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JPH0669002A - Positive temperature coefficient characteristic thermistor - Google Patents

Positive temperature coefficient characteristic thermistor

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Publication number
JPH0669002A
JPH0669002A JP24582392A JP24582392A JPH0669002A JP H0669002 A JPH0669002 A JP H0669002A JP 24582392 A JP24582392 A JP 24582392A JP 24582392 A JP24582392 A JP 24582392A JP H0669002 A JPH0669002 A JP H0669002A
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JP
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Patent type
Prior art keywords
electrodes
temperature
coefficient
positive
characteristic
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
JP24582392A
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Japanese (ja)
Inventor
Yoshinori Akiyama
Hidetaka Hayashi
Akio Nara
Yasuhiro Oya
康裕 大矢
昭夫 奈良
秀隆 林
喜則 秋山
Original Assignee
Nippondenso Co Ltd
日本電装株式会社
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
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Abstract

PURPOSE:To avoid the cracking of the positive temperature coefficient characteristic thermistor and the short-circuit of electrodes by suppressing any abnormal heat. CONSTITUTION:The electrodes 2 in contact with feeder terminals 3 are divided into two parts so that the whole current amount fed to the positive temperature coefficient characteristic thermistor element 1 may be dispersed in the divided numbers of the electrodes 2 to avoid the local current concentration in the same electrodes 2 while suppressing the abnormal heat.

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、車両用ヒータ及びレジスタとして使用する正特性サーミスタに関する。 The present invention relates to a PTC thermistor used as a heater and a register for a vehicle.

【0002】 [0002]

【従来の技術】図5は、従来技術の正特性サーミスタの構成図である。 BACKGROUND ART FIG. 5 is a block diagram of a PTC thermistor of the prior art. 正特性サーミスタは、図5(a)に示す正特性サーミスタ素子1の両面に電極2が付与され、その電極2上に図5(b)に示す給電端子3を押圧又は絶縁性接着剤により固定し接触した状態で、正特性サーミスタ素子1表面と給電端子3間が電気的に導通する構造である。 PTC thermistor, FIG. 5 electrodes 2 on both surfaces of the positive characteristics thermistor element 1 shown in (a) is given, fixed power supply terminal 3 shown in FIG. 5 (b) thereon electrode 2 by pressing or insulating adhesive in contact state between the positive characteristics thermistor element 1 surface feeding terminal 3 has a structure that electrically conductive.

【0003】図5(c)に示す上記正特性サーミスタの給電端子3と電極2の接触構造は、微視的に電極2側の凸部2a、又は、給電端子3側の凸部3aで部分的に接触している状態である。 [0003] the contact structure of Figure 5 feeding terminal 3 of the PTC thermistor shown in (c) and the electrode 2 is microscopically electrode 2 side of the convex portion 2a, or partially convex portion 3a of the power feeding terminal 3 side it is a state of contact. ここで、給電端子3と電極2との接触部が非常に減少した場合、異常発熱となる。 Here, when the contact portion between the power supply terminal 3 and the electrode 2 is greatly reduced, an abnormal heat generation. 例えば、1ケ所のみの点接触になった場合、Iを正特性サーミスタ素子1に流れる電流としRを接触部の接触抵抗とすると、単位時間当たりの発熱量Qは、次式で示される。 For example, 1 when it becomes the contact places only points, if the contact resistance of the contact portion R as a current flowing through the I positive characteristics thermistor element 1, the calorific value Q per unit time is given by the following equation.

【0004】 [0004]

【数1】Q=I 2 [Number 1] Q = I 2 R

【0005】上記、点接触部に電流が集中することにより異常発熱を起こし、正特性サーミスタ素子1の割れや正特性サーミスタ素子1の耐電圧破壊によるショート等の問題がある。 [0005] The above, cause abnormal heat generation by current is concentrated on the point contact portion, there is a positive characteristic thermistor element 1 cracks or PTC thermistor element 1 such as a short due to withstand voltage breakdown problems.

【0006】そこで、正特性サーミスタ素子1の板厚を増したり、接触面の平面度を向上させたり、押圧荷重を増したりして対応してきたが、それぞれコスト増加となると同時にこれらの方法では確実な対策とはいえなかった。 [0006] Accordingly, or increasing the thickness of the PTC thermistor element 1, or to improve the flatness of the contact surface, it has been associated with or increase the pressing load, ensuring at each cost increases to become at the same time these methods It did not say that Do measures.

【0007】 [0007]

【発明が解決しようとする課題】上記問題点を解決するため本発明は、簡易な構成で、電流集中を正特性サーミスタ素子の割れやショートが発生しないレベルまで低減することを課題とする。 The present invention for solving the above problems [0005] is a simple structure, it is an object to reduce the current concentration to a level where breakage or short circuit of the positive characteristics thermistor element is not generated.

【0008】 [0008]

【課題を解決するための手段】上記課題を解決するため、本発明は、平板状の正特性サーミスタ素子の両面に電極を付与し、その電極へ電力供給する給電端子を設ける正特性サーミスタにおいて、電極に対向する同一又は同電位の給電端子に対し電極を複数個に分割し、その電極と正特性サーミスタとの接触点の電流集中を減少させることを特徴とする正特性サーミスタを提供する。 In order to solve the above problems SUMMARY OF THE INVENTION The present invention provides a positive characteristic thermistor electrodes are applied on both surfaces of the plate-like PTC thermistor element, provided the power supplied power supply terminal to the electrodes, divide the electrode into a plurality to power supply terminals of the same or the same potential opposite the electrode, to provide a positive characteristic thermistor, wherein reducing the current concentration of the contact point between the electrode and the PTC thermistor.

【0009】 [0009]

【作用】本発明は、図1に示すように給電端子3から正特性サーミスタ素子1に対し電極2が両面とも2分割され付与される場合には、接触が一点のみの接触状態になり発熱量Qは、次式で示される。 DETAILED DESCRIPTION OF THE INVENTION The present invention, in the case where the electrode 2 to the positive characteristics thermistor element 1 is divided into two parts on both sides giving the feeding terminal 3, as shown in FIG. 1, the calorific value contact is in contact with only one point Q is shown by the following equation.

【0010】 [0010]

【数2】Q=(I/2) 2 R=1/4I 2 [Number 2] Q = (I / 2) 2 R = 1 / 4I 2 R

【0011】そうすると、発熱量Qは、従来の1/4となる。 [0011] Then, the calorific value Q is a traditional 1/4. また、図2に示すように電極2を4分割にした場合には1/16の発熱量となる。 Further, the heating value of 1/16 when the electrode 2 4 divided as shown in FIG. 以上のように電極2を分割することにより接触点における電流集中を減少させ、簡易に異常発熱量を低減でき、正特性サーミスタ素子1の割れや電極2のショートを防止することが可能となる。 Reducing the current concentration at the contact points by dividing the electrode 2 as described above, simple to be reduced abnormal heat generation amount, it is possible to prevent short-circuiting of the cracks and the electrode 2 PTC thermistor element 1.

【0012】 [0012]

【実施例】本発明の実施例を添付図面図1から図4を参照して説明する。 EXAMPLES Examples of the present invention will be described from the accompanying drawings Figure 1 with reference to FIG. 図1は、実施例の正特性サーミスタの構成図である。 Figure 1 is a block diagram of a PTC thermistor of Example. 図1(a)に示す平板状の正特性サーミスタ素子1の両面に電極2が付与されている。 Electrode 2 is applied to both surfaces of the plate-shaped PTC thermistor element 1 shown in FIG. 1 (a). 正特性サーミスタ素子1は、原料に酸化物系粉体等を用い、それらを混合焼結したセラミック系焼結体である。 PTC thermistor elements 1, the raw material in an oxide-based powder and the like, are those the mixed sintered ceramic sintered body. 電極2 Electrode 2
は、AlやAg及びCu等の材質からなり、正特性サーミスタ素子1面上へペースト印刷や溶射等の方法で形成される。 Consists of a material such as Al or Ag and Cu, is formed by the method of paste printing or spraying or the like to the positive characteristic thermistor element 1 on the surfaces of. 図1(b)に示すように前記正特性サーミスタ素子1へ給電するため、給電端子3は、CuやAl等の導電材料で作られる。 To the power supply to the PTC thermistor element 1 as shown in FIG. 1 (b), the power feeding terminal 3 is made of a conductive material such as Cu or Al. ここで、正特性サーミスタ素子1 Here, the positive characteristics thermistor element 1
と給電端子3との固定は図3に示すスプリング4による押圧、或いは図4に示すように絶縁性接着剤7によりなされる。 Fixing the feeding terminal 3 and the pressing by the spring 4 shown in FIG. 3, or made by insulating adhesive agent 7 as shown in FIG.

【0013】次に図1に示す本発明実施例の作動について説明する。 [0013] Next will be described operation of the present invention embodiment shown in Figure 1. 正特性サーミスタ素子1を挟んで対向する給電端子3間に電源を印加すると、電流は、給電端子3 When sandwiching the PTC thermistor element 1 is applied a power between power supply terminals 3 opposite, current feeding terminal 3
から図1(c)に示す凸部2aあるいは凸部3aを通り電極2に流れ、正特性サーミスタ素子1を通り、反対側の給電端子3へ流れる。 From the flow a convex portion 2a or the convex portion 3a as the electrode 2 shown in FIG. 1 (c), through the PTC thermistor elements 1, it flows in the opposite side to the power supply terminal 3.

【0014】凸部2a及び凸部3aの接触部では、流れる電流値や接触部の数などにより局部的な発熱が生じようとするが、本実施例では、前記凸部2a及び凸部3a [0014] In the contact portion of the convex portion 2a and the projections 3a, by such as the number of current value and the contact portion flow but when you local heat generation is about to occur, in the present embodiment, the convex portion 2a and the projections 3a
に流れる電流量を減少させるため、給電端子3が接触する電極2を分割して、正特性サーミスタ素子1に供給する全電流量を電極2の分割数に配分しているため、同一で同電位の電極2による局部的な電流集中が防がれ、電極2や給電端子3が異常発熱を抑えて、素子割れ、ショート等を防ぐ。 To reduce the amount of current flowing to, by dividing the electrodes 2 feeding terminal 3 is in contact, because it allocated the number of divisions of the total amount of current electrodes 2 to be supplied to the positive characteristic thermistor element 1, the same potential in the same the local current concentration due to electrode 2 is prevented, suppressing electrode 2 and the feeding terminal 3 is abnormal heat generation, preventing element cracking, a short circuit or the like.

【0015】次に、その他の応用実施例について説明する。 Next, a description will be given another Application Example. 図3は、本発明の第2実施例を示す構成図である。 Figure 3 is a block diagram showing a second embodiment of the present invention.
図3(a)において、円形平板状の正特性サーミスタ素子1の両面に電極2が4分割されて付与されている。 3 (a), the electrode 2 on both surfaces of the circular plate-like PTC thermistor element 1 is applied are divided into four. 電極2は、Ag、Al等のペースト印刷により形成される。 Electrode 2, Ag, are formed by paste printing, such as Al. 図3(b)に示すカバー5は、金属材料より成り放熱部材及び電極部材とを兼ね備え、正特性サーミスタ素子1を給電端子3を介するスプリング4によって押圧により固定する。 Cover 5 shown in FIG. 3 (b), both a heat radiating member and the electrode member made of a metal material, is fixed by pressing by the spring 4 of the positive characteristics thermistor element 1 via the feed terminal 3. 図3(c)に示す正特性サーミスタ素子1とカバー5との接触部は、電極2の微視的な凸部2a Contact portion between PTC thermistor element 1 and the cover 5 shown in FIG. 3 (c), microscopic protrusions 2a of the electrode 2
となる。 To become.

【0016】次に、更にその他の応用実施例を説明する。 Next, explaining still another application example. 図4は、本発明の第3実施例を示す構成図である。 Figure 4 is a block diagram showing a third embodiment of the present invention.
図4(a)において、正特性サーミスタ素子1の両面に電極2が4分割されて付与されている。 4 (a), the electrode 2 on both surfaces of the positive characteristics thermistor element 1 is applied are divided into four. 図4(b)及び図4(c)に示すように、電極2は溶射あるいはペーストに金属粒を添加したような形で凹凸が形成され、給電端子3とフィン6はロウ付け又はハンダ付などにより固着され放熱ブロックを構成し、給電端子3が正特性サーミスタ素子1の電極2の凸部2aと接触するように絶縁性接着剤7により固定されている。 FIGS. 4 (b) and 4, as shown in FIG. 4 (c), the electrode 2 is irregularities formed in such a way was added to the metal particles in the spraying or paste, the feeding terminal 3 and the fins 6 are such as brazing or soldering is fixed by insulating adhesive agent 7 as fixed constitutes a heat dissipation block, feeding terminal 3 is in contact with the positive characteristic protrusion 2a of the thermistor element 1 of the electrode 2 by. ここで、正特性サーミスタ素子1の電極2と給電端子3とは、電極2の凸部2aにより接触している。 Here, the electrodes 2 of the positive characteristic thermistor element 1 and the feeding terminal 3 contacts with the convex portion 2a of the electrode 2. 凸部2aは、電極2の溶射やペーストへの金属粉の添加等の方法により形成される場合もあるが、AgやAlのペーストによる微視的な凸部や給電端子3のうねり、切り起こし等による場合もある。 Convex portion 2a, there is a case formed by the method of addition of a metal powder to the electrode 2 spraying or pastes, microscopic protrusions and the feeding terminal 3 of waviness by paste Ag or Al, cutting and bending in some cases by the like.

【0017】 [0017]

【発明の効果】以上、説明したように本発明は、電極を分割し給電端子から供給される電流を分散して電流を抑えているから、簡易に異常発熱を低減でき正特性サーミスタ素子の割れや電極のショートを防止することが可能になるという優れた効果がある。 Effect of the Invention] above, the present invention as described, since to distribute the current supplied from dividing the electrode power supply terminals thereby suppressing current, the PTC thermistor element can be reduced abnormal heat generation easily cracks there is an excellent effect that it becomes possible to prevent a short circuit and the electrode.

【図面の簡単な説明】 BRIEF DESCRIPTION OF THE DRAWINGS

【図1】本発明の実施例を示す構成図である。 1 is a configuration diagram showing an embodiment of the present invention.

【図2】本発明の正特性サーミスタを4分割にした実施例を示す斜視図である。 Is a perspective view showing an embodiment in which the 4 split the PTC thermistor of the present invention; FIG.

【図3】本発明の第2実施例を示す構成図である。 3 is a block diagram showing a second embodiment of the present invention.

【図4】本発明の第3実施例を示す構成図である。 4 is a configuration diagram showing a third embodiment of the present invention.

【図5】従来技術を示す構成図である。 5 is a block diagram showing a conventional art.

【符号の説明】 DESCRIPTION OF SYMBOLS

1…正特性サーミスタ素子、 2…電極、 2a…凸部、 3…給電端子、3a…凸部。 1 ... positive characteristic thermistor device, 2 ... electrode, 2a ... protrusion, 3 ... feeding terminal, 3a ... protrusion.

───────────────────────────────────────────────────── フロントページの続き (72)発明者 大矢 康裕 愛知県刈谷市昭和町1丁目1番地 日本電 装株式会社内 ────────────────────────────────────────────────── ─── of the front page continued (72) inventor Yasuhiro Oya Kariya, Aichi Showacho 1-chome 1 address Japan electrical instrumentation within Co., Ltd.

Claims (1)

    【特許請求の範囲】 [The claims]
  1. 【請求項1】 平板状の正特性サーミスタ素子の両面に電極を付与し、その電極へ電力供給する給電端子を設ける正特性サーミスタにおいて、 電極に対向する同一又は同電位の給電端子に対して電極を複数個に分割し、その電極と正特性サーミスタとの接触点の電流集中を減少させることを特徴とする正特性サーミスタ。 1. A grant electrodes on both surfaces of the plate-shaped PTC thermistor element, the positive temperature coefficient thermistor provided with a power supply feeding terminal to the electrode, the electrode with respect to the feeding terminal of the same or the same potential opposite the electrode PTC thermistor, wherein a is divided into a plurality, reducing the current concentration of the contact point between the electrode and the PTC thermistor.
JP24582392A 1992-08-21 1992-08-21 Positive temperature coefficient characteristic thermistor Pending JPH0669002A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP24582392A JPH0669002A (en) 1992-08-21 1992-08-21 Positive temperature coefficient characteristic thermistor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP24582392A JPH0669002A (en) 1992-08-21 1992-08-21 Positive temperature coefficient characteristic thermistor

Publications (1)

Publication Number Publication Date
JPH0669002A true true JPH0669002A (en) 1994-03-11

Family

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JP24582392A Pending JPH0669002A (en) 1992-08-21 1992-08-21 Positive temperature coefficient characteristic thermistor

Country Status (1)

Country Link
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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7209715B2 (en) 2002-07-30 2007-04-24 Matsushita Electric Industrial Co., Ltd. Power amplifying method, power amplifier, and communication apparatus
US7873119B2 (en) 2006-06-14 2011-01-18 Research In Motion Limited Input drive control for switcher regulated power amplifier modules
US7907920B2 (en) 2006-06-14 2011-03-15 Research In Motion Limited Control of switcher regulated power amplifier modules
US8000409B2 (en) 2004-02-20 2011-08-16 Research In Motion Limited Method and apparatus for improving power amplifier efficiency in wireless communication systems having high peak to average power ratios
US8428181B2 (en) 2002-12-02 2013-04-23 Research In Motion Limited Method and apparatus for optimizing transmitter power efficiency
JP2014532159A (en) * 2011-10-14 2014-12-04 ヴァレオ システム テルミク Insulating heating module for auxiliary heater

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7209715B2 (en) 2002-07-30 2007-04-24 Matsushita Electric Industrial Co., Ltd. Power amplifying method, power amplifier, and communication apparatus
US8428181B2 (en) 2002-12-02 2013-04-23 Research In Motion Limited Method and apparatus for optimizing transmitter power efficiency
US8000409B2 (en) 2004-02-20 2011-08-16 Research In Motion Limited Method and apparatus for improving power amplifier efficiency in wireless communication systems having high peak to average power ratios
US7873119B2 (en) 2006-06-14 2011-01-18 Research In Motion Limited Input drive control for switcher regulated power amplifier modules
US7907920B2 (en) 2006-06-14 2011-03-15 Research In Motion Limited Control of switcher regulated power amplifier modules
JP2014532159A (en) * 2011-10-14 2014-12-04 ヴァレオ システム テルミク Insulating heating module for auxiliary heater

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