JPH03127926U - - Google Patents
Info
- Publication number
- JPH03127926U JPH03127926U JP3673990U JP3673990U JPH03127926U JP H03127926 U JPH03127926 U JP H03127926U JP 3673990 U JP3673990 U JP 3673990U JP 3673990 U JP3673990 U JP 3673990U JP H03127926 U JPH03127926 U JP H03127926U
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- transistor
- amplifier
- current
- base
- 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
Links
- 238000010586 diagram Methods 0.000 description 4
Landscapes
- Continuous-Control Power Sources That Use Transistors (AREA)
Description
第１図はこの考案の実施例を示す回路構成図、
第２図はバイアス抵抗による負帰還動作説明用の
要部回路図、第３図は応用実施例を示す回路構成
図、第４図は従来装置の回路構成図である。
図中、１は交流電源、２は整流装置、３は基準
電圧源、４は誤差増幅器、５，６，７，８はトラ
ンジスタ、９，１０は増幅器、１３は負荷、Ｅ１
，Ｅ２はしきい値電圧、ＶＳは基準電圧、Ｒ１は
基準抵抗である。
FIG. 1 is a circuit diagram showing an embodiment of this invention.
FIG. 2 is a main circuit diagram for explaining the negative feedback operation using a bias resistor, FIG. 3 is a circuit configuration diagram showing an applied example, and FIG. 4 is a circuit diagram of a conventional device. In the figure, 1 is an AC power supply, 2 is a rectifier, 3 is a reference voltage source, 4 is an error amplifier, 5, 6, 7, 8 are transistors, 9, 10 are amplifiers, 13 is a load, E 1
, E 2 is a threshold voltage, VS is a reference voltage, and R 1 is a reference resistance.
Claims (1)
から一定電圧を形成して負荷側へ出力するトラン
ジスタと、基準電圧を含み上記トランジスタの出
力電圧を該基準電圧と比較して一定となるように
同トランジスタの電圧形成動作を制御する誤差増
幅器とを備えた定電圧送出手段を有し、 かつ、上記トランジスタから電圧出力路を介し
て負荷側に流れる電流を電圧に変換する基準抵抗
と、該基準抵抗に発生する上記変換電圧を所定の
しきい値電圧と比較し該しきい値を超えたとき出
力を発する増幅器と、同増幅器の出力にてオンに
駆動され上記誤差増幅器から上記トランジスタに
加わるベース電流を分流させることにより上記ト
ランジスタの流出電流増加を抑止する制御用トラ
ンジスタとを備えた電流制御手段を有する定電圧
装置の電流リミタ回路において、 上記制御用トランジスタは、そのベースが上記
比較用増幅器の出力側に接続され、そのコレクタ
とエミツタは上記誤差増幅器の出力側から上記ト
ランジスタのベースに至るバイアス路と同トラン
ジスタの電圧出力側へそれぞれ接続されるととも
に、上記制御用トランジスタのベースとそのコレ
クタ間には同トランジスタと上記比較用増幅器を
含むループ回路のゲインを所望値に低減させる負
帰還用のバイアス抵抗が接続されていることを特
徴とする定電圧装置の電流リミタ回路。[Claims for Utility Model Registration] A transistor that forms a constant voltage from a DC power supply voltage obtained by rectifying an AC power supply voltage and outputs it to the load side, and a reference voltage, and a comparison of the output voltage of the transistor with the reference voltage. and an error amplifier that controls the voltage forming operation of the transistor so that the voltage is constant, and converts the current flowing from the transistor to the load side via the voltage output path into a voltage. a reference resistor, an amplifier that compares the converted voltage generated at the reference resistor with a predetermined threshold voltage and outputs an output when the threshold voltage is exceeded; In a current limiter circuit of a voltage regulator, the current limiter circuit includes a current control means including a control transistor that suppresses an increase in the outflow current of the transistor by diverting a base current applied to the transistor from an amplifier, the control transistor comprising: The base is connected to the output side of the comparison amplifier, and its collector and emitter are connected to the bias path from the output side of the error amplifier to the base of the transistor and the voltage output side of the transistor, respectively. A current limiter for a constant voltage device, characterized in that a negative feedback bias resistor is connected between the base of the transistor and its collector to reduce the gain of a loop circuit including the transistor and the comparison amplifier to a desired value. circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3673990U JPH0751623Y2 (en) | 1990-04-05 | 1990-04-05 | Current limiter circuit of constant voltage device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3673990U JPH0751623Y2 (en) | 1990-04-05 | 1990-04-05 | Current limiter circuit of constant voltage device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03127926U true JPH03127926U (en) | 1991-12-24 |
| JPH0751623Y2 JPH0751623Y2 (en) | 1995-11-22 |
Family
ID=31543236
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3673990U Expired - Fee Related JPH0751623Y2 (en) | 1990-04-05 | 1990-04-05 | Current limiter circuit of constant voltage device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0751623Y2 (en) |
-
1990
- 1990-04-05 JP JP3673990U patent/JPH0751623Y2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0751623Y2 (en) | 1995-11-22 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |