JP3235705B2 - Switching power supply - Google Patents
Switching power supplyInfo
- Publication number
- JP3235705B2 JP3235705B2 JP09041295A JP9041295A JP3235705B2 JP 3235705 B2 JP3235705 B2 JP 3235705B2 JP 09041295 A JP09041295 A JP 09041295A JP 9041295 A JP9041295 A JP 9041295A JP 3235705 B2 JP3235705 B2 JP 3235705B2
- Authority
- JP
- Japan
- Prior art keywords
- power supply
- switching power
- current
- parallel
- 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 - Fee Related
Links
Landscapes
- Supply And Distribution Of Alternating Current (AREA)
- Dc-Dc Converters (AREA)
Description
【０００１】[0001]
【発明の属する分野】フォワ−ドコンバ−タ方式のスイ
ッチング電源の並列運転に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a parallel operation of a switching power supply of a forward converter type.
【０００２】[0002]
【従来の技術】従来のスイッチング電源装置において大
容量化をはかる場合、トランス、平滑チョ−ク、スイッ
チ素子等の小型軽量化をはかるために、複数台のフォワ
−ドコンバ−タの入出力を並列接続する方法がとられて
いる。2. Description of the Related Art In order to increase the capacity of a conventional switching power supply, the inputs and outputs of a plurality of forward converters are connected in parallel in order to reduce the size and weight of transformers, smoothing chokes, switch elements, and the like. The method of connection is taken.
【０００３】図１にその代表例を示す。図において２、
１２はスイッチ素子、３、１３は主トランス、４、１
４、５、１５は整流素子、６、１６は平滑チョ−ク、
７、１７はコンデンサである。FIG. 1 shows a typical example. In the figure,
12 is a switch element, 3 and 13 are main transformers, 4, 1
4, 5 and 15 are rectifying elements, 6 and 16 are smoothing chokes,
Reference numerals 7 and 17 denote capacitors.
【０００４】このように２組以上のフォワ−ドコンバ−
タが入力電源１に並列接続され、それぞれ高周波変換し
平滑された直流出力が並列接続されたスイッチング電源
において、各々のフォワ−ドコンバ−タの回路定数が等
しく、かつスイッチ素子の動作が同じであれば、各コン
バ−タの負荷分担は均等化する。As described above, two or more sets of forward converters are used.
In a switching power supply in which the converters are connected in parallel to the input power supply 1 and the DC outputs subjected to high-frequency conversion and smoothing are connected in parallel, the circuit constants of the respective forward converters are equal and the operation of the switch elements is the same. In this case, the load sharing of each converter is equalized.
【０００５】[0005]
（２） しかし現実には回路定数やスイッチ素子の動作に若干の
ずれがあるため、負荷分担にばらつきを生じる。負荷分
担がばらつくと負荷分担が均等化しているしている時に
比べ、過分に負荷を背負った方のフォワ−ドコンバ−タ
の各素子に過大な電流が流れ、思わぬ素子の発熱やサ−
ジ電圧の発生、ノイズの増大等が起こる危険性がある。(2) However, in reality, there is a slight shift in the circuit constants and the operation of the switch elements, so that the load sharing varies. When the load distribution varies, an excessive current flows to each element of the forward converter that has excessively loaded the load, compared to when the load distribution is equalized.
There is a danger that a voltage may be generated and noise may increase.
【０００６】[0006]
【発明の目的】本発明は上記複数のフォワ−ドコンバ−
タの並列接続時における負荷分担の不平衡を、安価でか
つ電力ロスの少ない回路部品により均等化することを目
的とする。SUMMARY OF THE INVENTION The present invention relates to a plurality of forward converters.
It is an object of the present invention to equalize the unbalance of load sharing at the time of parallel connection of the data by using inexpensive and low power loss circuit components.
【０００７】[0007]
【課題を解決するための手段】本発明は、スイッチ素子
（２，１２）、主トランス（３，１３）、整流素子
（４，５，１４，１５）、平滑チョーク（６，１６）、
コンデンサ（７，１７）より成るフォワードコンバータ
を、直流電源に同一位相で複数台並列接続して共通の負
荷に給電するようにしたスイッチング電源において、該
各フォワードコンバータの各主トランスの１次巻線と直
列にカレントトランス（８，１８）の１次巻線を接続
し、且つ該カレントトランスの各２次巻線を電流方向が
一致するように同極に直列接続したことを特徴とするス
イッチング電源。According to the present invention, a switching element (2, 12), a main transformer (3, 13), a rectifying element (4, 5, 14, 15), a smoothing choke (6, 16),
In a switching power supply in which a plurality of forward converters composed of capacitors (7, 17) are connected in parallel to a DC power supply at the same phase to supply power to a common load, primary windings of main transformers of the respective forward converters are provided. And a secondary winding of the current transformer (8, 18) is connected in series with the secondary winding of the current transformer, and respective secondary windings of the current transformer are connected in series with the same polarity so that the current directions match. .
【０００８】[0008]
【実施例】図２は本発明の実施例である。入出力を並列
接続した各々のフォワ−ドコンバ−タの主トランス３及
び１３と直列に、カレントトランス８及び１８の１次巻
線を接続し、各々のカレントトランス８及び１８の２次
巻線を電流方向が一致するような極性、すなわち巻線の
極性が一致する方向で直列接続する。FIG. 2 shows an embodiment of the present invention. The primary windings of the current transformers 8 and 18 are connected in series with the main transformers 3 and 13 of each forward converter whose input and output are connected in parallel, and the secondary windings of the current transformers 8 and 18 are connected. They are connected in series in such a manner that the current directions match, that is, the windings have the same polarity.
【０００９】つまり全てのカレントトランスの２次巻線
電流は同一となる。また全てのカレントトランスの１次
巻線と２次巻線の巻数比も同一である。これにより全て
のカレントトランスの１次巻線の電流、すなわち主トラ
ンスの１次巻線電流は同一になろうとする。That is, the secondary winding currents of all the current transformers are the same. Also, the turn ratio of the primary winding and the secondary winding of all the current transformers is the same. As a result, the currents of the primary windings of all the current transformers, that is, the primary winding currents of the main transformers tend to be the same.
【００１０】 （３） トランスの１次巻線の電流値はそのままコンバ−タの負
荷電流に比例するため結果的に各コンバ−タの負荷分担
は均等化する。各コンバ−タの負荷分担が均等化するこ
とで、負荷のかたよりによる素子の異常な発熱やサ−ジ
電圧、ノイズ等を引き起こすことなしに、効率良く電力
を負荷側に変換することが可能となる。(3) The current value of the primary winding of the transformer is directly proportional to the load current of the converter, so that the load sharing of each converter is equalized. By equalizing the load sharing of each converter, it is possible to efficiently convert electric power to the load side without causing abnormal heat generation, surge voltage, noise, etc. of the element due to the load. Become.
【００１１】[0011]
【発明の効果】以上のように並列接続された従来形のフ
ォワ−ドコンバ−タの主トランスと直列にカレントトラ
ンスを挿入しただけの簡単な構成でありながら、各コン
バ−タの負荷分担を均等化することが可能となる。As described above, although the current transformer is simply inserted in series with the main transformer of the conventional forward converter connected in parallel, the load sharing of each converter is equalized. Can be realized.
【図１】従来のフォワ−ドコンバ−タ並列回路FIG. 1 is a conventional forward converter parallel circuit.
【図２】本発明のフォワ−ドコンバ−タ並列回路の一実
施例FIG. 2 is an embodiment of a forward converter parallel circuit of the present invention.
１ 入力電源 ２、１２ スイッチ素子 ３、１３ 主トランス ４、５、１４、１５ 整流素子 ６、１６ 平滑チョ−ク ７、１７ コンデンサ ８、１８ カレントトランス DESCRIPTION OF SYMBOLS 1 Input power supply 2, 12 Switch element 3, 13 Main transformer 4, 5, 14, 15 Rectifier element 6, 16 Smooth choke 7, 17 Capacitor 8, 18 Current transformer
Claims (1)
平滑チョーク、コンデンサより成るフォワードコンバー
タを、直流電源に同一位相で複数台並列接続して共通の
負荷に給電するようにしたスイッチング電源において、
該各フォワードコンバータの各主トランスの１次巻線と
直列にカレントトランスの１次巻線を接続し、且つ該カ
レントトランスの各２次巻線を電流方向が一致するよう
に同極に直列接続したことを特徴とするスイッチング電
源。A switching element, a main transformer, a rectifying element,
In a switching power supply in which a plurality of forward converters composed of a smoothing choke and a capacitor are connected in parallel to a DC power supply in the same phase to supply power to a common load,
A primary winding of a current transformer is connected in series with a primary winding of each main transformer of each forward converter, and each secondary winding of the current transformer is connected in series with the same polarity so that the current directions match. A switching power supply characterized in that:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP09041295A JP3235705B2 (en) | 1995-03-23 | 1995-03-23 | Switching power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP09041295A JP3235705B2 (en) | 1995-03-23 | 1995-03-23 | Switching power supply |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08266051A JPH08266051A (en) | 1996-10-11 |
| JP3235705B2 true JP3235705B2 (en) | 2001-12-04 |
Family
ID=13997884
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP09041295A Expired - Fee Related JP3235705B2 (en) | 1995-03-23 | 1995-03-23 | Switching power supply |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3235705B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6370047B2 (en) * | 2000-03-10 | 2002-04-09 | Power-One, Inc. | Dual input range power supply using two series or parallel connected converter sections with automatic power balancing |
| CN104836447A (en) * | 2015-06-09 | 2015-08-12 | 航天长峰朝阳电源有限公司 | Large power parallel double-switch forward DC/DC power supply module |
-
1995
- 1995-03-23 JP JP09041295A patent/JP3235705B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH08266051A (en) | 1996-10-11 |
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