JP5695195B2 - 電流センサ用基板及び電流センサ - Google Patents
電流センサ用基板及び電流センサ Download PDFInfo
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Description
図2に、第1の実施形態に係る電流センサを示す。電流センサ200は、U字形の電流経路210Aを有する一次導体210と、ホール素子等の磁電変換素子230Aを支持するための支持部220A、及びリード端子220B_1,220B_2を有する信号端子側部材220(以下、単に「部材220」と略記する。)と、支持部220Aに配置された、電流経路210Aを流れる電流から生じる磁束を検出する磁電変換素子230Aを有するICチップ230とを備える。一次導体210、部材220、及びICチップ230を樹脂240でモールドして、電流センサ200が形成される。ICチップ230及び樹脂240を除いた部分が電流センサ用基板である。
Vo1=k1×(B1s+B1n)+Vu1
Vo2=k2×(-B2s+B2n)+Vu2
となる。但し、k1、k2は各々の感度係数、Vu1、Vu2は各々のオフセット値である。
Vo=Vo1-Vo2=k×(B1s+B2s)
となり、外来磁場によるノイズが消えるとともに、U字形内側の第1の磁電変換素子630Aのみの場合よりも大きな信号が得られるので、感度向上につながる。
Vo=Vo1-(Vo2+Vo3)/2=k×(B1s+(B2s+B3s)/2)
となり、2つの場合と同様に外来磁場によるノイズが消え感度も向上するとともに、1次導体210とICチップ730の位置関係が3つの磁電変換素子の配置方向にズレが生じた場合でも、出力Voの変動レベルを極力抑えることができるようになる。
図8に、第2の実施形態に係る電流センサを示す。電流センサ800が第1の実施形態の電流センサ200と異なるのは、ICチップ230が側面視において支持部220Aから突出する代わりに、部材220の支持部820Aが、切欠部820A’を有し、電流経路210Aが、平面視において切欠部820A’に配置されている点である。したがって、ICチップ230は突出しないものの、平面視において、ICチップ230と電流経路210Aは重複する。図9Aに側面図、図9Bに断面図を示す。第1の実施形態と比較して側面視において高さの異なる電流経路210Aが、平面視において切欠部820A’に配置されているためにリードフレームのスタンピング金型の加工が若干複雑になるが、ICチップ内の磁電変換素子の配置に自由度が生まれ、ICチップのより内側に配置できるようになるため、応力起因によるオフセットへの影響を低減することができる。また支持部とICチップとの接着面積が増えるためICチップをより安定に支持することが可能となる。
図10に、第3の実施形態に係る電流センサを示す。電流センサ1000が第1の実施形態の電流センサ200と異なるのは、部材220ではなく、一次導体210が段差部210Cを電流経路210Aに隣接する位置に有する点である。ICチップ230は、側面視において支持部220Aから突出しており、平面視において電流経路210Aと重複する。図11Aに側面図、図11Bに断面図を示す。
次に、電流センサの一実施形態として、電流検出感度を向上させつつ、外部磁場の侵入の抑制をも可能とするようにした電流センサについて図12および図13を参照して説明する。本実施形態の電流センサは、全体の構成は図2に示した第1の実施形態のものとほぼ同様であるが、磁性材料を有する構成が第1の実施形態のものと異なる。
次に、第5の実施形態について図14および図15を参照して説明する。
次に、第6の実施形態について図16および図17を参照して説明する。
上述した各実施形態にかかる電流センサは例示に過ぎず、以下に示すような変更を行うことが可能である。
210 一次導体
210A 電流経路
210B 一次導体端子
210C 段差部
220 信号端子側部材
220A 支持部
220B,220B_1,220B_2 リード端子
220C 段差部
230 ICチップ
230A 磁電変換素子
500A,500B,500C 電流センサ
520A,520B 段差部
630 ICチップ
630A 第1の磁電変換素子
630B 第2の磁電変換素子
800 電流センサ
820A 支持部
820A’ 切欠部
1000 電流センサ
Claims (21)
- U字形の電流経路を有する一次導体と、
磁電変換素子を支持するための支持部と、
前記支持部と接続するリード端子と、
を備え、
前記U字形の電流経路は、平面視において前記支持部と重複せず、且つ、
側面視において前記支持部と高さが異なるように形成されていることを特徴とする電流センサ用基板。 - 前記リード端子は、前記支持部と段差を介して接続していることを特徴とする請求項1に記載の電流センサ用基板。
- 前記支持部は、切欠部を有し、
前記U字形の電流経路は、平面視において前記切欠部に配置されていることを特徴とする請求項1又は2に記載の電流センサ用基板。 - 前記一次導体は、前記U字形の電流経路に接続する段差部を有することを特徴とする請求項1から3のいずれかに記載の電流センサ用基板。
- 平面視において前記U字形の電流経路と重なるように配置される磁性体材料を更に有することを特徴とする請求項1から4のいずれかに記載の電流センサ用基板。
- 前記U字形の電流経路を挟むように配置される磁性体材料を更に有することを特徴とする請求項5に記載の電流センサ用基板。
- 請求項1から4のいずれかに記載の電流センサ用基板と、
前記電流センサ用基板の前記支持部に配置された、前記電流センサ用基板の前記U字形の電流経路を流れる電流から生じる磁束を検出する磁電変換素子を有するICチップと
を備え、
前記磁電変換素子は、平面視において前記U字形の電流経路の前記U字形の内側に配置されていることを特徴とする電流センサ。 - 請求項5又は6に記載の電流センサ用基板と、
前記電流センサ用基板の前記支持部に配置された、前記電流センサ用基板の前記電流経路を流れる電流から生じる磁束を検出する磁電変換素子を有するICチップと
を備え、
前記磁電変換素子は、平面視において前記U字形の電流経路の前記U字形の内側に配置されていることを特徴とする電流センサ。 - 前記磁性体材料は前記ICチップの前記U字形の電流経路が配置されている側の面とは反対の面側に、前記磁電変換素子の一部もしくは全体を覆うように形成されていることを特徴とする請求項8に記載の電流センサ。
- 前記磁性体材料は、前記一次導体から離れて前記支持部上に形成されていることを特徴とする請求項8又は9に記載の電流センサ。
- 前記磁性体材料は、磁性体メッキまたは磁性体チップで構成されていることを特徴とする請求項8から10のいずれかに記載の電流センサ。
- 前記ICチップは、側面視において前記支持部から突出していることを特徴とする請求項7から11のいずれかに記載の電流センサ。
- 前記ICチップは、平面視において前記電流経路と重複しており、前記磁電変換素子は、平面視において前記U字形の電流経路の前記U字形の内側に配置されていることを特徴とする請求項12に記載の電流センサ。
- 前記ICチップは、側面視において前記U字形の電流経路と所定の間隔をもって配置されていることを特徴とする請求項12又は13に記載の電流センサ。
- 前記一次導体は前記ICチップを支持していないことを特徴とする請求項12から14のいずれかに記載の電流センサ。
- 前記電流センサ用基板の前記支持部は、切欠部を有し、
前記電流センサ用基板の前記U字形の電流経路は、平面視において前記切欠部に配置されており、かつ、前記ICチップと重複することを特徴とする請求項7から11のいずれかに記載の電流センサ。 - 前記磁電変換素子は、ホール素子であることを特徴とする請求項7から16のいずれかに記載の電流センサ。
- 前記ICチップは、前記電流経路のU字形の外側であって前記電流経路に近接する位置に配置された第2の磁電変換素子をさらに備えることを特徴とする請求項7から17のいずれかに記載の電流センサ。
- 前記磁電変換素子は、信号処理回路を含むホールICまたは磁気抵抗ICであることを特徴とする請求項7から18のいずれかに記載の電流センサ。
- 前記電流センサ用基板の一次導体と前記ICチップとの間に形成される絶縁部材をさらに有することを特徴とする請求項7から19のいずれかに記載の電流センサ。
- 前記絶縁部材は、絶縁テープであることを特徴とする請求項20に記載の電流センサ。
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