JPS6229995B2 - - Google Patents
Info
- Publication number
- JPS6229995B2 JPS6229995B2 JP14652981A JP14652981A JPS6229995B2 JP S6229995 B2 JPS6229995 B2 JP S6229995B2 JP 14652981 A JP14652981 A JP 14652981A JP 14652981 A JP14652981 A JP 14652981A JP S6229995 B2 JPS6229995 B2 JP S6229995B2
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- current
- transistor
- capacitor
- shows
- 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.)
- Expired
Links
- 239000003990 capacitor Substances 0.000 claims description 9
- 230000002159 abnormal effect Effects 0.000 description 4
- 230000010355 oscillation Effects 0.000 description 4
- 230000000087 stabilizing effect Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of DC power input into DC power output
- H02M3/22—Conversion of DC power input into DC power output with intermediate conversion into AC
- H02M3/24—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters
- H02M3/28—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC
- H02M3/325—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Description
【発明の詳細な説明】
本発明はスイツチング電源のソフトスタート回
路に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a soft start circuit for a switching power supply.
第１図は従来の回路を示すもので、図におい
て、１は直流電源、２は変圧器、３はスイツチン
グ用トランジスタ、４はダイオード、５はコンデ
ンサ、６は負荷を示す。８はトランジスタ３の駆
動回路を示す。 FIG. 1 shows a conventional circuit. In the figure, 1 is a DC power supply, 2 is a transformer, 3 is a switching transistor, 4 is a diode, 5 is a capacitor, and 6 is a load. Reference numeral 8 indicates a drive circuit for the transistor 3.
この回路は、シングルエンデツド・フライバツ
ク方式・コンバータ回路であるが、トランジスタ
３がオフしているときに、オン時に蓄えられたエ
ネルギーを２次側に供給するように動作する回路
である。この回路においてトランジスタ３がオン
状態となり、電源が投入された場合、電源投入時
より定常状態に至るまでの△Ｔ時間の間、最悪の
場合は、第２図に示すように出力電流I0は定常状
態のそれより高くなることが考えられ、非常に危
険である。この場合２次電流（出力電流）I0はト
ランスの巻線比、インダクタ又はトランジスタＱ
のｈFE，ベース電流等によつて変化する。従つて
電源投入時の△Ｔ期間にベース電流が定まらない
状態では第２図に示すような現象も考えられるの
である。本発明は上記の欠点を改善し、電源投入
時における異常発振、異常電流を避けるために発
振をソフトスタートする回路をもうけ、発振の安
定化を図ることを目的とするものである。 This circuit is a single-ended flyback type converter circuit, and when the transistor 3 is off, it is a circuit that operates to supply the energy stored when it is on to the secondary side. In this circuit, when the transistor 3 is turned on and the power is turned on, during the △T time from when the power is turned on until the steady state is reached, in the worst case, the output current I 0 is It is possible that the value will be higher than that in the steady state, which is extremely dangerous. In this case, the secondary current (output current) I 0 is the turns ratio of the transformer, the inductor or transistor Q
It changes depending on h FE , base current, etc. Therefore, if the base current is not determined during the ΔT period when the power is turned on, the phenomenon shown in FIG. 2 may occur. It is an object of the present invention to improve the above-mentioned drawbacks and provide a circuit for soft-starting oscillation in order to avoid abnormal oscillation and abnormal current when the power is turned on, thereby stabilizing oscillation.
次に本発明の実施例を図面について説明する。 Next, embodiments of the present invention will be described with reference to the drawings.
第３図は本発明の回路を示すもので、この回路
は第１図の場合と同様のシングルエンデツト・フ
ライバツク方式のコンバータ回路である。この回
路の特徴とする点は、トランジスタ３のベースと
エミツタ（大地）間に抵抗Ｒ及びコンデンサＣの
直列回路よりなるソフトスタート回路７を附加し
た点にある。 FIG. 3 shows a circuit according to the present invention, which is a single-ended flyback type converter circuit similar to that shown in FIG. A feature of this circuit is that a soft start circuit 7 consisting of a series circuit of a resistor R and a capacitor C is added between the base and emitter (ground) of the transistor 3.
次に本発明の回路の動作について説明する。 Next, the operation of the circuit of the present invention will be explained.
ソフトスタート回路のコンデンサＣの動作状態
を第４図に示す。すなわちトランジスタの駆動回
路８よりの電源投入時（ｔ＝０）においてコンデ
ンサＣは短絡状態となり電流はソフトスタート回
路にバイパスされ、抵抗Ｒをとおしてグランドに
流れる。時間がたつにつれてコンデンサＣに徐々
に充電され、△Ｔ時間後に充電が完了すると、こ
の回路に電流は流れなくなり定常状態に移るので
ある。第５図は負荷に流れる電流I0を示す。 FIG. 4 shows the operating state of capacitor C in the soft start circuit. That is, when power is turned on from the transistor drive circuit 8 (t=0), the capacitor C is short-circuited, and the current is bypassed to the soft start circuit and flows to ground through the resistor R. As time passes, capacitor C is gradually charged, and when charging is completed after time ΔT, no current flows in this circuit and the circuit enters a steady state. FIG. 5 shows the current I 0 flowing through the load.
本発明は叙上のように、トランジスタのベース
と大地との間にコンデンサＣと抵抗Ｒで構成され
たソフトスタート回路を挿入することにより△Ｔ
期間の状態を決定し、ベース電流を徐々に増加す
ることにより、出力電流も増加させることができ
るのであり、電源投入時における異常発振、異常
電流をさけることができる。 As mentioned above, the present invention achieves △T by inserting a soft start circuit consisting of a capacitor C and a resistor R between the base of the transistor and the ground.
By determining the period state and gradually increasing the base current, the output current can also be increased, and abnormal oscillation and abnormal current when the power is turned on can be avoided.
第１図は従来の回路、第２図は従来回路の負荷
電流、第３図は本発明のソフトスタート回路、第
４図はコンデンサの端子電圧、第５図は本発明回
路による負荷電流を示す。
１…直流電源、２…変圧器、３…トランジス
タ、４…ダイオード、５…コンデンサ、６…負
荷、７…ソフトスタート回路、８…トランジスタ
駆動回路。
Figure 1 shows the conventional circuit, Figure 2 shows the load current of the conventional circuit, Figure 3 shows the soft start circuit of the present invention, Figure 4 shows the terminal voltage of the capacitor, and Figure 5 shows the load current of the circuit of the present invention. . 1... DC power supply, 2... Transformer, 3... Transistor, 4... Diode, 5... Capacitor, 6... Load, 7... Soft start circuit, 8... Transistor drive circuit.
Claims (1)
タを介して電源に接続し、前記の変圧器の２次側
に整流回路を介して負荷に接続した回路におい
て、前記のスイツチングトランジスタのベースと
大地間に抵抗及びコンデンサの直列回路を接続し
てなるスイツチング電源のソフトスタート回路。1 In a circuit where the primary side of the transformer is connected to a power source via a switching transistor, and the secondary side of the transformer is connected to a load via a rectifier circuit, the connection between the base of the switching transistor and the ground A soft-start circuit for a switching power supply that connects a series circuit of a resistor and a capacitor to the .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14652981A JPS5849083A (en) | 1981-09-17 | 1981-09-17 | Soft starting circuit for switching power source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14652981A JPS5849083A (en) | 1981-09-17 | 1981-09-17 | Soft starting circuit for switching power source |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5849083A JPS5849083A (en) | 1983-03-23 |
| JPS6229995B2 true JPS6229995B2 (en) | 1987-06-30 |
Family
ID=15409699
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14652981A Granted JPS5849083A (en) | 1981-09-17 | 1981-09-17 | Soft starting circuit for switching power source |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5849083A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63189995U (en) * | 1987-05-29 | 1988-12-07 |
-
1981
- 1981-09-17 JP JP14652981A patent/JPS5849083A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63189995U (en) * | 1987-05-29 | 1988-12-07 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5849083A (en) | 1983-03-23 |
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