JP2006238529A - Noise reduction circuit of motor driver ic - Google Patents

Noise reduction circuit of motor driver ic Download PDF

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Publication number
JP2006238529A
JP2006238529A JP2005045972A JP2005045972A JP2006238529A JP 2006238529 A JP2006238529 A JP 2006238529A JP 2005045972 A JP2005045972 A JP 2005045972A JP 2005045972 A JP2005045972 A JP 2005045972A JP 2006238529 A JP2006238529 A JP 2006238529A
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Prior art keywords
power supply
circuit
constant voltage
motor driver
voltage power
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JP2005045972A
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Japanese (ja)
Inventor
Hideki Sunaga
英樹 須永
Kaoru Tanaka
馨 田中
Shuji Hojo
周司 北條
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Marelli Corp
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Calsonic Kansei Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a noise reduction circuit of a motor driver IC that can reduce the generation of noise in a motor drive circuit, and can reduce radio noise even if an in-vehicle radio receiver is high in sensitivity. <P>SOLUTION: In the motor driver IC101 containing a constant-voltage power supply circuit 102, a first bypass capacitor C1 is connected between a power supply input terminal VCC of the motor driver IC101 and a ground terminal GND, a second bypass capacitor C2 is connected between a constant-voltage output terminal VREG of the constant-voltage power supply circuit 102 and the ground terminal GND, and a third bypass capacitor C3 is connected between the power supply input terminal VCC of the motor driver IC101 and the constant-voltage output terminal VREG of the constant-voltage power supply circuit 102. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、定電圧電源回路を内蔵したモータドライバＩＣのノイズ低減回路に関する。   The present invention relates to a noise reduction circuit of a motor driver IC incorporating a constant voltage power supply circuit.

自動車用空気調和装置（カーエアコン）では、電動モータ式アクチュエータを用いて各種ドアを回動させており、データ通信機能およびモータ制御機能を有するモータドライバＩＣを用いて電動モータを駆動するようにしている（例えば、特許文献１参照）。   In an automobile air conditioner (car air conditioner), various doors are rotated using an electric motor actuator, and an electric motor is driven using a motor driver IC having a data communication function and a motor control function. (For example, refer to Patent Document 1).

図４は従来のモータドライブ回路の構成を示す図である。モータドライブＩＣ１０１は、定電圧電源回路１０２と、ＬＩＮ入出力回路１０３と、クロック発生回路１０４と、ＬＩＮ通信およびモータ制御を行うロジック回路１０５と、Ｈ型ブリッジ回路１０６とを有している。ＶＣＣは例えば１２ボルトの電源入力端子、ＶＲＥＧは例えば５ボルトの定電圧電源出力端子、ＶＤＤはＣ−ＭＯＳプロセスで形成されたクロック発生回路１０４およびロジック回路１０５のロジック電源入力端子、ＧＮＤはグランド端子である。また、ＢＵＳはＬＩＮ入出力端子、ＭＴ１，ＭＴ２はモータＭの接続端子である。Ｃ１はＶＣＣ電源安定化用のバイパスコンデンサ、Ｃ２は定電圧電源安定化用のバイパスコンデンサである。定電圧電源出力端子ＶＲＥＧとロジック電源入力端子ＶＤＤとを直接接続することで、クロック発生回路１０４およびロジック回路１０５に例えば５ボルトの定電圧電源を供給している。
特開２００４−３５０４０８号公報 FIG. 4 is a diagram showing a configuration of a conventional motor drive circuit. The motor drive IC 101 includes a constant voltage power supply circuit 102, a LIN input / output circuit 103, a clock generation circuit 104, a logic circuit 105 that performs LIN communication and motor control, and an H-type bridge circuit 106. VCC is a power input terminal of 12 volts, VREG is a constant voltage power output terminal of 5 volts, VDD is a logic power input terminal of the clock generation circuit 104 and logic circuit 105 formed by a C-MOS process, and GND is a ground terminal. It is. BUS is a LIN input / output terminal, and MT1 and MT2 are connection terminals of the motor M. C1 is a bypass capacitor for stabilizing the VCC power supply, and C2 is a bypass capacitor for stabilizing the constant voltage power supply. A constant voltage power supply of, for example, 5 volts is supplied to the clock generation circuit 104 and the logic circuit 105 by directly connecting the constant voltage power supply output terminal VREG and the logic power supply input terminal VDD.
JP 2004-350408 A

従来のモータドライブ回路では、定電圧電源回路１０２の定電圧電源出力が発振し、この発振電流が増幅されてモータドライブＩＣ１０１の電源入力端子ＶＣＣ側から外部に出力されてしまい、車載の高感度ラジオ受信機からラジオノイズが発生することがある。図５に従来のモータドライブ回路が発生するノイズの電界強度の一例を示す。また、図６に従来のモータドライブ回路が発生するノイズ電流の一例を示す。図６（ａ）に示すように、ＬＩＮ入出力端子ＢＵＳの電圧レベルがしきい値以下になると定電圧電源回路１０２が動作状態になり、図６（ｂ）に示すように、定電圧電源出力端子ＶＲＥＧから定電圧電源出力が出力される。この電源立上りの際に、電源入力端子ＶＣＣからモータドライブＩＣ１０１に供給される電流（ＶＳＵＰ電流）が、図６（ｃ）に示すように、大きく変動し、これがラジオノイズの原因となる。   In the conventional motor drive circuit, the constant voltage power supply output of the constant voltage power supply circuit 102 oscillates, and this oscillation current is amplified and output to the outside from the power input terminal VCC side of the motor drive IC 101. Radio noise may be generated from the receiver. FIG. 5 shows an example of electric field strength of noise generated by a conventional motor drive circuit. FIG. 6 shows an example of noise current generated by a conventional motor drive circuit. As shown in FIG. 6 (a), when the voltage level of the LIN input / output terminal BUS becomes equal to or lower than the threshold value, the constant voltage power supply circuit 102 enters an operating state, and as shown in FIG. A constant voltage power supply output is output from the terminal VREG. At the time of power-on, the current (VSUP current) supplied from the power input terminal VCC to the motor drive IC 101 varies greatly as shown in FIG. 6C, which causes radio noise.

本発明は上記の事情に鑑みてなされたもので、モータドライブ回路から発生するノイズを低減することのできるモータドライバＩＣのノイズ低減回路を提供することを目的とする。   The present invention has been made in view of the above circumstances, and an object thereof is to provide a noise reduction circuit for a motor driver IC that can reduce noise generated from a motor drive circuit.

本発明に係るモータドライバＩＣのノイズ低減回路は、定電圧電源回路を内蔵したモータドライバＩＣにおいて、前記モータドライバＩＣの電源入力端子とグランド端子との間に第１のバイパスコンデンサを接続し、前記定電圧電源回路の定電圧出力端子と前記グランド端子との間に第２のバイパスコンデンサを接続し、前記モータドライバＩＣの電源入力端子と前記定電圧電源回路の定電圧出力端子との間に第３のバイパスコンデンサを接続する。   The noise reduction circuit of the motor driver IC according to the present invention is a motor driver IC having a built-in constant voltage power circuit, wherein a first bypass capacitor is connected between a power input terminal and a ground terminal of the motor driver IC, A second bypass capacitor is connected between the constant voltage output terminal of the constant voltage power supply circuit and the ground terminal, and the second bypass capacitor is connected between the power input terminal of the motor driver IC and the constant voltage output terminal of the constant voltage power supply circuit. 3 bypass capacitor is connected.

本発明によれば、定電圧電源出力の発振が低減され、モータドライブ回路から発生するノイズが低減される。   According to the present invention, oscillation of the constant voltage power supply output is reduced, and noise generated from the motor drive circuit is reduced.

以下、発明を実施するための最良の形態を実施例に基づいて説明する。   Hereinafter, the best mode for carrying out the invention will be described based on examples.

図１は本発明に係るモータドライブ回路の構成を示す図である。モータドライブＩＣ１０１は、定電圧電源回路１０２と、ＬＩＮ入出力回路１０３と、クロック発生回路１０４と、ＬＩＮ通信およびモータ制御を行うロジック回路１０５と、Ｈ型ブリッジ回路１０６とを有している。ＶＣＣは例えば１２ボルトの電源入力端子、ＶＲＥＧは例えば５ボルトの定電圧電源出力端子、ＶＤＤはＣ−ＭＯＳプロセスで形成されたクロック発生回路１０４およびロジック回路１０５のロジック電源入力端子、ＧＮＤはグランド端子である。また、ＢＵＳはＬＩＮ入出力端子、ＭＴ１，ＭＴ２はモータＭの接続端子である。Ｃ１は電源入力端子ＶＣＣとグランド端子ＧＮＤとの間に接続された第１のバイパスコンデンサ、Ｃ２は定電圧電源出力端子ＲＥＧとグランド端子ＧＮＤとの間に接続された第２のバイパスコンデンサ、Ｃ３は電源入力端子ＶＣＣと定電圧電源出力端子ＲＥＧとの間に接続された第３のバイパスコンデンサである。定電圧電源出力端子ＶＲＥＧとロジック電源入力端子ＶＤＤとを接続することで、クロック発生回路１０４およびロジック回路１０５に例えば５ボルトの定電圧電源を供給している。   FIG. 1 is a diagram showing a configuration of a motor drive circuit according to the present invention. The motor drive IC 101 includes a constant voltage power supply circuit 102, a LIN input / output circuit 103, a clock generation circuit 104, a logic circuit 105 that performs LIN communication and motor control, and an H-type bridge circuit 106. VCC is a power input terminal of 12 volts, VREG is a constant voltage power output terminal of 5 volts, VDD is a logic power input terminal of the clock generation circuit 104 and logic circuit 105 formed by a C-MOS process, and GND is a ground terminal. It is. BUS is a LIN input / output terminal, and MT1 and MT2 are connection terminals of the motor M. C1 is a first bypass capacitor connected between the power input terminal VCC and the ground terminal GND, C2 is a second bypass capacitor connected between the constant voltage power output terminal REG and the ground terminal GND, and C3 is This is a third bypass capacitor connected between the power supply input terminal VCC and the constant voltage power supply output terminal REG. By connecting the constant voltage power supply output terminal VREG and the logic power supply input terminal VDD, a constant voltage power supply of, for example, 5 volts is supplied to the clock generation circuit 104 and the logic circuit 105.

電源入力端子ＶＣＣと定電圧電源出力端子ＲＥＧとの間に第３のバイパスコンデンサＣ３を接続することで、定電圧電源出力の発振が軽減され、モータドライブ回路から発生するノイズが低減される。   By connecting the third bypass capacitor C3 between the power input terminal VCC and the constant voltage power output terminal REG, oscillation of the constant voltage power output is reduced and noise generated from the motor drive circuit is reduced.

図２に本発明に係るモータドライブ回路が発生するノイズの電界強度の一例を示す。ノイズの電界強度は低減されており、車載ラジオ受信機が高感度であっても、ラジオノイズを低減することができる。   FIG. 2 shows an example of electric field strength of noise generated by the motor drive circuit according to the present invention. The electric field strength of noise is reduced, and even if the in-vehicle radio receiver has high sensitivity, radio noise can be reduced.

また、図３に本発明に係るモータドライブ回路が発生するノイズ電流の一例を示す。図３（ａ）に示すように、ＬＩＮ入出力端子ＢＵＳの電圧レベルがしきい値以下になると定電圧電源回路１０２が動作状態になり、図３（ｂ）に示すように、定電圧電源出力端子ＶＲＥＧから定電圧電源出力が出力される。図３（ｃ）に示すように、この電源立上りの際に、電源入力端子ＶＣＣからモータドライブＩＣ１０１に供給される電流（ＶＳＵＰ電流）の変化は、図６（ｃ）と比較して大幅に小さくなっており、ラジオノイズを低減することができる。   FIG. 3 shows an example of noise current generated by the motor drive circuit according to the present invention. As shown in FIG. 3A, when the voltage level of the LIN input / output terminal BUS becomes equal to or lower than the threshold value, the constant voltage power supply circuit 102 enters an operating state, and as shown in FIG. A constant voltage power supply output is output from the terminal VREG. As shown in FIG. 3 (c), the change in the current (VSUP current) supplied from the power input terminal VCC to the motor drive IC 101 during the power-on is significantly smaller than that in FIG. 6 (c). Therefore, radio noise can be reduced.

本発明によれば、定電圧電源出力の発振が低減され、モータドライブ回路から発生するノイズが低減されるという効果を有し、車載のモータドライブ回路に有用である。   According to the present invention, the oscillation of the constant voltage power supply output is reduced and the noise generated from the motor drive circuit is reduced, which is useful for an in-vehicle motor drive circuit.

本発明に係るモータドライブ回路の構成を示す図である。It is a figure which shows the structure of the motor drive circuit which concerns on this invention. 本発明に係るモータドライブ回路が発生するノイズの電界強度の一例を示す図である。It is a figure which shows an example of the electric field strength of the noise which the motor drive circuit which concerns on this invention generate | occur | produces. 本発明に係るモータドライブ回路が発生するノイズ電流の一例を示す図である。It is a figure which shows an example of the noise current which the motor drive circuit which concerns on this invention generate | occur | produces. 従来のモータドライブ回路の構成を示す図である。It is a figure which shows the structure of the conventional motor drive circuit. 従来のモータドライブ回路が発生するノイズの電界強度の一例を示す図である。It is a figure which shows an example of the electric field strength of the noise which the conventional motor drive circuit generate | occur | produces. 従来のモータドライブ回路が発生するノイズ電流の一例を示す図である。It is a figure which shows an example of the noise electric current which the conventional motor drive circuit generate | occur | produces.

符号の説明Explanation of symbols

１０１ モータドライブＩＣ
１０２ 定電圧電源回路
１０４ クロック発生回路
１０５ ロジック回路
１０６ Ｈ型ブリッジ回路
ＶＣＣ 電源入力端子
ＶＲＥＧ 定電圧電源出力端子
ＶＤＤ ロジック電源入力端子
ＧＮＤ グランド端子
ＭＴ１，ＭＴ２ モータ接続端子
Ｃ１，Ｃ２，Ｃ３ バイパスコンデンサ
Ｍ モータ 101 Motor drive IC
102 constant voltage power supply circuit 104 clock generation circuit 105 logic circuit 106 H-type bridge circuit VCC power supply input terminal VREG constant voltage power supply output terminal VDD logic power supply input terminal GND ground terminal MT1, MT2 motor connection terminal C1, C2, C3 bypass capacitor M motor

Claims (1)

定電圧電源回路を内蔵したモータドライバＩＣにおいて、前記モータドライバＩＣの電源入力端子とグランド端子との間に第１のバイパスコンデンサを接続し、前記定電圧電源回路の定電圧出力端子と前記グランド端子との間に第２のバイパスコンデンサを接続し、前記モータドライバＩＣの電源入力端子と前記定電圧電源回路の定電圧出力端子との間に第３のバイパスコンデンサを接続したことを特徴とするモータドライバＩＣのノイズ低減回路。   In a motor driver IC having a built-in constant voltage power supply circuit, a first bypass capacitor is connected between a power input terminal of the motor driver IC and a ground terminal, and the constant voltage output terminal and the ground terminal of the constant voltage power supply circuit are connected. A second bypass capacitor is connected between the motor driver IC and a third bypass capacitor is connected between the power input terminal of the motor driver IC and the constant voltage output terminal of the constant voltage power circuit. Noise reduction circuit for driver IC.
JP2005045972A 2005-02-22 2005-02-22 Noise reduction circuit of motor driver ic Pending JP2006238529A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008259340A (en) * 2007-04-05 2008-10-23 Sanyo Electric Co Ltd Motor drive circuit

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001001555A1 (en) * 1999-06-29 2001-01-04 Mitsubishi Denki Kabushiki Kaisha Power conversion device
JP2003026024A (en) * 2001-07-17 2003-01-29 Omron Corp Control device for electric power steering
JP2004053528A (en) * 2002-07-23 2004-02-19 Mitsubishi Electric Corp Current detecting circuit

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001001555A1 (en) * 1999-06-29 2001-01-04 Mitsubishi Denki Kabushiki Kaisha Power conversion device
JP2003026024A (en) * 2001-07-17 2003-01-29 Omron Corp Control device for electric power steering
JP2004053528A (en) * 2002-07-23 2004-02-19 Mitsubishi Electric Corp Current detecting circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008259340A (en) * 2007-04-05 2008-10-23 Sanyo Electric Co Ltd Motor drive circuit

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