JPH0479231B2 - - Google Patents
Info
- Publication number
- JPH0479231B2 JPH0479231B2 JP59013089A JP1308984A JPH0479231B2 JP H0479231 B2 JPH0479231 B2 JP H0479231B2 JP 59013089 A JP59013089 A JP 59013089A JP 1308984 A JP1308984 A JP 1308984A JP H0479231 B2 JPH0479231 B2 JP H0479231B2
- Authority
- JP
- Japan
- Prior art keywords
- current
- transformer
- winding
- circuit
- point
- 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
- 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
- H02M3/338—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 in a self-oscillating arrangement
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Electrical Variables (AREA)
- Dc-Dc Converters (AREA)
Description
【発明の詳細な説明】
(1) 発明の技術分野
本発明は負荷側の障害に対しても格別大型規格
の素子を使用することなく、また構成を簡易化し
た中点直接接地型定電流回路に関する。[Detailed Description of the Invention] (1) Technical Field of the Invention The present invention provides a center-point directly grounded constant current circuit that does not require the use of particularly large-sized elements and has a simplified configuration even in the case of faults on the load side. Regarding.
(2) 技術の背景
電池などの直流電源に接続したスイツチング素
子によりパルス状電流を得て、変成器により昇圧
後整流する直流−直流コンバータにおいて、前記
整流後の直流電圧を基準値と比較して、出力直流
電圧を一定化するように前記スイツチング素子を
開閉する時間を制御することが一般的に行われて
いる。このコンバータにおいて、中点直接接地型
定電流回路は、一方の線が地絡時、他方の線の電
圧は上昇しないと言う理由から、近年使用され出
して来た。(2) Background of the technology In a DC-DC converter, a pulsed current is obtained by a switching element connected to a DC power source such as a battery, and the voltage is boosted and rectified by a transformer.The DC voltage after the rectification is compared with a reference value. It is common practice to control the opening and closing times of the switching elements so as to keep the output DC voltage constant. In this converter, a center-point directly grounded constant current circuit has been used in recent years because when one line is grounded, the voltage on the other line does not rise.
(3) 従来技術及び問題点
第１図は従来の直流−直流コンバータを示す回
路図である。直流電源Ｖはスイツチング素子とし
てのトランジスタTRを介して変成器Ｔ１の一次
巻線と接続される。二次側（出力側）にはＮ１，
Ｎ２の出力巻線と、後述する他の出力巻線を有し
ている。出力巻線Ｎ１，Ｎ２にはダイオードＤ
１，Ｄ２、コンデンサＣ１，Ｃ２、抵抗Ｒ１，Ｒ
２で構成される整流平滑回路を介し、巻線の接続
点及び負荷RLと接続している。そして２つの出
力巻線を接続することになる点Ｅを接地する。点
Ｅと巻線の他方端との電位差VR1を一定化するた
め、基準電圧Vrf1の電圧と比較し、増幅器AMP
１により差電圧を増幅し、それが零となる方向に
パルス幅変調回路PWMを制御し、即ちトランジ
スタTRの開閉時間を制御している。このとき抵
抗Ｒ１とＲ２は負荷への出力電流が過大となるこ
とを検出する回路の素子としても動作している。
例えば第２巻線Ｎ２の一端と接続している図示の
「＋」の線が接地に短絡したとき（図のスイツチ
Ｓを矢印の状態に閉じた状態で等価的に示す）巻
線Ｎ２は抵抗Ｒ２のみの短絡回路となり過大電流
が流れようとする。これより抵抗Ｒ２の両端電位
差が急上昇し、この状態は、増幅器AMP３によ
り検出される。即ち通常は抵抗Ｒ２の両端電位差
が基準電圧源Vrf3と同程度であるため、増幅器
AMP３の出力がないけれど、抵抗Ｒ２の両端電
位差が基準電圧源Vrf3の値より大となつたとき、
増幅器AMP３の出力に生じる。この出力は過電
流遮断信号としてパルス幅変調回路PWMに印加
され、回路の動作を停止させる。基準電圧源
Vrf1とVrf3の値は後者が約２割大きく、増幅器
AMP３は地絡のような障害に対し、定電流回路
の保護をはかるため増幅器AMP１に対しバツク
アツプの意味を持つている。そしてこの過大電流
対策回路は地絡が「＋」線「−」線の何れに起こ
つた場合にも対処するため、増幅器と基準電圧源
の組合せを２組即ちAMP２、Vrf2及びAMP３、
Vrf3と、更にそれらの駆動用電源として巻線Ｎ
３，Ｎ４、ダイオードＤ３，Ｄ４、コンデンサＣ
３，Ｃ４のように同種回路２組を必要とした。そ
して変成器Ｔ１の第１・第２巻線のダイオードＤ
１・Ｄ２は負荷側障害に対し、スイツチングトラ
ンジスタTRの動作停止までは直ぐ破壊されず動
作の確実性を期するため、必要以上に大電流用の
規格のものを使用していた。(3) Prior art and problems FIG. 1 is a circuit diagram showing a conventional DC-DC converter. The DC power supply V is connected to the primary winding of the transformer T1 via a transistor TR as a switching element. N1 on the secondary side (output side),
It has an output winding of N2 and other output windings to be described later. A diode D is connected to the output windings N1 and N2.
1, D2, capacitor C1, C2, resistor R1, R
It is connected to the connection point of the windings and the load RL via a rectifying and smoothing circuit composed of 2. Then, point E, which connects the two output windings, is grounded. In order to keep the potential difference VR 1 between point E and the other end of the winding constant, it is compared with the voltage of reference voltage Vrf 1 , and the amplifier AMP
1, the differential voltage is amplified and the pulse width modulation circuit PWM is controlled in the direction in which the differential voltage becomes zero, that is, the opening/closing time of the transistor TR is controlled. At this time, the resistors R1 and R2 also operate as elements of a circuit that detects when the output current to the load becomes excessive.
For example, when the illustrated "+" wire connected to one end of the second winding N2 is short-circuited to ground (equivalently shown with the switch S in the figure closed as shown by the arrow), the winding N2 becomes a resistor. Only R2 becomes a short circuit, and excessive current attempts to flow. As a result, the potential difference across the resistor R2 rises rapidly, and this state is detected by the amplifier AMP3. In other words, since the potential difference across the resistor R2 is normally about the same as the reference voltage source Vrf3 , the amplifier
Although there is no output from AMP3, when the potential difference across resistor R2 becomes larger than the value of reference voltage source Vrf3 ,
occurs at the output of amplifier AMP3. This output is applied as an overcurrent cutoff signal to the pulse width modulation circuit PWM, stopping the operation of the circuit. Reference voltage source
The latter value is about 20% larger than that of Vrf 1 and Vrf 3 , and the amplifier
AMP3 serves as a backup for amplifier AMP1 in order to protect the constant current circuit against faults such as ground faults. This overcurrent countermeasure circuit uses two combinations of amplifiers and reference voltage sources, namely AMP2, Vrf 2 , and AMP3, in order to cope with the case where a ground fault occurs on either the "+" or "-" wire.
Vrf 3 and winding N as a power source for driving them.
3, N4, diodes D3, D4, capacitor C
3. Required two sets of similar circuits like C4. And the diode D of the first and second windings of the transformer T1
1 and D2 were used with a larger current rating than necessary in order to ensure that the switching transistor TR would not be immediately destroyed until the switching transistor TR stopped operating in the event of a fault on the load side.
(4) 発明の目的
本発明の目的は前述の欠点を改善し、負荷側の
障害に対しても規格に大型規格の素子を使用する
ことなく、トランスＴ１の二次巻線のＮ１とＮ２
に流れる電流のバイパスを容易に採ることができ
るように回路構成を簡易化した中点直接接地型定
電流回路を提供することにある。(4) Purpose of the Invention The purpose of the present invention is to improve the above-mentioned drawbacks, and to prevent failures on the load side by reducing N1 and N2 of the secondary winding of the transformer T1 without using large standard elements.
An object of the present invention is to provide a center point directly grounded constant current circuit whose circuit configuration is simplified so that a bypass of the current flowing through the circuit can be easily taken.
(5) 発明の構成
前述の目的を達成するための本発明の構成は、
変成器の一次側巻線に開閉素子を挿入し、該変成
器の二つの二次側巻線はその一方端を各整流回路
を介して負荷と接続し、且つ他方端は中点直接接
地し、前記開閉素子によつて直流電流を開閉し、
得られた交流電流を変成器によつて昇圧させ、前
記接地点と各巻線の一方端との電位差を基準値と
比較した値により前記開閉素子の動作を制御し
て、一定化直流電流を得る中点直接接地型定電流
回路において、前記二つの二次側巻線の他方端と
接地点間に電流変成器を挿入し、該電流変成器の
一次側・二次側各巻線は互いに同方向巻線で形成
し、打ち消し方向の電流を流すことである。(5) Structure of the invention The structure of the present invention to achieve the above-mentioned object is as follows:
A switching element is inserted into the primary winding of the transformer, and one end of the two secondary windings of the transformer is connected to the load via each rectifier circuit, and the other end is directly grounded at the midpoint. , switching the DC current by the switching element,
The obtained alternating current is boosted by a transformer, and the operation of the switching element is controlled by a value obtained by comparing the potential difference between the grounding point and one end of each winding with a reference value, thereby obtaining a constant direct current. In a center-point directly grounded constant current circuit, a current transformer is inserted between the other ends of the two secondary windings and the ground point, and the primary and secondary windings of the current transformer are in the same direction as each other. It is formed by winding wire and allows current to flow in the canceling direction.
(6) 発明の実施例
第２図は本発明実施例の構成を示す回路図であ
る。第１図と同一符号は同様のものを示す。Ｔ２
は電流変成器を示し、は一次巻線、は二次巻
線、1，2は各巻線の電流である。また・印は
巻線の巻始めを示し、一次、二次各巻線の巻始め
が変成器Ｔ１の二次側出力巻線Ｎ１，Ｎ２側に、
また各巻終わりが点「Ｅ」側に接続されている。
負荷RLに一定電流を流す動作は第１図と同様で
ある。即ち抵抗Ｒ１に流れる電流に変化があつた
とき、その両端の電位差VR1が検出し、定電流化
信号を増幅器AMP１が出力する。そのため、パ
ルス幅変調回路PWMが抵抗Ｒ１に流れる電流
を、従前の値とする方向にスイツチングトランジ
スタTRの動作を制御する。(6) Embodiment of the invention FIG. 2 is a circuit diagram showing the configuration of an embodiment of the invention. The same reference numerals as in FIG. 1 indicate similar parts. T2
indicates a current transformer, is the primary winding, is the secondary winding, and 1 and 2 are the currents in each winding. In addition, the mark indicates the beginning of winding, and the beginning of winding of each primary and secondary winding is on the secondary output winding N1, N2 side of transformer T1,
Further, the end of each winding is connected to the point "E" side.
The operation of causing a constant current to flow through the load RL is the same as that shown in FIG. That is, when the current flowing through the resistor R1 changes, the potential difference V R1 across the resistor R1 is detected, and the amplifier AMP1 outputs a constant current signal. Therefore, the pulse width modulation circuit PWM controls the operation of the switching transistor TR in such a way that the current flowing through the resistor R1 is maintained at the previous value.
今第１図と同様に「＋」線に地絡の障害が発生
したとき、ダイオードＤ２、巻線、Ｎ２に大電
流が流れようとするが、電流変成器Ｔ２は一次巻
線・二次巻線の電流を互いに等しくするように動
作することから、地絡前の出力電流１の状態で
流れる。また「−」線の地絡障害でも同様に電流
を抑圧することができる。 Now, as in Figure 1, when a ground fault occurs in the "+" wire, a large current tries to flow through the diode D2, the winding, and N2, but the current transformer T2 Since the line currents are made equal to each other, the output current is 1 before the ground fault. Furthermore, the current can be similarly suppressed even in the case of a ground fault in the "-" line.
(7) 発明の効果
このようにして本発明によると、定電流化動作
用回路としての増幅器、基準電圧源が１組で良
く、過大電流対策回路は使用する必要がないの
で、構成が極めて簡易化される。また障害発生の
ときもダイオードのような素子に大電流が流れる
ことを有効に防止できるから、素子として通常規
格のものを使用することで良い。(7) Effects of the Invention As described above, according to the present invention, only one set of amplifier and reference voltage source is required as a circuit for constant current operation, and there is no need to use an overcurrent countermeasure circuit, so the configuration is extremely simple. be converted into Further, even in the event of a failure, it is possible to effectively prevent large current from flowing through elements such as diodes, so it is sufficient to use elements of normal standards.
第１図は従来の直流−直流コンバータを使用す
る中点直接接地型定電流回路の構成図、第２図は
本発明の実施例の回路図である。
Ｖ……直流電圧源、TR……トランジスタ、T1
……変成器、T2……電流変成器、Ｎ１，Ｎ２…
…出力巻線、Vrf1，Vrf2，Vrf3……基準電圧源、
AMP１，AMP２，AMP３……増幅器、PWM
……パルス幅変調回路、Ｅ……出力巻線中点、Ｄ
１〜Ｄ５……ダイオード、Ｒ１，Ｒ２……抵抗。
FIG. 1 is a block diagram of a center-point directly grounded constant current circuit using a conventional DC-DC converter, and FIG. 2 is a circuit diagram of an embodiment of the present invention. V...DC voltage source, TR...transistor, T 1
...Transformer, T 2 ...Current transformer, N1, N2...
...Output winding, Vrf 1 , Vrf 2 , Vrf 3 ...Reference voltage source,
AMP1, AMP2, AMP3...Amplifier, PWM
...Pulse width modulation circuit, E...Output winding midpoint, D
1 to D5...Diode, R1, R2...Resistance.
Claims (1)
変成器の二つの二次側巻線はその一方端を各整流
回路を介して負荷と接続し、且つ他方端は中点直
接接地し、前記開閉素子によつて直流電流を開閉
し、得られた交流電流を変成器によつて昇圧さ
せ、前記接地点と各巻線の一方端との電位差を基
準値と比較した値により前記開閉素子の動作を制
御して、一定化直流電流を得る中点直接接地型定
電流回路において、 前記二つの二次側巻線の他方端と接地点間に電
流変成器を挿入し、該電流変成器の一次側・二次
側各巻線は互いに同方向巻線で形成したこと を特徴とする中点直接接地型定電流回路。[Claims] 1. A switching element is inserted into the primary winding of the transformer, one end of the two secondary windings of the transformer is connected to the load via each rectifier circuit, and the other end is connected to the load via each rectifier circuit. The end is directly grounded at the center point, the switching element switches on and off the DC current, the obtained AC current is stepped up by the transformer, and the potential difference between the grounding point and one end of each winding is set as a reference value. In a center-point directly grounded constant current circuit that controls the operation of the switching element based on the compared values and obtains a constant direct current, a current transformer is installed between the other ends of the two secondary windings and the ground point. 1. A center point directly grounded constant current circuit characterized in that the primary and secondary windings of the current transformer are formed with windings in the same direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1308984A JPS60157615A (en) | 1984-01-27 | 1984-01-27 | Neutral point direct grounding type constant current circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1308984A JPS60157615A (en) | 1984-01-27 | 1984-01-27 | Neutral point direct grounding type constant current circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60157615A JPS60157615A (en) | 1985-08-17 |
| JPH0479231B2 true JPH0479231B2 (en) | 1992-12-15 |
Family
ID=11823430
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1308984A Granted JPS60157615A (en) | 1984-01-27 | 1984-01-27 | Neutral point direct grounding type constant current circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60157615A (en) |
Families Citing this family (1)
| 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 |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5173226A (en) * | 1974-12-21 | 1976-06-24 | Sanken Electric Co Ltd | Fukusuno shutsuryokukairoo jusuru dengensochi |
| JPS5819921A (en) * | 1981-07-29 | 1983-02-05 | Tdk Corp | Multioutput switching power source |
| JPS626419A (en) * | 1985-06-29 | 1987-01-13 | Toshiba Corp | Magnetic head |
-
1984
- 1984-01-27 JP JP1308984A patent/JPS60157615A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60157615A (en) | 1985-08-17 |
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