JPH05300753A - Snubber circuit of switching circuit - Google Patents

Snubber circuit of switching circuit

Info

Publication number
JPH05300753A
JPH05300753A JP4129460A JP12946092A JPH05300753A JP H05300753 A JPH05300753 A JP H05300753A JP 4129460 A JP4129460 A JP 4129460A JP 12946092 A JP12946092 A JP 12946092A JP H05300753 A JPH05300753 A JP H05300753A
Authority
JP
Japan
Prior art keywords
capacitor
circuit
switching element
switching
turned
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
Application number
JP4129460A
Other languages
Japanese (ja)
Other versions
JP2604668B2 (en
Inventor
Tetsuji Kitamura
徹二 北村
Isami Norikoshi
勇美 乗越
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.)
MELS CORP
Original Assignee
MELS CORP
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 MELS CORP filed Critical MELS CORP
Priority to JP4129460A priority Critical patent/JP2604668B2/en
Publication of JPH05300753A publication Critical patent/JPH05300753A/en
Application granted granted Critical
Publication of JP2604668B2 publication Critical patent/JP2604668B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Landscapes

  • Dc-Dc Converters (AREA)
  • Power Conversion In General (AREA)
  • Inverter Devices (AREA)

Abstract

PURPOSE:To materialize high frequency operation with little power loss and without lowering efficiency. CONSTITUTION:A snubber circuit 24 consists of a series circuit of the first and second capacitors 25 and 26 and a diode 27 parallel with the second capacitor 26, and the first capacitor 25 is larger than the second capacitor 26, preferably, two times as large as it, and a switching element 13 is the snubber circuit of the switching circuit consisting of a switching circuit where frequency is made high frequency of 100KHz or higher, using MOS-FET. The instant the switching element 13 is turned off, the great energy of an inductor 12 is charged and absorbed in the first capacitor 25 as in the past. The instant the switching element 13 is turned on, the charge of the first capacitor 25 is discharged through the second capacitor 26, and the total capacity becomes small, and the shifting of the charge is a little, and the charge is released without loss.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、スイッチングレギュレ
ータなどのスイッチング回路において、スイッチング素
子がターンオフした瞬間の急激な電圧の上昇を防ぐとと
もに、ターンオンしたときの電力損失を可能な限り無く
すようにしたスイッチング回路のスナバー回路に関する
ものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switching circuit, such as a switching regulator, which prevents a sudden increase in voltage at the moment when a switching element is turned off, and eliminates power loss when turned on as much as possible. It relates to a snubber circuit of a circuit.

【0002】[0002]

【従来の技術】図4に示すような、直流電源端子10、
11との間に、トランス、負荷などのインダクタ12と
MOS−FETなどのスイッチング素子13とを直列に
接続したスイッチング回路において、前記スイッチング
素子13の両端間に、このスイッチング素子13のオ
ン、オフ時の特性の改善のため、スナバ回路14が接続
される。このスナバ回路14は、従来は、主にフォワー
ドタイプのインバータでは、抵抗15とコンデンサ16
とを直列に接続するとともに、抵抗15と並列にダイオ
ード17を接続してなるものが用いられていた。
2. Description of the Related Art As shown in FIG.
In a switching circuit in which an inductor 12 such as a transformer or a load and a switching element 13 such as a MOS-FET are connected in series between the switching element 13 and the switching element 11, when the switching element 13 is turned on or off. The snubber circuit 14 is connected to improve the characteristics of the. Conventionally, the snubber circuit 14 is mainly composed of a resistor 15 and a capacitor 16 in a forward type inverter.
There is used one in which a diode 17 is connected in parallel with a resistor 15 while connecting and in series.

【0003】このようなスナバ回路14において、スイ
ッチング素子13がオフした瞬間、ダイオード17を介
してコンデンサ16に電流を流し、スイッチング素子1
3のD−S間の電圧Vdsの立上りを下げる。また、抵
抗15は、スイッチング素子13がオンした瞬間、コン
デンサ16の電荷を急速に放電し、MOS−FETなど
のスイッチング素子13のD(ドレイン)電流Idが上
昇し過ぎるのを防止する。
In such a snubber circuit 14, at the moment when the switching element 13 is turned off, a current is supplied to the capacitor 16 via the diode 17 and the switching element 1
The rise of the voltage Vds between D and S of 3 is lowered. Further, the resistor 15 rapidly discharges the electric charge of the capacitor 16 at the moment when the switching element 13 is turned on, and prevents the D (drain) current Id of the switching element 13 such as a MOS-FET from rising excessively.

【0004】[0004]

【発明が解決しようとする課題】回路中に、トランス、
負荷などのインダクタ12を有するものでは、特に、こ
のインダクタ12の大きなエネルギーが、スイッチング
素子13のオフした瞬間に急激にきわめて高電圧に跳ね
上がるが、この電圧はダイオード17を介してコンデン
サ16に充電して吸収される。このとき、跳ね上りの高
電圧がスイッチング素子13の耐圧を越えないようにす
るには、容量の大きなコンデンサ16を用いることが望
ましい。ところが、このコンデンサ16に容量の大きな
ものを用いると、スイッチング素子13のオンしたとき
に抵抗15で消費される電力が大きくなって無視できな
くなる。
In the circuit, the transformer,
In the case where the inductor 12 such as a load is used, in particular, a large amount of energy of the inductor 12 suddenly jumps to an extremely high voltage at the moment when the switching element 13 is turned off, but this voltage charges the capacitor 16 via the diode 17. Absorbed. At this time, it is desirable to use the capacitor 16 having a large capacitance in order to prevent the high voltage that jumps up from exceeding the withstand voltage of the switching element 13. However, if a capacitor having a large capacitance is used as the capacitor 16, the power consumed by the resistor 15 when the switching element 13 is turned on becomes large and cannot be ignored.

【0005】特に、スイッチング素子13としてMOS
−FETを用いて、100KHzから数MHzという高
周波数化された回路では、耐圧の目的からは、コンデン
サ16の容量は大きければ大きい程よいが、大きすぎる
と逆にMOS−FETなどのスイッチング素子13のオ
ンしたときに抵抗15で消費される電力が大きくなり、
高周波数化に対応できなくなるという問題があった。ち
なみに、スイッチング素子13のオン、オフ時のD(ド
レイン)電流Idと、D−S(ソース)間電圧Vdsと
の特性は、図3(d)に示すように、これらの交差時の
電圧vは、Vds=220ボルトとすると、v=90ボ
ルトにも達する。
In particular, a MOS is used as the switching element 13.
In a high frequency circuit of 100 kHz to several MHz using -FET, the larger the capacity of the capacitor 16 is, the better for the purpose of withstanding voltage. When turned on, the power consumed by the resistor 15 increases,
There was a problem that it could not cope with higher frequencies. Incidentally, the characteristics of the D (drain) current Id when the switching element 13 is on and off and the DS (source) voltage Vds are as shown in FIG. Will reach v = 90 volts, assuming Vds = 220 volts.

【0006】本発明は、電力損失が少なく、しかも、効
率を低下させることなく高周波数化ができるものを得る
ことを目的とするものである。
It is an object of the present invention to obtain a product which has a low power loss and can be made higher in frequency without lowering the efficiency.

【0007】[0007]

【課題を解決するための手段】本発明は、直流電源に、
インダクタ12とスイッチング素子13とを直列に接続
し、前記スイッチング素子13の両端に、並列にスナバ
回路24を接続してなるスイッチング回路において、前
記スナバ回路24は、第1コンデンサ25(C1)と第
2コンデンサ26(C2)の直列回路と、他方の第2コ
ンデンサ26と並列のダイオード27とからなり、第1
コンデンサ25(C1)>第2コンデンサ26(C
2)、好ましくは、C1≒2×C2とし、スイッチング
素子13は、MOS−FETを用い、100KHz以上
の高周波数化したスイッチング回路からなるスイッチン
グ回路のスナバー回路である。
The present invention provides a DC power supply,
In a switching circuit in which an inductor 12 and a switching element 13 are connected in series, and a snubber circuit 24 is connected in parallel to both ends of the switching element 13, the snubber circuit 24 includes a first capacitor 25 (C1) and a first capacitor 25 (C1). A series circuit of two capacitors 26 (C2) and a diode 27 in parallel with the other second capacitor 26.
Capacitor 25 (C1)> Second capacitor 26 (C
2), preferably C1≈2 × C2, and the switching element 13 is a snubber circuit of a switching circuit including a switching circuit using a MOS-FET and having a high frequency of 100 KHz or more.

【0008】[0008]

【作用】トランス、負荷などのインダクタ12の大きな
エネルギーが、スイッチング素子13のオフした瞬間
に、急激にきわめて高電圧に跳ね上がるので、この電圧
がダイオード27を介して第1コンデンサ25に充電し
て吸収される。スイッチング素子13がオフからオンし
た瞬間、第1コンデンサ25、第2コンデンサ26、ス
イッチング素子13、第1コンデンサ25の閉回路が形
成されて、第1コンデンサ25の電荷を第2コンデンサ
26を通り放電するので、損失なしで充電電荷が放出さ
れる。
The large energy of the inductor 12, such as the transformer and the load, suddenly jumps to an extremely high voltage at the moment when the switching element 13 is turned off, and this voltage is charged in the first capacitor 25 via the diode 27 and absorbed. To be done. At the moment when the switching element 13 is turned on, the closed circuit of the first capacitor 25, the second capacitor 26, the switching element 13 and the first capacitor 25 is formed, and the electric charge of the first capacitor 25 is discharged through the second capacitor 26. As a result, the charge is discharged without loss.

【0009】[0009]

【実施例】以下、本発明の実施例を図面に基づき説明す
る。図1において、交流電源28は、整流回路29を介
して直流電源端子10、11に接続され、この直流電源
端子10、11間には、トランス、負荷などのインダク
タ12の1次巻線30と、MOS−FETなどのスイッ
チング素子13とが直列に接続されている。前記インダ
クタ12の補助巻線32の一端には、スイッチング素子
18を介して直流電源端子10に接続され、また、補助
巻線32の他端には、クランプコンデンサ19とダイオ
ード22とが接続されている。前記スイッチング素子1
3とスイッチング素子18のG(ゲート)には、スイッ
チング制御回路23が接続されている。
Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, an AC power supply 28 is connected to DC power supply terminals 10 and 11 via a rectifier circuit 29, and between the DC power supply terminals 10 and 11 is a primary winding 30 of an inductor 12 such as a transformer or a load. , And a switching element 13 such as a MOS-FET are connected in series. One end of the auxiliary winding 32 of the inductor 12 is connected to the DC power supply terminal 10 via the switching element 18, and the other end of the auxiliary winding 32 is connected to the clamp capacitor 19 and the diode 22. There is. The switching element 1
A switching control circuit 23 is connected to G and the G (gate) of the switching element 18.

【0010】前記スイッチング素子13のD(ドレイ
ン)−S(ソース)間には、本発明によるスナバ回路2
4が並列に接続されている。このスナバ回路24は、第
1コンデンサ25(容量C1)と第2コンデンサ26
(容量C2)との直列回路と、他方の第2コンデンサ2
6と並列なダイオード27とからなる。このスナバ回路
24における第1コンデンサ25(C1)と第2コンデ
ンサ26(C2)との容量の比は、C1≒2×C2 で
あるときが最も特性が優れている。その特性データにつ
いては後述する。なお、20は出力端子、21は出力端
子、31は2次巻線である。
The snubber circuit 2 according to the present invention is provided between D (drain) and S (source) of the switching element 13.
4 are connected in parallel. The snubber circuit 24 includes a first capacitor 25 (capacity C1) and a second capacitor 26.
A series circuit with (capacitance C2) and the other second capacitor 2
6 and a diode 27 in parallel. The characteristics of the snubber circuit 24 are best when the capacitance ratio of the first capacitor 25 (C1) and the second capacitor 26 (C2) is C1≈2 × C2. The characteristic data will be described later. 20 is an output terminal, 21 is an output terminal, and 31 is a secondary winding.

【0011】以上のような構成における動作を説明す
る。 A.スイッチング素子13がオンからオフした瞬間 このときの動作は、図4に示した従来と同様、スイッチ
ング素子13がオフした瞬間、スナバ回路24のダイオ
ード27を介して第1コンデンサ25に電流を流し、ス
イッチング素子13のD−S間の電圧Vdsの立上りを
下げる。すなわち、トランス、負荷などのインダクタ1
2の大きなエネルギーが、スイッチング素子13のオフ
した瞬間に急激にきわめて高電圧に跳ね上がるので、こ
の電圧Vdsがダイオード27を介して第1コンデンサ
25に充電して吸収される。なお、この場合、第1コン
デンサ25の容量C1が大きければ大きい程、電圧Vd
sの立上り(dVds/dt)がゆるやかになる。
The operation of the above configuration will be described. A. At the moment when the switching element 13 is turned off, the operation at this time is the same as in the conventional case shown in FIG. 4. At the moment when the switching element 13 is turned off, a current flows through the first capacitor 25 via the diode 27 of the snubber circuit 24, The rise of the voltage Vds between D and S of the switching element 13 is lowered. That is, an inductor 1 such as a transformer or a load
The large energy of 2 suddenly jumps to a very high voltage at the moment when the switching element 13 is turned off, and this voltage Vds is charged in the first capacitor 25 via the diode 27 and absorbed. In this case, the larger the capacitance C1 of the first capacitor 25, the greater the voltage Vd.
The rise of s (dVds / dt) becomes gentle.

【0012】B.スイッチング素子13がオフからオン
した瞬間 スイッチング素子18がオフした後、わかずかなタイム
ラグをもってスイッチング素子13がオンする。する
と、第1コンデンサ25、第2コンデンサ26、スイッ
チング素子13、第1コンデンサ25の閉回路が形成さ
れて、第1コンデンサ25の電荷を放電する。このと
き、第1、第2コンデンサ25、26の直列回路の容量
Cは C=1/(1/C1+1/C2)=C1・C2/(C1+C2) となり、総容量は少なくなる。また、図1において、ス
イッチング素子13のS側(C1の下端)の電圧をv
0、C1とC2の接続点の電圧をv1、スイッチング素
子13のD側(C2の上端)の電圧をv2とすると、V
dsの変化に対するC1の電圧Vc1変化が、従来回路
より充分小さく、したがって、少ない電荷の移動で済
み、損失なしで充電電荷が放出される。
B. The moment when the switching element 13 is turned on from the off state. After the switching element 18 is turned off, the switching element 13 is turned on with a slight time lag. Then, a closed circuit of the first capacitor 25, the second capacitor 26, the switching element 13, and the first capacitor 25 is formed, and the electric charge of the first capacitor 25 is discharged. At this time, the capacitance C of the series circuit of the first and second capacitors 25 and 26 becomes C = 1 / (1 / C1 + 1 / C2) = C1 · C2 / (C1 + C2), and the total capacitance decreases. In addition, in FIG. 1, the voltage on the S side of the switching element 13 (the lower end of C1) is represented by v
0, the voltage at the connection point of C1 and C2 is v1, and the voltage on the D side (upper end of C2) of the switching element 13 is v2.
The change of the voltage Vc1 of C1 with respect to the change of ds is sufficiently smaller than that of the conventional circuit, and therefore, less charge transfer is required, and the charged charge is discharged without loss.

【0013】前記第1コンデンサ25と第2コンデンサ
26の容量C1とC2との比が、本発明の最も優れた特
性となる場合について、図3により説明する。 図3(a):C1≒2×C2であるとき、スイッチング
素子13のオン、オフ時のD電流Idと、D−S間電圧
Vdsとの交差時の電圧vは、V=220ボルトとする
と、v≒20ボルトと、従来の約4分の1となり、スイ
ッチング素子13での消費電力は最も少なくなった。こ
のとき、Vc1はVdsの約2/3となった。なお、C
1≒2×C2であることが必須ではなく、少なくとも、
C1>C2であることが望ましい。ただし、C1≫C2
のように、C1が大きすぎると点線のように、電圧が大
きく振動するので好ましくない。 図3(b):C2=C1であるとき、交差時の電圧v
は、従来の約2分の1となり、この場合でもスイッチン
グ素子13での消費電力は、充分少なくなった。また、
Vc1はVdsの約1/2となった。 図3(c):C1<C2であるとき、すなわち、C1が
小さいと、dVds/dtが急激に立ち上がるので、従
来の抵抗15の場合と同様消費電力は、大きくなった。 図3(d):従来の回路による特性を示し、電流と電圧
の交差する電圧v値が高く、スイッチング素子13で無
駄な電力を消費していることを示している。
A case where the ratio of the capacitances C1 and C2 of the first capacitor 25 and the second capacitor 26 is the most excellent characteristic of the present invention will be described with reference to FIG. FIG. 3A: When C1≈2 × C2, the voltage v at the time when the D current Id when the switching element 13 is turned on and off and the D-S voltage Vds is V = 220 volts. , V≈20 V, which is about 1/4 of the conventional value, and the power consumption of the switching element 13 is the smallest. At this time, Vc1 became about 2/3 of Vds. Note that C
It is not essential that 1≈2 × C2, and at least
It is desirable that C1> C2. However, C1 >> C2
As described above, when C1 is too large, the voltage vibrates greatly as indicated by the dotted line, which is not preferable. FIG. 3B: When C2 = C1, the voltage v at the time of crossing
Is about one half of the conventional value, and even in this case, the power consumption of the switching element 13 is sufficiently reduced. Also,
Vc1 became about 1/2 of Vds. FIG. 3C: When C1 <C2, that is, when C1 is small, dVds / dt rises sharply, so that the power consumption increases as in the case of the conventional resistor 15. FIG. 3D shows the characteristics of the conventional circuit, and shows that the voltage v value at which the current and the voltage intersect is high and that the switching element 13 consumes unnecessary power.

【0014】前記実施例では、スイッチング素子13
と、スイッチング素子18をそれぞれ1ずつ個用いた例
で説明したが、図2に示すように、スイッチング素子1
3と、スイッチング素子18をそれぞれ2個ずつ用いた
全波ブリッジ型の場合であってもそのまま適用できる。
In the above embodiment, the switching element 13
, And the example in which one switching element 18 is used, but as shown in FIG.
3 and the full-wave bridge type using two switching elements 18 can be applied as they are.

【0015】[0015]

【発明の効果】本発明は、上述のように構成したので、
MOS−FETなどのスイッチング素子13のオン時の
電圧の跳上りに対する過大な電圧ストレスの防止はもち
ろんのこと、スイッチング回路が高周波数化された場合
に特に問題となっていたスナバ回路14の抵抗による電
力損失がなく、従来回路に比較して、第1コンデンサ2
5のTanδでの損失だけとなり、効率が格段に良好で
ある。
Since the present invention is constructed as described above,
Not only the prevention of excessive voltage stress against the voltage jump when the switching element 13 such as a MOS-FET is turned on, but also the resistance of the snubber circuit 14 which has been a particular problem when the frequency of the switching circuit is increased. There is no power loss, and the first capacitor 2
Only the loss at Tan δ of 5 is shown, and the efficiency is remarkably good.

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

【図1】本発明によるスイッチング回路のスナバー回路
の第1実施例を示す電気回路図である。
FIG. 1 is an electric circuit diagram showing a first embodiment of a snubber circuit of a switching circuit according to the present invention.

【図2】本発明によるスイッチング回路のスナバー回路
の第2実施例を示す電気回路図である。
FIG. 2 is an electric circuit diagram showing a second embodiment of the snubber circuit of the switching circuit according to the present invention.

【図3】動作特性図である。FIG. 3 is an operation characteristic diagram.

【図4】従来のスイッチング回路のスナバー回路を示す
電気回路図である。である。
FIG. 4 is an electric circuit diagram showing a snubber circuit of a conventional switching circuit. Is.

【符号の説明】[Explanation of symbols]

10…直流電源端子、11…直流電源端子、12…トラ
ンス、負荷などのインダクタ、13…MOS−FETな
どのスイッチング素子、14…従来のスナバ回路、15
…抵抗、16…コンデンサ、17…ダイオード、18…
スイッチング素子、19…クランプコンデンサ、20…
出力端子、21…出力端子、22…ダイオード、23…
スイッチング制御回路、24…本発明のスナバ回路、2
5…第1コンデンサ、26…第2コンデンサ、27…ダ
イオード、28…交流電源、29…整流回路、30…1
次巻線、31…2次巻線、32…補助巻線。
10 ... DC power supply terminal, 11 ... DC power supply terminal, 12 ... Inductor such as transformer and load, 13 ... Switching element such as MOS-FET, 14 ... Conventional snubber circuit, 15
… Resistors, 16… Capacitors, 17… Diodes, 18…
Switching element, 19 ... Clamp capacitor, 20 ...
Output terminal, 21 ... Output terminal, 22 ... Diode, 23 ...
Switching control circuit, 24 ... Snubber circuit of the present invention, 2
5 ... 1st capacitor, 26 ... 2nd capacitor, 27 ... Diode, 28 ... AC power supply, 29 ... Rectifier circuit, 30 ... 1
Secondary winding, 31 ... Secondary winding, 32 ... Auxiliary winding.

Claims (3)

【特許請求の範囲】[Claims] 【請求項1】 直流電源に、インダクタ12とスイッチ
ング素子13とを直列に接続し、前記スイッチング素子
13の両端に、並列にスナバ回路24を接続してなるス
イッチング回路において、前記スナバ回路24は、第1
コンデンサ25(C1)と第2コンデンサ26(C2)
の直列回路と、他方の第2コンデンサ26と並列のダイ
オード27とからなることを特徴とするスイッチング回
路のスナバー回路。
1. A switching circuit in which an inductor 12 and a switching element 13 are connected in series to a DC power source, and a snubber circuit 24 is connected in parallel to both ends of the switching element 13, wherein the snubber circuit 24 is First
Capacitor 25 (C1) and second capacitor 26 (C2)
And a diode 27 in parallel with the second capacitor 26 of the other side, and a snubber circuit of a switching circuit.
【請求項2】 第1コンデンサ25(C1)>第2コン
デンサ26(C2)、好ましくは、C1≒2×C2とし
た請求項1記載のスイッチング回路のスナバー回路。
2. The snubber circuit of the switching circuit according to claim 1, wherein the first capacitor 25 (C1)> the second capacitor 26 (C2), preferably C1≈2 × C2.
【請求項3】 スイッチング素子13は、MOS−FE
Tを用い、100KHz以上の高周波数化したスイッチ
ング回路からなる請求項1記載のスイッチング回路のス
ナバー回路。
3. The switching element 13 is a MOS-FE.
The snubber circuit for a switching circuit according to claim 1, wherein the snubber circuit comprises a switching circuit using T and having a high frequency of 100 KHz or more.
JP4129460A 1992-04-22 1992-04-22 Switching circuit snubber circuit Expired - Fee Related JP2604668B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4129460A JP2604668B2 (en) 1992-04-22 1992-04-22 Switching circuit snubber circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4129460A JP2604668B2 (en) 1992-04-22 1992-04-22 Switching circuit snubber circuit

Publications (2)

Publication Number Publication Date
JPH05300753A true JPH05300753A (en) 1993-11-12
JP2604668B2 JP2604668B2 (en) 1997-04-30

Family

ID=15010044

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4129460A Expired - Fee Related JP2604668B2 (en) 1992-04-22 1992-04-22 Switching circuit snubber circuit

Country Status (1)

Country Link
JP (1) JP2604668B2 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000333439A (en) * 1999-05-21 2000-11-30 Toshiba Corp Snubber circuit and power converter
JP2006324839A (en) * 2005-05-18 2006-11-30 Fuji Electric Holdings Co Ltd Compound type semiconductor device
JP2007089292A (en) * 2005-09-21 2007-04-05 Fuji Electric Holdings Co Ltd Variation reduction method for voltage distribution by a plurality of voltage drive type semi-conductor devices connected in series

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63181025U (en) * 1987-05-13 1988-11-22

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63181025U (en) * 1987-05-13 1988-11-22

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000333439A (en) * 1999-05-21 2000-11-30 Toshiba Corp Snubber circuit and power converter
JP2006324839A (en) * 2005-05-18 2006-11-30 Fuji Electric Holdings Co Ltd Compound type semiconductor device
JP2007089292A (en) * 2005-09-21 2007-04-05 Fuji Electric Holdings Co Ltd Variation reduction method for voltage distribution by a plurality of voltage drive type semi-conductor devices connected in series

Also Published As

Publication number Publication date
JP2604668B2 (en) 1997-04-30

Similar Documents

Publication Publication Date Title
US5796598A (en) Voltage-converting circuit for the power supply of an electrical consumer of high output, particularly a bobbin winding machine
US5434768A (en) Fixed frequency converter switching at zero voltage
US6992902B2 (en) Full bridge converter with ZVS via AC feedback
US5448467A (en) Electrical power converter circuit
US6295211B1 (en) Switching power supply unit having delay circuit for reducing switching frequency
US7271505B1 (en) Voltage balancing in intermediate circuit capacitors
US7016205B2 (en) Ripple-current reduction schemes for AC converters
US5063488A (en) Switching power source means
US6867634B2 (en) Method for detecting the null current condition in a PWM driven inductor and a relative driving circuit
JPH113789A (en) Lighting circuit for discharge lamp
US4401902A (en) High frequency switching circuit
JPH05300753A (en) Snubber circuit of switching circuit
AU780394B2 (en) Synchronous rectifier circuit
US20020000923A1 (en) Switching power supply circuit
JP3493273B2 (en) Power factor improvement circuit of three-phase rectifier
JPH09312973A (en) Dc-dc converter
JP2003134827A (en) High power factor half-bridge type converter
JP3993704B2 (en) Active filter device
JP3306542B2 (en) Partially Resonant Self-Excited Switching Power Supply Low Loss Circuit
SU1737683A1 (en) Dc voltage converter
JPH114578A (en) Voltage converter device
JP2673996B2 (en) Inverter device
JP2962388B2 (en) Two-stone insulated switching power supply
JP3155882B2 (en) Switching regulator
JPH06111976A (en) Inverter device

Legal Events

Date Code Title Description
R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20080129

Year of fee payment: 11

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20090129

Year of fee payment: 12

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20100129

Year of fee payment: 13

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20100129

Year of fee payment: 13

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20110129

Year of fee payment: 14

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20110129

Year of fee payment: 14

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20120129

Year of fee payment: 15

LAPS Cancellation because of no payment of annual fees