JP2012085425A - Cord short-circuit detection circuit and outlet device - Google Patents

Cord short-circuit detection circuit and outlet device Download PDF

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JP2012085425A
JP2012085425A JP2010228869A JP2010228869A JP2012085425A JP 2012085425 A JP2012085425 A JP 2012085425A JP 2010228869 A JP2010228869 A JP 2010228869A JP 2010228869 A JP2010228869 A JP 2010228869A JP 2012085425 A JP2012085425 A JP 2012085425A
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circuit
voltage
cord
short
cord short
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JP5587127B2 (en
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Atsushi Yoshida
敦至 吉田
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Kawamura Electric Inc
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Kawamura Electric Inc
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Abstract

PROBLEM TO BE SOLVED: To provide a cord short-circuit detection circuit capable of detecting a short circuit at a whisker cord based on change in a cable way voltage, and to provide an outlet device capable of cutting off the cable way when a whisker cord short-circuit occurs.SOLUTION: The cord short-circuit detection circuit includes a power source and detection circuit 14a which detects a voltage of a cable way L to which a load 4 is connected, and outputs a first voltage available by making an absolute value from a voltage waveform of the cable way L based on the detected voltage information and a second voltage available by making a DC from the voltage waveform of the cable way L, and a determination circuit 14b which compares the first voltage with the second voltage, and determines occurrence of a cord short-circuit if the relationship between them satisfies a predetermined condition. The second voltage is set to be almost half the peak value of the first voltage. The determination circuit 14b determines that a cord short-circuit has occurred if such cable way condition occurs as the peak value of the first voltage does not reach the second voltage.

Description

本発明は、コード短絡を検出するコード短絡検知回路、及びコード短絡が発生したら電路を遮断する機能を備えたコンセント装置に関する。   The present invention relates to a cord short-circuit detection circuit for detecting a cord short-circuit, and an outlet device having a function of interrupting an electric circuit when a cord short-circuit occurs.

従来より、接続された差込プラグと負荷の間の電路上でコード短絡が発生したらそれを検知して電路を遮断する機能を備えたコンセント装置がある。例えば特許文献1では、電路上に設けた抵抗素子で電路電流を検出し、この電流値が所定の値を越えたらコード短絡発生と判断してトリップコイルをトリップさせて電路を遮断操作している。   2. Description of the Related Art Conventionally, there is an outlet device having a function of detecting an occurrence of a short-circuiting of a cord on an electric path between a connected plug and a load and interrupting the electric circuit. For example, in Patent Document 1, an electric circuit current is detected by a resistance element provided on an electric circuit, and when the current value exceeds a predetermined value, it is determined that a cord short circuit has occurred, and the trip coil is tripped to cut off the electric circuit. .

特開2005−6380号公報JP 2005-6380 A

電気機器による火災要因では電線の短絡が最も多く、その要因にコード短絡が挙げられている。このコード短絡の場合、最初は撚り線1本程度のヒゲコード短絡からスタートすると見ることができるため、このヒゲコード短絡を精度良く検出する回路が求められている。
しかし、ヒゲコード短絡では、数百アンペアの電流は流れず、半サイクル或いはそれ以下の短い時間で電線焼損に至る。この場合、過電流、突入電流との相違点抽出も極めて困難であるため、電路電流で判断する上記特許文献1の構成では、ヒゲコード短絡を確実に検出することが出来なかった。
The most common cause of fire caused by electrical equipment is short-circuiting of wires, and the reason for this is short-circuiting of cords. In the case of this cord short-circuit, it can be seen that the beard cord short-circuit starts with about one stranded wire at first, and therefore a circuit for accurately detecting the beard cord short-circuit is required.
However, with a beard cord short-circuit, a current of several hundred amperes does not flow, and the wire is burned out in a short time of a half cycle or less. In this case, since it is extremely difficult to extract the difference between the overcurrent and the inrush current, the configuration of the above-described Patent Document 1 in which the determination is made based on the circuit current cannot reliably detect the whisker code short circuit.

そこで、本発明はこのような問題点に鑑み、電路電流ではなく電路電圧を監視することでヒゲコード短絡の検出を可能とするもので、ヒゲコード短絡を検知するコード短絡検知回路、及びヒゲコード短絡が発生したら電路を遮断するコンセント装置を提供することを目的としている。   Therefore, in view of such a problem, the present invention enables detection of a mustache cord short circuit by monitoring the circuit voltage instead of the circuit current, and a cord short circuit detection circuit for detecting a mustache cord short circuit, and a mustache code short circuit occurs. The purpose is to provide an outlet device that cuts off the electric circuit.

上記課題を解決する為に、請求項1の発明に係るコード短絡検知回路は、負荷へ電力を供給する電路の電圧情報を入手する電圧情報入手回路と、検出した電圧情報からコード短絡を判定する判定回路とを有し、前記電圧情報入手回路は、入手した電圧情報から電路の電圧波形を絶対値化した第1の電圧と電路の電圧波形を直流化した第2の電圧とを出力し、前記判定回路は、前記第1の電圧と前記第2の電圧とを比較して、両者の関係が所定の条件を満たしたらコード短絡発生と判定することを特徴とする。
この構成によれば、電流変化に依らず電路電圧の波形変化からコード短絡を検出するため、負荷の突入電流や過負荷による大電流を考慮する必要が無くなり、ヒゲコード短絡を検出することが可能となる。
In order to solve the above problems, a cord short-circuit detection circuit according to the invention of claim 1 determines a cord short-circuit from a voltage information acquisition circuit that obtains voltage information of an electric circuit that supplies power to a load, and the detected voltage information. The voltage information acquisition circuit outputs a first voltage obtained by converting the voltage waveform of the electric circuit into an absolute value from the obtained voltage information and a second voltage obtained by converting the voltage waveform of the electric circuit into a direct current, The determination circuit compares the first voltage and the second voltage, and determines that a cord short-circuit has occurred when a relationship between the two satisfies a predetermined condition.
According to this configuration, the cord short circuit is detected from the change in the waveform of the circuit voltage regardless of the current change, so that it is not necessary to consider a large current due to an inrush current of the load or an overload, and it is possible to detect a mustache cord short circuit. Become.

請求項2の発明は、請求項1に記載の構成において、電路が平常な状態において、前記第1の電圧の波形ピーク値に対して前記第2の電圧は特定の比率になるよう設定され、前記判定回路は、前記第1の電圧のピーク値が前記第2の電圧に達しない電路状態が発生したら、コード短絡発生と判定することを特徴とする。
この構成によれば、電圧波形を絶対値化したピーク値の大きさで判断するため、半周期程度の電圧波形の変化で検出することができ、撚り線1本程度のヒゲコード短絡による電圧降下を検出することが可能となる。
According to a second aspect of the present invention, in the configuration according to the first aspect, the second voltage is set to have a specific ratio with respect to the waveform peak value of the first voltage in a normal state of the electric circuit, The determination circuit determines that a cord short circuit has occurred when an electric circuit state occurs in which a peak value of the first voltage does not reach the second voltage.
According to this configuration, since the voltage waveform is determined based on the magnitude of the peak value, it can be detected by a change in the voltage waveform of about a half cycle, and a voltage drop due to a beard cord short circuit of about one stranded wire can be detected. It becomes possible to detect.

請求項3の発明は、請求項2に記載の構成において、前記第2の電圧は、前記第1の電圧のピーク値に対して略2分の1の大きさであることを特徴とする。
この構成によれば、負荷の突入電流や過負荷による電圧降下を排除して、コード短絡のみを確実に検出することができる。
According to a third aspect of the present invention, in the configuration of the second aspect, the second voltage is approximately half the magnitude of the peak value of the first voltage.
According to this configuration, it is possible to reliably detect only a cord short circuit by eliminating a voltage drop due to an inrush current of a load or an overload.

請求項4の発明は、請求項2又は3に記載の構成において、前記判定回路の出力を平均化する平均値回路と、前記平均値回路の出力を反転する反転回路とを有し、前記判定回路は、前記第1の電圧のピーク値が前記第2の電圧を越えたら電圧信号を出力し、前記反転回路の出力をコード短絡発生を通知する信号としたことを特徴とする。
この構成によれば、反転回路を設けることで判定回路を簡易な回路で構成できる。そして、平均値回路によりノイズのない安定した信号を出力できる。
According to a fourth aspect of the present invention, in the configuration according to the second or third aspect, the determination circuit includes an average value circuit that averages an output of the determination circuit, and an inverting circuit that inverts an output of the average value circuit. The circuit is characterized in that when the peak value of the first voltage exceeds the second voltage, a voltage signal is output, and the output of the inverting circuit is a signal for notifying the occurrence of a code short circuit.
According to this configuration, the determination circuit can be configured with a simple circuit by providing the inverting circuit. The average value circuit can output a stable signal free from noise.

請求項5の発明に係るコンセント装置は、負荷が連結された電源プラグを接続するコンセントと、前記コンセントに商用電力を供給するための電路と、前記電路上に設けた開閉手段と、前記開閉手段を開操作するトリップコイルと、請求項1乃至4の何れかに記載のコード短絡検知回路とを有し、前記コード短絡検知回路がコード短絡を検出したら、前記トリップコイルがトリップ動作して電路を遮断することを特徴とする。
この構成によれば、ヒゲコード短絡が発生したらそれを検知してコンセント出力を停止するので、コード短絡による火災発生を確実に防止できる。
According to a fifth aspect of the present invention, there is provided an outlet device for connecting an outlet connected to a power plug, an electric circuit for supplying commercial power to the outlet, an opening / closing unit provided on the electric circuit, and the opening / closing unit. And a cord short circuit detection circuit according to any one of claims 1 to 4, and when the cord short circuit detection circuit detects a cord short circuit, the trip coil trips and opens the electric circuit. It is characterized by blocking.
According to this configuration, when a mustache cord short-circuit occurs, it is detected and the outlet output is stopped, so that it is possible to reliably prevent the occurrence of a fire due to the cord short-circuit.

本発明のコード短絡検知回路によれば、電流変化に依らず電路電圧の波形変化からコード短絡を検出するため、負荷の突入電流や過負荷による大電流を考慮する必要が無くなり、撚り線1本程度のヒゲコード短絡による電圧降下を検出することができる。
また、本発明のコンセント装置によれば、ヒゲコード短絡が発生したらそれを検知してコンセント出力を停止する。よって、コード短絡による火災発生を確実に防止できる。
According to the cord short circuit detection circuit of the present invention, since the cord short circuit is detected from the change in the waveform of the circuit voltage regardless of the current change, it is not necessary to consider the inrush current of the load or the large current due to overload, and one stranded wire. A voltage drop due to a short beard code short circuit can be detected.
Further, according to the outlet device of the present invention, when a whisker cord short circuit occurs, it is detected and the outlet output is stopped. Therefore, it is possible to reliably prevent a fire due to a cord short circuit.

本発明に係るコンセント装置の一例を示す回路図である。It is a circuit diagram which shows an example of the outlet apparatus which concerns on this invention. 図1のコード短絡検知回路の要部波形図であり、(a)は判定回路の入力波形、(b)は判定回路の出力波形、(c)は平均値回路の出力波形を示している。2 is a waveform diagram of a main part of the cord short-circuit detection circuit of FIG. 1, where (a) shows an input waveform of the determination circuit, (b) shows an output waveform of the determination circuit, and (c) shows an output waveform of the average value circuit.

以下、本発明を具体化した実施の形態を、図面に基づいて詳細に説明する。図1は本発明に係るコンセント装置の一例を示す回路図である。図1において、1はコンセント装置、2は商用電源、3は分岐ブレーカ、4はテレビや暖房器具等の負荷、5はコード短絡発生場所、Lは負荷4に至る電路を示し、壁面に埋設設置される構成のコンセント装置を示している。   DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, embodiments of the invention will be described in detail with reference to the drawings. FIG. 1 is a circuit diagram showing an example of an outlet device according to the present invention. In FIG. 1, 1 is an outlet device, 2 is a commercial power source, 3 is a branch breaker, 4 is a load such as a television or a heating appliance, 5 is a place where a cord short-circuit occurs, L is an electric circuit leading to the load 4, and is embedded in a wall It shows the outlet device of the configuration.

コンセント装置1は、コンセント10、電路Lを遮断して負荷4への電力の供給を停止するための接点11、接点11を開操作する電磁コイルから成るトリップコイル12、トリップコイル12をトリップ動作させる駆動回路13、コード短絡を検出するコード短絡検知回路14を備えている。   The outlet device 1 trips the outlet 10, the contact 11 for cutting off the electric circuit L and stopping the supply of power to the load 4, the trip coil 12 including an electromagnetic coil for opening the contact 11, and the trip coil 12. A drive circuit 13 and a cord short circuit detection circuit 14 for detecting a cord short circuit are provided.

コード短絡検知回路14は、電路電圧を監視するために電路電圧を検出し、個々の回路に電源を供給するための電源・検出回路14aと、コード短絡発生を判定する判定回路14bと、判定回路14bの出力を安定化させるための平均値回路14cと、平均値回路14cの出力を反転する反転回路14dとで構成されている。反転回路14dの出力はトリップコイル12を動作させるための駆動回路13に接続されている。   The cord short circuit detection circuit 14 detects a circuit voltage in order to monitor the circuit voltage, supplies a power to each circuit, a power detection circuit 14a, a determination circuit 14b for determining the occurrence of a code short circuit, and a determination circuit An average value circuit 14c for stabilizing the output of 14b and an inverting circuit 14d for inverting the output of the average value circuit 14c are configured. The output of the inverting circuit 14d is connected to a drive circuit 13 for operating the trip coil 12.

具体的に、電源・検出回路14aは、電路Lの電圧波形を整流して絶対値化する全波整流回路20と、整流した電圧波形情報から判定回路14bに出力する第1の電圧を生成する第1出力回路21と、整流した電圧波形からリップルを削減して直流を生成し、判定回路14bに出力する第2の電圧を生成する第2出力回路22とを備えている。具体的に、第1の電圧の電圧波形ピーク値に対して、第2の電圧の直流電圧は略2分の1の電圧値になるよう設定されている。   Specifically, the power supply / detection circuit 14a generates a first wave output to the determination circuit 14b from the full-wave rectification circuit 20 that rectifies the voltage waveform of the electric circuit L to an absolute value and the rectified voltage waveform information. A first output circuit 21 and a second output circuit 22 that generates a second voltage to be output to the determination circuit 14b by generating a direct current by reducing ripples from the rectified voltage waveform. Specifically, the DC voltage of the second voltage is set to be approximately one half of the voltage waveform peak value of the first voltage.

判定回路14bはOPアンプA1を有し、電源・検出回路14aが出力する第1の電圧と第2の電圧とを比較し、第1の電圧が第2の電圧より大きい場合に電圧信号を出力する。   The determination circuit 14b has an OP amplifier A1, compares the first voltage output from the power supply / detection circuit 14a with the second voltage, and outputs a voltage signal when the first voltage is higher than the second voltage. To do.

平均値回路14cはOPアンプA2を有し、判定回路14bの出力を平滑化して安定させる。判定回路14bは電路Lが正常な間は電圧半周期毎に信号を出力するため、この出力を平滑化させる。   The average value circuit 14c has an OP amplifier A2, and smoothes and stabilizes the output of the determination circuit 14b. Since the determination circuit 14b outputs a signal every voltage half cycle while the electric circuit L is normal, the output is smoothed.

反転回路14dは、IC化したNOT回路A3を出力部に有し、コード短絡発生時のみ電圧信号を出力させる。コード短絡が発生すると、大きな電圧降下が発生して第1の電圧が第2の電圧に達しない状態になるため、判定回路14bは電圧信号を出力しなくなる。即ち、コード短絡が発生すると、判定回路14bの出力は停止する。そのため、反転回路14dにより、コード短絡発生時に電圧信号を出力させる。   The inverting circuit 14d has an integrated NOT circuit A3 as an output section, and outputs a voltage signal only when a code short circuit occurs. When the cord short-circuit occurs, a large voltage drop occurs and the first voltage does not reach the second voltage, so that the determination circuit 14b does not output a voltage signal. That is, when the code short circuit occurs, the output of the determination circuit 14b stops. Therefore, the voltage signal is output by the inverting circuit 14d when the code short circuit occurs.

そして、駆動回路13は、反転回路14dの出力を受けて起動し、トリップコイル12をトリップ動作させる。この結果、接点11は開動作し、負荷4への電力の供給は停止される。   Then, the drive circuit 13 is activated in response to the output of the inverting circuit 14d and causes the trip coil 12 to perform a trip operation. As a result, the contact 11 opens and the supply of power to the load 4 is stopped.

尚、判定回路14bや平均値回路14c等に組み込まれているOPアンプA1,A2やNOT回路A3は、電源・検出回路14aに図示しない電源回路が設けられ、この電源回路から電源の供給を受けている。   Note that the OP amplifiers A1 and A2 and the NOT circuit A3 incorporated in the determination circuit 14b, the average value circuit 14c, and the like are provided with a power supply circuit (not shown) in the power supply / detection circuit 14a, and receive power supply from the power supply circuit. ing.

このように構成されたコード短絡検知回路14及びコンセント装置1の動作を具体的に説明する。まず、コード短絡の発生のない正常な状態では、反転回路14dの出力に電圧信号は発生せず、コード短絡検知回路14は信号を出力しない。
図2はこの正常状態でのコード短絡検知回路14の要部波形図を示し、(a)は判定回路14bの入力波形図、(b)は判定回路14bの出力波形図、(c)は平均値回路14cの出力波形図を示している。正常状態では、電源・検出回路14aの第1出力回路21の出力電圧波形S1と第2出力回路22の出力電圧波形S2は図2(a)に示す関係を維持する。即ち、電圧波形半周期毎に波形S1が波形S2を越えるため、判定回路14bは商用周波数の2倍の周波数となる一定の間隔の矩形波を出力し、平均値回路14cの出力は一定電圧の信号となる。その結果、反転回路14dの出力は電圧信号を出力せず、駆動回路13が動作することはない。
The operation of the cord short circuit detection circuit 14 and the outlet device 1 configured as described above will be specifically described. First, in a normal state where no code short circuit occurs, a voltage signal is not generated at the output of the inverting circuit 14d, and the code short circuit detection circuit 14 does not output a signal.
2A and 2B are waveform diagrams of the main part of the cord short-circuit detection circuit 14 in the normal state, where FIG. 2A is an input waveform diagram of the determination circuit 14b, FIG. 2B is an output waveform diagram of the determination circuit 14b, and FIG. An output waveform diagram of the value circuit 14c is shown. In the normal state, the output voltage waveform S1 of the first output circuit 21 of the power supply / detection circuit 14a and the output voltage waveform S2 of the second output circuit 22 maintain the relationship shown in FIG. That is, since the waveform S1 exceeds the waveform S2 every half cycle of the voltage waveform, the determination circuit 14b outputs a rectangular wave having a constant interval that is twice the commercial frequency, and the output of the average value circuit 14c has a constant voltage. Signal. As a result, the output of the inverting circuit 14d does not output a voltage signal, and the drive circuit 13 does not operate.

次にコード短絡が発生した場合を説明する。通常、電路電圧はAC100Vであるが、図1に示すようにコンセント装置1と負荷4の間の電路Lでコード短絡が発生すると、短絡点では0Vに近い電圧となるため、コンセント装置1においても大きな電圧降下を生じ、ピーク値は正常時の50%を大きく下回る状態が発生する。このような大きな電圧降下は、負荷起動時や突入電流によって発生することが無く、コード短絡を良好に判別できる。尚、コード短絡がヒゲコード短絡の場合、電圧降下の発生時間は短く、半サイクル程度で発生する。   Next, a case where a cord short circuit occurs will be described. Normally, the circuit voltage is AC100V. However, when a short circuit occurs in the circuit L between the outlet device 1 and the load 4 as shown in FIG. A large voltage drop occurs, and the peak value is much lower than 50% of the normal value. Such a large voltage drop does not occur at the time of starting the load or due to an inrush current, so that the cord short-circuit can be well distinguished. When the cord short circuit is a whisker code short circuit, the voltage drop occurs for a short time and occurs in about half a cycle.

このような特徴を示す電圧波形が検出されたら、コード短絡発生回路14の電源・検出回路14aでは、第1の電圧である電圧波形のピーク値が通常の50%に満たない値となるため、第1の電圧が第2の電圧に達しない状態となる。この結果、判定回路14bは矩形波を出力せず、平均値回路の出力電圧が低下する。即ち、コード短絡が発生すると、それを検知して、反転回路14dの出力であるコード短絡検知回路出力は電圧信号(コード短絡検出信号)を出力し、駆動回路13が起動してトリップコイル12がトリップ動作する。これは、半サイクル程度の現象であっても判定回路14bがそれを検出し、コード短絡検出信号を出力することができる。   If a voltage waveform showing such a characteristic is detected, the power supply / detection circuit 14a of the cord short-circuit generation circuit 14 has a peak value of the voltage waveform that is the first voltage less than 50% of the normal value. The first voltage does not reach the second voltage. As a result, the determination circuit 14b does not output a rectangular wave, and the output voltage of the average value circuit decreases. That is, when a code short-circuit occurs, it is detected, the code short-circuit detection circuit output that is the output of the inverting circuit 14d outputs a voltage signal (code short-circuit detection signal), the drive circuit 13 is activated, and the trip coil 12 is activated. Trip action. Even if this is a phenomenon of about half a cycle, the determination circuit 14b can detect it and output a code short circuit detection signal.

このように、電流変化に依らず電路電圧の波形変化からコード短絡を検出するため、負荷の突入電流や過負荷による大電流を考慮する必要が無くなり、ヒゲコード短絡を検出することができる。そして、電圧波形を絶対値化したピーク値の大きさで判断するため、半周期程度の電圧波形の変化で検出することができ、撚り線1本程度のヒゲコード短絡による電圧降下を検出することが可能となる。
更に、第1の電圧のピーク値に対する第2の電圧の比を2分の1程度にすることで、負荷の突入電流や過負荷による電圧降下を排除して、コード短絡のみを確実に検出することができる。
また、反転回路を設けることで判定回路を簡易な回路で構成できるし、平均値回路14cを設けることでノイズの少ない安定した信号を出力できる。
そして、ヒゲコード短絡が発生したらそれを検知してコンセント出力を停止するので、コード短絡による火災発生を確実に防止できる。
As described above, since the cord short circuit is detected from the change in the waveform of the circuit voltage regardless of the current change, it is not necessary to consider the inrush current of the load or the large current due to the overload, and the whisker cord short circuit can be detected. Since the voltage waveform is determined based on the absolute value of the peak value, it can be detected by a change in the voltage waveform of about a half cycle, and a voltage drop caused by a short beard cord short circuit of about one stranded wire can be detected. It becomes possible.
Furthermore, by reducing the ratio of the second voltage to the peak value of the first voltage to about one half, the voltage drop due to the inrush current of the load and the overload is eliminated, and only the cord short-circuit is reliably detected. be able to.
Further, the determination circuit can be configured with a simple circuit by providing an inverting circuit, and a stable signal with little noise can be output by providing the average value circuit 14c.
And if a beard cord short circuit occurs, it will be detected and an outlet output will be stopped, Therefore The fire by a cord short circuit can be prevented reliably.

尚、上記実施形態は、コード短絡検知回路14をコンセントに設けた場合を説明したが、分岐ブレーカ3等の回路遮断に内蔵させても良いし、必要に応じて設置するタップコンセントに内蔵させても良い。
また、コンセント装置に遮断機能を設けて、電路を遮断する構成としているが、コード短絡が発生したら、音やLEDの発光で通知する構成としても良い。
また、判定回路14cでは、第1の電圧の電圧波形ピーク値に対して第2の電圧の直流電圧を略2分の1としているが、この比に限定するものではない。但し、コード短絡発生時は、2分の1を大きく下回る電圧降下が発生するし、逆に負荷の突入電流等では2分の1まで低下することがないため、2分の1程度が好ましい。
In addition, although the said embodiment demonstrated the case where the cord short circuit detection circuit 14 was provided in the outlet, it may be built in circuit interruptions, such as the branch breaker 3, etc., and it is built in the tap outlet installed as needed. Also good.
Moreover, although the interruption | blocking apparatus is provided with the interruption | blocking function and it is set as the structure which interrupts | blocks an electric circuit, when a cord short circuit generate | occur | produces, it is good also as a structure notified by sound or light emission of LED.
In the determination circuit 14c, the DC voltage of the second voltage is approximately halved with respect to the voltage waveform peak value of the first voltage. However, the ratio is not limited to this ratio. However, when a cord short-circuit occurs, a voltage drop that is much less than one half occurs, and conversely, a load inrush current or the like does not decrease to one half.

1・・コンセント装置、2・・商用電源、4・・負荷、5・・コード短絡発生ヶ所、10・・コンセント、11・・接点(開閉手段)、12・・トリップコイル、13・・駆動回路、14・・コード短絡検知回路、14a・・電源・検出回路(電圧情報入手回路)、14b・・判定回路、14c・・平均値回路、14d・・反転回路、20・・全波整流回路、21・・第1出力回路、22・・第2出力回路、L・・電路。   1 ·· Outlet device 2 · · Commercial power supply · 4 · Load 5 · · Code short-circuit occurrence point 10 · · Outlet, 11 · · Contact (switching means), 12 · · Trip coil, · · · Drive circuit , 14... Code short circuit detection circuit, 14 a... Power supply and detection circuit (voltage information acquisition circuit), 14 b... Judgment circuit, 14 c... Average circuit, 14 d. 21 .. First output circuit, 22 .... Second output circuit, L .. Electric circuit.

Claims (5)

負荷へ電力を供給する電路の電圧情報を入手する電圧情報入手回路と、検出した電圧情報からコード短絡を判定する判定回路とを有し、
前記電圧情報入手回路は、入手した電圧情報から電路の電圧波形を絶対値化した第1の電圧と電路の電圧波形を直流化した第2の電圧とを出力し、
前記判定回路は、前記第1の電圧と前記第2の電圧とを比較して、両者の関係が所定の条件を満たしたらコード短絡発生と判定することを特徴とするコード短絡検知回路。
A voltage information acquisition circuit for acquiring voltage information of a circuit for supplying power to the load, and a determination circuit for determining a code short circuit from the detected voltage information;
The voltage information acquisition circuit outputs a first voltage obtained by converting the voltage waveform of the circuit into an absolute value from the obtained voltage information and a second voltage obtained by converting the voltage waveform of the circuit into a direct current,
The determination circuit compares the first voltage and the second voltage, and determines that a code short-circuit has occurred when a relationship between the two satisfies a predetermined condition.
電路が平常な状態において、前記第1の電圧の波形ピーク値に対して前記第2の電圧は特定の比率になるよう設定され、
前記判定回路は、前記第1の電圧のピーク値が前記第2の電圧に達しない電路状態が発生したら、コード短絡発生と判定することを特徴とする請求項1記載のコード短絡検知回路。
In a normal state of the electric circuit, the second voltage is set to a specific ratio with respect to the waveform peak value of the first voltage,
2. The cord short circuit detection circuit according to claim 1, wherein the determination circuit determines that a cord short circuit has occurred when an electric circuit state in which a peak value of the first voltage does not reach the second voltage occurs.
前記第2の電圧は、前記第1の電圧のピーク値に対して略2分の1の大きさであることを特徴とする請求項2記載のコード短絡検知回路。 3. The cord short circuit detection circuit according to claim 2, wherein the second voltage has a magnitude that is approximately one half of a peak value of the first voltage. 前記判定回路の出力を平均化する平均値回路と、前記平均値回路の出力を反転する反転回路とを有し、
前記判定回路は、前記第1の電圧のピーク値が前記第2の電圧を越えたら電圧信号を出力し、前記反転回路の出力をコード短絡発生を通知する信号としたことを特徴とする請求項2又は3に記載のコード短絡検知回路。
An average value circuit that averages the output of the determination circuit; and an inverting circuit that inverts the output of the average value circuit;
The determination circuit outputs a voltage signal when a peak value of the first voltage exceeds the second voltage, and uses an output of the inverting circuit as a signal for notifying occurrence of a code short circuit. The cord short circuit detection circuit according to 2 or 3.
負荷が連結された電源プラグを接続するコンセントと、前記コンセントに商用電力を供給するための電路と、前記電路上に設けた開閉手段と、前記開閉手段を開操作するトリップコイルと、請求項1乃至4の何れかに記載のコード短絡検知回路とを有し、
前記コード短絡検知回路がコード短絡を検出したら、前記トリップコイルがトリップ動作して電路を遮断することを特徴とするコンセント装置。
An outlet for connecting a power plug connected to a load, an electric circuit for supplying commercial electric power to the outlet, an opening / closing means provided on the electric circuit, and a trip coil for opening the opening / closing means. Or a cord short-circuit detection circuit according to any one of 4 to 4,
When the cord short circuit detection circuit detects a cord short circuit, the trip coil trips and interrupts the electric circuit.
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