JPH0782799B2 - Current fuse - Google Patents
Current fuseInfo
- Publication number
- JPH0782799B2 JPH0782799B2 JP11309286A JP11309286A JPH0782799B2 JP H0782799 B2 JPH0782799 B2 JP H0782799B2 JP 11309286 A JP11309286 A JP 11309286A JP 11309286 A JP11309286 A JP 11309286A JP H0782799 B2 JPH0782799 B2 JP H0782799B2
- Authority
- JP
- Japan
- Prior art keywords
- fuse
- current
- current fuse
- resistance value
- silicon carbide
- 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 - Lifetime
Links
- 239000000835 fiber Substances 0.000 claims description 5
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical group [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 5
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 5
- 230000007423 decrease Effects 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 description 7
- 239000002184 metal Substances 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 1
- 238000005229 chemical vapour deposition Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 150000003377 silicon compounds Chemical class 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
Landscapes
- Fuses (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は電流ヒューズの改良に関するものである。Description: FIELD OF THE INVENTION The present invention relates to improvements in current fuses.
（先行技術と問題点） 電気回路、電気機器を過電流から保護するために電流ヒ
ューズを用いることがある。而るに、電気回路等におけ
る課電開始時、回路の温度が低く、かかる温度下、その
回路抵抗が比較的低いために、回路に比較的大なる電
流、いわゆるラッシュ電流が流れることがあり、金属線
を用いた電流ヒューズにおいては、このラッシュ電流に
よって溶断してしまうことがある。(Prior Art and Problems) A current fuse may be used to protect an electric circuit or an electric device from an overcurrent. Therefore, at the start of charging the electric circuit or the like, the temperature of the circuit is low, and under such temperature, the circuit resistance thereof is relatively low, so that a relatively large current, so-called rush current, may flow in the circuit, In a current fuse using a metal wire, the rush current may blow the fuse.
而るに、この電流ヒューズの溶断を招来するそのヒュー
ズの加熱状態は、ラッシュ電流をI,ヒューズの抵抗をR,
ヒューズの熱容量をQ,ヒューズの放熱抵抗をH,時間をｔ
とすれば、 が成立し、 式によってほぼ把握でき、その加熱速度は 式によって把握できる。Therefore, the heating state of the fuse that causes the melting of this current fuse is such that the rush current is I, the resistance of the fuse is R,
The heat capacity of the fuse is Q, the heat radiation resistance of the fuse is H, and the time is t
given that, Holds, You can almost understand by the formula, and the heating rate is It can be grasped by the formula.
上記ラッシュ電流による電流ヒューズの溶断を防止する
には、上記式により示された加熱速度を緩慢にするこ
とが有効であり、従来、その防止手段として電流ヒュー
ズの熱容量Ｑを大きくすることが知られている。例え
ば、金属線のヒューズエレメントをセラミックコアに巻
付けることが公知である。In order to prevent the blowout of the current fuse due to the rush current, it is effective to make the heating rate shown by the above equation slow. Conventionally, it has been known to increase the heat capacity Q of the current fuse as a means for preventing it. ing. For example, it is known to wind metal wire fuse elements around a ceramic core.
しかしながら、従来例においては、本来のヒューズエレ
メント以外に他の部材を付加する必要があり、電気ヒュ
ーズの構造の複雑化を避け得ない。However, in the conventional example, it is necessary to add other members in addition to the original fuse element, and the structure of the electric fuse cannot be complicated.
（発明の目的） 本発明の目的は、ヒューズエレメントの材質を改変する
だけで電流ヒューズの耐ラッシュ性を改良することにあ
る。(Object of the Invention) An object of the present invention is to improve the rush resistance of a current fuse simply by modifying the material of the fuse element.
（発明の構成） 本発明に係る電流ヒューズは、ヒューズエレメントに、
温度上昇に従って抵抗値が減少する抵抗値特性の可溶性
抵抗体、例えば、炭化けい素繊維を用いたことを特徴と
する構成である。(Structure of the Invention) The current fuse according to the present invention includes a fuse element,
The constitution is characterized in that a soluble resistor having a resistance value characteristic in which the resistance value decreases as the temperature rises, for example, a silicon carbide fiber is used.
（実施例の説明） 炭化けい素繊維としては、有機けい素化合物を原料とし
た連続フィラメントヤーン、CVD法によってつくられた
モノフィラメントまたはβ−シリコンカーバイドウィス
カー等を用いることができる。(Explanation of Examples) As the silicon carbide fiber, a continuous filament yarn made of an organic silicon compound as a raw material, a monofilament produced by a CVD method, or β-silicon carbide whiskers can be used.
炭化けい素繊維は半導体性であり、その抵抗値は、温度
上昇に従って減少する。その抵抗値特性をＲ（１−kT）
とすれば（ただし、Ｒは常温での抵抗値、Ｔは常温に対
する上昇温度、ｋは定数）、上記第１式に対応する式、
すなわち、ラッシュ電流に対するヒューズの加熱状態を
示す式は、 すなわち、 となり、上記第３式に対応する加熱速度は、 ほぼ′式で把握できる。Silicon carbide fibers are semiconducting and their resistance decreases with increasing temperature. The resistance value characteristic is R (1-kT)
(Where R is the resistance value at room temperature, T is the temperature rise relative to room temperature, and k is a constant), the equation corresponding to the first equation above,
That is, the equation showing the heating state of the fuse with respect to the rush current is That is, Therefore, the heating rate corresponding to the above third equation is It can be understood by almost the formula.
而して、第３式に較べて、実質上、Ｈを小さくできるか
ら、ヒューズの加熱速度をそれだけ低速にできる。尚、
本発明は、適宜の対応で実施でき、例えば、アキシャル
型、ラジアル型、基板型等の対応で実施できる。As compared with the third formula, H can be substantially reduced, so that the heating rate of the fuse can be reduced by that much. still,
The present invention can be implemented by appropriate measures, for example, axial type, radial type, substrate type and the like.
（発明の効果） このように、本発明に係る電流ヒューズにおいては、ヒ
ューズエレメントに、温度上昇に従って抵抗値が減少す
る抵抗値特性の可溶性抵抗体を用いているから、ラッシ
ュ電流に対する加熱速度をよく緩和でき、ラッシュ電流
下での電流ヒューズの溶断を排除できる。特に、可溶性
抵抗体として炭化けい素繊維を用いる場合は、ヒューズ
エレメントの引張り強度を大にできるために、ヒューズ
エレメントをリード導体間に連結する作業も容易であ
る。(Effects of the Invention) As described above, in the current fuse according to the present invention, since the fusible resistor having the resistance value characteristic in which the resistance value decreases as the temperature rises is used in the fuse element, the heating rate with respect to the rush current is improved. It can be alleviated, and the blowout of the current fuse under rush current can be eliminated. In particular, when silicon carbide fiber is used as the fusible resistor, the tensile strength of the fuse element can be increased, so that the work of connecting the fuse element between the lead conductors is easy.
Claims (2)
抵抗値が減少する抵抗値特性の可溶性抵抗体を用いたこ
とを特徴とする電流ヒューズ。1. A current fuse, wherein a fusible resistor having a resistance value characteristic whose resistance value decreases as the temperature rises is used for the fuse element.
を特徴とする特許請求の範囲第１項記載の電流ヒュー
ズ。2. The current fuse according to claim 1, wherein the fusible resistor is a silicon carbide fiber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11309286A JPH0782799B2 (en) | 1986-05-16 | 1986-05-16 | Current fuse |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11309286A JPH0782799B2 (en) | 1986-05-16 | 1986-05-16 | Current fuse |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62271322A JPS62271322A (en) | 1987-11-25 |
| JPH0782799B2 true JPH0782799B2 (en) | 1995-09-06 |
Family
ID=14603277
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11309286A Expired - Lifetime JPH0782799B2 (en) | 1986-05-16 | 1986-05-16 | Current fuse |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0782799B2 (en) |
-
1986
- 1986-05-16 JP JP11309286A patent/JPH0782799B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62271322A (en) | 1987-11-25 |
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