JP2006226917A - Withstand voltage testing instrument and disconnection detector - Google Patents
Withstand voltage testing instrument and disconnection detector Download PDFInfo
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- JP2006226917A JP2006226917A JP2005043094A JP2005043094A JP2006226917A JP 2006226917 A JP2006226917 A JP 2006226917A JP 2005043094 A JP2005043094 A JP 2005043094A JP 2005043094 A JP2005043094 A JP 2005043094A JP 2006226917 A JP2006226917 A JP 2006226917A
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Abstract
Description
本発明は電気機器の電源部の絶縁耐圧性を検査する装置に関する。 The present invention relates to an apparatus for inspecting withstand voltage resistance of a power supply unit of an electric device.
製造した電気機器(特に電源部)は、耐圧性(絶縁性)を試験する必要がある。パソコン等の一般ユーザが使用する電子機器は、通常AC100Vの商用電源を用い(一次側)、電子回路等はDC5V等(二次側)の低い電圧を使用する。この一次側の高電圧に触ると感電の危険があるため、この電圧が二次側に漏れないことを確認する。すなわち、一次二次間に高電圧を印加し、絶縁が確保されていることを確認する必要がある。 It is necessary to test the pressure resistance (insulating properties) of the manufactured electrical equipment (particularly the power supply unit). Electronic devices used by general users such as personal computers usually use a commercial power supply of 100 VAC (primary side), and electronic circuits use a low voltage such as 5 VDC (secondary side). Touching the high voltage on the primary side may cause an electric shock, so make sure that this voltage does not leak to the secondary side. That is, it is necessary to confirm that insulation is secured by applying a high voltage between the primary and secondary.
通常の耐圧試験器は、電気機器の一次側および二次側の試験端子に接続可能にした、端部に接続具(コネクタ、クリップ等)をそれぞれ設けた一対のプローブ、両プローブの他端部に接続され高電圧を出力する高圧電源部、両試験端子間を流れる漏れ電流を検出する電流検出部、検出された電流値を表示するか又は異常検出を表示する表示部、および高圧電源部の出力電圧や表示部による電流値の表示を制御する制御部を備える。 A normal withstand voltage tester is a pair of probes each provided with a connector (connector, clip, etc.) at the end, which can be connected to the primary and secondary test terminals of the electrical equipment, and the other end of both probes. A high-voltage power supply unit that outputs a high voltage connected to the current detection unit, a current detection unit that detects a leakage current flowing between both test terminals, a display unit that displays a detected current value or anomaly detection, and a high-voltage power supply unit A control unit that controls display of the output voltage and the current value by the display unit is provided.
耐圧試験器を用いて電気機器の耐圧試験を行う際の状態を図1に示す。まず、電気機器における一対の試験端子に両プローブをそれぞれ接続する。図において試験対象の電源ユニット1の一次側入力端子に耐圧試験器2のプローブ3aを、二次側出力端子に他のプローブ3bを接続する。
FIG. 1 shows a state when a withstand voltage test of an electric device is performed using a withstand voltage tester. First, both probes are respectively connected to a pair of test terminals in the electrical equipment. In the figure, the probe 3a of the
次に、耐圧試験器の電源部から耐圧試験用高電圧を出力させる。耐圧試験用電圧が両プローブを介して両試験端子に印加されているときの両試験端子間を流れる電流を検出する。絶縁が悪い場合は漏洩電流が流れる。電流検出部によって検出した電流値は表示部に表示される。又は、漏洩電流が所定値以上であることを判定するとアラームとしてランプ表示等をおこなう。 Next, a high voltage for a withstand voltage test is output from the power supply unit of the withstand voltage tester. A current flowing between both test terminals is detected when a voltage for withstand voltage test is applied to both test terminals via both probes. Leakage current flows when insulation is poor. The current value detected by the current detection unit is displayed on the display unit. Alternatively, when it is determined that the leakage current is a predetermined value or more, a lamp display or the like is performed as an alarm.
試験担当者(あるいは自動判定装置)は、表示された電流値が所定のしきい値以下のとき、又はアラームが点かないときには試験対象の電気機器を合格品と判定し、電流値がしきい値を超えているときやアラームがあるときには不合格品と判定する。 The person in charge of the test (or automatic determination device) determines that the electrical device to be tested is a pass product when the displayed current value is below a predetermined threshold value or when no alarm is activated, and the current value is a threshold value. If it exceeds the limit or there is an alarm, it will be judged as a rejected product.
しかし、プローブは、使用の際のケーブルの曲げストレスや経年変化による接点やケーブルの劣化により断線することがある。その場合には、電気機器の両試験端子に電圧が印加されないため電流が流れず、本来不合格になるものも合格と判定することになる。 However, the probe may be disconnected due to deterioration of the contact point or cable due to bending stress or aging of the cable during use. In that case, since no voltage is applied to both test terminals of the electrical equipment, no current flows, and those that are originally rejected are also determined to be acceptable.
この問題点を解決する技術として、プローブ(ライン)の断線チェック(断線検査)が可能な耐圧試験器の技術が開示されている。これにより完全な断線の場合は検出できる。
以上のような耐圧試験によるストレス印可を検出し、電源ユニットのフィールド障害を予防することである。 This is to detect the application of stress by the withstand voltage test as described above to prevent a field failure of the power supply unit.
通常、耐圧試験の印加電圧は1500V程度、周波数は商用電源と同じ50Hz〜60Hzである。 Usually, the applied voltage in the withstand voltage test is about 1500 V, and the frequency is 50 Hz to 60 Hz, which is the same as the commercial power supply.
図1に示すように、試験対象の一次側入力端子を短絡した状態でプローブの一端を接続し、試験対象の二次側出力の端子を短絡した状態でプローブの他端を接続する。従って、この間に高圧をかけても電源ユニットのトランスの一次・二次等の絶縁部にかかるだけでダイオード等の回路部品にかかることはない。 As shown in FIG. 1, one end of the probe is connected in a state where the primary input terminal to be tested is short-circuited, and the other end of the probe is connected in a state where the secondary output terminal to be tested is short-circuited. Therefore, even if a high voltage is applied during this period, it is applied only to the primary / secondary insulating parts of the transformer of the power supply unit, and does not apply to circuit components such as diodes.
耐圧試験時の異常によるストレス印加メカニズムは以下のとおりである。 The stress application mechanism due to abnormality during the pressure test is as follows.
長期の使用や操作の誤りによりプローブの配線の断線しかかりやコネクタの接触不良が起こる。すると試験中に断線部や接触不良箇所で放電が起こり高周波(〜数kHz程度)の電圧変化が発生する。するとトランスや回路の結合容量や浮遊容量を介して瞬間的であるが部品に高電圧がかかる。図2(a)にこのようなときのプローブ間印可波形を示す。図2(b)は、二次側のダイオード4にかかる電圧波形の例である。このようにしてストレスが印加され、その場で破壊しなくても劣化を起こし、故障しやすくなる。 Long-term use or operation errors can cause the probe wiring to break or poor connector contact. Then, during the test, a discharge occurs at the disconnection portion or the contact failure portion, and a high-frequency (about several kHz) voltage change occurs. Then, a high voltage is applied to the component instantaneously through the coupling capacitance and stray capacitance of the transformer and circuit. FIG. 2 (a) shows a waveform applied between probes at such a time. FIG. 2B is an example of a voltage waveform applied to the secondary-side diode 4. In this way, stress is applied, and even if it is not destroyed on the spot, it is deteriorated and easily broken.
従来の耐圧試験器は、漏れ電流を監視して所定の値以上のとき異常と判定する。しかし、断線しかかりや接触不良のとき、瞬間漏れ電流は増加するが平均電流はそれほど変化しない。従って従来の耐圧試験器の検出機能は動作しない。 The conventional withstand voltage tester monitors the leakage current and determines that it is abnormal when it exceeds a predetermined value. However, when the wire breaks or the contact is poor, the instantaneous leakage current increases but the average current does not change so much. Therefore, the detection function of the conventional pressure tester does not operate.
耐圧試験異常時の漏れ電流波形を図3に示す。これによると、異常時の漏れ電流波形のピーク電流の値はバラツキが大であるのに対し、高周波電流の発生はバラツキが小さい。すなわち高周波電流を電気回路で検出すれば異常検出が可能であることが分かった。 FIG. 3 shows a leakage current waveform when the withstand voltage test is abnormal. According to this, the value of the peak current of the leakage current waveform at the time of abnormality has a large variation, while the generation of the high-frequency current has a small variation. That is, it has been found that an abnormality can be detected if a high-frequency current is detected by an electric circuit.
従って、耐圧試験器のプローブに装着され、プローブに流れる電流変化を検出する検出部と、検出部の出力から所定の周波数範囲の信号を取り出すフィルタ部と、フィルタ出力と所定値との比較により異常値を検出し保持する比較部と、比較部の状態に従って表示を行う表示部とを有する断線検出器として構成する。また、比較部が所定の値以上の電圧を検出したとき、検出結果を記録する記録部を有するように構成し、異常発生を確実に捉える。 Therefore, a detection unit that is attached to the probe of the withstand voltage tester and detects a change in the current flowing through the probe, a filter unit that extracts a signal in a predetermined frequency range from the output of the detection unit, and an abnormality caused by comparing the filter output with a predetermined value It is configured as a disconnection detector having a comparison unit that detects and holds a value and a display unit that performs display according to the state of the comparison unit. Further, when the comparison unit detects a voltage equal to or higher than a predetermined value, it is configured to have a recording unit that records the detection result, so that the occurrence of an abnormality is reliably caught.
耐圧試験時に、試験対象機器に対するストレス印可があったことを確実に検出することによって、稼働後の電源不良をなくすことができる。 By reliably detecting that a stress has been applied to the test target device during the pressure resistance test, it is possible to eliminate power failure after operation.
(実施例1)
図4に断線検出器を付加した耐圧試験装置の構成例を示す。本図では従来の耐圧試験器のプローブに断線検出器を付加する形の構成を示す。もちろん断線検出器を備えた耐圧試験装置として構成してもよい。
Example 1
FIG. 4 shows a configuration example of a withstand voltage test apparatus to which a disconnection detector is added. This figure shows a configuration in which a disconnection detector is added to a probe of a conventional pressure tester. Of course, you may comprise as a pressure | voltage resistant test apparatus provided with the disconnection detector.
断線検出器は耐圧試験器のプローブ3aに流れる電流の変化を捉える検出部11、その出力から1kHz程度の信号を取り出すフィルタとレベルを調整する回路を備えたフィルタ部12、その出力を所定のしきい値と比較して大であるとき保持する比較部13、その結果を表示又は記録する表示部14を備える。
The disconnection detector has a detection unit 11 that captures a change in the current flowing through the probe 3a of the withstand voltage tester, a filter that extracts a signal of about 1 kHz from its output, and a
図5に断線検出器の回路構成例を示す。 FIG. 5 shows a circuit configuration example of the disconnection detector.
検出部11は、プローブに流れる数kHz程度の電流変化を検出できるものであればよい。フィルタ部12は商用周波数とノイズ成分とを除去し検出レベルの調整を行う回路である。比較部13は信号を増幅し所定値との比較により異常値を検出すると保持する回路である。異常値が検出されると比較部の発光ダイオードにより表示する。なお、異常値が検出されると保持されるため、リセットスイッチでリセットしないかぎりは発光ダイオードによる表示は保持される。従って、操作の誤りや試験装置(プローブコネクタ)劣化等の一時的異常も見逃さず検出できる。
The detection unit 11 only needs to be capable of detecting a change in current of about several kHz flowing through the probe. The
また、耐圧試験も含めた自動試験装置として試験結果を記録する装置の一部とし、断線状態の発生を記録するように構成することも容易である。 It is also easy to configure the automatic test apparatus including the pressure resistance test as a part of the apparatus for recording the test result so as to record the occurrence of the disconnection state.
1 試験対象機器(の電源回路)
2 耐圧試験器
3a プローブ
3b プローブ
4 ダイオード
10 断線検出器
11 検出部
12 フィルタ部
13 比較部
14 表示部
1 Equipment to be tested (power circuit)
2 Voltage
Claims (3)
検出部の出力から所定の周波数範囲の信号を取り出すフィルタ部と、
フィルタ出力と所定値との比較により異常値を検出し保持する比較部と、
比較部の状態に従って表示を行う表示部と
を有する断線検出器。 A detector that is attached to the probe of the pressure tester and detects a change in current flowing through the probe;
A filter unit for extracting a signal in a predetermined frequency range from the output of the detection unit;
A comparison unit that detects and holds an abnormal value by comparing the filter output with a predetermined value;
The disconnection detector which has a display part which displays according to the state of a comparison part.
比較部が所定の値以上の電圧を検出したとき、検出結果を記録する記録部を有する
ことを特徴とする断線検出器。 The disconnection detector according to claim 1,
A disconnection detector, comprising: a recording unit that records a detection result when the comparison unit detects a voltage of a predetermined value or more.
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2020026958A (en) * | 2018-08-09 | 2020-02-20 | 日置電機株式会社 | measuring device |
CN111693823A (en) * | 2019-03-11 | 2020-09-22 | 张民基 | Withstand voltage testing device |
Citations (3)
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JPH03218222A (en) * | 1990-01-23 | 1991-09-25 | Daiichi Denki Kk | Faulty contact detector |
JPH06130118A (en) * | 1992-10-13 | 1994-05-13 | Daikin Ind Ltd | Dielectric strength tester |
JP2000002737A (en) * | 1998-06-17 | 2000-01-07 | Sumitomo Constr Mach Co Ltd | Electric wiring connection abnormality detecting device of construction machinery |
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2005
- 2005-02-18 JP JP2005043094A patent/JP2006226917A/en active Pending
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH03218222A (en) * | 1990-01-23 | 1991-09-25 | Daiichi Denki Kk | Faulty contact detector |
JPH06130118A (en) * | 1992-10-13 | 1994-05-13 | Daikin Ind Ltd | Dielectric strength tester |
JP2000002737A (en) * | 1998-06-17 | 2000-01-07 | Sumitomo Constr Mach Co Ltd | Electric wiring connection abnormality detecting device of construction machinery |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2020026958A (en) * | 2018-08-09 | 2020-02-20 | 日置電機株式会社 | measuring device |
JP7166836B2 (en) | 2018-08-09 | 2022-11-08 | 日置電機株式会社 | measuring device |
CN111693823A (en) * | 2019-03-11 | 2020-09-22 | 张民基 | Withstand voltage testing device |
CN111693823B (en) * | 2019-03-11 | 2024-04-16 | 张民基 | Withstand voltage testing arrangement |
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