JPH1014223A - Step-up chopper - Google Patents

Step-up chopper

Info

Publication number
JPH1014223A
JPH1014223A JP8179801A JP17980196A JPH1014223A JP H1014223 A JPH1014223 A JP H1014223A JP 8179801 A JP8179801 A JP 8179801A JP 17980196 A JP17980196 A JP 17980196A JP H1014223 A JPH1014223 A JP H1014223A
Authority
JP
Japan
Prior art keywords
transistor
choke coil
section
capacitor
control signal
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
Application number
JP8179801A
Other languages
Japanese (ja)
Other versions
JP3462348B2 (en
Inventor
Naoki Sasaki
佐々木尚樹
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SUMIDA DENKI KK
Sumida Corp
Original Assignee
SUMIDA DENKI KK
Sumida Electric Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by SUMIDA DENKI KK, Sumida Electric Co Ltd filed Critical SUMIDA DENKI KK
Priority to JP17980196A priority Critical patent/JP3462348B2/en
Publication of JPH1014223A publication Critical patent/JPH1014223A/en
Application granted granted Critical
Publication of JP3462348B2 publication Critical patent/JP3462348B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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  • Dc-Dc Converters (AREA)
  • Electronic Switches (AREA)

Abstract

PROBLEM TO BE SOLVED: To quicken the switching operation of each transistor at the step-down section and the step-up section by feeding a part of the output signal from a choke coil back to each transistor at the step-down section and the step-up section through a feedback circuit, formed by connecting a capacitor in series with a feedback winding coupled with the choke coil. SOLUTION: First and second transistors 2, 5 are applied, to the bases thereof, with a high-frequency control signal from a control circuit 10 and an electromotive force is induced across a choke coil 4 at a same frequency as the control signal. The electromotive force is induced in a feedback winding 11, coupled electromagnetically with the choke coil 4, and a capacitor 12 repeats charge/ discharge with the oscillation period of the control signal. Since a feedback circuit 13 is connected in parallel with the bases of the first and second transistors 2, 5, i.e., the control section thereof, terminal voltage of the feedback circuit 13 is superposed on the voltage of the control signal at the control section. Consequently, the voltage waveform becomes steep and the rising/falling time is shortened.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する利用分野】本発明は各種の電子機器の電
源装置に用いられる昇降圧型チョッパに関するものであ
る。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a step-up / step-down chopper used for a power supply of various electronic devices.

【0002】[0002]

【従来の技術】近年、電子機器の多様化、IC(半導体
集積回路)等の半導体装置の多様化に伴って直流電源の
電源電圧と異なる直流出力電圧を得なければならないこ
とがあり、このような場合、DC−DCコンバータが用
いられている。上記DC−DCコンバータにおいて、直
流電源電圧より低い直流出力電圧を得る場合は降圧型チ
ョッパが用いられ、逆に直流電源電圧より高い直流出力
電圧を得る場合は昇圧型チョッパが用いられており、ま
た、直流電源電圧がある範囲で変化し、直流出力電圧が
前記電源電圧の変化の範囲内の一定値に設定される場合
には前記降圧型チョッパと昇圧型チョッパの機能を兼ね
備えた昇降圧型チョッパが用いられている。
2. Description of the Related Art In recent years, with the diversification of electronic devices and the diversification of semiconductor devices such as ICs (semiconductor integrated circuits), it has sometimes been necessary to obtain a DC output voltage different from the power supply voltage of a DC power supply. In such a case, a DC-DC converter is used. In the DC-DC converter, a step-down chopper is used to obtain a DC output voltage lower than the DC power supply voltage, and a step-up chopper is used to obtain a DC output voltage higher than the DC power supply voltage. When the DC power supply voltage changes within a certain range, and the DC output voltage is set to a constant value within the range of the change in the power supply voltage, the step-up / step-down chopper having the functions of the step-down chopper and the step-up chopper is used. Used.

【0003】[0003]

【発明が解決しようとする課題】昇降圧型チョッパにお
いて、チョークコイルを小型化し、また、出力電圧のリ
ップルを小さくする方法として降圧部および昇圧部の各
トランジスタのスイッチング動作を速くすることが考え
られており、その一例としては図2のようなものがあ
る。図2において、22は第1のトランジスタでその入
力側には直流電源21が接続され、また、出力側には一
端を接地したダイオード23と他端を第2のトランジス
タ25の入力側に接続したチョークコイル24が接続さ
れており、前記トランジスタ22,ダイオード23,チ
ョークコイル24は降圧部26を構成している。また、
前記チョークコイル24と、第2のトランジスタ25と
第2のトランジスタ25の出力側に直列に接続したダイ
オード27とコンデンサ28とで昇圧部29を構成して
いる。31,32は第1のトランジスタ22と第2のト
ランジスタ25のスイッチング動作を制御するための制
御回路、30は前記制御回路31,32の動作速度を高
速度にするためのプリドライブ回路である。このよう
に、従来の昇降圧型チョッパにおいて、降圧部と昇圧部
の各トランジスタを高速度でスイッチング動作させる場
合には、プリドライブ回路を設ける必要があった。ま
た、一般に、DC−DCコンバータ等に用いられる半導
体集積回路の中にはプリドライブ回路を内蔵したものも
あるが昇降圧型チョッパを構成するのには不適当であ
る。その理由は半導体集積回路に内蔵されたプリドライ
ブ回路は機能が限定されているため、該半導体集積回路
の用途も限定されるからである。このため、昇降圧型チ
ョッパにはプリドライブ回路のない半導体集積回路を使
用するのが一般的であり、従って、降圧部と昇圧部の各
トランジスタのプリドライブ回路を外付け部品で形成し
なければならないから回路構成が複雑になり、また、コ
ストが高くなる欠点がある。
In a step-up / step-down chopper, as a method of reducing the size of the choke coil and reducing the ripple of the output voltage, it has been considered to speed up the switching operation of each transistor of the step-down unit and the step-up unit. One example is shown in FIG. In FIG. 2, reference numeral 22 denotes a first transistor, a DC power supply 21 is connected to the input side of the transistor, and a diode 23 having one end grounded to the output side and the other end connected to the input side of the second transistor 25. A choke coil 24 is connected, and the transistor 22, the diode 23, and the choke coil 24 constitute a step-down unit 26. Also,
The choke coil 24, the second transistor 25, and a diode 27 and a capacitor 28 connected in series to the output side of the second transistor 25 constitute a booster 29. 31 and 32 are control circuits for controlling the switching operation of the first transistor 22 and the second transistor 25, and 30 is a pre-drive circuit for increasing the operation speed of the control circuits 31 and 32. As described above, in the conventional step-up / step-down chopper, when the transistors of the step-down unit and the step-up unit are switched at a high speed, it is necessary to provide a pre-drive circuit. In general, some semiconductor integrated circuits used in DC-DC converters and the like include a built-in pre-drive circuit, but are not suitable for forming a step-up / step-down chopper. The reason is that the functions of the pre-drive circuit built in the semiconductor integrated circuit are limited, so that the use of the semiconductor integrated circuit is also limited. For this reason, a semiconductor integrated circuit without a pre-drive circuit is generally used for the step-up / step-down chopper. Therefore, the pre-drive circuits of the transistors in the step-down unit and the step-up unit must be formed by external components. This has the disadvantage that the circuit configuration becomes complicated and the cost increases.

【0004】[0004]

【課題を解決するための手段】本発明は、上記従来の欠
点を除去するため、上記チョークコイルに帰還巻線を結
合させ、該帰還巻線と直列にコンデンサを接続して帰還
回路を形成し、この帰還回路を介してチョークコイルの
出力信号の一部を降圧部と昇圧部の各トランジスタの制
御部に帰還させたものである。
According to the present invention, a feedback circuit is formed by connecting a feedback winding to the choke coil and connecting a capacitor in series with the feedback winding in order to eliminate the above-mentioned conventional disadvantages. A part of the output signal of the choke coil is fed back to the control section of each transistor of the step-down section and the step-up section via this feedback circuit.

【0005】[0005]

【実施例】以下、本発明の実施例について説明する。図
1において、1は直流電源、2はエミッタを入力側と
し、コレクタを出力側とする第1のトランジスタでその
入力側には直流電源1が接続され、また、出力側には一
端を接地したダイオード3とチョークコイル4の一端が
接続されており、チョークコイル4の他端はエミッタを
接地した第2のトランジスタ5のコレクタとダイオード
7の一端と接続されている。ダイオード7の他端は一方
を接地したコンデンサ8と接続されている。10は第1
のトランジスタ2と第2のトランジスタ5のスイッチン
グ動作を制御するための制御回路で各トランジスタのベ
ースに接続されている。13はチョークコイル4と電磁
的に結合させた帰還巻線11と、前記帰還巻線と直列に
接続したコンデンサ12で形成した帰還回路で該帰還回
路13の各端子はそれぞれ第1のトランジスタ2と第2
のトランジスタ5の各ベースに接続されている。ここ
で、第1のトランジスタ2とダイオード3,チョークコ
イル4は降圧部6を構成しており、また、前記チョーク
コイル4と第2のトランジスタ5,ダイオード7,コン
デンサ8は昇圧部9を構成している。
Embodiments of the present invention will be described below. In FIG. 1, 1 is a DC power supply, 2 is a first transistor having an emitter as an input side and a collector as an output side, and a DC power supply 1 is connected to the input side and one end is grounded to the output side. One end of the choke coil 4 is connected to the diode 3, and the other end of the choke coil 4 is connected to the collector of the second transistor 5 whose emitter is grounded and one end of the diode 7. The other end of the diode 7 is connected to a capacitor 8 having one grounded. 10 is the first
A control circuit for controlling the switching operation of the transistor 2 and the second transistor 5 is connected to the base of each transistor. Reference numeral 13 denotes a feedback circuit formed by a feedback winding 11 electromagnetically coupled to the choke coil 4 and a capacitor 12 connected in series with the feedback winding. Each terminal of the feedback circuit 13 is connected to the first transistor 2 respectively. Second
Are connected to the respective bases of the transistors 5. Here, the first transistor 2, the diode 3, and the choke coil 4 constitute a step-down unit 6, and the choke coil 4, the second transistor 5, the diode 7, and the capacitor 8 constitute a step-up unit 9. ing.

【0006】次に、上記構成の動作について説明する。
今、直流電源1により入力電圧が与えられるとその電圧
の大きさViに応じて降圧部6または昇圧部9が動作
し、コンデンサ8の両端に発生する出力電圧Voを予め
設定した基準電圧Vsに近づけるように作用する。ここ
で、第1のトランジスタ2および第2のトランジスタ5
の各ベースには制御回路10により高周波の制御信号が
与えられ、チョークコイル4の両端には前記制御信号と
等しい周波数の起電力が発生する。チョークコイル4に
発生した起電力は該チョークコイルと電磁結合した帰還
巻線11に誘起され、コンデンサ12は制御信号の発振
周期にしたがって充放電を繰り返す。帰還回路13の両
端はそれぞれ第1のトランジスタ2および第2のトラン
ジスタ5のベース、即ち、これらのトランジスタの制御
部に接続されているから各トランジスタ2,5の制御部
には制御信号の電圧に帰還回路13の端子電圧が加算さ
れた電圧が加わる形となるからその電圧波形は急峻とな
り、従って、その立ち上がりまたは立ち下がり時間が速
くなる。なお、トランジスタ2,5の立ち上がりまたは
立ち下がりの方向はコンデンサ12の充電極性に従って
いる。
Next, the operation of the above configuration will be described.
Now, when an input voltage is supplied from the DC power supply 1, the step-down unit 6 or the step-up unit 9 operates according to the magnitude Vi of the voltage, and the output voltage Vo generated at both ends of the capacitor 8 is changed to the preset reference voltage Vs. It works to get closer. Here, the first transistor 2 and the second transistor 5
A high-frequency control signal is supplied to each base by the control circuit 10, and an electromotive force having the same frequency as the control signal is generated at both ends of the choke coil 4. The electromotive force generated in the choke coil 4 is induced in the feedback winding 11 electromagnetically coupled to the choke coil, and the capacitor 12 repeats charging and discharging in accordance with the oscillation cycle of the control signal. Both ends of the feedback circuit 13 are respectively connected to the bases of the first transistor 2 and the second transistor 5, that is, the control units of these transistors. Since the voltage to which the terminal voltage of the feedback circuit 13 is added is added, the voltage waveform becomes steep, so that the rise or fall time is shortened. Note that the rising or falling direction of the transistors 2 and 5 depends on the charge polarity of the capacitor 12.

【0007】[0007]

【効果】本発明は、以上に述べたように、上記チョーク
コイルに帰還巻線を結合させ、該帰還巻線と直列にコン
デンサを接続して帰還回路を形成し、この帰還回路を介
してチョークコイルの出力信号の一部を降圧部と昇圧部
の各トランジスタの制御部に帰還させ、制御信号の電圧
に前記帰還回路の端子電圧が加算されるようにしたの
で、各トランジスタの制御部に加わる電圧波形を急峻に
でき、従って、各トランジスタの立ち上がりまたは立ち
下がりの速度を速くすることができ、これによってスイ
ッチング動作時の損失を減らすことができる。また、特
別なドライブ回路を用いる必要がないから回路構成が簡
単になり、コストを低減できる利点がある。
As described above, according to the present invention, a feedback winding is coupled to the choke coil, a capacitor is connected in series with the feedback winding to form a feedback circuit, and the choke is connected via the feedback circuit. A part of the output signal of the coil is fed back to the control unit of each transistor of the step-down unit and the step-up unit, and the terminal voltage of the feedback circuit is added to the voltage of the control signal. The voltage waveform can be made steep, so that the speed of the rise or fall of each transistor can be increased, thereby reducing the loss during the switching operation. In addition, since there is no need to use a special drive circuit, there is an advantage that the circuit configuration is simplified and the cost can be reduced.

【図面の簡単な説明】[Brief description of the drawings]

図1は本発明昇降圧型チョッパの実施例回路図、図2は
従来の昇降圧型チョッパの1例を示す回路図である。
FIG. 1 is a circuit diagram of an embodiment of a buck-boost chopper according to the present invention, and FIG. 2 is a circuit diagram showing an example of a conventional buck-boost chopper.

【符号の説明】[Explanation of symbols]

1・・・直流電源、2・・・第1のトランジスタ、3,
7・・・ダイオード、4・・・チョークコイル、5・・
・第2のトランジスタ、6・・・降圧部、8,12・・
・コンデンサ、9・・・昇圧部、10・・・制御回路、
11・・・帰還巻線、13・・・帰還回路
1 DC power supply 2 first transistor 3
7 ... Diode, 4 ... Choke coil, 5 ...
..The second transistor, 6,... The step-down unit, 8, 12,.
・ Capacitor, 9 ・ ・ ・ Step-up unit, 10 ・ ・ ・ Control circuit,
11 ... feedback winding, 13 ... feedback circuit

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】入力側に直流電源を接続した第1のトラン
ジスタと、前記第1のトランジスタの出力側と接地間に
接続したダイオードと、一端を前記第1のトランジスタ
の出力側に接続し、他端を第2のトランジスタの入力側
と接続したチョークコイルとで形成した降圧部と、前記
チョークコイルと、第2のトランジスタと、該第2のト
ランジスタの出力側と接地間に直列に接続したダイオー
ドとコンデンサとで形成した昇圧部とで構成され、前記
第1のトランジスタと第2のトランジスタは制御部の制
御信号によって動作制御されるようにした昇降圧型チョ
ッパにおいて、チョークコイルに帰還巻線を結合させる
とともに該帰還巻線と直列にコンデンサを接続して帰還
回路を形成し、前記帰還回路を介して第1のトランジス
タと第2のトランジスタの制御部にチョークコイルの出
力信号の一部を帰還させたことを特徴とする昇降圧型チ
ョッパ。
1. A first transistor having a DC power supply connected to an input side, a diode connected between an output side of the first transistor and ground, and one end connected to an output side of the first transistor, A step-down unit formed by a choke coil having the other end connected to the input side of the second transistor, the choke coil, the second transistor, and a series connection between the output side of the second transistor and ground; A step-up / step-down chopper, which is configured by a booster formed by a diode and a capacitor, wherein the first transistor and the second transistor are controlled in operation by a control signal of a controller; The first transistor and the second transistor are coupled together and a capacitor is connected in series with the feedback winding to form a feedback circuit. Buck-boost chopper, characterized in that is fed back a portion of the output signal of the choke coil to the control unit of the register.
JP17980196A 1996-06-21 1996-06-21 Buck-boost chopper Expired - Fee Related JP3462348B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP17980196A JP3462348B2 (en) 1996-06-21 1996-06-21 Buck-boost chopper

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP17980196A JP3462348B2 (en) 1996-06-21 1996-06-21 Buck-boost chopper

Publications (2)

Publication Number Publication Date
JPH1014223A true JPH1014223A (en) 1998-01-16
JP3462348B2 JP3462348B2 (en) 2003-11-05

Family

ID=16072141

Family Applications (1)

Application Number Title Priority Date Filing Date
JP17980196A Expired - Fee Related JP3462348B2 (en) 1996-06-21 1996-06-21 Buck-boost chopper

Country Status (1)

Country Link
JP (1) JP3462348B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015019554A (en) * 2013-07-12 2015-01-29 株式会社デンソー Drive circuit for switching element
CN109327140A (en) * 2018-11-13 2019-02-12 广州金升阳科技有限公司 A kind of step-up/step-down circuit

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015019554A (en) * 2013-07-12 2015-01-29 株式会社デンソー Drive circuit for switching element
CN109327140A (en) * 2018-11-13 2019-02-12 广州金升阳科技有限公司 A kind of step-up/step-down circuit
CN109327140B (en) * 2018-11-13 2024-02-13 广州金升阳科技有限公司 Step-up-down circuit

Also Published As

Publication number Publication date
JP3462348B2 (en) 2003-11-05

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