JPH03256561A - Switching regulator - Google Patents

Switching regulator

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Publication number
JPH03256561A
JPH03256561A JP5302790A JP5302790A JPH03256561A JP H03256561 A JPH03256561 A JP H03256561A JP 5302790 A JP5302790 A JP 5302790A JP 5302790 A JP5302790 A JP 5302790A JP H03256561 A JPH03256561 A JP H03256561A
Authority
JP
Japan
Prior art keywords
output
transformer
current detection
winding
power
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.)
Pending
Application number
JP5302790A
Other languages
Japanese (ja)
Inventor
Tetsuji Hiragama
平鍋　哲治
Koji Kuwabara
桑原　厚二
Kazuo Watanabe
和夫 渡辺
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujitsu Ltd
Original Assignee
Fujitsu Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP5302790A priority Critical patent/JPH03256561A/en
Publication of JPH03256561A publication Critical patent/JPH03256561A/en
Pending legal-status Critical Current

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Abstract

PURPOSE:To mass produce standardized power supply boards by employing two windings having same number of turns in the secondary winding of a transformer at a power supply converting section and then connecting the secondary winding to a current detection transformer. CONSTITUTION:In case of parallel connection, an impedance matching circuit in a current detection transformer 14 for balancing the currents flowing through the secondary windings II, III of a transformer T matches the impedances so that the voltages across the primary and secondary windings IV, V of the current detection transformer 14 will be same. Consequently, even if automatic voltage regulation is carried out through feedback from one output side to a voltage control section 13, a balanced and stabilized output can be obtained on the secondary. In case of series connection, same current flows through the current detection transformer 14 at all times and balanced currents flow through respective power supplies connected in series thus producing a stabilized output.

Description

【発明の詳細な説明】 〔概　要〕 出力容量が同一で２種以上の出力電圧、出力電流に対応
するスイッチング・レギュレータに関し、１個のモジュ
ール構成で出力電圧を直列叉は並列に組合わせて、出力
電圧、容量にフレキシブルに対応できることを目的とし
、 スイッチング１−ランジスタのオンオフにより直流電源
を変換する電源変換部と、該電源変換部の出力を整流平
滑化する整流平滑部と、該出力電圧によりスイッチング
トランジスタのオンオフを制御する電圧制御部とを有し
、 該電源変換部の出力側と該整流平滑部との間に同一捲線
比の捲線を有する電流検出トランスを備え、該電源変換
部のトランスの２次側捲線を同一捲線数の２つの捲線と
し、電源変換部のトランスの一方の２次側１４！線の一
側と電流検出トランスの１次側捲線の一側とを接続し、
電源変換部のトランスの他方の２次側捲線の＋側と電流
検出トランスの２次側捲線の一側とを接続し、該電流検
出トランスの１次側捲線の＋側と２次側捲線の＋側とを
整流平滑部を経由して２電源出力端子のそれぞれ片側の
端子とするように構成する。[Detailed Description of the Invention] [Summary] Regarding a switching regulator that has the same output capacity and can handle two or more types of output voltages and output currents, it is possible to combine the output voltages in series or in parallel in one module configuration. Switching 1 - A power converter that converts DC power by turning on and off a transistor, a rectifier and smoother that rectifies and smoothes the output of the power converter, and a rectifier and smoother that converts the output voltage and output voltage. a voltage control section that controls on/off of the switching transistor, and a current detection transformer having a winding with the same winding ratio between the output side of the power conversion section and the rectifying and smoothing section; The secondary winding of the transformer has two windings with the same number of windings, and one of the secondary windings of the transformer in the power converter section 14! Connect one side of the wire to one side of the primary winding of the current detection transformer,
Connect the + side of the other secondary winding of the transformer of the power converter and one side of the secondary winding of the current detection transformer, and connect the + side of the primary winding of the current detection transformer with the + side of the secondary winding of the current detection transformer. The + side is configured to be connected to one side of the two power output terminals via a rectifying and smoothing section.

〔産業上の利用分野〕[Industrial application field]

本発明は、出力容量が同一で２種以上の出力電圧、出力
電流に対応するスイッチング・レギュレータに関する。The present invention relates to a switching regulator that has the same output capacity and can handle two or more types of output voltages and output currents.

交換機や伝送機器等に使用される通信機器の電源には、
Ｄ　Ｃ／Ｄ　Ｃコンバータ等の直流人力／直流出力の電
源回路が一般的に使用されているが、これらの電源は入
力電圧４８Ｖの電源を出力電圧上５■或いは±１２Ｖに
変換して通信機器の電源用として使用している０例えば
通信機器の電源定格の一例として、入力４８Ｖ、出力ｓ
ｖ、ｉＨ流容量２〜３Ａ、出力電圧変動±５％以内に抑
えて、小容量交換機の電源として採用されている。これ
らの電源は電源盤の標準化、量産化に対応するため、素
子のモジュール化が図られて、各モジュールの組合わせ
により必要な電源を作成している。Power supplies for communication equipment used in switching equipment, transmission equipment, etc.
DC human power/DC output power supply circuits such as DC/DC converters are commonly used, but these power supplies convert an input voltage of 48V to an output voltage of 5V or ±12V for communication equipment. For example, an example of the power supply rating for communication equipment used as a power supply is input 48V, output s
V, iH current capacity of 2 to 3 A, output voltage fluctuation suppressed within ±5%, and has been adopted as a power source for small capacity exchangers. In order to accommodate the standardization and mass production of power supply boards, these power supplies are modularized, and the necessary power supplies are created by combining each module.

〔従来の技術〕[Conventional technology]

出力容量が同一で２種以上の異なる出力電圧、出力電流
に対応するスイッチング・レギュレータの従来の接続構
成図を第３図に示す。図において、同一容量の電源２０
と電源３０は５Ｖ、ＩＡの電源容量とし、電源２０は電
源変換部２１と整流平滑部２２と電圧制御部２３とから
なり、電源３０は電源変換部３１と整流平滑部３２と電
圧制御部３３とからなる。FIG. 3 shows a conventional connection configuration diagram of a switching regulator that has the same output capacity but can handle two or more different output voltages and output currents. In the figure, power supply 20 of the same capacity
The power supply 30 has a power capacity of 5V and IA, and the power supply 20 includes a power conversion section 21, a rectification and smoothing section 22, and a voltage control section 23; It consists of.

電源２０において、電源変換部２１は電源供給用コンデ
ンサＣＩと電源トランスＴＩと過電流監視用線輪ＣＴＩ
　とスイッチングトランジスタＴｒｉ　とからなり、ス
イッチングトランジスタのオンオフにより入力電圧４８
Ｖを交流電圧に変換し、電源トランスＴ１により変圧し
て２次側に出力する。整流平滑部２２は変圧された交流
出力を整流平滑化して５■の直流電圧として負荷側に送
出する。電圧制御部２３はフィードバックされた出力電
圧により電源変換部２１のスイッチングトランジスタＴ
ｒｉのオンオフを制御して電圧変動を自動制御する。電
源変換部２１の過電流検出用線輪ＣＴＩは負荷側に流れ
る過電流を電源トランスＴ１の１次側で監視し、過電流
になれば電圧制御部２３を制御してスイッチングトラン
ジスタＴｒｉをオフにし入力電圧を切断して電源を保護
する。In the power supply 20, the power conversion unit 21 includes a power supply capacitor CI, a power transformer TI, and an overcurrent monitoring coil CTI.
and a switching transistor Tri, and the input voltage is changed by turning on and off the switching transistor.
V is converted into an alternating current voltage, transformed by a power transformer T1, and output to the secondary side. The rectifying and smoothing section 22 rectifies and smoothes the transformed AC output and sends it to the load side as a 5cm DC voltage. The voltage control section 23 controls the switching transistor T of the power supply conversion section 21 based on the feedback output voltage.
Automatically controls voltage fluctuations by controlling on/off of ri. The overcurrent detection wire CTI of the power converter 21 monitors the overcurrent flowing to the load side on the primary side of the power transformer T1, and if an overcurrent occurs, controls the voltage controller 23 to turn off the switching transistor Tri. Protect the power supply by disconnecting the input voltage.

電源３０も電源２０と同一構成であり、電源変換部３１
は電源供給用コンデンサＣ２と電源トランスＴ２と過電
流監視用線輪ＣＴ２とスイッチングトランジスタＴｒ２
とからなり、変換された出力を整流平滑部３２により整
流して直流５Ｖを負荷側に送出し、フィードバックされ
た出力電圧により電圧制御部３３で電源変換部３１の入
力側を自動制御し、過電流になれば過電流検出用線輪Ｃ
Ｔ２により検出して入力側を制御する。The power supply 30 also has the same configuration as the power supply 20, and the power supply converter 31
are a power supply capacitor C2, a power transformer T2, an overcurrent monitoring wire CT2, and a switching transistor Tr2.
The converted output is rectified by the rectifying and smoothing section 32 to send 5 V DC to the load side, and the input side of the power converting section 31 is automatically controlled by the voltage control section 33 based on the feedback output voltage. If it becomes a current, overcurrent detection coil C
T2 is used to detect and control the input side.

以上の２つの電源２０及び３０の５Ｖ、ＩＡの出力電圧
を組合わせて、並列にすることにより５Ｖ。By combining the 5V and IA output voltages of the above two power supplies 20 and 30 and paralleling them, 5V can be obtained.

２Ａを作成し、直列にすることによりＩＯＶ、　Ｉ　Ａ
の電圧を得ることが出来る。By creating 2A and connecting it in series, IOV, IA
voltage can be obtained.

〔発明が解決しようとする課題〕[Problem to be solved by the invention]

したがって、従来の電源モジュールでは出力容量が同じ
でも、出力電圧、出力電流の異なる電源を得るためには
２つの電源モジュールを組合わせて作成しなければなら
ない。これは電源盤の標準化、量産化対応を阻害する原
因となっていた。Therefore, in conventional power supply modules, two power supply modules must be combined to obtain power supplies with different output voltages and output currents even if the output capacity is the same. This hindered the standardization and mass production of power panels.

本発明は、出力容量が同一で２種以上の出力電圧、出力
電流に対応するスイッチング・レギュレータを１個のモ
ジュールで構成することを目的とする。An object of the present invention is to configure a switching regulator that has the same output capacity and can handle two or more types of output voltages and output currents into one module.

〔課題を解決するための手段〕 本発明の原理構成図を第１図に示す。図において、１は
スイッチングトランジスタのオンオフにより直流電源を
変換する電源変換部、２は該電源変換部の出力を整流平
滑化して直流を負荷側に送出する整流平滑部、３は該出
力電圧をフィードバンクして電源変換部のスイッチング
トランジスタのオンオフを制御する電圧制御部、４は該
電源変換部の出力側と該整流平滑部との間に接続する同
一捲線比の捲線を有する電流検出トランスを示す。[Means for Solving the Problems] A basic configuration diagram of the present invention is shown in FIG. In the figure, 1 is a power converter that converts DC power by turning on and off switching transistors, 2 is a rectifier and smoother that rectifies and smoothes the output of the power converter, and sends DC to the load side, and 3 is a feed for the output voltage. a voltage control section that controls on/off of the switching transistor of the power supply conversion section; 4 indicates a current detection transformer having a winding with the same winding ratio connected between the output side of the power supply conversion section and the rectification and smoothing section; .

該電源変換部１のトランスの２次側捲線を同一！＠線数
の２つの捲線とし、電源変換部ｌのトランスの一方の２
次側捲線の一側と電流検出トランス４の１次側捲線の一
側とを接続し、電源変換部ｌのトランスの他方の２次側
捲線の＋側と電流検出トランス４の２次側捲線の一側と
を接続し、該電流検出トランス４の１次側捲線の＋側と
２次側捲線の＋側とを整流平滑部２を経由して２電源出
力端子のそれぞれ片側の端子とするように構成する。The secondary winding of the transformer of the power converter 1 is the same! There are two windings of the number of wires, and one 2 of the transformer of the power converter l.
Connect one side of the secondary winding to one side of the primary winding of the current detection transformer 4, and connect the + side of the other secondary winding of the transformer of the power converter l to the secondary winding of the current detection transformer 4. The positive side of the primary winding and the positive side of the secondary winding of the current detection transformer 4 are connected to one side of the two power output terminals via the rectifying and smoothing section 2. Configure it as follows.

〔作用］ 入力電圧を■とし、出力電圧を■１とＶ２とし、出力電
圧をＶ、（！：Ｖ２とは同一容量（同一電圧、同一電流
）とする。出力電圧のＶｌと■２の一方■２をフィード
パンクして電圧制御部３に接続して電源変換部１を自動
制御する。[Operation] The input voltage is ■, the output voltages are ■1 and V2, the output voltage is V, (!: V2 is the same capacity (same voltage, same current). One of the output voltages Vl and ■2 (2) Feedpuncture the power source 2 and connect it to the voltage control section 3 to automatically control the power conversion section 1.

電源変換部１のトランスＴは１次側捲線Ｉと２次側捲線
■と■とからなり、２次側捲線■と■は同一捲線数から
構成されて同一の出力電圧を２次側に送出する。電流検
出トランス４は同一捲線比の１次捲線■と２次捲線■と
からなり、カレントトランスとして双方の出力電流のバ
ランスヲ取ル働きをする。The transformer T of the power converter 1 consists of a primary winding I and secondary windings ■ and ■, and the secondary windings ■ and ■ have the same number of windings and send out the same output voltage to the secondary side. do. The current detection transformer 4 consists of a primary winding (2) and a secondary winding (2) having the same winding ratio, and functions as a current transformer to balance the output currents of both windings.

■　出力電圧の一方の電圧■２をフィードバックして電
圧制御部３で監視し、電源変換部１のスイッチングトラ
ンジスタＴｒのオンオフを制御しているが、他方の出力
電圧■１の変動に対しても電流検出トランス４により電
圧制御部３に伝達され、電源変換部１のスイッチングト
ランジスタＴｒのオンオフを自動制御する。■ One of the output voltages (■2) is fed back and monitored by the voltage control unit 3 to control the on/off of the switching transistor Tr of the power supply conversion unit 1. The current is transmitted to the voltage control section 3 by the current detection transformer 4, and automatically controls on/off of the switching transistor Tr of the power supply conversion section 1.

■　電源変換部ｌの過電流検出用線輪ＣＴ３は出力電圧
■１と■、のどちらか一方の負荷に過電流が流れる場合
にも、１次側捲線■に流れる過電流を監視して電圧制御
部３を起動してスイッチングトランジスタＴｒをオフに
する。■ The overcurrent detection wire CT3 of the power converter l monitors the overcurrent flowing to the primary winding ■ and detects the voltage even if an overcurrent flows through the load of either the output voltage ■1 or ■. The control unit 3 is activated to turn off the switching transistor Tr.

■　出力電圧■、と■２の片方の端子Ｅ、とＥｔとを接
続することにより、出力電圧Ｖ１　＋■２を直列電圧と
して２倍の電圧を作成出来、■１と■２とを接続するこ
とにより並列電圧として容量の２倍の同一電圧を作成す
ることが可能である。並列接続の場合は電流検出トラン
ス４により双方の並列回路のインピーダンスのバランス
を取ることが出来る。■ By connecting one terminal E and Et of output voltages ■ and ■2, output voltage V1 + ■2 can be used as a series voltage to create twice the voltage, and connect ■1 and ■2. By doing so, it is possible to create the same voltage twice the capacity as a parallel voltage. In the case of parallel connection, the impedance of both parallel circuits can be balanced by the current detection transformer 4.

■　電圧制御部榛は出力電圧の直列接続の場合も並列接
続の場合も同様に出力監視が可能で、電圧制御部本の調
整により出力電圧を規定の１２０％以上可変することが
出来る。(2) The voltage control unit can monitor the output whether the output voltage is connected in series or in parallel, and the output voltage can be varied by 120% or more of the specified value by adjusting the voltage control unit.

〔実施例〕〔Example〕

本発明のスイッチング・レギュレータの実施例の接続構
成図を第２図に示す。図は出力電圧５■、ＩＡの出力を
２個出力側で接続した場合を示し、図（ａ）は出力側を
並列接続した場合、図（ｂ）は出力側を直列接続した場
合を示す。図において、１１は電源変換部、１２は整流
平滑部、１３は電圧制御部、１４は電流検出トランスを
示す。A connection configuration diagram of an embodiment of the switching regulator of the present invention is shown in FIG. The figure shows the case where two IA outputs with an output voltage of 5.5 cm are connected on the output side.Figure (a) shows the case where the output sides are connected in parallel, and figure (b) shows the case where the output sides are connected in series. In the figure, 11 is a power converter, 12 is a rectifier and smoother, 13 is a voltage controller, and 14 is a current detection transformer.

第２図（ａ）の並列接続の場合において、入力電圧４８
Ｖ、並列の出力電圧５■、２Ａ、容量１０Ｗの電源が形
成される。電流検出トランス１４はトランスＴの２次側
捲線■と■に流れる電流のバランスを取るインピーダン
スの整合回路で、電流検出トランス１４の１次側捲線ｉ
ｖと２次側捲線■の両端電圧がそれぞれ同一になるよう
にインピーダンスを整合している。したがって、出力側
の負荷の変動に対しても並列接続の電源回路には、それ
ぞれ同一の電流が流れるように平衡化する機能を有して
いる。即ち、一方の出力側から電圧制御部１３にフィー
ドバックして自動電圧調整しても、２次側出力はバラン
スして安定化した出力を得ることが可能である。In the case of the parallel connection shown in Fig. 2(a), the input voltage 48
A power supply with a parallel output voltage of 5V, 2A, and a capacity of 10W is formed. The current detection transformer 14 is an impedance matching circuit that balances the current flowing through the secondary windings ■ and ■ of the transformer T.
The impedances are matched so that the voltages across the secondary winding (v) and the secondary winding (2) are the same. Therefore, even when the load on the output side varies, the parallel-connected power supply circuits have a balancing function so that the same current flows in each of the power supply circuits. That is, even if automatic voltage adjustment is performed by feeding back from one output side to the voltage control section 13, it is possible to obtain a balanced and stabilized output on the secondary side.

第２図（ｂ）の直列接続の場合において、入力電圧４８
Ｖ、直列の出力電圧１０Ｖ、ＩＡ、容量１０Ｗの電源が
形成される。電流検出トランス１４には直列接続のため
絶えず同一の電流が流れ、直列接続された各々の電源に
はバランスした電流が流れるので、安定化した出力を得
ることが可能である。In the case of series connection shown in Fig. 2(b), the input voltage 48
V, a series output voltage of 10V, IA, a power supply with a capacity of 10W is formed. Since the current detection transformer 14 is connected in series, the same current constantly flows through it, and balanced current flows through each of the power supplies connected in series, so it is possible to obtain a stabilized output.

なお、電圧制御部１３は１２０％以上出力電圧を可変で
きるので、並列接続の場合は出力電圧６■、出力電流１
．６Ａ、容量１０Ｗまで可変にすることができ、また直
列接続の場合は出力電圧１２Ｖ、出力電流０．８Ａ、容
量１０Ｗまで可変にすることが可能である。Note that the voltage control unit 13 can vary the output voltage by 120% or more, so in the case of parallel connection, the output voltage is 6 and the output current is 1.
．． It is possible to make the output voltage variable up to 6A and the capacity 10W, and in the case of series connection, it is possible to make the output voltage variable up to 12V, the output current 0.8A, and the capacity 10W.

また、出力側のＥ端子を接続しないで、別々に出力させ
ることにより＋５Ｖ、ＩＡと、−５ｖ。Also, by not connecting the E terminal on the output side and outputting them separately, +5V, IA, and -5V.

ＩＡのそれぞれ５Ｗ容量の２電源を得られ、同様に＋６
Ｖ、０．８Ａと、−６Ｖ、０．８Ａのそれぞれ５Ｗ容量
の２電源を得ることが出来る。なおこの場合は、直列接
続の２次側の整流平滑部１２の整流器等の素子の定格容
量を２倍に増やす必要がある。You can get 2 power supplies of 5W capacity each for IA, and also +6
It is possible to obtain two power supplies of 5W capacity each: V, 0.8A and -6V, 0.8A. In this case, it is necessary to double the rated capacity of an element such as a rectifier in the rectifying and smoothing section 12 on the secondary side of the series connection.

易になり、製造期間の短縮が図られ、量産化によるコス
トダウン効果も期待出来る。This makes it easier to manufacture, shortens the manufacturing period, and can be expected to reduce costs through mass production.

【図面の簡単な説明】[Brief explanation of drawings]

第１図は本発明の原理構成図、第２図は実施例の接続構
成図、第３図は従来例の接続構成図を示す。 図において、Ｉ　、　ＩＬ　２１．３１は電ｇ変換部、
２゜１２、２２．３２は整流平滑部、３．１３．２３．
３３は電圧制御部、４，１４は電流検出トランス、２０
．３０は電源を示す。 〔発明の効果］FIG. 1 is a diagram showing the principle configuration of the present invention, FIG. 2 is a connection configuration diagram of an embodiment, and FIG. 3 is a connection configuration diagram of a conventional example. In the figure, I and IL 21.31 are electric g conversion parts,
2゜12, 22.32 is a rectification smoothing part, 3.13.23.
33 is a voltage control unit, 4 and 14 are current detection transformers, 20
．． 30 indicates a power source. 〔Effect of the invention]

Claims (1)

【特許請求の範囲】 出力容量が同一で２種以上の出力電圧、出力電流に対応
するスイッチング・レギュレータにおいて、 スイッチングトランジスタのオンオフにより直流電源を
変換する電源変換部（１）と、該電源変換部の出力を整
流平滑化する整流平滑部（２）と、該出力電圧によりス
イッチングトランジスタのオンオフを制御する電圧制御
部（３）とを有し、該電源変換部（１）の出力側と該整
流平滑部（２）との間に同一捲線比の捲線を有する電流
検出トランス（４）を備え、該電源変換部（１）のトラ
ンスの２次側捲線を同一捲線、数の２つの捲線とし、電
源変換部（１）のトランスの一方の２次側捲線の−側と
電流検出トランス（４）の１次側捲線の−側とを接続し
、電源変換部（１）のトランスの他方の２次側捲線の＋
側と電流検出トランス（４）の２次側捲線の−側とを接
続し、該電流検出トランス（４）の１次側捲線の＋側と
２次側捲線の＋側とを整流平滑部（２）を経由して２電
源出力端子のそれぞれ片側の端子とすることを特徴とす
るスイッチング・レギュレータ。[Scope of Claims] A switching regulator that has the same output capacity and can handle two or more types of output voltages and output currents, comprising: a power converter (1) that converts a DC power source by turning on and off a switching transistor; a rectifying and smoothing section (2) that rectifies and smoothes the output of the power supply converting section (1), and a voltage control section (3) that controls on/off of the switching transistor according to the output voltage, A current detection transformer (4) having a winding with the same winding ratio is provided between the smooth part (2), and the secondary winding of the transformer of the power converting part (1) is the same winding, two windings in number, Connect the - side of one of the secondary windings of the transformer of the power converter (1) and the - side of the primary winding of the current detection transformer (4), and Next winding +
side and the negative side of the secondary winding of the current detection transformer (4), and connect the positive side of the primary winding and the positive side of the secondary winding of the current detection transformer (4) to the rectifying smoothing part ( 2) A switching regulator characterized in that each of the two power supply output terminals is connected to one side of the terminal via the terminal.
JP5302790A 1990-03-05 1990-03-05 Switching regulator Pending JPH03256561A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5302790A JPH03256561A (en) 1990-03-05 1990-03-05 Switching regulator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5302790A JPH03256561A (en) 1990-03-05 1990-03-05 Switching regulator

Publications (1)

Publication Number Publication Date
JPH03256561A true JPH03256561A (en) 1991-11-15

Family

ID=12931410

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5302790A Pending JPH03256561A (en) 1990-03-05 1990-03-05 Switching regulator

Country Status (1)

Country Link
JP (1) JPH03256561A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999063651A1 (en) * 1998-05-29 1999-12-09 Fronius Schweissmaschinen Kg Austria Symmetry device
GB2438880A (en) * 2006-06-06 2007-12-12 Pi Internat Ltd Adjusting the output voltage of a transformer

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999063651A1 (en) * 1998-05-29 1999-12-09 Fronius Schweissmaschinen Kg Austria Symmetry device
GB2438880A (en) * 2006-06-06 2007-12-12 Pi Internat Ltd Adjusting the output voltage of a transformer
GB2438880B (en) * 2006-06-06 2008-10-08 Pi Internat Ltd Circuit for adjusting the output voltage of a transformer

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