JPH1127856A - Power supply protector - Google Patents

Power supply protector

Info

Publication number
JPH1127856A
JPH1127856A JP19053197A JP19053197A JPH1127856A JP H1127856 A JPH1127856 A JP H1127856A JP 19053197 A JP19053197 A JP 19053197A JP 19053197 A JP19053197 A JP 19053197A JP H1127856 A JPH1127856 A JP H1127856A
Authority
JP
Japan
Prior art keywords
varistor
power supply
line
voltage
line filter
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
JP19053197A
Other languages
Japanese (ja)
Inventor
Nobuyuki Inoue
信之 井上
Yasuki Takeda
泰樹 武田
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.)
Noritz Corp
Original Assignee
Noritz 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 Noritz Corp filed Critical Noritz Corp
Priority to JP19053197A priority Critical patent/JPH1127856A/en
Publication of JPH1127856A publication Critical patent/JPH1127856A/en
Pending legal-status Critical Current

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  • Thermistors And Varistors (AREA)
  • Emergency Protection Circuit Devices (AREA)

Abstract

PROBLEM TO BE SOLVED: To constitute a power supply protective circuit without using a varistor having an especially high voltage by connecting a first varistor in parallel with an AC power supply, connecting a second varistor between one end thereof and the earth and connecting a third varistor across a line filter. SOLUTION: A line filter L1 for removing noise is connected with a feeder line between an AC power supply 2 for a power supply protector 1 and the load side, a capacitor C1 for removing noise is connected between the feeder line and the earth, a varistor ZR1 is connected in parallel with the AC power supply 2 and one end thereof is connected through a varistor ZR2 with the earth. Furthermore, a varistor ZR3 is connected across the line filter L1. When a high voltage, e.g. a lightning surge, is applied to the feeder line, the surge voltage is clamped by the varistors ZR1, ZR2 in order to protect the next stage circuit and the resonance surge voltage due to the line filter L1 and the capacitor C1 is suppressed by the varistor ZR3.

Description

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

【発明の属する技術分野】本発明は、例えば雷などによ
り高電圧が印加された場合に保護するための電源保護装
置に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply protection device for protecting a high voltage from being applied due to, for example, lightning.

【0002】[0002]

【従来の技術】従来この種の技術としては、例えば図2
に示すような電源保護装置が存在する。図2に示す電源
保護装置10は、交流電源11と負荷側との電源ライン
にノイズ除去用ACラインフィルタとしてのコイルL1
1が接続されると共に、その電源ラインとアース側との
間にノイズ除去用コンデンサC11が接続されている。
そして、交流電源11と並列にバリスタZR11が接続
されると共に、一端はバリスタZR12を通してアース
側に接続されている。また、ノイズ除去用ACラインフ
ィルタL11の負荷側の一端はバリスタZR13を通し
てアース側に接続されている。
2. Description of the Related Art Conventionally, as this kind of technology, for example, FIG.
A power supply protection device as shown in FIG. A power supply protection device 10 shown in FIG.
1 and a noise removing capacitor C11 is connected between the power supply line and the ground side.
A varistor ZR11 is connected in parallel with the AC power supply 11, and one end is connected to the ground through a varistor ZR12. The load-side end of the noise removal AC line filter L11 is connected to the ground through a varistor ZR13.

【0003】このように構成することにより、電源側に
雷サージ等の高電圧が印加された場合には、バリスタZ
R11及びバリスタZR12で規定される電圧(V1)
に落とされ、電源ライン、更にはその負荷回路が保護さ
れるようになっている。なお、ここでバリスタとは、非
線形の抵抗素子で高い電圧が印加された場合に抵抗が小
さくなる電気素子である。
With this configuration, when a high voltage such as a lightning surge is applied to the power supply, the varistor Z
Voltage (V1) specified by R11 and varistor ZR12
So that the power supply line and its load circuit are protected. Here, the varistor is an electric element which is a non-linear resistance element and whose resistance decreases when a high voltage is applied.

【0004】[0004]

【発明が解決しようとする課題】従来このような電源保
護回路があるものの、従来のものでは次のような問題が
生じていた。図3を用いて説明すると、従来のもので
は、図3(a)に示すような電源側に雷サージ等の高電
圧が印加された場合には、バリスタZR11及びZR1
2で規定される電圧(V1)にクランプして落とされる
ようになっている(図3(b))が、電源ラインのノイ
ズ除去にほとんどの場合、必須なノイズ除去用フィルタ
L11、C11の存在により、図3(c)に示すような
L11とC11との共振により2次的に発生するサージ
電圧(V2 −V1 )が発生する。これによりバリスタZ
R11、ZR12のクランプ電圧以上の電圧が次段回路
に加わる。このため、バリスタZR13のバリスタ電圧
をバリスタZR12のバリスタ電圧よりも更に高く設定
する必要があるが、非常に高い電圧に対応するバリスタ
が要求されるため、非常に高価であると共に大きなもの
が必然的に要求されるという問題があった。
Although such a power supply protection circuit has conventionally been provided, the conventional one has the following problems. With reference to FIG. 3, in the conventional device, when a high voltage such as a lightning surge is applied to the power supply side as shown in FIG. 3A, the varistors ZR11 and ZR1 are applied.
2 is clamped to the voltage (V1) defined in FIG. 2 (FIG. 3B). However, in most cases, noise removal filters L11 and C11 are indispensable for noise removal of the power supply line. As a result, a surge voltage (V 2 −V 1 ) which is generated secondarily due to resonance between L11 and C11 as shown in FIG. 3C is generated. This allows the varistor Z
A voltage higher than the clamp voltage of R11 and ZR12 is applied to the next stage circuit. For this reason, the varistor voltage of the varistor ZR13 needs to be set higher than the varistor voltage of the varistor ZR12. However, since a varistor corresponding to a very high voltage is required, a very expensive and large one is inevitable. There was a problem that was required.

【0005】そこで、本発明は上述の問題的に鑑みてな
されたものであって、従来のような非常に高い電圧が要
求されるバリスタを使用することなく実現した電源保護
装置の提供を目的とする。
Accordingly, the present invention has been made in view of the above-mentioned problems, and has as its object to provide a power supply protection device realized without using a varistor requiring a very high voltage as in the prior art. I do.

【0006】[0006]

【課題を解決するための手段】請求項1記載の発明は、
交流電源と、前記交流電源と並列に接続された第1のバ
リスタZR1と、前記第1のバリスタZR1の一端側と
アースライン側との間に接続された第2のバリスタZR
2と、前記交流電源と負荷側との間に接続されて電源供
給ラインのノイズを除去するラインフィルタL1と、前
記電源ラインの一方のラインであって前記ラインフィル
タL1の前後に各端子をそれぞれ接続した第3のバリス
タZR3と、から構成される。請求項1記載の発明によ
れば、第3のバリスタZR3を低い電圧のバリスタで利
用できるので、小型化を実現できると共に、特別なバリ
スタを使用せず安価で実現できる。
According to the first aspect of the present invention,
An AC power supply; a first varistor ZR1 connected in parallel with the AC power supply; and a second varistor ZR connected between one end of the first varistor ZR1 and the ground line.
2, a line filter L1 connected between the AC power supply and the load side for removing noise from a power supply line, and one terminal of one of the power supply lines before and after the line filter L1, respectively. And a third varistor ZR3 connected thereto. According to the first aspect of the present invention, since the third varistor ZR3 can be used as a low-voltage varistor, the size can be reduced, and the varistor can be realized at low cost without using a special varistor.

【0007】[0007]

【発明の実施の形態】以下、本発明の電源保護装置を図
面を参照して具体的に説明する。図1が本発明の電源保
護装置の具体的な回路図である。図1に示すように、本
発明の電源保護装置1は、交流電源2と負荷側との電源
ラインにノイズ除去用ACラインフィルタとしてのコイ
ルL1が接続されると共に、その電源ラインとアース側
との間にノイズ除去用コンデンサC1が接続されてい
る。そして、交流電源2と並列にバリスタZR1が接続
されると共に、一端はバリスタZR2を通してアース側
に接続されている。そして、更にバリスタZR3は、電
源ラインのバリスタZR2が接続されている側であっ
て、ACラインフィルタL1の両端に接続されるように
構成されている。
DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a power supply protection device according to the present invention will be specifically described with reference to the drawings. FIG. 1 is a specific circuit diagram of the power supply protection device of the present invention. As shown in FIG. 1, in a power supply protection device 1 of the present invention, a coil L1 as an AC line filter for noise removal is connected to a power supply line between an AC power supply 2 and a load side, and the power supply line is connected to a ground side. Is connected to the noise removing capacitor C1. The varistor ZR1 is connected in parallel with the AC power supply 2, and one end is connected to the ground through the varistor ZR2. Further, the varistor ZR3 is configured to be connected to both ends of the AC line filter L1 on the side of the power supply line to which the varistor ZR2 is connected.

【0008】このように構成することにより、電源ライ
ンとアース間に雷サージ等の高電圧が印加された場合に
は、まずバリスタZR1及びZR2によってサージ電圧
をクランプし、次段の回路(あるいは部品)を保護す
る。このような場合、通常スイッチング電源等の電源回
路に用いるノイズ除去用のラインフィルタ(L1、C
1)が入っている場合が多く、雷サージの影響によりL
1、C1が共振し、2次的にサージ電圧が発生する。そ
して、バリスタZR3がこの共振サージ電圧を抑制する
のである。
With this configuration, when a high voltage such as a lightning surge is applied between the power supply line and the ground, the surge voltage is first clamped by the varistors ZR1 and ZR2, and the circuit (or component) in the next stage is applied. ) To protect. In such a case, a noise removing line filter (L1, C2) normally used in a power supply circuit such as a switching power supply.
1) is often included, and L
1, C1 resonates and a secondary surge voltage is generated. Then, the varistor ZR3 suppresses the resonance surge voltage.

【0009】一例を挙げると、図2の従来回路では、例
えばバリスタZR12のバリスタ電圧を1200V程度
のものを使用した場合には、バリスタZR13のバリス
タ電圧は1600V〜1800V程度のものが必要とな
る。一方、図1の電源保護装置においては、同様にバリ
スタZR2のバリスタ電圧を1200V程度のものを使
用した場合には、バリスタZR3のバリスタ電圧は40
0〜600V程度のものの使用で実現できるようにな
る。なお、これらの数値は一例を示したものであり、電
源回路に用いる他の素子の定数が異なればそれに応じて
異なり、電源ラインに用いるコードの種類、アース回路
の状態によって異なるのはもちろんのことである。
For example, in the conventional circuit shown in FIG. 2, for example, when a varistor voltage of the varistor ZR12 is about 1200V, a varistor voltage of the varistor ZR13 needs to be about 1600V to 1800V. On the other hand, in the power supply protection device shown in FIG. 1, when the varistor voltage of the varistor ZR2 is about 1200 V, the varistor voltage of the varistor ZR3 is 40
It can be realized by using a device of about 0 to 600V. Note that these numerical values are only examples, and will vary depending on the constants of other elements used in the power supply circuit, and will of course depend on the type of cord used in the power supply line and the state of the ground circuit. It is.

【0010】[0010]

【発明の効果】以上説明したように本発明の電源保護装
置では、特別に高い電圧のバリスタを使用することなく
電源の保護回路を実現するようにしたので、特別なバリ
スタを使用することなく、小型で安価なものを利用する
ことができるため、電源保護装置全体として小型で安価
に実現することができる効果がある。
As described above, in the power supply protection device of the present invention, a power supply protection circuit is realized without using a special high voltage varistor, so that no special varistor is used. Since a small and inexpensive device can be used, there is an effect that the whole power supply protection device can be realized at a small size and at low cost.

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

【図1】本発明の電源保護装置の具体的構成図である。FIG. 1 is a specific configuration diagram of a power supply protection device of the present invention.

【図2】従来例の説明図である。FIG. 2 is an explanatory diagram of a conventional example.

【図3】各主要部の波形図である。FIG. 3 is a waveform chart of each main part.

【符号の説明】[Explanation of symbols]

1 電源保護装置 2 交流電源 ZR1 バリスタ ZR2 バリスタ ZR3 バリスタ L1 ノイズ除去用フィルタ C1 ノイズ除去用コンデンサ DESCRIPTION OF SYMBOLS 1 Power supply protection device 2 AC power supply ZR1 Varistor ZR2 Varistor ZR3 Varistor L1 Noise removal filter C1 Noise removal capacitor

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 交流電源と、前記交流電源と並列に接続
された第1のバリスタZR1と、前記第1のバリスタZ
R1の一端側とアースライン側との間に接続された第2
のバリスタZR2と、前記交流電源と負荷側との間に接
続されて電源供給ラインのノイズを除去するラインフィ
ルタL1と、前記電源ラインの一方のラインであって前
記ラインフィルタL1の前後に各端子をそれぞれ接続し
た第3のバリスタZR3と、を具備したことを特徴とす
る電源保護装置。 【0001】
1. An AC power supply, a first varistor ZR1 connected in parallel with the AC power supply, and the first varistor Z
A second terminal connected between one end of R1 and the ground line.
A varistor ZR2, a line filter L1 connected between the AC power supply and the load side for removing noise on a power supply line, and one terminal of the power supply line before and after the line filter L1. And a third varistor ZR3 respectively connected to the power supply protection device. [0001]
JP19053197A 1997-06-30 1997-06-30 Power supply protector Pending JPH1127856A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP19053197A JPH1127856A (en) 1997-06-30 1997-06-30 Power supply protector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP19053197A JPH1127856A (en) 1997-06-30 1997-06-30 Power supply protector

Publications (1)

Publication Number Publication Date
JPH1127856A true JPH1127856A (en) 1999-01-29

Family

ID=16259646

Family Applications (1)

Application Number Title Priority Date Filing Date
JP19053197A Pending JPH1127856A (en) 1997-06-30 1997-06-30 Power supply protector

Country Status (1)

Country Link
JP (1) JPH1127856A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100750530B1 (en) 2006-01-27 2007-08-20 주식회사 엘씨케이전자 Surge Protector
KR100900913B1 (en) 2007-06-11 2009-06-03 조경준 Device for Defence Surge of Dual Processing in Sources of Electricity
KR101040215B1 (en) * 2010-11-11 2011-06-09 (주) 이미지라이트 Street light having function of surge protection
WO2012067342A1 (en) * 2010-11-18 2012-05-24 주식회사 그라운드 Lightning protection apparatus using tn-c common ground
EP3171475A1 (en) * 2015-11-20 2017-05-24 Mitsubishi Heavy Industries, Ltd. Power supply protector and air-conditoning system including the same, and method for manufacturing power supply protector

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100750530B1 (en) 2006-01-27 2007-08-20 주식회사 엘씨케이전자 Surge Protector
KR100900913B1 (en) 2007-06-11 2009-06-03 조경준 Device for Defence Surge of Dual Processing in Sources of Electricity
KR101040215B1 (en) * 2010-11-11 2011-06-09 (주) 이미지라이트 Street light having function of surge protection
WO2012067342A1 (en) * 2010-11-18 2012-05-24 주식회사 그라운드 Lightning protection apparatus using tn-c common ground
EP3171475A1 (en) * 2015-11-20 2017-05-24 Mitsubishi Heavy Industries, Ltd. Power supply protector and air-conditoning system including the same, and method for manufacturing power supply protector

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