JPS5910947Y2 - power supply - Google Patents
power supplyInfo
- Publication number
- JPS5910947Y2 JPS5910947Y2 JP16298382U JP16298382U JPS5910947Y2 JP S5910947 Y2 JPS5910947 Y2 JP S5910947Y2 JP 16298382 U JP16298382 U JP 16298382U JP 16298382 U JP16298382 U JP 16298382U JP S5910947 Y2 JPS5910947 Y2 JP S5910947Y2
- Authority
- JP
- Japan
- Prior art keywords
- main switch
- transformer
- switch element
- power supply
- current
- 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
Landscapes
- Dc-Dc Converters (AREA)
Description
【考案の詳細な説明】
考案の技術分野
本考案は、人出力が直流的に絶縁された小形，軽量で経
済的なＤＣ−ＤＣコンバータより或る電源装置に関する
ものである。DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention relates to a power supply device using a small, lightweight, and economical DC-DC converter in which the human output is galvanically isolated.
従来技術と問題点
従来の入出力絶縁形のＤＣ−ＤＣコンバータの１例を第
１図に示す。Prior Art and Problems An example of a conventional input/output isolated type DC-DC converter is shown in FIG.
同図において、電源１の直流電圧ＶＩＮをスイッチング
トランジスタより或る主スイッチ（Ｓ．）３で矩形波交
流に変換し、トランス２の１次側巻線Ｎ０に加え、２次
側巻線Ｎ２から整流用ダイオード７，還流用ダイオード
８と、直列インダクタンス９と並列キャパシタンス１０
より戊る低域通過フィルタを通して所定の直流出力電圧
■。In the figure, the DC voltage VIN of the power supply 1 is converted to a square wave AC by a main switch (S.) 3 using a switching transistor, and is applied to the primary winding N0 of the transformer 2 and from the secondary winding N2. Rectifier diode 7, freewheeling diode 8, series inductance 9, and parallel capacitance 10
■Predetermined DC output voltage through a low-pass filter.
が取出される。is taken out.
更にこの出力電圧Ｖ。を検出増幅回路１１により検出増
幅した後、ホトカプラ又はパルストランス等より或る絶
縁結合部１２を介して制御回路４に入力し、発振回路６
からの駆動信号を制御して主スイッチ（Ｓ．）３の断続
比を可変にして出力電圧Ｖ。Furthermore, this output voltage V. After being detected and amplified by the detection amplification circuit 11, it is inputted to the control circuit 4 via a certain insulating coupling part 12 from a photocoupler or pulse transformer, and then the oscillation circuit 6
By controlling the drive signal from the main switch (S.) 3, the switching ratio of the main switch (S.) 3 is made variable to obtain the output voltage V.
の安定制御を行なう帰還回路が設けられる。A feedback circuit is provided to perform stability control.
又主スイッチ（Ｓ．）３を流れる電流を電流トランス５
で検出し、電流がある値以上になると制御回路４を制御
し主スイッチ（Ｓ．）３を強制的に遮断する信号を出す
過電流保護回路が設けられる。In addition, the current flowing through the main switch (S.) 3 is transferred to a current transformer 5.
An overcurrent protection circuit is provided which detects the current and outputs a signal that controls the control circuit 4 and forcibly shuts off the main switch (S.) 3 when the current exceeds a certain value.
第２図ａ−ｃはこの過電流保護回路の動作波形図を示す
。FIGS. 2a-2c show operating waveform diagrams of this overcurrent protection circuit.
同図ａの過電流検出信号が同図ｂの主スイッチ（Ｓ．）
３の駆動信号に対応して検出された時、主スイッチ電流
は同図Ｃに示すように、主スイツ（Ｓ．）３固有の蓄積
時間ｔ５のために主スイッチ電流は流れ続け、トランス
２が飽和に近づいて主スイッチ（Ｓ．）３には同図に示
す過電流検出時の電流■１よりも大きな電流Ｉ２が流れ
てしまう。The overcurrent detection signal in figure a is connected to the main switch (S. in figure b).
When the main switch current is detected in response to the drive signal S.3, the main switch current continues to flow due to the accumulation time t5 inherent in the main switch (S.)3, as shown in FIG. As the main switch (S.) approaches saturation, a current I2 larger than the current 1 at the time of overcurrent detection shown in the figure flows through the main switch (S.) 3.
過電流に対する保護を確実に行なうためには、蓄積時間
ｔ５を見込んで過電流検出点を設定する必要が生じるが
、蓄積時間ｔ５はスイッチ素子によりばらつきが大きく
、初期にその値を見込むと主スイッチ（Ｓ．）３の最大
許容電流に対して余裕をとった小さな値にしなければな
らず無駄が大きい。In order to reliably protect against overcurrent, it is necessary to set the overcurrent detection point in consideration of the accumulation time t5, but since the accumulation time t5 varies widely depending on the switch element, if the value is estimated initially, it is necessary to set the overcurrent detection point. (S.) It is necessary to set a small value with a margin for the maximum allowable current of 3, which is a big waste.
又トランスも蓄積時間ｔ５による主スイッチ導通時間の
増加に対して飽和しないような大きな容量を必要とする
ため大形化し価格的にも不経済である。Furthermore, the transformer also requires a large capacity that does not saturate as the main switch conduction time increases due to the accumulation time t5, making it large and uneconomical in terms of price.
考案の目的
本考案の目的は、入出力が直流的に絶縁された小形，軽
量で経済的なＤＣ−ＤＣコンバータより或る電源装置を
提供することである。Purpose of the Invention An object of the present invention is to provide a power supply device using a small, lightweight, and economical DC-DC converter whose input and output are galvanically isolated.
以下本考案を実施例につき詳述する。The present invention will be described in detail below with reference to examples.
考案の実施例
第３図は本考案の実施例の構威を示す説明図であり、第
４図ａ−ｅはその動作波形図を示す。Embodiment of the Invention FIG. 3 is an explanatory diagram showing the structure of an embodiment of the invention, and FIGS. 4 a to 4 e show its operational waveform diagrams.
第３図において、電源１の直流電圧ＶＩＮを第１の主ス
イッチ（Ｓ．）３を介しトランス２の１次側巻線Ｎ１に
加え、主スイッチ（Ｓ１）３が発振回路６からの一定周
期駆動信号により断続動作を行なう。In FIG. 3, the DC voltage VIN of the power supply 1 is applied to the primary winding N1 of the transformer 2 through the first main switch (S.) 3, and the main switch (S1) 3 receives a constant periodic signal from the oscillation circuit 6. Intermittent operation is performed by the drive signal.
トランス２の２次側巻線Ｎ２からの矩形波交流を直列の
スイッチングトランジスタより戒る第２の主スイッチ（
Ｓ２）２１を通して整流した後、直列インダクタンス９
と並列キャパシタンク１０より或る低域通過を通して所
定の直流出力電圧■。A second main switch (
S2) After rectifying through 21, the series inductance 9
and a predetermined DC output voltage ■ through a certain low pass from the capacitor tank 10 in parallel.
が取出される。is taken out.
なお、ダイオード８は直列インダクタンス９の電流を連
続して流すための還流用ダイオードである。Note that the diode 8 is a freewheeling diode that allows the current of the series inductance 9 to flow continuously.
更にこの出力電圧■。を検出増幅回路１１により検出増
幅し、制御回路２２により主スイッチ（ Ｓ ２） ２
１の断続比を可変として出力電圧■。Furthermore, this output voltage ■. is detected and amplified by the detection amplification circuit 11, and the main switch (S2) 2 is detected by the control circuit 22.
Output voltage ■ with variable intermittent ratio of 1.
の安定制御を行なう。performs stability control.
前述のように、主スイッチ（Ｓ２）２１は整流用ダイオ
ードの役目を兼用しており 主スイッチ（Ｓ２）２１は
制御回路２２から制御され、制御回路２２は、検出増幅
回路１１，同期検出回路２３，電流トランス２４からの
信号に応じて、主スイッチ（Ｓ２）２１の駆動信号を出
力するものである。As mentioned above, the main switch (S2) 21 also serves as a rectifying diode, and the main switch (S2) 21 is controlled by the control circuit 22, which is connected to the detection amplifier circuit 11 and the synchronization detection circuit 23. , and outputs a drive signal for the main switch (S2) 21 in response to signals from the current transformer 24.
この場合、第１の主スイッチ（Ｓｌ）３と第２の主スイ
ッチ（Ｓ２）２１との同期がとられ、かつ主スイッチ（
Ｓ２）２１の最大導通時間が主スイッチ（Ｓｔ）３の最
大導通時間より小さくなるように制御回路２２が構戊さ
れているものである。In this case, the first main switch (Sl) 3 and the second main switch (S2) 21 are synchronized, and the main switch (
The control circuit 22 is configured such that the maximum conduction time of S2) 21 is smaller than the maximum conduction time of the main switch (St) 3.
又主スイッチ（Ｓ２）２１を流れる電流が過電流となっ
た場合には電流トランス（ＣＴ）２４で検出し、制御回
路２２により主スイッチ（Ｓ２）２１を強制的に遮断す
る。Further, when the current flowing through the main switch (S2) 21 becomes an overcurrent, it is detected by the current transformer (CT) 24, and the main switch (S2) 21 is forcibly cut off by the control circuit 22.
第４図ａ−ｅは第３図の実施例における要部の波形図を
示す。4a to 4e show waveform diagrams of essential parts in the embodiment of FIG. 3.
同図ａの発振回路６の出力信号に対応して同図ｂに示す
駆動信号により１次側の主スイッチ（Ｓ．）３が駆動時
間ｔ１で断続され、又同図ｄに示す２次側の主スイッチ
（Ｓ２）２１が駆動時間ｔ２で断続されるものであり、
これは、補助巻線Ｎ３を介して同期検出回路２３が主ス
イッチ（Ｓ．）３の電流の立上りを検出し、その検出信
号により制御回路２２は同図ｄに示す主スイッチ（Ｓ２
）２１の駆動信号を出力する。The main switch (S.) 3 on the primary side is turned on and off for a drive time t1 by the drive signal shown in b in the figure corresponding to the output signal of the oscillation circuit 6 in a in the figure, and the secondary side shown in d in the figure The main switch (S2) 21 is turned on and off during the drive time t2,
This is because the synchronization detection circuit 23 detects the rise of the current of the main switch (S.) 3 via the auxiliary winding N3, and the control circuit 22 uses the detection signal to control the main switch (S.
)21 drive signals are output.
又制御回路２２はｔ１〉ｔ２となるように駆動信号を出
力するものである。Further, the control circuit 22 outputs a drive signal so that t1>t2.
従って第１と第２の主スイッチ駆動信号の立上りは同期
化され、第２の主スイッチ駆動信号の立下り後に第１の
主スイッチ駆動信号が立下る。Therefore, the rises of the first and second main switch drive signals are synchronized, and the first main switch drive signal falls after the fall of the second main switch drive signal.
主スイッチ（Ｓ２）２１により主スイッチＳ２電流は固
有の蓄積時間ｔ′８だけｔ２時間の主スイッチ駆動信号
より遅れて立下り、同図Ｃの主スイッチＳ１電流も同じ
立下りを示した後、ｔ１時間の終りまで無負荷電流ｉｏ
が流れる。The main switch (S2) 21 causes the main switch S2 current to fall by a specific accumulation time t'8 with a delay from the main switch drive signal at time t2, and after the main switch S1 current in FIG. No-load current io until the end of time t1
flows.
このようにすれば、主スイッチ（Ｓ２）２１が必ず主ス
イッチ（Ｓ．）３より先に遮断し、ここで電流トランス
（ＣＴ）２４に過電流が検出されても時間ｔ′８が時間
ｔ１−ｔ２を超すことはないから主スイッチ（Ｓ．）３
の電流が過電流となることはなくなる。In this way, the main switch (S2) 21 is always cut off before the main switch (S.) 3, and even if an overcurrent is detected in the current transformer (CT) 24, the time t'8 is changed to the time t1. - Since it does not exceed t2, the main switch (S.) 3
The current will no longer become an overcurrent.
考案の効果 ・
以上説明したように、本考案によれば、トランス２の１
次側に一定の矩形波交流で断続する第１のスイッチ素子
即ち主スイッチ（Ｓ．）３を設け、２次側に整流用の断
続制御可能な第２のスイッチ素子即ち、主スイッチ（Ｓ
２）２１を設け、第１と第２のスイッチ素子の導通開始
を同期化させて直流出力電圧の安定制御を行なうもので
、トランス２に補助巻線Ｎ３を設けても、そのトランス
２が特に大形化することはなく、又第１のスイッチ素子
の最大導通時間より第２のスイッチ素子の最大導通時間
を短く設定したことにより、スイッチング損失を少くし
、１次側の第１のスイッチング素子を流れる過電流を有
効に制限することができるものであるから、トランス２
等の小形化を図ることができる利点がある。Effects of the invention - As explained above, according to the invention, transformer 2, 1
A first switching element, that is, a main switch (S.) 3, which is intermittent with a constant rectangular wave alternating current, is provided on the secondary side, and a second switching element, that is, a main switch (S.
2) 21 is provided to synchronize the start of conduction of the first and second switching elements to perform stable control of the DC output voltage.Even if the transformer 2 is provided with the auxiliary winding N3, the transformer 2 It does not increase in size, and by setting the maximum conduction time of the second switch element shorter than the maximum conduction time of the first switch element, switching loss is reduced, and the first switching element on the primary side The transformer 2 can effectively limit the overcurrent flowing through the transformer 2.
It has the advantage of being able to be made smaller.
第１図は従来例の構威を示す説明図、第２図は第１図の
要部の動作波形図、第３図は本考案の構或を示す説明図
、第４図は第３図の要部の動作説明図であり、図中、１
は直流電源、２はトランス、Ｎ１は１次側巻線、Ｎ２は
２次側巻線、Ｎ３は補助巻線、３は主スイッチＳ１、６
は発振回路、８は整流用ダイオード、９はインダクタン
ス、１０はキャパシタンス、１１は検出増幅回路、２１
は主スイッチＳ２、２２は制御回路、２３は同期検出回
路、２４は電流トランスを示す。Fig. 1 is an explanatory diagram showing the structure of the conventional example, Fig. 2 is an operational waveform diagram of the main part of Fig. 1, Fig. 3 is an explanatory diagram showing the structure of the present invention, and Fig. 4 is Fig. 3. It is an explanatory diagram of the operation of the main part of , and in the figure, 1
is the DC power supply, 2 is the transformer, N1 is the primary winding, N2 is the secondary winding, N3 is the auxiliary winding, 3 is the main switch S1, 6
is an oscillation circuit, 8 is a rectifying diode, 9 is an inductance, 10 is a capacitance, 11 is a detection amplifier circuit, 21
2 is a main switch S2, 22 is a control circuit, 23 is a synchronization detection circuit, and 24 is a current transformer.
Claims (1)
の１次側巻線に印加し、該トランスの２次側巻線に誘起
する電圧を整流して直流出力電圧とするＤＣ−ＤＣコン
バータより戊る電源装置において、前記トランスの２次
側巻線に整流用の断続制御可能な第２のスイッチ素子を
接続し、前記トランスに補助巻線を設け、該補助巻線に
接続され前記第１のスイッチ素子に流れる電流の立上り
を検出する同期検出回路と、該同期検出回路の検出信号
により、前記第１のスイッチ素子の導通開始に同期し、
且つ該第１のスイッチ素子の最大導通時間より前記第２
のスイッチ素子の最大導通時間が短くなるように該第２
のスイッチ素子の断続動作を制御する制御回路とを設け
たことを特徴とする電源装置。From a DC-DC converter that connects and disconnects a DC voltage using a first switch element and applies it to the primary winding of a transformer, and rectifies the voltage induced in the secondary winding of the transformer to obtain a DC output voltage. In the power supply device, a second switch element for rectification that can be controlled on and off is connected to the secondary winding of the transformer, an auxiliary winding is provided in the transformer, and the first switch element connected to the auxiliary winding is connected to the secondary winding of the transformer. a synchronization detection circuit that detects a rise in the current flowing through the switch element; and a detection signal from the synchronization detection circuit to synchronize with the start of conduction of the first switch element;
and from the maximum conduction time of the first switch element, the second
the second switch element so that the maximum conduction time of the switch element becomes short.
1. A power supply device comprising: a control circuit for controlling intermittent operation of a switching element.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16298382U JPS5910947Y2 (en) | 1982-10-27 | 1982-10-27 | power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16298382U JPS5910947Y2 (en) | 1982-10-27 | 1982-10-27 | power supply |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58108781U JPS58108781U (en) | 1983-07-25 |
| JPS5910947Y2 true JPS5910947Y2 (en) | 1984-04-04 |
Family
ID=30102009
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16298382U Expired JPS5910947Y2 (en) | 1982-10-27 | 1982-10-27 | power supply |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5910947Y2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4803822B2 (en) * | 2007-03-23 | 2011-10-26 | Ｔｄｋラムダ株式会社 | Multi-output power supply |
-
1982
- 1982-10-27 JP JP16298382U patent/JPS5910947Y2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58108781U (en) | 1983-07-25 |
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