JP2760028B2 - Temperature control circuit - Google Patents
Temperature control circuitInfo
- Publication number
- JP2760028B2 JP2760028B2 JP1086970A JP8697089A JP2760028B2 JP 2760028 B2 JP2760028 B2 JP 2760028B2 JP 1086970 A JP1086970 A JP 1086970A JP 8697089 A JP8697089 A JP 8697089A JP 2760028 B2 JP2760028 B2 JP 2760028B2
- Authority
- JP
- Japan
- Prior art keywords
- temperature
- voltage
- terminal
- laser module
- module
- 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 - Lifetime
Links
- 238000006243 chemical reaction Methods 0.000 claims description 8
- 238000009434 installation Methods 0.000 claims description 5
- 238000001514 detection method Methods 0.000 claims description 4
- 239000004065 semiconductor Substances 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 5
- 238000001816 cooling Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
Landscapes
- Control Of Temperature (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、ペルチエ素子の温度制御回路に関し、特に
半導体レーザ（以下、LDと略記する）モジュール外部の
温度が最適温度付近時にLDモジユールの温度制御を停止
する回路に関するものである。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a temperature control circuit for a Peltier device, and more particularly, to a temperature of an LD module when a temperature outside a semiconductor laser (hereinafter abbreviated as LD) module is near an optimum temperature. It relates to a circuit for stopping control.
第３図は従来の温度制御回路の構成図である。同図に
おいて、１はスイツチングレギユレータ、２は休止期間
調整端子、３はスイツチングレギユレータ１の出力端
子、４はペルチエ素子、５は温度検出素子、６は基準電
圧入力端子、７は抵抗電圧変換回路である。FIG. 3 is a configuration diagram of a conventional temperature control circuit. In the figure, 1 is a switching regulator, 2 is a pause adjusting terminal, 3 is an output terminal of the switching regulator 1, 4 is a Peltier element, 5 is a temperature detecting element, 6 is a reference voltage input terminal, 7 is a reference voltage input terminal. Is a resistance voltage conversion circuit.
ここで、スイツチングレギユレータ１は、基準電圧入
力端子６の電位Vref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
イツチングレギユレータ１の電流スイツチングのデユー
テイが増大し、スイツチングレギユレータ１の出力端子
３からの電流が増えるという機能を有する。また、ペル
チエ素子４は第４図に示すような構造を有し、端子4aか
ら端子4b方向に電流を流すと、一方の面、例えば上面4c
が冷却面，下面4dが放熱面となり、電流の大きさによ
り、上面4cと下面4dとの温度差が変化する。また、電流
の流れる方向を逆とすると、上面4cが放熱面，下面4dが
冷却面となる。さらに温度検出素子５は環境温度Ｔによ
り第２図に示すように抵抗値Ｒが変化する特性を有して
いる。Here, when to quenching the regulation Yu rater 1, the difference between the terminal voltage V p of the reference voltage input potential V ref and the temperature detecting element 5 of the terminal 6, i.e. the voltage difference (V ref -V p) increases, It has a function that the duty of current switching of the switching regulator 1 is increased, and the current from the output terminal 3 of the switching regulator 1 is increased. The Peltier element 4 has a structure as shown in FIG. 4, and when a current flows from the terminal 4a to the terminal 4b, one surface, for example, the upper surface 4c
Is a cooling surface, and the lower surface 4d is a heat radiating surface, and the temperature difference between the upper surface 4c and the lower surface 4d changes depending on the magnitude of the current. When the direction of current flow is reversed, the upper surface 4c is a heat dissipation surface and the lower surface 4d is a cooling surface. Further, the temperature detecting element 5 has a characteristic that the resistance value R changes according to the environmental temperature T as shown in FIG.
このような構成において、温度検出素子５の端子間電
圧Vpと基準電圧入力端子６の電圧Vrefとを比較し、その
電位差を抵抗電圧変換回路７において増幅し、休止期間
調整端子２に入力される。そして、温度検出素子５の端
子間電圧と基準電圧入力端子６との電位差がなくなるま
でペルチエ電流を流し、ペルチエ素子４の温度を一定値
に近づけようと動作する。In such a configuration, compared with a voltage V ref of the terminal voltage V p and the reference voltage input terminal 6 of the temperature detecting element 5, and amplifies the potential difference in the resistance-voltage conversion circuit 7, inputted to the idle period adjustment terminal 2 Is done. Then, a Peltier current flows until the potential difference between the terminal voltage of the temperature detecting element 5 and the reference voltage input terminal 6 disappears, and the temperature of the Peltier element 4 operates to approach a constant value.
従来の温度制御回路は、外部温度が最適温度のとき，
ペルチエ電流は原理的には流れないのであるが、常時LD
モジユールの温度制御をしているので、実際は最適温度
にしようとペルチエ電流を流し続けているという問題が
あつた。The conventional temperature control circuit, when the external temperature is the optimum temperature,
Peltier current does not flow in principle, but always
Since the temperature of the module is controlled, there is a problem that the Peltier current is continuously flowing in order to achieve the optimum temperature.
本発明の温度制御回路は、前述した従来の問題を解決
するためになされたものであり、休止期間調整端子から
の入力に基づき電流スイッチングのデューティを制御し
てLDモジュール内のペルチェ素子に電流を出力するスイ
ッチングレキュレータと、ペルチェ素子に近接して配置
されかつ温度により抵抗値が変化する第１の温度検出素
子と、この第１の温度検出素子の端子間電圧と基準電圧
入力端子の電圧とを比較して休止期間出力端子に出力す
る抵抗電圧変換回路とを備え、さらにLDモジュールの外
部に配置されかつLDモジュールの最適設置温度を検知し
て抵抗電圧変換回路に出力する第２の温度検出素子を備
え、スイッチングレギュレータはLDモジュールの外部温
度が最適設置温度のときスイッチングレギュレータを休
止させる手段を備えている。The temperature control circuit of the present invention has been made to solve the above-described conventional problem, and controls the duty of current switching based on the input from the idle period adjustment terminal to supply current to the Peltier element in the LD module. A switching regenerator for outputting, a first temperature detecting element arranged close to the Peltier element and having a resistance value that changes with temperature, a voltage between terminals of the first temperature detecting element, a voltage of a reference voltage input terminal, And a resistance-to-voltage conversion circuit that outputs the voltage to a pause period output terminal, and further detects the optimum installation temperature of the LD module and outputs the detected temperature to the resistance-to-voltage conversion circuit. The switching regulator is provided with means for stopping the switching regulator when the external temperature of the LD module is at the optimum installation temperature. That.
本発明におけるスイッチングレギュレータは、LDモジ
ュールの外部温度が最適設置温度のとき、ペルチェ素子
に流れる電流を停止させる。The switching regulator according to the present invention stops the current flowing through the Peltier element when the external temperature of the LD module is at the optimum installation temperature.
次に本発明の実施例を図面を参照して説明する。 Next, an embodiment of the present invention will be described with reference to the drawings.
第１図は本発明による温度制御回路の一実施例を示す
ブロック図であり、前述の図と同一部分には同一符号を
付しその説明は省略する。同図において、ペルチエ素子
４に近接して第１の温度検出素子５が配置されるととも
にLDモジユールの外部にはこのLDモジユールの外部温度
を検知する第２の温度検出素子８が設置されている。こ
こで温度検出素子５は、環境温度Ｔにより第２図のよう
に抵抗値Ｒが変化する。FIG. 1 is a block diagram showing an embodiment of a temperature control circuit according to the present invention. In the figure, a first temperature detecting element 5 is arranged close to a Peltier element 4, and a second temperature detecting element 8 for detecting an external temperature of the LD module is provided outside the LD module. . Here, the resistance value R of the temperature detecting element 5 changes according to the environmental temperature T as shown in FIG.
このような構成において、抵抗電圧変換回路７によ
り、温度検出素子５の端子間電圧と基準電圧入力端子６
の電圧とを比較し、これらの電位差を増幅し、休止期間
調整端子２に入力される。そして、温度検出素子５の端
子間電圧Vpと基準電圧入力端子６の電圧Vrefとの電位差
（Vref-Vp）がなくなるまでペルチエ電流を流し、ペル
チエ素子４の温度を一定値に近づけようと動作する。こ
こで、LDモジユールの外部温度がLDモジユールの最適設
定温度に入つているとき、LDモジユールの外部に設置さ
れた第２の温度検出素子８が最適設定温度を検知して抵
抗電圧変換回路７に入力される。そして、休止期間調整
端子２をオフにしてスイッチングレギュレータ１を休止
させ、ペルチェ素子４に流れる電流を停止させる。In such a configuration, the voltage between the terminals of the temperature detecting element 5 and the reference voltage input terminal 6
, And amplifies these potential differences, which are input to the idle period adjustment terminal 2. Then, passing a Peltier current until the potential difference between the voltage V ref of the terminal voltage V p and the reference voltage input terminal 6 of the temperature detecting element 5 (V ref -V p) is eliminated, closer to the temperature of the Peltier element 4 to a constant value Works like so. Here, when the external temperature of the LD module is within the optimal set temperature of the LD module, the second temperature detecting element 8 installed outside the LD module detects the optimal set temperature and sends the signal to the resistance-voltage conversion circuit 7. Is entered. Then, the pause period adjustment terminal 2 is turned off to suspend the switching regulator 1 and stop the current flowing through the Peltier element 4.
以上説明したように本発明は、LDモジユールの外部に
第２の温度検出素子を付加したことにより、LDモジユー
ルの外部温度がLDモジユールの最適設定温度に入つてい
るとき、LDモジユールの外部に設置された第２の温度検
出素子が最適設定温度を検知してペルチエ素子に流れる
電流を停止させ、LDモジユール内のペルチエ素子の信頼
性を大幅に向上するという効果がある。As described above, according to the present invention, by adding the second temperature detecting element to the outside of the LD module, when the outside temperature of the LD module is within the optimum set temperature of the LD module, the second temperature detecting element is installed outside the LD module. The detected second temperature detecting element detects the optimum set temperature, stops the current flowing through the Peltier element, and has the effect of greatly improving the reliability of the Peltier element in the LD module.
第１図は本発明による温度制御回路の一実施例を示すブ
ロック図、第２図は温度検出素子の温度対抵抗値の関係
を示す図、第３図は従来の温度制御回路のブロック図、
第４図はペルチエ素子の構造を示す斜視図である。 １……スイツチングレギユレータ、２……休止期間調整
端子、３……スイツチングレギユレータ１の出力端子、
４……ペルチエ素子、4a,4b……端子、4c……上面、4d
……下面、５……第１の温度検出素子、６……基準電圧
入力端子、７……抵抗電圧変換回路、８……第２の温度
検出素子。FIG. 1 is a block diagram showing an embodiment of a temperature control circuit according to the present invention, FIG. 2 is a diagram showing a relationship between temperature and resistance of a temperature detecting element, FIG. 3 is a block diagram of a conventional temperature control circuit,
FIG. 4 is a perspective view showing the structure of the Peltier element. 1, a switching regulator, an idle period adjustment terminal, an output terminal of a switching regulator 1,
4 ... Peltier element, 4a, 4b ... Terminal, 4c ... Top surface, 4d
... lower surface, 5 ... first temperature detection element, 6 ... reference voltage input terminal, 7 ... resistance voltage conversion circuit, 8 ... second temperature detection element.
Claims (1)
スイッチングのデューティを制御して半導体レーザモジ
ュール内のペルチェ素子に電流を出力するスイッチング
レギュレータと、 前記ペルチェ素子に近接して配置されかつ温度により抵
抗値が変化する第１の温度検出素子と、 前記第１の温度検出素子の端子間電圧と基準電圧入力端
子の電圧とを比較して前記休止期間出力端子に出力する
抵抗電圧変換回路とを備え、 さらに、前記半導体レーザモジュールの外部に配置され
かつ前記半導体レーザモジュールの最適設置温度を検知
して前記抵抗電圧変換回路に出力する第２の温度検出素
子を備え、 前記スイッチングレギュレータは、前記半導体レーザモ
ジュールの外部温度が前記最適設置温度のとき前記スイ
ッチングレギュレータを休止させる手段を備えているこ
とを特徴とする温度制御回路。A switching regulator for controlling a duty of current switching based on an input from a pause period adjusting terminal to output a current to a Peltier element in the semiconductor laser module; A first temperature detection element whose resistance value changes, and a resistance-voltage conversion circuit that compares a voltage between terminals of the first temperature detection element with a voltage of a reference voltage input terminal and outputs the voltage to the idle period output terminal. A second temperature detecting element that is disposed outside the semiconductor laser module and detects an optimum installation temperature of the semiconductor laser module and outputs the detected temperature to the resistance-voltage conversion circuit; Stops the switching regulator when the external temperature of the laser module is at the optimal installation temperature. A temperature control circuit comprising means for causing the temperature to be controlled.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1086970A JP2760028B2 (en) | 1989-04-07 | 1989-04-07 | Temperature control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1086970A JP2760028B2 (en) | 1989-04-07 | 1989-04-07 | Temperature control circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02267610A JPH02267610A (en) | 1990-11-01 |
| JP2760028B2 true JP2760028B2 (en) | 1998-05-28 |
Family
ID=13901732
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1086970A Expired - Lifetime JP2760028B2 (en) | 1989-04-07 | 1989-04-07 | Temperature control circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2760028B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101413350B1 (en) * | 2007-08-14 | 2014-06-30 | 삼성전자주식회사 | In the optical communication system, |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6117116A (en) * | 1984-07-04 | 1986-01-25 | Ricoh Co Ltd | Optical scanner |
| JPH0812568B2 (en) * | 1985-12-19 | 1996-02-07 | 松下電器産業株式会社 | Temperature control device |
| JPS63122817U (en) * | 1987-01-30 | 1988-08-10 |
-
1989
- 1989-04-07 JP JP1086970A patent/JP2760028B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02267610A (en) | 1990-11-01 |
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