JPH05227744A - Circuit for detecting current flowing through switching element - Google Patents
Circuit for detecting current flowing through switching elementInfo
- Publication number
- JPH05227744A JPH05227744A JP2870392A JP2870392A JPH05227744A JP H05227744 A JPH05227744 A JP H05227744A JP 2870392 A JP2870392 A JP 2870392A JP 2870392 A JP2870392 A JP 2870392A JP H05227744 A JPH05227744 A JP H05227744A
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- Japan
- Prior art keywords
- current
- circuit
- detection
- switching element
- impedance
- Prior art date
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Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、スイッチング電源装
置やインバ−タ装置等、スイッチング素子をオン・オフ
することにより出力直流電圧または電流を制御する装置
において、スイッチング素子に流れるパルス電流を検出
するために用いる電流検出回路に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention detects a pulse current flowing through a switching element in an apparatus for controlling an output DC voltage or current by turning on / off a switching element such as a switching power supply unit or an inverter unit. The present invention relates to a current detection circuit used for that purpose.
【０００２】[0002]
【従来の技術】直流電源の出力電圧を異なる電圧の直流
電流に変換して負荷回路に供給する例えばＤＣ−ＤＣコ
ンバ−タ回路においては、トランジスタ，サイリスタ等
のスイッチング素子のスイッチング周期に占める通流時
間の割合（時比率）を制御することにより、出力電圧ま
たは出力電流の制御が行われる。スイッチング素子に流
れる電流を負荷電流に対応して制御するためには、スイ
ッチング素子に流れるパルス電流を検出し、その検出信
号に対応してスイッチング素子を時比率制御することに
より出力直流電圧を規定値に保持することが必要であ
り、従来パルス電流の検出には抵抗分流器（シャント抵
抗）が用いられていた。2. Description of the Related Art In a DC-DC converter circuit, for example, which converts an output voltage of a DC power supply into a DC current of a different voltage and supplies it to a load circuit, a current flowing in a switching cycle of a switching element such as a transistor or a thyristor. The output voltage or output current is controlled by controlling the time ratio (duty ratio). In order to control the current flowing through the switching element in accordance with the load current, the pulse current flowing through the switching element is detected and the switching element is controlled in proportion to the detection signal to control the output DC voltage to the specified value. It is necessary to keep the current at a high level, and conventionally, a resistance shunt (shunt resistance) was used to detect the pulse current.
【０００３】[0003]
【発明が解決しようとする課題】時比率の制御回路に入
力されるパルス電流の検出信号は、電源回路の電圧やノ
イズが制御回路に影響を及ぼすことを回避するために、
電源回路から電気的に絶縁された信号であることが求め
られる。ところが、シャント抵抗を用いた電流検出回路
の場合、検出信号を電源回路と電気的に絶縁することが
困難であり、その信号の取扱に苦慮しているのが実情で
あり、その対策が求められている。また、変流器を用い
ることにより、電源回路から電気的に絶縁された検出信
号を容易に取り出せると期待されるが、この場合単極性
のパルス電流によって変流器の鉄心が磁気飽和する直流
偏磁現象が発生し、パルス電流の検出が不可能になると
いう問題が新たに発生する。The pulse current detection signal input to the duty ratio control circuit is provided in order to prevent the voltage and noise of the power supply circuit from affecting the control circuit.
The signal is required to be electrically isolated from the power supply circuit. However, in the case of a current detection circuit using a shunt resistor, it is difficult to electrically insulate the detection signal from the power supply circuit, and the fact is that it is difficult to handle the signal, and countermeasures are required. ing. In addition, it is expected that the detection signal electrically isolated from the power supply circuit can be easily taken out by using the current transformer, but in this case, the unipolar pulse current causes DC bias in which the iron core of the current transformer is magnetically saturated. A new problem arises that a magnetic phenomenon occurs and it becomes impossible to detect the pulse current.
【０００４】この発明の目的は、変流器が直流偏磁する
ことなく、電源回路から電気的に絶縁された電流検出信
号を出力できるパルス電流の検出回路を得ることにあ
る。An object of the present invention is to obtain a pulse current detection circuit capable of outputting a current detection signal electrically insulated from a power supply circuit without the current transformer being biased by direct current.
【０００５】[0005]
【課題を解決するための手段】上記課題を解決するため
に、この発明によれば、直流電源の出力電流をオン・オ
フ制御するスイッチング素子の電源回路側に接続されて
パルス電流を検出するものにおいて、前記パルス電流を
検出する変流器と、その二次巻線に直列接続されて検出
電流をこれに比例した検出電圧に変換して出力する電流
検出インピ−ダンスと、前記電流検出インピ−ダンスに
直列接続されて前記検出電流の通流方向を一方向に規制
する動作切換ダイオ−ド，および前記変流器の二次巻線
に並列接続されて前記動作切換ダイオ−ドで阻止された
前記二次巻線の逆方向電流を通流する放電回路からなる
直流偏磁の防止手段とを備えてなるものとする。In order to solve the above-mentioned problems, according to the present invention, a pulse current is detected by being connected to a power supply circuit side of a switching element for controlling on / off of an output current of a DC power supply. A current transformer for detecting the pulse current, a current detection impedance connected in series to the secondary winding of the current transformer for converting the detection current into a detection voltage proportional to the current and outputting the detected voltage, and the current detection impedance. An operation switching diode connected in series to the dance to regulate the flow direction of the detected current in one direction, and connected in parallel to the secondary winding of the current transformer and blocked by the operation switching diode. And a means for preventing DC bias magnetization, which is composed of a discharge circuit that allows a reverse current of the secondary winding to flow therethrough.
【０００６】また、放電回路が、電流検出インピ−ダン
スに比べて高いインピ−ダンスを有する放電インピ−ダ
ンス回路からなるものとする。さらに、放電回路が、通
流方向が互いに逆向きに直列接続された一対のツェナ−
ダイオ−ドであるものとする。Further, it is assumed that the discharge circuit comprises a discharge impedance circuit having a higher impedance than the current detection impedance. Further, the discharge circuit includes a pair of zeners that are connected in series so that the flow directions are opposite to each other.
It is assumed to be a diode.
【０００７】[0007]
【作用】この発明の構成において、スイッチング素子に
流れるパルス電流を検出する変流器と、その二次巻線に
直列接続された電流検出インピ−ダンスとで構成される
電流検出回路に、電流検出インピ−ダンスに直列接続さ
れて検出電流の通流方向を一方向に規制する動作切換ダ
イオ−ドと、変流器の二次巻線に並列接続されて動作切
換ダイオ−ドで阻止された二次巻線の逆方向電流を通流
する放電回路とからなる直流偏磁の防止手段を設けるよ
う構成したことにより、スイッチング素子がオンした状
態では動作切換ダイオ−ドを介して電流検出インピ−ダ
ンスに変流器の二次巻線電流が流れ、電流検出インピ−
ダンスでパルス電流と相似な電圧波形に変換された検出
信号を、例えばスイッチング素子の制御回路に供給する
機能が得られる。また、単極性のパルス電流により変流
器の鉄心に蓄積された磁気エネルギ−は、スイッチング
素子がオフした状態で変流器の二次巻線にパルス電流と
は逆極性の電圧を誘起するが、この電圧による逆方向電
流は動作切換ダイオ−ドにより通流が阻止されて電流検
出インピ−ダンスでの検出を回避できるとともに、逆極
性の電圧によって放電回路に逆方向電流が流れて鉄心の
磁気エネルギ−が放出されるので、変流器が直流偏磁す
ることなく電源回路から電気的に絶縁された検出信号を
スイッチング素子の制御回路に供給する機能が得られ
る。In the structure of the present invention, the current detecting circuit is composed of the current transformer for detecting the pulse current flowing through the switching element and the current detecting impedance connected in series to the secondary winding of the current transformer. An operation switching diode connected in series with the impedance to regulate the flow direction of the detected current in one direction, and an operation switching diode connected in parallel to the secondary winding of the current transformer and blocked by the operation switching diode. Since the means for preventing DC bias magnetism, which is composed of a discharge circuit that allows the reverse current of the next winding to flow therethrough, is provided, the current detection impedance is supplied via the operation switching diode when the switching element is on. The secondary winding current of the current transformer flows through the
A function of supplying the detection signal converted into a voltage waveform similar to the pulse current by the dance to the control circuit of the switching element can be obtained. Moreover, the magnetic energy accumulated in the iron core of the current transformer by the unipolar pulse current induces a voltage of the opposite polarity to the pulse current in the secondary winding of the current transformer with the switching element turned off. The reverse current due to this voltage is blocked by the operation switching diode to prevent detection by the current detection impedance, and the reverse current flows through the discharge circuit due to the reverse polarity voltage, causing Since the energy is released, it is possible to obtain the function of supplying the detection signal electrically insulated from the power supply circuit to the control circuit of the switching element without the current transformer being biased by the direct current.
【０００８】また、放電回路を電流検出インピ−ダンス
に比べて高いインピ−ダンスを有する放電インピ−ダン
ス回路で構成すれば、検出電流が放電回路に分流するこ
とによる検出誤差を回避する機能が得られる。さらに、
放電回路を通流方向が互いに逆向きに直列接続された一
対のツェナ−ダイオ−ドで構成すれば、一方のツェナ−
ダイオ−ドのツェナ−電圧により検出電流が放電回路に
分流することを回避できるとともに、他方のツェナ−ダ
イオ−ドのツェナ−電圧を越える逆方向電圧により放電
回路に電流が流れて直流偏磁を防止する機能が得られ
る。Further, if the discharge circuit is composed of a discharge impedance circuit having a higher impedance than the current detection impedance, a function of avoiding a detection error due to the detection current being shunted to the discharge circuit is obtained. Be done. further,
If the discharge circuit is composed of a pair of Zener diodes connected in series in opposite directions, one Zener diode
The Zener voltage of the diode can prevent the detection current from being shunted to the discharge circuit, and the reverse voltage exceeding the Zener voltage of the other Zener diode causes a current to flow in the discharge circuit to cause DC bias. The function to prevent is obtained.
【０００９】[0009]
【実施例】以下、この発明を実施例に基づいて説明す
る。図１はこの発明の実施例になるスイッチング素子に
流れる電流の検出回路を降圧形のＤＣ−ＤＣコンバ−タ
回路を例に示す接続図である。図において、直流電源３
の出力電圧は電界効果トランジスタからなり制御回路２
により所定の時比率で制御されるスイッチング素子１に
よりオンオフ制御され、スイッチング素子１に流れるパ
ルス電流ｉp は、リアクトル４，平滑コンデンサ５，お
よび帰還ダイオ−ド６からなる平滑回路で直流電流に変
換され、外部負荷９に供給される。このように構成され
たＤＣ−ＤＣコンバ−タ回路には、パルス電流ｉp の検
出回路１０が設けられる。EXAMPLES The present invention will be described below based on examples. FIG. 1 is a connection diagram showing a step-down DC-DC converter circuit as an example of a current detection circuit for a switching element according to an embodiment of the present invention. In the figure, DC power supply 3
The output voltage of the control circuit 2 consists of a field effect transistor.
Is on-off controlled by a switching element 1 which is controlled by the ratio when a predetermined by the pulse current i p flowing through the switching device 1, reactor 4, smoothing capacitor 5, and a feedback diode - converted into a direct current by the smoothing circuit consisting of de 6 And is supplied to the external load 9. Thus configured DC-DC converter - the capacitor circuit, the detection circuit 10 of the pulse current i p is provided.
【００１０】電流検出回路１０は、スイッチング素子１
の電源回路側に一次側が接続されてパルス電流ｉp を検
出する変流器１２、および変流器１２の二次巻線１２Ｓ
に直列接続された電流検出インピ−ダンス１３とからな
る電流検出回路部分と、電流検出インピ−ダンス１３に
直列接続されて検出電流ｉs の通流方向を一方向に規制
する動作切換ダイオ−ド１４，および変流器の二次巻線
１２Ｓに並列接続されて動作切換ダイオ−ド１４で通流
が阻止された二次巻線の逆方向電流ｉd を通流する放電
インピ−ダンス１５とからなる直流偏磁の防止手段１１
とで構成される。なお、放電インピ−ダンス１５のイン
ピ−ダンス値（または抵抗値）Ｒ2 は、電流検出インピ
−ダンス１３のインピ−ダンス値Ｒ1 に比べて少なくと
も１桁以上大きな値に設定される。The current detection circuit 10 includes a switching element 1
Current transformer 12 primary side of the power supply circuit side detects the pulse current i p is connected, and the current transformer 12 secondary winding 12S
Series connected current detection Inpi to - a current detection circuit part consisting of dance 13. The current detection Inpi - operation switch for regulating the flow direction of the series-connected to the detection current i s dancing 13 in one direction diode - de 14, and a discharge impedance 15 that flows in the reverse current i d of the secondary winding that is connected in parallel to the secondary winding 12S of the current transformer and is prevented from flowing by the operation switching diode 14. Means 11 for preventing DC bias magnetism
Composed of and. The impedance value (or resistance value) R 2 of the discharge impedance 15 is set to a value that is at least one digit larger than the impedance value R 1 of the current detection impedance 13.
【００１１】図２はこの発明の異なる実施例になるスイ
ッチング素子に流れる電流の検出回路の要部を示す接続
図であり、電流検出回路２０の直流偏磁防止手段２１
を、動作切換ダイオ−ド１４と、通流方向を互いに逆向
きに直列接続した一対のツェナ−ダイオ−ド２５Ａ，２
５Ｂからなる放電回路２５とで構成した点が前述の実施
例と異なっており、パルス電流ｉp に対応して二次巻線
１２Ｓに流れる検出電流ｉs はツェナ−ダイオ−ド２５
Ｂによって放電回路２５への通流が阻止され、動作切換
ダイオ−ド１４を介して電流検出インピ−ダンス１３に
流れて電圧信号ｖ 1 に変換される。FIG. 2 shows a switch according to another embodiment of the present invention.
Connection showing the main part of the detection circuit for the current flowing through the switching element
FIG. 4 is a diagram showing a DC bias magnetic field prevention means 21 of the current detection circuit 20.
, The operation switching diode 14 and the flow direction are opposite to each other.
A pair of Zener diodes 25A, 2 connected in series
The point that it is configured with the discharge circuit 25 composed of 5B
Different from the example, pulse current ipCorresponding to the secondary winding
Detection current i flowing in 12SsIs Zener diode 25
B blocks the flow to the discharge circuit 25 and switches the operation.
The current detection impedance 13 via the diode 14
Flowing voltage signal v 1Is converted to.
【００１２】図３は実施例になるスイッチング素子に流
れる電流の検出回路の動作を示すタイムチャ−トであ
り、スイッチング素子１がオンしてパルス電流ｉp が流
れると、変流器１２の二次巻線１２Ｓにはパルス電流に
比例した電圧ｖonが誘導され、動作切換ダイオ−ド１４
を介して電流検出インピ−ダンス１３に変流器の検出電
流ｉs が流れ、電流検出インピ−ダンス１４でパルス電
流と相似な波形の電圧信号ｖ1 に変換される。なお、こ
のとき放電インピ−ダンス１５のインピ−ダンスＲ2 を
電流検出インピ−ダンス１３のインピ−ダンスＲ1 より
遙かに高く設定するか、あるいは放電回路にツェナ−ダ
イオ−ド２５Ｂを設けることにより、検出電流ｉs が放
電回路に分流することを阻止できるので、いかなる時比
率のパルス電流に対しても電圧信号波形をパルス電流波
形と相似に保持できるとともに、この電圧信号ｖ1 は変
流器１２により電源回路から電気的に絶縁されているの
で、特別の信号処理を行うことなくスイッチング素子の
制御回路２に電圧信号ｖ1 を供給してスイッチング素子
１の次比率制御を行うことができる。[0012] Figure 3 is time chart illustrating an operation of the detection circuit of the current flowing through the switching element becomes example - a preparative, flows a pulse current i p switching element 1 is turned on, second current transformer 12 primary the windings 12S is induced voltage v on which is proportional to the pulse current, the operation switching diode - de 14
Through the current detecting Inpi - detection current i s of current transformer dance 13 flows, the current detection Inpi - is converted dance 14 into a voltage signal v 1 of the pulse current, similar to a waveform. At this time, the impedance R 2 of the discharge impedance 15 is set to be much higher than the impedance R 1 of the current detection impedance 13, or the Zener diode 25B is provided in the discharge circuit. By this, it is possible to prevent the detection current i s from being shunted to the discharge circuit, so that the voltage signal waveform can be held similar to the pulse current waveform with respect to the pulse current of any duty ratio, and this voltage signal v 1 is transformed. Since it is electrically insulated from the power supply circuit by the device 12, it is possible to supply the voltage signal v 1 to the control circuit 2 of the switching element and perform the next ratio control of the switching element 1 without performing special signal processing. ..
【００１３】一方、パルス電流ｉp により、変流器１２
の鉄心には磁気エネルギ−が蓄積され、スイッチング素
子１がオフしてパルス電流が遮断されると同時に変流器
の二次巻線には高いレベルの逆方向電圧ｖoff が発生す
る。この電圧による逆方向電流ｉd は動作切換ダイオ−
ド１４により電流検出インピ−ダンス１３への通流が阻
止されるので電圧信号ｖ1 への影響はなく、パルス電流
ｉp と相似な波形を保持した電圧信号ｖ1 が得られると
ともに、逆方向電流ｉd が放電インピ−ダンス１５に流
れて鉄心の蓄積磁気エネルギ−が放出されることによ
り、変流器が直流偏磁することなく電源回路から電気的
に絶縁された検出信号をスイッチング素子の制御回路に
供給することができる。なお、放電回路２５をツェナ−
ダイオ−ドで構成した場合には、逆方向電圧ｖoff がツ
ェナ−ダイオ−ド２５Ａのツェナ−電圧を越えた時点で
放電回路２５に逆方向電流ｉd が流れるので、より高い
直流偏磁の防止機能が得られる。On the other hand, the current transformer 12 is driven by the pulse current i p.
Magnetic energy is stored in the core of the switching element 1, the switching element 1 is turned off and the pulse current is cut off, and at the same time, a high level reverse voltage v off is generated in the secondary winding of the current transformer. The reverse current i d due to this voltage is the operation switching diode.
Current detecting Inpi by de 14 - no influence on the voltage signal v 1 since flow of dance 13 is prevented, along with the voltage signal v 1 which holds the pulse current i p a similar waveform is obtained, reverse The current i d flows through the discharge impedance 15 and the accumulated magnetic energy of the iron core is released, so that the current transformer is not subjected to DC bias magnetization, and the detection signal electrically insulated from the power supply circuit is supplied to the switching element. It can be supplied to the control circuit. In addition, the discharge circuit 25 is a Zener.
In the case of the diode configuration, the reverse current i d flows through the discharge circuit 25 at the time when the reverse voltage v off exceeds the Zener voltage of the Zener diode 25A, so that a higher DC bias is generated. Preventive function is obtained.
【００１４】[0014]
【発明の効果】この発明は前述のように、スイッチング
素子に流れるパルス電流を検出する変流器と、その二次
巻線に直列接続された電流検出インピ−ダンスとで構成
される電流検出回路に、電流検出インピ−ダンスに直列
接続されて検出電流の通流方向を一方向に規制する動作
切換ダイオ−ドと、変流器の二次巻線に並列接続されて
動作切換ダイオ−ドで阻止された二次巻線の逆方向電流
を通流する放電回路とからなる直流偏磁の防止手段を設
けるよう構成した。その結果、検出電流は電流検出回路
を流れて電源回路と電気的に絶縁された電圧信号を出力
できるとともに、逆方向電流が放電回路を流れて変流器
鉄心の蓄積磁気エネルギ−を放出するので、変流器が直
流偏磁することなく電源回路から電気的に絶縁された検
出信号をスイッチング素子の制御回路に供給できる従来
技術に無い機能を備えたスイッチング素子に流れる電流
の検出回路を提供することができる。As described above, the present invention is a current detection circuit composed of a current transformer for detecting a pulse current flowing in a switching element and a current detection impedance connected in series to its secondary winding. Is connected in series to the current detection impedance and regulates the flow direction of the detected current in one direction, and the operation switching diode is connected in parallel to the secondary winding of the current transformer. A means for preventing DC bias magnetism is provided, which is composed of a discharge circuit that allows the reverse current of the blocked secondary winding to flow. As a result, the detected current flows through the current detection circuit to output a voltage signal electrically isolated from the power supply circuit, and the reverse current flows through the discharge circuit to release the magnetic energy accumulated in the current transformer core. Provided is a detection circuit for a current flowing through a switching element, which has a function which is not available in the prior art and which can supply a detection signal electrically insulated from a power supply circuit to a control circuit for a switching element without a current transformer being biased by direct current. be able to.
【００１５】また、電流検出回路部と直流偏磁防止手段
との動作の切換えが１個のダイオ−ドで済み、かつ放電
回路も抵抗あるいはツェナ−ダイオ−ドで構成でき、さ
らに変流器もスイッチング周期を短縮することにより小
型化できるので、パルス電流波形の検出精度が高く、優
れた直流偏磁防止機能を有するスイッチング素子に流れ
る電流の検出回路を経済的にも有利に提供できる利点が
得られる。Further, the operation of switching between the current detection circuit section and the DC bias magnetism prevention means can be performed by one diode, and the discharge circuit can be constituted by a resistor or a Zener diode, and a current transformer can also be provided. Since the size can be reduced by shortening the switching cycle, the detection accuracy of the pulse current waveform is high, and there is an advantage that the detection circuit of the current flowing through the switching element with the excellent DC bias prevention function can be provided economically and advantageously. Be done.
【図１】この発明の実施例になるスイッチング素子に流
れる電流の検出回路を降圧形のＤＣ−ＤＣコンバ−タ回
路を例に示す接続図FIG. 1 is a connection diagram showing a step-down DC-DC converter circuit as an example of a detection circuit of a current flowing through a switching element according to an embodiment of the present invention.
【図２】この発明の異なる実施例になるスイッチング素
子に流れる電流の検出回路の要部を示す接続図FIG. 2 is a connection diagram showing a main part of a detection circuit of a current flowing through a switching element according to another embodiment of the present invention.
【図３】実施例になるスイッチング素子に流れる電流の
検出回路の動作を示すタイムチャ−トFIG. 3 is a time chart showing the operation of the detection circuit of the current flowing through the switching element according to the embodiment.
【符号の説明】 １ スイッチング素子 ２ 制御回路 ３ 直流電源 １０ 電流検出回路 １１ 直流偏磁防止手段 １２ 変流器 １２Ｓ 二次巻線 １３ 電流検出インピ−ダンス １４ 動作切換ダイオ−ド １５ 放電インピ−ダンス ２０ 電流検出回路 ２５ 放電回路 ２５Ａ ツェナ−ダイオ−ド ２５Ｂ ツェナ−ダイオ−ド ｉp パルス電流 ｉs 検出電流 ｖ1 電圧信号 ｉd 逆方向電流 ｖon 二次巻線電圧（スイッチング素子がオンした状
態） ｖoff 逆方向電圧（スイッチング素子がオフした状態）[Description of Reference Signs] 1 switching element 2 control circuit 3 direct current power supply 10 current detection circuit 11 direct current bias prevention means 12 current transformer 12S secondary winding 13 current detection impedance 14 operation switching diode 15 discharge impedance 20 current detecting circuit 25 and discharge circuit 25A Zener - diode - de 25B Zener - diode - state de i p pulse current i s detected current v 1 voltage signal i d reverse current v on the secondary winding voltage (the switching element is turned on ) V off reverse voltage (switching element is off)
Claims (3)
スイッチング素子の電源回路側に接続されてパルス電流
を検出するものにおいて、前記パルス電流を検出する変
流器と、その二次巻線に直列接続されて検出電流をこれ
に比例した検出電圧に変換して出力する電流検出インピ
−ダンスと、前記電流検出インピ−ダンスに直列接続さ
れて前記検出電流の通流方向を一方向に規制する動作切
換ダイオ−ド，および前記変流器の二次巻線に並列接続
されて前記動作切換ダイオ−ドで阻止された前記二次巻
線の逆方向電流を通流する放電回路からなる直流偏磁の
防止手段とを備えてなることを特徴とするスイッチング
素子に流れる電流の検出回路。1. A current transformer for detecting a pulse current, which is connected to a power supply circuit side of a switching element for controlling on / off of an output current of a DC power supply, and a current transformer for detecting the pulse current, and a secondary winding thereof. And a current detection impedance that is connected in series with the detection current to convert the detection current into a detection voltage that is proportional to the detection current and outputs the detection voltage, and the current detection impedance is connected in series to regulate the flow direction of the detection current in one direction. And a direct current circuit comprising a discharge circuit for connecting a reverse current of the secondary winding, which is connected in parallel with the secondary winding of the current transformer and is blocked by the operation switching diode. A circuit for detecting a current flowing through a switching element, characterized in that it comprises a means for preventing magnetic bias.
べて高いインピ−ダンスを有する放電インピ−ダンス回
路からなることを特徴とする請求項１記載のスイッチン
グ素子に流れる電流の検出回路。2. The circuit for detecting a current flowing through a switching element according to claim 1, wherein the discharge circuit comprises a discharge impedance circuit having a higher impedance than the current detection impedance.
列接続された一対のツェナ−ダイオ−ドであることを特
徴とする請求項１記載のスイッチング素子に流れる電流
の検出回路。3. A detection circuit for a current flowing through a switching element according to claim 1, wherein the discharge circuit is a pair of Zener diodes connected in series so that the flow directions are opposite to each other.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2870392A JPH05227744A (en) | 1992-02-17 | 1992-02-17 | Circuit for detecting current flowing through switching element |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2870392A JPH05227744A (en) | 1992-02-17 | 1992-02-17 | Circuit for detecting current flowing through switching element |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05227744A true JPH05227744A (en) | 1993-09-03 |
Family
ID=12255828
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2870392A Pending JPH05227744A (en) | 1992-02-17 | 1992-02-17 | Circuit for detecting current flowing through switching element |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05227744A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013243927A (en) * | 2013-07-04 | 2013-12-05 | Mitsubishi Electric Corp | Drive electric power supply device for vehicle |
| JP2014171385A (en) * | 2014-04-16 | 2014-09-18 | Mitsubishi Electric Corp | Drive power supply for vehicle |
-
1992
- 1992-02-17 JP JP2870392A patent/JPH05227744A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013243927A (en) * | 2013-07-04 | 2013-12-05 | Mitsubishi Electric Corp | Drive electric power supply device for vehicle |
| JP2014171385A (en) * | 2014-04-16 | 2014-09-18 | Mitsubishi Electric Corp | Drive power supply for vehicle |
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