JPH1172522A - Method and apparatus for detection deterioration of capacitor - Google Patents
Method and apparatus for detection deterioration of capacitorInfo
- Publication number
- JPH1172522A JPH1172522A JP9234686A JP23468697A JPH1172522A JP H1172522 A JPH1172522 A JP H1172522A JP 9234686 A JP9234686 A JP 9234686A JP 23468697 A JP23468697 A JP 23468697A JP H1172522 A JPH1172522 A JP H1172522A
- Authority
- JP
- Japan
- Prior art keywords
- capacitor
- output
- voltage
- converter
- terminals
- 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
Links
Landscapes
- Power Conversion In General (AREA)
- Inverter Devices (AREA)
- Testing Electric Properties And Detecting Electric Faults (AREA)
- Rectifiers (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、電源装置の平滑用
コンデンサの劣化を検出するコンデンサ劣化検出方法及
び装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a capacitor deterioration detecting method and apparatus for detecting deterioration of a smoothing capacitor of a power supply device.
【０００２】[0002]
【従来の技術】従来、電源装置の平滑用コンデンサの劣
化を検出する装置として、例えば特開平７−２２２４３
６号公報に示されているものがある。この公報に示され
た検出装置は、図３に示すように、平滑用コンデンサ４
のリプル電圧あるいはリプル電流を検出し、その検出し
たリプル電圧あるいはリプル電流と所定の寿命判定レベ
ル電圧、電流とを比較器７にて比較し、その比較結果に
基づいて平滑用コンデンサ４の寿命を判定するようにし
たものである。2. Description of the Related Art Conventionally, as a device for detecting deterioration of a smoothing capacitor of a power supply device, for example, JP-A-7-22243
No. 6 discloses this. As shown in FIG. 3, the detecting device disclosed in this publication includes a smoothing capacitor 4
, And the detected ripple voltage or ripple current is compared with a predetermined life determination level voltage and current by the comparator 7, and the life of the smoothing capacitor 4 is determined based on the comparison result. This is to determine.
【０００３】[0003]
【発明が解決しようとする課題】ところで、上述した従
来のコンデンサ劣化検出装置にあっては、リプル電圧、
あるいは電流の量を検出し、その量と所定の寿命判定レ
ベル電圧あるいは電流とを比較するものであることか
ら、当然ながら回路構成はアナログ的になり、このため
個々の部品の集積化が困難で、装置の小型化には限界が
あった。そこで本発明は、アナログ的な構成では実現で
きない装置の小型化を図ることができるコンデンサ劣化
検出方法及び装置を提供することを目的としている。By the way, in the conventional capacitor deterioration detecting device described above, the ripple voltage,
Alternatively, since the amount of current is detected, and the amount is compared with a predetermined life determination level voltage or current, the circuit configuration is of course analog and thus it is difficult to integrate individual components. However, there has been a limit to miniaturization of the apparatus. Therefore, an object of the present invention is to provide a capacitor deterioration detection method and apparatus capable of reducing the size of a device that cannot be realized by an analog configuration.
【０００４】[0004]
【課題を解決するための手段】請求項１記載の発明によ
るコンデンサ劣化検出方法は、整流出力を平滑化するコ
ンデンサの端子間電圧をデジタル変換し、前記端子間電
圧の微小時間毎の変化の割合から前記コンデンサの容量
の低下を判定するものである。この方法によれば、コン
デンサの劣化検出をデジタル的な構成で実現できるの
で、個々の部品の集積化が容易になり、装置の小型化を
実現できる。請求項２記載のコンデンサ劣化検出装置
は、整流出力を平滑化するコンデンサの端子間電圧をデ
ジタル変換するＡ／Ｄコンバータと、前記Ａ／Ｄコンバ
ータの出力より前記コンデンサの端子間電圧の微小時間
毎の変化の割合を求め、その変化の割合が所定レベルを
超える場合に警報出力を送出する判定手段とを備えるも
のである。コンデンサの劣化を検出するには負荷を接続
して電流を流す必要があるので、負荷がない場合にはコ
ンデンサと並列に直流出力端間にスイッチ素子と負荷抵
抗を介挿し、コンデンサの劣化検出時にスイッチ素子を
オンして負荷抵抗に電流を流すようにする。According to a first aspect of the present invention, there is provided a method for detecting deterioration of a capacitor, comprising: converting a voltage between terminals of a capacitor for smoothing a rectified output into a digital signal; Is used to determine a decrease in the capacity of the capacitor. According to this method, deterioration detection of the capacitor can be realized by a digital configuration, so that individual components can be easily integrated and the device can be downsized. An A / D converter for digitally converting a voltage between terminals of a capacitor for smoothing a rectified output, and an output of the A / D converter for every minute time of a voltage between terminals of the capacitor from the output of the A / D converter. And a determination means for sending out an alarm output when the rate of change exceeds a predetermined level. To detect deterioration of the capacitor, it is necessary to connect a load and pass current.If there is no load, insert a switch element and a load resistor between the DC output terminals in parallel with the capacitor. The switch element is turned on so that a current flows through the load resistor.
【０００５】[0005]
【発明の実施の形態】以下、本発明の実施の形態を図面
を参照して説明する。図１は本発明によるコンデンサ劣
化検出装置の実施の形態の構成を示すブロック図であ
る。この実施の形態のコンデンサ劣化検出装置は、モー
タに電力を供給する電源装置に用いたものであり、Ａ／
Ｄコンバータ１０と、このＡ／Ｄコンバータ１０の出力
に基づいて平滑用のコンデンサ１４の劣化を判定する判
定回路１１と、ＮＰＮ型のトランジスタ１２と、負荷抵
抗１３とを備えている。Ａ／Ｄコンバータ１０は、ブリ
ッジ回路１５の整流出力を平滑するコンデンサ１４の端
子間電圧をデジタル変換する。トランジスタ１２は、そ
のコレクタが負荷抵抗１３を介して直流出力の正極側に
接続されており、エミッタが直流出力の負側に接続され
ている。ベースには判定回路１１から制御信号が入力さ
れる。判定回路１１はコンデンサ１４の劣化状態を判定
する際にトランジスタ１２に制御信号を入力してオン状
態にし、負荷抵抗１３に電流を流す。その時の直流出力
は図２に示すようになる。回路に負荷抵抗１３が入るこ
とで、交流時の最大値から負荷抵抗１３による放電で低
下した値となるリプル分が現れ、このリプル分の傾きは
コンデンサ１４の容量によって決まることは周知であ
る。そして、この傾きはＡ／Ｄコンバータ１０でサンプ
リングすることで求めることができる。この場合、交流
５０Ｈｚではピーク値からピーク値（Peak-to-peak）へ
の時間は１０ｍｓｅｃであり、傾きはコンデンサ１４の
容量が全く零の５ｍｓｅｃから１０ｍｓｅｃまでの間で
サンプリングすれば良い。したがって、Ａ／Ｄコンバー
タ１０としては、サンプリングレートが５０μｓｅｃの
物でも最低１００回程度のサンプリングが可能であり、
十分に傾きを求めることができる。判定回路１１は、元
々図２のＳの様な傾きであったコンデンサ１４がＦのよ
うな傾きになると、劣化したと判断して警報信号（ＡＬ
Ｍ）を出力する。判定回路１１は、コンデンサ１４の劣
化検出処理をトランジスタブリッジ１７の各トランジス
タが全てオフになった時に行った場合に、検出処理後は
直ちにトランジスタ１２をオフして通常の動作を行う。
通常の動作では、負荷であるモータ１６の回生電圧が戻
ってくる際にトランジスタ１２をオンし、負荷抵抗１３
を入れて電圧を低下させることで回生電圧を抑制する。
このように、この実施の形態では、ブリッジ回路１５の
出力を平滑するコンデンサ１４の端子間電圧をデジタル
変換するＡ／Ｄコンバータ１０と、このＡ／Ｄコンバー
タ１０の出力に基づいて平滑用のコンデンサ１４の劣化
を判定する判定回路１１とを備え、コンデンサ１４の端
子間電圧を微小時間毎に計測し、直流出力の電圧変動の
傾きからコンデンサ１４の劣化を検出するようにしたの
で、コンデンサの劣化検出をデジタル的な構成（例えば
ＡＳＩＣに搭載する）で実現でき、アナログ的な構成で
は実現できない装置の小型化を図ることができる。ま
た、この実施の形態では、負荷抵抗１３およびトランジ
スタ１２を回生抑制用としても兼用できるので、回路の
簡素化が図れるという利点も有している。なお、この実
施の形態では、コンデンサ１４の劣化を検出した時に警
報信号を出力するだけであったが、ブザーまたはランプ
（ＬＥＤを含む）等を設けて、動作させるようにしても
良い。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a configuration of an embodiment of a capacitor deterioration detecting device according to the present invention. The capacitor deterioration detecting device according to the present embodiment is used for a power supply device for supplying electric power to a motor.
It includes a D converter 10, a determination circuit 11 for determining the deterioration of the smoothing capacitor 14 based on the output of the A / D converter 10, an NPN transistor 12, and a load resistor 13. The A / D converter 10 converts the voltage between terminals of the capacitor 14 for smoothing the rectified output of the bridge circuit 15 into a digital signal. The transistor 12 has a collector connected to the positive side of the DC output via the load resistor 13 and an emitter connected to the negative side of the DC output. A control signal is input from the determination circuit 11 to the base. When determining the deterioration state of the capacitor 14, the determination circuit 11 inputs a control signal to the transistor 12 to turn it on, and causes a current to flow through the load resistor 13. The DC output at that time is as shown in FIG. It is well known that when the load resistor 13 enters the circuit, a ripple component having a value reduced by the discharge from the load resistor 13 from the maximum value at the time of alternating current appears, and the gradient of the ripple component is determined by the capacitance of the capacitor 14. This inclination can be obtained by sampling with the A / D converter 10. In this case, at 50 Hz AC, the time from the peak value to the peak value (Peak-to-peak) is 10 msec, and the slope may be sampled between 5 msec and 10 msec when the capacitance of the capacitor 14 is completely zero. Therefore, the A / D converter 10 can sample at least about 100 times even if the sampling rate is 50 μsec.
The inclination can be obtained sufficiently. The judgment circuit 11 judges that the capacitor 14 has deteriorated when the capacitor 14 originally had a slope like S in FIG.
M). When the deterioration detection processing of the capacitor 14 is performed when all the transistors of the transistor bridge 17 are turned off, the determination circuit 11 turns off the transistor 12 immediately after the detection processing to perform a normal operation.
In normal operation, when the regenerative voltage of the motor 16 as a load returns, the transistor 12 is turned on and the load resistance 13
To suppress the regenerative voltage by lowering the voltage.
As described above, in this embodiment, the A / D converter 10 that digitally converts the voltage between terminals of the capacitor 14 that smoothes the output of the bridge circuit 15, and the smoothing capacitor based on the output of the A / D converter 10. And a judgment circuit 11 for judging the deterioration of the capacitor 14. The voltage between the terminals of the capacitor 14 is measured every minute time, and the deterioration of the capacitor 14 is detected from the gradient of the voltage fluctuation of the DC output. Detection can be realized with a digital configuration (for example, mounted on an ASIC), and the size of the device that cannot be realized with an analog configuration can be reduced. Further, in this embodiment, the load resistor 13 and the transistor 12 can also be used for suppressing regeneration, so that there is an advantage that the circuit can be simplified. In this embodiment, an alarm signal is only output when the deterioration of the capacitor 14 is detected. However, a buzzer or a lamp (including an LED) may be provided for operation.
【０００６】[0006]
【発明の効果】以上説明したように、本発明によれば、
コンデンサの劣化検出をデジタル的な構成で実現でき、
アナログ的な構成では実現できない装置の小型化を図る
ことができる。As described above, according to the present invention,
Capacitor deterioration detection can be realized with a digital configuration,
A device that cannot be realized with an analog configuration can be reduced in size.
【図１】本発明に係るコンデンサ劣化検出装置の実施の
形態の構成を示すブロック図である。FIG. 1 is a block diagram showing a configuration of an embodiment of a capacitor deterioration detection device according to the present invention.
【図２】同実施の形態の動作を説明するための図であ
る。FIG. 2 is a diagram for explaining the operation of the embodiment.
【図３】従来のコンデンサ劣化検出装置の構成を示すブ
ロック図である。FIG. 3 is a block diagram showing a configuration of a conventional capacitor deterioration detection device.
１０ Ａ／Ｄコンバータ １１ 判定回路 １２ トランジスタ １３ 負荷抵抗 １４ 平滑用コンデンサ １５ ブリッジ回路 １６ モータ １７ トランジスタブリッジ回路 Reference Signs List 10 A / D converter 11 Judgment circuit 12 Transistor 13 Load resistance 14 Smoothing capacitor 15 Bridge circuit 16 Motor 17 Transistor bridge circuit
Claims (3)
間電圧をデジタル変換し、前記端子間電圧の微小時間毎
の変化の割合から前記コンデンサの容量の低下を判定す
ることを特徴とするコンデンサ劣化検出方法。1. A capacitor deterioration, wherein a voltage between terminals of a capacitor for smoothing a rectified output is converted into a digital signal, and a decrease in the capacitance of the capacitor is determined based on a rate of change of the terminal voltage every minute time. Detection method.
間電圧をデジタル変換するＡ／Ｄコンバータと、 前記Ａ／Ｄコンバータの出力より前記コンデンサの端子
間電圧の微小時間毎の変化の割合を求め、その変化の割
合が所定レベルを超える場合に警報出力を送出する判定
手段とを具備したことを特徴とするコンデンサ劣化検出
装置。2. An A / D converter for digitally converting a voltage between terminals of a capacitor for smoothing a rectified output, and a rate of change of a voltage between terminals of the capacitor every minute time is obtained from an output of the A / D converter. Determining means for sending an alarm output when the rate of change exceeds a predetermined level.
端間に介挿され、直列接続されたスイッチ素子及び負荷
抵抗を備え、 前記判定手段が、無負荷時に前記スイッチ素子をオン状
態にして前記負荷抵抗に負荷電流を流し、その後、前記
Ａ／Ｄコンバータの出力より前記コンデンサの端子間電
圧の微小時間毎の変化の割合を求めることを特徴とする
請求項２記載のコンデンサ劣化検出装置。3. A switch element and a load resistor interposed between the DC output terminals in parallel with the capacitor and connected in series with each other, wherein the determining means turns on the switch element when no load is applied, and 3. The capacitor deterioration detecting device according to claim 2, wherein a load current is passed through a load resistor, and thereafter, a rate of change of a voltage between terminals of the capacitor every minute time is obtained from an output of the A / D converter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23468697A JP3940857B2 (en) | 1997-08-29 | 1997-08-29 | Capacitor degradation detection method and apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23468697A JP3940857B2 (en) | 1997-08-29 | 1997-08-29 | Capacitor degradation detection method and apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH1172522A true JPH1172522A (en) | 1999-03-16 |
| JP3940857B2 JP3940857B2 (en) | 2007-07-04 |
Family
ID=16974854
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP23468697A Expired - Fee Related JP3940857B2 (en) | 1997-08-29 | 1997-08-29 | Capacitor degradation detection method and apparatus |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3940857B2 (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009288221A (en) * | 2008-06-02 | 2009-12-10 | Mitsubishi Electric Corp | Condenser degradation detection device and home electric appliances |
| US7746617B2 (en) | 2006-04-19 | 2010-06-29 | Mitsubishi Electric Corporation | Overload relay and operating method thereof |
| JP2010160001A (en) * | 2009-01-07 | 2010-07-22 | Fuji Electric Systems Co Ltd | Capacitance calculator and degradation detector of main circuit capacitor |
| JP2011188649A (en) * | 2010-03-09 | 2011-09-22 | Omron Corp | Switching power supply |
| JP5340476B2 (en) * | 2010-03-11 | 2013-11-13 | 三菱電機株式会社 | Power converter |
| JP2014023180A (en) * | 2012-07-12 | 2014-02-03 | Toyota Industries Corp | Control device for inverter |
| EP2660962A3 (en) * | 2012-04-30 | 2017-12-06 | Rockwell Automation Technologies, Inc. | Filter capacitor degradation detection apparatus and method |
-
1997
- 1997-08-29 JP JP23468697A patent/JP3940857B2/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7746617B2 (en) | 2006-04-19 | 2010-06-29 | Mitsubishi Electric Corporation | Overload relay and operating method thereof |
| JP2009288221A (en) * | 2008-06-02 | 2009-12-10 | Mitsubishi Electric Corp | Condenser degradation detection device and home electric appliances |
| JP2010160001A (en) * | 2009-01-07 | 2010-07-22 | Fuji Electric Systems Co Ltd | Capacitance calculator and degradation detector of main circuit capacitor |
| JP2011188649A (en) * | 2010-03-09 | 2011-09-22 | Omron Corp | Switching power supply |
| JP5340476B2 (en) * | 2010-03-11 | 2013-11-13 | 三菱電機株式会社 | Power converter |
| EP2660962A3 (en) * | 2012-04-30 | 2017-12-06 | Rockwell Automation Technologies, Inc. | Filter capacitor degradation detection apparatus and method |
| JP2014023180A (en) * | 2012-07-12 | 2014-02-03 | Toyota Industries Corp | Control device for inverter |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3940857B2 (en) | 2007-07-04 |
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