JP2009271034A - Ac current detection circuit - Google Patents

Ac current detection circuit Download PDF

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JP2009271034A
JP2009271034A JP2008124415A JP2008124415A JP2009271034A JP 2009271034 A JP2009271034 A JP 2009271034A JP 2008124415 A JP2008124415 A JP 2008124415A JP 2008124415 A JP2008124415 A JP 2008124415A JP 2009271034 A JP2009271034 A JP 2009271034A
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voltage
circuit
alternating current
detection circuit
current
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Takehiko Tsunoda
武彦 角田
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Toyota Industries Corp
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Toyota Industries Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide an AC current detection circuit which does not need to consider operating delay of a circuit for obtaining a zero-cross point in obtaining a certain value by using an absolute value of an AC current and the zero-cross point of the AC current. <P>SOLUTION: The AC current detection circuit 1 includes a current-voltage conversion circuit 3 having resistances 6, 7 serially connected to each other wherein an AC voltage depending on an AC current output from an inverter 20 is applied on the entire resistances 6, 7, a dividing circuit 4 for dividing a reference voltage VCC in halves and outputting to a connection point of the resistances 6, 7, and an absolute value circuit 5 having npn bipolar transistors 11, 12 in which the reference voltage VCC is applied on respective collectors and respective emitters are connected to each other, and which fullwave-rectifies the AC voltage by the npn bipolar transistors 11, 12 and outputs as the absolute value of the AC current. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、入力される交流電流の絶対値を出力する交流電流検出回路に関する。   The present invention relates to an alternating current detection circuit that outputs an absolute value of an input alternating current.

例えば、交流電流検出回路として、入力される交流電流を電圧に変換する電流−電圧変換回路と、その電流−電圧変換回路から出力される交流電圧の絶対値を出力する絶対値回路とを備えるものがある。   For example, the AC current detection circuit includes a current-voltage conversion circuit that converts an input AC current into a voltage, and an absolute value circuit that outputs an absolute value of the AC voltage output from the current-voltage conversion circuit. There is.

また、交流電流検出回路が利用される構成の一例として、図２に示すように、インバータ２０からモータ２１へ出力される３相の交流電流のうちの１相の交流電流を電流検出器２２で検出し、交流電流検出回路２３において電流検出器２２で検出された交流電流の絶対値を得るとともに、ゼロクロス検出回路２４において電流検出器２２で検出された交流電流のゼロクロス点を得た後、電流演算部２５において交流電流検出回路２３で得られた電圧とゼロクロス検出回路２４で得られたゼロクロス点と電圧指令部２６から出力される指令電圧とに基づいてトルク電流を求めるものがある（例えば、特許文献１参照）。
特開平９−２１８２２６号公報 As an example of the configuration in which the AC current detection circuit is used, as shown in FIG. 2, a current detector 22 converts one-phase AC current out of the three-phase AC current output from the inverter 20 to the motor 21. After obtaining the absolute value of the alternating current detected by the current detector 22 in the alternating current detection circuit 23 and obtaining the zero cross point of the alternating current detected by the current detector 22 in the zero cross detection circuit 24, the current is detected. There is an arithmetic unit 25 that obtains torque current based on the voltage obtained by the alternating current detection circuit 23, the zero cross point obtained by the zero cross detection circuit 24, and the command voltage output from the voltage command unit 26 (for example, Patent Document 1).
JP-A-9-218226

しかしながら、図２に示すように、交流電流の絶対値と交流電流のゼロクロス点とを用いてある値を求める際に、ゼロクロス点を得るための回路の動作遅延を考慮すると、ゼロクロス点を補正するための回路が必要になりコストが増大してしまうというという問題がある。   However, as shown in FIG. 2, when obtaining a certain value using the absolute value of the alternating current and the zero cross point of the alternating current, the zero cross point is corrected in consideration of the operation delay of the circuit for obtaining the zero cross point. Therefore, there is a problem that a circuit for this is required and the cost increases.

そこで、本発明では、交流電流の絶対値と交流電流のゼロクロス点とを用いてある値を求める際に、ゼロクロス点を得るための回路の動作遅延を考慮する必要が無い交流電流検出回路を提供することを目的とする。   Therefore, the present invention provides an AC current detection circuit that does not need to consider the operation delay of the circuit for obtaining the zero cross point when obtaining a certain value using the absolute value of the AC current and the zero cross point of the AC current. The purpose is to do.

上記の課題を解決するために本発明では、以下のような構成を採用した。
すなわち、本発明の交流電流検出回路は、互いに直列接続される第１及び第２の抵抗を有し、所定の回路から出力される交流電流を交流電圧に変換する電流−電圧変換回路と、基準電圧を１／２に分圧して前記第１及び第２の抵抗の接続点に出力する分圧回路と、それぞれのコレクタに前記基準電圧がかかりそれぞれのエミッタが互いに接続される第１及び第２のトランジスタを有し、前記第１及び第２のトランジスタにより前記交流電圧を全波整流し前記交流電流の絶対値として出力する絶対値回路とを備える。 In order to solve the above problems, the present invention adopts the following configuration.
That is, the alternating current detection circuit of the present invention includes first and second resistors connected in series to each other, a current-voltage conversion circuit that converts an alternating current output from a predetermined circuit into an alternating voltage, and a reference A voltage dividing circuit that divides the voltage by half and outputs the divided voltage to the connection point of the first and second resistors, and a first and a second that connect the emitters to each other by applying the reference voltage to each collector. And an absolute value circuit for full-wave rectifying the AC voltage by the first and second transistors and outputting the rectified current as an absolute value of the AC current.

これにより、第１及び第２の抵抗全体にかかる交流電圧のゼロクロス点が基準電圧の１／２になるので、交流電流のゼロクロス点を得るための回路を別途備える必要がなくなる。そのため、交流電流の絶対値と交流電流のゼロクロス点とを用いてある値を求める際に、ゼロクロス点を得るための回路の動作遅延を考慮する必要が無くなる。   As a result, the zero-cross point of the alternating voltage applied to the entire first and second resistors is ½ of the reference voltage, so that it is not necessary to separately provide a circuit for obtaining the zero-cross point of the alternating current. For this reason, when obtaining a certain value using the absolute value of the alternating current and the zero cross point of the alternating current, it is not necessary to consider the operation delay of the circuit for obtaining the zero cross point.

また、前記分圧回路は、前記基準電圧を１／２に分圧する第３及び第４の抵抗と、前記第３及び第４の抵抗により分圧された電圧を１倍して前記第１及び第２の抵抗の接続点に出力するオペアンプとを備えるように構成してもよい。   The voltage dividing circuit is configured to multiply the voltage divided by the third and fourth resistors by three times the third and fourth resistors that divide the reference voltage by half, and An operational amplifier that outputs to the connection point of the second resistor may be provided.

また、前記絶対値回路は、コレクタに前記基準電圧がかかりエミッタが前記第１及び第２のトランジスタのそれぞれのエミッタに接続される第３のトランジスタを備えるように構成してもよい。   The absolute value circuit may include a third transistor in which the reference voltage is applied to the collector and the emitter is connected to the respective emitters of the first and second transistors.

また、上記交流電流検出回路は、前記所定の回路から出力される交流電流がカレントトランスを介して前記第１及び第２の抵抗に流れるように構成してもよい。
また、上記交流電流検出回路は、前記所定の回路から出力される交流電流が直接前記第１及び第２の抵抗に流れるように構成してもよい。 The alternating current detection circuit may be configured such that an alternating current output from the predetermined circuit flows to the first and second resistors via a current transformer.
The alternating current detection circuit may be configured such that an alternating current output from the predetermined circuit flows directly to the first and second resistors.

本発明によれば、交流電流の絶対値と交流電流のゼロクロス点とを用いてある値を求める際に、ゼロクロス点を得るための回路の動作遅延を考慮する必要を無くすことができる。   According to the present invention, when obtaining a certain value using the absolute value of the alternating current and the zero cross point of the alternating current, it is possible to eliminate the need to consider the operation delay of the circuit for obtaining the zero cross point.

以下、図面を用いて本発明の実施形態を説明する。
図１は、本発明の実施形態の交流電流検出回路を示す図である。
図１に示す交流電流検出回路１は、カレントトランス２と、電流−電圧変換回路３と、分圧回路４と、絶対値回路５とを備えて構成されている。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a diagram illustrating an alternating current detection circuit according to an embodiment of the present invention.
The alternating current detection circuit 1 shown in FIG. 1 includes a current transformer 2, a current-voltage conversion circuit 3, a voltage dividing circuit 4, and an absolute value circuit 5.

電流−電圧変換回路３は、抵抗６（第１の抵抗）と、抵抗７（第２の抵抗）とを備えて構成されている。
すなわち、抵抗６、７は互いに直列接続されてカレントトランス２の２次側コイルの両端の間に設けられている。カレントトランス２の１次側コイルにはインバータ２０（所定の回路）からモータ２１へ出力される３相の交流電流のうちの１相の交流電流が流れている。 The current-voltage conversion circuit 3 includes a resistor 6 (first resistor) and a resistor 7 (second resistor).
That is, the resistors 6 and 7 are connected in series with each other and provided between both ends of the secondary coil of the current transformer 2. One-phase AC current out of the three-phase AC current output from the inverter 20 (predetermined circuit) to the motor 21 flows through the primary coil of the current transformer 2.

分圧回路４は、抵抗８（第３の抵抗）と、抵抗９（第４の抵抗）と、オペアンプ１０とを備えて構成されている。
すなわち、抵抗８、９は互いに直列接続されて基準電圧ＶＣＣの電源とＧＮＤとの間に設けられている。抵抗８、９の接続点はオペアンプ１０のプラスの入力端子に接続されている。オペアンプ１０の出力端子はオペアンプ１０のマイナスの入力端子に接続されている。なお、オペアンプ１０の出力端子から出力される電圧が基準電圧ＶＣＣの１／２になるように、抵抗８、９のそれぞれの抵抗値やオペアンプ１０の電気的特性が設定されているものとする。 The voltage dividing circuit 4 includes a resistor 8 (third resistor), a resistor 9 (fourth resistor), and an operational amplifier 10.
That is, the resistors 8 and 9 are connected in series with each other and provided between the power source of the reference voltage VCC and GND. The connection point of the resistors 8 and 9 is connected to the positive input terminal of the operational amplifier 10. The output terminal of the operational amplifier 10 is connected to the negative input terminal of the operational amplifier 10. It is assumed that the resistance values of the resistors 8 and 9 and the electrical characteristics of the operational amplifier 10 are set so that the voltage output from the output terminal of the operational amplifier 10 is ½ of the reference voltage VCC.

絶対値回路５は、ｎｐｎバイポーラトランジスタ１１（第１のトランジスタ）と、ｎｐｎバイポーラトランジスタ１２（第２のトランジスタ）と、ｎｐｎバイポーラトランジスタ１３（第３のトランジスタ）と、抵抗１４、１５と、コンデンサ１６とを備えて構成されている。   The absolute value circuit 5 includes an npn bipolar transistor 11 (first transistor), an npn bipolar transistor 12 (second transistor), an npn bipolar transistor 13 (third transistor), resistors 14 and 15, and a capacitor 16 And is configured.

すなわち、ｎｐｎバイポーラトランジスタ１１のベースは抵抗６及びカレントトランス２の２次側コイルの一方端に接続されている。ｎｐｎバイポーラトランジスタ１２のベースは抵抗７及びカレントトランス２の２次側コイルの他方端に接続されている。ｎｐｎバイポーラトランジスタ１１〜１３のそれぞれのエミッタは互いに接続され、その接続点Ａは抵抗１４を介してＧＮＤに接続されている。ｎｐｎバイポーラトランジスタ１１、１２のそれぞれのコレクタは互いに接続され、その接続点は基準電圧ＶＣＣの電源に接続されている。ｎｐｎバイポーラトランジスタ１３のコレクタは抵抗１５を介して基準電圧ＶＣＣの電源に接続されているとともに、ｎｐｎバイポーラトランジスタ１３のベースに接続されている。コンデンサ１６は、ｎｐｎバイポーラトランジスタ１３のコレクタとＧＮＤとの間に設けられている。   That is, the base of the npn bipolar transistor 11 is connected to one end of the resistor 6 and the secondary coil of the current transformer 2. The base of the npn bipolar transistor 12 is connected to the resistor 7 and the other end of the secondary coil of the current transformer 2. The emitters of npn bipolar transistors 11 to 13 are connected to each other, and the connection point A is connected to GND via a resistor 14. The collectors of npn bipolar transistors 11 and 12 are connected to each other, and the connection point is connected to the power source of reference voltage VCC. The collector of the npn bipolar transistor 13 is connected to the power source of the reference voltage VCC via the resistor 15 and is connected to the base of the npn bipolar transistor 13. Capacitor 16 is provided between the collector of npn bipolar transistor 13 and GND.

なお、抵抗６、７のそれぞれの抵抗値は抵抗１４の抵抗値よりも十分に小さいものとする。また、コンデンサ１６はノイズキャンセル用とする。また、ｎｐｎバイポーラトランジスタ１１〜１３はベース−エミッタ間電圧や温度特性が互いに同じになるように構成されているものとする。このように、ｎｐｎバイポーラトランジスタ１１〜１３を構成することにより、オペアンプを用いて絶対値回路５を構成する場合と比較しても遜色無い電圧精度を得ることができる。   Note that the resistance values of the resistors 6 and 7 are sufficiently smaller than the resistance value of the resistor 14. The capacitor 16 is for noise cancellation. The npn bipolar transistors 11 to 13 are configured to have the same base-emitter voltage and temperature characteristics. As described above, by configuring the npn bipolar transistors 11 to 13, voltage accuracy comparable to that in the case where the absolute value circuit 5 is configured using an operational amplifier can be obtained.

次に、交流電流検出回路１の動作について説明する。
まず、カレントトランス２の１次側コイルに交流電流が流れると、カレントトランス２の１次側コイルと２次側コイルの巻き線比に比例した交流電流がカレントトランス２の２次側コイルに発生する。 Next, the operation of the alternating current detection circuit 1 will be described.
First, when an alternating current flows through the primary side coil of the current transformer 2, an alternating current proportional to the winding ratio between the primary side coil and the secondary side coil of the current transformer 2 is generated in the secondary side coil of the current transformer 2. To do.

次に、抵抗６、７のそれぞれの抵抗値が抵抗１４の抵抗値よりも十分に小さいことから、カレントトランス２の２次側コイルに流れる交流電流と抵抗６、７のそれぞれの抵抗値の合計とに比例した交流電圧が抵抗６、７全体にかかる。すなわち、ｎｐｎバイポーラトランジスタ１１のベースに基準電圧ＶＣＣの１／２の電圧をゼロクロス点とする交流電圧（１）が入力され、ｎｐｎバイポーラトランジスタ１２のベースに基準電圧ＶＣＣの１／２の電圧をゼロクロス点とする交流電圧（１）が反転したものである交流電圧（２）が入力される。   Next, since the resistance values of the resistors 6 and 7 are sufficiently smaller than the resistance value of the resistor 14, the sum of the alternating current flowing through the secondary coil of the current transformer 2 and the resistance values of the resistors 6 and 7 is the sum. An AC voltage proportional to is applied across the resistors 6 and 7. That is, an AC voltage (1) having a zero-crossing point as a half voltage of the reference voltage VCC is input to the base of the npn bipolar transistor 11, and a half voltage of the reference voltage VCC is zero-crossed to the base of the npn bipolar transistor 12. An AC voltage (2) that is an inverted version of the AC voltage (1) as a point is input.

次に、ｎｐｎバイポーラトランジスタ１１のベースに入力される交流電圧（１）がｎｐｎバイポーラトランジスタ１２のベースに入力される交流電圧（２）よりも大きいとき、接続点Ａの電圧（＝交流電圧（１）−（ベース−エミッタ間電圧））がｎｐｎバイポーラトランジスタ１３によりベース−エミッタ間電圧分上昇し交流電圧（１）がｎｐｎバイポーラトランジスタ１３のコレクタに発生する。また、ｎｐｎバイポーラトランジスタ１２のベースに入力される交流電圧（２）がｎｐｎバイポーラトランジスタ１１のベースに入力される交流電圧（１）よりも大きいとき、接続点Ａの電圧（＝交流電圧（２）−（ベース−エミッタ間電圧））がｎｐｎバイポーラトランジスタ１３によりベース−エミッタ間電圧分上昇し交流電圧（２）がｎｐｎバイポーラトランジスタ１３のコレクタに発生する。すなわち、絶対値回路５に入力される交流電圧が全波整流されたものがｎｐｎバイポーラトランジスタ１３のコレクタに発生する。   Next, when the AC voltage (1) input to the base of the npn bipolar transistor 11 is larger than the AC voltage (2) input to the base of the npn bipolar transistor 12, the voltage at the connection point A (= AC voltage (1 )-(Base-emitter voltage)) is increased by the base-emitter voltage by the npn bipolar transistor 13, and an alternating voltage (1) is generated at the collector of the npn bipolar transistor 13. When the AC voltage (2) input to the base of the npn bipolar transistor 12 is larger than the AC voltage (1) input to the base of the npn bipolar transistor 11, the voltage at the connection point A (= AC voltage (2)). -(Base-emitter voltage)) is increased by the base-emitter voltage by the npn bipolar transistor 13, and an alternating voltage (2) is generated at the collector of the npn bipolar transistor 13. That is, a full-wave rectified AC voltage input to the absolute value circuit 5 is generated at the collector of the npn bipolar transistor 13.

このように、本実施形態の交流電流検出回路１は、カレントトランス２で検出された交流電流に応じた交流電圧を電流−電圧変換回路３により得た後、その交流電圧が全波整流されたものを絶対値回路５から交流電圧の絶対値として出力させることができる。   As described above, the alternating current detection circuit 1 of the present embodiment obtains an alternating voltage corresponding to the alternating current detected by the current transformer 2 by the current-voltage conversion circuit 3, and then the alternating voltage is full-wave rectified. Can be output from the absolute value circuit 5 as the absolute value of the AC voltage.

また、本実施形態の交流電流検出回路１は、抵抗６、７の接続点にかかる電圧を基準電圧ＶＣＣの１／２にしているので、抵抗６、７全体にかかる交流電圧のゼロクロス点を基準電圧の１／２にすることができ、交流電流のゼロクロス点を得るための回路を別途備える必要がなくなる。そのため、交流電流の絶対値と交流電流のゼロクロス点とを用いてある値を求める際に、ゼロクロス点を得るための回路の動作遅延を考慮する必要が無くなる。これにより、交流電流のゼロクロス点を得るための回路や交流電流のゼロクロス点を補正するための回路を備える必要が無くなるので、その分コストが増大することを抑えることができる。   Moreover, since the voltage applied to the connection point of the resistors 6 and 7 is ½ of the reference voltage VCC, the AC current detection circuit 1 of the present embodiment uses the zero cross point of the AC voltage applied to the resistors 6 and 7 as a reference. The voltage can be halved, and there is no need to separately provide a circuit for obtaining the zero cross point of the alternating current. For this reason, when obtaining a certain value using the absolute value of the alternating current and the zero cross point of the alternating current, it is not necessary to consider the operation delay of the circuit for obtaining the zero cross point. As a result, there is no need to provide a circuit for obtaining a zero-cross point of the alternating current and a circuit for correcting the zero-cross point of the alternating current, so that an increase in cost can be suppressed.

また、本実施形態の交流電流検出回路１は、絶対値回路５をｎｐｎバイポーラトランジスタ１１〜１３により構成しているため、オペアンプを用いて同コストで絶対値回路を構成する場合に比べて、絶対値回路５の応答速度を速くすることができ、絶対値の遅れ時間を小さくすることができる。   Further, in the alternating current detection circuit 1 according to the present embodiment, the absolute value circuit 5 is configured by npn bipolar transistors 11 to 13, so that the absolute value circuit 5 is absolute compared to the case where the absolute value circuit is configured at the same cost using an operational amplifier. The response speed of the value circuit 5 can be increased, and the delay time of the absolute value can be reduced.

なお、上記実施形態では、インバータ２０からモータ２１へ出力される交流電流の絶対値を得る構成であるが、Ｈブリッジコンバータなどの交流動作する回路から出力される交流電流の絶対値を得るように構成してもよい。   In the above embodiment, the absolute value of the alternating current output from the inverter 20 to the motor 21 is obtained. However, the absolute value of the alternating current output from a circuit operating in an alternating current such as an H-bridge converter is obtained. It may be configured.

また、上記実施形態では、カレントトランス２により検出される交流電流の絶対値を得る構成であるが、カレントトランス２を省略し、抵抗６、７を直接インバータ２０とモータ２１との間に接続してもよい。   In the above embodiment, the absolute value of the alternating current detected by the current transformer 2 is obtained. However, the current transformer 2 is omitted, and the resistors 6 and 7 are directly connected between the inverter 20 and the motor 21. May be.

また、上記実施形態において、ｎｐｎバイポーラトランジスタ１１、１２により全波整流された電圧のレベルを調整することが可能な回路が絶対値回路５の出力先にある場合、ｎｐｎバイポーラトランジスタ１３や抵抗１５などを省略してもよい。   Further, in the above embodiment, when the circuit capable of adjusting the level of the full-wave rectified voltage by the npn bipolar transistors 11 and 12 is at the output destination of the absolute value circuit 5, the npn bipolar transistor 13, the resistor 15, etc. May be omitted.

本発明の実施形態の交流電流検出回路を示す図である。It is a figure which shows the alternating current detection circuit of embodiment of this invention. 交流電流検出回路が利用される構成の一例を示す図である。It is a figure which shows an example of the structure by which an alternating current detection circuit is utilized.

符号の説明Explanation of symbols

１ 交流電流検出回路
２ カレントトランス
３ 電流−電圧変換回路
４ 分圧回路
５ 絶対値回路
６〜９ 抵抗
１０ オペアンプ
１１〜１３ ｎｐｎバイポーラトランジスタ
１４、１５ 抵抗
１６ コンデンサ
２０ インバータ
２１ モータ
２２ 電流検出器
２３ 交流電流検出回路
２４ ゼロクロス検出回路
２５ 電流演算部
２６ 電圧指令部 DESCRIPTION OF SYMBOLS 1 AC current detection circuit 2 Current transformer 3 Current-voltage conversion circuit 4 Voltage dividing circuit 5 Absolute value circuit 6-9 Resistance 10 Operational amplifier 11-13 npn bipolar transistor 14, 15 Resistance 16 Capacitor 20 Inverter 21 Motor 22 Current detector 23 AC Current detection circuit 24 Zero cross detection circuit 25 Current calculation unit 26 Voltage command unit

Claims (5)

互いに直列接続される第１及び第２の抵抗を有し、所定の回路から出力される交流電流を交流電圧に変換する電流−電圧変換回路と、
基準電圧を１／２に分圧して前記第１及び第２の抵抗の接続点に出力する分圧回路と、
それぞれのコレクタに前記基準電圧がかかりそれぞれのエミッタが互いに接続される第１及び第２のトランジスタを有し、前記第１及び第２のトランジスタにより前記交流電圧を全波整流し前記交流電流の絶対値として出力する絶対値回路と、
を備えることを特徴とする交流電流検出回路。 A current-voltage conversion circuit having first and second resistors connected in series with each other, and converting an alternating current output from a predetermined circuit into an alternating voltage;
A voltage dividing circuit that divides the reference voltage by half and outputs the divided voltage to the connection point of the first and second resistors;
The reference voltage is applied to each collector, and each emitter has a first and a second transistor connected to each other. The AC voltage is full-wave rectified by the first and second transistors, and the absolute value of the AC current is obtained. An absolute value circuit to output as a value,
An alternating current detection circuit comprising: 請求項１に記載の交流電流検出回路であって、
前記分圧回路は、前記基準電圧を１／２に分圧する第３及び第４の抵抗と、前記第３及び第４の抵抗により分圧された電圧を１倍して前記第１及び第２の抵抗の接続点に出力するオペアンプとを有する基準電圧発生回路と、
を備えることを特徴とする交流電流検出回路。 The alternating current detection circuit according to claim 1,
The voltage dividing circuit multiplies the first and second resistors by dividing a voltage divided by the third and fourth resistors by a third resistor and a fourth resistor that divide the reference voltage by half. A reference voltage generation circuit having an operational amplifier that outputs to a connection point of the resistors;
An alternating current detection circuit comprising: 請求項１又は請求項２に記載の交流電流検出回路であって、
前記絶対値回路は、コレクタに前記基準電圧がかかりエミッタが前記第１及び第２のトランジスタのそれぞれのエミッタに接続される第３のトランジスタを備える
ことを特徴とする交流電流検出回路。 The alternating current detection circuit according to claim 1 or 2,
The absolute value circuit includes a third transistor in which the reference voltage is applied to a collector and an emitter is connected to the emitter of each of the first and second transistors. 請求項１〜３の何れか１項に記載の交流電流検出回路であって、
前記所定の回路から出力される交流電流がカレントトランスを介して前記第１及び第２の抵抗に流れる
ことを特徴とする交流電流検出回路。 The alternating current detection circuit according to any one of claims 1 to 3,
An alternating current detection circuit, wherein an alternating current output from the predetermined circuit flows to the first and second resistors via a current transformer. 請求項１〜３の何れか１項に記載の交流電流検出回路であって、
前記所定の回路から出力される交流電流が直接前記第１及び第２の抵抗に流れる
ことを特徴とする交流電流検出回路。 The alternating current detection circuit according to any one of claims 1 to 3,
An AC current detection circuit, wherein an AC current output from the predetermined circuit flows directly to the first and second resistors.
JP2008124415A 2008-05-12 2008-05-12 Ac current detection circuit Pending JP2009271034A (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102645576A (en) * 2012-05-17 2012-08-22 合肥工业大学 Device and method for detecting zero crossing point of inductive current
CN102662104A (en) * 2012-04-18 2012-09-12 华为技术有限公司 Zero-crossing detection method and circuit
CN105182138A (en) * 2015-09-28 2015-12-23 国网甘肃省电力公司 Power inductor element inductance and saturation current measurement circuit

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JPH032676A (en) * 1989-05-31 1991-01-09 Mitsubishi Electric Corp Full-wave rectifier circuit
JPH07235845A (en) * 1994-02-24 1995-09-05 Fuji Electric Co Ltd Noninverting amplifier circuit
JP2005283232A (en) * 2004-03-29 2005-10-13 Shin Meiwa Ind Co Ltd Current detector and submerged pump system

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JPS59213275A (en) * 1983-05-19 1984-12-03 Furukawa Battery Co Ltd:The Converter device
JPH02236185A (en) * 1989-03-09 1990-09-19 Nec Corp Apparatus for confirming regenerative signal
JPH032676A (en) * 1989-05-31 1991-01-09 Mitsubishi Electric Corp Full-wave rectifier circuit
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Cited By (3)

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Publication number Priority date Publication date Assignee Title
CN102662104A (en) * 2012-04-18 2012-09-12 华为技术有限公司 Zero-crossing detection method and circuit
CN102645576A (en) * 2012-05-17 2012-08-22 合肥工业大学 Device and method for detecting zero crossing point of inductive current
CN105182138A (en) * 2015-09-28 2015-12-23 国网甘肃省电力公司 Power inductor element inductance and saturation current measurement circuit

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