JPS61260313A - Current limit priority type constant current power supply circuit - Google Patents
Current limit priority type constant current power supply circuitInfo
- Publication number
- JPS61260313A JPS61260313A JP10160285A JP10160285A JPS61260313A JP S61260313 A JPS61260313 A JP S61260313A JP 10160285 A JP10160285 A JP 10160285A JP 10160285 A JP10160285 A JP 10160285A JP S61260313 A JPS61260313 A JP S61260313A
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- constant current
- load
- limit
- source
- 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.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
- G05F1/565—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices sensing a condition of the system or its load in addition to means responsive to deviations in the output of the system, e.g. current, voltage, power factor
- G05F1/569—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices sensing a condition of the system or its load in addition to means responsive to deviations in the output of the system, e.g. current, voltage, power factor for protection
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
- G05F1/565—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices sensing a condition of the system or its load in addition to means responsive to deviations in the output of the system, e.g. current, voltage, power factor
- G05F1/569—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices sensing a condition of the system or its load in addition to means responsive to deviations in the output of the system, e.g. current, voltage, power factor for protection
- G05F1/573—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices sensing a condition of the system or its load in addition to means responsive to deviations in the output of the system, e.g. current, voltage, power factor for protection with overcurrent detector
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Automation & Control Theory (AREA)
- Control Of Voltage And Current In General (AREA)
Abstract
Description
【発明の詳細な説明】
〔発明の技術分野〕
本発明は半導体装置の試験を行なう場合などに用いて適
する電流リミット優先型定電流源装置に関する。DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a current limit priority constant current source device suitable for use in testing semiconductor devices.
従来の電圧＋） ミッタ付定電流源装置の一例は第２図
に示される。これは電流値を設定するＤ／Ａ （デジタ
ル−アナログ）コンバータ１と、定電流を供給する定電
流源２と、その出力ラインにダイオード３．．３．で接
続された正電圧リミット用、負電圧リミット用プログラ
マブル定電圧源４，５から構成されている。６は被測定
物等の負荷である。An example of a conventional constant current source device with a voltage +) mitter is shown in FIG. This consists of a D/A (digital-to-analog) converter 1 that sets a current value, a constant current source 2 that supplies a constant current, and a diode 3 on its output line. ．． 3. It consists of programmable constant voltage sources 4 and 5 for positive voltage limit and negative voltage limit connected together. 6 is a load such as an object to be measured.
この本のは、Ｄ／Ａコン・々−タ１で設定された電流値
が定電流源２から対接地間負荷６に供給された場合、そ
の出力電圧がプログラマブル電圧源４で任意設定された
リミット電圧以下であれば、負荷にその電流量ａが流れ
るが、リミット電圧を越える場合、その越える分の電流
量すがダイオード３□を通して定電圧源４に吸収されて
、負荷６に流れる電流が制限され、出力電圧はリミット
電圧にダイオード分の約０．６ ｖ加算された電圧に制
限される。In this book, when the current value set by D/A converter 1 is supplied from constant current source 2 to grounding load 6, the output voltage can be arbitrarily set by programmable voltage source 4. If it is below the limit voltage, the current amount a flows through the load, but if it exceeds the limit voltage, the excess current amount is absorbed by the constant voltage source 4 through the diode 3□, and the current flowing into the load 6 is reduced. The output voltage is limited to the limit voltage plus about 0.6 V for the diode.
上記のものＫあっては、第２図のように負荷６が対接地
間であれば問題ないが、ＩＣ（集積回路）テスタに使用
する場合は、第３図のように負荷に相当する被測定物は
対接地とは限らず、リミット電圧以上に高い外部電源回
路７に接続された場合、出力電圧をリミット電圧以内に
制限しようとして、ダイオードを通して定電圧源４に大
きい電流が流れ、負荷（被測定物）６を破損または焼損
してしまう欠点がある。また電圧リミッタは定電流源を
上回る電流容量が必要なため、ス（−スフアクタが大で
ある。With the above K, there is no problem if the load 6 is between ground as shown in Fig. 2, but when used in an IC (integrated circuit) tester, the load 6 is connected to the ground as shown in Fig. 3. The object to be measured is not necessarily connected to the ground, but if it is connected to an external power supply circuit 7 whose voltage is higher than the limit voltage, a large current flows through the diode to the constant voltage source 4 in an attempt to limit the output voltage to within the limit voltage, and the load ( There is a drawback that the object to be measured (6) may be damaged or burnt out. Furthermore, since a voltage limiter requires a current capacity greater than that of a constant current source, its space factor is large.
本発明は上記実情に鑑みてなされたものであって、定電
流源は負荷に発生する電圧を、任意に設定した電圧以上
に上がらないように電流制限させる。対接地間負荷はも
とより、リミット電圧以上に高い電流回路に接続された
場合も、そこに流れる電流量は定電流源の電流設定値か
ら零付近に移行せしめ、負荷の保護を目的とする電流リ
ミット優先型定電流源装置を提供しようとするものであ
る。The present invention has been made in view of the above-mentioned circumstances, and the constant current source limits the current so that the voltage generated in the load does not rise above an arbitrarily set voltage. Not only is the load connected to ground, but even when connected to a circuit with a current higher than the limit voltage, the amount of current flowing there shifts from the current setting value of the constant current source to near zero, and the current limit is set for the purpose of protecting the load. The present invention aims to provide a priority type constant current source device.
本発明は、負荷に電流を供給する定電流源と、この定電
流源の出力電圧（負荷電圧）を制限するプログラマブル
電圧源で構成される定電流源装置でありて、前記定電流
源は、前記負荷が異常電°源に接続された場合前記定電
流源の電流値を、前記プログラマブル電圧源によシ設定
値から零またはその付近に移行させるようにしたもので
ある。The present invention is a constant current source device comprising a constant current source that supplies current to a load and a programmable voltage source that limits the output voltage (load voltage) of the constant current source, the constant current source comprising: When the load is connected to an abnormal power source, the current value of the constant current source is caused to shift from a set value to zero or around zero using the programmable voltage source.
以下図面を参照して本発明の一実施例を説明する。第１
図において１ノは正リミット電圧検出回路、１２は負リ
ミット電圧検出回路、１３は電圧リミッタ制御回路、１
４は定電流源、１５は負荷である。リミット電圧検出回
路１１゜１２、電圧リミッタ制御回路１３は、本発明で
いうプログラマブル電圧源を構成する。定電流源１４の
出力電圧がリミット電圧検出回路１１゜１２の入力１６
に接続されている。１７．。An embodiment of the present invention will be described below with reference to the drawings. 1st
In the figure, 1 is a positive limit voltage detection circuit, 12 is a negative limit voltage detection circuit, 13 is a voltage limiter control circuit, 1
4 is a constant current source, and 15 is a load. The limit voltage detection circuits 11 and 12 and the voltage limiter control circuit 13 constitute a programmable voltage source according to the present invention. The output voltage of the constant current source 14 is the input 16 of the limit voltage detection circuit 11゜12.
It is connected to the. 17. .
１７、はりミツトする電圧を設定するＤ／Ａコンバータ
、１８１〜１８４はリミット電圧検出抵抗である。１９
□ 、１９．は検出アクタ、２０１〜２０４は該検出ア
ンプの増幅率をきめる抵抗、２１１．２１．は該検出ア
ンプが動作電圧と送電圧のとき、その入出力間を約０．
６ Ｖ Ｉｃクランプするダイオード、２２．．２２．
は検出アンプの入力電圧が必要以上に上がらないように
クランプするダイオードである。２３はホトカプラで、
発光ダイオード側の光量に比例してＦＥＴ側の内部抵抗
が小さくなる。２４は発光ダイオードの電流制限抵抗、
２５はＦＩＴのオン抵抗比較抵抗である。２６は定電流
源１４を制御するアンプ、２７□ 、２７．は該アクタ
の増幅率を決める抵抗である。２８は電流値を設定する
いコン・ぐ−タ、２９は両入力電圧の差に比例した定電
流を与える直流アンプ（電流増幅器）、３０は入力と同
じ電圧を出力に与える電圧フォロワアンプ、３１〜３５
は抵抗である。17, a D/A converter for setting the voltage to be exceeded; 181 to 184 are limit voltage detection resistors; 19
□ , 19. is a detection actor, 201 to 204 are resistors that determine the amplification factor of the detection amplifier, and 211.21. When the detection amplifier is at the operating voltage and the transmission voltage, the voltage between its input and output is about 0.
6 V Ic clamping diode, 22. ．． 22.
is a diode that clamps the input voltage of the detection amplifier to prevent it from rising more than necessary. 23 is a photocoupler,
The internal resistance on the FET side decreases in proportion to the amount of light on the light emitting diode side. 24 is the current limiting resistor of the light emitting diode,
25 is an on-resistance comparison resistor of the FIT. 26 is an amplifier that controls the constant current source 14, 27□, 27. is a resistance that determines the amplification factor of the actor. 28 is a converter for setting the current value, 29 is a DC amplifier (current amplifier) that provides a constant current proportional to the difference between both input voltages, 30 is a voltage follower amplifier that provides the same voltage as the input to the output, 31 ~35
is resistance.
第１図において定電流源１４は、入力３６゜３７の差の
電圧を抵抗３５の両端に発生させて、その分の電流量が
対接地負荷１５に流れ、その両端に電圧を発生させる。In FIG. 1, the constant current source 14 generates a voltage with an input difference of 36.degree. 37 across the resistor 35, and the amount of current flows through the grounded load 15, generating a voltage across the resistor 35.
定電流源１４の出力電圧（負荷電圧）は、電圧フォロワ
アクタ３０を通してリミット電圧検出回路１１．１２の
入力１６に印加される。一方、正リミット電圧検出回路
１１では、Ｄ／Ａコンバータ１７□で入力電圧と逆極性
のＯ〜（−）電圧のリミット電圧を任意に設定する。両
方の電圧を抵抗１８．。The output voltage (load voltage) of the constant current source 14 is applied through the voltage follower actor 30 to the input 16 of the limit voltage detection circuit 11.12. On the other hand, in the positive limit voltage detection circuit 11, the D/A converter 17□ arbitrarily sets a limit voltage of O to (-) voltage of opposite polarity to the input voltage. Both voltages are connected to resistor 18. .
１８、で分圧して、その電圧が接地に対して正電圧のと
き、検出アンプ１９□が抵抗２０１ 。18, and when the voltage is positive with respect to ground, the detection amplifier 19□ connects to the resistor 201.
２０、の比の非反転利得例えば１００倍に増幅されて、
その電圧が抵抗２４を通してホトカプラ２３のＦＥＴの
アノードに印加される。もし検出アンプの入力が負電圧
の時は、その入出力間ヲ０．６ Ｖにダイオードでクラ
ンプする。またダイオード２２□は検出アンプの入力電
圧が必要以上に上らないようにしている。20, amplified by a non-inverting gain of a ratio of, for example, 100 times,
The voltage is applied to the anode of the FET of photocoupler 23 through resistor 24 . If the input of the detection amplifier is a negative voltage, clamp it to 0.6 V between the input and output with a diode. Furthermore, the diode 22□ prevents the input voltage of the detection amplifier from rising more than necessary.
ＩＪ ミツト電圧検出回路１２は、入力１６が負電圧の
とき前記同様に逆極性電圧で動作し、ホトカプラ２３の
ダイオード側のカソードに印加される。ホトカプラ２３
０発光ダイオードの光によりてＦＥＴはオンになり、そ
の内部抵抗が下がる。そし・て抵抗２５とで分圧された
電圧がアング２６で、抵抗２７．．２７．の比１．１倍
に非反転増幅されて、定電流源１４の入力３７ｆ入力３
６と同極性の電圧が加わる。その電圧範囲はＱＶから入
力３６の電圧までで、リミット電圧以下においてはホト
カプラ２３のＦＩＴ Ｆｉオフだから、入力３７はＱＶ
である。従ってこの場合、定電流源１４からの電流によ
って出力電圧が例えば＋５．２ｖになったとする。一方
、リミット電圧を＋５ｖに設定したとすると、リミット
電圧検出回路１１のＤ／Ａコンバータ１７゜で−５ｖ出
力されて、検出アンｆ１９□の入力に＋０．ＩＶ加わり
、その出力電圧は倍率１００倍の＋ＩＯＶがホトカプラ
２３の７ノードに、またカソードは負リミット電圧検出
回路１２の検出アンｆ１９．の入力が＋０．６ｖにクラ
ンプされ、入出力間も＋０．６ｖで、合わせて＋１．２
Ｖが印加される。即ち差し引き１０−１．２＝８．８ｖ
”が抵抗２４を通してホトカプラ２３の発光ダイオード
に加わる。アンプ２６はホトカプラ２３のＦＥＴのオン
によって定電流源１４の入力３６．３７間の電圧差を減
少して、負荷１５の電ｉｌＬ′Ｉｋが低下すると出力電
圧はリミット電圧まで下がる。もし負荷１５がリミット
電圧より高い外部電源回路に接続された場合も上記と同
様の制御が行なわれ、電流量は零になるように動作する
。この場合出力電圧の電圧リミットは無視されるもので
ある。When the input 16 is a negative voltage, the IJ voltage detection circuit 12 operates with a reverse polarity voltage as described above, and is applied to the cathode of the photocoupler 23 on the diode side. Photocoupler 23
The FET is turned on by the light from the 0 light emitting diode, and its internal resistance decreases. Then, the voltage divided by resistor 25 is applied to Ang 26, resistor 27. ．． 27. The input 37f input 3 of the constant current source 14 is non-inverted amplified to a ratio of 1.1 times.
A voltage of the same polarity as 6 is applied. The voltage range is from QV to the voltage of input 36, and since FIT Fi of photocoupler 23 is off below the limit voltage, input 37 is QV
It is. Therefore, in this case, assume that the output voltage becomes, for example, +5.2V due to the current from the constant current source 14. On the other hand, if the limit voltage is set to +5V, -5V is output from the D/A converter 17° of the limit voltage detection circuit 11, and +0. IV is applied, and its output voltage is +IOV with a magnification of 100 times to the 7 node of the photocoupler 23, and the cathode is the detection amplifier f19 of the negative limit voltage detection circuit 12. The input is clamped to +0.6v, and the voltage between input and output is also +0.6v, for a total of +1.2
V is applied. That is, subtraction 10-1.2 = 8.8v
” is applied to the light emitting diode of the photocoupler 23 through the resistor 24. The amplifier 26 turns on the FET of the photocoupler 23 to reduce the voltage difference between the inputs 36 and 37 of the constant current source 14, and the voltage ilL'Ik of the load 15 decreases. Then, the output voltage decreases to the limit voltage.If the load 15 is connected to an external power supply circuit higher than the limit voltage, the same control as above is performed and the current amount is reduced to zero.In this case, the output voltage voltage limits are to be ignored.
なお本発明は上記実施例のみに限られず種々の応用が可
能である。例えば実施例ではＩＣテスタ装置に使用する
定電流源の電圧リミッタの場合を仮定して述べたが、他
の定電流源を使用する測定機にも応用できる。Note that the present invention is not limited to the above-mentioned embodiments, and can be applied in various ways. For example, although the embodiment has been described assuming the case of a voltage limiter for a constant current source used in an IC tester device, the present invention can also be applied to measuring instruments using other constant current sources.
以上説明した如く本発明によれば次の如き利点が具備さ
れる。即ちＩＣテスタ等において被測定物は対接地間負
荷とは限らず、リミット電圧より高い電源回路に接続さ
れた場合、その回路を破損または焼損する問題があった
が、本電流リミッタ優先型定電流源装置においては、負
荷がリミット電圧より高い電源回路に接続された場合、
定電流源の電流量を設定値から零に移行せしめ、定電流
源の出力は高インピーダンスだから、被測定物の破損す
る心配もなくなる。またリミット電圧精度も、従来型は
ダイオード分の電圧が加算された値であったが、本発明
においてはＩ） ミツト電圧検出回路の増幅率が高く、
従来型の精度より１０倍以上精度よく抑圧できる。また
スペースファクタも、グログラマブル電圧源は定電流源
の入力を制御するので大きいノ々ワーを必要とせず、ス
ペースを小さくまとめることができるものである・As explained above, the present invention provides the following advantages. In other words, in IC testers, etc., the object to be measured is not necessarily a load to ground, but if it is connected to a power supply circuit with a voltage higher than the limit voltage, there is a problem that the circuit may be damaged or burned out, but this current limiter priority type constant current In power source equipment, if the load is connected to a power circuit with a voltage higher than the limit voltage,
Since the current amount of the constant current source is shifted from the set value to zero, and the output of the constant current source is high impedance, there is no need to worry about damage to the object to be measured. In addition, the limit voltage accuracy was a value obtained by adding the voltage of the diode in the conventional type, but in the present invention, I) the amplification factor of the voltage detection circuit is high,
Suppression can be more than 10 times more accurate than conventional methods. Also, in terms of space factor, since the programmable voltage source controls the input of the constant current source, it does not require a large power supply, and the space can be kept small.
第１図は本発明の一実施例を示す回路構成図、第２図、
第３図は従来装置の構成図である。
１１．１２・・・リミット電圧検出回路、１３・・・電
圧リミッタ制御回路、１４・・・定電流源、１５・・・
負荷。
出願人代理人 弁理士 鈴 江 武 彦第２図
ムFIG. 1 is a circuit configuration diagram showing an embodiment of the present invention, FIG.
FIG. 3 is a configuration diagram of a conventional device. 11.12... Limit voltage detection circuit, 13... Voltage limiter control circuit, 14... Constant current source, 15...
load. Applicant's agent Patent attorney Takehiko Suzue Figure 2
Claims (1)
電圧（負荷電圧）を制限するプログラマブル電圧源で構
成される定電流源装置であって、前記定電流源は、前記
負荷が異常電源に接続された場合前記定電流源の電流値
を、前記プログラマブル電圧源により設定値から零また
はその付近に移行することを特徴とする電流リミット優
先型定電流源装置。A constant current source device comprising a constant current source that supplies current to a load and a programmable voltage source that limits the output voltage (load voltage) of this constant current source, the constant current source A current limit priority type constant current source device, characterized in that when connected to a power source, the current value of the constant current source is shifted from a set value to zero or its vicinity by the programmable voltage source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10160285A JPS61260313A (en) | 1985-05-15 | 1985-05-15 | Current limit priority type constant current power supply circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10160285A JPS61260313A (en) | 1985-05-15 | 1985-05-15 | Current limit priority type constant current power supply circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS61260313A true JPS61260313A (en) | 1986-11-18 |
Family
ID=14304933
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10160285A Pending JPS61260313A (en) | 1985-05-15 | 1985-05-15 | Current limit priority type constant current power supply circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61260313A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0422486A2 (en) * | 1989-10-09 | 1991-04-17 | STMicroelectronics S.r.l. | Negative overvoltage protection circuit, in particular for output stages |
| JP2010035284A (en) * | 2008-07-25 | 2010-02-12 | Denso Corp | Overcurrent protection circuit |
-
1985
- 1985-05-15 JP JP10160285A patent/JPS61260313A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0422486A2 (en) * | 1989-10-09 | 1991-04-17 | STMicroelectronics S.r.l. | Negative overvoltage protection circuit, in particular for output stages |
| JP2010035284A (en) * | 2008-07-25 | 2010-02-12 | Denso Corp | Overcurrent protection circuit |
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