JPH0231411B2 - - Google Patents
Info
- Publication number
- JPH0231411B2 JPH0231411B2 JP55085593A JP8559380A JPH0231411B2 JP H0231411 B2 JPH0231411 B2 JP H0231411B2 JP 55085593 A JP55085593 A JP 55085593A JP 8559380 A JP8559380 A JP 8559380A JP H0231411 B2 JPH0231411 B2 JP H0231411B2
- Authority
- JP
- Japan
- Prior art keywords
- resistor
- current
- current detection
- transistors
- voltage
- 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
- 238000001514 detection method Methods 0.000 claims description 26
- 238000010586 diagram Methods 0.000 description 4
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
- G05F1/59—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 including plural semiconductor devices as final control devices for a single load
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Automation & Control Theory (AREA)
- Continuous-Control Power Sources That Use Transistors (AREA)
Description
【発明の詳細な説明】
本発明は複数のトランジスタを並列接続したシ
リーズレギユレータ、さらに詳しく云えば該トラ
ンジスタのエミツタに流れる電流値を検出する電
流検出回路を備えるシリーズレギユレータに関す
る。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a series regulator having a plurality of transistors connected in parallel, and more specifically to a series regulator equipped with a current detection circuit for detecting the value of current flowing through the emitters of the transistors.
従来のこの種の電流検出には電源に直列に接続
された、極めて小さな値をもつ比較的高価な抵抗
に生じる電圧降下が利用されている。かかる電流
検出は電流が大きい場合には降下電圧が大きくな
りシリーズレギユレータに用いたときには使用電
圧の範囲を狭める。またこれを避けようとして抵
抗値を小さくする場合は極めて高価な抵抗を用い
たり、複数のこの種の比較的高価な抵抗を並列に
接続して実現せねばならないという欠点があつ
た。 Conventional current sensing of this type utilizes the voltage drop across a relatively expensive resistor of very small value connected in series with the power supply. In such current detection, when the current is large, the voltage drop becomes large, and when used in a series regulator, the range of usable voltage is narrowed. In addition, when reducing the resistance value in order to avoid this, there is a drawback that an extremely expensive resistor must be used or a plurality of relatively expensive resistors of this type must be connected in parallel.
本発明の目的は上述の欠点をなくしたシリーズ
レギユレータを提供することにある。 The object of the invention is to provide a series regulator which eliminates the above-mentioned disadvantages.
前記目的を達成するために本発明によるシリー
ズレギユレータは複数のトランジスタを並列接続
したシリーズレギユレータにおいて、前記トラン
ジスタのエミツタのそれぞれに一端を互に接続し
た等しい抵抗値の電流バランス用抵抗の他端と一
端を互に接続した等しい抵抗値の前記電流バラン
ス用抵抗より充分大きな値の電流検出用補助抵抗
の他端を接続し、前記電流バランス用抵抗と電流
検出用補助抵抗の一端間で前記トランジスタのエ
ミツタ電流の総和を検出するように構成してあ
る。 In order to achieve the above object, a series regulator according to the present invention is a series regulator in which a plurality of transistors are connected in parallel, and includes a current balancing resistor of equal resistance value, one end of which is connected to each emitter of the transistors. Connect the other end of the current detection auxiliary resistor, which has a sufficiently larger value than the current balance resistor with the same resistance value, and connect the other end and one end of the current detection auxiliary resistor to one end of the current detection auxiliary resistor. The device is configured to detect the sum of emitter currents of the transistors.
前記構成によれば従来より使用電圧範囲を広げ
ることができるとともに電流検出用補助抵抗とし
て廉価な抵抗を用いることができ、本発明の目的
を完全に達成することができる。 According to the above configuration, the usable voltage range can be expanded compared to the conventional one, and an inexpensive resistor can be used as the auxiliary resistor for current detection, so that the object of the present invention can be completely achieved.
以下図面を参照して本発明をさらに詳しく説明
する。 The present invention will be explained in more detail below with reference to the drawings.
第１図は従来の電流検出回路を有するシリーズ
レギユレータの一例を示す図である。 FIG. 1 is a diagram showing an example of a series regulator having a conventional current detection circuit.
図において１は制御回路、２は入力端子、３は
出力端子、４，５は電流検出用端子、６（１），
６（２），…６（ｎ）はNPN形トランジスタ、７
（１），７（２），…７（ｎ）は電流バランス用抵
抗、８は電流検出用抵抗であり、制御回路１から
の制御電圧によつてNPNトランジスタ６（１），
６（２），…６（ｎ）はコレクタ電圧（出力端子
３の電圧）が一定となるよう制御される。 In the figure, 1 is a control circuit, 2 is an input terminal, 3 is an output terminal, 4 and 5 are current detection terminals, 6 (1),
6(2),...6(n) are NPN transistors, 7
(1), 7(2),...7(n) are current balance resistors, 8 is a current detection resistor, and depending on the control voltage from the control circuit 1, the NPN transistor 6(1),
6(2), . . . 6(n) are controlled so that the collector voltage (voltage at the output terminal 3) is constant.
NPNトランジスタ６（１），６（２）…６
（ｎ）のエミツタに流れる電流総和は電流検出用
抵抗８に生ずる電圧により検出される。電流バラ
ンス用抵抗７（１），７（２），…７（ｎ）はトラ
ンジスタを並列動作させる際に一般に使用され
る。 NPN transistor 6(1), 6(2)...6
The total current flowing through the emitter (n) is detected by the voltage generated across the current detection resistor 8. Current balancing resistors 7(1), 7(2),...7(n) are generally used when transistors are operated in parallel.
かかる電流検出回路を有するシリーズレギユレ
ータにおいては前述したように電流検出用抵抗８
の両端に生ずる降下電圧分だけ入力端子２に加え
られる電圧範囲が狭められる。またこれを避ける
ためには抵抗値の小さな高価な抵抗を使用した
り、並列に接続して抵抗値を小さくする必要があ
る。 In a series regulator having such a current detection circuit, the current detection resistor 8 is used as described above.
The voltage range applied to input terminal 2 is narrowed by the voltage drop that occurs across both ends of . In order to avoid this, it is necessary to use an expensive resistor with a low resistance value or to connect the resistors in parallel to reduce the resistance value.
第２図は本発明による電流検出回路を有するシ
リーズレギユレータの実施例を示す回路図であ
る。図において１は制御回路、２は入力端子、３
は出力端子、４，５は電流検出端子、６（１），
６（２），…６（ｎ）はNPNトランジスタ、７
（１），７（２），…７（ｎ）は電流バランス用抵
抗、８（１），８（２），…８（ｎ）は電流検出用
補助抵抗である。制御回路１からの制御電圧によ
つてNPNトランジスタ６（１），６（２），…６
（ｎ）のコレクタ電圧（出力端子３の電圧）が一
定となるよう制御され、この時流れるNPNトラ
ンジスタ６（１），６（２），…６（ｎ）の各エミ
ツタ電流は電流バランス用抵抗７（１），７
（２），…７（ｎ）を通り足し合わされて入力端子
２へ流れる。一方、各エミツタに電流検出補助用
抵抗８（１），８（２），…８（ｎ）を接続し他端
を互いに接続して電流検出用端子４とする。数式
を使用して説明するとNPNトランジスタ６
（１），６（２），…６（ｎ）のそれぞれのエミツ
タ電流によつて電流バランス用抵抗７（１），７
（２），…７（ｎ）の両端に発生する電圧をV1，
V2，…Vnとし電流バランス用抵抗７（１），７
（２），…７（ｎ）の抵抗値を等しい値のR1とす
れば総電流Ｉは
Ｉ＝１／R1（V1＋V2＋…＋Vn） …(1)
となる。 FIG. 2 is a circuit diagram showing an embodiment of a series regulator having a current detection circuit according to the present invention. In the figure, 1 is a control circuit, 2 is an input terminal, and 3 is a control circuit.
is an output terminal, 4 and 5 are current detection terminals, 6(1),
6(2),...6(n) are NPN transistors, 7
(1), 7(2), . . . 7(n) are current balancing resistors, and 8(1), 8(2), . . . 8(n) are current detection auxiliary resistors. The NPN transistors 6(1), 6(2),...6 are controlled by the control voltage from the control circuit 1.
The collector voltage (voltage at output terminal 3) of (n) is controlled to be constant, and the emitter current of each NPN transistor 6(1), 6(2),...6(n) flowing at this time is controlled by a current balancing resistor. 7(1),7
(2),...7(n), are added together, and flow to input terminal 2. On the other hand, current detection assisting resistors 8(1), 8(2), . . . 8(n) are connected to each emitter, and the other ends are connected to each other to form a current detection terminal 4. Explaining using formulas, NPN transistor 6
(1), 6(2), ...6(n) by the respective emitter currents of current balancing resistors 7(1), 7
(2),...The voltage generated across the terminals of 7(n) is V 1 ,
V 2 ,...Vn and current balance resistor 7 (1), 7
If the resistance values of (2),...7(n) are set to the same value R1 , the total current I becomes I=1/ R1 ( V1 + V2 +...+Vn)...(1).
一方電流検出用補助抵抗８（１），８（２），…
８（ｎ）の抵抗値を等しい値のR2とすれば電流
検出用端子４，５間に生ずる開放電圧Ｖは電流バ
ランス特性に影響を及ぼさないようにR2≫R1で
あることを仮定したとき
Ｖ＝１／ｎ（V1＋V2＋…＋Vn） …(2)
となり(1)、(2)式より
Ｖ∝Ｉ …(3)
であるから(2)式の電圧を電流検出用電圧として使
用することができる。 On the other hand, auxiliary resistors for current detection 8(1), 8(2),...
If the resistance value of 8(n) is set to the same value R 2 , it is assumed that the open circuit voltage V generated between current detection terminals 4 and 5 is R 2 ≫ R 1 so as not to affect the current balance characteristics. When V=1/n(V 1 +V 2 +…+Vn) …(2), and from formulas (1) and (2), V∝I…(3) Therefore, the voltage in formula (2) is used for current detection. Can be used as voltage.
以上説明したように本発明においては比較的高
価でかつ無用な降下電圧を生じさせるような電流
検出用抵抗を用いなくとも電流検出を行うことが
できる。ちなみに本発明の構成を採ることにより
電流検出用補助抵抗はバラツキ５％程度の廉価な
ものを使用可能となる。 As described above, in the present invention, current can be detected without using a current detection resistor that is relatively expensive and causes unnecessary voltage drop. Incidentally, by adopting the configuration of the present invention, it is possible to use an inexpensive auxiliary resistor for current detection with a variation of about 5%.
なお本実施例ではNPN形トランジスタの場合
を説明したがPNP形トランジスタにも適用でき
るものである。 In this embodiment, the case of an NPN type transistor has been explained, but the present invention can also be applied to a PNP type transistor.
第１図は従来のシリーズレギユレータの一例を
示す回路図、第２図は本発明によるシリーズレギ
ユレータの具体例を示す回路図である。
１……制御回路、２……入力端子、３……出力
端子、４，５……電流検出用端子、６（１），６
（２），…６（ｎ）……NPNトランジスタ、７
（１），７（２），…７（ｎ）……電流バランス用
抵抗、８……電流検出用抵抗、８（１），８
（２），…８（ｎ）……電流検出用補助抵抗。
FIG. 1 is a circuit diagram showing an example of a conventional series regulator, and FIG. 2 is a circuit diagram showing a specific example of a series regulator according to the present invention. 1... Control circuit, 2... Input terminal, 3... Output terminal, 4, 5... Current detection terminal, 6 (1), 6
(2),...6(n)...NPN transistor, 7
(1), 7(2),...7(n)... Resistor for current balance, 8... Resistor for current detection, 8(1), 8
(2),...8(n)...Auxiliary resistor for current detection.
Claims (1)
レギユレータにおいて、前記トランジスタのエミ
ツタのそれぞれに、一端を互に接続した等しい抵
抗値の電流バランス用抵抗の他端と一端を互に接
続した等しい抵抗値の前記電流バランス用抵抗よ
り充分大きな値の電流検出用補助抵抗の他端を接
続し、前記電流バランス用抵抗と電流検出用補助
抵抗の一端間で前記トランジスタのエミツタ電流
の総和を検出するように構成したシリーズレギユ
レータ。1. In a series regulator in which a plurality of transistors are connected in parallel, each of the emitters of the transistors is connected to the other end of a current balancing resistor of equal resistance value whose one end is connected to each other, and the other end of a current balance resistor of equal resistance value whose one end is connected to each other. The other end of the current detection auxiliary resistor having a sufficiently larger value than the current balancing resistor is connected, and the sum of the emitter currents of the transistors is detected between the current balancing resistor and one end of the current detecting auxiliary resistor. series regulator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8559380A JPS5710817A (en) | 1980-06-24 | 1980-06-24 | Series regulator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8559380A JPS5710817A (en) | 1980-06-24 | 1980-06-24 | Series regulator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5710817A JPS5710817A (en) | 1982-01-20 |
| JPH0231411B2 true JPH0231411B2 (en) | 1990-07-13 |
Family
ID=13863112
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8559380A Granted JPS5710817A (en) | 1980-06-24 | 1980-06-24 | Series regulator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5710817A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04106906U (en) * | 1991-02-22 | 1992-09-16 | 株式会社クボタ | Seedling supply structure of riding rice transplanter |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5540468B2 (en) * | 1973-12-28 | 1980-10-17 |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5540468U (en) * | 1978-09-06 | 1980-03-15 |
-
1980
- 1980-06-24 JP JP8559380A patent/JPS5710817A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5540468B2 (en) * | 1973-12-28 | 1980-10-17 |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04106906U (en) * | 1991-02-22 | 1992-09-16 | 株式会社クボタ | Seedling supply structure of riding rice transplanter |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5710817A (en) | 1982-01-20 |
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