JPH05215800A - Method for diagnosing deterioration of capacitor - Google Patents
Method for diagnosing deterioration of capacitorInfo
- Publication number
- JPH05215800A JPH05215800A JP4019073A JP1907392A JPH05215800A JP H05215800 A JPH05215800 A JP H05215800A JP 4019073 A JP4019073 A JP 4019073A JP 1907392 A JP1907392 A JP 1907392A JP H05215800 A JPH05215800 A JP H05215800A
- Authority
- JP
- Japan
- Prior art keywords
- capacitor
- voltage
- battery
- time
- electrolytic capacitor
- 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.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/40—Testing power supplies
- G01R31/42—AC power supplies
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/64—Testing of capacitors
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Resistance Or Impedance (AREA)
- Testing Electric Properties And Detecting Electric Faults (AREA)
- Time Recorders, Dirve Recorders, Access Control (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明はコンデンサの劣化診断方
法に係り、詳しくはバッテリを電源とした電力変換装置
の入力部に使用される電解コンデンサの劣化診断方法に
関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of diagnosing deterioration of a capacitor, and more particularly to a method of diagnosing deterioration of an electrolytic capacitor used in an input section of a power converter using a battery as a power source.
【０００２】[0002]
【従来の技術】インバータ、チョッパ装置等の電力変換
装置では電源とパワートランジスタ部との間に、パワー
トランジスタ部のスイッチング素子がターンオフする際
に配線インダクタンスの影響で発生するサージ電圧を抑
えて電圧を安定化する役割を果たすコンデンサが並列に
接続されている。このコンデンサには通常電解コンデン
サが使用されるが、電解コンデンサは他の電子部品に比
べて寿命が短い。そして、電解コンデンサが寿命末期に
なると、その静電容量が減少してスイッチング素子の両
端にかかるサージ電圧が大きくなり、放置するとスイッ
チング素子に過電圧が印加されて破壊する場合がある。2. Description of the Related Art In a power conversion device such as an inverter or a chopper device, a surge voltage generated between a power source and a power transistor part due to the influence of wiring inductance when a switching element of the power transistor part is turned off is suppressed to reduce the voltage. Capacitors that serve to stabilize are connected in parallel. An electrolytic capacitor is usually used for this capacitor, but the electrolytic capacitor has a shorter life than other electronic components. Then, at the end of the life of the electrolytic capacitor, its electrostatic capacity decreases, and the surge voltage applied to both ends of the switching element increases, and if left unattended, an overvoltage may be applied to the switching element to destroy it.
【０００３】電解コンデンサの劣化による前記の不都合
を防止するため、例えば、図４に示すように３相交流電
源２０を電源とし、コンバータ部２１で整流した電圧を
コンデンサ２２で安定させてパワートランジスタ部２３
へ印加し、パワートランジスタ部２３を図示しない駆動
回路で制御してモータＭを駆動する装置の場合のコンデ
ンサ２２の劣化診断方法として、特開平３−２２８２１
号公報にはスイッチＳＷ１を投入後、コンデンサ２２の
電圧が所定電圧になるまでの時間を測定し、それを基準
値と比較する方法が開示されている。この方法は、スイ
ッチＳＷ１投入後のコンデンサ２２の電圧上昇時間が抵
抗Ｒの値とコンデンサ２２の容量値との積に比例する
が、コンデンサ２２が劣化して容量値が小さくなると上
昇時間が短くなることを利用している。In order to prevent the above-mentioned inconvenience due to the deterioration of the electrolytic capacitor, for example, as shown in FIG. 4, a three-phase AC power source 20 is used as a power source, the voltage rectified by the converter unit 21 is stabilized by the capacitor 22, and the power transistor unit is provided. 23
As a method of diagnosing the deterioration of the capacitor 22 in the case of a device that drives the motor M by controlling the power transistor unit 23 by a drive circuit (not shown), the method of diagnosing deterioration of the capacitor 22 is disclosed in Japanese Patent Laid-Open No. 3-22821
The publication discloses a method of measuring the time until the voltage of the capacitor 22 reaches a predetermined voltage after the switch SW1 is turned on and comparing it with a reference value. In this method, the voltage rise time of the capacitor 22 after the switch SW1 is turned on is proportional to the product of the value of the resistor R and the capacitance value of the capacitor 22, but if the capacitor 22 deteriorates and the capacitance value decreases, the rise time becomes shorter. I'm taking advantage of that.
【０００４】[0004]
【発明が解決しようとする課題】前記の方法は電圧が一
定の商用電源の場合には問題はない。しかし、電源がバ
ッテリであるバッテリフォークリフト、電気自動車等の
場合は、電源電圧がバッテリの放電率によって変化する
ため、コンデンサの電圧が所定電圧になるまでの時間を
単に基準値と比較するだけでは、コンデンサの良否を正
確に判定できない場合がある。The above method has no problem in the case of a commercial power source having a constant voltage. However, in the case of a battery forklift truck whose power source is a battery, an electric vehicle, etc., since the power source voltage changes depending on the discharge rate of the battery, simply comparing the time until the voltage of the capacitor reaches a predetermined voltage with a reference value, In some cases, the quality of the capacitor cannot be accurately determined.
【０００５】本発明は前記の問題点に鑑みてなされたも
のであって、その目的はバッテリを電源とした電力変換
装置の入力部に使用されるコンデンサの劣化を正確に判
断することができるコンデンサの劣化診断方法を提供す
ることにある。The present invention has been made in view of the above problems, and an object thereof is to make it possible to accurately determine deterioration of a capacitor used in an input section of a power conversion device using a battery as a power source. It is to provide a method of diagnosing deterioration.
【０００６】[0006]
【課題を解決するための手段】前記の目的を達成するた
め本発明では、電源バッテリと該バッテリから電圧が印
加される電力変換装置との間に配置されたコンデンサの
劣化診断方法において、電源スイッチ投入から抵抗を介
して充電されるコンデンサ電圧が所定電圧に到達するま
での充電時間を測定し、その充電時間をコンデンサが正
常な状態で当該充電時間測定時のバッテリ電圧のときに
コンデンサ電圧が前記所定電圧に到達するまでの基準時
間と比較し、充電時間が基準時間より短いときにコンデ
ンサの劣化と判定するようにした。In order to achieve the above object, the present invention provides a method for diagnosing deterioration of a capacitor arranged between a power supply battery and a power conversion device to which a voltage is applied from the battery, and a power switch. Measure the charging time from the time when the capacitor voltage charged through the resistor reaches the specified voltage, and then measure the charging time with the capacitor voltage in Compared with the reference time until reaching a predetermined voltage, when the charging time is shorter than the reference time, it is determined that the capacitor is deteriorated.
【０００７】[0007]
【作用】電源スイッチ投入から抵抗を介して充電される
コンデンサ電圧が所定電圧に到達するまでの充電時間が
測定される。そして、正常なコンデンサの場合に前記所
定電圧まで充電するのに必要な基準時間と前記充電時間
とが比較され、充電時間が基準時間より短いときにコン
デンサの劣化と判定される。コンデンサが正常であって
も電源電圧が変化すると所定電圧に達するまでの充電時
間も変化する。電源がバッテリであると、バッテリの放
電により電源電圧が変化する。しかし、基準時間が当該
充電時間測定時のバッテリ電圧を基準として設定される
ため、電源電圧が変化しても、コンデンサの劣化診断に
支障を来さない。The charging time from when the power switch is turned on to when the capacitor voltage charged through the resistor reaches a predetermined voltage is measured. Then, in the case of a normal capacitor, the reference time required for charging to the predetermined voltage is compared with the charging time, and when the charging time is shorter than the reference time, it is determined that the capacitor is deteriorated. Even if the capacitor is normal, if the power supply voltage changes, the charging time until it reaches a predetermined voltage also changes. When the power source is a battery, the power source voltage changes due to discharge of the battery. However, since the reference time is set with reference to the battery voltage at the time of measuring the charging time, even if the power supply voltage changes, the deterioration diagnosis of the capacitor is not hindered.
【０００８】[0008]
【実施例】以下、本発明を具体化した一実施例を図１〜
図３に従って説明する。図２に示すように電源としての
バッテリ１が電力変換装置としてのパワートランジスタ
部２に接続され、パワートランジスタ部２にモータ３が
接続されている。パワートランジスタ部２は直流を任意
の周波数の交流に変換する。バッテリ１とパワートラン
ジスタ部２との間には第１のスイッチＳＷ１及び抵抗４
が直列に接続され、抵抗４に対して並列に第２のスイッ
チＳＷ２が接続されている。又、パワートランジスタ部
２に対して並列に電解コンデンサ５が接続されている。
両スイッチＳＷ１，ＳＷ２は図示しない制御装置により
オン、オフ制御されるようになっている。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment embodying the present invention will now be described with reference to FIGS.
It will be described with reference to FIG. As shown in FIG. 2, a battery 1 as a power source is connected to a power transistor unit 2 as a power converter, and a motor 3 is connected to the power transistor unit 2. The power transistor unit 2 converts direct current into alternating current having an arbitrary frequency. A first switch SW1 and a resistor 4 are provided between the battery 1 and the power transistor unit 2.
Are connected in series, and the second switch SW2 is connected in parallel to the resistor 4. An electrolytic capacitor 5 is connected in parallel with the power transistor unit 2.
Both switches SW1 and SW2 are controlled to be turned on and off by a control device (not shown).
【０００９】抵抗４と電解コンデンサ５との間には電解
コンデンサ５の端子電圧すなわち充電電圧を検出する電
圧検出部６が接続されている。電解コンデンサ５の劣化
の有無を診断する診断装置７には第１のスイッチＳＷ１
の投入信号と、電圧検出部６の出力信号とが入力される
ようになっている。診断装置７は図示しないＣＰＵ（中
央処理装置）及び記憶装置を備え、第１のスイッチＳＷ
１の投入時から、電解コンデンサ５の電圧が所定電圧Ｖ
scに到達するまでの充電時間ｔc と、正常なコンデンサ
の場合に前記所定電圧Ｖscまで充電するのに必要な基準
時間ｔs とを比較し、充電時間ｔc が基準時間ｔs より
短いときにコンデンサの劣化と判定するようになってい
る。所定電圧Ｖscはバッテリ１がその交換を必要とする
電圧まで放電した時の値より若干小さな値に設定され、
記憶装置に記憶されている。A voltage detector 6 for detecting the terminal voltage of the electrolytic capacitor 5, that is, the charging voltage is connected between the resistor 4 and the electrolytic capacitor 5. The diagnostic device 7 for diagnosing the deterioration of the electrolytic capacitor 5 includes a first switch SW1.
Input signal and the output signal of the voltage detection unit 6 are input. The diagnostic device 7 includes a CPU (central processing unit) and a storage device (not shown), and includes a first switch SW.
Since the time of turning on 1, the voltage of the electrolytic capacitor 5 is the predetermined voltage V
The charging time tc until reaching sc is compared with the reference time ts required for charging to the predetermined voltage Vsc in the case of a normal capacitor, and when the charging time tc is shorter than the reference time ts, deterioration of the capacitor Is determined. The predetermined voltage Vsc is set to a value slightly smaller than the value when the battery 1 is discharged to a voltage that requires replacement,
It is stored in the storage device.
【００１０】次に前記のように構成された装置の作用を
説明する。第１のスイッチＳＷ１が投入されると、電解
コンデンサ５は抵抗４を介して充電が開始される。診断
装置７は第１のスイッチＳＷ１が投入されると、電圧検
出部６からの信号を入力して電解コンデンサ５の端子電
圧を測定する。又、診断装置７は第１のスイッチＳＷ１
の投入と同時に経過時間を計測する。そして、電解コン
デンサ５の端子電圧が所定電圧Ｖscに到達すると、それ
までかかった充電時間ｔc をメモリに一時記憶する。Next, the operation of the device configured as described above will be described. When the first switch SW1 is turned on, the electrolytic capacitor 5 starts charging via the resistor 4. When the first switch SW1 is turned on, the diagnostic device 7 inputs the signal from the voltage detection unit 6 and measures the terminal voltage of the electrolytic capacitor 5. In addition, the diagnostic device 7 has a first switch SW1.
The elapsed time is measured at the same time when the is input. Then, when the terminal voltage of the electrolytic capacitor 5 reaches the predetermined voltage Vsc, the charging time tc taken until then is temporarily stored in the memory.
【００１１】電解コンデンサ５の静電容量をＣ、抵抗４
の抵抗値をＲ、第１のスイッチＳＷ１投入からの経過時
間をｔとすると、電解コンデンサ５の端子電圧Ｖｃとバ
ッテリ電圧Ｖ0 との間には次式が成り立つ。The capacitance of the electrolytic capacitor 5 is C, and the resistance 4
Where R is the resistance value and t is the time elapsed from the first switch SW1 being turned on, the following equation holds between the terminal voltage Vc of the electrolytic capacitor 5 and the battery voltage V0.
【００１２】[0012]
【数１】 [Equation 1]
【００１３】すなわち、電解コンデンサ５の端子電圧の
上昇は時間に単純に比例するのではなく、図３に示すよ
うに電解コンデンサ５の静電容量Ｃ及び抵抗４の抵抗値
Ｒによって定まる指数関数的に増加する。That is, the rise in the terminal voltage of the electrolytic capacitor 5 is not simply proportional to time, but is exponentially determined by the electrostatic capacitance C of the electrolytic capacitor 5 and the resistance value R of the resistor 4 as shown in FIG. Increase to.
【００１４】診断装置７は電解コンデンサ５の電圧が所
定電圧Ｖscよりさらに上昇し、電解コンデンサ５の電圧
が一定になったことを確認した後、基準時間ｔs を算出
する。電解コンデンサ５の電圧が一定になったことの確
認は、例えば電圧検出部６から同じ電圧値の信号が１０
回続いた場合とする。このときの電解コンデンサ５の電
圧はバッテリ１の電圧Ｖ0 に等しいと見なせる。そし
て、診断装置７は電解コンデンサ５が正常な状態で前記
バッテリ電圧Ｖ0 のときに、電解コンデンサ５を前記所
定電圧Ｖscまで充電するのに必要な時間すなわち基準時
間ｔs を、前記の式に基づいて算出する。The diagnostic device 7 calculates the reference time ts after confirming that the voltage of the electrolytic capacitor 5 further rises above the predetermined voltage Vsc and the voltage of the electrolytic capacitor 5 becomes constant. To confirm that the voltage of the electrolytic capacitor 5 has become constant, for example, a signal of the same voltage value from the voltage detection unit 6 is detected.
Suppose it has been repeated several times. It can be considered that the voltage of the electrolytic capacitor 5 at this time is equal to the voltage V0 of the battery 1. When the electrolytic capacitor 5 is in the normal state and the battery voltage is V0, the diagnostic device 7 determines the time required to charge the electrolytic capacitor 5 to the predetermined voltage Vsc, that is, the reference time ts, based on the above equation. calculate.
【００１５】そして、診断装置７はその基準時間ｔs と
前記記憶装置に記憶した充電時間ｔc とを比較し、充電
時間ｔc が基準時間ｔs より短い場合に電解コンデンサ
５が劣化していると判断する。この場合、診断装置７は
パワートランジスタ部２等を制御する制御装置（図示せ
ず）に、電解コンデンサ５の劣化を知らせる信号を出力
するとともに、図示しない表示部にその旨を表示した
り、警告ランプを点灯する。制御装置は前記信号を入力
すると、パワートランジスタ部２の駆動を行わない。Then, the diagnostic device 7 compares the reference time ts with the charging time tc stored in the storage device, and judges that the electrolytic capacitor 5 is deteriorated when the charging time tc is shorter than the reference time ts. .. In this case, the diagnostic device 7 outputs a signal notifying the deterioration of the electrolytic capacitor 5 to a control device (not shown) that controls the power transistor unit 2 and the like, and also displays that fact on a display unit (not shown) and gives a warning. Turn on the lamp. When the control device receives the signal, it does not drive the power transistor unit 2.
【００１６】前記のように電解コンデンサ５の劣化の有
無を判定する基準時間ｔs として常に一定の値が使用さ
れるのではなく、電解コンデンサ５の充電時間測定時の
バッテリ電圧に対応した値が使用される。従って、バッ
テリ１の放電によりバッテリ電圧が変化しても、電解コ
ンデンサ５の劣化を常に正確に判定できる。As described above, a constant value is not always used as the reference time ts for determining the presence or absence of deterioration of the electrolytic capacitor 5, but a value corresponding to the battery voltage when the charging time of the electrolytic capacitor 5 is measured is used. To be done. Therefore, even if the battery voltage changes due to discharge of the battery 1, the deterioration of the electrolytic capacitor 5 can always be accurately determined.
【００１７】一方、充電時間ｔc が基準時間ｔs 以上で
あれば、診断装置７は電解コンデンサ５が正常であると
判断する。この場合は、第２のスイッチＳＷ２が閉じら
れ、パワートランジスタ部２がバッテリ１と直結され
る。そして、制御装置によりパワートランジスタ部２が
駆動制御される。なお、第１のスイッチＳＷ１の投入時
に電解コンデンサ５とバッテリ１とを直結せずに抵抗４
を介して充電するのは、突入電流が電解コンデンサ５に
流れるのを防止するためである。On the other hand, if the charging time tc is longer than the reference time ts, the diagnostic device 7 determines that the electrolytic capacitor 5 is normal. In this case, the second switch SW2 is closed and the power transistor unit 2 is directly connected to the battery 1. Then, the control device drives and controls the power transistor unit 2. In addition, when the first switch SW1 is turned on, the electrolytic capacitor 5 and the battery 1 are not directly connected to each other and the resistor 4
The reason for charging via the capacitor is to prevent an inrush current from flowing into the electrolytic capacitor 5.
【００１８】なお、本発明は前記実施例に限定されるも
のではなく、例えば、充電時間ｔcが基準時間ｔs より
短いとき、単に電解コンデンサ５の劣化と診断するだけ
でなく、基準時間ｔs との差を表示し、直ちに交換が必
要か否かの参考資料とするようにしてもよい。又、電解
コンデンサ５の電圧から充電時間測定時のバッテリ１の
電圧Ｖ0 を求める代わりに、バッテリ１の電圧Ｖ0 を直
接測定してもよい。The present invention is not limited to the above-described embodiment. For example, when the charging time tc is shorter than the reference time ts, not only the deterioration of the electrolytic capacitor 5 is diagnosed but also the reference time ts. The difference may be displayed, and may be used as a reference material for whether or not immediate replacement is necessary. Further, instead of obtaining the voltage V0 of the battery 1 when measuring the charging time from the voltage of the electrolytic capacitor 5, the voltage V0 of the battery 1 may be directly measured.
【００１９】[0019]
【発明の効果】以上詳述したように本発明によれば、バ
ッテリを電源とした電力変換装置の入力部に使用される
コンデンサの劣化をバッテリ電圧が変化しても正確に判
断することができるので、コンデンサの劣化を知らずに
電力変換装置を運転することによる電力変換装置の破損
等の二次故障の発生を確実に防止することができ、トラ
ブルを最小限に食い止めることができる。As described above in detail, according to the present invention, it is possible to accurately determine the deterioration of the capacitor used in the input section of the power conversion device using the battery as the power supply even if the battery voltage changes. Therefore, it is possible to reliably prevent the occurrence of a secondary failure such as damage to the power conversion device by operating the power conversion device without knowing the deterioration of the capacitor, and it is possible to minimize the trouble.
【図１】診断装置の作用を示すフローチャートである。FIG. 1 is a flowchart showing an operation of a diagnostic device.
【図２】本発明を具体化するための構成を示すブロック
図である。FIG. 2 is a block diagram showing a configuration for embodying the present invention.
【図３】電源投入後の電解コンデンサの端子電圧の変化
を示す線図である。FIG. 3 is a diagram showing a change in terminal voltage of an electrolytic capacitor after power is turned on.
【図４】電源、スイッチ、電力変換装置、コンデンサ等
の接続状態を示すブロック回路図である。FIG. 4 is a block circuit diagram showing a connection state of a power supply, a switch, a power conversion device, a capacitor and the like.
１…バッテリ、２…電力変換装置としてのパワートラン
ジスタ部、４…抵抗、５…電解コンデンサ、６…電圧検
出部、７……診断装置、ＳＷ１…電源スイッチとしての
第１のスイッチ。DESCRIPTION OF SYMBOLS 1 ... Battery, 2 ... Power transistor part as a power converter device, 4 ... Resistor, 5 ... Electrolytic capacitor, 6 ... Voltage detection part, 7 ... Diagnostic device, SW1 ... 1st switch as a power switch.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 須賀 健治 愛知県刈谷市豊田町２丁目１番地 株式会 社豊田自動織機製作所内 (72)発明者 飛田 淳一 愛知県刈谷市豊田町２丁目１番地 株式会 社豊田自動織機製作所内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Kenji Suga, Kenji Suga, 2-chome, Toyota-cho, Kariya-shi, Aichi Stock company, Toyota Industries Corporation (72) Inventor, Junichi Tobita 2-chome, Toyota-cho, Kariya-shi, Aichi Stock Company Toyota Loom Works
Claims (1)
加される電力変換装置との間に配置されたコンデンサの
劣化診断方法であって、電源スイッチ投入から抵抗を介
して充電されるコンデンサ電圧が所定電圧に到達するま
での充電時間を測定し、その充電時間をコンデンサが正
常な状態で当該充電時間測定時のバッテリ電圧のときに
コンデンサ電圧が前記所定電圧に到達するまでの基準時
間と比較し、充電時間が基準時間より短いときにコンデ
ンサの劣化と判定するコンデンサの劣化診断方法。1. A method for diagnosing deterioration of a capacitor arranged between a power supply battery and a power conversion device to which a voltage is applied from the battery, wherein a capacitor voltage charged through a resistor after a power switch is turned on is predetermined. The charging time until reaching the voltage is measured, and the charging time is compared with the reference time until the capacitor voltage reaches the predetermined voltage at the battery voltage at the time of the charging time measurement in the normal state of the capacitor, A method for diagnosing deterioration of a capacitor that determines that the capacitor has deteriorated when the charging time is shorter than the reference time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4019073A JPH05215800A (en) | 1992-02-04 | 1992-02-04 | Method for diagnosing deterioration of capacitor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4019073A JPH05215800A (en) | 1992-02-04 | 1992-02-04 | Method for diagnosing deterioration of capacitor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05215800A true JPH05215800A (en) | 1993-08-24 |
Family
ID=11989264
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4019073A Pending JPH05215800A (en) | 1992-02-04 | 1992-02-04 | Method for diagnosing deterioration of capacitor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05215800A (en) |
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|---|---|---|---|---|
| EP0652445A2 (en) * | 1993-11-08 | 1995-05-10 | Honda Giken Kogyo Kabushiki Kaisha | Apparatus for inspecting electric components for inverter circuit |
| EP2470919A1 (en) * | 2009-08-27 | 2012-07-04 | Analog Devices, Inc. | System and method for measuring capacitance |
| EP2682769A1 (en) * | 2012-07-02 | 2014-01-08 | LSIS Co., Ltd. | Apparatus for diagnosing DC link capacitor of inverter |
| JP2016059181A (en) * | 2014-09-10 | 2016-04-21 | ファナック株式会社 | Pwm rectifier with electrostatic capacity calculation part |
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| JP2019168392A (en) * | 2018-03-26 | 2019-10-03 | ラピスセミコンダクタ株式会社 | Semiconductor device and electronic apparatus |
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-
1992
- 1992-02-04 JP JP4019073A patent/JPH05215800A/en active Pending
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|---|---|---|---|---|
| US5497095A (en) * | 1993-11-08 | 1996-03-05 | Honda Giken Kogyo Kabushiki Kaisha | Apparatus for inspecting electric component for inverter circuit |
| EP0652445A3 (en) * | 1993-11-08 | 1996-03-27 | Honda Motor Co Ltd | Apparatus for inspecting electric components for inverter circuit. |
| US5694051A (en) * | 1993-11-08 | 1997-12-02 | Honda Giken Kogyo Kabushiki Kaisha | Inspecting transistors in an inverter circuit |
| US5798648A (en) * | 1993-11-08 | 1998-08-25 | Honda Giken Kogyo Kabushiki Kaisha | Apparatus and method for inspecting an electrolytic capacitor in an inverter circuit containing transistor switching elements |
| EP1326085A2 (en) * | 1993-11-08 | 2003-07-09 | Honda Giken Kogyo Kabushiki Kaisha | Apparatus for inspecting electric component for inverter circuit |
| EP1326085A3 (en) * | 1993-11-08 | 2007-11-14 | Honda Giken Kogyo Kabushiki Kaisha | Apparatus for inspecting electric component for inverter circuit |
| EP0652445A2 (en) * | 1993-11-08 | 1995-05-10 | Honda Giken Kogyo Kabushiki Kaisha | Apparatus for inspecting electric components for inverter circuit |
| EP2470919A4 (en) * | 2009-08-27 | 2014-12-31 | Analog Devices Inc | System and method for measuring capacitance |
| EP2470919A1 (en) * | 2009-08-27 | 2012-07-04 | Analog Devices, Inc. | System and method for measuring capacitance |
| US9535107B2 (en) | 2012-07-02 | 2017-01-03 | Lsis Co., Ltd. | Apparatus for diagnosing DC link capacitor of inverter |
| EP2682769A1 (en) * | 2012-07-02 | 2014-01-08 | LSIS Co., Ltd. | Apparatus for diagnosing DC link capacitor of inverter |
| US9923477B2 (en) | 2014-09-10 | 2018-03-20 | Fanuc Corporation | PWM rectifier including capacitance calculation unit |
| JP2016059181A (en) * | 2014-09-10 | 2016-04-21 | ファナック株式会社 | Pwm rectifier with electrostatic capacity calculation part |
| DE102015224819B4 (en) | 2014-12-15 | 2019-12-05 | Denso Corporation | Hochdruckeinspritzersteuerung |
| JP2016113955A (en) * | 2014-12-15 | 2016-06-23 | 株式会社デンソー | High-pressure injector controller |
| CN111033281A (en) * | 2017-08-24 | 2020-04-17 | 株式会社富士 | Capacitor charging performance monitoring system for production machine |
| EP3674718A4 (en) * | 2017-08-24 | 2020-08-19 | Fuji Corporation | Capacitor charging performance monitoring system of production machine |
| US11215680B2 (en) | 2017-08-24 | 2022-01-04 | Fuji Corporation | Capacitor charging performance monitoring system of production machine |
| JP2019045307A (en) * | 2017-09-01 | 2019-03-22 | 株式会社Ihi | Line noise testing device |
| JP2019045335A (en) * | 2017-09-04 | 2019-03-22 | Ｎｅｃエナジーデバイス株式会社 | Detection device, system, control method, and program |
| JP2019106847A (en) * | 2017-12-14 | 2019-06-27 | 株式会社日立製作所 | Wireless terminal, system including wireless terminal, and electronic device |
| JP2019168392A (en) * | 2018-03-26 | 2019-10-03 | ラピスセミコンダクタ株式会社 | Semiconductor device and electronic apparatus |
| KR102019243B1 (en) * | 2018-07-20 | 2019-09-06 | 최운선 | Capacitor state detection circuit and method using charging and discharging of precharge circuit |
| WO2022209975A1 (en) * | 2021-04-02 | 2022-10-06 | 株式会社デンソー | Deterioration determination device and power conversion device |
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