JPH05291020A - Composite toroidal core for noise filter - Google Patents

Composite toroidal core for noise filter

Info

Publication number
JPH05291020A
JPH05291020A JP4093978A JP9397892A JPH05291020A JP H05291020 A JPH05291020 A JP H05291020A JP 4093978 A JP4093978 A JP 4093978A JP 9397892 A JP9397892 A JP 9397892A JP H05291020 A JPH05291020 A JP H05291020A
Authority
JP
Japan
Prior art keywords
noise
amorphous alloy
based amorphous
toroidal core
core
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.)
Withdrawn
Application number
JP4093978A
Other languages
Japanese (ja)
Inventor
Masahiro Fujikura
昌浩 藤倉
Wataru Ohashi
渡 大橋
Shun Sato
駿 佐藤
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.)
Nippon Steel Corp
Original Assignee
Nippon Steel 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 Nippon Steel Corp filed Critical Nippon Steel Corp
Priority to JP4093978A priority Critical patent/JPH05291020A/en
Publication of JPH05291020A publication Critical patent/JPH05291020A/en
Withdrawn legal-status Critical Current

Links

Landscapes

  • Soft Magnetic Materials (AREA)
  • Coils Or Transformers For Communication (AREA)

Abstract

PURPOSE:To simultaneously attenuate the noise of low voltage on a low-frequency zone and high voltage impulse noise in a highly efficient manner by a method wherein a toroidal core consisting of a Co-based amorphous alloy is assembled to a toroidal core consisting of an Fe-based amorphous alloy. CONSTITUTION:The composite toroidal core is the core formed by concentrically winding an Fe-based amorphous alloy thin band, having the saturated magnetic flux density of 1.4T or higher, and a Co-based amorphous ally band having the relative permeability of 2000 or higher in 1kHz and 5mmOe. The weight ratio of the Co-based amoprhous alloy thin film against the whole core is 1 to 20% and the toroidal core is used for a noise filter. Also, the toroidal core has the relative permeability of 5000 or higher in 1kHz and a 5mmOe in the compounded state, and the H80 representing DC superpositional characteristics of the relative permeability (1kHz, 1mmOe) becomes 10A/m or higher. As a result, the low voltage noise on a low frequency zone and high voltage impulse noise can be simultaneously attenuated in a highly efficient manner.

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、ノイズフィルタ用のト
ロイダルコアに関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a toroidal core for a noise filter.

【0002】[0002]

【従来の技術】近年、電子機器の発展に伴って、ノイズ
は大きな社会問題となってきている。ノイズの中で電源
ラインを経路とする伝導ノイズの対策には、コモンモー
ドチョークやノーマルモードチョーク等のノイズフィル
タが一般的に使われている。これらが対象とするノイズ
には、広い周波数帯に渡って発生する低電圧ノイズと、
偶発的に発生する高電圧インパルスノイズがある。
2. Description of the Related Art In recent years, noise has become a major social problem with the development of electronic devices. Noise filters such as a common mode choke and a normal mode choke are generally used as a countermeasure against the conduction noise that passes through the power supply line as a path. The noise targeted by these is low voltage noise generated over a wide frequency band,
There is accidental high-voltage impulse noise.

【0003】低電圧ノイズの減衰には高いインダクタン
スが必要であり、コア材に求められる特性は高い透磁率
である。コア材として、一般的には高透磁率フェライト
が用いられている。Co基非晶質合金は、低周波数帯域
では透磁率が非常に高く、低周波数帯域の用途には適し
ているが、コスト的に問題がある。
Attenuation of low voltage noise requires high inductance, and the characteristic required for the core material is high magnetic permeability. High-permeability ferrite is generally used as the core material. The Co-based amorphous alloy has a very high magnetic permeability in the low frequency band and is suitable for use in the low frequency band, but has a cost problem.

【0004】また、高電圧インパルスノイズの減衰には
コアの透磁率の直流重畳特性が優れていることが必要
(第15回日本応用磁気学会学術講演概要集1991年
364頁)であり、コア材には高い磁束密度と適切なB
−Hカーブの形が求められる。最近ではこの用途のコア
材として、飽和磁束密度の高いFe基非晶質合金に適当
な熱処理を加えたものが使われている。
Further, in order to attenuate high voltage impulse noise, it is necessary that the direct current superposition characteristics of the magnetic permeability of the core be excellent (15th Annual Meeting of the Applied Magnetics Society of Japan, Proceedings of Academic Lecture, 1991, p. 364). High magnetic flux density and proper B
-The shape of the H curve is required. Recently, as a core material for this purpose, an Fe-based amorphous alloy having a high saturation magnetic flux density and an appropriate heat treatment is used.

【0005】しかしながら現在まで、低電圧特に低周波
数帯域のノイズと、高電圧のインパルスノイズを同時に
効率良く減衰できるノイズフィルタは実用化されていな
い。即ち、低電圧ノイズの減衰に優れる高透磁率フェラ
イトやCo基非晶質合金は、飽和磁束密度が低く、イン
パルスノイズの減衰には劣る。また、インパルスノイズ
の減衰に優れるFe基非晶質合金は、透磁率が低く、低
電圧ノイズの減衰には劣る。
However, to date, no noise filter has been put into practical use which can efficiently attenuate low-voltage noise, particularly low-frequency band noise, and high-voltage impulse noise simultaneously. That is, the high magnetic permeability ferrite and the Co-based amorphous alloy, which are excellent in the attenuation of low voltage noise, have a low saturation magnetic flux density and are inferior in the attenuation of impulse noise. Further, the Fe-based amorphous alloy, which is excellent in the attenuation of impulse noise, has a low magnetic permeability and is inferior in the attenuation of low voltage noise.

【0006】[0006]

【発明が解決しようとする課題】本発明は、低周波数域
の低電圧ノイズと高電圧インパルスノイズを同時に効率
良く減衰できる、ノイズフィルタ用のトロイダルコアを
提供することを目的としている。
SUMMARY OF THE INVENTION It is an object of the present invention to provide a toroidal core for a noise filter which can efficiently attenuate low voltage noise and high voltage impulse noise in a low frequency range at the same time.

【0007】[0007]

【課題を解決するための手段・作用】本発明の要旨とす
るところは下記の通りである。
Means and Actions for Solving the Problems The gist of the present invention is as follows.

【0008】(1)飽和磁束密度1.4T以上のFe基
非晶質合金薄帯(X)と、1kHz ,5mOe における比透
磁率が20000以上のCo基非晶質合金薄帯(Y)を
同心に巻き回してなる複合トロイダルコアであって、コ
ア全体に対してCo基非晶質合金薄帯(Y)の重量割合
が1〜20%であることを特徴とする、低電圧ノイズ減
衰とインパルスノイズ減衰に優れるノイズフィルタ用複
合トロイダルコア。
(1) An Fe-based amorphous alloy ribbon (X) having a saturation magnetic flux density of 1.4 T or more and a Co-based amorphous alloy ribbon (Y) having a relative magnetic permeability of 20000 or more at 1 kHz and 5 mOe. A low voltage noise attenuation, which is a composite toroidal core wound concentrically, characterized in that the weight ratio of the Co-based amorphous alloy ribbon (Y) is 1 to 20% with respect to the entire core. A composite toroidal core for noise filters with excellent impulse noise attenuation.

【0009】(2)複合された状態で、1kHzm,5Oeに
おける比透磁率が5000以上、かつ比透磁率(1kHz
、1mOe)の直流重畳特性を表すH80が10A/m以上
となる上記(1)に記載のノイズフィルタ用複合トロイ
ダルコア。
(2) In the composite state, the relative permeability at 1 kHzm, 5 Oe is 5000 or more, and the relative permeability (1 kHz
1 mOe) The composite toroidal core for a noise filter according to the above (1), in which H 80 representing a DC superposition characteristic is 10 A / m or more.

【0010】ここでH80は、増分透磁率が、直流磁場を
印加していない時の透磁率の80%になる時の直流磁場
の値である。
Here, H 80 is the value of the DC magnetic field when the incremental magnetic permeability becomes 80% of the magnetic permeability when the DC magnetic field is not applied.

【0011】即ち本発明は、インパルスノイズ減衰に優
れるFe基非晶質合金からなるトロイダルコアに、低電
圧ノイズの減衰に優れるCo基非晶質合金からなるトロ
イダルコアを組み合わせることにより、低周波数域の低
電圧ノイズと、高電圧インパルスノイズを同時に、効率
良く減衰できるノイズフィルタ用のトロイダルコアを実
現したものである。
That is, according to the present invention, by combining a toroidal core made of a Fe-based amorphous alloy excellent in impulse noise attenuation with a toroidal core made of a Co-based amorphous alloy excellent in attenuation of low voltage noise, a low frequency range is obtained. It is a realization of a toroidal core for a noise filter that can efficiently attenuate low voltage noise and high voltage impulse noise at the same time.

【0012】以下に本発明を詳細に説明する。The present invention will be described in detail below.

【0013】本発明は、Fe基非晶質合金薄帯(X)と
Co基非晶質合金薄帯(Y)を組み合わせた複合トロイ
ダルコアである。
The present invention is a composite toroidal core in which an Fe-based amorphous alloy ribbon (X) and a Co-based amorphous alloy ribbon (Y) are combined.

【0014】Fe基非晶質合金薄帯(X)は飽和磁束密
度1.4T以上でなければならない。このために、合金
組成はFea Sib c d (ここでa,b,c,dは
原子パーセントを表し、a=100−b−c−d、1≦
b≦20、5≦c≦20、0≦d≦5)であることが望
ましい。このFe基非晶質合金薄帯(X)に適当な熱処
理を加えることにより、比透磁率の直流重畳特性が向上
し、インパルスノイズの減衰特性が向上する。
The Fe-based amorphous alloy ribbon (X) must have a saturation magnetic flux density of 1.4 T or more. For this reason, the alloy composition is Fe a Si b B c C d (where a, b, c and d represent atomic percentages, and a = 100−b−c−d, 1 ≦
It is desirable that b ≦ 20, 5 ≦ c ≦ 20, 0 ≦ d ≦ 5). Appropriate heat treatment is applied to the Fe-based amorphous alloy ribbon (X) to improve the direct current superposition characteristic of relative permeability and the impulse noise attenuation characteristic.

【0015】またCo基非晶質合金薄帯(Y)は1kHz
,5mOe における比透磁率が20000以上でなけれ
ばならない。これを実現する合金組成として例えば、C
a Feb Nic Sid e f (ここでMはNb,M
o,Ta,Wのうち少なくとも一種であり、また、a,
b,c,d,e,fは原子パーセントを表し、a=10
0−b−c−d−e−f、0≦b≦10、0≦c≦1
0、1≦d≦20、5≦e≦20、0≦f≦5)が挙げ
られる。このCo基非晶質合金薄帯(Y)に適当な熱処
理を加えることにより、比透磁率が向上し、コイルのイ
ンダクタンスが大きくなり、低電圧ノイズ、特に低周波
数域での減衰特性が向上する。
The Co-based amorphous alloy ribbon (Y) is 1 kHz.
, The relative permeability at 5 mOe must be 20,000 or more. As an alloy composition for realizing this, for example, C
o a Fe b Ni c Si d Be M f (where M is Nb, M
at least one of o, Ta, W, and a,
b, c, d, e and f represent atomic percentages, and a = 10
0-b-c-d-e-f, 0 ≦ b ≦ 10, 0 ≦ c ≦ 1
0, 1 ≦ d ≦ 20, 5 ≦ e ≦ 20, 0 ≦ f ≦ 5). By applying an appropriate heat treatment to the Co-based amorphous alloy ribbon (Y), the relative magnetic permeability is improved, the inductance of the coil is increased, and the low voltage noise, especially the attenuation characteristic in the low frequency range is improved. ..

【0016】これらの薄帯(X),(Y)を同心に巻き
回して複合トロイダルコアとする。図1に種々の重量割
合をもつ複合コアを用いたコモンモードチョークコイル
における、Co基非晶質合金薄帯(Y)の重量割合によ
る1kHz のインダクタンスの変化及び、インパルスノイ
ズの減衰特性を表すVcの変化を示す。Vcは図2に示
す減衰曲線が急激に上昇する時の入力電圧である。図1
を見て分かるように、Co基非晶質合金薄帯(Y)の重
量増加により、従来から予想される単純な相加平均則よ
りも効率よくインダクタンスが向上している。またVc
はCo基非晶質合金薄帯(Y)の重量割合が20%程度
まではほぼ一定で、重量割合がそれより増加すると急激
に低下する。即ち、本発明の複合コアとすることによ
り、低周波数域の低電圧ノイズとインパルスノイズを、
同時に効率良く減衰できるノイズフィルタ用のトロイダ
ルコアが実現できる。またここで複合の際、Co基非晶
質合金薄帯(Y)の重量割合はコア全体に対して1〜2
0%でなければならない。それは、Co基非晶質合金薄
帯(Y)の重量割合が1%以下ではインダクタンスの向
上に効果がなく、20%以上になるとインパルスノイズ
の減衰特性が劣化するからである。
These ribbons (X) and (Y) are wound concentrically to form a composite toroidal core. Fig. 1 shows the change in inductance of 1kHz depending on the weight ratio of Co-based amorphous alloy ribbon (Y) and the Vc which represents the attenuation characteristic of impulse noise in the common mode choke coil using the composite core with various weight ratios. Shows the change of. Vc is the input voltage when the attenuation curve shown in FIG. 2 rapidly rises. Figure 1
As can be seen from the above, due to the increase in the weight of the Co-based amorphous alloy ribbon (Y), the inductance is improved more efficiently than the simple arithmetic mean rule expected conventionally. Also Vc
Is almost constant until the weight ratio of the Co-based amorphous alloy ribbon (Y) is about 20%, and sharply decreases as the weight ratio increases. That is, by using the composite core of the present invention, low voltage noise and impulse noise in the low frequency range,
At the same time, it is possible to realize a toroidal core for a noise filter that can be efficiently attenuated. In addition, when the composite is used, the weight ratio of the Co-based amorphous alloy ribbon (Y) is 1 to 2 with respect to the entire core.
Must be 0%. This is because when the weight ratio of the Co-based amorphous alloy ribbon (Y) is 1% or less, there is no effect in improving the inductance, and when it is 20% or more, the damping characteristic of impulse noise deteriorates.

【0017】また複合された状態のコアは、1kHz ,5
mOe における比透磁率が5000以上、かつ、比透磁率
(1kHz 、1mOe)の直流重畳特性を表すH80が10A/
m以上とならなければならない。
The core in the composite state is 1 kHz, 5
The relative magnetic permeability in mOe is 5000 or more, and H 80 representing the DC superposition characteristic of the relative magnetic permeability (1 kHz, 1 mOe) is 10 A /
Must be greater than m.

【0018】低電圧ノイズの減衰の為には、コイルのイ
ンダクタンスが大きいことが望まれるが、インダクタン
スはコア材の比透磁率に比例する。低電圧ノイズ、特に
低周波数域での減衰特性の向上のため、1kHz ,5mOe
における比透磁率を5000以上に限定した。
In order to attenuate low voltage noise, it is desired that the coil has a large inductance, but the inductance is proportional to the relative permeability of the core material. 1kHz, 5mOe for improving low voltage noise, especially attenuation characteristics in low frequency range
The relative magnetic permeability in was limited to 5000 or more.

【0019】また、前述したように、インパルスノイズ
の減衰にはコアの透磁率の直流重畳特性が優れているこ
とが必要である。
Further, as described above, it is necessary for the attenuation of the impulse noise that the magnetic permeability of the core is excellent in the DC superimposition characteristic.

【0020】高電圧インパルスノイズの減衰特性の向上
のため、比透磁率(1kHz ,1mOe)の直流重畳特性を表
わすH80を10A/m以上に限定した。
In order to improve the attenuation characteristic of high voltage impulse noise, H 80 , which represents the DC superposition characteristic of relative permeability (1 kHz, 1 mOe), is limited to 10 A / m or more.

【0021】このような複合コアは、アモルファスワイ
ヤなどを用いるクロスインダクタ等のマイクロ磁気素子
にも応用できる。
Such a composite core can also be applied to a micro magnetic element such as a cross inductor using an amorphous wire.

【0022】[0022]

【実施例】以下実施例について説明する。EXAMPLES Examples will be described below.

【0023】Fe基非晶質合金薄帯(X)としてFe78
Si9 43の組成の非晶質合金薄帯を、Co基非晶質合
金薄帯(Y)としてCo69Fe4 Si169 Mo2 の組
成の非晶質合金薄帯を用いた。最終コアサイズをφ25
mm×φ15mm×φ10mmt としFe基非晶質合金薄帯
(X)とCo基非晶質合金薄帯(Y)をCo基非晶質合
金薄帯(Y)が内側になるように同心で巻き回し、種々
の重量割合をもつ複合コアを作成した。このコアにφ
1.3mm、18ターンの巻線を施しコモンモードチョー
クコイルとした。尚、Fe基非晶質合金薄帯(X)には
420℃、1時間の熱処理を、Co基非晶質合金薄帯
(Y)には440℃、1時間の熱処理を施した。
Fe 78 as an Fe-based amorphous alloy ribbon (X)
An amorphous alloy ribbon having a composition of Si 9 B 43 and an amorphous alloy ribbon having a composition of Co 69 Fe 4 Si 16 B 9 Mo 2 were used as a Co-based amorphous alloy ribbon (Y). Final core size is φ25
mm × φ15 mm × φ10 mm t and concentric Fe base amorphous alloy ribbon (X) and Co base amorphous alloy ribbon (Y) with Co base amorphous alloy ribbon (Y) inside Wound to make composite cores with various weight percentages. Φ to this core
A 1.3 mm, 18-turn winding was applied to form a common mode choke coil. The Fe-based amorphous alloy ribbon (X) was heat-treated at 420 ° C. for 1 hour, and the Co-based amorphous alloy ribbon (Y) was heat-treated at 440 ° C. for 1 hour.

【0024】各コモンモードチョークコイルのインダク
タンスとVcの値を表1に示す。
Table 1 shows the inductance and Vc of each common mode choke coil.

【0025】[0025]

【表1】 [Table 1]

【0026】[0026]

【発明の効果】本発明は、インパルスノイズ減衰に優れ
るFe基非晶質合金からなるトロイダルコアに、低電圧
ノイズの減衰に優れるCo基非晶質合金からなるトロイ
ダルコアを組み合わせることにより、低周波数域の低電
圧ノイズと、高電圧インパルスノイズを同時に、効率良
く減衰できる。
EFFECTS OF THE INVENTION The present invention combines a toroidal core made of a Fe-based amorphous alloy excellent in impulse noise attenuation with a toroidal core made of a Co-based amorphous alloy excellent in attenuation of low-voltage noise to reduce a low frequency. Low voltage noise and high voltage impulse noise in the range can be efficiently attenuated at the same time.

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

【図1】Co基非晶質合金薄帯の重量割合に対する複合
コアのインダクタンスの変化及び、インパルスノイズの
減衰特性を表わすVeの変化を示すグラフである。
FIG. 1 is a graph showing a change in inductance of a composite core and a change in Ve representing an attenuation characteristic of impulse noise with respect to a weight ratio of a Co-based amorphous alloy ribbon.

【図2】インパルスノイズの減衰曲線の一例を示すグラ
フである。
FIG. 2 is a graph showing an example of an attenuation curve of impulse noise.

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】 飽和磁束密度1.4T以上のFe基非晶
質合金薄帯(X)と、1kHz ,5mOe における比透磁率
が20000以上のCo基非晶質合金薄帯(Y)を同心
に巻き回してなる複合トロイダルコアであって、コア全
体に対してCo基非晶質合金薄帯(Y)の重量割合が1
〜20%であることを特徴とする、低電圧ノイズ減衰と
インパルスノイズ減衰に優れるノイズフィルタ用複合ト
ロイダルコア。
1. An Fe-based amorphous alloy ribbon (X) having a saturation magnetic flux density of 1.4 T or more and a Co-based amorphous alloy ribbon (Y) having a relative magnetic permeability of 20000 or more at 1 kHz and 5 mOe are concentric with each other. A composite toroidal core formed by winding the core into a core, wherein the weight ratio of the Co-based amorphous alloy ribbon (Y) to the entire core is 1
A composite toroidal core for a noise filter, which is excellent in low voltage noise attenuation and impulse noise attenuation, which is characterized in that it is up to 20%.
【請求項2】 複合された状態で、1kHz ,5mOe にお
ける比透磁率が5000以上、かつ比透磁率(1kHz ,
1mOe)の直流重畳特性を表すH80が10A/m以上とな
る請求項1に記載のノイズフィルタ用複合トロイダルコ
ア。
2. In a composite state, the relative magnetic permeability at 1 kHz, 5 mOe is 5000 or more, and the relative magnetic permeability (1 kHz,
The composite toroidal core for a noise filter according to claim 1, wherein H 80 representing a direct current superposition characteristic of 1 mOe) is 10 A / m or more.
JP4093978A 1992-04-14 1992-04-14 Composite toroidal core for noise filter Withdrawn JPH05291020A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4093978A JPH05291020A (en) 1992-04-14 1992-04-14 Composite toroidal core for noise filter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4093978A JPH05291020A (en) 1992-04-14 1992-04-14 Composite toroidal core for noise filter

Publications (1)

Publication Number Publication Date
JPH05291020A true JPH05291020A (en) 1993-11-05

Family

ID=14097495

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4093978A Withdrawn JPH05291020A (en) 1992-04-14 1992-04-14 Composite toroidal core for noise filter

Country Status (1)

Country Link
JP (1) JPH05291020A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002529929A (en) * 1998-11-06 2002-09-10 ハネウェル・インターナショナル・インコーポレーテッド Bulk amorphous metal magnetic components

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002529929A (en) * 1998-11-06 2002-09-10 ハネウェル・インターナショナル・インコーポレーテッド Bulk amorphous metal magnetic components

Similar Documents

Publication Publication Date Title
JPS5933183B2 (en) Low loss amorphous alloy
RU2005133713A (en) MAGNETIC WIRE, METHOD FOR PRODUCING SUCH MAGNET WIRE, FIELD OF APPLICATION OF SUCH MAGNET WIRE, IN PARTICULAR, IN TRANSFORMERS OF CURRENT AND CURRENT-THROTTLE THROTTLES, AS WELL AS
WO2021157165A1 (en) Annular magnetic body for noise control
JPH01294847A (en) Soft-magnetic alloy
JPH05291020A (en) Composite toroidal core for noise filter
JPH07153613A (en) Core for choke coil and nonlinear choke coil
JPS627101A (en) Common mode choke coil using composite magnetic core
JP3533237B2 (en) Saturable core and magnetic amplifier using the same
JPS59182514A (en) Magnetic core for choke coil
JPH03198312A (en) Iron core for swinging choke coil and its manufacture
JPS6059708A (en) Magnetic core
JPS6032313A (en) Magnetic core
JP2633813B2 (en) Manufacturing method of reactor for switching circuit
JPH0257683B2 (en)
JPH03238806A (en) Swinging choke coil
JP2859286B2 (en) Manufacturing method of ultra-microcrystalline magnetic alloy
JP2637114B2 (en) Inductance element
JP2835127B2 (en) Magnetic core and manufacturing method thereof
JP2501859B2 (en) Switching regulator
JPS59150404A (en) Electromagnetic device
JPS61295602A (en) Amorphous core for common mode choke
JPH05117818A (en) Ultramicrocrystalline soft magnetic alloy
JPS60165705A (en) Wound magnetic core
JPS60178610A (en) Choke coil
JPH0760770B2 (en) Magnetic core for oscillation transformer

Legal Events

Date Code Title Description
A300 Withdrawal of application because of no request for examination

Free format text: JAPANESE INTERMEDIATE CODE: A300

Effective date: 19990706