JP2003319552A - Overcurrent protector of inverter circuit - Google Patents
Overcurrent protector of inverter circuitInfo
- Publication number
- JP2003319552A JP2003319552A JP2002121753A JP2002121753A JP2003319552A JP 2003319552 A JP2003319552 A JP 2003319552A JP 2002121753 A JP2002121753 A JP 2002121753A JP 2002121753 A JP2002121753 A JP 2002121753A JP 2003319552 A JP2003319552 A JP 2003319552A
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- Prior art keywords
- overcurrent
- resistor
- overcurrent protection
- voltage
- 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.)
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- Inverter Devices (AREA)
- Emergency Protection Circuit Devices (AREA)
- Protection Of Static Devices (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明はインバータ回路の過
電流保護装置に関し、特に過電流保護レベルを可変にす
るインバータ回路の過電流保護装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an overcurrent protection device for an inverter circuit, and more particularly to an overcurrent protection device for an inverter circuit that makes an overcurrent protection level variable.
【０００２】[0002]
【従来の技術】まず、図５を参照して、インバータ回路
装置およびその制御回路の動作を簡単に説明する。2. Description of the Related Art First, the operation of an inverter circuit device and its control circuit will be briefly described with reference to FIG.
【０００３】マイクロコンピュータあるいはＤＳＰによ
り構成された制御回路１には回転速度設定信号に応じた
周波数の基準信号が入力され、それぞれ１２０度の位相
差を有する３つのパルス幅変調された正弦波とこのパル
ス幅変調された正弦波に対して１８０度位相が遅れた３
つのパルスが生成されている。A reference signal having a frequency corresponding to a rotation speed setting signal is input to a control circuit 1 composed of a microcomputer or DSP, and three pulse width modulated sine waves each having a phase difference of 120 degrees and this 180 degrees behind the pulse width modulated sine wave 3
Two pulses are being generated.
【０００４】それぞれ１２０度の位相差を有する３つの
パルス幅変調された正弦波はドライバ回路２を介して、
インバータ回路を構成する上側アームのスイッチング素
子Ｑ１、Ｑ２、Ｑ３の制御電極に入力され、このスイッ
チング素子をオン・オフ制御する。Three pulse width modulated sine waves each having a phase difference of 120 degrees are passed through the driver circuit 2 and
It is input to the control electrodes of the switching elements Q1, Q2, Q3 of the upper arm that form the inverter circuit, and the switching elements are turned on / off.
【０００５】また、このパルス幅変調された正弦波に対
して１８０度位相が遅れたパルス幅変調された正弦波は
同様に下側アームのスイッチング素子Ｑ４、Ｑ５、Ｑ６
をオン・オフ制御する。The pulse-width-modulated sine wave whose phase is delayed by 180 degrees with respect to the pulse-width-modulated sine wave is likewise the switching elements Q4, Q5, Q6 of the lower arm.
ON / OFF control.
【０００６】なお、スイッチング素子Ｑ１、Ｑ２、Ｑ
３、Ｑ４、Ｑ５、Ｑ６に接続されたダイオードＤ１、Ｄ
２、Ｄ３、Ｄ４、Ｄ５、Ｄ６は回生ダイオードである。The switching elements Q1, Q2, Q
Diodes D1 and D connected to 3, Q4, Q5 and Q6
2, D3, D4, D5 and D6 are regenerative diodes.
【０００７】従って、それぞれ１２０度の位相差を有す
る３つのパルス幅変調された正弦波とこのパルス幅変調
された正弦波に対してそれぞれ１８０度位相が遅れた３
つのパルス幅変調された正弦波によりオン・オフ制御さ
れるインバータ回路の出力端子、すなわちスイッチング
素子Ｑ１とＱ４、スイッチング素子Ｑ２とＱ５、スイッ
チング素子Ｑ３とＱ６の接続点Ｕ、Ｖ、Ｗには３相のパ
ルス幅変調された正弦波電圧が得られ、モータＭに流れ
る負荷電流は正弦波に近似したものとなる。Therefore, three pulse-width modulated sine waves each having a phase difference of 120 degrees and three phases delayed by 180 degrees with respect to the pulse-width modulated sine waves, respectively.
3 at the connection points U, V and W of the output terminals of the inverter circuit that is on / off controlled by two pulse width modulated sine waves, namely, switching elements Q1 and Q4, switching elements Q2 and Q5, and switching elements Q3 and Q6. A pulse width modulated sine wave voltage of the phase is obtained, and the load current flowing through the motor M is approximate to a sine wave.
【０００８】モータの過負荷や直列スイッチング素子の
同時オンなどに起因する過電流は過電流検出抵抗Ｒｓお
よび過電流検出回路３により過電流検出信号として検出
され、制御回路１からこの過電流検出信号に基づいて一
定期間パルス出力を停止する等の保護動作を行う。An overcurrent caused by an overload of the motor or simultaneous turn-on of series switching elements is detected as an overcurrent detection signal by the overcurrent detection resistor Rs and the overcurrent detection circuit 3, and the overcurrent detection signal is output from the control circuit 1. Based on the above, protection operation such as stopping pulse output for a certain period is performed.
【０００９】この過電流検出抵抗Ｒｓは制御するモータ
の特性や容量により適切な抵抗値に選ばれ、例えば過電
流保護レベルは１０Ａ〜５０Ａ程度に設定される必要が
ある。この過電流検出抵抗Ｒｓを混成集積回路基板に組
み込む場合には過電流保護レベルを可変にするために外
付け抵抗として設計されなくてはならなかった。The overcurrent detection resistor Rs is selected to have an appropriate resistance value according to the characteristics and capacity of the motor to be controlled, and for example, the overcurrent protection level needs to be set to about 10A to 50A. When this overcurrent detection resistor Rs is incorporated in the hybrid integrated circuit board, it must be designed as an external resistor in order to make the overcurrent protection level variable.
【００１０】[0010]
【発明が解決しようとする課題】上述した過電流検出抵
抗Ｒｓは大電流が流れるので、出来るだけ混成集積回路
の中に組み込みたい要望があり、これを実現すると設定
する過電流保護レベルに応じて多数の混成集積回路を用
意する必要があり、過電流保護レベル毎に多品種を揃え
なくてはならない問題点を有していた。Since a large current flows through the above-described overcurrent detection resistor Rs, there is a desire to incorporate it into a hybrid integrated circuit as much as possible. If this is realized, it is necessary to set the overcurrent protection level. It is necessary to prepare a large number of hybrid integrated circuits, and there is a problem that a large variety of products must be prepared for each overcurrent protection level.
【００１１】また、スイッチング素子、過電流検出抵抗
Ｒｓ、ドライバ回路２は発熱を伴うので、金属基板等を
用いた混成集積回路にモジュール化して取り扱い易くす
る要望も強いために、過電流保護レベルを可変にできな
かった問題点もあった。Further, since the switching element, the overcurrent detection resistor Rs, and the driver circuit 2 generate heat, there is a strong demand for modularization into a hybrid integrated circuit using a metal substrate or the like for easy handling. There were some problems that could not be changed.
【００１２】更に、過電流検出抵抗Ｒｓで検出される検
出電圧は過電流検出抵抗Ｒｓの抵抗値が極めて小さいの
で、０．２Ｖ程度であり、過電流保護レベルの調整が極
めて困難である問題点も発生していた。Further, the detection voltage detected by the overcurrent detection resistor Rs is about 0.2 V because the resistance value of the overcurrent detection resistor Rs is extremely small, and it is extremely difficult to adjust the overcurrent protection level. Was also occurring.
【００１３】[0013]
【課題を解決するための手段】本発明はかかる問題点に
鑑みてなされ、過電流検出抵抗からの検出電圧を増幅器
で大きく増幅し、増幅した検出電圧を分圧抵抗で分圧し
て過電流検出回路で基準電圧と比較して過電流保護を行
い、分圧抵抗の一方に直列あるいは並列に接続される外
付け抵抗を設けて分圧比を変えて過電流保護レベルを調
整可能とするインバータ回路の過電流保護装置を実現す
るものである。SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and a detection voltage from an overcurrent detection resistor is greatly amplified by an amplifier, and the amplified detection voltage is divided by a voltage dividing resistor to detect an overcurrent. In the inverter circuit that performs overcurrent protection by comparing with the reference voltage in the circuit, and installs an external resistor connected in series or in parallel to one of the voltage dividing resistors to change the voltage dividing ratio and adjust the overcurrent protection level. It realizes an overcurrent protection device.
【００１４】また、本発明では分圧抵抗も単一の混成集
積回路基板に組み込み、外付け抵抗のみの追加で過電流
保護レベルを調整可能とするインバータ回路の過電流保
護装置を実現するものである。The present invention also realizes an overcurrent protection device for an inverter circuit in which a voltage dividing resistor is also incorporated in a single hybrid integrated circuit board and the overcurrent protection level can be adjusted by adding only an external resistor. is there.
【００１５】更に、本発明では外付け抵抗を分圧抵抗の
一方に直列に接続して、過電流検出回路に入力される分
圧電圧を大きくして過電流保護レベルを小さくするイン
バータ回路の過電流保護装置を実現するものである。Further, according to the present invention, an external resistor is connected in series with one of the voltage dividing resistors to increase the divided voltage input to the overcurrent detection circuit to reduce the overcurrent protection level. It realizes a current protection device.
【００１６】更に、本発明では外付け抵抗は分圧抵抗の
一方に並列に接続して、過電流検出回路に入力される分
圧電圧を小さくして過電流保護レベルを大きくするイン
バータ回路の過電流保護装置を実現するものである。Further, according to the present invention, the external resistor is connected in parallel with one of the voltage dividing resistors to reduce the divided voltage input to the overcurrent detection circuit and increase the overcurrent protection level. It realizes a current protection device.
【００１７】[0017]
【発明の実施の形態】図１に本発明のインバータ回路の
過電流保護装置のブロック図を示す。FIG. 1 is a block diagram of an inverter circuit overcurrent protection device according to the present invention.
【００１８】本発明のインバータ回路は、インバータ回
路を構成する上側アームのスイッチング素子Ｑ１、Ｑ
２、Ｑ３と、下側アームのスイッチング素子Ｑ４、Ｑ
５、Ｑ６と、各スイッチング素子の制御電極に入力さ
れ、このスイッチング素子をオン・オフ制御するドライ
バ回路２と、下側アームのスイッチング素子Ｑ４、Ｑ
５、Ｑ６に共通に直列に接続された過電流検出抵抗Ｒｓ
と、インバータ回路の出力端子、すなわちスイッチング
素子Ｑ１とＱ４、スイッチング素子Ｑ２とＱ５、スイッ
チング素子Ｑ３とＱ６の接続点Ｕ、Ｖ、Ｗに接続された
モータＭ等の負荷とで構成される。制御回路１からは前
述したようにパルス幅変調された正弦波がドライブ回路
２に出力され、インバータ回路の制御を行っている。The inverter circuit of the present invention comprises the switching elements Q1 and Q of the upper arm which constitute the inverter circuit.
2, Q3 and the lower arm switching elements Q4, Q
5, Q6, the driver circuit 2 which is inputted to the control electrodes of the respective switching elements and controls the switching elements on / off, and the switching elements Q4, Q of the lower arm.
5, overcurrent detection resistor Rs commonly connected in series to Q6
And the output terminals of the inverter circuit, that is, the switching elements Q1 and Q4, the switching elements Q2 and Q5, and the loads such as the motor M connected to the connection points U, V, and W of the switching elements Q3 and Q6. As described above, the control circuit 1 outputs the pulse width-modulated sine wave to the drive circuit 2 to control the inverter circuit.
【００１９】本発明の特徴は過電流検出抵抗Ｒｓからの
検出電圧を増幅器４で約１０倍程度に増幅し、その増幅
された検出電圧を分圧抵抗Ｒ３、Ｒ４とその一方の分圧
抵抗に直列あるいは並列に接続される外付け抵抗Ｒ５を
用いて分圧することにある。増幅された検出電圧は分圧
抵抗により分圧された電圧が過電流検出回路３でその基
準電圧と比較され、それを越えると過電流検出信号を出
力し、制御回路１でドライブ回路２に供給されるパルス
幅変調された正弦波を停止して保護動作を行う。A feature of the present invention is that the detection voltage from the overcurrent detection resistor Rs is amplified by the amplifier 4 by about 10 times, and the amplified detection voltage is divided into the voltage dividing resistors R3 and R4 and one of them. The voltage is divided by using an external resistor R5 connected in series or in parallel. The amplified detection voltage is divided by the voltage dividing resistor and compared with the reference voltage in the overcurrent detection circuit 3, and when it exceeds the reference voltage, an overcurrent detection signal is output and supplied to the drive circuit 2 in the control circuit 1. The protection operation is performed by stopping the pulse width modulated sine wave.
【００２０】すなわち、分圧抵抗Ｒ３、Ｒ４の分圧抵抗
Ｒ４に直列に外付け抵抗Ｒ５を接続した場合は、分圧抵
抗Ｒ３、Ｒ４の接続点の分圧比は外付け抵抗Ｒ５により
上昇し、（Ｒ４＋Ｒ５）／（Ｒ３＋Ｒ４＋Ｒ５）とな
る。これにより外付け抵抗Ｒ５が無い状態（０Ω）で、
過電流保護レベルを例えば１０Ａに設定すると、外付け
抵抗Ｒ５が直列に接続されると過電流保護レベルを例え
ば８Ａに調整できる。このように過電流保護レベルは外
付け抵抗Ｒ５の抵抗値を選択することで小さい方向に調
整できる。That is, when the external resistor R5 is connected in series to the voltage dividing resistor R4 of the voltage dividing resistors R3 and R4, the voltage dividing ratio at the connection point of the voltage dividing resistors R3 and R4 is increased by the external resistor R5, (R4 + R5) / (R3 + R4 + R5). As a result, with no external resistor R5 (0Ω),
When the overcurrent protection level is set to, for example, 10 A, when the external resistor R5 is connected in series, the overcurrent protection level can be adjusted to, for example, 8 A. In this way, the overcurrent protection level can be adjusted in a smaller direction by selecting the resistance value of the external resistor R5.
【００２１】また、分圧抵抗Ｒ３、Ｒ４の分圧抵抗Ｒ４
に並列に外付け抵抗Ｒ５を接続した場合は、分圧抵抗Ｒ
３、Ｒ４の接続点の分圧比は外付け抵抗Ｒ５により減少
し、（Ｒ２・Ｒ３）／（Ｒ１・Ｒ２＋Ｒ２・Ｒ３＋Ｒ３
・Ｒ１）となる。これにより外付け抵抗Ｒ５が無い状態
で、過電流保護レベルを例えば１０Ａに設定すると、外
付け抵抗Ｒ５が並列に接続されると過電流保護レベルを
例えば１２Ａに調整できる。過電流保護レベルは外付け
抵抗Ｒ３の抵抗値を選択することで大きい方向に調整で
きるが、過電流保護レベルを大きくするためにはスイッ
チング素子の特性アップ等の必要があり、スイッチング
素子の特性から決まる上限値の範囲内で少しアップでき
る程度が便利である。Further, the voltage dividing resistance R4 of the voltage dividing resistances R3 and R4.
If an external resistor R5 is connected in parallel with the
The voltage division ratio of the connection point of 3 and R4 is reduced by the external resistance R5, and (R2 ・ R3) / (R1 ・ R2 + R2 ・ R3 + R3
・ R1). Thus, if the overcurrent protection level is set to, for example, 10 A without the external resistor R5, the overcurrent protection level can be adjusted to, for example, 12 A when the external resistor R5 is connected in parallel. The overcurrent protection level can be adjusted in a larger direction by selecting the resistance value of the external resistor R3. However, in order to increase the overcurrent protection level, it is necessary to improve the characteristics of the switching element. It is convenient to be able to increase a little within the upper limit.
【００２２】図２に、更に、具体化された過電流保護レ
ベルを小さくする本発明のインバータ回路の過電流保護
装置の回路図を示す。FIG. 2 is a circuit diagram of an overcurrent protection device for an inverter circuit according to the present invention, which further embodies the overcurrent protection level.
【００２３】スイッチング素子Ｑ４、Ｑ５、Ｑ６はイン
バータ回路の下側アームを構成し、過電流検出抵抗Ｒｓ
がスイッチング素子Ｑ４、Ｑ５、Ｑ６に共通に直列に接
続される。スイッチング素子Ｑ４、Ｑ５、Ｑ６の制御電
極にはドライバ回路２が接続され、インバータ回路を駆
動するパルス幅変調された正弦波の制御信号が制御回路
１から入力信号端子を介して供給されている。The switching elements Q4, Q5, Q6 form the lower arm of the inverter circuit, and the overcurrent detection resistor Rs
Are commonly connected in series to the switching elements Q4, Q5, Q6. A driver circuit 2 is connected to the control electrodes of the switching elements Q4, Q5, Q6, and a pulse-width-modulated sinusoidal control signal for driving an inverter circuit is supplied from the control circuit 1 via an input signal terminal.
【００２４】過電流検出抵抗Ｒｓからの検出電圧は増幅
器４で約１０倍に増幅される。増幅器４としてオペアン
プを用い、非反転入力端子（＋）に過電流検出抵抗Ｒｓ
からの検出電圧を入力し、反転入力端子（−）と接地電
位Ｖｓｓ間には帰還抵抗Ｒ１を接続し、反転入力端子
（−）と出力端子間には帰還抵抗Ｒ２を接続する。この
ような接続をすれば、増幅器４の出力電圧Ｖ0は以下の
ように規定される。The detection voltage from the overcurrent detection resistor Rs is amplified by the amplifier 4 about 10 times. An operational amplifier is used as the amplifier 4, and the overcurrent detection resistor Rs is connected to the non-inverting input terminal (+).
The detection resistance is input, the feedback resistor R1 is connected between the inverting input terminal (−) and the ground potential Vss, and the feedback resistor R2 is connected between the inverting input terminal (−) and the output terminal. With such a connection, the output voltage V 0 of the amplifier 4 is defined as follows.
【００２５】
Ｖ0＝（１＋Ｒ２／Ｒ１）（Ｉ0Ｒｓ−Ｖｏｓ）
ここで、Ｉ0はスイッチング素子を流れる電流、Ｖｏｓ
はオペアンプのオフセット電圧である。従って、増幅器
４からは過電流検出抵抗Ｒｓに発生する検出電圧Ｉ0Ｒ
ｓを約１０倍に増幅するように帰還抵抗Ｒ１、Ｒ２を設
定する。例えば、過電流保護レベルを２０Ａ、Ｒｓを
０．０１６７Ωとすると、検出電圧Ｉ0Ｒｓは０．３３
４Ｖであり、帰還抵抗Ｒ１を３．９ｋΩ、帰還抵抗Ｒ２
を２２ｋΩの増幅器４で増幅した検出電圧は２．２２Ｖ
程度になる。V 0 = (1 + R2 / R1) (I 0 Rs−Vos) where I 0 is the current flowing through the switching element, and Vos
Is the offset voltage of the operational amplifier. Therefore, the detection voltage I 0 R generated in the overcurrent detection resistor Rs from the amplifier 4
The feedback resistors R1 and R2 are set so as to amplify s about 10 times. For example, when the overcurrent protection level is 20 A and Rs is 0.0167Ω, the detection voltage I 0 Rs is 0.33.
4V, feedback resistor R1 is 3.9 kΩ, feedback resistor R2
Detection voltage amplified by 22kΩ amplifier 4 is 2.22V
It will be about.
【００２６】この増幅器４からの増幅した検出電圧は分
圧抵抗Ｒ３、Ｒ４に印可され、分圧抵抗Ｒ４の一端は外
部端子ＩＳＤに接続され、外部端子Ｖｓｓとの間に外付
け抵抗Ｒ５が接続される。すなわち、外付け抵抗Ｒ５を
用いて分圧される電圧が調整可能になる特徴を有する。The amplified detection voltage from the amplifier 4 is applied to the voltage dividing resistors R3 and R4, one end of the voltage dividing resistor R4 is connected to the external terminal ISD, and the external resistor R5 is connected to the external terminal Vss. To be done. That is, the voltage divided by the external resistor R5 can be adjusted.
【００２７】過電流検出回路３はコンパレータで構成さ
れ、一方の入力端子に基準電圧ｒｅｆを入力し、もう一
方の入力端子には分圧抵抗Ｒ３、Ｒ４の接続点の分圧電
圧を入力している。コンパレータの出力は過電流検出信
号を出力するＭＯＳ半導体素子の制御電極に印可され、
過電流検出信号が出力されるとこのＭＯＳ半導体素子は
オンして制御回路１に保護動作信号ＦＡＵＬＴを伝える
と同時に、インバータ回路を制御する制御信号を一定期
間ドライバ回路２に供給することを停止する保護動作を
行う。The overcurrent detection circuit 3 is composed of a comparator, which inputs the reference voltage ref to one input terminal and the divided voltage at the connection point of the voltage dividing resistors R3 and R4 to the other input terminal. There is. The output of the comparator is applied to the control electrode of the MOS semiconductor element that outputs the overcurrent detection signal,
When the overcurrent detection signal is output, this MOS semiconductor element is turned on to transmit the protection operation signal FAULT to the control circuit 1, and at the same time, stop supplying the control signal for controlling the inverter circuit to the driver circuit 2 for a certain period. Take protective action.
【００２８】上述したインバータ回路の過電流保護装置
では、外付け抵抗Ｒ５の働きにより分圧抵抗Ｒ３、Ｒ４
の接続点の分圧電圧を大きく調整できるので、過電流検
出抵抗Ｒｓを流れる電流が大きくなると、過電流検出回
路３で直ちに基準電圧を超えるので過電流保護レベルを
小さく調整できる。このために分圧抵抗Ｒ３、Ｒ４のみ
で例えば、１０Ａに設定した過電流保護レベルを外付け
抵抗Ｒ５の追加で例えば、８Ａに引き下げられる。In the above-mentioned inverter circuit overcurrent protection device, the voltage dividing resistors R3 and R4 are operated by the action of the external resistor R5.
Since the divided voltage at the connection point can be greatly adjusted, when the current flowing through the overcurrent detection resistor Rs becomes large, the overcurrent detection circuit 3 immediately exceeds the reference voltage, so that the overcurrent protection level can be adjusted to be small. Therefore, the overcurrent protection level set to, for example, 10 A only by the voltage dividing resistors R3 and R4 can be lowered to, for example, 8 A by adding the external resistor R5.
【００２９】図２において、外側の太い点線で囲まれた
領域は単一の混成集積回路基板を示しており、内側の細
い点線で囲まれた領域はドライバＩＣを示している。す
なわち、この混成集積回路基板にスイッチング素子Ｑ
１、Ｑ２、Ｑ３、Ｑ４、Ｑ５、Ｑ６、過電流検出抵抗Ｒ
ｓ、増幅器４、分圧抵抗Ｒ３、Ｒ４、ドライバ回路２と
過電流検出回路３を内在するドライバＩＣとが一体に組
み込まれ、混成集積回路基板の外側では外付け抵抗Ｒ３
が後から追加接続できる構成となっている。In FIG. 2, a region surrounded by a thick dotted line on the outside shows a single hybrid integrated circuit board, and a region surrounded by a thin dotted line on the inside shows a driver IC. That is, the switching element Q is provided on the hybrid integrated circuit board.
1, Q2, Q3, Q4, Q5, Q6, overcurrent detection resistor R
s, the amplifier 4, the voltage dividing resistors R3 and R4, the driver circuit 2 and the driver IC having the overcurrent detection circuit 3 therein are integrally incorporated, and the external resistor R3 is provided outside the hybrid integrated circuit board.
Is configured so that additional connections can be made later.
【００３０】図３を参照して、過電流保護レベルと外付
け抵抗Ｒ５との具体的な関係を示す。このインバータ回
路の過電流保護装置では、過電流検出抵抗Ｒｓ（０．０
１６７Ω）、分圧抵抗Ｒ１（２２ｋΩ）、分圧抵抗Ｒ２
（３．９ｋΩ）に設定されており、外付け抵抗Ｒ５をシ
ョートした場合の過電流保護レベルは２６．９３Ａにな
り、外付け抵抗Ｒ５を例えば２ｋΩに設定すると過電流
保護レベルは１９．１８Ａまで小さくできる。更に、外
付け抵抗Ｒ５の抵抗値を大きくすると図示のように過電
流保護レベルは小さくなる。With reference to FIG. 3, a specific relationship between the overcurrent protection level and the external resistor R5 is shown. In this overcurrent protection device for the inverter circuit, the overcurrent detection resistor Rs (0.0
167Ω), voltage dividing resistor R1 (22kΩ), voltage dividing resistor R2
(3.9kΩ), the overcurrent protection level when the external resistor R5 is shorted is 26.93A, and when the external resistor R5 is set to 2kΩ, the overcurrent protection level is up to 19.18A. Can be made smaller. Further, when the resistance value of the external resistor R5 is increased, the overcurrent protection level is decreased as shown in the figure.
【００３１】図４に、更に具体化された過電流保護レベ
ルを大きくする本発明のインバータ回路の過電流保護装
置の回路図を示す。FIG. 4 shows a more concrete circuit diagram of an overcurrent protection device for an inverter circuit according to the present invention for increasing the overcurrent protection level.
【００３２】スイッチング素子Ｑ４、Ｑ５、Ｑ６はイン
バータ回路の下側アームを構成し、過電流検出抵抗Ｒｓ
がスイッチング素子Ｑ４、Ｑ５、Ｑ６に共通に直列に接
続される。スイッチング素子Ｑ４、Ｑ５、Ｑ６の制御電
極にはドライバ回路２が接続され、インバータ回路を駆
動するパルス幅変調された正弦波の制御信号が制御回路
１から入力信号端子を介して供給されている。過電流検
出抵抗Ｒｓからの検出電圧は増幅器４で約１０倍程度に
増幅され、この増幅した検出電圧を分圧抵抗Ｒ３、Ｒ４
に印加する。分圧抵抗Ｒ３、Ｒ４の接続点は外部端子Ｉ
ＳＤに接続され、外部端子Ｖｓｓとの間に外付け抵抗Ｒ
５が接続され、分圧抵抗Ｒ４と並列になる。すなわち、
外付け抵抗Ｒ５を用いて分圧される電圧が調整可能にな
る特徴を有する。The switching elements Q4, Q5, Q6 form the lower arm of the inverter circuit, and the overcurrent detection resistor Rs
Are commonly connected in series to the switching elements Q4, Q5, Q6. A driver circuit 2 is connected to the control electrodes of the switching elements Q4, Q5, Q6, and a pulse-width-modulated sinusoidal control signal for driving an inverter circuit is supplied from the control circuit 1 via an input signal terminal. The detection voltage from the overcurrent detection resistor Rs is amplified about 10 times by the amplifier 4, and the amplified detection voltage is divided into voltage dividing resistors R3 and R4.
Apply to. The connection point of the voltage dividing resistors R3 and R4 is the external terminal I.
It is connected to SD and has an external resistor R between it and the external terminal Vss.
5 is connected and is in parallel with the voltage dividing resistor R4. That is,
It has a feature that the voltage divided by using the external resistor R5 can be adjusted.
【００３３】過電流検出回路３はコンパレータで構成さ
れ、一方の入力端子に基準電圧ｒｅｆを入力し、もう一
方の入力端子には分圧抵抗Ｒ３、Ｒ４の接続点の分圧電
圧を入力している。コンパレータの出力は過電流検出信
号を出力するＭＯＳ半導体素子の制御電極に印可され、
過電流検出信号が出力されるとこのＭＯＳ半導体素子は
オンして制御回路１に保護動作信号ＦＡＵＬＴを伝える
と同時に、インバータ回路を制御する制御信号を一定期
間ドライバ回路２に供給することを停止する保護動作を
行う。The overcurrent detection circuit 3 is composed of a comparator, which inputs the reference voltage ref to one input terminal and the divided voltage at the connection point of the voltage dividing resistors R3 and R4 to the other input terminal. There is. The output of the comparator is applied to the control electrode of the MOS semiconductor element that outputs the overcurrent detection signal,
When the overcurrent detection signal is output, this MOS semiconductor element is turned on to transmit the protection operation signal FAULT to the control circuit 1, and at the same time, stop supplying the control signal for controlling the inverter circuit to the driver circuit 2 for a certain period. Take protective action.
【００３４】上述したインバータ回路の過電流保護装置
では、外付け抵抗Ｒ５の働きにより分圧抵抗Ｒ３、Ｒ４
の接続点の分圧電圧を小さく調整できるので、過電流検
出抵抗Ｒｓを流れる電流が大きくなると、過電流検出回
路３で基準電圧を超えるので過電流保護レベルを大きく
調整できる。このために分圧抵抗Ｒ３、Ｒ４のみで例え
ば、１０Ａに設定した過電流保護レベルを外付け抵抗Ｒ
３の追加で例えば、１２Ａに引き上げられる。In the above-mentioned inverter circuit overcurrent protection device, the voltage dividing resistors R3 and R4 are operated by the action of the external resistor R5.
Since the divided voltage at the connection point can be adjusted to a small value, when the current flowing through the overcurrent detection resistor Rs becomes large, the overcurrent detection circuit 3 exceeds the reference voltage, so that the overcurrent protection level can be adjusted to a large level. For this reason, the overcurrent protection level set to, for example, 10 A is set only by the voltage dividing resistors R3 and R4 to the external resistor R.
With the addition of 3, it is raised to, for example, 12A.
【００３５】なお図４において、図２と同様に単一の混
成集積回路基板にスイッチング素子Ｑ１、Ｑ２、Ｑ３、
Ｑ４、Ｑ５、Ｑ６、過電流検出抵抗Ｒｓ、増幅器４、分
圧抵抗Ｒ３、Ｒ４、ドライバ回路２と過電流検出回路を
内在するドライバＩＣとが一体に組み込まれ、混成集積
回路基板の外側では外付け抵抗Ｒ５が後から追加接続で
きる構成となっている。In FIG. 4, as in FIG. 2, switching elements Q1, Q2, Q3, are formed on a single hybrid integrated circuit board.
Q4, Q5, Q6, overcurrent detection resistor Rs, amplifier 4, voltage dividing resistors R3, R4, driver circuit 2 and a driver IC having an overcurrent detection circuit are integrally incorporated, and outside the hybrid integrated circuit substrate, The mounting resistor R5 can be additionally connected later.
【００３６】[0036]
【発明の効果】本発明に依れば、微小な抵抗値の過電流
検出抵抗Ｒｓからの検出電圧を増幅器で増幅し、分圧抵
抗で分圧してコンパレータで基準電圧と比較して過電流
保護を行い、分圧抵抗の一方に直列あるいは並列に接続
される外付け抵抗を設けて分圧比を変えて過電流保護レ
ベルを調整可能とするので、過電流検出抵抗Ｒｓを混成
集積回路基板に組み込んでも外付け抵抗で過電流保護レ
ベルを調整できるインバータ回路の過電流保護装置を実
現できる。According to the present invention, the detection voltage from the overcurrent detection resistor Rs having a small resistance value is amplified by the amplifier, divided by the voltage dividing resistor and compared with the reference voltage by the comparator to protect against the overcurrent. Since an external resistor connected in series or in parallel to one of the voltage dividing resistors is provided so that the overcurrent protection level can be adjusted by changing the voltage dividing ratio, the overcurrent detection resistor Rs is incorporated in the hybrid integrated circuit board. However, it is possible to realize an overcurrent protection device for an inverter circuit that can adjust the overcurrent protection level with an external resistor.
【００３７】また、本発明では外付け抵抗を分圧抵抗の
一方に直列に接続するすることで、過電流保護レベルを
小さく調整できる利点がある。特に直流モータを負荷と
する場合には、過電流保護レベルを最初の初期値より小
さくして直流モータの減磁を防止することが出来る。Further, in the present invention, there is an advantage that the overcurrent protection level can be adjusted to be small by connecting the external resistor in series with one of the voltage dividing resistors. Particularly when a DC motor is used as a load, the overcurrent protection level can be made smaller than the initial value to prevent demagnetization of the DC motor.
【００３８】更に、本発明では外付け抵抗を分圧抵抗の
一方に並列に接続するすることで、過電流保護レベルを
大きく調整できる利点がある。これにより従来では混成
集積回路基板に過電流検出抵抗Ｒｓを組み込んだ時点で
過電流保護レベルが一律に決められていたが、本発明で
は過電流保護レベルを大きく調整したり、あるいは前述
の様に小さく調整できるので、インバータ回路装置の機
種数を大幅に減らしても任意の過電流保護レベルに対応
できる利点も有する。Further, the present invention has an advantage that the overcurrent protection level can be greatly adjusted by connecting the external resistor in parallel with one of the voltage dividing resistors. As a result, in the past, the overcurrent protection level was uniformly determined when the overcurrent detection resistor Rs was incorporated in the hybrid integrated circuit board, but in the present invention, the overcurrent protection level is adjusted to a large level, or as described above. Since the adjustment can be made small, there is also an advantage that any overcurrent protection level can be dealt with even if the number of models of the inverter circuit device is greatly reduced.
【図１】本発明のインバータ回路の過電流保護装置を説
明するブロック図である。FIG. 1 is a block diagram illustrating an overcurrent protection device for an inverter circuit according to the present invention.
【図２】本発明のインバータ回路の過電流保護装置を説
明する回路図である。FIG. 2 is a circuit diagram illustrating an overcurrent protection device for an inverter circuit according to the present invention.
【図３】本発明のインバータ回路の過電流保護装置の過
電流保護レベルを説明する特性図である。FIG. 3 is a characteristic diagram illustrating an overcurrent protection level of an overcurrent protection device for an inverter circuit according to the present invention.
【図４】本発明のインバータ回路の過電流保護装置を説
明する回路図である。FIG. 4 is a circuit diagram illustrating an overcurrent protection device for an inverter circuit according to the present invention.
【図５】従来のインバータ回路装置を説明するブロック
図である。FIG. 5 is a block diagram illustrating a conventional inverter circuit device.
Ｑ１、Ｑ２、Ｑ３、Ｑ４、Ｑ５、Ｑ６ スイッチング
素子
Ｒｓ 過電流検出抵抗、
Ｒ３、Ｒ４ 分圧抵抗
Ｒ５ 外付け抵抗
１ 制御回路
２ ドライバ回路
３ 過電流検出回路
４ 増幅器Q1, Q2, Q3, Q4, Q5, Q6 Switching element Rs Overcurrent detection resistor, R3, R4 Voltage dividing resistor R5 External resistor 1 Control circuit 2 Driver circuit 3 Overcurrent detection circuit 4 Amplifier
───────────────────────────────────────────────────── フロントページの続き (72)発明者 大川 克実 大阪府守口市京阪本通２丁目５番５号 三 洋電機株式会社内 (72)発明者 泉谷 壮一 大阪府守口市京阪本通２丁目５番５号 三 洋電機株式会社内 Ｆターム(参考） 5G004 AA05 AB02 BA04 DA02 DC02 EA01 5G053 AA01 BA01 CA01 DA01 EA09 EB01 EC03 FA04 5H007 BB06 CA01 CB02 CB05 CC01 CC07 DB01 EA02 FA03 FA12 FA13 FA19 ─────────────────────────────────────────────────── ─── Continued front page (72) Inventor Katsumi Okawa 2-5-3 Keihan Hondori, Moriguchi City, Osaka Prefecture Within Yo Denki Co., Ltd. (72) Inventor Soichi Izumiya 2-5-3 Keihan Hondori, Moriguchi City, Osaka Prefecture Within Yo Denki Co., Ltd. F-term (reference) 5G004 AA05 AB02 BA04 DA02 DC02 EA01 5G053 AA01 BA01 CA01 DA01 EA09 EB01 EC03 FA04 5H007 BB06 CA01 CB02 CB05 CC01 CC07 DB01 EA02 FA03 FA12 FA13 FA19
Claims (4)
子を駆動するドライブ回路と、該ドライブ回路に入力さ
れ負荷を制御する制御信号を発生する制御回路とを備え
たインバータ回路装置において、 前記スイッチング素子、前記ドライブ回路、前記スイッ
チング素子に接続された過電流検出抵抗を単一の混成集
積回路基板に組み込み、 前記過電流検出抵抗からの検出電圧を増幅器で増幅し、
分圧抵抗で分圧して過電流検出回路で基準電圧と比較し
て過電流保護を行い、前記分圧抵抗の一方に直列あるい
は並列に外付け抵抗を接続して分圧比を変えて前記過電
流保護レベルを調整可能とすることを特徴としたインバ
ータ回路の過電流保護装置。1. An inverter circuit device comprising a switching element, a drive circuit that drives the switching element, and a control circuit that generates a control signal that is input to the drive circuit to control a load, the switching element comprising: A drive circuit, the overcurrent detection resistor connected to the switching element is incorporated into a single hybrid integrated circuit board, the detection voltage from the overcurrent detection resistor is amplified by an amplifier,
It divides with a voltage dividing resistor and compares with a reference voltage with an overcurrent detection circuit to protect against overcurrent.By connecting an external resistor in series or in parallel with one of the voltage dividing resistors, the voltage dividing ratio is changed to change the overcurrent. An overcurrent protection device for an inverter circuit, which is capable of adjusting a protection level.
基板に組み込まれたことを特徴とする請求項１に記載の
インバータ回路の過電流保護装置。2. The overcurrent protection device for an inverter circuit according to claim 1, wherein the voltage dividing resistor is also incorporated in the single hybrid integrated circuit board.
直列に接続され、前記過電流検出回路に入力される分圧
電圧を大きくして過電流保護レベルを小さくすることを
特徴とする請求項１または請求項２に記載のインバータ
回路の過電流保護装置。3. The external resistor is connected in series with one of the voltage dividing resistors, and increases the divided voltage input to the overcurrent detection circuit to reduce the overcurrent protection level. An overcurrent protection device for an inverter circuit according to claim 1 or 2.
並列に接続され、前記過電流検出回路に入力される分圧
電圧を小さくして過電流保護レベルを大きくすることを
特徴とする請求項１または請求項２に記載のインバータ
回路の過電流保護装置。4. The external resistor is connected in parallel to one of the voltage dividing resistors, and reduces the divided voltage input to the overcurrent detection circuit to increase the overcurrent protection level. An overcurrent protection device for an inverter circuit according to claim 1 or 2.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002121753A JP3863805B2 (en) | 2002-04-24 | 2002-04-24 | Overcurrent protection device for inverter circuit |
| CNB031232531A CN100521437C (en) | 2002-04-24 | 2003-04-24 | Mixed integrated circuit equiped with overcurrent protector |
| US10/422,556 US7136269B2 (en) | 2002-04-24 | 2003-04-24 | Inverted circuit overcurrent protection device and hybrid integrated circuit device with the same incorporated |
| US11/533,211 US7609498B2 (en) | 2002-04-24 | 2006-09-19 | Inverted circuit overcurrent protection device and hybrid integrated circuit device with the same incorporated |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002121753A JP3863805B2 (en) | 2002-04-24 | 2002-04-24 | Overcurrent protection device for inverter circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2003319552A true JP2003319552A (en) | 2003-11-07 |
| JP3863805B2 JP3863805B2 (en) | 2006-12-27 |
Family
ID=29537564
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2002121753A Expired - Fee Related JP3863805B2 (en) | 2002-04-24 | 2002-04-24 | Overcurrent protection device for inverter circuit |
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| Country | Link |
|---|---|
| JP (1) | JP3863805B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100633480B1 (en) | 2004-10-22 | 2006-10-16 | 엘지이노텍 주식회사 | OVP stabilizing circuit for invertor |
| JP2011503613A (en) * | 2007-11-20 | 2011-01-27 | クウォリタウ・インコーポレーテッド | Voltage source measurement unit with minimum common mode error |
| JP2012228031A (en) * | 2011-04-18 | 2012-11-15 | Sharp Corp | Motor control circuit |
-
2002
- 2002-04-24 JP JP2002121753A patent/JP3863805B2/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100633480B1 (en) | 2004-10-22 | 2006-10-16 | 엘지이노텍 주식회사 | OVP stabilizing circuit for invertor |
| JP2011503613A (en) * | 2007-11-20 | 2011-01-27 | クウォリタウ・インコーポレーテッド | Voltage source measurement unit with minimum common mode error |
| JP2012228031A (en) * | 2011-04-18 | 2012-11-15 | Sharp Corp | Motor control circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3863805B2 (en) | 2006-12-27 |
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