JPH0433117U - - Google Patents
Info
- Publication number
- JPH0433117U JPH0433117U JP7195490U JP7195490U JPH0433117U JP H0433117 U JPH0433117 U JP H0433117U JP 7195490 U JP7195490 U JP 7195490U JP 7195490 U JP7195490 U JP 7195490U JP H0433117 U JPH0433117 U JP H0433117U
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- current
- transistor
- positive
- power supply
- 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
- 238000001514 detection method Methods 0.000 claims description 2
- 230000000903 blocking effect Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 3
Landscapes
- Continuous-Control Power Sources That Use Transistors (AREA)
Description
第１図及び第２図はこの考案の実施例に係り、
第１図はその要部構成を示す回路図、第２図Ａ及
び第２図Ｂは電流制限動作説明用のレベル図、第
３図は先行技術の装置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、５，６，１６，１７は
トランジスタ、９は負荷、１４，１５は増幅器、
１８，１９は定電圧ダイオード、２０は電流制限
回路、＋Ｅ，−Ｅはしきい値電圧、Ｉ，Ｉ′は負
荷電流、Ｒｏは電流検出用抵抗、Ｖｓは基準電圧
、Ｖｚは負荷９の両端間に発生する一定電圧、Ｖ
ｒｏ，Ｖｒｏ′は変換電圧、Ｖｏ，Ｖｏ′は比較
出力電圧である。
Figures 1 and 2 relate to an embodiment of this invention,
FIG. 1 is a circuit diagram showing the configuration of its main parts, FIGS. 2A and 2B are level diagrams for explaining current limiting operation, and FIG. 3 is a circuit diagram showing an example of a prior art 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, 16, 17 are transistors, 9 is a load, 14, 15 are amplifiers,
18 and 19 are constant voltage diodes, 20 is a current limiting circuit, +E and -E are threshold voltages, I and I' are load currents, Ro is a current detection resistor, Vs is a reference voltage, and Vz is a load 9, the constant voltage V
ro and V ro ' are converted voltages, and V o and V o ' are comparison output voltages.
Claims (1)
から正極性もしくは負極性の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バイア
ス電流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電流検出
用抵抗と、接地に対して同抵抗に発生する正もし
くは負の上記変換電圧を上記負荷側の許容最大電
流から換算した正もしくは負のしきい値電圧と比
較し該しきい値電圧を超えたとき出力を発する２
つの増幅器と、同増幅器の出力にてそれぞれオン
に駆動され、上記誤差増幅器と上記トランジスタ
間のバイアス電流路を接地側へ閉成してそのバイ
ア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阻止する２つの電流制限用ト
ランジスタとを備えた定電圧装置の電流制限回路
において、 上記負のしきい値電圧を有する一方の増幅器と
同増幅器の負の電源電圧間、及び上記正のしきい
値電圧を有する他方の増幅器と同増幅器の正の電
源電圧間には各々所定の電圧降下を発生させる定
電圧ダイオードが設けられていることを特徴とす
る定電圧装置の電流制限回路。[Claims for Utility Model Registration] A transistor that forms a constant voltage of positive or negative polarity from a DC power supply voltage obtained by rectifying an AC power supply voltage and outputs it to the load side, and the output voltage of the transistor including a reference voltage. and an error amplifier for controlling the bias current of the transistor so that it is constant by comparing it with the reference voltage, and the voltage flows from the transistor to the load side via the voltage output path. Compare the current detection resistor that converts current to voltage and the positive or negative converted voltage generated in the same resistor with respect to ground with the positive or negative threshold voltage calculated from the maximum allowable current on the load side. Outputs when the threshold voltage is exceeded 2
The bias current path between the error amplifier and the transistor is closed to the ground side, and the bias current is shunted to reduce the increase in the outflow current of the transistor. In the current limiting circuit of the voltage regulator, which includes two current limiting transistors for blocking, between one of the amplifiers having the above negative threshold voltage and the negative power supply voltage of the same amplifier, and between the above positive threshold voltage. 1. A current limiting circuit for a constant voltage device, characterized in that a constant voltage diode is provided between the other amplifier having a voltage and the positive power supply voltage of the same amplifier, each of which generates a predetermined voltage drop.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7195490U JP2538565Y2 (en) | 1990-07-06 | 1990-07-06 | Current limiting circuit of constant voltage device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7195490U JP2538565Y2 (en) | 1990-07-06 | 1990-07-06 | Current limiting circuit of constant voltage device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0433117U true JPH0433117U (en) | 1992-03-18 |
| JP2538565Y2 JP2538565Y2 (en) | 1997-06-18 |
Family
ID=31609452
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7195490U Expired - Fee Related JP2538565Y2 (en) | 1990-07-06 | 1990-07-06 | Current limiting circuit of constant voltage device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2538565Y2 (en) |
-
1990
- 1990-07-06 JP JP7195490U patent/JP2538565Y2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP2538565Y2 (en) | 1997-06-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5285367A (en) | Linear load circuit to control switching power supplies under minimum load conditions | |
| US9974129B1 (en) | Circuit and method for LED current regulation and ripple control | |
| US20210018944A1 (en) | Output current limiter for a linear regulator | |
| JP2006502690A (en) | Method and apparatus for driving a power MOSFET as a synchronous rectifier circuit | |
| US4075546A (en) | Regulated power supply with combined series and shunt regulating transistors | |
| JPH0433117U (en) | ||
| JPH07177737A (en) | Stabilized dc power equipment | |
| JPH0420116U (en) | ||
| JPH03127925U (en) | ||
| JPH03127926U (en) | ||
| JP2584337Y2 (en) | Switching power supply | |
| JPS6367433B2 (en) | ||
| JPS6393791U (en) | ||
| JPS633540B2 (en) | ||
| JPS6374100U (en) | ||
| JPH0315260Y2 (en) | ||
| JPS642543Y2 (en) | ||
| JPS5840648Y2 (en) | compression amplifier | |
| JPS61164516U (en) | ||
| JPH0832166B2 (en) | Overcurrent detection circuit | |
| JPH0648977Y2 (en) | Bias power supply circuit for static induction transistor | |
| KR880002752Y1 (en) | Low voltage amplifier | |
| KR950005262Y1 (en) | Current control circuit | |
| JP3237288B2 (en) | Full-wave rectifier circuit | |
| JP2512713Y2 (en) | Switching power supply |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| LAPS | Cancellation because of no payment of annual fees |