JPH0793819B2 - Constant current supply circuit - Google Patents
Constant current supply circuitInfo
- Publication number
- JPH0793819B2 JPH0793819B2 JP60105925A JP10592585A JPH0793819B2 JP H0793819 B2 JPH0793819 B2 JP H0793819B2 JP 60105925 A JP60105925 A JP 60105925A JP 10592585 A JP10592585 A JP 10592585A JP H0793819 B2 JPH0793819 B2 JP H0793819B2
- Authority
- JP
- Japan
- Prior art keywords
- current
- current supply
- supply circuit
- constant current
- windings
- 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
-
- 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
- H02M1/00—Details of apparatus for conversion
- H02M1/0083—Converters characterised by their input or output configuration
- H02M1/009—Converters characterised by their input or output configuration having two or more independently controlled outputs
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Description
【発明の詳細な説明】 〔概 要〕 本発明に係る定電流供給回路は、１つの制御系で複数の
独立した負荷に定電流を供給するようにしたもので、複
数の電流供給回路のうちの特定の１つにのみフィードバ
ック信号として供給電流を検出する素子を設ける。一方
各電流供給回路に変流器を設け、この変流器を各電流供
給回路の供給電流が上記フィードバック信号によって制
御され得るように特定の電流供給回路に設けられた変流
器と所定の関係をもって接続する。これにより、多出力
定電流回路において、単一の制御回路により、全ての出
力の定電流化を行なうことができるので、回路構成を簡
略化できる。DETAILED DESCRIPTION [Overview] A constant current supply circuit according to the present invention is configured to supply a constant current to a plurality of independent loads by one control system. An element for detecting the supply current as a feedback signal is provided only in a specific one of the above. On the other hand, each current supply circuit is provided with a current transformer, and this current transformer is connected in a predetermined relationship with the current transformer provided in a specific current supply circuit so that the supply current of each current supply circuit can be controlled by the feedback signal. To connect. As a result, in the multi-output constant current circuit, all outputs can be made constant current by a single control circuit, so that the circuit configuration can be simplified.
本発明は昇降圧形定電流供給回路に関する。 The present invention relates to a buck-boost type constant current supply circuit.
従来の定電流回路に於いて各々の独立した定電流出力を
得るためには、第５図及び第６図に図示の如く、負荷抵
抗器213,223,233の数に比例した制御回路1113、パルス
トランス101,106,109、トランジスタ102,104,107、変圧
器110〜112および各電流供給回路21′〜23′から成る定
電流回路が必要であった。In order to obtain each independent constant current output in the conventional constant current circuit, as shown in FIGS. 5 and 6, the control circuit 1113, the pulse transformers 101, 106, 109, which are proportional to the number of the load resistors 213, 223, 233, A constant current circuit consisting of transistors 102, 104, 107, transformers 110-112 and respective current supply circuits 21'-23 'was required.
この結果、各回路に使用されている制御回路11〜13及び
トランジスタ102,106,107及びトランス101,106,109,110
〜112も負荷の数に比例し、電流検出素子としての抵抗
器213,223,233も負荷の数に比例し規模が大きく且つ高
価格となっていた。As a result, the control circuits 11 to 13 and the transistors 102, 106, 107 and the transformers 101, 106, 109, 110 used in each circuit are
.About.112 are also proportional to the number of loads, and the resistors 213, 223, and 233 as current detecting elements are also proportional to the number of loads and are large in scale and expensive.
本発明について第１図を参照して述べる。 The present invention will be described with reference to FIG.
第１図は、前述の第５図に対応する負荷が２つの場合の
本発明による定電流供給回路の回路図である。第１図に
おいて、１つの制御回路１、１つのトランジスタ102、
１つの直流電源104及び１個の主変圧器110が図示の如く
接続されている。主変圧器110は一次巻線103と２個の独
立した二次巻線211,221を有している。二次巻線211およ
び221の後段にはそれぞれ負荷抵抗器213,223に直流電流
を供給するための整流器212,222とキャパシタ214,224が
接続されている。FIG. 1 is a circuit diagram of a constant current supply circuit according to the present invention when there are two loads corresponding to FIG. 5 described above. In FIG. 1, one control circuit 1, one transistor 102,
One DC power source 104 and one main transformer 110 are connected as shown. The main transformer 110 has a primary winding 103 and two independent secondary windings 211 and 221. Rectifiers 212 and 222 and capacitors 214 and 224 for supplying a direct current to the load resistors 213 and 223 are connected to the subsequent stages of the secondary windings 211 and 221 respectively.
上記電流供給回路21,22にはそれぞれ変流器225の巻線が
直列に接続されている。また一方の電流供給回路22には
電流検出素子としての抵抗器226が設けられている。The windings of the current transformer 225 are connected in series to the current supply circuits 21 and 22, respectively. Further, the current supply circuit 22 on one side is provided with a resistor 226 as a current detection element.
制御回路１は従来のものと同様、基準電圧発生器、増幅
器、パルス幅制御回路等を有しており、抵抗器226から
の信号に応じて、トランジスタ102をオン又はオフする
パルス出力のパルス幅を変化させる。The control circuit 1 has a reference voltage generator, an amplifier, a pulse width control circuit, etc. as in the conventional one, and the pulse width of the pulse output for turning on or off the transistor 102 according to the signal from the resistor 226. Change.
以下第１図に図示の回路の動作について述べる。 The operation of the circuit shown in FIG. 1 will be described below.
先ず制御回路１からのパルス出力がトランジスタ102を
オンさせる。これにより主変圧器110の一次巻線103に電
源104からの電力が蓄積される。この蓄積電力は、トラ
ンジスタ102がオフした場合、それぞれ独立な二次巻線2
11,221に伝達される。伝達された電力が整流器212,222
で整流され、キャパシタ214,224で平滑され、一定の直
流電流が負荷213,223に印加される。First, the pulse output from the control circuit 1 turns on the transistor 102. As a result, the electric power from the power supply 104 is stored in the primary winding 103 of the main transformer 110. When the transistor 102 is turned off, this accumulated power is supplied to the independent secondary winding 2
It is transmitted to 11,221. The transmitted power is rectifier 212,222
Is rectified, smoothed by the capacitors 214 and 224, and a constant DC current is applied to the loads 213 and 223.
この基本的動作は従来の場合と同様であるが、回路の信
号波形を第２図（ａ）〜（ｃ）に示す。第２図（ａ）は
トランジスタ102のコレクタ・エミッタ間の電圧を示
す。第２図（ｂ）はキャパシタ214又は224に流れる電流
Ic、第２図（ｃ）は整流器212又は222に流れる電流IDを
示す。This basic operation is similar to the conventional case, but the signal waveforms of the circuit are shown in FIGS. 2 (a) to 2 (c). FIG. 2A shows the voltage between the collector and the emitter of the transistor 102. 2 (b) shows the current flowing through the capacitor 214 or 224.
Ic, FIG. 2 (c) shows the current I D flowing through the rectifier 212 or 222.
第１図回路において電流供給回路21と22とが変流器225
で結合されている。変流器225の巻数比を図示の如くn1:
n2とし、流れる電流をI1,I2とすると、等アンペアター
ンの法則に従い、n1I1＝n2I2となる。従って、主変圧器
110の一方の２次巻線211から流れる電流は、変流器225
により、他方の２次巻線221から流れる電流に比例し、
平滑キャパシタ214,224にて平滑され、定電流化された
出力電流として、負荷抵抗器213,223に供給される。こ
の出力電流が抵抗器226で検出され、制御回路１にてト
ランジスタ102の導通時間を決めることにより、定電流
が実現できる。In the circuit of FIG. 1, the current supply circuits 21 and 22 are current transformers 225.
Are joined by. The turns ratio of the current transformer 225 is n 1 :
If n 2 and the flowing currents are I 1 and I 2 , then n 1 I 1 = n 2 I 2 according to the law of equal ampere-turn. Therefore, the main transformer
The current flowing from one of the secondary windings 211 of the 110 is the current transformer 225
Is proportional to the current flowing from the other secondary winding 221
The output currents, which are smoothed by the smoothing capacitors 214 and 224 and converted into a constant current, are supplied to the load resistors 213 and 223. This output current is detected by the resistor 226, and the control circuit 1 determines the conduction time of the transistor 102, whereby a constant current can be realized.
第３図に本発明の実施例を示す。第３図に図示の定電流
供給回路は、独立した３個の負荷213,223,233に定電流
を供給するようにしたもので、第１図に図示の回路を拡
張したものである。すなわち電流供給回路21に２個の変
流器216,217の一方の巻線を直列に接続し、他方の巻線
をそれぞれ他方の電流供給回路22,23に接続させたもの
である。FIG. 3 shows an embodiment of the present invention. The constant current supply circuit shown in FIG. 3 is designed to supply a constant current to three independent loads 213, 223 and 233, and is an extension of the circuit shown in FIG. That is, one winding of the two current transformers 216 and 217 is connected in series to the current supply circuit 21, and the other winding is connected to the other current supply circuits 22 and 23, respectively.
動作は第１図の場合と同様である。The operation is similar to that of FIG.
第４図に本発明の他の実施例を示す。第４図の定電流供
給回路は、５個の独立した負荷抵抗器213,223,233,243,
253に定電流を供給し得るようにしたものであるが、変
流器216,226,246,256の接続関係が第１図および第３図
に図示の場合と異なる。すなわち、特定の１つの電流供
給回路21の中心として、変流器を介して、それぞれ電流
供給回路 21,22,23、および、21,24,25が順次結合され
るようになっている。FIG. 4 shows another embodiment of the present invention. The constant current supply circuit of FIG. 4 has five independent load resistors 213,223,233,243,
Although a constant current can be supplied to 253, the connection relationship of the current transformers 216, 226, 246, 256 is different from that shown in FIGS. 1 and 3. That is, as a center of one specific current supply circuit 21, the current supply circuits 21, 22, 23, and 21, 24, 25 are sequentially coupled via the current transformer.
電流検出用抵抗器215が設けられた電流供給回路21を中
心として図中上下平衡になるように電流供給回路を結合
させている。この回路構成は特に負荷が多くなった場
合、第１図又は第３図に図示の回路に比し、好適であ
る。The current supply circuit 21 is provided with a current detection resistor 215 as a center, and the current supply circuits are coupled so as to be vertically balanced in the figure. This circuit configuration is preferable as compared with the circuit shown in FIG. 1 or FIG. 3, especially when the load becomes large.
以上の実施例において、各電流供給回路の定電流値はそ
れぞれ任意に設定することができる。すなわち、主変圧
器110の二次巻線211,221,231,241,251と一次巻線の比を
任意に設定することにより実現することができる。これ
により各変流器の変流比も変化させたものとなる。In the above embodiments, the constant current value of each current supply circuit can be set arbitrarily. That is, it can be realized by arbitrarily setting the ratio between the secondary windings 211, 221, 231, 241, 251 of the main transformer 110 and the primary winding. As a result, the current ratio of each current transformer is also changed.
本発明の実施に際しては以上に述べたものの外、種々の
変形形態を採ることができる。例えば、第３図の回路構
成と第４図の回路構成とを適宜組合せることができる。In implementing the present invention, various modifications other than those described above can be adopted. For example, the circuit configuration of FIG. 3 and the circuit configuration of FIG. 4 can be combined appropriately.
尚、これらによっても、各負荷に提供される電流は電気
的に絶縁されており、独自性が保持されている。また従
来の同様に負荷に定電流を供給することができる。Even with these, the current provided to each load is electrically insulated, and the originality is maintained. Also, a constant current can be supplied to the load as in the conventional case.
以上に述べたように、変流器の数が（負荷の数−１）個
だけ必要となるが、電流検出素子は１個のみでよく、制
御回路１、トランジスタ102、主変圧器116も１個のみで
よい。従って、回路構成が著しく簡単になり、小形且つ
低価格化が実現できる。As described above, the number of current transformers (number of loads-1) is required, but only one current detection element is required, and the control circuit 1, the transistor 102, and the main transformer 116 are also one. Only one is required. Therefore, the circuit configuration is remarkably simplified, and the size and cost can be reduced.
第１図は本発明の原理を示す図、 第２図は第１図に図示の回路の信号波形図、 第３図及び第４図は本発明の他の実施例としての定電流
供給回路を示す図、 第５図および第６図は従来の定電流供給回路を示す図、
である。 （符号の説明） １……制御回路、 101……パルストランス、 102……トランジスタ、 104……電源、 110……主変圧器、 21〜25……電流供給回路、 212,222,232,242,252……整流器、 214,224,234,244,254……キャパシタ、 216,226,246,256……変流器。FIG. 1 is a diagram showing the principle of the present invention, FIG. 2 is a signal waveform diagram of the circuit shown in FIG. 1, and FIGS. 3 and 4 show a constant current supply circuit as another embodiment of the present invention. FIG. 5, FIG. 5 and FIG. 6 are views showing a conventional constant current supply circuit,
Is. (Description of symbols) 1 ... Control circuit, 101 ... Pulse transformer, 102 ... Transistor, 104 ... Power supply, 110 ... Main transformer, 21-25 ... Current supply circuit, 212,222,232,242,252 ... Rectifier, 214,224,234,244,254 ... … Capacitors, 216,226,246,256 …… Current transformers.
Claims (3)
変圧器（110）、 該複数の二次巻線の１つの特定の二次巻線のみに接続さ
れた電流検出器（226）、 電磁的に結合された巻線を夫々異なる該二次巻線に各二
次巻線に流れる電流によって生じる磁界が相互に打ち消
し合うように接続された変流器（225）、 該電流検出器（226）の出力に基づいて、該一次巻線（1
03）に接続されたトランジスタ（102）のオン、オフを
制御する制御回路（１）、 を設けたことを特徴とする定電流供給回路。1. A transformer (110) having a single primary winding and a plurality of secondary windings, a current detector connected to only one particular secondary winding of the plurality of secondary windings. (226), a current transformer (225) in which electromagnetically coupled windings are connected to different secondary windings so that magnetic fields generated by currents flowing in the respective secondary windings cancel each other. Based on the output of the current detector (226), the primary winding (1
A constant current supply circuit, comprising a control circuit (1) for controlling on / off of a transistor (102) connected to 03).
ぞれの一方の巻線が直列に接続され、他方の巻線のそれ
ぞれが他の二次巻線に接続されている、特許請求の範囲
第１項に記載の定電流供給回路。2. One of the windings of each of the plurality of current transformers is connected in series to the specific secondary winding, and each of the other windings is connected to another secondary winding. The constant current supply circuit according to claim 1.
２つの巻線のうちの一方の巻線が直列に接続され、他方
の巻線が、前記特定の電流供給回路を中心として、隣接
する電流供給回路内に順次直列的関係で接続されるよう
に設けられている、特許請求の範囲第１項に記載の定電
流供給回路。3. One of the two windings of the current transformer is connected in series to each of the plurality of secondary windings, and the other winding serves as the center of the specific current supply circuit. The constant current supply circuit according to claim 1, wherein the constant current supply circuit is provided so as to be sequentially connected in series in adjacent current supply circuits.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60105925A JPH0793819B2 (en) | 1985-05-20 | 1985-05-20 | Constant current supply circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60105925A JPH0793819B2 (en) | 1985-05-20 | 1985-05-20 | Constant current supply circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61266068A JPS61266068A (en) | 1986-11-25 |
| JPH0793819B2 true JPH0793819B2 (en) | 1995-10-09 |
Family
ID=14420433
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60105925A Expired - Lifetime JPH0793819B2 (en) | 1985-05-20 | 1985-05-20 | Constant current supply circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0793819B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4128549B2 (en) | 2004-01-22 | 2008-07-30 | 株式会社小糸製作所 | Vehicle lighting |
| JP2005348592A (en) * | 2004-06-07 | 2005-12-15 | Koito Mfg Co Ltd | Power supply equipment and vehicular-type lighting fixture |
| JP2011114924A (en) * | 2009-11-26 | 2011-06-09 | Funai Electric Co Ltd | Power supply circuit, backlight system, and video display device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5687115A (en) * | 1979-12-18 | 1981-07-15 | Tdk Corp | Switching power source |
-
1985
- 1985-05-20 JP JP60105925A patent/JPH0793819B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61266068A (en) | 1986-11-25 |
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