JPH09294373A - Snubber circuit of insulation type ac/dc conversion device - Google Patents
Snubber circuit of insulation type ac/dc conversion deviceInfo
- Publication number
- JPH09294373A JPH09294373A JP10489296A JP10489296A JPH09294373A JP H09294373 A JPH09294373 A JP H09294373A JP 10489296 A JP10489296 A JP 10489296A JP 10489296 A JP10489296 A JP 10489296A JP H09294373 A JPH09294373 A JP H09294373A
- Authority
- JP
- Japan
- Prior art keywords
- snubber
- full
- circuit
- wave rectifier
- rectifier circuit
- 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
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Landscapes
- Rectifiers (AREA)
- Dc-Dc Converters (AREA)
- Power Conversion In General (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、全波整流器を使
って交流電源とは絶縁された直流電力を得る際の前記全
波整流器を保護する絶縁形交流／直流変換装置のスナバ
回路に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a snubber circuit of an insulation type AC / DC converter that protects a full-wave rectifier when using the full-wave rectifier to obtain DC power insulated from an AC power source.
【０００２】[0002]
【従来の技術】図２は交流側とは絶縁された直流電力を
出力する絶縁形交流／直流変換装置の従来例を示した回
路図である。この図２の従来例回路に図示のように、従
来は一次巻線とは絶縁された二次巻線を有する変圧器２
の前記一次巻線に交流電源１を接続し、半導体素子をフ
ルブリッジ接続して構成した全波整流回路３を前記二次
巻線に接続する。なお、変圧器２には漏れインダクタン
ス８が存在する。また、全波整流回路３を構成する半導
体素子としてはサイリスタやトランジスタなどもある
が、ダイオードならば制御回路が不要で構造が単純で低
価格の整流回路を構成できるので、以下ではダイオード
を使用した場合について説明する。2. Description of the Related Art FIG. 2 is a circuit diagram showing a conventional example of an insulation type AC / DC converter which outputs DC power insulated from the AC side. As shown in the conventional circuit of FIG. 2, the transformer 2 has a secondary winding that is conventionally insulated from the primary winding.
The AC power supply 1 is connected to the primary winding, and the full-wave rectifier circuit 3 configured by connecting semiconductor elements in a full bridge is connected to the secondary winding. A leakage inductance 8 exists in the transformer 2. Further, as a semiconductor element forming the full-wave rectifier circuit 3, there are a thyristor, a transistor, etc., but if a diode is used, a control circuit is not necessary and a low-priced rectifier circuit can be formed. Therefore, a diode is used in the following. The case will be described.
【０００３】交流電力を全波整流回路３で整流して得ら
れる直流電力にはリップル分が含まれているので、全波
整流回路３の直流側には平滑リアクトル４と平滑コンデ
ンサ５とでなる平滑回路を設けてこのリップル分を除去
し、平滑された直流電力を直流負荷６へ供給する。例え
ば全波整流回路３を構成しているダイオード３Ｕとダイ
オード３Ｙとが導通して直流負荷６へ電力を供給しいる
ときに、交流電源１の極性が反転してダイオード３Ｖと
ダイオード３Ｘとが導通となる転流時（またはダイオー
ド３Ｖとダイオード３Ｘとの導通からダイオード３Ｕと
ダイオード３Ｙとの導通となる転流時）に発生するダイ
オードのリカバリー電流により、前記の漏れインダクタ
ンス８にエネルギーが蓄えられる。このエネルギーがス
イッチング時のサージ電圧となって全波整流回路３を構
成する各ダイオードを破壊する恐れがある。そこでこの
スイッチングサージ電圧に耐えられるように高耐電圧特
性のダイオードを選定すると、このダイオードが大形・
高価になり、装置全体が大形化・高価格化する不都合が
ある。そこで全波整流回路３の直流出力側と前述した平
滑回路との間にＲＣスナバ回路７を設置することで、前
記のスイッチングサージ電圧の吸収を図っている。Since the DC power obtained by rectifying the AC power by the full-wave rectifier circuit 3 contains a ripple component, the smoothing reactor 4 and the smoothing capacitor 5 are provided on the DC side of the full-wave rectifier circuit 3. A smoothing circuit is provided to remove this ripple and supply smoothed DC power to the DC load 6. For example, when the diode 3U and the diode 3Y forming the full-wave rectifier circuit 3 are conducting to supply electric power to the DC load 6, the polarity of the AC power supply 1 is inverted and the diode 3V and the diode 3X are conducting. Energy is stored in the leakage inductance 8 by the recovery current of the diode generated at the time of commutation (or at the time of commutation from conduction between the diode 3V and the diode 3X to conduction between the diode 3U and the diode 3Y). This energy may become a surge voltage at the time of switching and destroy each diode forming the full-wave rectifier circuit 3. Therefore, if a diode with a high withstand voltage characteristic is selected to withstand this switching surge voltage, this diode is
There is a disadvantage in that it becomes expensive and the entire apparatus becomes large and expensive. Therefore, the RC snubber circuit 7 is installed between the DC output side of the full-wave rectifier circuit 3 and the above-mentioned smoothing circuit to absorb the switching surge voltage.
【０００４】[0004]
【発明が解決しようとする課題】ところで図２の従来例
回路では、平滑コンデンサ５の電圧は全波整流回路３の
直流側電圧振幅値よりも低くなり、常にこの直流側電圧
振幅値よりも安定して高い電位点は存在しない。そのた
め図２に図示の従来例回路では適当なクランプ先が無い
ので、放電阻止形のクランプ式スナバ回路を採用するの
は困難であり、図示している充放電形のＲＣスナバ回路
７を使用せざるを得ない。このＲＣスナバ回路７は単純
な構成であるが発生損失が大きい欠点がある。ＲＣスナ
バ回路７を構成しているスナバコンデンサ７Ｃの静電容
量をＣS ，交流電源１の電圧振幅値をＶP ，交流電源１
の周波数をｆとすると、ＲＣスナバ回路７での発生損失
ＰSは下記の数式１で表される。By the way, in the conventional circuit of FIG. 2, the voltage of the smoothing capacitor 5 becomes lower than the DC side voltage amplitude value of the full-wave rectifier circuit 3, and is always more stable than this DC side voltage amplitude value. And there is no high potential point. Therefore, in the conventional circuit shown in FIG. 2, since there is no suitable clamp tip, it is difficult to adopt the clamp type snubber circuit of the discharge blocking type, and the charge / discharge type RC snubber circuit 7 shown in FIG. I have no choice. Although this RC snubber circuit 7 has a simple structure, it has a drawback that the generated loss is large. The capacitance of the snubber capacitor 7C forming the RC snubber circuit 7 is C S , the voltage amplitude value of the AC power supply 1 is V P , and the AC power supply 1 is
Where f is the frequency of, the generated loss P S in the RC snubber circuit 7 is expressed by the following formula 1.
【０００５】[0005]
【数１】ＰS ≧ＣS ・ＶP 2 ・ｆ 交流電源１の周波数を高くすれば交流電源１と直流側と
を絶縁するための変圧器２を小形・軽量にできるので、
装置全体を小形化が可能になるから、交流電力の周波数
は極力高くしたいが、数式１に示すようにＲＣスナバ回
路７での損失は周波数に比例して大きくなり、この損失
に伴う発熱の処理のために装置が大形化する不都合があ
るし、装置の効率が低下する不具合も生じる。[Formula 1] P S ≧ C S · V P 2 · f If the frequency of the AC power supply 1 is increased, the transformer 2 for insulating the AC power supply 1 from the DC side can be made compact and lightweight.
Since it is possible to downsize the entire device, it is desirable to make the frequency of the AC power as high as possible, but as shown in Formula 1, the loss in the RC snubber circuit 7 becomes large in proportion to the frequency, and the heat generated by this loss is treated. Therefore, the size of the device becomes large, and the efficiency of the device decreases.
【０００６】そこでこの発明の目的は、絶縁形交流／直
流変換装置へ入力する交流電源の周波数が高くても、整
流回路を保護するスナバ回路が発生する損失を抑制でき
るようにすることにある。Therefore, an object of the present invention is to suppress the loss generated in the snubber circuit for protecting the rectifier circuit even if the frequency of the AC power source input to the insulation type AC / DC converter is high.
【０００７】[0007]
【課題を解決するための手段】前記の目的を達成するた
めにこの発明の絶縁形交流／直流変換装置のスナバ回路
は、相互に絶縁された１つの一次巻線と２つの二次巻線
とを備えている変圧器の前記一次巻線に交流電源を接続
し、半導体素子のフルブリッジ接続でなる第１全波整流
回路を一方の二次巻線に接続し、この第１全波整流回路
と同じ構成の第２全波整流回路を他方の二次巻線に接続
し、第１全波整流回路の負極側と第２全波整流回路の正
極側とを平滑リアクトルを介して接続し、第１全波整流
回路の正極側と第２全波整流回路の負極側との間に平滑
コンデンサを接続し、直流負荷をこの平滑コンデンサに
並列に接続し、第１スナバコンデンサと第１スナバダイ
オードとの直列回路を前記第１全波整流回路の正極側と
負極側との間に接続し、この第１スナバコンデンサと第
１スナバダイオードの結合点と前記平滑コンデンサの負
極側とを第１スナバ抵抗を介して接続することで、当該
第１スナバコンデンサの電圧を平滑コンデンサの電圧に
クランプし、第２スナバコンデンサと第２スナバダイオ
ードとの直列回路を前記第２全波整流回路の正極側と負
極側との間に接続し、この第２スナバコンデンサと第２
スナバダイオードの結合点と前記平滑コンデンサの正極
側とを第２スナバ抵抗を介して接続することで、当該第
２スナバコンデンサの電圧を平滑コンデンサの電圧にク
ランプする。To achieve the above object, a snubber circuit of an insulated AC / DC converter according to the present invention comprises a primary winding and two secondary windings insulated from each other. AC power source is connected to the primary winding of the transformer, and the first full-wave rectifying circuit, which is a full-bridge connection of semiconductor elements, is connected to one secondary winding. The second full-wave rectifier circuit having the same configuration as the above is connected to the other secondary winding, and the negative side of the first full-wave rectifier circuit and the positive side of the second full-wave rectifier circuit are connected via a smoothing reactor, A smoothing capacitor is connected between the positive electrode side of the first full-wave rectifier circuit and the negative electrode side of the second full-wave rectifier circuit, and a DC load is connected in parallel to this smoothing capacitor, and a first snubber capacitor and a first snubber diode are connected. And a series circuit connected between the positive side and the negative side of the first full-wave rectifier circuit. Then, the voltage of the first snubber capacitor is clamped to the voltage of the smoothing capacitor by connecting the coupling point of the first snubber capacitor and the first snubber diode and the negative side of the smoothing capacitor via the first snubber resistor. Then, a series circuit of the second snubber capacitor and the second snubber diode is connected between the positive electrode side and the negative electrode side of the second full-wave rectifier circuit, and the second snubber capacitor and the second snubber capacitor are connected.
The voltage of the second snubber capacitor is clamped to the voltage of the smoothing capacitor by connecting the connection point of the snubber diode and the positive electrode side of the smoothing capacitor via the second snubber resistor.
【０００８】前記交流電源が出力する交流波形は、正極
性パルスと負極性パルスとの合計が５０％以上の導通率
で交互に繰り返される波形にすることにより、平滑コン
デンサの電圧を前記第１全波整流回路または第２全波整
流回路の直流出力側電圧振幅値よりも高くする。The alternating current waveform output from the alternating current power source is a waveform in which the positive polarity pulse and the negative polarity pulse are alternately repeated at a conduction rate of 50% or more, whereby the voltage of the smoothing capacitor is changed to the first total voltage. It is made higher than the DC output side voltage amplitude value of the wave rectifier circuit or the second full-wave rectifier circuit.
【０００９】[0009]
【発明の実施の形態】図１は本発明の実施例を表した回
路図である。この実施例回路における交流電源１は２つ
の二次巻線１２と１３とを備えた変圧器１０の一次巻線
１１に接続されるが、これら３つの巻線は相互に絶縁さ
れている。この二次巻線１２には漏れインダクタンス１
４があり、二次巻線１３には漏れインダクタンス１５が
ある。変圧器１０の一方の二次巻線１２には、半導体素
子としてのダイオードをフルブリッジ接続した第１全波
整流回路２０を接続し、他方の二次巻線１３も同じ構成
の第２全波整流回路３０を接続する。第１全波整流回路
２０の負極側と第２全波整流回路３０の正極側とは平滑
リアクトル４を介して接続する。更に第１全波整流回路
２０の正極側と第２全波整流回路３０の負極側との間に
は平滑コンデンサ５を接続する。出力する直流電力に含
まれるリップル分は、これら平滑リアクトル４と平滑コ
ンデンサ５とにより除去されるから、平滑コンデンサ５
に並列に接続されている直流負荷６へは平滑された直流
電力が与えられる。FIG. 1 is a circuit diagram showing an embodiment of the present invention. The AC power supply 1 in this example circuit is connected to a primary winding 11 of a transformer 10 with two secondary windings 12 and 13, these three windings being insulated from one another. This secondary winding 12 has a leakage inductance 1
4 and the secondary winding 13 has a leakage inductance 15. A first full-wave rectifying circuit 20 in which a diode as a semiconductor element is full-bridge connected is connected to one secondary winding 12 of the transformer 10, and the other secondary winding 13 has a second full-wave rectifying circuit of the same configuration. The rectifier circuit 30 is connected. The negative side of the first full-wave rectifier circuit 20 and the positive side of the second full-wave rectifier circuit 30 are connected via the smoothing reactor 4. Further, a smoothing capacitor 5 is connected between the positive side of the first full-wave rectifier circuit 20 and the negative side of the second full-wave rectifier circuit 30. Since the ripple component contained in the output DC power is removed by the smoothing reactor 4 and the smoothing capacitor 5, the smoothing capacitor 5
The smoothed DC power is applied to the DC load 6 connected in parallel with.
【００１０】第１スナバコンデンサ２６と第１スナバダ
イオード２７との直列回路を前記の第１全波整流回路２
０の正極側と負極側との間に接続し、これら第１スナバ
コンデンサ２６と第１スナバダイオード２７との結合点
には第１スナバ抵抗２８の一端を接続し、その他端は前
記平滑コンデンサ５の負極側に接続するが、これら第１
スナバコンデンサ２６，第１スナバダイオード２７およ
び第１スナバ抵抗２８とで第１スナバ回路２５を構成す
る。同様に、第２スナバコンデンサ３６と第２スナバダ
イオード３７との直列回路を前記第２全波整流回路３０
の正極側と負極側との間に接続し、これら第２スナバコ
ンデンサ３６と第２スナバダイオード３７との結合点に
接続した第２スナバ抵抗３８の他端を平滑コンデンサ５
の正極側に接続するが、これら第２スナバコンデンサ３
６，第２スナバダイオード３７および第２スナバ抵抗３
８とで第２スナバ回路３５を構成する。The series circuit of the first snubber capacitor 26 and the first snubber diode 27 is connected to the first full-wave rectifier circuit 2 described above.
0 is connected between the positive electrode side and the negative electrode side, one end of the first snubber resistor 28 is connected to the connection point of the first snubber capacitor 26 and the first snubber diode 27, and the other end is connected to the smoothing capacitor 5 It is connected to the negative electrode side of
The snubber capacitor 26, the first snubber diode 27, and the first snubber resistor 28 form a first snubber circuit 25. Similarly, the series circuit of the second snubber capacitor 36 and the second snubber diode 37 is connected to the second full-wave rectifier circuit 30.
Is connected between the positive electrode side and the negative electrode side of the second snubber capacitor 36 and the second snubber diode 37, and the other end of the second snubber resistor 38 is connected to the smoothing capacitor 5
Connected to the positive electrode side of the second snubber capacitor 3
6, second snubber diode 37 and second snubber resistor 3
And 8 form a second snubber circuit 35.
【００１１】交流電源１からの交流電力は変圧器１０で
絶縁されたのち、第１全波整流回路２０と第２全波整流
回路３０とにより直流電力に変換されるが、この直流電
力は平滑リアクトル４と平滑コンデンサ５とにより平滑
されて直流負荷６へ与えられる。ここで交流電源１の極
性が反転する際に、第１全波整流回路２０ではダイオー
ド２１と２４，又はダイオード２２と２３の転流・リカ
バリー動作に伴って、変圧器１０の漏れインダクタンス
１４に蓄えられたエネルギーは、漏れインダクタンス１
４→ダイオード２１→第１スナバコンデンサ２６→第１
スナバダイオード２７→ダイオード２４→二次巻線１２
（または漏れインダクタンス１４→ダイオード２２→第
１スナバコンデンサ２６→第１スナバダイオード２７→
ダイオード２３→二次巻線１２）の経路で第１スナバコ
ンデンサ２６へ吸収されるから、スイッチングサージ電
圧は当該第１スナバコンデンサ２６の電圧に制限され、
第１全波整流回路２０を保護する。この第１スナバコン
デンサ２６の電圧は、第１スナバ抵抗２８を介して平滑
コンデンサ５の電圧にクランプされる。第２全波整流回
路３０と第２スナバ回路３５の動作も前記と同様であっ
て、第２スナバコンデンサ３６の電圧は第２スナバ抵抗
３８を介して平滑コンデンサ５の電圧にクランプされ
る。The AC power from the AC power supply 1 is insulated by the transformer 10 and then converted into DC power by the first full-wave rectifier circuit 20 and the second full-wave rectifier circuit 30. This DC power is smoothed. It is smoothed by the reactor 4 and the smoothing capacitor 5 and given to the DC load 6. Here, when the polarity of the AC power supply 1 is reversed, the first full-wave rectifier circuit 20 stores in the leakage inductance 14 of the transformer 10 with the commutation / recovery operation of the diodes 21 and 24 or the diodes 22 and 23. The energy stored is the leakage inductance 1
4 → diode 21 → first snubber capacitor 26 → first
Snubber diode 27 → diode 24 → secondary winding 12
(Or leakage inductance 14 → diode 22 → first snubber capacitor 26 → first snubber diode 27 →
The switching surge voltage is limited to the voltage of the first snubber capacitor 26 because it is absorbed by the first snubber capacitor 26 in the path of the diode 23 → secondary winding 12).
The first full-wave rectifier circuit 20 is protected. The voltage of the first snubber capacitor 26 is clamped to the voltage of the smoothing capacitor 5 via the first snubber resistor 28. The operations of the second full-wave rectifier circuit 30 and the second snubber circuit 35 are similar to the above, and the voltage of the second snubber capacitor 36 is clamped to the voltage of the smoothing capacitor 5 via the second snubber resistor 38.
【００１２】交流電源１が出力する交流電力の周波数が
高ければ、変圧器１０を小形化・軽量化できることは既
に述べた。そこで、例えば正極性パルスと負極性パルス
とを高頻度で交互に出力させることで、交流電源１が高
周波交流電力を出力できるようにして、前記パルスの通
流率が合計５０％以上で、且つ二次巻線１２と二次巻線
１３との巻数比を１程度にするならば、平滑コンデンサ
５の電圧は常に第１全波整流回路２０の直流側電圧振幅
値または第２全波整流回路３０の直流側電圧振幅値より
も高くなる。よって第１スナバ回路２５または第２スナ
バ回路３５へ流入するエネルギーは、第１全波整流回路
２０または第２全波整流回路３０を構成するダイオード
がスイッチングする際に漏れインダクタンス１４または
漏れインダクタンス１５に蓄えられたエネルギーだけと
なる。即ち第１スナバ回路２５または第２スナバ回路３
５は余分な損失を生じない放電阻止形のクランプ式スナ
バ回路を実現することになる。It has already been described that the transformer 10 can be made smaller and lighter if the frequency of the AC power output from the AC power source 1 is high. Therefore, for example, the positive polarity pulse and the negative polarity pulse are alternately output at high frequency so that the AC power supply 1 can output the high frequency AC power, and the pulse conduction rate is 50% or more in total, and If the turn ratio between the secondary winding 12 and the secondary winding 13 is set to about 1, the voltage of the smoothing capacitor 5 is always the DC side voltage amplitude value of the first full-wave rectifier circuit 20 or the second full-wave rectifier circuit. It becomes higher than the DC side voltage amplitude value of 30. Therefore, the energy flowing into the first snubber circuit 25 or the second snubber circuit 35 is transferred to the leakage inductance 14 or the leakage inductance 15 when the diodes forming the first full-wave rectification circuit 20 or the second full-wave rectification circuit 30 switch. Only the stored energy is available. That is, the first snubber circuit 25 or the second snubber circuit 3
5 realizes a clamp type snubber circuit of discharge prevention type that does not generate extra loss.
【００１３】[0013]
【発明の効果】従来の絶縁形交流／直流変換装置では、
全波整流回路の直流出力側に設置するスナバ回路のコン
デンサをクランプする適切な電位点が存在しないため
に、このスナバ回路での損失が大きくなる欠点があった
が、本発明では変圧器二次巻線を２組にしてそれぞれに
全波整流回路を接続する回路構成にすることで、当該全
波整流回路の保護に放電阻止形のクランプ式スナバ回路
を採用できる。放電阻止形のクランプ式スナバ回路を使
用すれば、交流電源の周波数を高くしてもスナバ回路で
の損失は大きくならないので、高周波数化による装置の
小形化、スナバ回路の損失低減による装置の小形化、装
置の効率が向上するなどの効果が得られる。また、半導
体素子の耐電圧性能には限界があるから、直流側電圧が
高くなれば整流器を多重化する必要があり、本発明を適
用することによって得られる装置の小形化効果や低損失
化効果は更に大きくなる。According to the conventional insulated AC / DC converter,
Since there is no appropriate potential point for clamping the capacitor of the snubber circuit installed on the DC output side of the full-wave rectifier circuit, there is a disadvantage that the loss in this snubber circuit becomes large, but in the present invention, the transformer secondary By forming a circuit configuration in which two sets of windings are connected to each full-wave rectification circuit, a discharge-prevention clamp type snubber circuit can be used for protection of the full-wave rectification circuit. If you use the clamp type snubber circuit of discharge prevention type, the loss in the snubber circuit will not increase even if the frequency of the AC power supply is increased.Therefore, downsizing the device by increasing the frequency and downsizing the device by reducing the loss of the snubber circuit And the efficiency of the device is improved. Further, since the withstand voltage performance of the semiconductor element is limited, it is necessary to multiplex the rectifier if the DC side voltage becomes higher, and the effect of downsizing and loss reduction of the device obtained by applying the present invention. Will be even larger.
【図１】本発明の実施例を表した回路図FIG. 1 is a circuit diagram showing an embodiment of the present invention.
【図２】交流側とは絶縁された直流電力を出力する絶縁
形交流／直流変換装置の従来例を示した回路図FIG. 2 is a circuit diagram showing a conventional example of an insulated AC / DC converter that outputs DC power that is insulated from the AC side.
１ 交流電源 ２，１０ 変圧器 ３ 全波整流回路 ４ 平滑リアクトル ５ 平滑コンデンサ ６ 直流負荷 ７ ＲＣスナバ回路 ７Ｃ スナバコンデンサ ７Ｒ スナバ抵抗 ８，１４，１５ 漏れインダクタンス １１ 一次巻線 １２，１３ 二次巻線 ２０ 第１全波整流回路 ２５ 第１スナバ回路 ２６ 第１スナバコンデンサ ２７ 第１スナバダイオード ２８ 第１スナバ抵抗 ３０ 第２全波整流回路 ３５ 第２スナバ回路 ３６ 第２スナバコンデンサ ３７ 第２スナバダイオード ３８ 第２スナバ抵抗 1 AC power supply 2,10 Transformer 3 Full wave rectifier circuit 4 Smoothing reactor 5 Smoothing capacitor 6 DC load 7 RC snubber circuit 7C Snubber capacitor 7R Snubber resistance 8, 14, 15 Leakage inductance 11 Primary winding 12, 13 Secondary winding 20 1st full wave rectifier circuit 25 1st snubber circuit 26 1st snubber capacitor 27 1st snubber diode 28 1st snubber resistance 30 2nd full wave rectifier circuit 35 2nd snubber circuit 36 2nd snubber capacitor 37 2nd snubber diode 38 Second snubber resistance
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｈ０２Ｍ 7/10 8726−5Ｈ Ｈ０２Ｍ 7/10 Ｚ ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification number Internal reference number FI Technical indication H02M 7/10 8726-5H H02M 7/10 Z
Claims (2)
二次巻線とを備えている変圧器の前記一次巻線に交流電
源を接続し、半導体素子のフルブリッジ接続でなる第１
全波整流回路を一方の二次巻線に接続し、この第１全波
整流回路と同じ構成の第２全波整流回路を他方の二次巻
線に接続し、第１全波整流回路の負極側と第２全波整流
回路の正極側とを平滑リアクトルを介して接続し、第１
全波整流回路の正極側と第２全波整流回路の負極側との
間に平滑コンデンサを接続し、直流負荷をこの平滑コン
デンサに並列に接続し、第１スナバコンデンサと第１ス
ナバダイオードとの直列回路を前記第１全波整流回路の
正極側と負極側との間に接続し、この第１スナバコンデ
ンサと第１スナバダイオードの結合点と前記平滑コンデ
ンサの負極側とを第１スナバ抵抗を介して接続し、第２
スナバコンデンサと第２スナバダイオードとの直列回路
を前記第２全波整流回路の正極側と負極側との間に接続
し、この第２スナバコンデンサと第２スナバダイオード
の結合点と前記平滑コンデンサの正極側とを第２スナバ
抵抗を介して接続することを特徴とする絶縁形交流／直
流変換装置のスナバ回路。1. An AC power supply is connected to the primary winding of a transformer having one primary winding and two secondary windings insulated from each other, and a full bridge connection of semiconductor devices is provided. 1
The full-wave rectifier circuit is connected to one of the secondary windings, and the second full-wave rectifier circuit having the same configuration as the first full-wave rectifier circuit is connected to the other secondary winding of the first full-wave rectifier circuit. The negative electrode side and the positive electrode side of the second full-wave rectifier circuit are connected via a smoothing reactor,
A smoothing capacitor is connected between the positive electrode side of the full-wave rectifier circuit and the negative electrode side of the second full-wave rectifier circuit, and a DC load is connected in parallel to this smoothing capacitor to connect the first snubber capacitor and the first snubber diode. A series circuit is connected between the positive side and the negative side of the first full-wave rectifier circuit, and the first snubber resistor is connected to the coupling point of the first snubber capacitor and the first snubber diode and the negative side of the smoothing capacitor. Connect through the second
A series circuit of a snubber capacitor and a second snubber diode is connected between the positive side and the negative side of the second full-wave rectifier circuit, and the connection point of the second snubber capacitor and the second snubber diode and the smoothing capacitor are connected. A snubber circuit for an insulation type AC / DC converter, wherein the snubber circuit is connected to the positive electrode side via a second snubber resistor.
置のスナバ回路において、前記交流電源が出力する交流
波形は、正極性パルスと負極性パルスとが合計５０％以
上の通流率で交互に繰り返される波形とすることを特徴
とする絶縁形交流／直流変換装置のスナバ回路。2. The snubber circuit of the insulation type AC / DC converter according to claim 1, wherein the AC waveform output from the AC power supply has a conduction ratio of positive pulse and negative pulse of 50% or more in total. A snubber circuit for an insulation type AC / DC converter, which is characterized by having a waveform that is alternately repeated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10489296A JPH09294373A (en) | 1996-04-25 | 1996-04-25 | Snubber circuit of insulation type ac/dc conversion device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10489296A JPH09294373A (en) | 1996-04-25 | 1996-04-25 | Snubber circuit of insulation type ac/dc conversion device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH09294373A true JPH09294373A (en) | 1997-11-11 |
Family
ID=14392821
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10489296A Pending JPH09294373A (en) | 1996-04-25 | 1996-04-25 | Snubber circuit of insulation type ac/dc conversion device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH09294373A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006271076A (en) * | 2005-03-23 | 2006-10-05 | Fuji Electric Systems Co Ltd | Dc-dc converter |
| CN107613611A (en) * | 2017-09-28 | 2018-01-19 | 周安平 | Alternating current and direct current automatic switchover LED |
| JP2020120578A (en) * | 2016-04-04 | 2020-08-06 | 東芝キヤリア株式会社 | Electric power unit |
| CN112219346A (en) * | 2018-04-11 | 2021-01-12 | 航天喷气发动机洛克达因股份有限公司 | Power converter including a recirculation buffer |
-
1996
- 1996-04-25 JP JP10489296A patent/JPH09294373A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006271076A (en) * | 2005-03-23 | 2006-10-05 | Fuji Electric Systems Co Ltd | Dc-dc converter |
| JP4701771B2 (en) * | 2005-03-23 | 2011-06-15 | 富士電機システムズ株式会社 | DC / DC converter |
| JP2020120578A (en) * | 2016-04-04 | 2020-08-06 | 東芝キヤリア株式会社 | Electric power unit |
| CN107613611A (en) * | 2017-09-28 | 2018-01-19 | 周安平 | Alternating current and direct current automatic switchover LED |
| CN107613611B (en) * | 2017-09-28 | 2023-10-27 | 周安平 | AC/DC automatic switching LED lamp |
| CN112219346A (en) * | 2018-04-11 | 2021-01-12 | 航天喷气发动机洛克达因股份有限公司 | Power converter including a recirculation buffer |
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