JP4501458B2 - PTC element selection method - Google Patents
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Description
本発明は、異なる抵抗−温度特性を有するＰＴＣ素子を選別するための選別方法に関する。 The present invention relates to a sorting method for sorting PTC elements having different resistance-temperature characteristics.
一般に、正の抵抗温度特性を有するＰＴＣ素子は、キュリー温度（以下、適宜ＣＰと略する）を超えると、抵抗値が急激に増加する特性を有しており、例えば電子回路の過電流保護素子として、あるいは温度検出素子として使用されている。 In general, a PTC element having a positive resistance temperature characteristic has a characteristic that a resistance value rapidly increases when a Curie temperature (hereinafter abbreviated as CP as appropriate) is exceeded. For example, an overcurrent protection element for an electronic circuit Or as a temperature detection element.
このようなＰＴＣ素子では、例えば製造過程で不純物の混入などによって特性不良が発生する場合があり、このため製造されたＰＴＣ素子の良否を判定するようにしている。このような良否の判定方法として、例えばＰＴＣ素子のインピーダンスを測定し、その抵抗成分の値により良否を評価する方法がある（例えば、特許文献１参照）。また他の判定方法として、通電時の突入電流値，定常電流値を設定し、この設定値を超えない突入電流及び定常電流を有するＰＴＣ素子を選定する方法がある（例えば、特許文献２参照）。 In such a PTC element, there may be a case where a characteristic defect occurs due to, for example, an impurity mixed in the manufacturing process. For this reason, the quality of the manufactured PTC element is determined. As such a quality determination method, for example, there is a method of measuring the impedance of a PTC element and evaluating the quality based on the value of its resistance component (see, for example, Patent Document 1). As another determination method, there is a method of setting an inrush current value and a steady current value at the time of energization and selecting a PTC element having an inrush current and a steady current that do not exceed the set values (see, for example, Patent Document 2). .
一方、現在では市場要求に応えるために、様々な抵抗温度特性を持ったＰＴＣ素子が市販されており、ＰＴＣ素子自体の超小型化も進んでいる。最近では、例えば１．６×０．８ｍｍ、０．６×０．３ｍｍ程度の微小チップ部品も開発されている。
ところで、ＰＴＣ素子の部品管理を行なう中で、管理中のＰＴＣ素子に何らかの原因で異種特性のＰＴＣ素子が誤って混入する場合が考えられる。このような場合には、混入した異種部品を選別する必要が生じるが、上記従来の何れの方法を採用しても、異なる抵抗温度特性を有するＰＴＣ素子を選別するのは困難であり、部品管理の効率を高めるうえでの改善が望まれている。 By the way, when performing component management of PTC elements, there may be cases where PTC elements having different characteristics are erroneously mixed into the PTC elements being managed for some reason. In such a case, it is necessary to sort out the mixed different parts, but it is difficult to sort out the PTC elements having different resistance temperature characteristics by adopting any of the above conventional methods. Improvements are needed to increase the efficiency.
また現在、異種部品が混入するのを防ぐために、ＰＴＣ素子に識別用のマーキングを施すことも行なわれているが、チップの小型化が進む中で、微小チップ部品にマーキングすることは困難であり、このため外観から抵抗温度特性の違いを判別することができない。また短時間で測定できる抵抗値や耐圧でもっても特性を判別することはできないというのが実情である。従って、混入したＰＴＣ素子を選別するには、全数チェックで各素子の抵抗温度特性を測定しなければならず、多大な時間と手間を要するという問題がある。 At present, in order to prevent mixing of different types of parts, marking for identification is also applied to the PTC element. However, it is difficult to mark minute chip parts as the size of chips is reduced. Therefore, the difference in resistance temperature characteristics cannot be determined from the appearance. In fact, it is impossible to determine characteristics even with resistance values and withstand voltages that can be measured in a short time. Therefore, in order to select the mixed PTC elements, it is necessary to measure the resistance temperature characteristics of each element by a total number check, and there is a problem that much time and labor are required.
本発明は、上記従来の実情に鑑みてなされたもので、異種部品が混入した場合の選別を容易にかつ確実に行なうことができるＰＴＣ素子の選別方法を提供することを目的としている。 The present invention has been made in view of the above-described conventional situation, and an object of the present invention is to provide a PTC element selection method that can easily and reliably perform selection when different types of components are mixed.
請求項１の発明は、異なる抵抗−温度特性を有するＰＴＣ素子の選別方法において、各ＰＴＣ素子に値の異なる複数の電圧を印加し、略熱平衡状態に達した時に該各ＰＴＣ素子に流れるそれぞれの電流値同士の相違によって選別を行なうことを特徴としている。
The invention according to
請求項２の発明は、異なる抵抗−温度特性を有するＰＴＣ素子の選別方法において、各ＰＴＣ素子に値の異なる複数の電流を流し、略熱平衡状態に達した時に該各ＰＴＣ素子に印加されるそれぞれの電圧値同士の相違によって選別を行なうことを特徴としている。 According to a second aspect of the present invention, in the method for selecting PTC elements having different resistance-temperature characteristics, a plurality of currents having different values are passed through each PTC element , and each of the PTC elements is applied to each PTC element when a substantially thermal equilibrium state is reached. It is characterized in that the selection is performed based on the difference between the voltage values.
ここで本発明において、略熱平衡状態に達した時とは、所定の電圧を印加した後に電流値の変化がほぼ無くなった状態を意味する。 Here, in the present invention, the time when a substantially thermal equilibrium state is reached means a state in which a change in current value has substantially disappeared after a predetermined voltage is applied.
請求項１の発明では、各ＰＴＣ素子に値の異なる複数の電圧を印加し、略熱平衡状態に達した時の各ＰＴＣ素子のそれぞれの電流値同士の相違によって特性を選別するようにしたので、選別精度を高めることができ、部品管理の効率をより一層高めることができる。
In the invention of
請求項２の発明では、各ＰＴＣ素子に値の異なる複数の電流を流し、略熱平衡状態に達した時の各ＰＴＣ素子のそれぞれの電圧値同士の相違によって特性を選別するようにしたので、請求項３と同様に選別精度を高めることができる。
In the invention of
以下、本発明の実施の形態を添付図面に基づいて説明する。 Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
図１ないし図３は、本発明の成立過程におけるＰＴＣ素子の選別方法を説明するための図であり、図１はＰＴＣ素子の電流−電圧特性図、図２はＰＴＣ素子の斜視図、図３は各ＰＴＣ素子の抵抗温度特性図である。 1 to 3 are diagrams for explaining a method of selecting a PTC element in the formation process of the present invention. FIG. 1 is a current-voltage characteristic diagram of the PTC element, FIG. 2 is a perspective view of the PTC element, and FIG. FIG. 4 is a resistance temperature characteristic diagram of each PTC element.
本成立過程及び後述する実施形態のＰＴＣ素子１は、図２に示すように、直方体状の半導体磁器１ａ内に内部電極（不図示）を埋設し、各内部電極を半導体磁器１ａの両端部に形成された外部電極２，２に接続した構造のものであり、素子サイズは、例えばＬ×Ｗ×Ｔがそれぞれ１．６×０．８×０．８ｍｍで、両外部電極幅が０．４ｍｍである。
As shown in FIG. 2, the
そして異なる抵抗温度特性を有する２つのＰＴＣ素子の選別は、各ＰＴＣ素子に所定の電圧を印加し、略熱平衡状態に達した時に該各ＰＴＣ素子に流れる電流値の違いによって行なわれる。 The selection of two PTC elements having different resistance-temperature characteristics is performed by applying a predetermined voltage to each PTC element, and by the difference in the value of current flowing through each PTC element when a substantially thermal equilibrium state is reached.
具体例として、図３に示すＣＰ＝１００±５℃のＰＴＣ素子（破線参照）Ａと、ＣＰ＝１２０±５℃のＰＴＣ素子（実線参照）Ｂとの選別を行なう場合について説明する。 As a specific example, a case will be described in which a PTC element with CP = 100 ± 5 ° C. (see broken line) A and a PTC element with CP = 120 ± 5 ° C. (see solid line) B shown in FIG.
図１に示すように、各ＰＴＣ素子Ａ，ＢにＤＣ電圧を５Ｖ／ｍｉｎのスピードで増加させつつ印加し、この時に流れる電流を電流計で測定する。そして電圧値が１５Ｖに達した時の各ＰＴＣ素子Ａ，Ｂの電流値を読み取り、この時の電流値が７ｍＡ又は９．５ｍＡの何れになるかで何れのＰＴＣ素子であるかを見分ける。即ち、ＰＴＣ素子Ａの場合は１５Ｖを印加すると７ｍＡで略熱平衡状態に達し、ＰＴＣ素子Ｂの場合は９．５ｍＡで略熱平衡状態に達する。なお、略熱平衡状態に達するとは、所定の電圧を印加した後、電流値の変化が略なくなった状態をいう。 As shown in FIG. 1, a DC voltage is applied to each PTC element A and B while increasing at a speed of 5 V / min, and the current flowing at this time is measured with an ammeter. Then, the current values of the PTC elements A and B when the voltage value reaches 15 V are read, and it is discriminated which PTC element is based on whether the current value at this time is 7 mA or 9.5 mA. That is, in the case of PTC element A, when 15 V is applied, the thermal equilibrium state is reached at 7 mA, and in the case of PTC element B, the thermal equilibrium state is reached at 9.5 mA. Note that reaching the substantially thermal equilibrium state means a state in which a change in current value is substantially eliminated after a predetermined voltage is applied.
ここで、上記印加電圧の増加速度については、静的な特性を得るには、熱平衡状態に達するか、あるいは、ある程度熱平衡状態に近い状態まで通電を続ける必要があることから、５Ｖ／ｍｉｎ以下とするのが好ましい。 Here, with respect to the increase rate of the applied voltage, in order to obtain static characteristics, it is necessary to reach a thermal equilibrium state or to continue to a state close to a thermal equilibrium state to some extent, so that it is 5 V / min or less. It is preferable to do this.
上記各ＰＴＣ素子Ａ，Ｂに電圧を印加し、略熱平衡状態に達した時の各ＰＴＣ素子Ａ，Ｂの電流値を読み取り、この電流値の相違によって選別するようにしたので、ＰＴＣ素子の基本特性である電流−電圧特性の違いを利用して混入した異種部品を容易にかつ確実に見分けることができ、部品管理の効率を高めることができる。 Since a voltage is applied to each of the PTC elements A and B to read the current value of each PTC element A and B when a substantially thermal equilibrium state is reached, the selection is made based on the difference between the current values. It is possible to easily and surely identify different kinds of components mixed by utilizing the difference in current-voltage characteristics, which is a characteristic, and the efficiency of component management can be improved.
なお、上記説明では、異種混入したＰＴＣ素子を選別するようにしたが、上記選別方法は、ＰＴＣ素子の良否の判定にも採用することが可能である。 In the above description, different types of mixed PTC elements are selected. However, the above selection method can also be used to determine whether a PTC element is good or bad.
具体例１では、Ｒ２５＝４７０Ω±５０％でＣＰ＝１００±５℃のＰＴＣ素子Ａを１００００個準備し、このなかにＲ２５＝４７０Ω±５０％でＣＰ＝１２０±５℃のＰＴＣ素子Ｂを５個混入し、各ＰＴＣ素子Ａ，Ｂの選別を行なった。なお、Ｒ２５は２５℃における抵抗値を意味する。 In Example 1, 10,000 PTC elements A with R25 = 470Ω ± 50% and CP = 100 ± 5 ° C. were prepared, and among them, 5 PTC elements B with R25 = 470Ω ± 50% and CP = 120 ± 5 ° C. were prepared. The PTC elements A and B were selected by mixing them. R25 means a resistance value at 25 ° C.
そしてＤＣ電圧を５Ｖ／ｍｉｎのスピードで３０Ｖまで上昇させ、７ｍＡが流れたときの電圧値を測定し、電圧値ＶＡ＝１４〜１６Ｖの規格から外れた素子の選別を行なった。 Then, the DC voltage was increased to 30 V at a speed of 5 V / min, the voltage value when 7 mA flowed was measured, and elements out of the standard of the voltage value VA = 14 to 16 V were selected.
その結果、規格から外れた素子が５個存在した。表１にこれら各素子について７ｍＡが流れたときの電圧値（Ｖ7mA ）と別途測点したキュリー温度を示す。表１から分かるように、試料番号１〜５の各素子は何れもＣＰが１２０±５℃内のＰＴＣ素子Ｂであった。この選別方法を用いることにより混入した異種部品を容易にかつ確実に選別できることが分かる。 As a result, there were five elements out of specification. Table 1 shows the voltage value (V7 mA) when 7 mA flows for each of these elements and the Curie temperature measured separately. As can be seen from Table 1, all the elements of Sample Nos. 1 to 5 were PTC elements B having a CP of 120 ± 5 ° C. It can be seen that by using this sorting method, mixed foreign components can be easily and reliably sorted.
図４は、本発明の第１実施形態によるＰＴＣ素子の選別方法を説明するための電流−電圧特性図である。 FIG. 4 is a current-voltage characteristic diagram for explaining the PTC element selection method according to the first embodiment of the present invention.
本実施形態は、上述と同様の各ＰＴＣ素子Ａ，ＢにＤＣ電圧を５Ｖ／ｍｉｎのスピードで印加し、電圧値が１５Ｖに達した時の各ＰＴＣ素子Ａ，Ｂの電流値を読み取るとともに、電圧値が２０Ｖに達した時の各ＰＴＣ素子Ａ，Ｂの電流値を読み取る。そしてこの時の電流値が７ｍＡと５．５ｍＡの組み合わせで略熱平衡状態に達するか、あるいは９．５ｍＡと７．５ｍＡの組み合わせで略熱平衡状態に達するかの組み合わせの相違によってＰＴＣ素子Ａ，Ｂの何れであるかが見分けられる。 In this embodiment, a DC voltage is applied to each PTC element A and B similar to the above at a speed of 5 V / min, and the current value of each PTC element A and B when the voltage value reaches 15 V is read. The current value of each PTC element A and B when the voltage value reaches 20V is read. The current value at this time is approximately equal to the thermal equilibrium state when the combination of 7 mA and 5.5 mA is reached, or the combination of 9.5 mA and 7.5 mA is approximately equal to the thermal equilibrium state depending on the combination of the PTC elements A and B. You can tell which one it is.
本実施形態では、各ＰＴＣ素子Ａ，Ｂのそれぞれに値の異なる２つの電圧を印加し、略熱平衡状態に達した時の各ＰＴＣ素子Ａ，Ｂのそれぞれの電流値同士の相違によって選別したので、選別精度を高めることができ、部品管理の効率をより一層高めることができる。 In the present embodiment, two voltages having different values are applied to each of the PTC elements A and B, and selection is performed based on the difference between the current values of the PTC elements A and B when the thermal equilibrium state is reached. Sorting accuracy can be increased, and the efficiency of parts management can be further increased.
図５は、本発明の成立過程におけるＰＴＣ素子の選別方法を説明するための電流−電圧特性図である。 FIG. 5 is a current-voltage characteristic diagram for explaining a PTC element selection method in the establishment process of the present invention.
本成立過程では、上述の各ＰＴＣ素子Ａ，Ｂに所定の電流を流し、略熱平衡状態に達した時の各ＰＴＣ素子Ａ，Ｂの電圧値の相違によってＰＴＣ素子Ａ，Ｂの何れであるかを見分ける。 In this establishment process , a predetermined current is passed through each of the PTC elements A and B described above, which of the PTC elements A and B depends on a difference in voltage value between the PTC elements A and B when a substantially thermal equilibrium state is reached. Identify.
具体的には、上記各ＰＴＣ素子Ａ，Ｂに、最大電圧を２０Ｖに制限した１５ｍＡの定電流電源を接続して、その定電流となるＤＣ電圧を増加しつつ印加し、略熱平衡状態に達した時に各ＰＴＣ素子Ａ，Ｂに印加される電圧値をオシロスコープで測定する。この時の電圧値が７〜９Ｖとなるか、あるいは上限の２０ＶとなるかでＰＴＣ素子Ａ，Ｂの何れかであるかを見分ける。即ち、ＣＰの高い方のＰＴＣ素子Ｂの電流値が最大となる点付近の定電流を流すことによって、ＣＰの低い方のＰＴＣ素子Ａは定電流１５ｍＡを確保するために定電流電源の電圧が上がることとなる。 Specifically, a 15 mA constant current power source with a maximum voltage limited to 20 V is connected to each of the PTC elements A and B, and a DC voltage that is the constant current is applied while increasing, and a substantially thermal equilibrium state is reached. Then, the voltage value applied to each PTC element A, B is measured with an oscilloscope. Whether the voltage value at this time is 7 to 9 V or the upper limit of 20 V is used to identify the PTC element A or B. That is, by passing a constant current in the vicinity of the point where the current value of the PTC element B with the higher CP is maximum, the PTC element A with the lower CP has a constant current power supply voltage of 15 mA in order to ensure a constant current of 15 mA. Will go up.
本具体例２では、ＰＴＣ素子Ａを１００００個準備し、このなかにＰＴＣ素子Ｂを５個混入し、各ＰＴＣ素子Ａ，Ｂの選別を行なった。そして上記成立過程の場合と同様の測定条件で規格２０Ｖ以外の素子を選別した。 In this specific example 2, 10,000 PTC elements A were prepared, five PTC elements B were mixed therein, and the PTC elements A and B were selected. Then, elements other than the standard 20V were selected under the same measurement conditions as in the above establishment process .
その結果、規格２０Ｖから外れた素子が５個存在した。表２にこれら各素子について１５ｍＡの定電流電源に接続したときの電流値（Ｖ15mA）と別途測定したキュリー温度を示す。表２から分かるように、試料番号１1 〜1５の各素子は何れもＣＰが１２０±５℃内のＰＴＣ素子Ｂであった。 As a result, there were five elements that deviated from the standard 20V. Table 2 shows the current value (V15 mA) and the separately measured Curie temperature when these elements are connected to a constant current power source of 15 mA. As can be seen from Table 2, all of the elements of sample numbers 11 to 15 were PTC elements B having a CP of 120 ± 5 ° C.
このように本具体例２によれば、各ＰＴＣ素子Ａ，Ｂに所定の電流を流し、略熱平衡状態に達した時の各ＰＴＣ素子Ａ，Ｂの電圧値を読み取り、この電圧値の相違によって特性を選別するようにしたので、混入した異種部品を容易にかつ確実に見分けることができ、部品管理の効率を高めることができる。 As described above, according to the second specific example, a predetermined current is supplied to each of the PTC elements A and B, and the voltage value of each of the PTC elements A and B when the substantially thermal equilibrium state is reached is read. Since the characteristics are selected, it is possible to easily and surely distinguish the mixed different parts, and the efficiency of parts management can be improved.
図６は、本発明の第２実施形態によるＰＴＣ素子の選別方法を説明するための電流−電圧特性図である。 FIG. 6 is a current-voltage characteristic diagram for explaining a PTC element selection method according to the second embodiment of the present invention.
本実施形態では、上述のＰＴＣ素子Ａ，ＢにＣＰ＝８０±５℃のＰＴＣ素子Ｃを加え、各ＰＴＣ素子Ａ〜Ｃを選別する場合を説明する。 In the present embodiment, a case will be described in which a PTC element C of CP = 80 ± 5 ° C. is added to the above-described PTC elements A and B, and each PTC element A to C is selected.
上記各ＰＴＣ素子Ａ〜Ｃに、最大電圧を２０Ｖに制限した１５ｍＡおよび１０ｍＡの定電流電源を接続し、その定電流となるＤＣ電圧を増加しつつ印加し、略熱平衡状態に達した時の各ＰＴＣ素子Ａ〜Ｃに印加される電圧値をオシロスコープで測定する。定電流１５ｍＡの時の電圧値が７〜９Ｖとなるか、あるいは上限の２０Ｖとなるかで見分けるとともに、定電流１０ｍＡの時の電圧値が６〜８Ｖ又は７〜９Ｖとなるか、あるいは上限の２０Ｖとなるかで見分ける。即ち、定電流１５ｍＡを流すと、ＰＴＣ素子Ｂの場合は電圧値が規格の７〜９Ｖとなるのに対して、ＰＴＣ素子Ａ，Ｃは上限の２０Ｖとなる。一方、定電流１０ｍＡを流すと、ＰＴＣ素子Ｂの場合は電圧値が規格の６〜８Ｖ、ＰＴＣ素子Ａの場合は７〜９Ｖとなるのに対して、ＰＴＣ素子Ｃの場合は上限の２０Ｖとなっている。 Each of the PTC elements A to C is connected to a constant current power source of 15 mA and 10 mA whose maximum voltage is limited to 20 V, and is applied while increasing the DC voltage that becomes the constant current, and each of the PTC elements A to C when a substantially thermal equilibrium state is reached. The voltage value applied to the PTC elements A to C is measured with an oscilloscope. Whether the voltage value when the constant current is 15 mA is 7 to 9 V or the upper limit is 20 V, and the voltage value when the constant current is 10 mA is 6 to 8 V or 7 to 9 V, or the upper limit is Distinguish by 20V. That is, when a constant current of 15 mA is passed, in the case of the PTC element B, the voltage value becomes 7 to 9 V of the standard, whereas the PTC elements A and C have an upper limit of 20 V. On the other hand, when a constant current of 10 mA is applied, the voltage value of the PTC element B is 6 to 8 V as a standard, and the voltage value of the PTC element A is 7 to 9 V, whereas the upper limit is 20 V in the case of the PTC element C. It has become.
このように本実施形態によれば、各ＰＴＣ素子Ａ〜Ｃに値の異なる２つの定電流を流し、略熱平衡状態に達した時の各ＰＴＣ素子Ａ〜Ｃのそれぞれの電圧値の相違によって特性を選別したので、選別精度を高めることができ、部品管理の効率をより一層高めることができる。 As described above, according to the present embodiment, two constant currents having different values are supplied to the PTC elements A to C, and the characteristics are determined by the difference in voltage values of the PTC elements A to C when a substantially thermal equilibrium state is reached. Therefore, the sorting accuracy can be improved and the efficiency of parts management can be further increased.
本実施例１では、ＰＴＣ素子Ａを１００００個準備し、このなかにＰＴＣ素子ＢとＰＴＣ素子Ｃをそれぞれ５個混入し、各ＰＴＣ素子Ａ〜Ｃの選別を行なった。そして定電流１５ｍＡの測定条件で規格２０Ｖ以外の素子を選別するとともに、定電流１０ｍＡの測定条件で規格２０Ｖの素子を選別した。 In Example 1 , 10,000 PTC elements A were prepared, five PTC elements B and C were mixed therein, and the PTC elements A to C were selected. Then, elements other than the standard 20V were selected under the measurement condition of the constant current of 15 mA, and elements of the standard 20V were selected under the measurement condition of the constant current of 10 mA.
その結果、定電流１５ｍＡの測定条件で規格２０Ｖから外れた素子は５個存在した。表３にこれら各素子について１５ｍＡの定電流電源に接続したときの電流値（Ｖ15mA）と別途測定したキュリー温度を示す。表３から分かるように、試料番号2 １〜2 ５の各素子は何れもＣＰが１２０±５℃内のＰＴＣ素子Ｂであった。一方、定電流１０ｍＡの測定条件で規格２０Ｖから外れた素子は５個存在した。表４にこれら各素子について１０ｍＡの定電流電源に接続したときの電流値（Ｖ10mA）と別途測定したキュリー温度を示す。表４から分かるように、試料番号３１〜3 ５の各素子は何れもＣＰが８０±５℃内のＰＴＣ素子Ｃであった。 As a result, there were five elements that deviated from the standard 20 V under the measurement condition of a constant current of 15 mA. Table 3 shows the current value (V15 mA) and the separately measured Curie temperature when these elements are connected to a constant current power source of 15 mA. As can be seen from Table 3, all of the elements of Sample Nos. 21 to 25 were PTC elements B with CP within 120 ± 5 ° C. On the other hand, there were five elements that deviated from the standard 20 V under the measurement condition of a constant current of 10 mA. Table 4 shows the current value (V10 mA) and the separately measured Curie temperature when these elements are connected to a 10 mA constant current power source. As can be seen from Table 4, each of the elements of sample numbers 31 to 35 was a PTC element C having a CP of 80 ± 5 ° C.
ここで、上記各実施形態では、ＰＴＣ素子の静特性である電流−電圧特性を利用して選別を行なうようにしたが、本発明では、上述の選別方法に加えて以下の動特性又はキュリー温度，抵抗温度特性を利用した選別方法を組み合わせることも可能である。 Here, in each of the above embodiments, the selection is performed using the current-voltage characteristic which is the static characteristic of the PTC element. However, in the present invention, in addition to the above-described selection method, the following dynamic characteristic or Curie temperature is used. It is also possible to combine sorting methods using resistance temperature characteristics.
動特性による選別方法には、（１）各ＰＴＣ素子に電流が十分減衰する所定の電圧を印加し、上記各ＰＴＣ素子が所定の電流値に至る時間の相違によって各ＰＴＣ素子の特性を選別する。（２）各ＰＴＣ素子に電流が十分減衰する所定の電圧を印加し、所定の時間を経過した時の電流値の相違によって上記各ＰＴＣ素子の特性を選別する。（３）各ＰＴＣ素子が複数の所定の電流値に至るそれぞれの時間の相違によって上記各ＰＴＣ素子の特性を選別する。（４）各ＰＴＣ素子に電流が十分に減衰する所定の電圧を印加し、複数の所定の時間を経過した後のそれぞれの電流値の相違によって上記各ＰＴＣ素子の特性を選別する。（５）各ＰＴＣ素子に電流が十分に減衰する複数の所定の電圧を印加し、上記各ＰＴＣ素子が所定の電流値に至るそれぞれの時間の相違によって各ＰＴＣ素子の特性を選別する。（６）各ＰＴＣ素子に電流が十分に減衰する複数の所定の電圧を印加し、所定の時間を経過した時のそれぞれの電流値の相違によって上記各ＰＴＣ素子の特性を選別する、等の方法が採用できる。 In the selection method based on dynamic characteristics, (1) a predetermined voltage at which a current is sufficiently attenuated is applied to each PTC element, and the characteristics of each PTC element are selected based on a difference in time until each PTC element reaches a predetermined current value. . (2) A predetermined voltage at which current is sufficiently attenuated is applied to each PTC element, and the characteristics of each PTC element are selected based on the difference in current value when a predetermined time has elapsed. (3) The characteristics of the PTC elements are selected based on the difference in time for each PTC element to reach a plurality of predetermined current values. (4) A predetermined voltage at which the current is sufficiently attenuated is applied to each PTC element, and the characteristics of each PTC element are selected based on the difference in current value after a plurality of predetermined times have elapsed. (5) A plurality of predetermined voltages at which current is sufficiently attenuated are applied to the respective PTC elements, and the characteristics of the respective PTC elements are selected based on differences in time required for the respective PTC elements to reach a predetermined current value. (6) A method of applying a plurality of predetermined voltages at which current is sufficiently attenuated to each PTC element, and selecting the characteristics of each PTC element based on a difference in each current value when a predetermined time has elapsed. Can be adopted.
またキュリー温度，抵抗温度特性による選別方法には、（１) 各ＰＴＣ素子に電圧を印加して該各ＰＴＣ素子の自己発熱によって抵抗値を上昇させ、所定の抵抗値になった時の上記各ＰＴＣ素子の抵抗値及び温度を測定し、該各ＰＴＣ素子のキュリー温度の相違によって特性を選別する。（２）各ＰＴＣ素子に印加する電圧を可変させ、該各ＰＴＣ素子の自己発熱によって抵抗値を上昇させ、一定時間経過後における上記各ＰＴＣ素子の温度を測定し、該各ＰＴＣ素子のキュリー温度の相違によって特性を選別する、等の方法が採用できる。 The selection method based on the Curie temperature and resistance temperature characteristics is as follows. (1) A voltage is applied to each PTC element, and the resistance value is increased by self-heating of each PTC element. The resistance value and temperature of the PTC element are measured, and the characteristics are selected based on the difference in Curie temperature of each PTC element. (2) Varying the voltage applied to each PTC element, increasing the resistance value by self-heating of each PTC element, measuring the temperature of each PTC element after a lapse of a certain time, and measuring the Curie temperature of each PTC element It is possible to adopt a method such as selecting the characteristics based on the difference between the two.
１ ＰＴＣ素子
Ａ ＣＰ１００±５℃のＰＴＣ素子
Ｂ ＣＰ１２０±５℃のＰＴＣ素子
Ｃ ＣＰ８０±５℃のＰＴＣ素子
1 PTC element A CP100 ± 5 ° C PTC element B CP120 ± 5 ° C PTC element C CP80 ± 5 ° C PTC element
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