JPH02154489A - Temperature control circuit - Google Patents
Temperature control circuitInfo
- Publication number
- JPH02154489A JPH02154489A JP30933888A JP30933888A JPH02154489A JP H02154489 A JPH02154489 A JP H02154489A JP 30933888 A JP30933888 A JP 30933888A JP 30933888 A JP30933888 A JP 30933888A JP H02154489 A JPH02154489 A JP H02154489A
- Authority
- JP
- Japan
- Prior art keywords
- module
- input terminal
- temperature
- voltage
- control 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.)
- Granted
Links
- 230000010355 oscillation Effects 0.000 claims abstract description 20
- 238000001514 detection method Methods 0.000 claims description 14
- 238000012544 monitoring process Methods 0.000 claims description 9
- 238000006243 chemical reaction Methods 0.000 claims description 8
- 238000001228 spectrum Methods 0.000 abstract description 13
- 230000003287 optical effect Effects 0.000 abstract description 11
- 238000010586 diagram Methods 0.000 description 4
- 238000001816 cooling Methods 0.000 description 3
- 230000017525 heat dissipation Effects 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000005855 radiation Effects 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
- H01S5/06—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium
- H01S5/068—Stabilisation of laser output parameters
- H01S5/0683—Stabilisation of laser output parameters by monitoring the optical output parameters
Landscapes
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Optics & Photonics (AREA)
- Semiconductor Lasers (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、ペルチェ素子の温度制御回路に関し、特にＬ
Ｄモジュールの発振スペクトラムの安定点を維持する回
路に関する。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a temperature control circuit for a Peltier element, and in particular to a temperature control circuit for a Peltier element.
This invention relates to a circuit that maintains a stable point in the oscillation spectrum of a D module.
第５図は、従来のこの種の温度制御回路の構成図である
。参照数字４１は、スイッチングレギュレータ、４２は
休止期間調整端子、４３はスイッチングレギュレータの
出力端子、４４はペルチェ素子、４５は温度検出素子、
４６は基準電圧入力端子、４７は抵抗電圧変換回路であ
る。FIG. 5 is a configuration diagram of a conventional temperature control circuit of this type. Reference number 41 is a switching regulator, 42 is a rest period adjustment terminal, 43 is an output terminal of the switching regulator, 44 is a Peltier element, 45 is a temperature detection element,
46 is a reference voltage input terminal, and 47 is a resistance voltage conversion circuit.
ここで、スイッチングレギュレータ４１は、基準電圧入
力端子４６の電位Ｖｒｅｆと、温度検出素子４５の端子
間電圧ｖｐとの差、つまり、（Ｖｒｅｆ−Ｖｐ）の電圧
差が大きくなると、スイッチングレギュレータ４１の電
流スイッチングのデユーティが増大し、スイッチングレ
ギュレータ４１の出力端子からの電流が増えるという機
能を有する。Here, when the difference between the potential Vref of the reference voltage input terminal 46 and the voltage vp between the terminals of the temperature detection element 45, that is, the voltage difference (Vref-Vp) becomes large, the switching regulator 41 has a current of It has the function of increasing the switching duty and increasing the current from the output terminal of the switching regulator 41.
また、ペルチェ素子４４は、第６図に示すような構造を
有し、端子Ｃより端子り方向へ電流を流すと一方の面、
たとえば、Ａ面が冷却面、３面が放熱面となり、電流の
大きさにより、Ａ面とＢ面の温度差が変化する。電流の
方向を反対にするとＡ面が放熱面、Ｂ面が冷却面となる
。Moreover, the Peltier element 44 has a structure as shown in FIG.
For example, the A side serves as a cooling surface, and the third side serves as a heat dissipation surface, and the temperature difference between the A side and B side changes depending on the magnitude of the current. If the direction of the current is reversed, the A side becomes the heat radiation surface and the B side becomes the cooling surface.
ここで、温度検出素子４５は、温度により、第３図のよ
うに抵抗値が変化する。Here, the resistance value of the temperature detection element 45 changes depending on the temperature as shown in FIG.
第５図において、温度検出素子４５の端子間電圧と基準
電圧入力端子４６の電圧を比較し電位差を抵抗電圧変換
回路４７において増幅し、休止期間調整端子４２に入力
される。そして、温度検出素子４５の端子間電圧と基準
電圧入力端子４６との電位差がなくなるまでペルチェ電
流を流し、ペルチェ素子４４の温度を一定値に近づけよ
うと動作する。In FIG. 5, the voltage between the terminals of the temperature detection element 45 and the voltage at the reference voltage input terminal 46 are compared, and the potential difference is amplified in the resistance voltage conversion circuit 47 and inputted to the rest period adjustment terminal 42. Then, the Peltier current is caused to flow until there is no potential difference between the voltage between the terminals of the temperature detection element 45 and the reference voltage input terminal 46, thereby operating to bring the temperature of the Peltier element 44 close to a constant value.
上述した従来の温度制御回路は、ＬＤ内温度を定に保っ
ているが、ＬＤモジュールの発振安定点は温度に依存す
るのでＬＤモジュールの個々に最適な発振安定点を与え
ることができないという欠点がある。The conventional temperature control circuit described above keeps the internal temperature of the LD constant, but since the oscillation stabilization point of the LD module depends on the temperature, it has the disadvantage that it is not possible to provide an optimal oscillation stabilization point for each LD module. be.
本発明の温度制御回路は、電流スイッチングのデユーテ
ィを制御する休止期間調整端子を有し、かつ出力端子が
ＬＤモジュール内のペルチェ素子の一方に接続されるス
イッチングレギュレータと、ペルチェ素子に接近して設
置され、湿度により抵抗値が変化する温度検出素子と、
該温度検出素子の端子間電圧と比較する基準電圧入力端
子を有する抵抗電圧変換回路に該休止期間調整端子が接
続されて構成される温度制御回路において、抵抗電圧変
換回路および該ＬＤモジュールの駆動回路に発振波形監
視回路が接続されることを特徴とする。The temperature control circuit of the present invention includes a switching regulator that has a rest period adjustment terminal that controls the duty of current switching and whose output terminal is connected to one of the Peltier elements in the LD module, and a switching regulator that is installed close to the Peltier element. temperature sensing element whose resistance value changes depending on humidity;
A temperature control circuit configured by connecting the pause period adjustment terminal to a resistance voltage conversion circuit having a reference voltage input terminal for comparison with a voltage between terminals of the temperature detection element, the resistance voltage conversion circuit and a drive circuit for the LD module. An oscillation waveform monitoring circuit is connected to the oscillation waveform monitoring circuit.
次に、本発明の実施例について図面を参照して説明する
。Next, embodiments of the present invention will be described with reference to the drawings.
第１図は本実施例によるスイッチングレギュレータを用
いた温度制御回路を示すブロック図である。FIG. 1 is a block diagram showing a temperature control circuit using a switching regulator according to this embodiment.
参照数字１はスイッチングレギュレータ、２は休止期間
調整端子、３はスイッチングレギュレタの出力端子、４
はペルチェ素子、５はペルチェ素子に近接する温度検出
素子、６は抵抗電圧変換回路、７はＬＤモジュールの駆
動素子、８は発振波形監視回路、９は基準光スペクトラ
ム、１０は電圧源出力端子である。ここで、スイッチン
グレギュレータ１は、基準電圧入力端子１１の電位Ｖｒ
ｅｆと、温度検出素子５の端子間電圧ｖｐとの差、つま
り、（Ｖｒｅｆ−Ｖｐ）の電圧差が大きくなると、スイ
ッチングレギュレータ１の電流スイッチングのデユーテ
ィが増大し、スイッチングレギュレータ１の出力端子か
らの電流が増えるという機能を有する。Reference number 1 is the switching regulator, 2 is the idle period adjustment terminal, 3 is the output terminal of the switching regulator, 4
is a Peltier element, 5 is a temperature detection element close to the Peltier element, 6 is a resistance voltage conversion circuit, 7 is a drive element for the LD module, 8 is an oscillation waveform monitoring circuit, 9 is a reference optical spectrum, and 10 is a voltage source output terminal. be. Here, the switching regulator 1 has a potential Vr of the reference voltage input terminal 11.
When the difference between ef and the terminal voltage vp of the temperature detection element 5, that is, the voltage difference (Vref - Vp) increases, the current switching duty of the switching regulator 1 increases, and the voltage from the output terminal of the switching regulator 1 increases. It has the function of increasing current.
発振波形監視回路８は、ＬＤモジュールの駆動素子７か
ら出力される発振波形のスペクトラムと基準光スペクト
ラムとを比較する。基準光スペクトラムは第２図のよう
になる。ＬＤモジュールの駆動素子７の出力スペクトラ
ムが基準光スペクトラムの波長λ。において、光出力が
ｐｏ［ｗ］以下の場合は次のようになる。すなわち発振
波形監視回路８が基準光スペクトラムの波形と比較して
波長λ。において光出力Ｐがｐ＜ｐｏになるとき、抵一
抗電圧変換回路６の基準電圧入力端子１１の電位を変動
させるように発振波形監視回路８の出力電圧が変動する
。基準電圧入力端子１１の電位が変動することにより、
ＬＤモジュール内の制御温度が変化する。そして発振波
形監視回路８において、基準光スペクトラムと比較して
波長λ。において光出力ＰがＰ≧Ｐ０になるように、基
準電圧入力端子１１の電位を変動させる。そして、Ｐ≧
Ｐａになったとき、発振スペクトラムの光出力Ｐが最大
になる箇所を捜すために基準電圧入力端子１１の電位を
さらに細かく変動させる。The oscillation waveform monitoring circuit 8 compares the spectrum of the oscillation waveform output from the drive element 7 of the LD module with a reference optical spectrum. The reference light spectrum is as shown in FIG. The output spectrum of the driving element 7 of the LD module is the wavelength λ of the reference light spectrum. In the case where the optical output is less than or equal to po[w], the following is true. That is, the oscillation waveform monitoring circuit 8 compares the waveform of the reference optical spectrum to determine the wavelength λ. When the optical output P becomes p<po, the output voltage of the oscillation waveform monitoring circuit 8 changes so as to change the potential of the reference voltage input terminal 11 of the resistor voltage conversion circuit 6. As the potential of the reference voltage input terminal 11 fluctuates,
The controlled temperature inside the LD module changes. Then, in the oscillation waveform monitoring circuit 8, the wavelength λ is compared with the reference optical spectrum. The potential of the reference voltage input terminal 11 is varied so that the optical output P satisfies P≧P0. And P≧
When the voltage becomes Pa, the potential of the reference voltage input terminal 11 is further finely varied in order to find a point in the oscillation spectrum where the optical output P becomes maximum.
以上説明したように本発明は、ＬＤモジュール内の温度
を変動させることにより、ＬＤモジュルの発振安定点を
決定することができるという効果がある。As explained above, the present invention has the advantage that the stable oscillation point of the LD module can be determined by varying the temperature inside the LD module.
第１図は本発明の温度制御回路の実施例を示すブロック
図、第２図はＬＤモジュールの波長対光出力値を示すグ
ラフ、第３図は、温度検出素子の温度対抵抗値のグラフ
、第４図は、スイッチングレギュレータの休止期間調整
端子の電位対スイッチングレギュレータの電流スイッチ
ングのデユティのグラフ、第５図は、従来の温度制御回
路の例を示すブロック図、第６図は、ペルチェ素子の構
造を示す斜視図である。
１．４１・・・・・・スイッチングレギュレータ、２゜
４２・・・・・休止期間調整端子、３，４３・・・スイ
ッチングレギュレータの出力端子、４，４４・・・・・
・ペルチェ素子、５，４５・・・・・・温度検出素子、
１１゜４６・・・・・・基準電圧入力端子、６，４７・
・・・・・抵抗電圧変換回路、１０．４８・・・・・・
電圧源、７・・・・・・ＬＤモジュールの駆動回路、８
・・・・・発振波形監視回路、９・・・・・・基準光ス
ペクトラム、Ａ・・・・・・ペルチェ素子の冷却面、Ｂ
・・・・・・ペルチェ素子の放熱面、Ｃ２Ｄ・・・・ペ
ルチェ素子の端子、Ｒ・・・・・温度検出素子の抵抗値
、Ｔａ・・・・・・環境温度、Ｄｕｔｙ・・・・・・ス
イッチングレギュレータの電流スイッチングのデユーテ
ィ、Ｒ・・・・・・温度検出素子の抵抗値、Ｖｒｅｆ・
・・・・・基準電圧入力端子の電位、λ・・・・・・波
長、λ。・・・・・基準波長、Ｐ・・・・・・光出力、
Ｐａ・・・・・・基準光出力。FIG. 1 is a block diagram showing an embodiment of the temperature control circuit of the present invention, FIG. 2 is a graph showing the wavelength versus optical output value of the LD module, and FIG. 3 is a graph showing the temperature versus resistance value of the temperature detection element. Fig. 4 is a graph of the potential of the rest period adjustment terminal of the switching regulator versus the current switching duty of the switching regulator, Fig. 5 is a block diagram showing an example of a conventional temperature control circuit, and Fig. 6 is a graph of the Peltier element. FIG. 3 is a perspective view showing the structure. 1.41...Switching regulator, 2゜42...Duration period adjustment terminal, 3,43...Switching regulator output terminal, 4,44...
・Peltier element, 5,45...Temperature detection element,
11゜46...Reference voltage input terminal, 6,47.
...Resistance voltage conversion circuit, 10.48...
Voltage source, 7...LD module drive circuit, 8
...Oscillation waveform monitoring circuit, 9...Reference light spectrum, A...Cooling surface of Peltier element, B
... Heat dissipation surface of Peltier element, C2D ... Terminal of Peltier device, R ... Resistance value of temperature detection element, Ta ... ... Environmental temperature, Duty ...・・Duty of current switching of switching regulator, R ・・Resistance value of temperature detection element, Vref・
...Potential of reference voltage input terminal, λ ...Wavelength, λ. ...Reference wavelength, P... Light output,
Pa...Reference light output.
Claims (1)
端子を有し、かつ出力端子がＬＤモジュール内のペルチ
ェ素子の一方に接続されるスイッチングレギュレータと
、ペルチェ素子に接近して配置され、温度により抵抗値
が変化する温度検出素子と、該温度検出素子の端子間電
圧と比較する基準電圧入力端子を有する抵抗電圧変換回
路に該休止期間調整端子が接続されて構成される温度制
御回路において、抵抗電圧変換回路および該ＬＤモジュ
ールの駆動回路に発振波形監視回路が接続されることを
特徴とする温度制御回路。A switching regulator that has a rest period adjustment terminal that controls the duty of current switching and whose output terminal is connected to one of the Peltier elements in the LD module, and a switching regulator that is placed close to the Peltier element and whose resistance value changes depending on temperature. The temperature control circuit is configured such that the idle period adjustment terminal is connected to a resistance voltage conversion circuit having a temperature detection element for detecting a voltage, and a reference voltage input terminal for comparing with a voltage between the terminals of the temperature detection element. A temperature control circuit characterized in that an oscillation waveform monitoring circuit is connected to a drive circuit of the LD module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63309338A JP2737185B2 (en) | 1988-12-06 | 1988-12-06 | Temperature control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63309338A JP2737185B2 (en) | 1988-12-06 | 1988-12-06 | Temperature control circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02154489A true JPH02154489A (en) | 1990-06-13 |
| JP2737185B2 JP2737185B2 (en) | 1998-04-08 |
Family
ID=17991810
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63309338A Expired - Lifetime JP2737185B2 (en) | 1988-12-06 | 1988-12-06 | Temperature control circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2737185B2 (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63136680A (en) * | 1986-11-28 | 1988-06-08 | Toshiba Corp | Semiconductor laser device |
| JPS63136584A (en) * | 1986-11-27 | 1988-06-08 | Toshiba Corp | Semiconductor laser device |
| JPS63310188A (en) * | 1987-06-12 | 1988-12-19 | Hitachi Ltd | Output controller for laser diode |
-
1988
- 1988-12-06 JP JP63309338A patent/JP2737185B2/en not_active Expired - Lifetime
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63136584A (en) * | 1986-11-27 | 1988-06-08 | Toshiba Corp | Semiconductor laser device |
| JPS63136680A (en) * | 1986-11-28 | 1988-06-08 | Toshiba Corp | Semiconductor laser device |
| JPS63310188A (en) * | 1987-06-12 | 1988-12-19 | Hitachi Ltd | Output controller for laser diode |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2737185B2 (en) | 1998-04-08 |
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