JPH0452914A - voltage stabilization circuit - Google Patents
voltage stabilization circuitInfo
- Publication number
- JPH0452914A JPH0452914A JP16170290A JP16170290A JPH0452914A JP H0452914 A JPH0452914 A JP H0452914A JP 16170290 A JP16170290 A JP 16170290A JP 16170290 A JP16170290 A JP 16170290A JP H0452914 A JPH0452914 A JP H0452914A
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- terminal
- resistor
- circuit
- output 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.)
- Pending
Links
- 230000006641 stabilisation Effects 0.000 title claims description 4
- 238000011105 stabilization Methods 0.000 title claims description 4
- 230000000087 stabilizing effect Effects 0.000 claims description 14
- 239000004973 liquid crystal related substance Substances 0.000 description 8
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 238000003889 chemical engineering Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
Landscapes
- Continuous-Control Power Sources That Use Transistors (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
〔産業上の利用分野１
本発明は、ＭＯＳ、構造の電圧安定化回路に関する６
［従来の技術］
従来のＭＯＳ構造の電圧安定化回路は、第２図に示す如
（、基準電圧発生回路４と、オペアンプ５と、出力電圧
端子２と基準電位となる電源端子３（以下、ＧＮＤ端子
という）の間に接続された抵抗７．８及び入力電圧端子
１と出力電圧端子２の間に接続されたＭＯＳトランジス
タ６により構成されていた。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field 1] The present invention relates to a voltage stabilizing circuit having a MOS structure.6 [Prior Art] A conventional voltage stabilizing circuit having a MOS structure is as shown in FIG. (, the reference voltage generation circuit 4, the operational amplifier 5, the resistor 7.8 connected between the output voltage terminal 2 and the power supply terminal 3 serving as the reference potential (hereinafter referred to as the GND terminal), and the input voltage terminal 1 and the output voltage It consisted of a MOS transistor 6 connected between terminals 2.
［発明が解決しようとする課題］
しかし、従来の回路構成の電圧安定化回路の出力電圧温
度特性は、基準電圧発生回路４と、抵抗７と抵抗８の比
により決まり、基準電圧は通常、仕事関数差によるＭＯ
Ｓトランジスタのしきい値電圧の差△ＶＴＨを利用する
ため、はぼ−０，６ｍＶ／”Ｃ程度で自由に制御するこ
とができず、また抵抗比の温度特性も温度に対してほと
んど依存性のない平坦な特性を示す。[Problems to be Solved by the Invention] However, the output voltage temperature characteristics of a voltage stabilizing circuit with a conventional circuit configuration are determined by the reference voltage generation circuit 4 and the ratio of the resistors 7 and 8, and the reference voltage is usually MO by function difference
Since the threshold voltage difference △VTH of the S transistor is used, the voltage cannot be freely controlled at around -0.6mV/''C, and the temperature characteristics of the resistance ratio are also almost independent of temperature. It exhibits flat characteristics with no .
従って、液晶パネル駆動用電源として使用する場合に要
求される液晶パネルの温度特性に整合した出力電圧温度
特性を実現することができないという問題点を有してい
た。Therefore, there has been a problem in that it is not possible to realize output voltage temperature characteristics that match the temperature characteristics of a liquid crystal panel required when used as a power supply for driving a liquid crystal panel.
そこで本発明はこのような問題点を解決するもので、そ
の目的とするところは、液晶パネル駆動用電源に要求さ
れる液晶パネルの温度特性に整合した出力電圧温度特性
を、使用する液晶パネルの温度特性に応して任意の温度
特性を実現することができる電圧安定化回路を提供する
ところにある。The present invention is intended to solve these problems, and its purpose is to provide an output voltage temperature characteristic that matches the temperature characteristics of the liquid crystal panel required for the power supply for driving the liquid crystal panel. The object of the present invention is to provide a voltage stabilizing circuit that can realize arbitrary temperature characteristics depending on the temperature characteristics.
［課題を解決するための手段］
本発明の電圧安定化回路は、少なくとも基準電圧発生回
路と、出力電圧端子と基＄電位となる電源端子の間に接
続されたダイオードと抵抗及びその中間点と基準電圧発
生回路の出力を人力とするオペアンプ、出力電圧端子と
出力電圧端子にソース電極・ドレイン電極が接続され、
前記オペアンプ出力がゲート電極に接続されたＭＯＳト
ランジスタにより構成することを特徴とする。[Means for Solving the Problems] The voltage stabilizing circuit of the present invention includes at least a reference voltage generation circuit, a diode and a resistor connected between an output voltage terminal and a power supply terminal having a base potential, and a midpoint thereof. An operational amplifier that uses the output of a reference voltage generation circuit as a human power source, with source and drain electrodes connected to the output voltage terminal and the output voltage terminal.
It is characterized in that the operational amplifier output is constituted by a MOS transistor connected to a gate electrode.
［作 用］
本発明の上記の構成によれば、ダイオードの温度特性を
利用して出力電圧端子２とＧＮＤ端子３の間に挿入され
る直列に接続されたダイオードの個数及びダイオードを
流れる電流を任意に設定することにより、液晶パネル駆
動用電源に要求される液晶パネルの温度特性に整合した
任意の出力電圧温度特性を実現することが可能となる。[Function] According to the above configuration of the present invention, the number of series-connected diodes inserted between the output voltage terminal 2 and the GND terminal 3 and the current flowing through the diodes can be determined by utilizing the temperature characteristics of the diodes. By setting it arbitrarily, it becomes possible to realize an arbitrary output voltage temperature characteristic that matches the temperature characteristic of the liquid crystal panel required of the power supply for driving the liquid crystal panel.
［実 施 例］
以下、本発明について実施例に基づいて詳細に説明する
。第１図は、本発明の負電位基準の電圧安定化回路の一
実施例を示す回路図である。[Examples] Hereinafter, the present invention will be described in detail based on Examples. FIG. 1 is a circuit diagram showing an embodiment of a voltage stabilizing circuit based on a negative potential according to the present invention.
ｌは入力電圧端子Ｃ以下、ＶＩＮ端子という）、２は出
力電圧端子（以下、■。ＬＩＴ端子という）、３は、Ｇ
ＮＤ端子、４は基準電圧発生回路で入力電圧に依存しな
い一定の基準電圧Ｖ３を出力する機能を有する、５はオ
ペアンプ、６はＭＯＳトランジスタ、７．８は抵抗、９
はダイオードである。l is the input voltage terminal C or below, referred to as the VIN terminal), 2 is the output voltage terminal (hereinafter referred to as ■.LIT terminal), and 3 is the G
ND terminal, 4 is a reference voltage generation circuit which has the function of outputting a constant reference voltage V3 independent of the input voltage, 5 is an operational amplifier, 6 is a MOS transistor, 7.8 is a resistor, 9
is a diode.
次に第１図の実施例における動作を説明する。Next, the operation in the embodiment shown in FIG. 1 will be explained.
第１図の実施例における電圧安定化回路の出力電圧■。Output voltage (■) of the voltage stabilizing circuit in the embodiment shown in FIG.
は、下記の式により表わされる。is expressed by the following formula.
■６ 基準電圧発生回路４で発生する基準電圧Ｒ７抵抗
７の抵抗値
Ｒ８抵抗８の抵抗値
■、 ダイオード９の１個についての電圧降下ｎ 接
続されているダイオードの個数（１）式の第１項は、抵
抗８の両端の電圧、第２項は、抵抗７の両端の電圧、第
３項は、ダイオードでの電圧降下分である。つまり、第
１図のＡ点の電位と基準電圧■８が等しくなる状態が、
第１図の電圧安定化回路の安定状態であり、■。ＵＴ端
子２とＧＮＤ端子３の間に接続されているダイオード９
、抵抗７．８を流れる電流工、は、Ｉ 、＝Ｖ１．ｌ／
Ｒ，・・・ （２）で表わされる。■6 Reference voltage generated in the reference voltage generation circuit 4 R7 Resistance value of resistor 7 R8 Resistance value of resistor 8 ■, Voltage drop for each diode 9 n Number of connected diodes The first of equation (1) The term is the voltage across the resistor 8, the second term is the voltage across the resistor 7, and the third term is the voltage drop across the diode. In other words, the state in which the potential at point A in Figure 1 and the reference voltage ■8 are equal is:
This is the stable state of the voltage stabilization circuit in Figure 1, and ■. Diode 9 connected between UT terminal 2 and GND terminal 3
, the current flowing through resistor 7.8 is I, =V1. l/
R,... (2)
次に、温度が変化して抵抗８の値かに％変化すると電流
Ｉ、は、
となる。（ｋ＝に／１．００）
ところが、抵抗７と抵抗８を同一集積回路内に同一製造
工程で作り込めば、抵抗７と抵抗８の温度特性は同一に
なり、抵抗７の値もに％変化する６
ゆえに抵抗７での電圧降下は、
となり、（１）式の第２項と同一になり、抵抗７での電
圧降下は、温度が変化しても変わらないことになる。つ
まり温度が変化しても第１図Ｂ点の電位は変化しない６
従って、出力電圧温度特性は、第３図に示す如くダイオ
ード９の温度特性による変化分△Ｖｒと、抵抗８の温度
特性による電流工、の変化に対するシフト分△■１の和
となる。抵抗８を高抵抗にして△Ｖ、を小さくすること
により、出力電圧の温度係数Ｋｔ（ｍＶ／’Ｃ）は、は
ぼ△■、の温度特性により決定される。たとえば、△Ｖ
Ｆ ＝ ２ ｍ Ｖ ／ ”Ｃでダイオード２低置
列接続すると、出力電圧の温度係数は、Ｋ ｔ ＝ −
２ｍ Ｖ ／ ”ＣＸ ２ ＝ −４ｍ Ｖ ／ ’Ｃ
となり、−４ｍ Ｖ ／ ’Ｃの出力電圧温度特性を有
する電圧安定化回路を実理することができる。Next, when the temperature changes and the value of the resistor 8 changes by %, the current I becomes: (k = /1.00) However, if resistor 7 and resistor 8 are made in the same integrated circuit in the same manufacturing process, the temperature characteristics of resistor 7 and resistor 8 will be the same, and the value of resistor 7 will also be % Therefore, the voltage drop across the resistor 7 is as follows, which is the same as the second term in equation (1), and the voltage drop across the resistor 7 does not change even if the temperature changes. In other words, even if the temperature changes, the potential at point B in Figure 1 does not change6.
Therefore, the output voltage temperature characteristic is the sum of the change ΔVr due to the temperature characteristic of the diode 9 and the shift Δ■1 due to the change in current due to the temperature characteristic of the resistor 8, as shown in FIG. By making the resistor 8 high in resistance and reducing ΔV, the temperature coefficient Kt (mV/'C) of the output voltage is determined by the temperature characteristics of ΔV. For example, △V
When two diodes are connected in series at F = 2 mV/''C, the temperature coefficient of the output voltage is Kt = -
2m V/'CX 2 = -4m V/'C
Therefore, it is possible to implement a voltage stabilization circuit having an output voltage temperature characteristic of -4 mV/'C.
従って、使用する液晶パネルの温度特性に整合するよう
にダイオードの個数を設定すれば、所望の温度特性を有
する電圧安定化回路が得られることになる。第１図の上
記実施例は、負電位基準の電圧安定化回路の場合である
が、正電位基準の電圧安定化回路の場合でも実施は可能
である。Therefore, by setting the number of diodes to match the temperature characteristics of the liquid crystal panel used, a voltage stabilizing circuit having desired temperature characteristics can be obtained. Although the embodiment shown in FIG. 1 is a voltage stabilizing circuit based on a negative potential, it can also be implemented in a voltage stabilizing circuit based on a positive potential.
［発明の効果］
以上述べたように本発明によれば、出力電圧端子と基準
電位となる電源端子の間に接続するダイオードの個数と
抵抗値を調整することにより、使用する液晶パネルの温
度特性に整合する任意の出力電圧温度特性を有する電圧
安定化回路を得ることが可能となるなどすぐれた効果を
有するものである。[Effects of the Invention] As described above, according to the present invention, the temperature characteristics of the liquid crystal panel used can be adjusted by adjusting the number and resistance value of diodes connected between the output voltage terminal and the power supply terminal serving as the reference potential. This has excellent effects such as making it possible to obtain a voltage stabilizing circuit having arbitrary output voltage temperature characteristics that match the above.
第１図は、本発明の負電位基準の電圧安定化回路の一実
施例を示す回路図。
第２図は、従来の負電位基準の電圧安定化回路の回路図
。
第３図は、ダイオード特性図。
１ ・ ・
２ ・ ・ ・
３ ・ ・
４ ・ ・
５ ・ ・ ・
６ ・ ・ ・
７ ・ ・
８ ・ ・ ・
９ ・ ・ ・
ＶＩＮ端子
Ｖ ＱＬＩ’ｒ端子
ＧＮＤ端子
基準電圧発生回路
オペアンプ
ＭＯＳトランジスタ
抵抗
抵抗
ダイオード
以上
出願人 セイコーエプソン株式会社
代理人 弁理士 鈴 木 喜三部（化１名）第１図
ΔＶ工ΔＶＦ
系 ３ 頭
第２図FIG. 1 is a circuit diagram showing an embodiment of a voltage stabilizing circuit based on a negative potential according to the present invention. FIG. 2 is a circuit diagram of a conventional negative potential reference voltage stabilizing circuit. Figure 3 is a diode characteristic diagram. 1 ・ ・ 2 ・ ・ 3 ・ ・ 4 ・ ・ 5 ・ ・ 6 ・ ・ ・ 7 ・ ・ 8 ・ ・ ・ 9 ・ ・ ・ VIN terminal V QLI'r terminal GND terminal Reference voltage generation circuit operational amplifier MOS transistor resistance Applicant for diodes and above Seiko Epson Co., Ltd. Agent Patent attorney Kizobe Suzuki (1 person in chemical engineering) Figure 1 ΔV engineering ΔVF series 3 heads Figure 2
Claims (1)
も基準電圧発生回路と、出力電圧端子と基準電位となる
電源端子の間に接続されたダイオードと、抵抗及びその
中間点と基準電圧発生回路の出力を入力とするオペアン
プ、入力電圧端子と出力電圧端子にソース電極・ドレイ
ン電極が接続され、前記オペアンプ出力がゲート電極に
接続されたＭ＠Ｏ＠Ｓトランジスタにより構成すること
を特徴とする電圧安定化回路。In a voltage stabilizing circuit with an M@O@S structure, at least a reference voltage generation circuit, a diode connected between an output voltage terminal and a power supply terminal serving as a reference potential, a resistor and its intermediate point, and a reference voltage generation circuit. Voltage stabilization, characterized in that it is constituted by an operational amplifier whose output is an input, a source electrode and a drain electrode are connected to an input voltage terminal and an output voltage terminal, and an M@O@S transistor whose operational amplifier output is connected to a gate electrode. circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16170290A JPH0452914A (en) | 1990-06-20 | 1990-06-20 | voltage stabilization circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16170290A JPH0452914A (en) | 1990-06-20 | 1990-06-20 | voltage stabilization circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0452914A true JPH0452914A (en) | 1992-02-20 |
Family
ID=15740250
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16170290A Pending JPH0452914A (en) | 1990-06-20 | 1990-06-20 | voltage stabilization circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0452914A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7456681B2 (en) | 2005-02-28 | 2008-11-25 | Elpida Memory, Inc. | Power supply voltage step-down circuit, delay circuit, and semiconductor device having the delay circuit |
| JP2011166982A (en) * | 2010-02-12 | 2011-08-25 | Nichicon Corp | Converter |
-
1990
- 1990-06-20 JP JP16170290A patent/JPH0452914A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7456681B2 (en) | 2005-02-28 | 2008-11-25 | Elpida Memory, Inc. | Power supply voltage step-down circuit, delay circuit, and semiconductor device having the delay circuit |
| JP2011166982A (en) * | 2010-02-12 | 2011-08-25 | Nichicon Corp | Converter |
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