JPS6096178A - Dc/dc converter - Google Patents
Dc/dc converterInfo
- Publication number
- JPS6096178A JPS6096178A JP20146683A JP20146683A JPS6096178A JP S6096178 A JPS6096178 A JP S6096178A JP 20146683 A JP20146683 A JP 20146683A JP 20146683 A JP20146683 A JP 20146683A JP S6096178 A JPS6096178 A JP S6096178A
- Authority
- JP
- Japan
- Prior art keywords
- transistor
- transformer
- voltage
- converter
- turned
- 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
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
- H02M3/33538—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 of the forward type
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
Description
【発明の詳細な説明】
（２０発明の技術分野
本発明は低入力電圧でデボに動作する１）Ｃ−ＤＣコン
バータの）１゛に成に関する。DETAILED DESCRIPTION OF THE INVENTION (20) Technical Field of the Invention The present invention relates to a component (1) of a C-DC converter that operates devo- tionally at a low input voltage.
（１））従来技術と問題点
りに１図は一方式１）Ｃ−Ｌ）Ｃコンバータの従来回路
ｔ−示すものである。すなわちスイッチ素子として電界
効果トランジスタｃ以下区Ｇしてトランジスタ）Ｑ、が
用いられ砒圧変換用変圧器（以下略してトランス）Ｔ１
の１次側を通じて直流電源ｖｌに接続されている。(1)) Prior Art and Problems Figure 1 shows a conventional circuit of a one-sided (1) C-L)C converter. In other words, a field effect transistor (C, G, transistor) Q is used as a switching element, and a voltage converting transformer (hereinafter abbreviated as a transformer) T1 is used.
is connected to the DC power supply vl through the primary side of the
またトランジスタＱＩのゲート・ソース間に制御用トラ
ンジスタＱ２が設けられている。またトランスＴ、の２
次側にはダイオードＤｌｌＤ２とインダクタンスＬとコ
ンデンサＣとからなる平滑回路があり、負荷１に直流出
力が供給されている。Further, a control transistor Q2 is provided between the gate and source of the transistor QI. Also, transformer T, No. 2
On the next side, there is a smoothing circuit consisting of a diode DllD2, an inductance L, and a capacitor C, and a DC output is supplied to the load 1.
か＼るＤＣ−ＤＣコンバータの動作としてはトランジス
タＱｌのゲートとソース間に入力直流電源Ｖ、の電圧全
起動抵抗Ｒ，，Ｒ，で分割しＩｔ圧を加えてトランジス
タＱ＋ｉターンオンさせる条件を与える一方、ターンオ
フ期間は制御回路２よりトランジスタＱ２のベースにオ
ン信号を与えて動作させトランジスタＱ１のゲートとソ
ース間を短絡してターンオフさせている。すなわち制御
回路２よりトランジスタＱ、にオン信号を与えるとトラ
ンジスタＱ＋はオフまたトランジスタＱ２にオフ信号を
与えるときはトランジスタＱ＋はオンとなり、制御回路
２のオンφオフ信号により交流電圧を発生させトランス
Ｔ、で変圧し整流回路で整流して直流出力を負荷１に供
給していた。The operation of such a DC-DC converter is to divide the voltage of the input DC power supply V between the gate and source of the transistor Ql by the total starting resistance R,,R, and apply It pressure to provide conditions for turning on the transistor Q+i. During the turn-off period, the control circuit 2 applies an on signal to the base of the transistor Q2 to operate it, and short-circuits the gate and source of the transistor Q1 to turn it off. That is, when the control circuit 2 gives an on signal to the transistor Q, the transistor Q+ turns off, and when an off signal is given to the transistor Q2, the transistor Q+ turns on. , and then rectified it in a rectifier circuit to supply DC output to load 1.
然し乍らこの方式では直流電源Ｖの電′圧が低い場合は
トランジスタＱ１への入ノＪ１圧がターンオン電圧より
高くとれずトランジスタＱ＋に動作できないと云う欠点
がある。However, this method has the disadvantage that when the voltage of the DC power supply V is low, the voltage J1 applied to the transistor Q1 cannot be higher than the turn-on voltage, and the transistor Q+ cannot operate.
（Ｃ１発明の目的
本発明の目的は低入力電圧においても容易に且つ安定に
動作するＤＣ−ＤＣコンバータの回路構成を提供するに
ある。(C1 Object of the Invention The object of the invention is to provide a circuit configuration of a DC-DC converter that operates easily and stably even at low input voltages.
（ｄｌ 発明の構成
本発明の目的は入力直流電源とトランスとに直列に接続
したスイッチ素子をオン・オフして交流を発生し、該父
１は１圧変換して軒が［し出力電源とずｂｖｃ−Ｄｃコ
ンバータＶこおいて、前記スイッチ素子のオフ期間にオ
ン期間とは逆方向にトランスを励磁し′Ｃおき、該励磁
全土める際に生ずる逆起電力と直流電源り圧との和によ
り前記スイッチ素子をターンオンすることを特徴とする
ＤＣ−ＤＣコ／バータにより達成することができる。(dl Structure of the Invention The object of the present invention is to turn on and off a switching element connected in series to an input DC power source and a transformer to generate alternating current, convert the voltage to one voltage, In the bvc-dc converter V, the transformer is excited in the opposite direction to the on-period during the off-period of the switching element, and the back electromotive force generated during the entire excitation and the DC power supply voltage are This can be achieved by a DC-DC co/verter characterized in that the switch element is turned on by the sum of the sum.
本発明はトランジスタＱ１のオフ時にトランス’Ｌｋオ
ンの時とは逆極性に励磁させその逆起電力を利用して低
入力電圧で起動させるようにするものである。In the present invention, when the transistor Q1 is turned off, the transistor Q1 is excited with a polarity opposite to that when the transformer 'Lk is turned on, and the back electromotive force is used to start the transistor with a low input voltage.
第２図は本発明に係るコンバータの実施例であって従来
回路と異るところはトランジスタＱ、のゲ−） ＩＣ）
ランス１゛２の１次側巻線Ｎ、と抵抗Ｒ３，ダイオード
Ｄ３の回路で電圧印加を行うようにした点が具っている
。すなわち制御回路２よりのオン信号により制御トラン
ジスタＱ２がオンとなっているとｂはトランジスタＱ＋
（Ｉまオフ、また制御トランジスタＱ２がオフの時はト
ランジスタＱ、はオンとなりトラフ２１，０１次側の巻
ｋ Ｎ＋を通ってトランジスタＱ１にＬｆｌＣ？庇かり
Ｉしれる。Figure 2 shows an embodiment of the converter according to the present invention, and the difference from the conventional circuit is that the transistor Q
The main feature is that voltage is applied through a circuit consisting of the primary winding N of the lance 1-2, the resistor R3, and the diode D3. That is, when the control transistor Q2 is turned on by the on signal from the control circuit 2, b becomes the transistor Q+.
(I is off, and when the control transistor Q2 is off, the transistor Q is on, and LflC? is applied to the transistor Q1 through the trough 21, 0, the primary winding kN+).
第２図のトランスＴ２の巻線Ｎ、 −Ｎ３に付しである
ドツトはこの時励磁される極性を示している。The dots attached to the windings N and -N3 of the transformer T2 in FIG. 2 indicate the polarity with which they are excited at this time.
次に制御回路２よりのオン信号によりトランジスタＱ２
がオンすると、電流は巻線Ｎ３−抵抗Ｒ，−ダイオード
Ｄｊ−トランジスタＱ＋の経路で流れる結果としてトラ
ンスＴ、ヲ逆極性に励磁する。Next, the transistor Q2 is turned on by the ON signal from the control circuit 2.
When turned on, current flows through the path of winding N3, resistor R, diode Dj, and transistor Q+, and as a result, the transformer T is excited to the opposite polarity.
次にこの状態でトランジスタＱ２がオフとなるとトラン
スＴ２に逆起電力が発生し、その結果トランジスタＱ＋
のゲートとソース間には入力電圧とトランスの２次巻線
Ｎ３に発生する電圧の和が加わりトランジスタＱ１がタ
ーンオンする。すなわち直流電源電圧がトランジスタＱ
、のゲート・ソース間ターンオン電圧以下であっても容
易に起動することになる。なお制御回路２からのオン・
オフ信号は実際には負荷１と接続するフィードバック回
路を設はパルス幅制御機構（略称ＰＷＭ）により一週期
を構成するオン・オフ比を調節して行われており、これ
によね出力重圧の調整を行うことができる。Next, when transistor Q2 is turned off in this state, a back electromotive force is generated in transformer T2, and as a result, transistor Q+
The sum of the input voltage and the voltage generated in the secondary winding N3 of the transformer is applied between the gate and source of the transistor Q1, turning on the transistor Q1. In other words, the DC power supply voltage is
Even if the voltage is lower than the gate-source turn-on voltage of , it is easy to start up. Note that the ON/OFF signal from control circuit 2
The off signal is actually generated by setting up a feedback circuit connected to load 1 and adjusting the on/off ratio that makes up one week period using a pulse width control mechanism (abbreviated as PWM), which also adjusts the output pressure. It can be performed.
以上のように本発明に係るＤＣコンバータを使用する場
合は入力電源電圧が低くても安定に動作すると共にトラ
ンジスタＱ１のオフ時にトランスＴ、を逆方向に励磁す
るため磁束変化（ΔＢ）が犬巻くとれ、そのためトラン
スＴｔの使用効率が上り、小形化が可能となる。As described above, when using the DC converter according to the present invention, it operates stably even when the input power supply voltage is low, and since the transformer T is excited in the opposite direction when the transistor Q1 is off, the magnetic flux change (ΔB) is slightly curved. Therefore, the efficiency of use of the transformer Tt increases and miniaturization becomes possible.
（ｆ） 発明の効果
本発明は第１図に挙げたようなりＣ−ＤＣコンバータの
従来回路ではＦＥＴへの入力電圧がゲート會ンース間の
ターンオン電圧よりも低い場合には動作しないと云う欠
点を改めるもので、本発明の実施により低入力電圧でも
安定動作が可能となる。(f) Effects of the Invention The present invention overcomes the drawback that the conventional circuit of the C-DC converter does not operate when the input voltage to the FET is lower than the turn-on voltage between the gate and gate terminals, as shown in FIG. By implementing the present invention, stable operation is possible even at low input voltage.
第１図は従来のＤＣ−ＤＣコンバータの回路図、また第
２図は本発明に係るＤＣ−ＬＤＣコンバータの回路図で
ある。
図において１は負荷、２は制御回路。FIG. 1 is a circuit diagram of a conventional DC-DC converter, and FIG. 2 is a circuit diagram of a DC-LDC converter according to the present invention. In the figure, 1 is the load and 2 is the control circuit.
Claims (1)
子全オン・万７して父０１シを発生し、該交流を電圧変
換し′Ｃ整流し出力車線とするＤＣ−ＤＣコンバータ！
ｔＣオイて、前記スイッチ素子のオフ期間にオン期間と
は逆方向にトランスを励磁して２呻 き、該励磁を止め
る除に生ずる逆起゛諷カと直流電源電圧との和により前
記スイッチ調子ケタ−／オンすることを特徴とするＤＣ
−ＤＣ’ＩＣコンバA DC-DC converter that generates a voltage when all switch elements connected in series with the input DC source and the transformer are turned on, converts the AC into a voltage, rectifies it, and outputs it!
tC, during the off period of the switch element, the transformer is excited in the opposite direction to the on period, and the switch is adjusted by the sum of the back electromotive force generated when the excitation is stopped and the DC power supply voltage. DC characterized by digit/on
-DC'IC converter
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20146683A JPS6096178A (en) | 1983-10-27 | 1983-10-27 | Dc/dc converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20146683A JPS6096178A (en) | 1983-10-27 | 1983-10-27 | Dc/dc converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6096178A true JPS6096178A (en) | 1985-05-29 |
Family
ID=16441550
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20146683A Pending JPS6096178A (en) | 1983-10-27 | 1983-10-27 | Dc/dc converter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6096178A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4757433A (en) * | 1987-01-07 | 1988-07-12 | Display Components, Inc. | Power supply |
-
1983
- 1983-10-27 JP JP20146683A patent/JPS6096178A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4757433A (en) * | 1987-01-07 | 1988-07-12 | Display Components, Inc. | Power supply |
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