JPH03127925U - - Google Patents
Info
- Publication number
- JPH03127925U JPH03127925U JP3673890U JP3673890U JPH03127925U JP H03127925 U JPH03127925 U JP H03127925U JP 3673890 U JP3673890 U JP 3673890U JP 3673890 U JP3673890 U JP 3673890U JP H03127925 U JPH03127925 U JP H03127925U
- Authority
- JP
- Japan
- Prior art keywords
- transistor
- voltage
- current
- output
- resistor
- 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 3
Landscapes
- Continuous-Control Power Sources That Use Transistors (AREA)
Description
第１図はこの考案に係る定電圧装置の実施例を
示す回路図、第２図は電流リミタ回路１４の変形
実施例を示す抵抗切換接続図、第３図は従来装置
の一般例を示す回路図である。
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は出力トランジ
スタ、７，８，１２，１３はトランジスタ、Ｒ１
，Ｒ２，Ｒ３，Ｒ３ａ，Ｒｂ３，Ｒ３ｃは抵抗、
１１は負荷、ＶＰは直流電源電圧、ＶＳは基準電
圧、ＶＯは出力電圧、Ｉ１，Ｉ１′，Ｉ２，Ｉ２
′は出力電流である。
Fig. 1 is a circuit diagram showing an embodiment of a constant voltage device according to this invention, Fig. 2 is a resistance switching connection diagram showing a modified embodiment of the current limiter circuit 14, and Fig. 3 is a circuit showing a general example of a conventional device. It is a diagram. 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 and 6 are output transistors, 7, 8, 12, and 13 are transistors, and R 1
, R 2 , R 3 , R 3 a, Rb 3 , R 3 c are resistances,
11 is the load, VP is the DC power supply voltage, VS is the reference voltage, VO is the output voltage, I 1 , I 1 ', I 2 , I 2
' is the output current.
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、同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所定レベルに制限する電流
リミタ回路とを備え、 該電流リミタ回路は、上記トランジスタの送出
電流を電圧に変換する第１の抵抗と、該抵抗に発
生する電圧をバイアス電圧となすとともに、上記
トランジスタの許容出力電流を超えない所定の電
流にて発生するバイアス電圧によりオンとなる第
１のトランジスタとからなり、該第１のトランジ
スタのオン動作により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バイパスさせて
同トランジスタの電流増加を抑止する出力トラン
ジスタ保護用の電流リミタ回路とを有している定
電圧装置において、 上記トランジスタから負荷側に至る電圧出力路
には、同トランジスタの送出電流を電圧に変換す
る第２の抵抗と、該抵抗に発生する電圧をバイア
ス電圧となすとともに、上記負荷側における許容
流入電流を超えない所定の電流にて発生するバイ
アス電圧によりオンとなる第２のトランジスタと
を有し、該第２のトランジスタのオン動作により
上記誤差増幅器から上記トランジスタに加わるベ
ース電流をバイパスさせて同トランジスタの電流
増加を抑止する負荷保護用の電流リミタ回路とが
設けられていることを特徴とする定電圧装置。[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 a current limiter circuit that limits the current flowing from the transistor to the load side via the voltage output path to a predetermined level. The circuit includes a first resistor that converts the output current of the transistor into a voltage, a voltage generated in the resistor as a bias voltage, and a bias voltage generated at a predetermined current that does not exceed the allowable output current of the transistor. A current limiter for protecting an output transistor, comprising a first transistor that is turned on by the on operation of the first transistor, and bypasses the base current applied to the transistor from the error amplifier by turning on the first transistor, thereby suppressing an increase in the current of the transistor. In a voltage regulator having a circuit, the voltage output path from the transistor to the load side includes a second resistor that converts the output current of the transistor into a voltage, and a bias voltage that converts the voltage generated in the resistor. and a second transistor that is turned on by a bias voltage generated at a predetermined current that does not exceed the allowable inflow current on the load side, and the turn-on operation of the second transistor causes the error amplifier to A constant voltage device characterized by being provided with a current limiter circuit for load protection that bypasses the base current applied to the transistor and suppresses an increase in the current of the transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3673890U JPH0749542Y2 (en) | 1990-04-05 | 1990-04-05 | Constant voltage device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3673890U JPH0749542Y2 (en) | 1990-04-05 | 1990-04-05 | Constant voltage device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03127925U true JPH03127925U (en) | 1991-12-24 |
| JPH0749542Y2 JPH0749542Y2 (en) | 1995-11-13 |
Family
ID=31543234
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3673890U Expired - Fee Related JPH0749542Y2 (en) | 1990-04-05 | 1990-04-05 | Constant voltage device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0749542Y2 (en) |
-
1990
- 1990-04-05 JP JP3673890U patent/JPH0749542Y2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0749542Y2 (en) | 1995-11-13 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |