JPH10178775A - Switching power supply - Google Patents
Switching power supplyInfo
- Publication number
- JPH10178775A JPH10178775A JP8353458A JP35345896A JPH10178775A JP H10178775 A JPH10178775 A JP H10178775A JP 8353458 A JP8353458 A JP 8353458A JP 35345896 A JP35345896 A JP 35345896A JP H10178775 A JPH10178775 A JP H10178775A
- Authority
- JP
- Japan
- Prior art keywords
- switch element
- transformer
- power supply
- winding
- diode
- 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.)
- Granted
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
Landscapes
- Dc-Dc Converters (AREA)
- Rectifiers (AREA)
Abstract
Description
【０００１】[0001]
【本発明の属する分野】本発明は、スイッチング電源の
力率改善回路の高効率化に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to improving the efficiency of a power factor improving circuit for a switching power supply.
【０００２】[0002]
【従来の技術】図４は従来の力率改善回路付きスイッチ
ング電源の一実施例である。図において、１は商用交流
電源、２、３，４，５は整流用ダイオード、６は力率改
善回路、例えば、アクティブフィルタ、７は第１のトラ
ンス、８は第１のトランスの１次 （２） 巻き線、９は第１のトランスの２次巻き線、１０は第１
のスイッチ素子、１１は整流ダイオード、１２はフライ
ホイールダイオード、１３はチョークコイル、１４は平
滑コンデンサ、１５は負荷、１６は出力電圧検出用誤差
増幅器、１７は基準電圧、１８は発振器、１９は駆動回
路である。この回路は、既知の回路なので、詳しい動作
説明は省略する。この方式は、力率を改善するために、
力率改善回路６を整流回路とＤＣ−ＤＣコンバータの間
に挿入したものである。力率改善回路は、それ単体でも
昇圧チョパー型のスイッチング電源と同じ構成をしてお
り、実質的にスイッチング電源を２つ直列につないだこ
とになり、力率は改善できるものの、効率の低下は免れ
ない。2. Description of the Related Art FIG. 4 shows an embodiment of a conventional switching power supply with a power factor improving circuit. In the figure, 1 is a commercial AC power supply, 2, 3, 4, and 5 are rectifying diodes, 6 is a power factor improving circuit, for example, an active filter, 7 is a first transformer, and 8 is a primary transformer of the first transformer. 2) winding, 9 is the secondary winding of the first transformer, 10 is the first winding
Switch element, 11 is a rectifier diode, 12 is a flywheel diode, 13 is a choke coil, 14 is a smoothing capacitor, 15 is a load, 16 is an error amplifier for detecting output voltage, 17 is a reference voltage, 18 is an oscillator, and 19 is a drive. Circuit. Since this circuit is a known circuit, a detailed description of the operation is omitted. This method, to improve the power factor,
The power factor improving circuit 6 is inserted between a rectifier circuit and a DC-DC converter. The power factor improvement circuit has the same configuration as a boost chopper type switching power supply by itself, and in effect, two switching power supplies are connected in series. Although the power factor can be improved, the efficiency is reduced. I can't escape.
【０００３】[0003]
【発明が解決しようとする課題】本発明は、上記問題を
解決するために力率改善付きスイッチング電源の高効率
化を目的とするものである。SUMMARY OF THE INVENTION An object of the present invention is to improve the efficiency of a switching power supply with a power factor improvement in order to solve the above problems.
【０００４】[0004]
【本発明の実施形態】図１に本発明の一実施例を示す。
従来の回路と同じところは同じ番号で示してある。２１
は第２のトランス、２２は第１のトランスの１次巻き
線、２３は第１のトランスの２次巻き線、２４は第１の
スイッチ素子、２４ａは第１のスイッチ素子の寄生ダイ
オード、２５は第２のスイッチ素子、２５ａは第２のス
イッチ素子の寄生ダイオードである。２６は整流ダイオ
ード、第１のスイッチ素子２４と、第２のスイッチ素子
２５には、駆動回路１９により同じオンオフ信号が加え
られる。また、第１のトランス７と第２のトランス２１
のそれぞれの巻き線の巻き始めは、図１中でドットを打
って示してある。FIG. 1 shows an embodiment of the present invention.
The same parts as those of the conventional circuit are indicated by the same numbers. 21
Is a second winding of the first transformer, 22 is a secondary winding of the first transformer, 24 is a first switch element, 24a is a parasitic diode of the first switch element, 25 Is a second switch element, and 25a is a parasitic diode of the second switch element. 26 is a rectifier diode, and the same ON / OFF signal is applied to the first switch element 24 and the second switch element 25 by the drive circuit 19. The first transformer 7 and the second transformer 21
The start of winding of each winding is indicated by dots in FIG.
【０００５】即ち、商用電源１と並列に第１のコンデン
サ２０を接続し、前記第１のコンデンサ２０と並列に第
１のトランス７の１次巻き線８の巻き始めを接続し、前
記第１のトランス７の１次巻き線８の巻き終わりに第２
のトランス２１の１次巻き線 （３） ２２の巻きはじめを接続し、前記第２のトランス２１の
１次巻き線２２の巻き終わりに、第１のスイッチ素子２
４を接続し、前記第１のスイッチ素子２４の他端に、第
２のスイッチ素子２５を接続したことからなる直列回路
が接続され、また、前記第１のスイッチ素子２４と並列
に正の半周期で逆方向となるように第１のスイッチ素子
２４の寄生ダイオードである第１のダイオード２４ａを
接続し、前記第２のスイッチ素子２５と並列に負の半周
期で逆方向となるように第２のスイッチ素子２５の寄生
ダイオードである第２のダイオード２５ａを接続し、前
記第１のトランス７の２次巻き線９の巻き始めに第３の
ダイオード１１のアノードを接続する。That is, a first capacitor 20 is connected in parallel with the commercial power supply 1, and the start of the primary winding 8 of the first transformer 7 is connected in parallel with the first capacitor 20, At the end of the primary winding 8 of the transformer 7
(3) Connect the start of the winding of the primary winding 22 of the transformer 21, and at the end of the winding of the primary winding 22 of the second transformer 21,
4 is connected, and the other end of the first switch element 24 is connected to a series circuit formed by connecting a second switch element 25. In addition, a positive half is connected in parallel with the first switch element 24. A first diode 24a, which is a parasitic diode of the first switch element 24, is connected so as to be in the opposite direction with the cycle, and the first diode 24a is connected in parallel with the second switch element 25 so as to be in the reverse direction with a negative half cycle. The second diode 25a, which is a parasitic diode of the second switch element 25, is connected, and the anode of the third diode 11 is connected to the beginning of the secondary winding 9 of the first transformer 7.
【０００６】又、前記第１のトランス７の２次巻き線９
の巻き終わりに第２のコンデンサ１４を接続し、また、
前記第２のコンデンサ１４の他端に前記第３のダイオー
ド１１のカソードを接続し、前記第２のコンデンサ１４
と並列に負荷１５を接続し、前記第２のトランス２１の
２次巻き線２３の巻き終わりに第４のダイオード２６の
アノードを接続し、前記第４のダイオード２６を前記第
３のダイオード１１のカソードに前記第４のダイオード
２６のカソードを接続し、前記第２のトランス２１の２
次巻き線２３の巻き始めを前記前記第１のトランス７の
２次巻き線９の巻き終わりに接続する。The secondary winding 9 of the first transformer 7
At the end of the winding of the second capacitor 14,
The other end of the second capacitor 14 is connected to the cathode of the third diode 11, and the second capacitor 14
A load 15 is connected in parallel with the second diode 21. An anode of a fourth diode 26 is connected at the end of the winding of the secondary winding 23 of the second transformer 21, and the fourth diode 26 is connected to the third diode 11 The cathode of the fourth diode 26 is connected to the cathode, and the cathode of the second
The start of the next winding 23 is connected to the end of the secondary winding 9 of the first transformer 7.
【０００７】次に、この回路の動作を図３を使って説明
する。図において、（ａ）は入力の商用電圧波形、
（ｂ）は第１のスイッチ素子２４と第２のスイッチ素子
２５の駆動信号、（ｃ）は第１のトランス７の１次巻き
線８と第２のトランス２１の１次巻き線２２の電流波形
である。まず、商用電源の正の半周期の動作について説
明する。図３中のＡの期間に駆動回路１９よりオンの信
号が第１のスイッチ素子２４と第２のスイッチ素子２５
に加えられると、それぞれのスイッチ素子がターンオン
する。すると電流は、商用電源１―第１のトランス７の
１次巻き線８―第２のトランス２１の１次巻き線２ （４） ２―第１のスイッチ素子２４―第２のスイッチ素子２５
とその寄生ダイオード２４ａというルートで流れる。Next, the operation of this circuit will be described with reference to FIG. In the figure, (a) is the input commercial voltage waveform,
(B) is a drive signal of the first switch element 24 and the second switch element 25, and (c) is a current of the primary winding 8 of the first transformer 7 and the primary winding 22 of the second transformer 21. It is a waveform. First, the operation of the commercial power supply in the positive half cycle will be described. During the period A in FIG. 3, the drive circuit 19 outputs an ON signal to the first switch element 24 and the second switch element 25.
, Each switch element is turned on. Then, the current is changed from the commercial power supply 1-the primary winding 8 of the first transformer 7-the primary winding 2 of the second transformer 21 (4) 2-the first switch element 24-the second switch element 25
And the parasitic diode 24a.
【０００８】この時、第１のトランス７の１次巻き線８
には、第１のトランス７の２次巻き線９との巻き数比に
よって決まる電圧ｎＶｏよりも低い電圧が印可されてい
るため、２次側にはエネルギの伝達は行われない。次
に、駆動回路１９よりオフの信号が第１のスイッチ素子
２４と第２のスイッチ素子２５に加えられると、第１ス
イッチ素子２４と第２のスイッチ素子２５はそれぞれタ
ーンオフする。そして、電流は、第２のトランス２１の
２次巻き線２３―整流ダイオード２６―負荷１５のルー
トで電流が流れて、負荷に電力が供給される。At this time, the primary winding 8 of the first transformer 7
Is applied with a voltage lower than the voltage nVo determined by the ratio of the number of turns of the first transformer 7 to the secondary winding 9, so that energy is not transmitted to the secondary side. Next, when an off signal is applied from the drive circuit 19 to the first switch element 24 and the second switch element 25, the first switch element 24 and the second switch element 25 are turned off. Then, the current flows through the route of the secondary winding 23 of the second transformer 21, the rectifier diode 26, and the load 15, and power is supplied to the load.
【０００９】次に、図３中Ｂの期間に駆動回路１９より
オンの信号が第１のスイッチ素子２４と第２のスイッチ
素子２５に加えられると、それぞれのスイッチ素子がタ
ーンオンする。すると電流は、商用電源１―第１のトラ
ンス７の１次巻き線８―第２のトランス２１の１次巻き
線２２―第１のスイッチ素子２４―第２のスイッチ素子
２５とその寄生ダイオード２４ａというルートと、第１
のトランスの２次巻き線９―整流ダイオード１１―負荷
１５というルートで流れる。次に、駆動回路１９よりオ
フの信号が第１のスイッチ素子２４と第２のスイッチ素
子２５に加えられると、第１スイッチ素子２４と第２の
スイッチ素子２５はそれぞれターンオフする。そして、
電流は、第２のトランス２１の２次巻き線２３―整流ダ
イオード２６―負荷１５のルートで電流が流れて、負荷
に電力が供給される。Next, when an ON signal is applied from the drive circuit 19 to the first switch element 24 and the second switch element 25 during the period B in FIG. 3, each switch element is turned on. Then, the current is changed from the commercial power supply 1-the primary winding 8 of the first transformer 7-the primary winding 22 of the second transformer 21-the first switch element 24-the second switch element 25 and its parasitic diode 24a. Route and the first
Flows through a route of secondary winding 9 of transformer, rectifier diode 11 and load 15. Next, when an off signal is applied from the drive circuit 19 to the first switch element 24 and the second switch element 25, the first switch element 24 and the second switch element 25 are turned off. And
The current flows through the route of the secondary winding 23 of the second transformer 21, the rectifier diode 26, and the load 15, and power is supplied to the load.
【００１０】次に図３中Ｃの期間の動作について説明す
る。この期間の動作は、期間Ａの動作と同じである。Next, the operation in the period C in FIG. 3 will be described. The operation in this period is the same as the operation in period A.
【００１１】次に、図３中Ｄ、Ｅ、Ｆの期間の動作につ
いて説明する。これらの期間の動作は、第１のトランス
７と第２のトランス２１、第１のスイッチ素子２４と第
２のスイッチ素子２５のそれぞれが相対的な役割を行っ
ていること以外は図３中のＡ 、
（５） Ｂ、Ｃの期間の動作と同じである。Next, the operation during periods D, E and F in FIG. 3 will be described. The operation in these periods is the same as that in FIG. 3 except that the first transformer 7 and the second transformer 21 and the first switch element 24 and the second switch element 25 each perform a relative role. A,
(5) The operation is the same as the operation in the periods B and C.
【００１２】前述の動作により第１のトランス７は正の
半周期でフォワード巻き線として機能し、負の半周期で
チョークコイルとしての機能を果たす。また、第２のト
ランス２１は正の半周期でチョークコイルとして機能
し、負の半周期でフォワード巻き線としての機能を果た
す。そして、入力の商用電源からスイッチング電源に供
給される電流は、図３の（ｃ）の中で点線で示されたよ
うな入力電圧と相似な波形となり力率が改善される。ま
た、図４に示した従来の回路では、入力電流を整流する
ときに２つのダイオードを使用していたが、この方式で
は１つのダイオードしか使用しないために効率の改善を
行うことができる。By the operation described above, the first transformer 7 functions as a forward winding in a positive half cycle, and functions as a choke coil in a negative half cycle. The second transformer 21 functions as a choke coil in the positive half cycle, and functions as a forward winding in the negative half cycle. The current supplied from the input commercial power supply to the switching power supply has a waveform similar to the input voltage shown by the dotted line in FIG. 3C, and the power factor is improved. Further, in the conventional circuit shown in FIG. 4, two diodes are used when rectifying the input current. However, in this method, since only one diode is used, the efficiency can be improved.
【００１３】図２は本発明の第２の実施例である。図２
の回路の回路構成と動作について説明する。図２におい
て、図１で説明したものと同じものは、同じ符号を付け
てある。FIG. 2 shows a second embodiment of the present invention. FIG.
The circuit configuration and operation of this circuit will be described. In FIG. 2, the same components as those described in FIG. 1 are denoted by the same reference numerals.
【００１４】図２において、発信器１８は誤差増幅器１
６の出力を第１の入力とし、入力電流検出回路２７の出
力を第２の入力として、直流出力電圧が基準電圧１７よ
りも大きくなったときには、第１のスイッチ素子２４と
第２のスイッチ素子２５のオン時間を短くし、直流出力
電圧が基準電圧１７よりも小さくなったときには第１の
スイッチ素子２４と第２のスイッチ素子２５のオン時間
を長くするようなパルスを発生して、直流出力電圧を安
定化するとともに、入力電流の波形が入力電圧波形に相
似になるように、スイッチ素子のオンオフ時間を制御す
る。In FIG. 2, the transmitter 18 is connected to the error amplifier 1.
6 as a first input and the output of the input current detection circuit 27 as a second input, when the DC output voltage becomes higher than the reference voltage 17, the first switch element 24 and the second switch element When the DC output voltage is lower than the reference voltage 17, a pulse is generated to extend the ON time of the first switch element 24 and the second switch element 25, and the DC output voltage is reduced. The ON / OFF time of the switch element is controlled so that the voltage is stabilized and the waveform of the input current is similar to the input voltage waveform.
【００１５】図２のような構成にすることで、１次側の
整流に伴う損失を更に低減することが出来る。その結
果、従来の力率改善型スイッチング電源よりも、力率及
び効率を改善することが出来る。With the configuration as shown in FIG. 2, the loss associated with rectification on the primary side can be further reduced. As a result, the power factor and the efficiency can be improved as compared with the conventional power factor improving switching power supply.
【００１６】[0016]
（６） 本発明によって、従来よりも高効率な力率改善型スイッ
チング電源が実現できる。また、部品点数の削減によっ
て、結果的に小型、低コスト化された力率改善付きスイ
ッチング電源が実現できる。(6) According to the present invention, it is possible to realize a power factor correction type switching power supply with higher efficiency than before. Further, by reducing the number of parts, a small and low-cost switching power supply with improved power factor can be realized.
【図１】本発明の力率改善型スイッチング電源の一実施
例回路図。FIG. 1 is a circuit diagram of an embodiment of a power factor improving type switching power supply according to the present invention.
【図２】本発明の力率改善型スイッチング電源の２つ目
の実施例回路図FIG. 2 is a circuit diagram of a second embodiment of a power factor improving type switching power supply according to the present invention.
【図３】本発明のスイッチング電源の各部動作波形。FIG. 3 is an operation waveform of each part of the switching power supply of the present invention.
【図４】従来の力率改善型スイッチング電源の一実施例
回路図。FIG. 4 is a circuit diagram of an embodiment of a conventional power factor improving switching power supply.
１ 交流電源 ２ 整流ダイオード ３ 整流ダイオード ４ 整流ダイオード ５ 整流ダイオード ６ 力率改善回路 ７ 第１のトランス ８ 第１のトランスの１次巻き線 ９ 第１のトランスの１次巻き線 １０ 主スイッチ素子 １１ 整流用ダイオード １２ フライホイールダイオード １３ チョークコイル １４ 平滑コンデンサ （７） １５ 負荷 １６ 誤差増幅器 １７ 基準電圧 １８ 発振器 １９ 駆動回路 ２０ コンデンサ ２１ 第２のトランス ２２ 第２のトランスの１次巻き線 ２３ 第２のトランスの２次巻き線 ２４ 第１のスイッチ素子 ２４ａ 第１のスイッチ素子の寄生ダイオード ２５ 第２のスイッチ素子 ２５ａ 第２のスイッチ素子の寄生ダイオード ２６ 整流ダイオード ２７ 電流検出回路 DESCRIPTION OF SYMBOLS 1 AC power supply 2 Rectifier diode 3 Rectifier diode 4 Rectifier diode 5 Rectifier diode 6 Power factor improvement circuit 7 First transformer 8 Primary winding of first transformer 9 Primary winding of first transformer 10 Main switch element 11 Rectifier diode 12 Flywheel diode 13 Choke coil 14 Smoothing capacitor (7) 15 Load 16 Error amplifier 17 Reference voltage 18 Oscillator 19 Drive circuit 20 Capacitor 21 Second transformer 22 Primary winding of second transformer 23 Second Secondary winding of transformer 24 First switch element 24a Parasitic diode of first switch element 25 Second switch element 25a Parasitic diode of second switch element 26 Rectifier diode 27 Current detection circuit
Claims (3)
ワード巻き線として機能し、負の半周期でチョークコイ
ルとして機能する第１のトランス７と、正の半周期でチ
ョークコイルとして機能し、負の半周期でフォワード巻
き線として機能する第２のトランス２１と、第１のスイ
ッチ素子２４と、第２のスイッチ素子２５からなる直列
回路を接続し、それぞれのトランスの２次巻き線９、２
３に整流回路を接続すると共に、前記第１及び第２のス
イッチ素子に逆極性の同方に夫々ダイオード２４ａ及び
２５ａとを並列接続し、且つ、前記第１及び第２のトラ
ンスの２次巻線を夫々整流ダイオード１１及び２６を介
して並列接続して、負荷１５に供給するようにしたこと
を特徴とするスイッチング電源。1. A first transformer 7 which functions as a forward winding in a positive half cycle and functions as a choke coil in a negative half cycle in parallel with the commercial power supply 1, and functions as a choke coil in a positive half cycle. , A series circuit including a second transformer 21 functioning as a forward winding with a negative half cycle, a first switch element 24, and a second switch element 25 is connected, and the secondary winding 9 of each transformer is connected. , 2
3, a rectifier circuit is connected, diodes 24a and 25a are connected in parallel to the first and second switch elements in opposite directions, respectively, and secondary windings of the first and second transformers are connected. Are connected in parallel via rectifier diodes 11 and 26, respectively, and supplied to the load 15.
記第１スイッチ素子２４及び、第２スイッチ素子２５の
寄生ダイオードであることを特徴とする請求項１のスイ
ッチング電源。2. The switching power supply according to claim 1, wherein the diodes 24a and 25a are parasitic diodes of the first switch element 24 and the second switch element 25.
イッチ素子２５のスイッチング周波数が商用周波数より
も高いことを特徴とする請求項１、または請求項２記載
のスイッチング電源。3. The switching power supply according to claim 1, wherein the switching frequency of the first switch element and the second switch element is higher than a commercial frequency.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP35345896A JP3478693B2 (en) | 1996-12-17 | 1996-12-17 | Switching power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP35345896A JP3478693B2 (en) | 1996-12-17 | 1996-12-17 | Switching power supply |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH10178775A true JPH10178775A (en) | 1998-06-30 |
| JP3478693B2 JP3478693B2 (en) | 2003-12-15 |
Family
ID=18430991
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP35345896A Expired - Fee Related JP3478693B2 (en) | 1996-12-17 | 1996-12-17 | Switching power supply |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3478693B2 (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002315338A (en) * | 2001-04-05 | 2002-10-25 | Shindengen Electric Mfg Co Ltd | Switching power supply |
| JP2002330582A (en) * | 2001-05-08 | 2002-11-15 | Shindengen Electric Mfg Co Ltd | Switching power supply device |
| JP2002369524A (en) * | 2001-06-01 | 2002-12-20 | Shindengen Electric Mfg Co Ltd | Switching power supply unit |
| JP2003037978A (en) * | 2001-07-24 | 2003-02-07 | Shindengen Electric Mfg Co Ltd | Switching power device |
| CN102064709A (en) * | 2010-12-30 | 2011-05-18 | 南京航空航天大学 | Two-path two-transistor forward DC (Direct Current) converter with serially-connected transformers |
| US8279629B2 (en) | 2009-07-29 | 2012-10-02 | Tdk Corporation | Switching power supply |
-
1996
- 1996-12-17 JP JP35345896A patent/JP3478693B2/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002315338A (en) * | 2001-04-05 | 2002-10-25 | Shindengen Electric Mfg Co Ltd | Switching power supply |
| JP2002330582A (en) * | 2001-05-08 | 2002-11-15 | Shindengen Electric Mfg Co Ltd | Switching power supply device |
| JP4716598B2 (en) * | 2001-05-08 | 2011-07-06 | 新電元工業株式会社 | Switching power supply |
| JP2002369524A (en) * | 2001-06-01 | 2002-12-20 | Shindengen Electric Mfg Co Ltd | Switching power supply unit |
| JP4703037B2 (en) * | 2001-06-01 | 2011-06-15 | 新電元工業株式会社 | Switching power supply |
| JP2003037978A (en) * | 2001-07-24 | 2003-02-07 | Shindengen Electric Mfg Co Ltd | Switching power device |
| JP4716613B2 (en) * | 2001-07-24 | 2011-07-06 | 新電元工業株式会社 | Switching power supply |
| US8279629B2 (en) | 2009-07-29 | 2012-10-02 | Tdk Corporation | Switching power supply |
| CN102064709A (en) * | 2010-12-30 | 2011-05-18 | 南京航空航天大学 | Two-path two-transistor forward DC (Direct Current) converter with serially-connected transformers |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3478693B2 (en) | 2003-12-15 |
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