Switching power supply | |
| US3394272A (en) | Pulse generator | |
| JP2709145B2 (en) | Engine stop device | |
| JP2771605B2 (en) | Charge / discharge control circuit | |
| US6194951B1 (en) | Method and device for diving an integrated power output stage | |
| JP3559051B2 (en) | Relay drive circuit | |
| JPH0212365Y2 (en) | ||
| JPS58175997A (en) | Drive circuit for stepping motor | |
| JPH0638588A (en) | Inductive load driving apparatus | |
| SU752758A1 (en) | Square pulse shaper | |
| US3539832A (en) | Switching means employing unidirectional signal translating device | |
| JP2601724Y2 (en) | Starting circuit | |
| JPH04150516A (en) | Inductance load driving circuit | |
| SU437205A1 (en) | Pulse shaper | |
| JPS6176026A (en) | Preventive circuit for inrush current |