JPS63157673A - Suppression of leakage current for dc-dc converter - Google Patents

Suppression of leakage current for dc-dc converter

Info

Publication number
JPS63157673A
JPS63157673A JP30370286A JP30370286A JPS63157673A JP S63157673 A JPS63157673 A JP S63157673A JP 30370286 A JP30370286 A JP 30370286A JP 30370286 A JP30370286 A JP 30370286A JP S63157673 A JPS63157673 A JP S63157673A
Authority
JP
Japan
Prior art keywords
converter
switching element
leakage current
circuit
phase
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
JP30370286A
Other languages
Japanese (ja)
Inventor
Toshihiko Mizukami
俊彦 水上
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP30370286A priority Critical patent/JPS63157673A/en
Publication of JPS63157673A publication Critical patent/JPS63157673A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE:To improve profitability and reliability, by inverting the phase alternately to generate the negative pulse to a switching element in case the other switching element generates the positive pulse in a coincident cycle. CONSTITUTION:A leakage current suppression circuit is equipped with a DC-DC converter 1 and a DC-DC converter 2 of identical rated output, each of which is composed of switching elements 3-6, transformers 7-8, a rectification- smoothing circuit 10, a drive circuit 11, a pulse modulation circuit 12, and a feedback amplification circuit 13. When the switching elements 3 and 6 generate positive pulses in a coincident cycle on one hand with two DC-DC converters 1-2 of this identical output power connected in parallel to balance the output power, the switching elements 5 and 4 on the other generate negative pulses, operating so as to invert the phase alternately. The current with complementary phase is thereby generated, so that the leakage current can be set off.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、低電圧で、かつ、大電力を要する装置の電源
部を構成するDC−DCコンバータの漏洩電流抑制方法
に関し、特に、接地線の漏洩電流を低く、かつ、安全な
値にすることを可能とするDC−DCコンバータの漏洩
電流抑制方法に関する。
[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for suppressing leakage current of a DC-DC converter that constitutes a power supply section of a device that requires low voltage and high power, and in particular, The present invention relates to a method for suppressing leakage current of a DC-DC converter, which makes it possible to reduce leakage current to a low and safe value.

〔従来技術〕[Prior art]

電子計算機の論理素子に必要な電力は、低電圧であり、
その電源に対しては、低電圧、かつ大電力であることが
要求されるため、それらの装置におけるDC−DCコン
バータの使用個数の増加に伴い、DC−DCコンバータ
で構成される電源部の線路フィルタのコンデンサ、およ
び浮遊容量に起因して生じる漏洩電流の抑制が重要とな
っている。
The power required for logic elements in electronic computers is low voltage;
Since the power source is required to have low voltage and high power, as the number of DC-DC converters used in these devices increases, the line of the power supply section consisting of DC-DC converters is increasing. It is important to suppress leakage current caused by filter capacitors and stray capacitance.

例えば、特開昭58−28812号公報に記載されてい
る方法では、計算機、および、その他の電気装置におけ
る接地線の漏れ電流が、はぼ一定であることに基づいて
、漏洩電流と同等の値と、相補的な位相とを有する電流
を、接地線に生じさせる回路を付加することにより、緑
地線の漏洩電流を低く、かつ、安全な値にしている。
For example, in the method described in Japanese Unexamined Patent Publication No. 58-28812, a value equivalent to the leakage current is calculated based on the fact that the leakage current of the grounding wire in computers and other electrical devices is approximately constant. By adding a circuit that generates a current having a complementary phase in the ground wire, the leakage current in the green wire is kept at a low and safe value.

〔問題が解決しようとする問題点〕[The problem that the problem is trying to solve]

上記従来技術では、1対1の変圧比を有する単巻変圧器
、および、その電気装置の線路と大地間キャパシタンス
に等しいキャパシタンスを設ける必要があるため、接地
の漏洩電流が、その電気装置の消費電力により、変化す
るような電源システムの漏洩電流については、補償され
ないという問題があった。
In the above conventional technology, it is necessary to provide an autotransformer with a 1:1 transformation ratio and a capacitance equal to the capacitance between the line of the electrical device and the ground, so that the ground leakage current increases the consumption of the electrical device. There is a problem in that the leakage current of the power supply system, which changes depending on the electric power, is not compensated for.

本発明の目的は、このような問題点を改善し、接地の漏
洩電流が、その電気装置の消費電力により、変化する電
源システムにおいても、容易に漏洩電流を抑制すること
ができるDC−DCコンバータの漏洩電流抑制方法を提
供することにある。
An object of the present invention is to provide a DC-DC converter that can improve such problems and easily suppress leakage current even in a power supply system where the leakage current of the ground changes depending on the power consumption of the electrical device. An object of the present invention is to provide a method for suppressing leakage current.

〔問題を解決するための手段〕[Means to solve the problem]

上記目的を達成するため、本発明のDC−DCコンバー
タの漏洩電流抑制方法は、DC−DCコンバータを並列
運転して、そのDC−DCコンバータの直流電圧を、ス
イッチング素子で高周波交流に変換し、さらに、変圧器
で変圧した後、整流回路で整流し、平滑回路で平滑して
直流電圧を得るDC−DC変換装置において、一致した
周期により、一方のスイッチング素子が正のパルスを発
生する場合、他方は、負のパルスを発生し、それらのス
イッチング素子は、交互に位相を反転させることに特徴
がある。
In order to achieve the above object, the method for suppressing leakage current of a DC-DC converter of the present invention operates the DC-DC converters in parallel, converts the DC voltage of the DC-DC converter into high-frequency AC using a switching element, Furthermore, in a DC-DC conversion device that obtains a DC voltage by transforming the voltage with a transformer, rectifying it with a rectifier circuit, and smoothing it with a smoothing circuit, when one switching element generates a positive pulse due to the matched period, The other type generates negative pulses and their switching elements are characterized by alternating phase inversions.

〔作  用〕[For production]

本発明においては、同一の出力電力のDC−DCコンバ
ータを2個並列に接続し、かつ、出力電力をバランスさ
せ、一致した周期で、一方のスイッチング素子が正のパ
ルスを発生するとき、他方のスイッチング素子は負のパ
ルスを発生し、交互に位相を反転する様に動作する。
In the present invention, two DC-DC converters with the same output power are connected in parallel, the output powers are balanced, and when one switching element generates a positive pulse with the same period, the other switching element generates a positive pulse. The switching element generates negative pulses and operates to alternately invert the phase.

このため、それらのDC−DCコンバータは。For this reason, those DC-DC converters.

個々の漏洩電流と同等の値で、相補的な位相を有する電
流を接地線に生じさせ、漏洩電流を相殺することができ
る。
A current having a value and a complementary phase to each leakage current can be generated in the ground wire to cancel the leakage current.

〔実施例〕〔Example〕

以下、本発明の一実施例を図面により詳細に説明する。 Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.

第1図は、本発明の一実施例における漏洩電流抑制回路
の構成図、第2図は本発明の一実施例における電圧波形
の説明図である。
FIG. 1 is a block diagram of a leakage current suppression circuit in an embodiment of the present invention, and FIG. 2 is an explanatory diagram of voltage waveforms in an embodiment of the present invention.

本実施例の漏洩電流抑制回路は、第1図のように、DC
−DCコンバータ1.および、そのDC−、DCコンバ
ータlと同一定格出力のDC−DCコンバータ2を備え
、それらは、スイッチング素子3〜6.トランス7.8
.!1流平滑回路10゜駆動回路11.パルス変調回路
12.帰還増幅口w113を備え、また、浮遊容量9を
有する。
As shown in FIG. 1, the leakage current suppression circuit of this embodiment has a DC
-DC converter 1. and a DC-DC converter 2 having the same rated output as that DC-, DC converter 1, which includes switching elements 3 to 6. Trance 7.8
.. ! 1st flow smoothing circuit 10° drive circuit 11. Pulse modulation circuit 12. It is provided with a feedback amplification port w113, and also has a stray capacitance 9.

スイッチング素子3のベース端子は、スイッチング素子
6のベース端子と同一位相の駆動回路11に接続され、
スイッチング素子5のベース端子は、スイッチング素子
4のベース端子と同一位相の駆動回路11に接続される
The base terminal of the switching element 3 is connected to the drive circuit 11 in the same phase as the base terminal of the switching element 6,
The base terminal of the switching element 5 is connected to the drive circuit 11 having the same phase as the base terminal of the switching element 4 .

このような構成により、まず、DC−DCコンバータ1
のスイッチング素子5と、DC−DCコンバータ2のス
イッチング素子4とをONL、次に、スイッチング素子
5.および4をOFFとして、さらに、DC−DCコン
バータ1のスイッチング素子3と、DC−DCコンバー
タ2のスイッチング素子6とをONL、次に、スイッチ
ング素子3.および6をOFFする。
With such a configuration, first, the DC-DC converter 1
The switching element 5 of the DC-DC converter 2 and the switching element 4 of the DC-DC converter 2 are connected ONL, and then the switching element 5. and 4 are turned OFF, and then switching element 3 of DC-DC converter 1 and switching element 6 of DC-DC converter 2 are turned ON, and then switching element 3 . and 6 is turned off.

この場合、DC−DCコンバータ1のトランス7には、
第2図のように、V、の電圧が誘起され、同時に、DC
−DCコンバータ2のトランス8には、vbの電圧が誘
起される。従って、DC−DCコンバータ1におけるV
αの電圧により、浮遊容量9を流れる漏洩電流と、DC
−DCコンバータ2におけるVbの電圧により、浮遊容
量9を流れる漏洩電流とは、180度位相が異なり、相
補的な位相を有するため、それらの漏洩電流の合成電流
は相殺される。
In this case, the transformer 7 of the DC-DC converter 1 has
As shown in Figure 2, a voltage of V is induced, and at the same time DC
- A voltage of vb is induced in the transformer 8 of the DC converter 2. Therefore, V in the DC-DC converter 1
Due to the voltage α, the leakage current flowing through the stray capacitance 9 and the DC
- Due to the voltage Vb in the DC converter 2, the leakage current flowing through the stray capacitance 9 has a phase different from that of the leakage current by 180 degrees and has a complementary phase, so that the combined current of these leakage currents is canceled out.

〔発明の効果〕〔Effect of the invention〕

本発明によれば、複雑な漏洩電流抑制回路を付加するこ
となく、簡便、かつ容易に漏洩電流を抑制することがで
きるため、経済性を損うことなく、そのシステムの信頼
性を向上することが可能である。
According to the present invention, it is possible to simply and easily suppress leakage current without adding a complicated leakage current suppression circuit, thereby improving the reliability of the system without sacrificing economic efficiency. is possible.

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

第1図は本発明の一実施例における漏洩電流抑制回路、
第2図は本発明の一実施例における電圧波形の説明図で
ある。 1.2:DC−DCコンバータ、3〜6:スイツチング
素子、7.8ニドランス、9:浮遊容量。 10:整流平滑回路、11:駆動回路、12:パルス変
調回路、13:帰還増幅回路1 vIi、Vb ニドラ
ンスに誘起される電圧の波形。
FIG. 1 shows a leakage current suppression circuit in an embodiment of the present invention.
FIG. 2 is an explanatory diagram of voltage waveforms in one embodiment of the present invention. 1.2: DC-DC converter, 3 to 6: switching element, 7.8 Nidorance, 9: Stray capacitance. 10: Rectifier and smoothing circuit, 11: Drive circuit, 12: Pulse modulation circuit, 13: Feedback amplifier circuit 1 vIi, Vb Waveform of voltage induced in Nidorance.

Claims (1)

【特許請求の範囲】[Claims] 1、DC−DCコンバータを並列運転し、直流電圧を該
DC−DCコンバータのスイッチング素子により高周波
交流に変換し、該高周波交流を変圧器により変圧した後
、整流回路により整流し、平滑回路により平滑して、直
流電圧を得るDC−DC変換装置において、上記DC−
DCコンバータの一方のスイッチング素子が発生する正
のパルスと、他方のスイッチング素子が発生する負のパ
ルスとを同期させ、該一方のスイッチング素子が正のパ
ルスを発生すると、該他方のスイッチング素子は負のパ
ルスを発生し、該スイッチング素子が発生するパルスは
、交互に位相を反転することを特徴とするDC−DCコ
ンバータの漏洩電流抑制方法。
1. DC-DC converters are operated in parallel, DC voltage is converted to high-frequency alternating current by the switching element of the DC-DC converter, the high-frequency alternating current is transformed by a transformer, then rectified by a rectifier circuit, and smoothed by a smoothing circuit. In the DC-DC converter for obtaining a DC voltage, the DC-
The positive pulse generated by one switching element of the DC converter is synchronized with the negative pulse generated by the other switching element, and when the one switching element generates a positive pulse, the other switching element becomes negative. A leakage current suppression method for a DC-DC converter, characterized in that the pulses generated by the switching element are alternately inverted in phase.
JP30370286A 1986-12-22 1986-12-22 Suppression of leakage current for dc-dc converter Pending JPS63157673A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP30370286A JPS63157673A (en) 1986-12-22 1986-12-22 Suppression of leakage current for dc-dc converter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP30370286A JPS63157673A (en) 1986-12-22 1986-12-22 Suppression of leakage current for dc-dc converter

Publications (1)

Publication Number Publication Date
JPS63157673A true JPS63157673A (en) 1988-06-30

Family

ID=17924217

Family Applications (1)

Application Number Title Priority Date Filing Date
JP30370286A Pending JPS63157673A (en) 1986-12-22 1986-12-22 Suppression of leakage current for dc-dc converter

Country Status (1)

Country Link
JP (1) JPS63157673A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012249441A (en) * 2011-05-27 2012-12-13 Fuji Electric Co Ltd Power conversion device

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60113664A (en) * 1983-11-21 1985-06-20 Tdk Corp Power source
JPS62185560A (en) * 1986-02-10 1987-08-13 Toshiba Corp Dc/dc converter

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60113664A (en) * 1983-11-21 1985-06-20 Tdk Corp Power source
JPS62185560A (en) * 1986-02-10 1987-08-13 Toshiba Corp Dc/dc converter

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012249441A (en) * 2011-05-27 2012-12-13 Fuji Electric Co Ltd Power conversion device

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