JP2003049755A - Drive circuit for car and ignition device for internal combustion engine using it - Google Patents

Drive circuit for car and ignition device for internal combustion engine using it

Info

Publication number
JP2003049755A
JP2003049755A JP2001234747A JP2001234747A JP2003049755A JP 2003049755 A JP2003049755 A JP 2003049755A JP 2001234747 A JP2001234747 A JP 2001234747A JP 2001234747 A JP2001234747 A JP 2001234747A JP 2003049755 A JP2003049755 A JP 2003049755A
Authority
JP
Japan
Prior art keywords
current
drive circuit
impedance
igbt
circuit
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.)
Granted
Application number
JP2001234747A
Other languages
Japanese (ja)
Other versions
JP3762264B2 (en
Inventor
Takashi Ito
太加志 伊藤
Katsuaki Fukatsu
克明 深津
Ryoichi Kobayashi
良一 小林
Noboru Sugiura
登 杉浦
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Ltd
Hitachi Automotive Systems Engineering Co Ltd
Original Assignee
Hitachi Ltd
Hitachi Car Engineering Co Ltd
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Filing date
Publication date
Application filed by Hitachi Ltd, Hitachi Car Engineering Co Ltd filed Critical Hitachi Ltd
Priority to JP2001234747A priority Critical patent/JP3762264B2/en
Publication of JP2003049755A publication Critical patent/JP2003049755A/en
Application granted granted Critical
Publication of JP3762264B2 publication Critical patent/JP3762264B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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  • Electronic Switches (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)

Abstract

PROBLEM TO BE SOLVED: To increase an input current and sufficiently assure the input current necessary for the ON-operation of an IGBT in a drive circuit (such as the drive circuit of an ignition device for internal combustion engine) for a car using a power element with IGBT. SOLUTION: This drive circuit 20 comprises the IGBT 21 as the power element allowing a primary current to flow through and cut off the coil of an ignition coil. A pull-down impedance (variable impedance circuit 32) allowing the input current to intentionally flow to the GND after bypassing the IGBT is installed on the input stage of the drive circuit 20. The pull-down impedance becomes a high impedance before the IGBT 21 is completely turned on and becomes a low impedance in an area where the IGBT 21 is completely turned on.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【発明の属する技術分野】本発明は、自動車用の電気機
器に用いる駆動回路及び該駆動回路を利用した内燃機関
用点火装置に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drive circuit used for electric equipment for automobiles and an ignition device for an internal combustion engine using the drive circuit.

【0002】[0002]

【従来の技術】例えば、内燃機関の点火装置では、エン
ジンコントロールユニット(内燃機関用電子制御装置、
以下、「ECU」と称する)からの点火制御信号によ
り、点火駆動回路のパワースイッチング素子をオン,オ
フさせて、点火コイルの一次電流を通電,遮断制御して
いる。
2. Description of the Related Art For example, in an ignition device for an internal combustion engine, an engine control unit (electronic control device for internal combustion engine,
Hereinafter, the power switching element of the ignition drive circuit is turned on / off by an ignition control signal from (hereinafter, referred to as "ECU") to control energization / interruption of the primary current of the ignition coil.

【0003】パワースイッチング素子としては、従来は
バイポーラトランジスタが使用されていたが、最近で
は、消費電流の少ないIGBT(絶縁ゲート型バイポー
ラトランジスタ)が使用されている。
Conventionally, a bipolar transistor has been used as a power switching element, but recently, an IGBT (insulated gate bipolar transistor) which consumes less current has been used.

【0004】IGBTは、絶縁ゲートを有する電圧駆動
タイプのスイッチング素子であることからECUからの
点火制御信号に対し電流をほとんど必要としない。ま
た、電流制限回路を有する場合においても、電流制限が
かからない場合はほとんど電流を必要としないため、E
CUと点火装置間の接続端子部にはμAオーダーの微少
な電流しか流れない。
Since the IGBT is a voltage-driven type switching element having an insulated gate, it requires almost no current for the ignition control signal from the ECU. Further, even when the current limiting circuit is provided, if the current is not limited, almost no current is required.
Only a small current of the order of μA flows through the connection terminal between the CU and the ignition device.

【0005】接続端子は通常Snめっきを使用するが、
端子間の接触電流が小さい場合、端子の酸化などが起こ
り接触不良が発生する場合がある。また、通常のECU
は、その出力部においてECUと点火装置間の断線検出
を行っているが、IGBTの場合には、ECUからの出
力電流が微少電流であるために断線検知が困難となる。
Normally, Sn plating is used for the connection terminals,
When the contact current between the terminals is small, the terminals may be oxidized and contact failure may occur. Also, a normal ECU
Detects the disconnection between the ECU and the ignition device at its output part, but in the case of the IGBT, it is difficult to detect the disconnection because the output current from the ECU is a minute current.

【0006】上記のような端子間の接触不良の問題や断
線検知の困難性を解決するために、従来は、例えば、特
開平9−228937号公報に開示されるように、IG
BTを用いた点火装置において、入力端子とGND間に
電流調整用のブリーダ抵抗(プルダウン抵抗)を設定
し、故意的に端子接続部に1mA以上の電流を流す技術
が提案されている。この端子接続部を通る電流は、ブリ
ーダ抵抗を介してIGBTのゲートをバイパスしGND
に流され、電圧駆動型のIGBTの動作に支障がないよ
うにしてある。ここでは、このブリーダ抵抗(プルダウ
ンインピーダンス)を流れる電流と、端子接続部電流,
プルダウン電流、或いは入力電流と称することもある。
In order to solve the problems of poor contact between terminals and the difficulty of detecting disconnection as described above, the conventional IG method is disclosed in, for example, Japanese Unexamined Patent Publication No. 9-228937.
In an ignition device using a BT, a technique has been proposed in which a bleeder resistance (pull-down resistance) for current adjustment is set between an input terminal and GND, and a current of 1 mA or more is intentionally applied to a terminal connection portion. The current flowing through this terminal connection bypasses the IGBT gate via the bleeder resistance and
Therefore, the operation of the voltage drive type IGBT is not hindered. Here, the current flowing through this bleeder resistance (pull-down impedance), the terminal connection current,
It may be referred to as pull-down current or input current.

【0007】ブリーダ抵抗を設けた場合、上記入力電流
(端子接続部電流,プルダウン電流)は電圧に対する抵
抗の比例電流になっている。
When a bleeder resistor is provided, the input current (terminal connection part current, pull-down current) is a current proportional to the resistance with respect to the voltage.

【0008】[0008]

【発明が解決しようとする課題】ところで、IGBTを
用いた点火装置であっても、事情によっては、上記入力
電流(端子接続部電流,プルダウン電流)を10mA〜
20mA以上要求されることもある。この場合には、駆
動回路のブリーダ抵抗(プルダウンインピーダンス)を
小さくせざるを得ない。
Even in the ignition device using the IGBT, depending on the circumstances, the input current (terminal connection current, pull-down current) is 10 mA to 10 mA.
20 mA or more may be required. In this case, there is no choice but to reduce the bleeder resistance (pull-down impedance) of the drive circuit.

【0009】しかし、点火装置として得られる入力電圧
は、ECUの出力抵抗とブリーダ抵抗の分圧になり、大
きな入力電流を得ようとしてブリーダ抵抗を小さくする
と、ブリーダ抵抗の電圧ドロップが小さくなり、点火装
置の入力電圧が低下してしまう。
However, the input voltage obtained as the ignition device becomes a partial pressure of the output resistance of the ECU and the bleeder resistance, and if the bleeder resistance is reduced in order to obtain a large input current, the voltage drop of the bleeder resistance is reduced, and the ignition is performed. The input voltage of the device will drop.

【0010】このような入力電圧の低下は、IGBT
(MOSゲートパワースイッチング素子)が電圧駆動形
の素子であるため、オン動作に必要な入力電圧を充分に
確保できないことになる。
Such a decrease in the input voltage is caused by the IGBT.
Since the (MOS gate power switching element) is a voltage-driven element, it is impossible to secure a sufficient input voltage required for the ON operation.

【0011】本発明は以上の課題を解決して、IGBT
使用のパワー素子を使用する自動車用駆動回路(内燃機
関用点火装置の駆動回路など)において、入力電流(端
子接続部電流,プルダウン電流)を大きくしたい場合に
その要求に応えると共に、IGBTのオン動作に必要な
入力電圧を充分に確保することができる手段を提供する
ことにある。
The present invention solves the above problems and realizes an IGBT
In an automobile drive circuit (drive circuit of an internal combustion engine ignition device, etc.) that uses a power element used, when it is desired to increase the input current (terminal connection part current, pull-down current), the demand can be met and the IGBT ON operation can be performed. It is to provide a means capable of sufficiently securing the input voltage necessary for

【0012】[0012]

【課題を解決するための手段】上記課題は、自動車の電
子制御装置から出力される制御信号に応じて電気機器の
電流を制御し、パワー素子としてIGBTを備える自動
車用駆動回路において、この駆動回路の入力段に流れる
電流を意図的にIGBTのゲートをバイパスしてグラウ
ンドに流すプルダウンインピーダンスを設け、プルダウ
ンインピーダンスは制御信号の電圧によって変化する可
変インピーダンス回路により構成することで達成され
る。
SUMMARY OF THE INVENTION The above object is to provide a drive circuit for an automobile, which controls an electric current of an electric device according to a control signal output from an electronic control unit of the automobile and includes an IGBT as a power element. The pull-down impedance is provided by intentionally bypassing the gate of the IGBT and flowing to the ground by flowing the current flowing in the input stage of the pull-down impedance. The pull-down impedance is achieved by a variable impedance circuit that changes according to the voltage of the control signal.

【0013】具体的には、例えば内燃機関用点火装置の
駆動回路において上記可変インピーダンス回路を備え、
この可変インピーダンス回路(プルダウンインピーダン
ス)は、IGBT(パワースイッチング素子)が完全に
オンするまでは、入力電流(プルダウン電流,端子接触
部電流)が少なく且つIGBT動作に必要なゲート電圧
を確保できるよう高インピーダンスとなり、IGBTが
完全にオンする領域では、入力電流が多くなるよう低イ
ンピーダンスとなる。
Specifically, for example, in the drive circuit of the ignition device for an internal combustion engine, the variable impedance circuit is provided,
This variable impedance circuit (pull-down impedance) has a high input current (pull-down current, terminal contact portion current) until the IGBT (power switching element) is completely turned on, and is high enough to secure the gate voltage required for the IGBT operation. In the region where the impedance is turned on and the IGBT is completely turned on, the impedance becomes low so that the input current increases.

【0014】[0014]

【発明の実施の形態】本発明の実施例を図面に基づき説
明する。
Embodiments of the present invention will be described with reference to the drawings.

【0015】図1は本発明の一実施例に係る回路図、図
2は本実施例に用いる駆動回路の入力電流と入力電圧と
の関係を示す特性図である。本実施例では、内燃機関用
の点火システムの構成例を示す。
FIG. 1 is a circuit diagram according to one embodiment of the present invention, and FIG. 2 is a characteristic diagram showing a relationship between an input current and an input voltage of a drive circuit used in this embodiment. In the present embodiment, a configuration example of an ignition system for an internal combustion engine will be shown.

【0016】1はECU、2は点火装置である。Reference numeral 1 is an ECU, and 2 is an ignition device.

【0017】ECU1は、自動車の運転状態に応じて点
火時期などを演算する演算装置(CPU)8を有し、そ
の出力段にNPNトランジスタ10とプルアップ抵抗9
が設けてある。CPU8により算出された適正な点火タ
イミングで、トランジスタ10をオン,オフ制御し、点
火装置2にハイレベル,ローレベルのパルスを出力す
る。
The ECU 1 has a computing unit (CPU) 8 for computing ignition timing and the like in accordance with the operating state of the vehicle, and has an NPN transistor 10 and a pull-up resistor 9 at its output stage.
Is provided. At a proper ignition timing calculated by the CPU 8, the transistor 10 is controlled to be turned on and off, and high-level and low-level pulses are output to the ignition device 2.

【0018】点火装置2は、その駆動回路20と点火コ
イル3及び点火プラグ4により構成される。
The ignition device 2 comprises a drive circuit 20, an ignition coil 3 and an ignition plug 4.

【0019】駆動回路20は、点火コイル3の一次電流
を通電・遮断するパワースイッチング素子としてIGB
T21を有する。
The drive circuit 20 is an IGBT as a power switching element for energizing and interrupting the primary current of the ignition coil 3.
It has T21.

【0020】IGBT21のゲートは、ゲート抵抗30
および入力端子29を介してEPU1の出力端子と接続
され、コレクタが点火コイル3の一次コイルと接続さ
れ、エミッタがGNDに接続される。
The gate of the IGBT 21 has a gate resistance 30.
And the output terminal of the EPU 1 via the input terminal 29, the collector is connected to the primary coil of the ignition coil 3, and the emitter is connected to the GND.

【0021】駆動回路20は、一次コイルの電流(一次
電流)が過多にならないようにするための保護回路を有
する。この保護回路は、サブIGBT28,電流検出抵
抗27,電流制限回路部26により構成される。
The drive circuit 20 has a protection circuit for preventing the current (primary current) of the primary coil from becoming excessive. This protection circuit includes a sub-IGBT 28, a current detection resistor 27, and a current limiting circuit unit 26.

【0022】サブIGBT28は、IGBT21と並列
に接続されてIGBT21同様に点火制御信号によりオ
ン,オフ制御され、オン動作時に点火コイルの一次電流
の一部を電流検出抵抗27に通すようにしてある。電流
検出抵抗27は、サブIGBT28のエミッタとGND
との間に接続される。
The sub-IGBT 28 is connected in parallel with the IGBT 21 and is turned on / off by an ignition control signal similarly to the IGBT 21, and a part of the primary current of the ignition coil is passed through the current detection resistor 27 during the on-operation. The current detection resistor 27 is connected to the emitter of the sub-IGBT 28 and the GND.
Connected between and.

【0023】電流制限回路部26は、抵抗27の検出信
号を入力し、一次電流が所定値以上にならないようにI
GBT21を制御することで、IGBT21を保護す
る。
The current limiting circuit section 26 receives the detection signal of the resistor 27 and controls the primary current so that it does not exceed a predetermined value.
The IGBT 21 is protected by controlling the GBT 21.

【0024】駆動回路20の入力段には、意図的に入力
電流をIGBT21のゲートをバイパスしてGNDに流
すプルダウンインピーダンスを設ける。このプルダウン
インピーダンスは、抵抗22,23(R1,R2)、抵
抗25(R3),スイッチング素子(例えばMOSトラ
ンジスタ)24よりなる可変インピーダンス回路32に
より構成される。
At the input stage of the drive circuit 20, a pull-down impedance is intentionally provided to allow the input current to bypass the gate of the IGBT 21 and flow to GND. This pull-down impedance is composed of a variable impedance circuit 32 including resistors 22, 23 (R1, R2), a resistor 25 (R3), and a switching element (eg, MOS transistor) 24.

【0025】この可変インピーダンス回路32は、IG
BT21のゲートに入力される制御信号の電圧によって
プルダウンインピーダンスを変化させるものである。具
体的には、例えば、分圧抵抗22(R1),23(R
2)は駆動回路20の入力端子29とGND間に接続さ
れ、また、抵抗25(R3)とスイッチング素子24も
直列にして入力端子29とGND間に接続されている。
スイッチング素子24のゲートは、分圧抵抗22,23
間に接続されている。スイッチング素子24のソース
は、GND電位となるIGBT21のエミツタ側に接続
され、ドレインは抵抗25を介して入力端子29に接続
される。
The variable impedance circuit 32 is an IG
The pull-down impedance is changed by the voltage of the control signal input to the gate of BT21. Specifically, for example, the voltage dividing resistors 22 (R1) and 23 (R
2) is connected between the input terminal 29 of the drive circuit 20 and GND, and the resistor 25 (R3) and the switching element 24 are also connected in series and connected between the input terminal 29 and GND.
The gate of the switching element 24 has voltage dividing resistors 22 and 23.
Is connected in between. The source of the switching element 24 is connected to the emitter side of the IGBT 21, which is at the GND potential, and the drain is connected to the input terminal 29 via the resistor 25.

【0026】この分圧抵抗22(R1),23(R2)
間の電圧が所定値以上になると、スイッチング素子24
がオンして、抵抗25(R3)が抵抗22,23(R
1,R2)と並列の接続状態になる。
The voltage dividing resistors 22 (R1) and 23 (R2)
When the voltage between them exceeds a predetermined value, the switching element 24
Is turned on, and the resistor 25 (R3) turns on the resistors 22 and 23 (R
1, R2) is connected in parallel.

【0027】本実施例によれば、IGBT21は、EC
U1の出力信号がローからハイレベル信号になることで
オンし点火コイル3の一次電流を通電させる。IGBT
21をオフからオンに変える場合の入力電圧(ゲート電
圧)は、ECU1の出力電圧をプルアップ抵抗9と抵抗
22,23で分圧して得られるものである。すなわち、
ECU1がローからハイレベルに変わる時点(換言すれ
ばIGBT21が完全にオンするまでの時点)では、可
変インピーダンス回路32のスイッチング素子24がオ
ンする直前であるので、抵抗素子25は、まだ分圧抵抗
22,23と並列接続の状態にはなっていない。この場
合には、可変抵抗回路32は高インピーダンス状態(高
プルダウンインピーダンス)であり、IGBT21のゲ
ート電圧を充分に確保することができる。また、駆動回
路20の入力電流(プルダウン電流,端子接続部電流)
の流し込み量が少なくなる。
According to this embodiment, the IGBT 21 is an EC
When the output signal of U1 changes from low to high level signal, it is turned on and the primary current of the ignition coil 3 is passed. IGBT
The input voltage (gate voltage) when changing 21 from off to on is obtained by dividing the output voltage of the ECU 1 by the pull-up resistor 9 and the resistors 22 and 23. That is,
At the time when the ECU 1 changes from the low level to the high level (in other words, the time when the IGBT 21 is completely turned on), it is immediately before the switching element 24 of the variable impedance circuit 32 is turned on, and therefore the resistance element 25 is still a voltage dividing resistor. It is not in parallel with 22 and 23. In this case, the variable resistance circuit 32 is in a high impedance state (high pull-down impedance), and the gate voltage of the IGBT 21 can be sufficiently secured. Also, the input current of the drive circuit 20 (pull-down current, terminal connection current)
The pouring amount of is reduced.

【0028】上記高インピーダンス領域の入力電流,入
力電圧は次式で表せる。
The input current and input voltage in the high impedance region can be expressed by the following equations.

【0029】[数1] 入力電流=入力電圧/(R22+R23) ECU1の出力信号がハイレベルとなった後(IGBT
21がオンした後)は、分圧抵抗22,23間の電圧値
がスイッチング素子24をオンさせるに充分なゲート電
圧となり、スイッチング素子24がオンする。これによ
って、抵抗素子25も通電し、抵抗25が抵抗22,2
3と並列接続状態になる。
[Equation 1] Input current = Input voltage / (R22 + R23) After the output signal of the ECU 1 becomes high level (IGBT
21 is turned on), the voltage value between the voltage dividing resistors 22 and 23 becomes a gate voltage sufficient to turn on the switching element 24, and the switching element 24 is turned on. As a result, the resistance element 25 is also energized, and the resistance 25 becomes
3 is connected in parallel.

【0030】この場合には、ECU1の出力(ハイレベ
ル)がプルアップ抵抗9と上記した並列抵抗との分圧値
となるが、IGBT21のオン状態を維持するゲート電
圧は確保される。また、上記分圧抵抗22,23と抵抗
25との並列抵抗回路が形成されることで、可変インピ
ーダンス回路23は低インピーダンス(低プルダウンイ
ンピーダンス)となる。
In this case, the output (high level) of the ECU 1 becomes a voltage division value between the pull-up resistor 9 and the parallel resistor described above, but the gate voltage for maintaining the ON state of the IGBT 21 is secured. Further, the variable impedance circuit 23 has a low impedance (low pull-down impedance) by forming a parallel resistance circuit of the voltage dividing resistors 22 and 23 and the resistor 25.

【0031】上記低インピーダンス領域の入力電流,入
力電圧は次式で表せる。
The input current and input voltage in the low impedance region can be expressed by the following equations.

【0032】[数2] 入力電流=入力電圧/〔(R1+R2+R3)/(R1
+R2)R3〕 したがって、駆動回路20の入力電流の流し込み量が多
くなる。
[Equation 2] Input current = input voltage / [(R1 + R2 + R3) / (R1
+ R2) R3] Therefore, the amount of input current of the drive circuit 20 increases.

【0033】図2に上記数1,2式による点火装置の入
力電圧に対する入力電流の関係を示す。
FIG. 2 shows the relationship between the input voltage and the input current of the ignition device according to the equations (1) and (2).

【0034】次に、ECU1の出力信号がハイからロー
レベルに変わることで、IGBT21はオフし、一次電
流が遮断され、IGBT21のコレクタ部に電圧が発生
し、点火コイル3の二次側に点火コイルの巻き数比倍に
相当する高電圧が誘起される。この場合には、スイッチ
ング素子24もオフする。
Next, when the output signal of the ECU 1 changes from high to low level, the IGBT 21 is turned off, the primary current is cut off, a voltage is generated in the collector portion of the IGBT 21, and the secondary side of the ignition coil 3 is ignited. A high voltage equivalent to the number of turns of the coil is induced. In this case, the switching element 24 is also turned off.

【0035】本実施例によれば、駆動回路20のプルダ
ウンインピーダンスに上記したような可変インピーダン
ス回路32を設けることで、駆動回路の高インピーダン
ス時の入力電流,入力電圧と低インピーダンス時の入力
電流,入力電圧を任意に設定することができる。
According to the present embodiment, by providing the variable impedance circuit 32 as described above in the pull-down impedance of the drive circuit 20, the input current when the drive circuit has a high impedance, the input voltage and the input current when the drive circuit has a low impedance, The input voltage can be set arbitrarily.

【0036】それにより、ECU1・点火装置2間の端
子接触部の酸化を防止する端子接触部電流及び断線検知
の自己診断(自己診断回路については図示省略してあ
る)機能を確保できるほかに、さらに必要に応じて所望
の入力電流を得ることができ、また、このような大きな
入力電流を確保しても、IGBT(点火装置)の動作に
必要なゲート電圧を充分に確保することができる。可変
インピーダンス回路32は、例えば、高インピーダンス
時の入力流し込み電流を4mA以下とし、低インピーダ
ンス時の入力流し込み電流を8mA以上確保するように
設定されている。
As a result, a self-diagnosis function (a self-diagnosis circuit is not shown) for detecting the current at the terminal contact portion and for detecting the disconnection for preventing the oxidation of the terminal contact portion between the ECU 1 and the ignition device 2 can be secured. Further, a desired input current can be obtained as necessary, and even if such a large input current is secured, a gate voltage required for the operation of the IGBT (ignition device) can be sufficiently secured. The variable impedance circuit 32 is set so that, for example, the input flow current at the time of high impedance is 4 mA or less and the input flow current at the time of low impedance is 8 mA or more.

【0037】上記実施例では、点火装置の駆動回路20
は、IGBT21のモノリシックシリコン基板上に、電
流制限回路部26及び可変インピーダンス回路32を集
約した1チップ型で構成されている。
In the above embodiment, the drive circuit 20 for the ignition device is used.
Is a one-chip type in which the current limiting circuit unit 26 and the variable impedance circuit 32 are integrated on a monolithic silicon substrate of the IGBT 21.

【0038】サブIGBT28は、メインのIGBT2
1に対してある比をもって小さい面積に形成されてい
る。
The sub-IGBT 28 is the main IGBT 2
It is formed in a small area with a certain ratio with respect to 1.

【0039】この回路20を用いることによって、IG
BT(パワースイッチング素子)を用いた点火装置のゲ
ート電圧を確保しながら入力電流を大きくとることが可
能となり、動作の安定した信頼性の高い多機能な1チッ
プイグナイタを実現させることができる。
By using this circuit 20, the IG
It is possible to obtain a large input current while securing the gate voltage of the ignition device using a BT (power switching element), and it is possible to realize a highly reliable and multifunctional one-chip igniter with stable operation.

【0040】図4は、本発明と比較する点火装置の比較
例であり、比較例は本発明のようにプルダウンインピー
ダンスを可変インピーダンス回路で構成しておらず、固
定のプルダウン抵抗(ブリーダ抵抗)を設けたものであ
る。図中、図1と同一符号は、同一或いは共通する要素
を示す。
FIG. 4 is a comparative example of an ignition device to be compared with the present invention. In the comparative example, unlike the present invention, the pull-down impedance is not composed of a variable impedance circuit, but a fixed pull-down resistor (bleeder resistance) is used. It is provided. In the figure, the same reference numerals as those in FIG. 1 indicate the same or common elements.

【0041】この場合には、IGBT21のゲートとG
NDの間にプルダウン抵抗40を設けて、入力電流を意
図的にGNDに流す回路であり、入力電流は入力電圧/
入力抵抗で定義されるリニア特性となる。
In this case, the gate of the IGBT 21 and the G
This is a circuit in which a pull-down resistor 40 is provided between ND and an input current intentionally flows to GND.
It has a linear characteristic defined by the input resistance.

【0042】比較例の場合には、入力電流を例えば4m
A以上確保しようとしてプルダウン抵抗を小さくする
と、抵抗40の電圧ドロップが小さすぎて、IGBT2
1のゲート電圧が充分確保できず、逆にゲート電圧を確
保しようとしてプルダウン抵抗40を大きくすると、所
望の入力電流を充分に確保できない。
In the case of the comparative example, the input current is, for example, 4 m.
If the pull-down resistance is reduced in order to secure A or more, the voltage drop of the resistor 40 is too small and the IGBT2
However, if the pull-down resistor 40 is made large in order to secure the gate voltage, the desired input current cannot be secured sufficiently.

【0043】図3は、本発明の他の実施例に係る点火装
置の回路図である。
FIG. 3 is a circuit diagram of an ignition device according to another embodiment of the present invention.

【0044】本実施例と図1の実施例とは基本的には、
同様の回路構成をなすものであるが、相違する点は、駆
動回路20に、入力される点火制御信号に対する動作電
圧レベルにしきい値及びヒステリシスを持たせる入力制
御回路33を設けた点である。
Basically, this embodiment and the embodiment of FIG.
Although having the same circuit configuration, the different point is that the drive circuit 20 is provided with an input control circuit 33 for giving a threshold value and hysteresis to the operating voltage level with respect to the input ignition control signal.

【0045】本実施例では、電流制限回路31と入力制
御回路33をIGBT基板に集約している。入力制御回
路33は、駆動回路20の入力信号(ゲート電圧)が第
一の設定値以上になると、IGBT21のゲートに電圧
を印加するスレツシュホールドレベルを制御し、ゲート
に電圧を印加した後、入力電圧が第二の設定値以下にな
るとIGBTのゲートの電圧を遮断するヒステリシスを
有している。
In this embodiment, the current limiting circuit 31 and the input control circuit 33 are integrated on the IGBT substrate. When the input signal (gate voltage) of the drive circuit 20 becomes equal to or higher than the first set value, the input control circuit 33 controls the threshold level for applying a voltage to the gate of the IGBT 21, and after applying the voltage to the gate, It has a hysteresis that shuts off the voltage of the gate of the IGBT when the input voltage becomes equal to or lower than the second set value.

【0046】なお、本発明の駆動回路20は、点火装置
のほかに自動車用のその他のアクチュエータの駆動回路
としても適用することができる。
The drive circuit 20 of the present invention can be applied as a drive circuit for other actuators for automobiles in addition to the ignition device.

【0047】[0047]

【発明の効果】本発明によれば、IGBT(MOSゲー
トパワースイッチング素子)を用いた点火装置のゲート
電圧を充分に確保しながら入力電流を大きくとることが
可能となり、動作の安定した信頼性の高い多機能な自動
車用駆動回路および内燃機関用点火装置を得ることがで
きる。
According to the present invention, it becomes possible to obtain a large input current while sufficiently securing the gate voltage of an ignition device using an IGBT (MOS gate power switching element), which ensures stable operation and reliability. It is possible to obtain a highly multifunctional drive circuit for an automobile and an ignition device for an internal combustion engine.

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明の一実施例に係る回路構成図。FIG. 1 is a circuit configuration diagram according to an embodiment of the present invention.

【図2】上記実施例における点火装置の入力電流と入力
電圧との関係を示す特性図。
FIG. 2 is a characteristic diagram showing a relationship between an input current and an input voltage of the ignition device in the above embodiment.

【図3】本発明の他の実施例に係る回路構成図。FIG. 3 is a circuit configuration diagram according to another embodiment of the present invention.

【図4】本発明に対する比較例を示す説明図。FIG. 4 is an explanatory diagram showing a comparative example with respect to the present invention.

【符号の説明】[Explanation of symbols]

1…ECU、2…点火装置、3…点火コイル、20…駆
動回路、21…IGBT、32…可変インピーダンス回
路(プルダウンインピーダンス)。
1 ... ECU, 2 ... Ignition device, 3 ... Ignition coil, 20 ... Drive circuit, 21 ... IGBT, 32 ... Variable impedance circuit (pull-down impedance).

フロントページの続き (72)発明者 深津 克明 茨城県ひたちなか市高場2477番地 株式会 社日立カーエンジニアリング内 (72)発明者 小林 良一 茨城県ひたちなか市大字高場2520番地 株 式会社日立製作所自動車機器グループ内 (72)発明者 杉浦 登 茨城県ひたちなか市大字高場2520番地 株 式会社日立製作所自動車機器グループ内 Fターム(参考) 3G019 BA01 EB07 FA04 FA12 5J055 AX05 AX36 AX53 AX64 BX16 CX28 DX09 EZ39 EZ57 FX05 FX08 FX12 FX32 GX01 GX02 GX06 Continued front page    (72) Inventor Katsuaki Fukatsu             2477 Takaba, Hitachinaka City, Ibaraki Prefecture Stock Association             Inside Hitachi Car Engineering (72) Inventor Ryoichi Kobayashi             Hitachinaka City, Ibaraki Prefecture 2520 Takaba             Ceremony Company Hitachi Ltd. Automotive equipment group (72) Inventor Noboru Sugiura             Hitachinaka City, Ibaraki Prefecture 2520 Takaba             Ceremony Company Hitachi Ltd. Automotive equipment group F-term (reference) 3G019 BA01 EB07 FA04 FA12                 5J055 AX05 AX36 AX53 AX64 BX16                       CX28 DX09 EZ39 EZ57 FX05                       FX08 FX12 FX32 GX01 GX02                       GX06

Claims (6)

【特許請求の範囲】[Claims] 【請求項1】 自動車の電子制御装置から出力される制
御信号に応じて電気機器の電流を制御し、パワー素子と
して絶縁ゲート型バイポーラトランジスタ(以下、「I
GBT」と称する)を備える自動車用駆動回路におい
て、 この駆動回路の入力段に流れる電流を意図的に前記IG
BTのゲートをバイパスしてグラウンド(以下、「GN
D」と称する)に流すプルダウンインピーダンスを設
け、前記プルダウンインピーダンスは前記制御信号の電
圧によって変化する可変インピーダンス回路により構成
したことを特徴とする自動車用駆動回路。
1. An insulated gate bipolar transistor (hereinafter referred to as "I") is controlled as a power element by controlling a current of an electric device according to a control signal output from an electronic control unit of an automobile.
(Hereinafter referred to as "GBT"), the current flowing in the input stage of the drive circuit is intentionally changed by the IG.
Bypassing the gate of BT to ground (hereinafter "GN
A pull-down impedance flowing through the drive circuit is referred to as "D"), and the pull-down impedance is configured by a variable impedance circuit that changes according to the voltage of the control signal.
【請求項2】 内燃機関用の電子制御装置から出力され
る点火制御信号に応じて点火コイルに流れる一次電流を
通電,遮断する駆動回路を有し、この駆動回路は、一次
電流を通電,遮断するためのパワースイッチング素子と
してIGBTを有する内燃機関用点火装置において、 前記駆動回路の入力段に流れる電流を意図的に前記IG
BTのゲートをバイパスしてGNDに流すプルダウンイ
ンピーダンスを設け(以下、この電流を「プルダウン電
流」と称する)、このプルダウンインピーダンスは、前
記IGBTが完全にオンするまでは高インピーダンスと
なり、前記IGBTが完全にオンする領域では低インピ
ーダンスとなる可変インピーダンス回路により構成され
ていることを特徴とする内燃機関用点火装置。
2. A drive circuit for energizing and interrupting a primary current flowing through an ignition coil according to an ignition control signal output from an electronic control unit for an internal combustion engine, the drive circuit energizing and interrupting the primary current. In an ignition device for an internal combustion engine having an IGBT as a power switching element for controlling the current, the current flowing through the input stage of the drive circuit is intentionally changed by the IG.
A pull-down impedance that bypasses the gate of BT and flows to GND is provided (hereinafter, this current is referred to as “pull-down current”). This pull-down impedance becomes high impedance until the IGBT is completely turned on, and the IGBT is completely An ignition device for an internal combustion engine, comprising a variable impedance circuit having a low impedance in a region that is turned on.
【請求項3】 前記可変インピーダンス回路は、前記駆
動回路の入力端子とGND間に接続された分圧抵抗R
1,R2と、この分圧抵抗R1,R2間の電圧が所定値
以上になるとスイッチオンして分圧抵抗R1,R2と並
列の接続状態になる抵抗R3とで構成されている請求項
2記載の内燃機関用点火装置。
3. The variable impedance circuit includes a voltage dividing resistor R connected between an input terminal of the drive circuit and GND.
3. A resistor R3, which includes a resistor R1 and a resistor R2, and a resistor R3 which is switched on when the voltage between the resistor R1 and R2 is equal to or higher than a predetermined value to be connected in parallel with the resistor R1 and R2. Ignition device for internal combustion engine.
【請求項4】 前記駆動回路は、前記可変インピーダン
ス回路及び点火コイルの一次電流を制限する回路を含
み、かつ前記IGBTのモノリシックシリコン基板に集
積して形成されている1チップ型の回路である請求項2
又は3記載の内燃機関用点火装置。
4. The drive circuit is a one-chip type circuit that includes the variable impedance circuit and a circuit that limits a primary current of an ignition coil and that is integrated on a monolithic silicon substrate of the IGBT. Item 2
Or the ignition device for an internal combustion engine according to item 3.
【請求項5】 前記可変インピーダンス回路は、高イン
ピーダンス時に前記プルダウン電流が4mA以下とな
り、低インピーダンス時に前記プルダウン電流が8mA
以上確保できるように設定されている請求項2ないし4
のいずれか1項記載の内燃機関用点火装置。
5. The variable impedance circuit has a pull-down current of 4 mA or less when the impedance is high and a pull-down current of 8 mA when the impedance is low.
It is set so that the above can be secured.
An ignition device for an internal combustion engine according to claim 1.
【請求項6】 前記駆動回路は、入力される点火制御信
号に対する動作電圧レベルにしきい値及びヒステリシス
を持たせる入力制御回路を有する請求項2ないし5のい
ずれか1項記載の内燃機関用点火装置。
6. The ignition device for an internal combustion engine according to claim 2, wherein the drive circuit has an input control circuit that gives a threshold value and hysteresis to an operating voltage level with respect to an input ignition control signal. .
JP2001234747A 2001-08-02 2001-08-02 Driving circuit for automobile and ignition device for internal combustion engine using the same Expired - Lifetime JP3762264B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2001234747A JP3762264B2 (en) 2001-08-02 2001-08-02 Driving circuit for automobile and ignition device for internal combustion engine using the same

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2001234747A JP3762264B2 (en) 2001-08-02 2001-08-02 Driving circuit for automobile and ignition device for internal combustion engine using the same

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Publication Number Publication Date
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JP3762264B2 JP3762264B2 (en) 2006-04-05

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ID=19066298

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Application Number Title Priority Date Filing Date
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Country Status (1)

Country Link
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102220930A (en) * 2010-04-17 2011-10-19 博格华纳贝鲁***有限公司 Method for igniting a fuel/air mixture of a combustion chamber
WO2017073215A1 (en) * 2015-10-27 2017-05-04 ローム株式会社 Switch drive circuit, switch circuit, and power supply device
JP2020061820A (en) * 2018-10-05 2020-04-16 ローム株式会社 Drive device, insulation-type dc/dc converter, ac/dc converter, power supply adaptor, and electrical apparatus
WO2023181661A1 (en) * 2022-03-25 2023-09-28 ローム株式会社 Driver device, switching power source device, and electric equipment

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102220930A (en) * 2010-04-17 2011-10-19 博格华纳贝鲁***有限公司 Method for igniting a fuel/air mixture of a combustion chamber
WO2017073215A1 (en) * 2015-10-27 2017-05-04 ローム株式会社 Switch drive circuit, switch circuit, and power supply device
JP2017085318A (en) * 2015-10-27 2017-05-18 ローム株式会社 Switch drive circuit, switch circuit, and power supply device
US10826486B2 (en) 2015-10-27 2020-11-03 Rohm Co., Ltd. Switching driving circuit, switching circuit, and power supply device
JP2020061820A (en) * 2018-10-05 2020-04-16 ローム株式会社 Drive device, insulation-type dc/dc converter, ac/dc converter, power supply adaptor, and electrical apparatus
JP7189721B2 (en) 2018-10-05 2022-12-14 ローム株式会社 Drive devices, isolated DC/DC converters, AC/DC converters, power adapters and electrical equipment
WO2023181661A1 (en) * 2022-03-25 2023-09-28 ローム株式会社 Driver device, switching power source device, and electric equipment

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