JPS63265524A - Power supply circuit - Google Patents
Power supply circuitInfo
- Publication number
- JPS63265524A JPS63265524A JP62099529A JP9952987A JPS63265524A JP S63265524 A JPS63265524 A JP S63265524A JP 62099529 A JP62099529 A JP 62099529A JP 9952987 A JP9952987 A JP 9952987A JP S63265524 A JPS63265524 A JP S63265524A
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- switching transistor
- power supply
- supply circuit
- currents
- 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
- 238000004804 winding Methods 0.000 claims abstract description 14
- 238000001514 detection method Methods 0.000 claims description 10
- 230000002401 inhibitory effect Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 3
- 230000003321 amplification Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 1
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、トランス一次巻線電ｆｉをスイッチングトラ
ンジスタで制御する゛電源回路に関し特にスイッチング
トランジスタ電流のリミット値を一定とする電源回路に
関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a power supply circuit in which a transformer primary winding electric current fi is controlled by a switching transistor, and more particularly to a power supply circuit in which the limit value of the switching transistor current is kept constant.
スイッチングトランジスタに流れる電流のリミッ）１１
１Ｅを制限する為の従来の電源回路は、第２図にその一
例を示すような構成を有している。すなわち、スイッチ
ングトランジスタ１０成流を検出抵抗４で検出し、その
電圧Ｖｚをコンパレータ３に入力し、基準電圧Ｖｚと比
較し検出電圧Ｖｇが基準電圧Ｖｚよシ高くなった場合に
、スイッチングトランジスタ１をＯＦＦする。従って、
スイッチングトランジスタｔｍ１２のリミット値は、常
に一定の値となる様になっていた。その為、入力電圧Ｖ
ＩＮの変動する電源においては、低入力電圧時に充分定
格出力を供給出来るようスイッチングトランジスタ’ｔ
Ｋｌｌｔのピーク＋ｔｉを設定した場合に、高入力電圧
時にはスイッチングトランジスタのＶＣＥが高くなる為
にスイッチングトランジスタの安全動作領域をオーバー
する欠点を有している。Limit of current flowing through switching transistor) 11
A conventional power supply circuit for limiting 1E has a configuration as shown in FIG. 2 as an example. That is, the switching transistor 10 current is detected by the detection resistor 4, the resulting voltage Vz is input to the comparator 3, and compared with the reference voltage Vz. If the detected voltage Vg becomes higher than the reference voltage Vz, the switching transistor 1 is switched off. Turn off. Therefore,
The limit value of the switching transistor tm12 was always set to a constant value. Therefore, the input voltage V
In a power supply where IN fluctuates, a switching transistor is used to supply sufficient rated output at low input voltage.
When the peak of Kllt +ti is set, the VCE of the switching transistor becomes high when the input voltage is high, which has the disadvantage of exceeding the safe operating area of the switching transistor.
本発明が解決しようとする問題点は、上述の如き従来の
電源回路における欠点を除去することに１）、従って本
発明の目的は、上記の欠点を除去して電源の入力電圧に
よってスイッチングトランジスタ電流のリミット１直を
コントロールすることが出来る電源回路を提供すること
にるる。The problem to be solved by the present invention is to eliminate the drawbacks in the conventional power supply circuit as described above (1).Therefore, an object of the present invention is to eliminate the above-mentioned drawbacks and to control the switching transistor current according to the input voltage of the power supply. The purpose of this invention is to provide a power supply circuit that can control the limit 1 shift.
本発明のｔ源回路はトランス一次巻線電流をコントロー
ルするスイッチングトランジスタと前記スイッチングト
ランジスタ電流を検出する検出抵抗と、前記検出抵抗の
電圧と所定の基準電圧とを比較し前記トランジスタに信
号を送る比較部とを備える電源回ｗ６ｒｃおいて、前記
トランス一次側に補助巻線を設けて構成される。The t-source circuit of the present invention includes a switching transistor that controls the transformer primary winding current, a detection resistor that detects the switching transistor current, and a comparison that compares the voltage of the detection resistor with a predetermined reference voltage and sends a signal to the transistor. The power supply circuit w6rc includes an auxiliary winding on the primary side of the transformer.
次に本発明について図面を参照して説明する。 Next, the present invention will be explained with reference to the drawings.
第１図は本発明の一実施例を示す回路図でるる。FIG. 1 is a circuit diagram showing one embodiment of the present invention.
図に示すように、トランス−次巻森６の１１Ｌ流をコン
トロールするスイッチングトランジスタ１を流れる電流
１２．は検出抵抗４に人力され、また同時に検出抵抗４
にはトランス一次巻線６に対しｔ”ｊ一方向に巻かれた
補助巻Ｉｓ７からの電流１３と金入力し電圧ＶＥを生ず
る。比較回路３は電圧Ｖｒ、を入力し所定の基準電圧Ｖ
ｚと比較し、基準′磁圧Ｖｚより検出電圧ＶＥが高い場
合に出力信号１１を増幅用トランジスタ２に送りスイッ
チングトランジスタ１を０ＦＦＩ、て、スイッチングト
ランジスタ這流１１を抑える。As shown in the figure, a current 12. is manually applied to the detection resistor 4, and at the same time the detection resistor 4
Inputs the current 13 from the auxiliary winding Is7 wound in one direction to the transformer primary winding 6 and generates the voltage VE.The comparator circuit 3 inputs the voltage Vr, and sets it to a predetermined reference voltage V.
When the detected voltage VE is higher than the reference magnetic pressure Vz, the output signal 11 is sent to the amplification transistor 2 and the switching transistor 1 is set to 0FFI, thereby suppressing the switching transistor leakage 11.
上述のように構成された電ｍ回路は入力電圧ＶＩＮが変
動すると、補助！−電圧Ｖａも変動されるので抵抗５を
流れる電流１３が変動して検出電圧■を変動させる。従
って、入力磁圧ＶＩＮが高くなった場合、補助巻線電圧
■も高くなシ、それによって電流１３が増加する為に、
その分だけスイッチングトランジスタｌを流れる電流１
１は低い値でおさえられる。When the input voltage VIN fluctuates, the electric m circuit configured as described above becomes auxiliary! - Since the voltage Va is also varied, the current 13 flowing through the resistor 5 is varied, causing the detected voltage ■ to vary. Therefore, when the input magnetic pressure VIN increases, the auxiliary winding voltage ■ also increases, and as a result, the current 13 increases.
The current 1 flowing through the switching transistor l by that amount
1 can be suppressed to a low value.
以上詳細に説明したように本発明の１に源回路は電源の
入力端子に対応してスイッチングトランジスタ電流のリ
ミット値を最適な蝋にすることができるので、本発明の
電源回路を用いることによ）低入力電圧時に充分定格出
力を供給出来なおかつ高入力電圧時に充分スイッチング
トランジスタを安全動作領域内で使用することが出来る
効果がある。As explained in detail above, the first aspect of the present invention is that the power supply circuit can set the limit value of the switching transistor current to an optimum value in accordance with the input terminal of the power supply, so by using the power supply circuit of the present invention, ) The effect is that a sufficient rated output can be supplied at low input voltages, and the switching transistor can be used within the safe operating range at high input voltages.
第１図は本発明の一実施例を示す回路図、第２図は従来
の″電源回路の一例を示す回路図である。
図において、ＶＩＮ・・・・・・入力電圧、ｖＥ・・・
・・・検出電圧、Ｖｚ・・・・・・基準電圧、Ｖト・・
・・・補助巻線電圧、ｌ・・・・・・スイッチングトラ
ンジスタ、２・・・・・・増幅用トランジスタ、３・・
・・・・比較回路、４・・・・・・検出抵抗、５・・・
・・・抵抗、６・・・・・・トランス一次巻線、７・・
・・・・補助巻線、８・・・・・・定′慮圧ダイオード
。
ノｌ：沈彰１社カ府ド多
／２：協→げピ万Ｉ改近FIG. 1 is a circuit diagram showing an embodiment of the present invention, and FIG. 2 is a circuit diagram showing an example of a conventional power supply circuit. In the figure, VIN...input voltage, vE...
...Detection voltage, Vz...Reference voltage, Vt...
...Auxiliary winding voltage, l...Switching transistor, 2...Amplification transistor, 3...
... Comparison circuit, 4 ... Detection resistor, 5 ...
...Resistance, 6...Transformer primary winding, 7...
...Auxiliary winding, 8... Constant pressure diode. No. 1: Shen Chang 1 Company Kafu Dota / 2: Association → Gepi Man I Kaikin
Claims (1)
グトランジスタと、前記スイッチングトランジスタ電流
を検出する検出抵抗と、前記検出抵抗の電圧と所定の基
準電圧とを比較し前記トランジスタに信号を送る比較部
とを備える電源回路において、前記トランス一次側に設
けられ、前記電源回路への入力電圧と対応した電圧を発
生して前記検出抵抗電圧に加えて、前記スイッチングト
ランジスタ電流のリミット値を前記電源回路への入力電
圧によって変化させる為の補助巻線を備えることを特徴
とする電源回路。A power supply comprising: a switching transistor that controls a current in a transformer primary winding; a detection resistor that detects the switching transistor current; and a comparison section that compares the voltage of the detection resistor with a predetermined reference voltage and sends a signal to the transistor. In the circuit, the circuit is provided on the primary side of the transformer, generates a voltage corresponding to the input voltage to the power supply circuit, and adds it to the detection resistor voltage, and sets a limit value of the switching transistor current according to the input voltage to the power supply circuit. A power supply circuit characterized by having an auxiliary winding for changing the power.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62099529A JPS63265524A (en) | 1987-04-21 | 1987-04-21 | Power supply circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62099529A JPS63265524A (en) | 1987-04-21 | 1987-04-21 | Power supply circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63265524A true JPS63265524A (en) | 1988-11-02 |
Family
ID=14249750
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62099529A Pending JPS63265524A (en) | 1987-04-21 | 1987-04-21 | Power supply circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63265524A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5063303A (en) * | 1991-02-08 | 1991-11-05 | Racal Data Communications Inc. | Soft start circuit |
| US5757226A (en) * | 1994-01-28 | 1998-05-26 | Fujitsu Limited | Reference voltage generating circuit having step-down circuit outputting a voltage equal to a reference voltage |
-
1987
- 1987-04-21 JP JP62099529A patent/JPS63265524A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5063303A (en) * | 1991-02-08 | 1991-11-05 | Racal Data Communications Inc. | Soft start circuit |
| US5757226A (en) * | 1994-01-28 | 1998-05-26 | Fujitsu Limited | Reference voltage generating circuit having step-down circuit outputting a voltage equal to a reference voltage |
| US5986293A (en) * | 1994-01-28 | 1999-11-16 | Fujitsu Limited | Semiconductor integrated circuit device with voltage patterns |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5495164A (en) | Boost converter | |
| EP0416933B1 (en) | Driver circuit for a large capacity switching element | |
| JPS63265524A (en) | Power supply circuit | |
| JPS61244271A (en) | Switching regulator | |
| US4068158A (en) | High efficiency d.c. voltage regulator | |
| JPH02133067A (en) | Switching power supply | |
| JP3508092B2 (en) | Average value rectifier circuit and switching power supply circuit | |
| KR0134704Y1 (en) | A regulating circuit for output voltage in power supply | |
| JP2536111Y2 (en) | Switch circuit | |
| JPH02294269A (en) | Power supply device | |
| JP2773534B2 (en) | DC power supply | |
| JPH0373191B2 (en) | ||
| JPH0686454A (en) | Power device | |
| JPS6110474Y2 (en) | ||
| SU1023994A2 (en) | Threshold inverter | |
| JPS63299767A (en) | Dc-dc converter | |
| JPS6318962A (en) | Switching power source | |
| JP2572617Y2 (en) | Switching regulator | |
| JPH1052041A (en) | Power supply circuit | |
| SU1056172A1 (en) | Stabilized power source | |
| KR970010613B1 (en) | Assistant power supply circuit of a power supply device | |
| JPH0336222Y2 (en) | ||
| JPH04117166A (en) | Switching power supply | |
| JPH03183357A (en) | Chopper controller | |
| JPS6215025B2 (en) |