JP3246159B2 - DC-AC converter - Google Patents

DC-AC converter

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Publication number
JP3246159B2
JP3246159B2 JP01243594A JP1243594A JP3246159B2 JP 3246159 B2 JP3246159 B2 JP 3246159B2 JP 01243594 A JP01243594 A JP 01243594A JP 1243594 A JP1243594 A JP 1243594A JP 3246159 B2 JP3246159 B2 JP 3246159B2
Authority
JP
Japan
Prior art keywords
circuit
series
switching element
transformer
connection point
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
JP01243594A
Other languages
Japanese (ja)
Other versions
JPH07222463A (en
Inventor
一男 黒木
久 藤本
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.)
Fuji Electric Co Ltd
Original Assignee
Fuji Electric Co 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 Fuji Electric Co Ltd filed Critical Fuji Electric Co Ltd
Priority to JP01243594A priority Critical patent/JP3246159B2/en
Publication of JPH07222463A publication Critical patent/JPH07222463A/en
Application granted granted Critical
Publication of JP3246159B2 publication Critical patent/JP3246159B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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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
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

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  • Control Of Voltage And Current In General (AREA)
  • Power Conversion In General (AREA)
  • Inverter Devices (AREA)

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【０００１】[0001]

【産業上の利用分野】この発明は、直流電源から絶縁さ
れた交流電源を作る直流−交流変換装置（いわゆるイン
バータ回路）の構成に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a DC-AC converter (so-called inverter circuit) for producing an AC power supply insulated from a DC power supply.

【０００２】[0002]

【従来の技術】従来例として、図３にフルブリッジ形イ
ンバータの回路構成を、図４にプッシュプル形インバー
タの回路構成をそれぞれ示す。これらの図において、Ｐ
は正電源（＋）、Ｎは負電源（−）、Ｓ１〜Ｓ４はトラ
ンジスタ，絶縁ゲートバイポーラ形トランジスタ（ＩＧ
ＢＴ），ＦＥＴ等の自己消弧可能な素子からなるスイッ
チング素子、Ｄ１〜Ｄ４はダイオード、２はトランス
（Ｔｒ）、３はスナバ回路で、双方とも、直流電源から
絶縁された交流電源を作るものである。2. Description of the Related Art As a conventional example, FIG. 3 shows a circuit configuration of a full-bridge type inverter, and FIG. 4 shows a circuit configuration of a push-pull type inverter. In these figures, P
Is a positive power supply (+), N is a negative power supply (-), S1 to S4 are transistors, and insulated gate bipolar transistors (IG
BT), switching elements composed of self-extinguishing elements such as FETs, D1 to D4 are diodes, 2 is a transformer (Tr), and 3 is a snubber circuit, both of which make an AC power supply insulated from a DC power supply. It is.

【０００３】図３に示すフルブリッジ形インバータで
は、トランス２に対しては半導体スイッチＳ１およびＳ
４を点弧することで正方向に励磁し、Ｓ２およびＳ３を
点弧することで負方向に励磁する。主回路構成素子数は
４個であり、また、主回路電流の通流素子数は２個であ
る。スナバ回路３としてはＲＣＤ（抵抗，コンデンサ，
ダイオード）スナバが利用可能である。In the full-bridge inverter shown in FIG. 3, semiconductor switches S1 and S1
4 is fired in the positive direction, and S2 and S3 are fired in the negative direction. The number of elements constituting the main circuit is four, and the number of elements conducting the main circuit current is two. As the snubber circuit 3, RCD (resistor, capacitor,
Diode) snubbers are available.

【０００４】一方、図４に示すプッシュプル形インバー
タでは、トランス２を半導体スイッチＳ２を点弧するこ
とで正方向に励磁し、Ｓ１を点弧することで負方向に励
磁する。主回路構成素子数は２個であり、また通流素子
数は１個となる。スナバ回路３は各素子に個々に必要と
なるとともに、別途スナバエネルギー回生回路が必要と
なる。On the other hand, in the push-pull inverter shown in FIG. 4, the transformer 2 is excited in the positive direction by firing the semiconductor switch S2, and is excited in the negative direction by firing S1. The number of main circuit components is two, and the number of conducting elements is one. The snubber circuit 3 is required individually for each element, and a separate snubber energy regeneration circuit is required.

【０００５】[0005]

【発明が解決しようとする課題】以上のように、フルブ
リッジ形インバータでは構成が簡単で、しかもクランプ
形であるため充放電スナバに比べてスナバ発生損失は少
なくて済むが、通流素子がプッシュプル形の２倍となり
素子発生損失が大きくなる。一方、フルブリッジ形イン
バータでは素子の発生損失は少なくなるが、スナバ回路
の構成が複雑になる、という問題がある。したがって、
この発明の課題は回路構成を簡単にし、低損失化を図る
ことにある。As described above, the full-bridge type inverter has a simple configuration and is of a clamp type, so that the snubber generation loss can be reduced as compared with the charging / discharging snubber, but the current-carrying element is pushed. It is twice as large as the pull type, and the element generation loss increases. On the other hand, in the full-bridge inverter, although the generation loss of the element is reduced, there is a problem that the configuration of the snubber circuit is complicated. Therefore,
An object of the present invention is to simplify the circuit configuration and reduce the loss.

【０００６】[0006]

【課題を解決するための手段】このような課題を解決す
るため、第１の発明では、スイッチング素子とダイオー
ドを逆並列接続してなるスイッチアームを直列接続して
構成される第１および第２の直列スイッチ回路を並列接
続した単相ブリッジ回路の、第１の並列接続点と第２の
並列接続点との間にスナバ回路を接続し、第１の並列接
続点には直流電源の正極を、第１の直列スイッチ回路の
直列接続点には中間タップ付き変圧器の一方の端子を、
第２の直列スイッチ回路の直列接続点には前記変圧器の
他方の端子を、またこの変圧器の中間タップには直流電
源の負極を、それぞれ接続し、第１の直列スイッチ回路
の上アーム側スイッチング素子をオンする期間に第２の
直列スイッチ回路の下アーム側スイッチング素子をオン
させ、第２の直列スイッチ回路の上アーム側スイッチン
グ素子をオンする期間に第１の直列スイッチ回路の下ア
ーム側スイッチング素子をオンさせることにより、各ス
イッチング素子がオフしたときに発生するスナバエネル
ギーを放電させるようにしたことを特徴としている。According to a first aspect of the present invention, there is provided a first and second switch arms each having a switching element and a diode connected in anti-parallel and connected in series. A snubber circuit is connected between a first parallel connection point and a second parallel connection point of a single-phase bridge circuit in which the series switch circuits are connected in parallel, and a positive electrode of a DC power supply is connected to the first parallel connection point. , One terminal of the transformer with an intermediate tap is connected to the series connection point of the first series switch circuit,
The other terminal of the transformer is connected to the series connection point of the second series switch circuit, and the negative terminal of the DC power supply is connected to the intermediate tap of the transformer, and the upper arm side of the first series switch circuit is connected. The lower-arm side switching element of the second series switch circuit is turned on during a period in which the switching element is turned on, and the lower arm side of the first series switch circuit is turned on in a period in which the upper-arm switching element of the second series switch circuit is turned on. By turning on the switching elements, snubber energy generated when each switching element is turned off is discharged.

【０００７】第２の発明では、スイッチング素子とダイ
オードを逆並列接続してなるスイッチアームを直列接続
して構成される第１および第２の直列スイッチ回路を並
列接続した単相ブリッジ回路の、第１の並列接続点と第
２の並列接続点との間にスナバ回路を接続し、第１の並
列接続点には直流電源の負極を、第１の直列スイッチ回
路の直列接続点には中間タップ付き変圧器の一方の端子
を、第２の直列スイッチ回路の直列接続点にはこの変圧
器の他方の端子を、またこの変圧器の中間タップには直
流電源の正極を、それぞれ接続し、第１の直列スイッチ
回路の下アーム側スイッチング素子をオンする期間に第
２の直列スイッチ回路の上アーム側スイッチング素子を
オンさせ、第２の直列スイッチ回路の下アーム側スイッ
チング素子をオンする期間に第１の直列スイッチ回路の
上アーム側スイッチング素子をオンさせることにより、
各スイッチング素子がオフしたときに発生するスナバエ
ネルギーを放電させるようにしたことを特徴としてい
る。According to a second aspect of the present invention, there is provided a single-phase bridge circuit in which first and second series switch circuits configured by connecting in series a switch arm formed by connecting a switching element and a diode in antiparallel are connected. A snubber circuit is connected between the first parallel connection point and the second parallel connection point, a negative terminal of a DC power supply is connected to the first parallel connection point, and an intermediate tap is connected to the series connection point of the first series switch circuit. One terminal of the transformer, the other terminal of the transformer to the series connection point of the second series switch circuit, and the positive terminal of the DC power supply to the intermediate tap of the transformer, respectively. The upper arm switching element of the second series switch circuit is turned on while the lower arm switching element of the first series switch circuit is turned on, and the lower arm switching element of the second series switch circuit is turned on. Period by turning on the arm side switching element on the first series switch circuit that,
A snubber energy generated when each switching element is turned off is discharged.

【０００８】[0008]

【作用】直流電源から絶縁された交流電源を作るに当た
り、スイッチング素子とダイオードの逆並列回路を直列
接続して構成される一般的な直列スイッチ回路と、中間
タップ付きトランスとを用いることにより、主回路電流
の通流素子を１つとし、主回路素子の発生損失を低減す
る。また、直列スイッチ回路の一方のスイッチアームを
スナバ放電用として用いることでＲＣＤスナバの利用を
可能とし、スナバ回路の簡素化を図る。In making an AC power supply insulated from a DC power supply, a general series switch circuit configured by connecting an anti-parallel circuit of a switching element and a diode in series and a transformer with an intermediate tap are used. The current flowing element of the circuit current is reduced to one to reduce the generation loss of the main circuit element. Further, by using one switch arm of the series switch circuit for snubber discharge, it is possible to use an RCD snubber, and to simplify the snubber circuit.

【０００９】[0009]

【実施例】図１はこの発明の実施例を示す回路図であ
る。すなわち、スイッチング素子（Ｓ１〜Ｓ４）とダイ
オード（Ｄ１〜Ｄ４）を逆並列接続してなるスイッチア
ームを、直列接続して構成した直列スイッチ回路１１，
１２を２組並列接続して単相プリッジ回路１を形成し、
この単相プリッジ回路１の一方の並列接続点と他方の並
列接続点との間にスナバ回路３を接続する。また、一方
の並列接続点には直流電源の正極Ｐ（＋）を、第１の直
列スイッチ回路の直列接続点には中間タップ付き変圧器
２の一方の端子を、第２の直列スイッチ回路の直列接続
点には同じ変圧器２の他方の端子を、また、同じ変圧器
２の中間タップＯには直流電源の負極Ｎ（−）をそれぞ
れ接続して構成される。FIG. 1 is a circuit diagram showing an embodiment of the present invention. That is, a series switch circuit 11, which is configured by connecting in series a switch arm formed by connecting switching elements (S1 to S4) and diodes (D1 to D4) in antiparallel,
12 are connected in parallel to form a single-phase bridge circuit 1,
A snubber circuit 3 is connected between one parallel connection point of the single-phase bridge circuit 1 and the other parallel connection point. The positive terminal P (+) of the DC power supply is connected to one parallel connection point, the one terminal of the transformer 2 with an intermediate tap is connected to the series connection point of the first series switch circuit, and the second series switch circuit The other terminal of the same transformer 2 is connected to the series connection point, and the intermediate tap O of the same transformer 2 is connected to the negative electrode N (−) of the DC power supply.

【００１０】ここで、図１の交流出力動作について説明
する。出力端子ｕ，ｖへの交流出力電圧発生は、スイッ
チング素子Ｓ１またはＳ３を点弧することにより行な
う。例えば、スイッチング素子Ｓ１を点弧すると、トラ
ンス２の一次端子Ｕは直流電源のＰ（＋）に、同じく中
間端子Ｏは直流電源のＮ（−）に接続されるためトラン
ス２は正に励磁され、出力端子ｕ，ｖ間には（＋）電圧
が発生する。一方、スイッチング素子Ｓ３を点弧する
と、トランス２の一次端子Ｖは直流電源のＰ（＋）に、
同じく中間端子Ｏは直流電源のＮ（−）に接続されるた
めトランス２は負に励磁され、出力端子ｕ，ｖ間には
（−）電圧が発生することになる。Here, the AC output operation of FIG. 1 will be described. The generation of the AC output voltage to the output terminals u and v is performed by firing the switching element S1 or S3. For example, when the switching element S1 is fired, the primary terminal U of the transformer 2 is connected to P (+) of the DC power supply, and the intermediate terminal O is connected to N (-) of the DC power supply, so that the transformer 2 is excited positively. , A (+) voltage is generated between the output terminals u and v. On the other hand, when the switching element S3 is ignited, the primary terminal V of the transformer 2 becomes P (+) of the DC power supply,
Similarly, since the intermediate terminal O is connected to the DC power supply N (-), the transformer 2 is negatively excited, and a (-) voltage is generated between the output terminals u and v.

【００１１】次に、図１におけるスナバ放電動作につい
て説明する。スナバ放電は、スイッチング素子Ｓ２また
はＳ４の点弧によって行なう。例えば、Ｓ１点弧による
正励磁の期間にＳ４を点弧すると、スナバ回路３の両端
の電圧は端子Ｐ，Ｎ間電圧の２倍となる。そして、スイ
ッチング素子のオフ時にスナバ回路３に吸収されたスナ
バエネルギーがＳ１，トランス２の一次端子Ｕ，Ｖおよ
びＳ４を通って放電する。これに対し、Ｓ３点弧による
負励磁の期間にＳ２を点弧すると、スナバ回路３の両端
の電圧は上記と同様端子Ｐ，Ｎ間電圧の２倍となる。そ
して、スイッチング素子のオフ時にスナバ回路３に吸収
されたスナバエネルギーがＳ３，トランス２の一次端子
Ｕ，ＶおよびＳ２を通って放電することになる。Next, the snubber discharge operation in FIG. 1 will be described. The snubber discharge is performed by firing the switching element S2 or S4. For example, if S4 is fired during the period of positive excitation by firing S1, the voltage across snubber circuit 3 will be twice the voltage between terminals P and N. Then, when the switching element is turned off, the snubber energy absorbed by the snubber circuit 3 is discharged through S1, the primary terminals U, V and S4 of the transformer 2. On the other hand, when S2 is fired during the period of negative excitation by firing S3, the voltage across snubber circuit 3 is twice the voltage between terminals P and N as described above. Then, when the switching element is turned off, the snubber energy absorbed by the snubber circuit 3 is discharged through S3, the primary terminals U, V and S2 of the transformer 2.

【００１２】図２はこの発明の他の実施例を示す回路図
である。すなわち、スイッチング素子（Ｓ１〜Ｓ４）と
ダイオード（Ｄ１〜Ｄ４）を逆並列接続してなるスイッ
チアームを、直列接続して構成した直列スイッチ回路１
１，１２を２組並列接続して単相プリッジ回路１を形成
し、この単相プリッジ回路１の一方の並列接続点と他方
の並列接続点との間にスナバ回路３を接続する。また、
一方の並列接続点には直流電源の負極Ｎ（−）を、第１
の直列スイッチ回路の直列接続点には中間タップ付き変
圧器２の一方の端子を、第２の直列スイッチ回路の直列
接続点には同じ変圧器２の他方の端子を、また、同じ変
圧器２の中間タップＯには直流電源の正極Ｐ（＋）をそ
れぞれ接続して構成される。FIG. 2 is a circuit diagram showing another embodiment of the present invention. That is, a series switch circuit 1 configured by connecting in series a switch arm formed by connecting switching elements (S1 to S4) and diodes (D1 to D4) in antiparallel.
The single-phase bridge circuit 1 is formed by connecting two sets of 1 and 12 in parallel, and the snubber circuit 3 is connected between one parallel connection point of the single-phase bridge circuit 1 and the other parallel connection point. Also,
The negative connection N (-) of the DC power supply is connected to one of the parallel connection points.
, The other terminal of the same transformer 2 is connected to the series connection point of the second series switch circuit, and the other terminal of the same transformer 2 is connected to the series connection point of the second series switch circuit. Are connected to a positive pole P (+) of a DC power supply, respectively.

【００１３】図２の交流出力動作について説明する。出
力端子ｕ，ｖへの交流出力電圧発生は、スイッチング素
子Ｓ２またはＳ４を点弧することにより行なう。例え
ば、スイッチング素子Ｓ２を点弧すると、トランス２の
一次端子Ｕは直流電源のＮ（−）に、同じく中間端子Ｏ
は直流電源のＰ（＋）に接続されるためトランス２は負
に励磁され、出力端子ｕ，ｖ間には（−）電圧が発生す
る。一方、スイッチング素子Ｓ４を点弧すると、トラン
ス２の一次端子Ｖは直流電源のＮ（−）に、同じく中間
端子Ｏは直流電源のＰ（＋）に接続されるためトランス
２は正に励磁され、出力端子ｕ，ｖ間には（＋）電圧が
発生することになる。The AC output operation of FIG. 2 will be described. The generation of the AC output voltage to the output terminals u and v is performed by firing the switching element S2 or S4. For example, when the switching element S2 is ignited, the primary terminal U of the transformer 2 is connected to N (-) of the DC power supply, and the intermediate terminal O is also connected.
Is connected to P (+) of the DC power supply, the transformer 2 is negatively excited, and a (-) voltage is generated between the output terminals u and v. On the other hand, when the switching element S4 is ignited, the primary terminal V of the transformer 2 is connected to N (-) of the DC power supply, and the intermediate terminal O is connected to P (+) of the DC power supply, so that the transformer 2 is positively excited. , A (+) voltage is generated between the output terminals u and v.

【００１４】次に、図２のスナバ放電動作について説明
する。スナバ放電は、スイッチング素子Ｓ１またはＳ３
の点弧によって行なう。例えば、Ｓ２点弧による負励磁
の期間にＳ３を点弧すると、スナバ回路３の両端の電圧
は端子Ｐ，Ｎ間電圧の２倍となる。そして、スイッチン
グ素子のオフ時にスナバ回路３に吸収されたスナバエネ
ルギーがＳ３，トランス２の一次端子Ｖ，ＵおよびＳ２
を通って放電する。これに対し、Ｓ４点弧による正励磁
の期間にＳ１を点弧すると、スナバ回路３の両端の電圧
は上記と同様端子Ｐ，Ｎ間電圧の２倍となる。そして、
スイッチング素子のオフ時にスナバ回路３に吸収された
スナバエネルギーがＳ１，トランス２の一次端子Ｕ，Ｖ
およびＳ４を通って放電することになる。Next, the snubber discharge operation of FIG. 2 will be described. The snubber discharge is caused by the switching element S1 or S3
It is performed by the ignition of For example, when S3 is fired during the negative excitation by S2 firing, the voltage across snubber circuit 3 is twice the voltage between terminals P and N. Then, the snubber energy absorbed in the snubber circuit 3 when the switching element is turned off is S3, the primary terminals V, U and S2 of the transformer 2.
Discharge through. On the other hand, when S1 is ignited during the period of positive excitation by S4 ignition, the voltage across snubber circuit 3 is twice the voltage between terminals P and N, as described above. And
The snubber energy absorbed by the snubber circuit 3 when the switching element is turned off is S1, the primary terminals U and V of the transformer 2.
And S4.

【００１５】[0015]

【発明の効果】この発明によれば、一般的な直列スイッ
チ回路と中間タップ付きトランスとを用いるだけで、素
子損失がフルブリッジ形回路の１／２で、しかもスナバ
回生回路を必要としない、小型で低損失のインバータ回
路を提供し得るという利点が得られる。According to the present invention, the element loss is one half that of the full-bridge type circuit and the snubber regeneration circuit is not required only by using a general series switch circuit and a transformer with an intermediate tap. The advantage is that a small and low-loss inverter circuit can be provided.

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

【図１】この発明の実施例を示す回路図である。FIG. 1 is a circuit diagram showing an embodiment of the present invention.

【図２】この発明の他の実施例を示す回路図である。FIG. 2 is a circuit diagram showing another embodiment of the present invention.

【図３】従来例を示す回路図である。FIG. 3 is a circuit diagram showing a conventional example.

【図４】別の従来例を示す回路図である。FIG. 4 is a circuit diagram showing another conventional example.

【符号の説明】[Explanation of symbols]

１…単相インバータ回路、２（Ｔｒ）…トランス、３…
スナバ回路、Ｐ…正電源（＋）、Ｎ…負電源（−）、Ｓ
１〜Ｓ４…半導体スイッチ、Ｄ１〜Ｄ４…ダイオード、
Ｏ…中間タップ、ｕ，ｖ…出力端子。1: Single-phase inverter circuit, 2 (Tr): Transformer, 3 ...
Snubber circuit, P: positive power supply (+), N: negative power supply (-), S
1 to S4: semiconductor switch, D1 to D4: diode,
O: middle tap, u, v: output terminals.

───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) H02M 7/5387 G05F 1/10 H02M 1/06 ──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. 7 , DB name) H02M 7/5387 G05F 1/10 H02M 1/06

Claims (2)

(57)【特許請求の範囲】(57) [Claims] 【請求項１】スイッチング素子とダイオードを逆並列接
続してなるスイッチアームを直列接続して構成される第
１および第２の直列スイッチ回路を並列接続した単相ブ
リッジ回路の、第１の並列接続点と第２の並列接続点と
の間にスナバ回路を接続し、第１の並列接続点には直流
電源の正極を、第１の直列スイッチ回路の直列接続点に
は中間タップ付き変圧器の一方の端子を、第２の直列ス
イッチ回路の直列接続点には前記変圧器の他方の端子
を、またこの変圧器の中間タップには直流電源の負極
を、それぞれ接続し、 第１の直列スイッチ回路の上アーム側スイッチング素子
をオンする期間に第２の直列スイッチ回路の下アーム側
スイッチング素子をオンさせ、 第２の直列スイッチ回路の上アーム側スイッチング素子
をオンする期間に第１の直列スイッチ回路の下アーム側
スイッチング素子をオンさせることにより、各スイッチ
ング素子がオフしたときに発生するスナバエネルギーを
放電させるようにしたことを特徴とする直流−交流変換
装置。1. A first parallel connection of a single-phase bridge circuit in which first and second series switch circuits configured by connecting in series a switch arm formed by connecting a switching element and a diode in antiparallel are connected in series. A snubber circuit is connected between the point and the second parallel connection point, the first parallel connection point is connected to the positive terminal of the DC power supply, and the first connection point of the series switch circuit is connected to a transformer with an intermediate tap. One terminal is connected to the series connection point of the second series switch circuit, and the other terminal of the transformer is connected to the intermediate tap of the transformer, and the negative terminal of the DC power supply is connected to the intermediate tap of the transformer. The lower arm switching element of the second series switch circuit is turned on during a period in which the upper arm switching element of the circuit is turned on, and the first arm is turned on in a period in which the upper arm switching element of the second series switch circuit is turned on. By turning on the lower arm switching elements of the series switching circuits, each switching element is characterized in that so as to discharge the snubber energy that occurs when turning off the DC - AC converter. 【請求項２】スイッチング素子とダイオードを逆並列接
続してなるスイッチアームを直列接続して構成される第
１および第２の直列スイッチ回路を並列接続した単相ブ
リッジ回路の、第１の並列接続点と第２の並列接続点と
の間にスナバ回路を接続し、第２の並列接続点には直流
電源の負極を、第１の直列スイッチ回路の直列接続点に
は中間タップ付き変圧器の一方の端子を、第２の直列ス
イッチ回路の直列接続点にはこの変圧器の他方の端子
を、またこの変圧器の中間タップには直流電源の正極
を、それぞれ接続し、 第１の直列スイッチ回路の下アーム側スイッチング素子
をオンする期間に第２の直列スイッチ回路の上アーム側
スイッチング素子をオンさせ、 第２の直列スイッチ回路の下アーム側スイッチング素子
をオンする期間に第１の直列スイッチ回路の上アーム側
スイッチング素子をオンさせることにより、各スイッチ
ング素子がオフしたときに発生するスナバエネルギーを
放電させるようにしたことを特徴とする直流−交流変換
装置。2. A first parallel connection of a single-phase bridge circuit in which first and second series switch circuits configured by connecting in series a switch arm formed by connecting a switching element and a diode in anti-parallel are connected in parallel. A snubber circuit is connected between the point and the second parallel connection point, a negative electrode of a DC power supply is connected to the second parallel connection point, and a transformer with an intermediate tap is connected to the series connection point of the first series switch circuit. One terminal is connected to the series connection point of the second series switch circuit, and the other terminal of the transformer is connected to an intermediate tap of the transformer, and the positive terminal of the DC power supply is connected to the intermediate tap of the transformer. The upper arm switching element of the second series switch circuit is turned on while the lower arm switching element of the circuit is turned on, and the first arm is turned on while the lower arm switching element of the second series switch circuit is turned on. By turning on the arm side switching element on the series switching circuits, each switching element is characterized in that so as to discharge the snubber energy that occurs when turning off the DC - AC converter.
JP01243594A 1994-02-04 1994-02-04 DC-AC converter Expired - Fee Related JP3246159B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP01243594A JP3246159B2 (en) 1994-02-04 1994-02-04 DC-AC converter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP01243594A JP3246159B2 (en) 1994-02-04 1994-02-04 DC-AC converter

Publications (2)

Publication Number Publication Date
JPH07222463A JPH07222463A (en) 1995-08-18
JP3246159B2 true JP3246159B2 (en) 2002-01-15

Family

ID=11805222

Family Applications (1)

Application Number Title Priority Date Filing Date
JP01243594A Expired - Fee Related JP3246159B2 (en) 1994-02-04 1994-02-04 DC-AC converter

Country Status (1)

Country Link
JP (1) JP3246159B2 (en)

Also Published As

Publication number Publication date
JPH07222463A (en) 1995-08-18

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