JP5522734B2 - Short-circuit current interrupting device and short-circuit current interrupting method - Google Patents
Short-circuit current interrupting device and short-circuit current interrupting method Download PDFInfo
- Publication number
- JP5522734B2 JP5522734B2 JP2010238474A JP2010238474A JP5522734B2 JP 5522734 B2 JP5522734 B2 JP 5522734B2 JP 2010238474 A JP2010238474 A JP 2010238474A JP 2010238474 A JP2010238474 A JP 2010238474A JP 5522734 B2 JP5522734 B2 JP 5522734B2
- Authority
- JP
- Japan
- Prior art keywords
- bias voltage
- short
- line
- transmission line
- circuit
- 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.)
- Active
Links
Images
Landscapes
- Protection Of Static Devices (AREA)
- Direct Current Feeding And Distribution (AREA)
- Emergency Protection Circuit Devices (AREA)
Description
本発明は、回路に短絡電流が流れることを防止するための短絡電流遮断装置及び短絡電流遮断方法に関し、特に、交換機の送信線や受信線に短絡電流が流れることを防止するための短絡電流遮断装置及び短絡電流遮断方法に関する。 The present invention relates to a short-circuit current interrupting device and a short-circuit current interrupting method for preventing a short-circuit current from flowing through a circuit, and in particular, a short-circuit current interrupting for preventing a short-circuit current from flowing through a transmission line and a reception line of an exchange. The present invention relates to a device and a short-circuit current interruption method.
図１は、通常の交換機の送信線ＴＸ、受信線ＲＸ及びその周辺回路を示す。図１に示すように、受信線は、過電流保護素子ＰＴが閉じている状態において、−２７ボルトの電源に接続されているため、動作中心電圧が−２７ボルトとなっている。また、送信線は、グランドに接続されているため、動作中心電圧がゼロボルトとなっている。送信線ＴＸには、相互インダクタンスＭ１を介して、交換機内部からの信号が与えられる。また、受信線ＲＸの信号は、相互インダクタンスＭ２を介して、交換機内部に与えられる。ダイオードＤ１、Ｄ２は電圧リミッタである。 FIG. 1 shows a transmission line TX, a reception line RX, and peripheral circuits of a normal exchange. As shown in FIG. 1, since the receiving line is connected to a power supply of −27 volts in a state where the overcurrent protection element PT is closed, the operation center voltage is −27 volts. Further, since the transmission line is connected to the ground, the operation center voltage is zero volts. A signal from the inside of the exchange is given to the transmission line TX via the mutual inductance M1. The signal on the reception line RX is given to the inside of the exchange via the mutual inductance M2. Diodes D1 and D2 are voltage limiters.
特許文献１には、回路保護装置の一例が開示されている。 Patent Document 1 discloses an example of a circuit protection device.
図１に示す回路の送信線ＴＸ及び受信線ＲＸが電話機接続工事等の際に誤って短絡された場合、過電流保護素子ＰＴの左端子の電圧がゼロボルトとなり、一方で、過電流保護素子ＰＴの右端子の電圧は、−２７ボルトのままであるため、過電流保護素子ＰＴには、２７ボルトの電圧が印加されることとなり、これにより過電流保護素子のインピーダンスが高くなる。従って、送信線ＴＸに短絡電流が流れることを抑圧することができる。しかし、過電流保護素子ＰＴの許容値以上の短絡電流が流れたり、或いは、送信線ＴＸと受信線ＲＸが短絡されている時間が長すぎたりすると、過電流保護素子ＰＴ自体が損焼してしまう可能性がある。 When the transmission line TX and the reception line RX of the circuit shown in FIG. 1 are accidentally short-circuited during telephone connection construction or the like, the voltage at the left terminal of the overcurrent protection element PT becomes zero volts, while the overcurrent protection element PT Since the voltage at the right terminal of-remains at -27 volts, a voltage of 27 volts is applied to the overcurrent protection element PT, thereby increasing the impedance of the overcurrent protection element. Therefore, it is possible to suppress a short circuit current from flowing through the transmission line TX. However, if a short-circuit current that exceeds the allowable value of the overcurrent protection element PT flows, or if the time during which the transmission line TX and the reception line RX are short-circuited is too long, the overcurrent protection element PT itself is damaged. There is a possibility.
そこで、過電流保護素子ＰＴに代わって、短絡電流が流れることを防止したり、過電流保護素子ＰＴに加えて、短絡電流が流れることを防止することができるような短絡電流遮断装置が必要となってくる。 Therefore, in place of the overcurrent protection element PT, there is a need for a short-circuit current interrupting device that can prevent a short-circuit current from flowing or can prevent a short-circuit current from flowing in addition to the overcurrent protection element PT. It becomes.
特許文献１に記載の発明では、負荷回路への過電流の供給を電流検出手段により検出するので、電源レベルの変動を直接検出することができない。また、特許文献１に記載の発明では、負荷回路への電源電流の供給を、電源電圧を降下させることにより遮断するので、負荷が誘導抵抗である場合に適用することができない。 In the invention described in Patent Document 1, since the supply of overcurrent to the load circuit is detected by the current detection means, fluctuations in the power supply level cannot be directly detected. In the invention described in Patent Document 1, the supply of the power supply current to the load circuit is cut off by lowering the power supply voltage, and therefore cannot be applied when the load is an inductive resistor.
従って、特許文献１に開示されている回路保護装置を図１に示す回路に適用することは非常に困難である。 Therefore, it is very difficult to apply the circuit protection device disclosed in Patent Document 1 to the circuit shown in FIG.
そこで、本発明は、通常の交換機の構成に対応した短絡電流遮断装置及び短絡電流遮断方法を提供することを目的とする。 Then, an object of this invention is to provide the short circuit current interruption device and the short circuit current interruption method corresponding to the structure of the normal exchange.
本発明の第１の観点によれば、バイアス電圧供給手段より送信線と受信線の一方にグランド電位による第１のバイアス電圧を印加し、該送信線と該受信線の他方に前記グランド電位とは異なる第２のバイアス電圧を印加した交換機の短絡電流遮断装置であって、前記バイアス電圧供給手段と、前記送信線と前記受信線のうち前記第２のバイアス電圧を印加した線との間に配置した過電流保護手段と、前記第１のバイアス電圧と前記第２のバイアス電圧間の電圧変化をもとに前記送信線と前記受信線との短絡を検出する短絡検出手段と、前記短絡検出手段により前記短絡が検出された場合、前記バイアス電圧供給手段からの前記送信線と前記受信線へのバイアス電圧の供給を遮断し、前記短絡が検出されない場合、前記バイアス電圧供給手段からの前記バイアス電圧の供給を継続するように制御する制御手段と、を備え、前記短絡時、前記過電流保護手段により前記送信線および前記受信線への短絡電流の流入を阻止するとともに、前記制御手段によって前記バイアス電圧供給手段からの前記バイアス電圧の供給を遮断することにより前記過電流保護手段の一方端に前記第１のバイアス電圧が印加され他方端に前記第２のバイアス電圧が印加されるのを回避することを特徴とする短絡電流遮断装置が提供される。 According to the first aspect of the present invention, the bias voltage supply means applies a first bias voltage based on the ground potential to one of the transmission line and the reception line, and the ground potential is applied to the other of the transmission line and the reception line. Is a short-circuit current interrupting device for an exchange to which a different second bias voltage is applied, between the bias voltage supply means and a line to which the second bias voltage is applied among the transmission line and the reception line. An overcurrent protection means disposed; a short-circuit detection means for detecting a short-circuit between the transmission line and the reception line based on a voltage change between the first bias voltage and the second bias voltage; and the short-circuit detection. When the short circuit is detected by the means, the supply of the bias voltage to the transmission line and the reception line from the bias voltage supply means is interrupted, and when the short circuit is not detected, the bias voltage supply means Comprising of a control means for controlling to continue the supply of the bias voltage, during the short, as well as blocking the flow of short-circuit current to the transmission line and the reception line by the overcurrent protection means, said control The supply of the bias voltage from the bias voltage supply means is interrupted by the means, whereby the first bias voltage is applied to one end of the overcurrent protection means and the second bias voltage is applied to the other end. There is provided a short-circuit current interrupting device characterized by avoiding the above.
更に、本発明によれば、バイアス電圧供給手段より送信線と受信線の一方にグランド電位による第１のバイアス電圧を印加し、該送信線と該受信線の他方に前記グランド電位とは異なる第２のバイアス電圧を印加し、該バイアス電圧供給手段と、該送信線と該受信線のうち前記第２のバイアス電圧を印加した線との間に過電流保護手段を配置した交換機の短絡電流遮断方法であって、前記第１のバイアス電圧と前記第２のバイアス電圧間の電圧変化をもとに前記送信線と前記受信線との短絡を検出する短絡検出ステップと、前記短絡検出ステップで前記短絡が検出された場合、前記バイアス電圧供給手段からの前記送信線と前記受信線へのバイアス電圧の供給を遮断し、前記短絡が検出されない場合、前記バイアス電圧供給手段からの前記バイアス電圧の供給を継続するように制御する制御ステップと、を備え、前記短絡時、前記過電流保護手段により前記送信線および前記受信線への短絡電流の流入を阻止するとともに、前記制御ステップにおいて前記バイアス電圧供給手段からの前記バイアス電圧の供給を遮断することにより前記過電流保護手段の一方端に前記第１のバイアス電圧が印加され他方端に前記第２のバイアス電圧が印加されるのを回避することを特徴とする短絡電流遮断方法が提供される。 Further, according to the present invention, the bias voltage supply means applies a first bias voltage based on the ground potential to one of the transmission line and the reception line, and the other of the transmission line and the reception line differs from the ground potential. 2 is applied, and a short-circuit current is cut off in an exchange in which an overcurrent protection unit is disposed between the bias voltage supply unit and the transmission line and the reception line to which the second bias voltage is applied. A method of detecting a short circuit between the transmission line and the reception line based on a voltage change between the first bias voltage and the second bias voltage; and When a short circuit is detected, supply of a bias voltage to the transmission line and the reception line from the bias voltage supply unit is interrupted. When a short circuit is not detected, the bias voltage supply unit supplies the bias voltage. And a control step for controlling to continue the supply of the astigmatism voltage, a time the short, as well as blocking the flow of short-circuit current to the transmission line and the reception line by the overcurrent protection means, in said control step By interrupting the supply of the bias voltage from the bias voltage supply means, the first bias voltage is applied to one end of the overcurrent protection means, and the second bias voltage is applied to the other end. A short-circuit current interrupting method is provided that is characterized in that it is avoided.
本発明によれば、送信線の電圧と受信線の電圧とが近づいたか否かを基準として、送信線と受信線との短絡を検出するので、通常の交換機の構成に対応することができる。 According to the present invention, since a short circuit between the transmission line and the reception line is detected based on whether or not the voltage of the transmission line and the voltage of the reception line are close to each other, it is possible to cope with the configuration of a normal exchange.
以下、図面を参照して本発明を実施するための形態について詳細に説明する。 DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings.
図２は、本発明の実施形態による短絡電流遮断装置が追加された、交換機の送信線ＴＸ、受信線ＲＸ及びその周辺回路を示す。短絡電流遮断装置は、ＮＰＮトランジスタＴＲ１、抵抗Ｒ１、Ｒ２、Ｒ３、Ｒ４を含む短絡検出部と、ＰＮＰトランジスタＴＲ２、ＮＰＮトランジスタＴＲ３、抵抗Ｒ５、Ｒ６、Ｒ７、Ｒ８、Ｒ９、Ｒ１０を含む切断部と、制御回路を含む。短絡電流遮断装置以外の部分は、通常の回路である。 FIG. 2 shows a transmission line TX, a reception line RX and its peripheral circuit of an exchange to which a short-circuit current interrupting device according to an embodiment of the present invention is added. The short-circuit current interrupting device includes a short-circuit detecting unit including an NPN transistor TR1, resistors R1, R2, R3, and R4, and a disconnecting unit including a PNP transistor TR2, an NPN transistor TR3, and resistors R5, R6, R7, R8, R9, and R10. Including a control circuit. The part other than the short-circuit current interrupting device is a normal circuit.
送信線ＴＸと受信線ＲＸとが短絡していないときには、送信線ＴＸの動作中心電圧は、−２７ボルトであるため、ＮＰＮトランジスタＴＲ１のベース電圧がＮＰＮトランジスタＴＲ１のエミッタ電圧よりも低い。従って、ＮＰＮトランジスタＴＲ１にコレクタ電流は流れず、従って、端子ＡＬＭの電圧は３．３ボルトとなる。 When the transmission line TX and the reception line RX are not short-circuited, since the operation center voltage of the transmission line TX is −27 volts, the base voltage of the NPN transistor TR1 is lower than the emitter voltage of the NPN transistor TR1. Therefore, no collector current flows through the NPN transistor TR1, and therefore the voltage at the terminal ALM is 3.3 volts.
送信線ＴＸと受信線ＲＸとが短絡すると、送信線ＴＸの電圧は、ゼロボルトとなる。そして、抵抗Ｒ１と抵抗Ｒ２と抵抗Ｒ３の抵抗値は、送信線ＴＸの電圧がゼロボルトのときにＮＰＮトランジスタＴＲ１のベース・エミッタ間電圧がトランジスタＴＲ１の閾値（０．７ボルト程度）を上回るように設定されている。従って、送信線ＴＸと受信線ＲＸとが短絡すると、ＮＰＮトランジスタＴＲ１にコレクタ電流が流れ、従って、端子ＡＬＭの電圧は、ゼロボルトとなる。 When the transmission line TX and the reception line RX are short-circuited, the voltage of the transmission line TX becomes zero volts. The resistance values of the resistors R1, R2, and R3 are set so that the base-emitter voltage of the NPN transistor TR1 exceeds the threshold value (about 0.7 volts) of the transistor TR1 when the voltage of the transmission line TX is zero volts. Is set. Therefore, when the transmission line TX and the reception line RX are short-circuited, a collector current flows through the NPN transistor TR1, and the voltage at the terminal ALM becomes zero volts.
一方、端子ＰＯＷＥＲ＿ＯＦＦの電圧が３．３ボルトであると、ＰＮＰトランジスタＴＲ２のエミッタ電圧とベース電圧が等しくなるため、ＰＮＰトランジスタＴＲ２にコレクタ電流は流れない。従って、ＮＰＮトランジスタＴＲ３のベース電圧は、ＮＰＮトランジスタＴＲ３のエミッタ電圧と等しくなる。従って、ＮＰＮトランジスタＴＲ３にはコレクタ電流が流れない（ＮＰＮトランジスタＴＲ３はオフ状態となる）。 On the other hand, when the voltage at the terminal POWER_OFF is 3.3 volts, the emitter voltage and the base voltage of the PNP transistor TR2 are equal, and therefore no collector current flows through the PNP transistor TR2. Therefore, the base voltage of the NPN transistor TR3 is equal to the emitter voltage of the NPN transistor TR3. Accordingly, no collector current flows through the NPN transistor TR3 (the NPN transistor TR3 is turned off).
また、抵抗Ｒ５と抵抗Ｒ６と抵抗Ｒ７の抵抗値は、端子ＰＯＷＥＲ＿ＯＦＦの電圧がゼロボルトであるときに、ＰＮＰトランジスタＴＲ２のベース・エミッタ間電圧がＰＮＰトランジスタＴＲ２の閾値（０．７ボルト程度）を上回るように設定されている。また、抵抗Ｒ８と抵抗Ｒ９と抵抗Ｒ１０の抵抗値は、ＰＮＰトランジスタＴＲ２にコレクタ電流が流れたときに、ＮＰＮトランジスタＴＲ３のベース・エミッタ間電圧がＮＰＮトランジスタの閾値（０．７ボルト程度）を上回るように設定されている。従って、端子ＰＯＷＥＲ＿ＯＦＦの電圧がゼロボルトとなると、ＮＰＮトランジスタＴＲ３にコレクタ電流が流れる（ＮＰＮトランジスタＴＲ３はオン状態となる）。 The resistance values of the resistors R5, R6, and R7 are such that when the voltage at the terminal POWER_OFF is zero volts, the base-emitter voltage of the PNP transistor TR2 exceeds the threshold value (about 0.7 volts) of the PNP transistor TR2. Is set to The resistance values of the resistors R8, R9, and R10 are such that when the collector current flows through the PNP transistor TR2, the base-emitter voltage of the NPN transistor TR3 exceeds the threshold value of the NPN transistor (about 0.7 volts). Is set to Accordingly, when the voltage at the terminal POWER_OFF becomes zero volts, a collector current flows through the NPN transistor TR3 (the NPN transistor TR3 is turned on).
従って、制御回路が、端子ＡＬＭの電圧が３．３ボルトであるときに、端子ＰＯＷＥＲ＿ＯＦＦの電圧をゼロボルトにして、端子ＡＬＭの電圧がゼロボルトであるときに、端子ＰＯＷＥＲ＿ＯＦＦの電圧を３．３ボルトにすることにより、送信線ＴＸと受信線ＲＸとが短絡していないときに、ＮＰＮトランジスタＴＲ３をオン状態にして、送信線ＴＸの動作中心電圧を−２７ボルトにすると共に、送信線ＴＸと受信線ＲＸとが短絡したときに、ＮＰＮトランジスタＴＲ３をオフ状態にして、過電流保護素子ＰＴの両端に２７ボルトの電圧がかからないようにすることができる。 Therefore, when the voltage at the terminal ALM is 3.3 volts, the control circuit sets the voltage at the terminal POWER_OFF to zero volts, and when the voltage at the terminal ALM is zero volts, the voltage at the terminal POWER_OFF is 3.3 volts. As a result, when the transmission line TX and the reception line RX are not short-circuited, the NPN transistor TR3 is turned on, the operation center voltage of the transmission line TX is set to −27 volts, and the transmission line TX and the reception line are set. When RX is short-circuited, the NPN transistor TR3 can be turned off so that a voltage of 27 volts is not applied across the overcurrent protection element PT.
また、切断部と同等の回路が図２に示すＡの部分の接続／切断を制御することによっても、送信線ＴＸと受信線ＲＸとが短絡したときに、過電流保護素子ＰＴの両端に２７ボルトの電圧がかからないようにすることができる。 Further, when a circuit equivalent to the disconnection unit controls connection / disconnection of the portion A shown in FIG. 2, when the transmission line TX and the reception line RX are short-circuited, both ends of the overcurrent protection element PT are connected to both ends. The voltage of volts can be prevented from being applied.
本実施形態によれば、送信線の電圧と受信線の電圧とが近づいたか否かを基準として、送信線と受信線との短絡を検出するので、通常の交換機の構成に対応することができる。 According to the present embodiment, since a short circuit between the transmission line and the reception line is detected based on whether or not the voltage of the transmission line and the voltage of the reception line are close to each other, it is possible to cope with the configuration of a normal exchange. .
また、本実施形態によれば、短絡検出部により送信線と受信線との短絡が検出されたときに、送信線と送信線にバイアス電圧を与える線とを切断するので、通常の交換機の構成に対応することができる。 Further, according to the present embodiment, when a short circuit between the transmission line and the reception line is detected by the short circuit detection unit, the transmission line and the line that applies a bias voltage to the transmission line are disconnected. It can correspond to.
上記の実施形態の一部又は全部は、以下の付記のようにも記載されうるが、以下には限られない。 A part or all of the above-described embodiment can be described as in the following supplementary notes, but is not limited thereto.
（付記１）
送信線と受信線との短絡を、前記送信線の電圧と前記受信線との電圧とが近づいたか否かを基準として、検出する短絡検出手段と、
前記短絡検出手段により前記送信線と前記受信線との短絡が検出されたときに、前記送信線と該送信線にバイアス電圧を与える線とを切断する切断手段と、
を備えることを特徴とする短絡電流遮断装置。
(Appendix 1)
A short circuit detecting means for detecting a short circuit between the transmission line and the reception line based on whether the voltage of the transmission line and the voltage of the reception line are close to each other;
Cutting means for cutting the transmission line and a line for applying a bias voltage to the transmission line when a short circuit between the transmission line and the reception line is detected by the short-circuit detection means;
A short-circuit current interrupting device comprising:
（付記２）
送信線と受信線との短絡を、前記送信線の電圧と前記受信線との電圧とが近づいたか否かを基準として、検出する短絡検出手段と、
前記短絡検出手段により前記送信線と前記受信線との短絡が検出されたときに、前記受信線と該受信線にバイアス電圧を与える線とを切断する切断手段と、
を備えることを特徴とする短絡電流遮断装置。
(Appendix 2)
A short circuit detecting means for detecting a short circuit between the transmission line and the reception line based on whether the voltage of the transmission line and the voltage of the reception line are close to each other;
Cutting means for cutting the receiving line and a line for applying a bias voltage to the receiving line when a short circuit between the transmitting line and the receiving line is detected by the short-circuit detecting means;
A short-circuit current interrupting device comprising:
（付記３）
付記１又は付記２に記載の短絡電流遮断装置であって、
前記短絡検出手段は、前記送信線の電圧が前記受信線の電圧に近づいたか否かを基準として、前記送信線と前記受信線との短絡を検出することを特徴とする短絡電流遮断装置。
(Appendix 3)
The short-circuit current interrupting device according to appendix 1 or appendix 2,
The short-circuit detection unit is characterized in that a short-circuit between the transmission line and the reception line is detected based on whether or not the voltage of the transmission line approaches the voltage of the reception line.
（付記４）
付記１又は付記２に記載の短絡電流遮断装置であって、
前記送信線と前記受信線とのうちの一方はグランドによってバイアス電圧がかけられており、
前記短絡検出手段は、前記送信線と前記受信線とのうち前記グランドによってバイアス電圧をかけられている線でないほうの線の電圧が前記グランドの電圧に近づいたか否かを基準として、前記送信線と前記受信線との短絡を検出することを特徴とする短絡電流遮断装置。
(Appendix 4)
The short-circuit current interrupting device according to appendix 1 or appendix 2,
One of the transmission line and the reception line is biased by ground,
The short-circuit detection means is configured to determine whether the voltage of the transmission line and the reception line, which is not the line biased by the ground, approaches the ground voltage. And a short circuit between the receiving line and the short circuit current interrupting device.
（付記５）
付記１乃至４の何れか１に記載の短絡電流遮断装置であって、
前記短絡検出手段は、前記送信線と前記受信線とが短絡しているか否かを示す検出信号を出力し、
前記切断手段は、切断信号が切断要求を示すときに、前記送信線と該送信線にバイアス電圧を与える線とを切断し、
当該短絡電流遮断装置は、前記検出信号が、前記送信線と前記受信線とが短絡しているときに、前記切断信号が切断要求を示すようにする制御手段を更に備えることを特徴とする短絡電流遮断装置。
(Appendix 5)
The short-circuit current interrupting device according to any one of appendices 1 to 4,
The short-circuit detection means outputs a detection signal indicating whether the transmission line and the reception line are short-circuited,
The disconnecting means disconnects the transmission line and a line for applying a bias voltage to the transmission line when a disconnection signal indicates a disconnection request,
The short-circuit current interrupting device further includes a control unit that causes the disconnection signal to indicate a disconnection request when the detection signal is short-circuited between the transmission line and the reception line. Current interrupt device.
（付記６）
送信線と受信線との短絡を、前記送信線の電圧と前記受信線との電圧とが近づいたか否かを基準として、検出する短絡検出ステップと、
前記短絡検出ステップにより前記送信線と前記受信線との短絡が検出されたときに、前記送信線と該送信線にバイアス電圧を与える線とを切断する切断ステップと、
を有することを特徴とする短絡電流遮断方法。
(Appendix 6)
A short-circuit detection step for detecting a short-circuit between the transmission line and the reception line based on whether or not the voltage of the transmission line and the voltage of the reception line are close to each other;
A disconnecting step of disconnecting the transmission line and a line for applying a bias voltage to the transmission line when a short circuit between the transmission line and the reception line is detected by the short-circuit detection step;
A method of interrupting a short-circuit current, comprising:
（付記７）
送信線と受信線との短絡を、前記送信線の電圧と前記受信線との電圧とが近づいたか否かを基準として、検出する短絡検出ステップと、
前記短絡検出ステップにより前記送信線と前記受信線との短絡が検出されたときに、前記受信線と該受信線にバイアス電圧を与える線とを切断する切断ステップと、
を有することを特徴とする短絡電流遮断方法。
(Appendix 7)
A short-circuit detection step for detecting a short-circuit between the transmission line and the reception line based on whether or not the voltage of the transmission line and the voltage of the reception line are close to each other;
A disconnecting step of disconnecting the receiving line and a line for applying a bias voltage to the receiving line when a short circuit between the transmitting line and the receiving line is detected by the short-circuit detecting step;
A method of interrupting a short-circuit current, comprising:
（付記８）
付記６又は７に記載の短絡電流遮断方法であって、
前記短絡検出ステップでは、前記送信線の電圧が前記受信線の電圧に近づいたか否かを基準として、前記送信線と前記受信線との短絡を検出することを特徴とする短絡電流遮断方法。
(Appendix 8)
The short-circuit current interrupting method according to appendix 6 or 7,
In the short circuit detection step, a short circuit between the transmission line and the reception line is detected based on whether or not the voltage of the transmission line approaches the voltage of the reception line.
（付記９）
付記６又は７に記載の短絡電流遮断方法であって、
前記送信線と前記受信線とのうちの一方はグランドによってバイアス電圧がかけられており、
前記短絡検出ステップでは、前記送信線と前記受信線とのうち前記グランドによってバイアス電圧をかけられている線でないほうの線の電圧が前記グランドの電圧に近づいたか否かを基準として、前記送信線と前記受信線との短絡を検出することを特徴とする短絡電流遮断方法。
(Appendix 9)
The short-circuit current interrupting method according to appendix 6 or 7,
One of the transmission line and the reception line is biased by ground,
In the short-circuit detection step, the transmission line is determined based on whether or not the voltage of the transmission line and the reception line that is not the line biased by the ground approaches the ground voltage. And a short circuit between the receiving line and the short circuit current interruption method.
（付記１０）
付記６乃至９の何れか１に記載の短絡電流遮断方法であって、
前記短絡検出ステップでは、前記送信線と前記受信線とが短絡しているか否かを示す検出信号を出力し、
前記切断ステップでは、切断信号が切断要求を示すときに、前記送信線と該送信線にバイアス電圧を与える線とを切断し、
当該短絡電流遮断方法は、前記検出信号が、前記送信線と前記受信線とが短絡しているときに、前記切断信号が切断要求を示すようにする制御ステップを更に有することを特徴とする短絡電流遮断方法。
(Appendix 10)
The short-circuit current interrupting method according to any one of appendices 6 to 9,
In the short-circuit detection step, a detection signal indicating whether or not the transmission line and the reception line are short-circuited,
In the disconnecting step, when the disconnect signal indicates a disconnect request, the transmit line and a line that applies a bias voltage to the transmit line are disconnected,
The short-circuit current interruption method further includes a control step in which the disconnection signal indicates a disconnection request when the detection signal is short-circuited between the transmission line and the reception line. Current interruption method.
Ｒ１〜Ｒ１０ 抵抗
ＴＲ１ ＮＰＮトランジスタ
ＴＲ２ ＰＮＰトランジスタ
ＴＲ３ ＮＰＮトランジスタ
R1 to R10 Resistance TR1 NPN transistor TR2 PNP transistor TR3 NPN transistor
Claims (2)
前記バイアス電圧供給手段と、前記送信線と前記受信線のうち前記第２のバイアス電圧を印加した線との間に配置した過電流保護手段と、
前記第１のバイアス電圧と前記第２のバイアス電圧間の電圧変化をもとに前記送信線と前記受信線との短絡を検出する短絡検出手段と、
前記短絡検出手段により前記短絡が検出された場合、前記バイアス電圧供給手段からの前記送信線と前記受信線へのバイアス電圧の供給を遮断し、前記短絡が検出されない場合、前記バイアス電圧供給手段からの前記バイアス電圧の供給を継続するように制御する制御手段と、
を備え、
前記短絡時、前記過電流保護手段により前記送信線および前記受信線への短絡電流の流入を阻止するとともに、前記制御手段によって前記バイアス電圧供給手段からの前記バイアス電圧の供給を遮断することにより前記過電流保護手段の一方端に前記第１のバイアス電圧が印加され他方端に前記第２のバイアス電圧が印加されるのを回避することを特徴とする短絡電流遮断装置。 An exchange in which a first bias voltage based on a ground potential is applied to one of a transmission line and a reception line from a bias voltage supply means, and a second bias voltage different from the ground potential is applied to the other of the transmission line and the reception line. A short-circuit current interrupting device of
An overcurrent protection unit disposed between the bias voltage supply unit and a line to which the second bias voltage is applied among the transmission line and the reception line;
Short-circuit detection means for detecting a short-circuit between the transmission line and the reception line based on a voltage change between the first bias voltage and the second bias voltage;
When the short circuit is detected by the short circuit detection unit, supply of the bias voltage to the transmission line and the reception line from the bias voltage supply unit is cut off. When the short circuit is not detected, from the bias voltage supply unit Control means for controlling the supply of the bias voltage to be continued,
With
At the time of the short circuit, the overcurrent protection unit prevents the short circuit current from flowing into the transmission line and the reception line, and the control unit cuts off the supply of the bias voltage from the bias voltage supply unit. A short-circuit current interrupting device that avoids applying the first bias voltage to one end of the overcurrent protection means and applying the second bias voltage to the other end.
前記第１のバイアス電圧と前記第２のバイアス電圧間の電圧変化をもとに前記送信線と前記受信線との短絡を検出する短絡検出ステップと、
前記短絡検出ステップで前記短絡が検出された場合、前記バイアス電圧供給手段からの前記送信線と前記受信線へのバイアス電圧の供給を遮断し、前記短絡が検出されない場合、前記バイアス電圧供給手段からの前記バイアス電圧の供給を継続するように制御する制御ステップと、
を備え、
前記短絡時、前記過電流保護手段により前記送信線および前記受信線への短絡電流の流入を阻止するとともに、前記制御ステップにおいて前記バイアス電圧供給手段からの前記バイアス電圧の供給を遮断することにより前記過電流保護手段の一方端に前記第１のバイアス電圧が印加され他方端に前記第２のバイアス電圧が印加されるのを回避することを特徴とする短絡電流遮断方法。 A bias voltage supply means applies a first bias voltage based on a ground potential to one of the transmission line and the reception line, and applies a second bias voltage different from the ground potential to the other of the transmission line and the reception line , A short-circuit current interruption method for an exchange in which an overcurrent protection means is disposed between the bias voltage supply means and a line to which the second bias voltage is applied among the transmission line and the reception line,
A short-circuit detection step for detecting a short-circuit between the transmission line and the reception line based on a voltage change between the first bias voltage and the second bias voltage;
When the short circuit is detected in the short circuit detection step, the supply of the bias voltage to the transmission line and the reception line from the bias voltage supply unit is cut off. When the short circuit is not detected, from the bias voltage supply unit A control step for controlling the supply of the bias voltage to be continued;
With
At the time of the short circuit, the overcurrent protection means prevents the short circuit current from flowing into the transmission line and the reception line, and the supply of the bias voltage from the bias voltage supply means is interrupted in the control step. A method of interrupting a short-circuit current, wherein the first bias voltage is applied to one end of the overcurrent protection means and the second bias voltage is not applied to the other end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2010238474A JP5522734B2 (en) | 2010-10-25 | 2010-10-25 | Short-circuit current interrupting device and short-circuit current interrupting method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2010238474A JP5522734B2 (en) | 2010-10-25 | 2010-10-25 | Short-circuit current interrupting device and short-circuit current interrupting method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2012095386A JP2012095386A (en) | 2012-05-17 |
| JP5522734B2 true JP5522734B2 (en) | 2014-06-18 |
Family
ID=46388135
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2010238474A Active JP5522734B2 (en) | 2010-10-25 | 2010-10-25 | Short-circuit current interrupting device and short-circuit current interrupting method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP5522734B2 (en) |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS53138209A (en) * | 1977-05-09 | 1978-12-02 | Hitachi Ltd | Protective system of trunk circuit |
| JPH04150363A (en) * | 1990-10-11 | 1992-05-22 | Nec Corp | Grounding protection system for line current supply circuit |
-
2010
- 2010-10-25 JP JP2010238474A patent/JP5522734B2/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| JP2012095386A (en) | 2012-05-17 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP4849094B2 (en) | Ground fault detection circuit | |
| JP2019505156A (en) | Circuit for interrupting AC current | |
| US7609494B2 (en) | Voltage protection system and method for a powered device | |
| US6418222B2 (en) | High current protection circuit for telephone interface | |
| JP2005257256A (en) | Control device for air conditioner | |
| US8514530B2 (en) | Load control and protection system | |
| JP5522734B2 (en) | Short-circuit current interrupting device and short-circuit current interrupting method | |
| JPS6253981B2 (en) | ||
| JP2006271077A (en) | Portable electronic equipment | |
| KR20030008610A (en) | Circuit to protect battery for mobile phone | |
| US8411848B2 (en) | Telephone interface circuit for providing over-current and over-voltage protection | |
| JP2018182962A (en) | Motor control device | |
| US20170134017A1 (en) | Overcurrent protection circuit | |
| KR102111400B1 (en) | Protection circuit of entrance apparatus and entrance door apparatus including the same | |
| JP2009240007A (en) | Power supply circuit | |
| JPH08140273A (en) | Load short-circuit protective circuit | |
| US20240097436A1 (en) | Electronic device and method for protecting equipment from voltage surge damage | |
| CN212305364U (en) | 485 communication circuit module and system | |
| CN114336506B (en) | Overcurrent protection circuit and drive circuit of display panel | |
| JP3594522B2 (en) | Audio signal amplifier circuit and television receiver using the same | |
| JP2011055493A (en) | Overvoltage protection with power sink | |
| WO2021204110A1 (en) | Over-current protection system | |
| JP2011250088A (en) | Signal generator protection circuit | |
| JP4645430B2 (en) | Detection system | |
| KR101583266B1 (en) | Dual State Telephone Network SPD |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A977 | Report on retrieval |
Free format text: JAPANESE INTERMEDIATE CODE: A971007 Effective date: 20130321 |
|
| A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20130408 |
|
| A521 | Written amendment |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20130605 |
|
| A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20131225 |
|
| A521 | Written amendment |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20140219 |
|
| TRDD | Decision of grant or rejection written | ||
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 20140312 |
|
| A61 | First payment of annual fees (during grant procedure) |
Free format text: JAPANESE INTERMEDIATE CODE: A61 Effective date: 20140403 |
|
| R150 | Certificate of patent or registration of utility model |
Ref document number: 5522734 Country of ref document: JP Free format text: JAPANESE INTERMEDIATE CODE: R150 |
|
| S533 | Written request for registration of change of name |
Free format text: JAPANESE INTERMEDIATE CODE: R313533 |
|
| R350 | Written notification of registration of transfer |
Free format text: JAPANESE INTERMEDIATE CODE: R350 |