JPH0793818B2 - Multi-output constant current circuit - Google Patents
Multi-output constant current circuitInfo
- Publication number
- JPH0793818B2 JPH0793818B2 JP60046366A JP4636685A JPH0793818B2 JP H0793818 B2 JPH0793818 B2 JP H0793818B2 JP 60046366 A JP60046366 A JP 60046366A JP 4636685 A JP4636685 A JP 4636685A JP H0793818 B2 JPH0793818 B2 JP H0793818B2
- Authority
- JP
- Japan
- Prior art keywords
- current
- winding
- output
- circuit
- transformer
- 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 - Lifetime
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
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Description
【発明の詳細な説明】 〔概 要〕 昇降圧用トランスの出力側の複数個の負荷に一定の電流
を供給する多出力型定電流回路であって、このトランス
に単一の一次巻線と単一の制御回路を設け、いずれか１
つの負荷に流れる電流を検出して、その負荷に流れる電
流を安定化し、他の負荷に対しては、二次側を直列に接
続したカレントトランスを用いて、負荷電流を安定化す
る。これにより、制御回路とトランスの一次巻線の数を
減少させることができるので回路の小型化が可能とな
る。DETAILED DESCRIPTION OF THE INVENTION [Outline] A multi-output type constant current circuit for supplying a constant current to a plurality of loads on the output side of a step-up / step-down transformer, in which a single primary winding and a single winding are provided. One control circuit is provided, and either one
The current flowing through one load is detected and the current flowing through that load is stabilized, and for other loads, the load current is stabilized using a current transformer in which the secondary side is connected in series. As a result, the number of primary windings of the control circuit and the transformer can be reduced, so that the circuit can be downsized.
本発明は、多出力型定電圧流回路に関する。複数個の負
荷に対し一定の電流を供給する多出力型定電流回路に
は、出力電流を検出してそれを入力側に帰還し、常に定
電流が供給されるように制御がなされている。The present invention relates to a multi-output constant voltage circuit. In a multi-output type constant current circuit that supplies a constant current to a plurality of loads, the output current is detected and fed back to the input side so that a constant current is constantly supplied.
例えば、入力側に設けたトランジスタにより直流を継続
させ、それをトランスで昇圧した後整流回路を介して負
荷に定電流を供給するDC/DCコンバータでは、出力側と
入力側との間に制御回路が設けられ、この制御回路によ
って上記直流断続用トランジスタのオンオフ時間が制御
される。For example, in a DC / DC converter that continues direct current with a transistor provided on the input side, boosts it with a transformer, and then supplies a constant current to a load via a rectifier circuit, a control circuit between the output side and the input side. Is provided, and the control circuit controls the on / off time of the DC interrupting transistor.
従来の多出力型定電流回路は、第２図に示す構成を有し
ていた。The conventional multi-output type constant current circuit has the configuration shown in FIG.
第２図において、各負荷r1,r2…rnに供給される電流
i01,i02…i0nはそれぞれ検出抵抗rd1,rd2…rdnにより検
出され入力側の制御回路contへ入力される。In Fig. 2, the current supplied to each load r 1 , r 2 ... r n
i 01 , i 02 ... i 0n are respectively detected by the detection resistors rd 1 , rd 2 ... rd n and input to the control circuit cont on the input side.
各制御回路contの出力は駆動用トランスt2を介してトラ
ンジスタtrへ入力される。これにより、trの導通時間が
決定され、入力側の直流電源C1の出力時間が制御さるこ
とにより、出力側からは各負荷に対し常に一定の電流が
供給される。The output of each control circuit cont is input to the transistor tr via the driving transformer t 2 . As a result, the conduction time of tr is determined and the output time of the DC power supply C 1 on the input side is controlled, so that a constant current is always supplied to each load from the output side.
しかし、上記従来の回路は負荷の数に応じた定電流回路
が必要である。However, the above conventional circuit requires a constant current circuit according to the number of loads.
即ち、第２図に示すように、負荷r1,r2…rnに対応して
巻数比がそれぞれnp/n1,np/n2…np/nnの昇降圧用トラン
スt1が設けられ、かつそれらの入力側には同じ数のトラ
ンジスタ駆動用トランスt2と制御回路contが設けられて
いる。That is, as shown in FIG. 2, the step-up / down transformer t 1 having a turns ratio of n p / n 1 , n p / n 2 ... n p / n n corresponding to the loads r 1 , r 2 ... r n , respectively. And the same number of transistor driving transformers t 2 and control circuits cont are provided on their input sides.
更に検出抵抗rd1,rd2…rdnも負荷の数と同じだけ必要で
ある。Further, the detection resistors rd 1 , rd 2 ... rd n are required in the same number as the number of loads.
従って、従来回路は素子の負荷に比例して多くなり回路
の小型化が困難であるという問題点があった。Therefore, the number of conventional circuits increases in proportion to the load of the device, and it is difficult to reduce the size of the circuit.
本発明は上記問題点を解消し回路の小型化を目的とする
ものである。このための手段を第１図により説明する。
１つの入力巻線10と２つの出力巻線11,12を複数個有す
る昇降圧用トランス１が１個設けられている。この昇降
圧用トランス１の入力巻線10には直列に直流電源２と直
流断続用トランジスタ３が接続される。又出力巻線11に
のみ電流検出回路５が接続されている。更に出力巻線
11,12と各負荷113,123の間にはカレントトランス11,12
の一次側の巻線を接続すると共に該カレントトランスの
二次巻線を相互に直列に接続する。The present invention is intended to solve the above problems and reduce the size of a circuit. The means for this will be described with reference to FIG.
One input winding 1 0 and two output windings 1 1, 1 2 buck transformer 1 having a plurality of are provided one. This is for raising the input winding 1 0 of the step-down transformer 1 DC power source 2 and the DC intermittent transistor 3 in series are connected. The current detection circuit 5 only output winding 1 1 are connected. Further output winding
Current transformers 11, 12 are connected between 1 1 , 1 2 and each load 113, 123.
And the secondary windings of the current transformer are connected in series with each other.
制御回路４によりトランジスタ３をオン、オフし直流電
源２からの一次電流I0を断続することにより、二次巻線
11,12により電圧を誘起させる。この誘起された電圧は
ダイオード111,121により整流され、更にコンデンサ11
2,122により平滑し、負荷電流I01,I02とする。ここで負
荷電流I01は電流検出回路５で検出され制御回路４へ入
力する。これによりトランジスタ３のオン、オフ時間を
制御して負荷電流I01を安定化する。ここでカレントト
ランス11の二次側には巻数比に応じた電流が流れ、この
電流によってカレントトランス12の一次巻線に流れる電
流が決まるので、負荷電流I02も安定化される。The control circuit 4 turns on and off the transistor 3 to interrupt the primary current I 0 from the DC power supply 2 to make the secondary winding
A voltage is induced by 1 1 and 1 2 . This induced voltage is rectified by the diodes 111 and 121, and further the capacitor 11
It is smoothed by 2,122 to obtain load currents I 01 and I 02 . Here, the load current I 01 is detected by the current detection circuit 5 and input to the control circuit 4. This controls the on / off time of the transistor 3 to stabilize the load current I 01 . Here, a current according to the winding ratio flows on the secondary side of the current transformer 11, and the current flowing through the primary winding of the current transformer 12 is determined by this current, so the load current I 02 is also stabilized.
以下、本発明を実施例により添付図面を参照して説明す
る。Hereinafter, the present invention will be described by way of examples with reference to the accompanying drawings.
第２図は、本発明の実施例を示す図である。本実施例に
おいては、出力巻線をＮ個（11〜1n）設け、更に各出力
巻線N1〜Nnのそれぞれにカレントランス111,121…1nを
設けている。FIG. 2 is a diagram showing an embodiment of the present invention. In the present embodiment, N output windings (1 1 to 1 n ) are provided, and current lances 11 1 , 12 1 ... 1 n are provided to each of the output windings N 1 to Nn.
昇降圧用トランス１の入力巻線10に直流電源２と直流断
続用トランジスタ３が直列に接続されている。Temperature input winding 1 0 to the DC power source 2 and the DC intermittent transistor 3 of the step-down transformer 1 is connected in series.
一方各出力巻線には、それぞれ負荷113,123,…1n3とそ
れを流れる電流I01,I02…I0nを整流するためのダイオー
ド111,121,…1n1と平滑するためのコンデンサ112,122,
…1n2が、接続されている。On the other hand, in each output winding, loads 113, 123, ... 1n 3 and diodes 111, 121, ... 1n 1 for rectifying the currents I 01 , I 02, ... I 0n flowing therethrough and capacitors 112, 122,
… 1n 2 is connected.
上記各負荷と出力巻線間には、それぞれカレントトラン
ス11,12…1nが挿入されている。Current transformers 11, 12 ... 1n are respectively inserted between the loads and the output windings.
上記各カレントトランスの一方の巻線は、図示するよう
に、負荷と出力巻線間に接続され、他方の巻線は相互に
直列に接続されている。As shown, one winding of each current transformer is connected between the load and the output winding, and the other winding is connected in series with each other.
また第１番目の負荷113とコンデンサ112間には検出抵抗
５が接続され、該検出抵抗５と入力巻線の３間には制御
回路４とトランジスタ駆動用トランス６が設けられてい
る。以下、上記構成を有する回路の動作を説明する。The detection resistor 5 is connected between the first load 113 and the capacitor 112, and the control circuit 4 and the transistor driving transformer 6 are provided between the detection resistor 5 and the input winding 3. The operation of the circuit having the above configuration will be described below.
トランス１の第１番目の出力巻線12に誘起された起電力
により流出した電流はダイオード111によって整流され
ると共に交流分がコンデンサ112によって除かれ平滑さ
れた直流電流I01が負荷113を流れる。Flowing a direct current I 01 is the load 113 AC component is smoothed removed by the capacitor 112 together with the first output winding 1 2 induced leaked current by the electromotive force of the transformer 1 is rectified by the diode 111 .
この電流I01は抵抗５によって検出されて制御回路４と
駆動用トランス６によりトランジスタ３の導通時間が決
定される。これによりトランジスタ３はオンオフ動作を
繰り返し、直流電源２から電流I0が一定時間ごとに入力
巻線10を流れる。従って入力電流I0に比例した磁束が入
力巻線10から発生し、出力巻線11と鎖交する磁束に対応
して出力巻線11には起磁力が発生するので、出力巻線側
には常に一定の電流I01が流れる。This current I 01 is detected by the resistor 5 and the conduction time of the transistor 3 is determined by the control circuit 4 and the driving transformer 6. Thus transistor 3 repeats an on-off operation, the current I 0 flows through the input winding 1 0 every certain time from the DC power source 2. Thus magnetic flux is proportional to the input current I 0 is generated from the input winding 1 0, since the magnetomotive force is generated in the output winding 1 1 magnetic flux interlinking with the corresponding output winding 1 1, output winding A constant current I 01 always flows on the side.
カレントトランス11の巻数比を適切に選択すれば、例え
ば巻数比を１に設定すると等アンペアターンの法則によ
り、巻線を相互に直列に接続した回路７には上記定電流
I01が流れる。If the turns ratio of the current transformer 11 is properly selected, for example, if the turns ratio is set to 1, the above-mentioned constant current is applied to the circuit 7 in which the windings are connected in series according to the law of Ampere-turn.
I 01 flows.
第２番目移行の出力巻線12…1nにも起電力が発生する
が、各カレントトランス12…1nの巻数比を各負荷123,…
1n3の容量に応じて設定すれば、直列回路７を流れる電
流I01に比例した一定の電流I02,…I0nを流すことができ
る。Electromotive force is also generated in the output windings 1 2 ... 1 n of the second transition, but the turns ratio of each current transformer 12 ... 1 n is set to each load 123,
If set according to the capacity of 1n 3 , a constant current I 02 , ... I 0n proportional to the current I 01 flowing through the series circuit 7 can be made to flow.
第２番目以降の出力巻線について整流用ダイオードと平
滑コンデンサの働きは第１番目の出力巻線11と全く同様
である。The action of the rectifying diode and a smoothing capacitor for second and subsequent output winding is exactly the same 1 1 and the first output winding.
上記のとおり、本発明によれば昇降圧トランスの各出力
巻線に共通の直列巻線を有するカレントトランスを設け
ることにより、 上記カレントトランスの共通の直列巻線回路に流れる電
流に比例した電流を各負荷に供給することができるの
で、上記直流継続用トラジスタとその駆動用トランスと
制御回路と検出抵抗が１個だけで済むこととなり、回路
の小型化が図れる。As described above, according to the present invention, by providing a current transformer having a common series winding for each output winding of the step-up / down transformer, a current proportional to the current flowing in the common series winding circuit of the current transformer is generated. Since each load can be supplied, only one of the DC continuation transistor, the driving transformer, the control circuit, and the detection resistor is required, and the circuit can be downsized.
第１図は本発明の原理図、第２図は本発明の実施例を示
す図、第３図は従来回路の構成図である １……昇降圧用トランス、 ２……直流電源、 10……昇降圧用トランスの入力巻線、 11,12,…1n……昇降圧用トランスの出力巻線、 ３……直流継続用トランジスタ、 ４……制御回路、 ５……検出抵抗、 ６……駆動用トランス、 ７……直列回路、 11,12,…1n……カレントトランス、 111,121,…1n1……整流用ダイオード、 112,122,…1n2……平滑用コンデンサ、 113,132,…1n3……負荷。Figure 1 is a principle diagram of the present invention, FIG. FIG. 2 illustrates an embodiment of the present invention, FIG. 3 is 1 ...... buck transformer is a configuration diagram of a conventional circuit, 2 ...... DC power supply, 1 0 ... … Buck-boost transformer input winding, 1 1 , 1 2 , ... 1 n …… Buck-boost transformer output winding 3 …… DC continuation transistor 4 …… Control circuit 5 …… Detection resistor 6 ・ ・ ・... driving transformer, 7 ...... series circuit, 11, 12, ... 1n ...... current transformer, 111 and 121, ... 1n 1 ...... rectifying diode, 112, 122, ... 1n 2 ...... smoothing capacitor, 113,132, ... 1n 3 ... …load.
Claims (1)
昇降圧用トランス、 該入力巻線に直列に接続された直流電源およびトランジ
スタ、 該各出力巻線にそれぞれ直列に一次巻線が接続されると
ともに二次巻線が閉路を形成し該閉路に流れる電流がつ
くる磁界が各一次巻線に流れる電流がつくる磁界を打ち
消すように相互接続された複数のカレントトランス、及
び いずれか１つの出力巻線に流れる負荷電流に応じて、該
トランジスタのオンオフを制御する制御回路を有するこ
とを特徴とする多出力型定電流回路。1. A step-up / down transformer having a single input winding and a plurality of output windings, a DC power supply and a transistor connected in series to the input windings, and a primary winding connected in series to each output winding. A plurality of current transformers connected to each other so that the secondary winding forms a closed circuit and the magnetic field created by the current flowing through the closed path cancels the magnetic field created by the current flowing through each primary winding; and any one of A multi-output type constant current circuit having a control circuit for controlling on / off of the transistor according to a load current flowing through one output winding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60046366A JPH0793818B2 (en) | 1985-03-11 | 1985-03-11 | Multi-output constant current circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60046366A JPH0793818B2 (en) | 1985-03-11 | 1985-03-11 | Multi-output constant current circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61207172A JPS61207172A (en) | 1986-09-13 |
| JPH0793818B2 true JPH0793818B2 (en) | 1995-10-09 |
Family
ID=12745154
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60046366A Expired - Lifetime JPH0793818B2 (en) | 1985-03-11 | 1985-03-11 | Multi-output constant current circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0793818B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5008794A (en) * | 1989-12-21 | 1991-04-16 | Power Integrations, Inc. | Regulated flyback converter with spike suppressing coupled inductors |
| TW200950299A (en) | 2008-05-30 | 2009-12-01 | Gio Optoelectronics Corp | Single-stage AC to DC conversion device |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5687115A (en) * | 1979-12-18 | 1981-07-15 | Tdk Corp | Switching power source |
| JPS5947974A (en) * | 1982-09-13 | 1984-03-17 | Toshiba Corp | Multioutput switching power source |
-
1985
- 1985-03-11 JP JP60046366A patent/JPH0793818B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61207172A (en) | 1986-09-13 |
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