JPH0556634A - Switching power circuit - Google Patents
Switching power circuitInfo
- Publication number
- JPH0556634A JPH0556634A JP23085391A JP23085391A JPH0556634A JP H0556634 A JPH0556634 A JP H0556634A JP 23085391 A JP23085391 A JP 23085391A JP 23085391 A JP23085391 A JP 23085391A JP H0556634 A JPH0556634 A JP H0556634A
- Authority
- JP
- Japan
- Prior art keywords
- capacitor
- diode
- terminal
- power supply
- positive
- 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
Landscapes
- Dc-Dc Converters (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明はスイッチング電源回路に
関し、昇圧正電圧出力を得ると同時にその２倍の電圧値
の正電圧出力を得る回路に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switching power supply circuit, and more particularly to a circuit for obtaining a boosted positive voltage output and at the same time obtaining a positive voltage output having a voltage value twice that of the boosted positive voltage output.
【０００２】[0002]
【従来の技術】従来この種のスイッチング電源回路は、
図２の回路のように、昇圧電源回路を二つ用いていた。
ここで２１は正入力電源端子、２２は負入力電源端子、
２３は第１コイル、２４は第２コイル、２５は第１制御
回路、２６は第２制御回路、２７は第１ダイオード、２
８は第２ダイオード、２９は第１のＮＰＮトランジス
タ、３０は第２のＮＰＮトランジスタ、３１は第１コン
デンサ、３２は第２コンデンサ、３３は第１の正出力端
子、３４は第２の正出力端子、３５は出力グランド端子
である。2. Description of the Related Art Conventional switching power supply circuits of this type are
Two boosting power supply circuits were used as in the circuit of FIG.
Here, 21 is a positive input power supply terminal, 22 is a negative input power supply terminal,
23 is a first coil, 24 is a second coil, 25 is a first control circuit, 26 is a second control circuit, 27 is a first diode, 2
8 is a second diode, 29 is a first NPN transistor, 30 is a second NPN transistor, 31 is a first capacitor, 32 is a second capacitor, 33 is a first positive output terminal, and 34 is a second positive output. The terminal 35 is an output ground terminal.
【０００３】[0003]
【発明が解決しようとする課題】上記した従来のスイッ
チング電源回路は、スイッチング電源回路を二つ用いて
いたため、回路が複雑かつ、高価になるという欠点があ
る。The conventional switching power supply circuit described above uses two switching power supply circuits, and therefore has the drawback that the circuit is complicated and expensive.
【０００４】本発明はスイッチング電源のトランジスタ
・スイッチの動作を利用してチャージポンプ回路を付加
することにより簡易に本来の出力電圧とその２倍の電圧
を同時に得るスイッチング電源回路を提供することにあ
る。An object of the present invention is to provide a switching power supply circuit which can easily obtain an original output voltage and a voltage twice as high as the original output voltage by adding a charge pump circuit by utilizing the operation of a transistor switch of the switching power supply. ..
【０００５】[0005]
【課題を解決するための手段】本発明のスイッチング電
源回路は、正入力電源端子と負入力電源端子と第１の正
出力端子と第２の正出力端子と出力グランド端子と制御
回路とコイルとＮＰＮトランジスタと第１のダイオード
と第２のダイオードと第３のダイオードと第１のコンデ
ンサと第２のコンデンサと第３のコンデンサを具備し、
前記正入力電源端子とコイルの片端と前記制御回路の正
電源端子を接続し、前記コイルの他端と前記ＮＰＮトラ
ンジスタのコレクタと第１のダイオードのアノードと第
１のコンデンサの片端を接続し、前記第１のダイオード
のカソードと第２のコンデンサの片端と第１の正出力端
子と前記制御回路の検出端子と第２のダイオードのアノ
ードを接続し、前記制御回路の制御端子と前記ＮＰＮト
ランジスタのベースを接続し、前記第１のコンデンサの
他端と第２のダイオードのカソードと第３のダイオード
のアノードを接続し、前記第３のダイオードのカソード
と第３のコンデンサの片端と第２の正出力端子を接続
し、前記第３のコンデンサの他端と前記制御回路の負電
源端子と前記ＮＰＮトランジスタのエミッタと前記第２
のコンデンサの他端と負電源入力端子と出力グランド端
子を接続したことを特徴とする。A switching power supply circuit of the present invention includes a positive input power supply terminal, a negative input power supply terminal, a first positive output terminal, a second positive output terminal, an output ground terminal, a control circuit, and a coil. An NPN transistor, a first diode, a second diode, a third diode, a first capacitor, a second capacitor and a third capacitor,
The positive input power supply terminal, one end of the coil and the positive power supply terminal of the control circuit are connected, and the other end of the coil is connected to the collector of the NPN transistor, the anode of the first diode and the one end of the first capacitor, The cathode of the first diode, one end of the second capacitor, the first positive output terminal, the detection terminal of the control circuit, and the anode of the second diode are connected, and the control terminal of the control circuit and the NPN transistor are connected. The base is connected, the other end of the first capacitor is connected to the cathode of the second diode and the anode of the third diode, and the cathode of the third diode, one end of the third capacitor and the second positive electrode are connected. The output terminal is connected to the other end of the third capacitor, the negative power supply terminal of the control circuit, the emitter of the NPN transistor, and the second terminal.
The other end of the capacitor is connected to the negative power supply input terminal and the output ground terminal.
【０００６】[0006]
【実施例】次に本発明について図面を参照して説明す
る。The present invention will be described below with reference to the drawings.
【０００７】図１は、本発明の一実施例の回路図であ
る。図において、１は正入力電源端子、２は負入力電源
端子、３はコイル、４は制御回路、５は第１のダイオー
ド、６は第２のダイオード、７は第３のダイオード、８
は第１のコンデンサ、９は第２のコンデンサ、１０は第
３のコンデンサ、１１はＮＰＮトランジスタ、１２は第
１の正出力端子、１３は第２の正出力端子、１４は出力
グランド端子である。FIG. 1 is a circuit diagram of an embodiment of the present invention. In the figure, 1 is a positive input power supply terminal, 2 is a negative input power supply terminal, 3 is a coil, 4 is a control circuit, 5 is a first diode, 6 is a second diode, 7 is a third diode, and 8
Is a first capacitor, 9 is a second capacitor, 10 is a third capacitor, 11 is an NPN transistor, 12 is a first positive output terminal, 13 is a second positive output terminal, and 14 is an output ground terminal. ..
【０００８】ＮＰＮトランジスタ１１がオンの時コイル
３にエネルギーが蓄積される。ＮＰＮトランジスタ１１
がオフの時、第１のダイオード５を通してコイル３のエ
ネルギーは第２のコンデンサ９に充電される。第２のコ
ンデンサ９の電圧が十分上昇すると、制御回路４は第２
のコンデンサ９の充電を停止する。これにより、第１の
出力端子に昇圧電圧が得られる。Energy is stored in the coil 3 when the NPN transistor 11 is turned on. NPN transistor 11
When is off, the energy of the coil 3 is charged in the second capacitor 9 through the first diode 5. When the voltage of the second capacitor 9 rises sufficiently, the control circuit 4
The charging of the capacitor 9 is stopped. As a result, a boosted voltage is obtained at the first output terminal.
【０００９】ＮＰＮトランジスタ１１がオンになった
時、第１のコンデンサ８は第２のコンデンサ９から第２
のダイオード６とＮＰＮトランジスタ１１のコレクタ−
エミッタを通して充電される。When the NPN transistor 11 is turned on, the first capacitor 8 changes from the second capacitor 9 to the second capacitor 9.
Collector of diode 6 and NPN transistor 11
Charged through the emitter.
【００１０】第２のダイオード６とＮＰＮトランジスタ
１１のコレクタ−エミッタ間の電圧損失が無視できるな
ら、これにより第１のコンデンサ８は、第２のコンデン
サ９と等しい電圧に充電される。If the voltage loss between the collector and the emitter of the second diode 6 and the NPN transistor 11 is negligible, this charges the first capacitor 8 to a voltage equal to that of the second capacitor 9.
【００１１】次にＮＰＮトランジスタ１１がオフになっ
た時、ＮＰＮトランジスタ１１のコレクタの電圧は第１
の正出力端子１２と等しい電圧まで上昇する。第１のコ
ンデンサ８は前述の通り第２のコンデンサ９と等しい電
圧に充電されているため第３のコンデンサ１０は第３の
ダイオード７を通して充電されるので、第１の正出力端
子１２の２倍の電圧になる。したがって第２の正出力端
子１３からは第１の正出力端子１２の２倍の電圧を取り
出すことが出来る。Next, when the NPN transistor 11 is turned off, the voltage of the collector of the NPN transistor 11 becomes the first voltage.
Rises to a voltage equal to that of the positive output terminal 12. Since the first capacitor 8 is charged to the same voltage as the second capacitor 9 as described above, the third capacitor 10 is charged through the third diode 7, and therefore the double of the first positive output terminal 12 is generated. Becomes the voltage of. Therefore, twice the voltage of the first positive output terminal 12 can be taken out from the second positive output terminal 13.
【００１２】[0012]
【発明の効果】以上説明したように、本発明は２個のコ
ンデンサと２個のダイオードを個使用することにより従
来の昇圧型スイッチング電源から正出力電圧の２倍の負
出力電圧が得られる。As described above, according to the present invention, the negative output voltage twice the positive output voltage can be obtained from the conventional step-up switching power supply by using the two capacitors and the two diodes.
【図１】本発明の一実施例の回路図。FIG. 1 is a circuit diagram of an embodiment of the present invention.
【図２】従来回路の一実施例の回路図。FIG. 2 is a circuit diagram of an example of a conventional circuit.
【符号の説明】 １ 正入力電源端子 ２ 負入力電源端子 ３ コイル ４ 制御回路 ５ 第１のダイオード ６ 第２のダイオード ７ 第３のダイオード ８ 第１のコンデンサ ９ 第２のコンデンサ １０ 第３のコンデンサ １１ ＮＰＮトランジスタ １２ 第１の正出力端子 １３ 第２の正出力端子 １４ 出力グランド端子[Explanation of symbols] 1 positive input power supply terminal 2 negative input power supply terminal 3 coil 4 control circuit 5 first diode 6 second diode 7 third diode 8 first capacitor 9 second capacitor 10 third capacitor 11 NPN transistor 12 1st positive output terminal 13 2nd positive output terminal 14 Output ground terminal
Claims (1)
の正出力端子と第２の正出力端子と出力グランド端子と
制御回路とコイルとＮＰＮトランジスタと第１のダイオ
ードと第２のダイオードと第３のダイオードと第１のコ
ンデンサと第２のコンデンサと第３のコンデンサを具備
し、 前記正入力電源端子とコイルの片端と前記制御回路の正
電源端子を接続し、前記コイルの他端と前記ＮＰＮトラ
ンジスタのコレクタと第１のダイオードのアノードと第
１のコンデンサの片端を接続し、前記第１のダイオード
のカソードと第２のコンデンサの片端と第１の正出力端
子と前記制御回路の検出端子と第２のダイオードのアノ
ードを接続し、前記制御回路の制御端子と前記ＮＰＮト
ランジスタのベースを接続し、前記第１のコンデンサの
他端と第２のダイオードのカソードと第３のダイオード
のアノードを接続し、前記第３のダイオードのカソード
と第３のコンデンサの片端と第２の正出力端子を接続
し、前記第３のコンデンサの他端と前記制御回路の負電
源端子と前記ＮＰＮトランジスタのエミッタと前記第２
のコンデンサの他端と負電源入力端子と出力グランド端
子を接続したことを特徴とするスイッチング電源回路。1. A positive input power supply terminal, a negative input power supply terminal, and a first
Positive output terminal, second positive output terminal, output ground terminal, control circuit, coil, NPN transistor, first diode, second diode, third diode, first capacitor, second capacitor, and And a capacitor connected to the positive input power supply terminal, one end of the coil and the positive power supply terminal of the control circuit, the other end of the coil, the collector of the NPN transistor, the anode of the first diode, and the first diode. One end of the capacitor is connected, the cathode of the first diode, one end of the second capacitor, the first positive output terminal, the detection terminal of the control circuit, and the anode of the second diode are connected, The control terminal is connected to the base of the NPN transistor, and the other end of the first capacitor, the cathode of the second diode and the anode of the third diode are connected. And the cathode of the third diode, one end of the third capacitor, and the second positive output terminal are connected, the other end of the third capacitor, the negative power supply terminal of the control circuit, and the emitter of the NPN transistor. And the second
The switching power supply circuit is characterized in that the other end of the capacitor is connected to the negative power supply input terminal and the output ground terminal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23085391A JPH0556634A (en) | 1991-08-19 | 1991-08-19 | Switching power circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23085391A JPH0556634A (en) | 1991-08-19 | 1991-08-19 | Switching power circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0556634A true JPH0556634A (en) | 1993-03-05 |
Family
ID=16914325
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP23085391A Pending JPH0556634A (en) | 1991-08-19 | 1991-08-19 | Switching power circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0556634A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006158047A (en) * | 2004-11-26 | 2006-06-15 | Sharp Corp | Power supply circuit and backlight unit |
| US7782028B2 (en) | 2006-07-14 | 2010-08-24 | Mitsumi Electric Co., Ltd. | DC-DC converter and power supply apparatus |
| JP2016092985A (en) * | 2014-11-05 | 2016-05-23 | 三星エスディアイ株式会社Ｓａｍｓｕｎｇ ＳＤＩ Ｃｏ．，Ｌｔｄ． | DC booster circuit |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03190560A (en) * | 1989-12-15 | 1991-08-20 | Matsushita Electric Ind Co Ltd | Power supply |
-
1991
- 1991-08-19 JP JP23085391A patent/JPH0556634A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03190560A (en) * | 1989-12-15 | 1991-08-20 | Matsushita Electric Ind Co Ltd | Power supply |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006158047A (en) * | 2004-11-26 | 2006-06-15 | Sharp Corp | Power supply circuit and backlight unit |
| US7782028B2 (en) | 2006-07-14 | 2010-08-24 | Mitsumi Electric Co., Ltd. | DC-DC converter and power supply apparatus |
| JP2016092985A (en) * | 2014-11-05 | 2016-05-23 | 三星エスディアイ株式会社Ｓａｍｓｕｎｇ ＳＤＩ Ｃｏ．，Ｌｔｄ． | DC booster circuit |
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