JPH0228812A - Constant voltage circuit - Google Patents

Constant voltage circuit

Info

Publication number
JPH0228812A
JPH0228812A JP17963488A JP17963488A JPH0228812A JP H0228812 A JPH0228812 A JP H0228812A JP 17963488 A JP17963488 A JP 17963488A JP 17963488 A JP17963488 A JP 17963488A JP H0228812 A JPH0228812 A JP H0228812A
Authority
JP
Japan
Prior art keywords
resistor
collector
transistor
emitter
output terminal
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
Application number
JP17963488A
Other languages
Japanese (ja)
Other versions
JPH079616B2 (en
Inventor
Fumio Suzuki
文雄 鈴木
Jun Takayama
純 高山
Toshiaki Isogai
俊明 磯貝
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NEC Corp
NEC Engineering Ltd
Original Assignee
NEC Corp
NEC Engineering Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by NEC Corp, NEC Engineering Ltd filed Critical NEC Corp
Priority to JP63179634A priority Critical patent/JPH079616B2/en
Publication of JPH0228812A publication Critical patent/JPH0228812A/en
Publication of JPH079616B2 publication Critical patent/JPH079616B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Abstract

PURPOSE:To easily change an output set voltage value by adding a circuit, for which n pcs. of resistors and n pcs. of diode-connected transistors are serially connected in a regular direction. CONSTITUTION:The constant voltage circuit is connected so that the collector of a transistor (Tr) T1 whose emitter is connected to earth is connected with the base and to one edge of a resistor R1. The other edge of this resistor R1 is connected through a resistor R2 to the collector of a Tr T2 and this emitter is connected through a resistor R3 with the earth. The base of a Tr T3 is con nected to the collector of Tr T2, the emitter is connected to the earth and the collector is connected to an output terminal VR2. In such a case, the n pcs. of resistors R11-R1n and the n pcs. of diode-connected Tr T11-T1n are serially connected between the output terminal VR2 and the connecting point of the resistors R1 and R2. Thus, the voltage value of a high output voltage level can be obtained while a temperature coefficient is kept at zero.

Description

【発明の詳細な説明】 [産業上の利用分野] 本発明は、定電圧回路に関し、特に所望の高電圧を得る
ことができる定電圧回路に関する。
DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a constant voltage circuit, and particularly to a constant voltage circuit that can obtain a desired high voltage.

[従来の技術] 第2図に従来の定電圧回路の実施例を示す。エミッタが
地気に接続され且つベースとコレクタが短絡されたトラ
ンジスタT1 のコレクタは、抵抗器R1の一端に接続
されている。抵抗器R1の他端は、抵抗器R2を介して
、トランジスタT2のコレクタに接続されている。抵抗
器R1と抵抗器R2の接続点は、出力端子VRIに接続
されている。トランジスタT2のエミッタは、抵抗器R
3を介して地気に接続され且つベースは、トランジスタ
T1 のコレクタに接続されてl、%る。トランジスタ
T3のベースは、トランジスタT2のコレクタに接続さ
れ且つエミッタは、地気に接続され且つコレクタは、出
力端子に接続されている。電源VCCは、一端を地気に
接続され且つ他端を、電流源ICcを介して、出力端子
VRIに接続されている。
[Prior Art] FIG. 2 shows an example of a conventional constant voltage circuit. The collector of the transistor T1, whose emitter is connected to ground and whose base and collector are shorted, is connected to one end of the resistor R1. The other end of resistor R1 is connected to the collector of transistor T2 via resistor R2. A connection point between resistor R1 and resistor R2 is connected to output terminal VRI. The emitter of transistor T2 is connected to resistor R
3 to ground, and the base is connected to the collector of transistor T1. The base of transistor T3 is connected to the collector of transistor T2, the emitter is connected to ground, and the collector is connected to the output terminal. The power supply VCC has one end connected to the ground, and the other end connected to the output terminal VRI via the current source ICc.

次に、従来の定電圧回路の動作を説明する。Next, the operation of the conventional constant voltage circuit will be explained.

以下、トランジスタTI 、 I2及びI3は同一の特
性を有し、アーり電圧及び電流増幅率は、無限大として
扱う。
Hereinafter, it is assumed that the transistors TI, I2, and I3 have the same characteristics, and the earth voltage and current amplification factor are infinite.

抵抗器R3の両端の電圧は、トランジスタTI 、 I
2のベース・エミッタ降下電圧V8[1とV8E2の差
(Δv8[)に等しい。ここで熱電圧をV、 = k 
T/ q、抵抗器R1に流れる電流をII 、抵抗器R
3に流れる電流なI2 とするとΔVBEは(1)式で
表わされる。
The voltage across resistor R3 is the voltage across transistors TI, I
2 is equal to the difference (Δv8[) between the base-emitter drop voltage V8[1 and V8E2]. Here, the thermal voltage is V, = k
T/q, current flowing through resistor R1 is II, resistor R
3, ΔVBE is expressed by equation (1).

抵抗器R2の電圧降下V2は(2)式で表わされる。The voltage drop V2 across the resistor R2 is expressed by equation (2).

V2−(R2/ R3)△VBE  ・・・(2)出力
端子VRIの出力電圧レベルVR11は、トランジスタ
T3のベース・エミッタ降下電圧V[]E3と抵抗器R
2の電圧降下v2の和であるから(3)式となる。
V2-(R2/R3)△VBE... (2) The output voltage level VR11 of the output terminal VRI is the base-emitter drop voltage V[]E3 of the transistor T3 and the resistor R.
Since it is the sum of the voltage drops v2 of 2, equation (3) is obtained.

VRII  = VBE3 + (R2/ R+)△V
BE  −(3)(3)式を温度Tで微分すると、(4
)式となる。
VRII = VBE3 + (R2/R+)△V
BE - (3) Differentiating equation (3) with respect to temperature T, we get (4
).

(1)式を同様に温度Tで微分すると、(5)式となる
When equation (1) is similarly differentiated with respect to temperature T, equation (5) is obtained.

ここで■l/ I2は零温度係数とすると(5)式は(
6)式となる。
Here, if ■l/I2 is a zero temperature coefficient, equation (5) becomes (
6) Equation becomes.

(4) (8)式より 通常トランジスタのベース・エミッタ電圧V8Fは負の
温度係数を持っている。
(4) From equation (8), the base-emitter voltage V8F of a normal transistor has a negative temperature coefficient.

とすればよい。And it is sufficient.

また、抵抗器R1の電圧降下v1 と抵抗器R2の電圧
降下V2 を等しくなる様に設定し、V1= V2 =
 R+ Il= R2I2よって h / I2= R2/ R1・・・(9)であり、(
9)式を(8)式に代入すると(10)式が導きだせる
Also, the voltage drop v1 of resistor R1 and the voltage drop V2 of resistor R2 are set to be equal, and V1=V2=
R+ Il= R2I2, so h/I2= R2/R1...(9),
By substituting equation (9) into equation (8), equation (10) can be derived.

従って、抵抗器R+ 、R2、R3(R2> R1)を
選択することにより、温度係数が零の出力電圧レベルV
R11を得ることができる。
Therefore, by selecting resistors R+, R2, and R3 (R2>R1), an output voltage level V with a temperature coefficient of zero can be achieved.
R11 can be obtained.

今、C= 2X 10−3(V) 、!=すルトT= 
300(K)  、  VBE3 = 0 、8(V)
として(3)式に代入すると VRII = V[]E3 +2X10−3X T1.
4(V)  ・・・(11) (11)式で表わされた値が温度係数を零とした時の出
力電圧レベルとなる。
Now, C= 2X 10-3(V),! = Surut T =
300 (K), VBE3 = 0, 8 (V)
When substituted into equation (3) as VRII = V[]E3 +2X10-3X T1.
4(V) (11) The value expressed by equation (11) is the output voltage level when the temperature coefficient is zero.

[発明が解決しようとする課題] 上述した従来の定電圧回路は、温度係数を零としたとき
の出力電圧レベルが、(11)式に示したように、約1
.4Vという固定された電圧である。
[Problems to be Solved by the Invention] The conventional constant voltage circuit described above has an output voltage level of about 1 when the temperature coefficient is set to zero, as shown in equation (11).
.. It is a fixed voltage of 4V.

これでは、電源電圧などに使用するには電圧が低すぎる
という欠点がある。
This has the disadvantage that the voltage is too low to be used as a power supply voltage.

[課題を解決するための手段] 本発明は、上述した従来技術の欠点を解決し、所望の高
電圧を簡単な回路変更で得ることができる定電圧回路を
提供することを目的としたものである。
[Means for Solving the Problems] The present invention aims to solve the above-mentioned drawbacks of the prior art and provide a constant voltage circuit that can obtain a desired high voltage by simple circuit changes. be.

本発明の定電圧回路は、上記目的を達成するため、エミ
ッタを地気に接続し且つベースとコレクタを短絡した第
一のトランジスタのコレクタを第一の抵抗器の一端に接
続し、前記第一の抵抗器の他端を第二の抵抗器を介して
第二のトランジスタのコレクタに接続し、前記第二のト
ランジスタのエミッタを第三の抵抗器を介して地気に接
続し、前記第二のトランジスタのベースを前記第一のト
ランジスタのコレクタに接続し、第三のトランジスタの
ベース、エミッタ及びコレクタをそれぞれ前記第二のト
ランジスタのコレクタ、地気及び第一の出力端子に接続
し、前記第一の出力端子と、前記第一の抵抗器と前記第
二の抵抗器との接続点との間にn個の抵抗器とn個のダ
イオード接続されたトランジスタを順方向を向けて直列
に接続し、電源の一端を地気に他端を電流源を介して前
記第一の出力端子に接続し、そして、第二の出力端子を
地気に接続したことを特徴とする。
In order to achieve the above object, the constant voltage circuit of the present invention connects the collector of a first transistor whose emitter is connected to the ground and whose base and collector are short-circuited to one end of a first resistor. The other end of the resistor is connected to the collector of a second transistor through a second resistor, the emitter of the second transistor is connected to ground through a third resistor, and the second The base of the transistor is connected to the collector of the first transistor, the base, emitter and collector of the third transistor are respectively connected to the collector of the second transistor, the ground and the first output terminal, and the base of the third transistor is connected to the collector of the first transistor. n resistors and n diode-connected transistors are connected in series with forward direction between one output terminal and a connection point between the first resistor and the second resistor. One end of the power source is connected to the ground, the other end is connected to the first output terminal via a current source, and the second output terminal is connected to the ground.

[実施例] 次に、本発明について図面を参照して説明する。[Example] Next, the present invention will be explained with reference to the drawings.

第1図は本発明の定電圧回路の一実施例の回路図である
FIG. 1 is a circuit diagram of an embodiment of a constant voltage circuit of the present invention.

エミッタが地気に接続され、ベースとコレクタが短絡さ
れたトランジスタT1 のコレクタは、抵抗器R1の一
端に接続されている。抵抗器R1の他端は、抵抗器R2
を介して、トランジスタT2のコレクタに接続されてい
る。トランジスタT2のエミッタは、抵抗器R3を介し
て、地気と接続され且つベースは、トランジスタT1 
のコレクタに接続されている。トランジスタT3のベー
スは、トランジスタT2のコレクタに接続され且つエミ
ッタは、地気に接続され且つコレクタは、出力端子VR
2に接続されている。コレクタとベースが短絡されたト
ランジスタをダイオード接続のトランジスタと称してい
るが、出力端子VR2と、抵抗器R1と抵抗器R2との
接続点との間にn個の抵抗器R11・・・Rlnとn個
のダイオード接続されたトランジスタT11・・・Tl
nが順方向を向いて直列に接続される。電源VCCは、
一端を地気に接続され且つ他端を、電流源ICCを介し
て出力端子に接続されている。
The collector of the transistor T1, whose emitter is connected to ground and whose base and collector are shorted, is connected to one end of the resistor R1. The other end of resistor R1 is connected to resistor R2.
It is connected to the collector of transistor T2 via. The emitter of transistor T2 is connected to ground through resistor R3, and the base is connected to the ground through resistor R3.
connected to the collector. The base of transistor T3 is connected to the collector of transistor T2, the emitter is connected to ground, and the collector is connected to output terminal VR.
Connected to 2. A transistor whose collector and base are short-circuited is called a diode-connected transistor, but there are n resistors R11...Rln between the output terminal VR2 and the connection point between the resistors R1 and R2. n diode-connected transistors T11...Tl
n are connected in series with the forward direction facing. The power supply VCC is
One end is connected to the ground, and the other end is connected to an output terminal via a current source ICC.

次に、本発明の定電圧回路の動作を説明する。Next, the operation of the constant voltage circuit of the present invention will be explained.

抵抗器R1+・・・Rlnは次式の関係とする。The resistors R1+...Rln have the following relationship.

R++=  ・−= R+n= Ra  −(12)同
様にトランジスタT11  ・・・ Tlnのベース・
エミッタ電圧降下V8E11  ・・・ VB E l
 nを次式の関係とする。
R++= ・-= R+n= Ra − (12) Similarly, the base of transistor T11...Tln
Emitter voltage drop V8E11...VB E l
Let n be in the following relationship.

V8EI+”  ”’  : veεIn= VBEa
  ”°(13)また、トランジスタT、  、  T
2のコレクタ電流をそれぞれII  1 12 とし、
抵抗器R1+  R2の電圧降下をVl  +  V2
 とし、II   I2  ・・・(14) Vl = V2 −(15) 且つ、Raの電圧降下とR1の電圧降下が等しくなる様
に設定し、 Ra (II+  12)= R1eL  −(1B)
前述の(14)(15)(ICり式を満たす様に各抵抗
器の値を選ぶ。
V8EI+” ”’: veεIn=VBEa
”° (13) Also, the transistors T, , T
Let the collector current of 2 be II 1 12 respectively,
The voltage drop across resistor R1 + R2 is Vl + V2
Then, II I2 ... (14) Vl = V2 - (15) And set so that the voltage drop of Ra and the voltage drop of R1 are equal, Ra (II + 12) = R1eL - (1B)
Select the value of each resistor to satisfy the above-mentioned (14) and (15) (IC formulas).

出力端子VR2の出力電圧レベルVR21は、従来方式
の(3)式と同様に、トランジスタT3のベース・エミ
ッタ降下電圧VBE3 と抵抗器R2の全電圧降下V2
 、及び直列に接続された抵抗器とトランジスタの電圧
降下の和であるから(17)式で表わされる。
The output voltage level VR21 of the output terminal VR2 is determined by the base-emitter drop voltage VBE3 of the transistor T3 and the total voltage drop V2 of the resistor R2, as in equation (3) of the conventional method.
, and the voltage drop of the resistor and transistor connected in series, it is expressed by equation (17).

マタ、(15)式より Vl = V2 =  h R
1=  I2 R2であるから、 (1B)(18)式より となる。
From formula (15), Vl = V2 = h R
Since 1=I2 R2, it follows from formula (1B) (18).

Raの値を選ぶと(19)式は で表わされる。When the value of Ra is chosen, equation (19) becomes It is expressed as

また、(14)(15)式より VBE3 = VBEI   VeEa  、 、 、
 (22)テアJ、(21)(22)式を(17)式に
代入するとる。
Also, from equations (14) and (15), VBE3 = VBEI VeEa , ,
(22) Thea J, (21) Let us substitute equations (22) into equation (17).

(23)式の第2項は、前述の従来の定電圧回路の出力
電圧レベルVR11にほかならない。従って(23)式
は次式のように表わせる。
The second term in equation (23) is nothing but the output voltage level VR11 of the conventional constant voltage circuit described above. Therefore, equation (23) can be expressed as the following equation.

VR21=(1+n) VRII  −−・(24)従
って、温度係数を零に保ったまま、上述の従来の定電圧
回路の出力電圧レベルの(1+ n)倍の値が得られる
VR21=(1+n)VRII--(24) Therefore, a value (1+n) times the output voltage level of the above-mentioned conventional constant voltage circuit can be obtained while keeping the temperature coefficient at zero.

[発明の効果] 以上説明したように本発明は、前述した従来の定電圧回
路に、n個の抵抗器とn個のダイオード接続したトラン
ジスタを順方向に直列接続した回路を出力端子と、第一
の抵抗器と第二の抵抗器との接続点との間に追加するこ
とにより、従来の出力電圧レベルの(1+ n)倍の高
い電圧値が温度係数を零に保ったまま得られる。このn
の個数を変えることにより、出力電圧値の設定を簡単に
変化させることもできる。
[Effects of the Invention] As explained above, the present invention adds a circuit in which n resistors and n diode-connected transistors are connected in series in the forward direction to the conventional constant voltage circuit described above. By adding between the connection point of one resistor and the second resistor, a voltage value (1+n) times higher than the conventional output voltage level can be obtained while keeping the temperature coefficient at zero. This n
By changing the number of the output voltage values, the setting of the output voltage value can be easily changed.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は、本発明の定電圧回路の一実施例の回路図、第
2図は、従来の定電圧回路の回路図である。 Vcc:電源 Ice:電流源 T1. T2 、 T3. T++ ・・・Tan二)
ランジスタR+ 、 R2、R3、Ru =−Ran 
:抵抗器VRI + VR2:出力端子 VRII  、  VR21:出力電圧レベル11、I
2:電流 Vl * V2 :降下電圧
FIG. 1 is a circuit diagram of an embodiment of a constant voltage circuit of the present invention, and FIG. 2 is a circuit diagram of a conventional constant voltage circuit. Vcc: Power source Ice: Current source T1. T2, T3. T++...Tan2)
Ransistor R+, R2, R3, Ru =-Ran
:Resistor VRI + VR2: Output terminal VRII, VR21: Output voltage level 11, I
2: Current Vl * V2: Voltage drop

Claims (1)

【特許請求の範囲】[Claims] エミッタを地気に接続し且つベースとコレクタを短絡し
た第一のトランジスタのコレクタを第一の抵抗器の一端
に接続し、前記第一の抵抗器の他端を第二の抵抗器を介
して第二のトランジスタのコレクタに接続し、前記第二
のトランジスタのエミッタを第三の抵抗器を介して地気
に接続し、前記第二のトランジスタのベースを前記第一
のトランジスタのコレクタに接続し、第三のトランジス
タのベース、エミッタ及びコレクタをそれぞれ前記第二
のトランジスタのコレクタ、地気及び第一の出力端子に
接続し、前記第一の出力端子と、前記第一の抵抗器と前
記第二の抵抗器との接続点との間にn個の抵抗器とn個
のダイオード接続されたトランジスタを順方向を向けて
直列に接続し、電源の一端を地気に他端を電流源を介し
て前記第一の出力端子に接続し、そして、第二の出力端
子を地気に接続したことを特徴とする定電圧回路。
The collector of a first transistor whose emitter is connected to the ground and whose base and collector are short-circuited is connected to one end of a first resistor, and the other end of the first resistor is connected through a second resistor. the emitter of the second transistor is connected to ground through a third resistor, and the base of the second transistor is connected to the collector of the first transistor. , the base, emitter, and collector of a third transistor are connected to the collector, ground, and first output terminal of the second transistor, respectively, and the first output terminal, the first resistor, and the first Connect n resistors and n diode-connected transistors in series with the forward direction between the connection point with the second resistor, and connect one end of the power supply to the ground and the other end to the current source. A constant voltage circuit, characterized in that the constant voltage circuit is connected to the first output terminal through the terminal, and the second output terminal is connected to the earth.
JP63179634A 1988-07-19 1988-07-19 Constant voltage circuit Expired - Fee Related JPH079616B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP63179634A JPH079616B2 (en) 1988-07-19 1988-07-19 Constant voltage circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP63179634A JPH079616B2 (en) 1988-07-19 1988-07-19 Constant voltage circuit

Publications (2)

Publication Number Publication Date
JPH0228812A true JPH0228812A (en) 1990-01-30
JPH079616B2 JPH079616B2 (en) 1995-02-01

Family

ID=16069195

Family Applications (1)

Application Number Title Priority Date Filing Date
JP63179634A Expired - Fee Related JPH079616B2 (en) 1988-07-19 1988-07-19 Constant voltage circuit

Country Status (1)

Country Link
JP (1) JPH079616B2 (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6269308A (en) * 1985-09-17 1987-03-30 シ−メンス、アクチエンゲゼルシヤフト Reference voltage generation circuit apparatus

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6269308A (en) * 1985-09-17 1987-03-30 シ−メンス、アクチエンゲゼルシヤフト Reference voltage generation circuit apparatus

Also Published As

Publication number Publication date
JPH079616B2 (en) 1995-02-01

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