JP3597147B2

JP3597147B2 - Reverse connection prevention circuit

Info

Publication number: JP3597147B2
Application number: JP2001178785A
Authority: JP
Inventors: 啓成酒井
Original assignee: 埼玉日本電気株式会社
Priority date: 2001-06-13
Filing date: 2001-06-13
Publication date: 2004-12-02
Anticipated expiration: 2021-06-13
Also published as: JP2002374621A

Description

【０００１】
【発明の属する技術分野】
本発明は、直流電源を入力する機器に用いる逆接防止回路に関し、特に携帯電話無線基地局装置等に使用する逆接防止回路に関する。
【０００２】
【従来の技術】
携帯電話無線基地局など常に高い信頼性の維持が求められる通信装置等では、電源の障害によるサービスの断を避けるために、一次電源入力を０系、１系等の２系統の冗長構成を採用している。このような通信装置の設置工事や移設工事等を行った時、極性を誤って一次電源を接続した場合でも、装置への損傷が生じないように、一次電源から、装置内で使用する複数の電圧源を作るための電源変換ユニット内に逆接防止手段が設けられている。従来の逆接防止手段ではヒューズを使用している。このような系においては、片系は正規な接続で残り片系が逆接となった場合、ヒューズが切断するため、改修するためにコストが掛かっており問題であった。
【０００３】
図２は、従来例の逆接防止回路を備えた電源回路のブロック図である。図２において、通信装置等の電源にとっての負荷２２３には、０系一次電源２０１と１系一次電源２１１の２系統の電源が並列して供給される。一次電源は、電源変換ユニット２０５、２１５を介して負荷に接続される、電源変換ユニット２０５と２１５は、装置内で使用する複数の電圧値の二次電源を一次電源から作る二次変換部２０９、２１９と逆接防止回路２１０、２２０で構成されている。図２では、二次変換部２０９及び２１９は、逆接防止回路を構成する要素ではないので、破線で示してある。
従来例の逆接防止回路は、０系一次電源入力端子２０２のマイナス極側から負荷２２３の間にはノンヒューズブレーカ（以下ＮＦＢと略す）ＮＦＢ２０６とダイオード２０７が設置され、０系一次電源入力端子２０２のプラス極側から負荷２２３の間に、ヒューズ２０８が設置される構成となっている。
１系の構成も０系と同じである。１系一次電源入力端子２１２のマイナス極側から負荷２２３の間にはノンヒューズブレーカ（以下ＮＦＢと略す）ＮＦＢ２１６とダイオード２１７が設置され、１系一次電源入力端子２１２のプラス極側から負荷２２３の間に、ヒューズ２１８が設置される構成となっている。
負荷２２３を稼働させる時に、ＮＦＢをメイク（短絡）することで電源が供給される。ダイオード２０７、２１７は、カソード側を一次電源入力端子に設置されており、電流方向を負荷２２３から一次電源入力端子へと一方向に固定する。
今、図２に示すように１系一次電源２１１の正極が１系一次電源入力端子２１２の１系マイナスライン２１３に誤って接続される逆接続された状態で、ＮＦＢ２１６をメイクすると、負荷の手前で接続されている０、１系プラスライン２２２を経由して０系プラスライン２０４から、１系プラスライン２１４に電流が流れ、ヒューズ２０８と２１８の両方またはどちらかが熱溶断する。ヒューズが切断することで負荷２２３に対し逆電位が印加されないようになっている。
【０００４】
【発明が解決しようとする課題】
しかし、従来例の逆接防止回路は、ヒューズが切断するため、改修するためにコストが掛かっており問題であった。
本発明の目的は、携帯電話無線基地局装置等の一次電源入力に０、１系等の冗長構成にて稼動している装置において、入力のどちらか片系を誤って逆接（＋極と−極を逆に接続）してしまった場合、それを即座に検出し電源供給を遮断することにより一次電源の短絡や部品、装置の破損等を防止することができる逆接防止回路を提供することにある。
【０００５】
【課題を解決するための手段】
本発明の請求項１に係わる発明の逆接防止回路は、正極性及び負極性を有する直流一次電源に接続し電気的負荷に前記一次電源並びに前記一次電源から生成する二次出力を供給する電源回路において、前記電源回路が前記負荷に対して０系、及び１系の冗長構成を有し、前記冗長構成の２つの電源回路のどちらかを前記一次電源に対して極性の異なる逆接続を行った時、前記負荷への前記一次電源の入力を遮断し、前記逆接続を解除した時、前記逆接防止回路へ外部から入力するリセット信号によって前記負荷へ前記一次電源を再接続する前記電源回路を前記正負の入力極性を誤って前記一次電源に接続することを防止する逆接防止回路であって、
前記逆接防止回路が、前記一次電源を前記負荷に接続する正極ライン中に、電流方向を検出し、前記電流方向が異常である場合に電流遮断制御信号を発する電流検出手段と、前記電流検出手段に直列に配され、前記電流遮断制御信号を受信した場合に前記正極ラインを遮断し、前記リセット信号を受信した場合に前記正極ラインを再接続する電流遮断手段を備え、前記負極ライン中に、ブレーカと、前記電源側にカソード端子、前記負荷側にアノード端子を配したダイオードを前記ブレーカに直列に備え、前記電流遮断手段が、接続状態及び遮断状態の動作状態を保持し、前記リセット信号を受信した時に、前記保持状態が前記遮断状態であれば、前記保持状態を遮断状態から接続状態に切り換え、前記保持状態が前記接続状態であれば、前記保持状態の切り換えは行わないラッチリレーであることを特徴とする。
また、本発明の請求項２に係わる発明の逆接防止回路は、正極性及び負極性を有する直流一次電源に接続し電気的負荷に前記一次電源並びに前記一次電源から生成する二次出力を供給する電源回路において、前記電源回路が前記負荷に対して０系、及び１系の冗長構成を有し、前記冗長構成の２つの電源回路のどちらかを前記一次電源に対して極性の異なる逆接続を行った時、前記負荷への前記一次電源の入力を遮断し、前記逆接続を解除した時、前記逆接防止回路へ外部から入力するリセット信号によって前記負荷へ前記一次電源を再接続する前記電源回路を前記正負の入力極性を誤って前記一次電源に接続することを防止する逆接防止回路であって、
前記逆接防止回路が、前記一次電源を前記負荷に接続する正極ライン中に、ブレーカと、前記電源側にアノード端子、前記負荷側にカソード端子を配したダイオードを前記ブレーカに直列に備え、前記負極ライン中に、電流方向を検出し、前記電流方向が異常である場合に電流遮断制御信号を発する電流検出手段と、前記電流検出手段に直列に配され、前記電流遮断制御信号を受信した場合に前記負極ラインを遮断し、前記リセット信号を受信した場合に前記負極ラインを再接続する電流遮断手段を備え、
前記電流遮断手段が、接続状態及び遮断状態の動作状態を保持し、前記リセット信号を受信した時に、前記保持状態が前記遮断状態であれば、前記保持状態を遮断状態から接続状態に切り換え、前記保持状態が前記接続状態であれば、前記保持状態の切り換えは行わないラッチリレーであることを特徴とする。
また、本発明の請求項３に係わる発明の逆接防止回路は、前記請求項１または２の何れかに記載の前記電流検出手段が、ホール素子であることを特徴とする。
【０００６】
【発明の実施の形態】
本発明の逆接防止回路の実施形態について図面を参照して説明する。
図１は、本発明の逆接防止回路の一実施形態を備えた電源回路のブロック図である。図１において、負荷１４３への一次電源供給は０系一次電源入力端子１０２からと１系一次電源入力端子１２２からの冗長構成である。一次電源入力から電源変換ユニット内の二次変換部において二次出力を発生し、一次電源と合わせて負荷１４３に供給される。逆接防止回路１１２は、電源変換ユニット１０５、１２５内で一次電源ラインに配設される。図１において、二次変換部は、逆接防止回路を構成する要素ではないので、破線で示してある。
【０００７】
本発明の逆接防止回路１１２、１３２の構成を説明する。
０系では、一次電源入力端子１０２のマイナス極側から負荷１４３の間にはＮＦＢ１０６とダイオード１０７が設置され、負荷１４３稼働時にはＮＦＢ１０６をメイクすることで一次電源を供給する。ダイオード１０７は、カソード側を０系一次電源入力端子１０２に設置することで、電流方向を負荷１４３から０系一次電源入力端子１０２へと一方向に固定する。０系一次電源入力端子１０２のプラス極側から負荷１４３の間には電流検出部１０８及び電流遮断部１１０が設置されている。電流検出部１０８は、０系一次電源入力端子１０２のプラス側に流れる電流方向を電流検出部１０８内部のホール素子を用いて検知し、異常時には遮断制御信号１０９を出力する。電流遮断部１１０は、遮断制御信号１０９を入力すると内部のリレーをブレークして、そこに接続されている一次電源の遮断を行う。
１系においても、一次電源入力端子１２２のマイナス極側から負荷１４３の間にはＮＦＢ１２６とダイオード１２７が設置され、負荷１４３稼働時にはＮＦＢ１２６をメイクすることで一次電源を供給する。ダイオード１２７は、カソード側を１系一次電源入力端子１２２に設置することで、電流方向を負荷１４３から１系一次電源入力端子１２２へと一方向に固定する。１系一次電源入力端子１２２のプラス極側から負荷１４３の間には電流検出部１２８及び電流遮断部１３０が設置され、１系一次電源入力端子１２２のプラス側に流れる電流方向を電流検出部１２８内部のホール素子を用いて検知し、異常時には遮断制御信号１２９を出力する。電流遮断部１３０は、遮断制御信号１２９を入力すると内部のリレーをブレークして、そこに接続されている一次電源の遮断を行う。
【０００８】
次に、逆接防止回路の動作について説明する。
図１において、負荷１４３に供給する一次電源の片系である１系が逆接となった場合を仮定して説明する。１系一次電源入力端子１２２に１系一次電源１２１のマイナス極が接続されると、１系プラスライン１２４は事実上マイナス極となる。電流検出部１２８では、ホール素子を用い電流方向を検知する。ホール素子は外部からの磁界変化を直流電圧に変換するため、電流経路の近くに配置すればその経路に電流が流れた時に発生する磁界から、その電流方向や量を検知することが出来る。この検出方法については特開２０００−１７１５３８号公報で開示されているホールプローブ等を用いて実現可能である。これによりマイナス極が接続されると電流方向が正規な向きと逆になるため異常と判断し、遮断制御信号１２９を出力することとなる。電流遮断部１３０では、遮断制御信号１２９を入力すると、内部の動作状態を保持するラッチリレーをブレークさせ一次電源１２１の供給を遮断する。
電流遮断部１３０を復旧する場合には、０系一次電源１０１と１系一次電源１２１の電源供給を断ち、逆接した１系一次電源１２１を正規な接続に戻してから外部よりリセット信号１４５を送信することで、リレーをリセット（メイク）し接続を元の状態にする。この時リセット信号１４５はブレークしていない電流遮断部１１０へも送信されるが、元々メイクしているため無視されるので問題は無い。
【０００９】
上記の回路により一次電源入力に冗長構成を採用している機器において、一次電源の逆接を行った場合でも、装置内部の部品等を破損することなく、一次電源を遮断することが可能である。
なお、上記の動作の説明では、１系が逆接となった場合を仮定して説明したが、０系が逆接となった場合であっても同じように動作することは言うまでもない。また、実施形態の構成において、電流検出部と電流遮断部はプラスラインに、ＮＦＢとダイオードはマイナスラインにそれぞれ挿入する構成を述べたが、電流検出部と電流遮断部はマイナスラインに、ＮＦＢとダイオードはプラスラインに挿入しても同様の効果が得られる。ただし、ダイオードの極性の取り方は前者と後者とでは異なる。
【００１０】
【発明の効果】
以上説明したように本発明の逆接防止回路は、以下のような効果を奏する。
第１の効果は、部品の破損を回避することができることである。その理由は、従来技術では逆接防止手段としてヒューズを使用していたため、逆接の都度切断されたヒューズを交換しなくてはならなかったためである。
第２の効果は、ヒューズ切断時に発生する回収コストをなくすことができることである。その理由は、ヒューズは電源変換ユニットに内蔵しているため、逆接の都度、電源ユニットも同時に回収を行い破損部分が無いか検査する必要があったためである。
【図面の簡単な説明】
【図１】本発明の逆接防止回路を備えた電源回路のブロック図。
【図２】従来例の逆接防止回路を備えた電源回路のブロック図。
【符号の説明】
１０１０系一次電源
１０２０系一次電源入力端子
１０５、１２５電源変換ユニット
１０６ＮＦＢ
１０７ダイオード
１０８電流検出部
１０９遮断制御信号
１１０電流遮断部
１１２、１３２逆接防止回路
１２１１系一次電源
１２２１系一次電源入力端子
１２４１系プラスライン
１２６ＮＦＢ
１２７ダイオード
１２８電流検出部
１２９遮断制御信号
１３０電流遮断部
１４３負荷
１４５リセット信号
２０１０系一次電源
２０２０系一次電源入力端子
２０４０系プラスライン
２０５、２１５電源変換ユニット
２０６ＮＦＢ
２０７ダイオード
２０８ヒューズ
２０９、２１９二次変換部
２１１１系一次電源
２１３１系マイナスライン
２１４１系プラスライン
２１６ＮＦＢ
２１７ダイオード
２１８ヒューズ
２２２０、１系プラスライン
２２３負荷[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a reverse connection prevention circuit used for a device that inputs DC power, and more particularly to a reverse connection prevention circuit used for a mobile phone wireless base station device and the like.
[0002]
[Prior art]
In communication devices such as mobile radio base stations that require constant high reliability, a redundant configuration with two primary power input systems, such as 0 system and 1 system, is used to avoid service interruption due to power failure. are doing. When installing or relocating such a communication device, even if the primary power supply is connected with the wrong polarity, the primary power supply can be used in the device to prevent damage even if the primary power supply is connected incorrectly. Reverse connection prevention means is provided in the power supply conversion unit for producing the voltage source. The conventional reverse connection prevention means uses a fuse. In such a system, when one of the systems is normally connected and the other system is reversely connected, the fuse is cut, so that repair is costly to repair.
[0003]
FIG. 2 is a block diagram of a power supply circuit including a conventional reverse connection prevention circuit. In FIG. 2, a power supply 223 for a power supply such as a communication device is supplied in parallel with two power supplies of a 0-system primary power supply 201 and a 1-system primary power supply 211. The primary power supply is connected to the load via the power supply conversion units 205 and 215. The power supply conversion units 205 and 215 make a secondary power supply having a plurality of voltage values to be used in the apparatus from the primary power supply. , 219 and reverse connection prevention circuits 210, 220. In FIG. 2, the secondary converters 209 and 219 are not elements constituting the reverse connection prevention circuit, and are shown by broken lines.
In the conventional reverse connection prevention circuit, a non-fuse breaker (hereinafter abbreviated as NFB) NFB 206 and a diode 207 are installed between the negative pole side of the 0-system primary power input terminal 202 and the load 223, and the 0-system primary power input terminal 202 The fuse 208 is arranged between the positive pole side and the load 223.
The configuration of system 1 is the same as that of system 0. A non-fuse breaker (hereinafter, abbreviated as NFB) NFB 216 and a diode 217 are provided between the negative pole side of the primary primary power input terminal 212 and the load 223, and the load 223 is connected to the positive pole side of the primary primary power input terminal 212 from the positive pole side. A fuse 218 is provided between them.
When the load 223 is operated, power is supplied by making (short-circuiting) the NFB. The diodes 207 and 217 have their cathodes installed at the primary power input terminal, and fix the current direction in one direction from the load 223 to the primary power input terminal.
Now, as shown in FIG. 2, when the NFB 216 is made in a state where the positive electrode of the primary primary power supply 211 is erroneously connected to the primary negative line 213 of the primary primary power input terminal 212 and is reversely connected, if the NFB 216 is closed before the load. A current flows from the 0-system plus line 204 to the 1-system plus line 214 via the 0- and 1-system plus lines 222 connected by the, and the fuses 208 and 218 are thermally blown. When the fuse is blown, no reverse potential is applied to the load 223.
[0004]
[Problems to be solved by the invention]
However, the conventional reverse connection prevention circuit has a problem in that the fuse is blown and the repair is costly.
SUMMARY OF THE INVENTION It is an object of the present invention to provide a system in which a primary power supply input such as a mobile phone radio base station apparatus operates in a redundant configuration such as a 0 or 1 system, in which one of the inputs is erroneously connected in reverse (+ and-). In the event that the poles are connected in reverse), a reverse connection prevention circuit that can immediately detect this and shut off the power supply to prevent short-circuiting of the primary power supply and damage to components and devices can be prevented. is there.
[0005]
[Means for Solving the Problems]
A reverse connection prevention circuit according to claim 1 of the present invention is a power supply circuit connected to a DC primary power supply having positive and negative polarities to supply an electric load with the primary power supply and a secondary output generated from the primary power supply. In the above, the power supply circuit has a redundant configuration of a 0 system and a 1 system with respect to the load, and one of the two power supply circuits of the redundant configuration is reversely connected to the primary power supply with different polarities. When the input of the primary power supply to the load is interrupted, and when the reverse connection is released, the power supply circuit reconnects the primary power supply to the load by a reset signal externally input to the reverse connection prevention circuit. A reverse connection prevention circuit that prevents positive and negative input polarities from being erroneously connected to the primary power supply,
The reverse connection prevention circuit detects a current direction in a positive line connecting the primary power supply to the load, and a current detection unit that issues a current cutoff control signal when the current direction is abnormal; and the current detection unit. It is arranged in series, comprises a current cutoff means for cutting off the positive electrode line when receiving the current cutoff control signal, and reconnecting the positive electrode line when receiving the reset signal, in the negative electrode line, A breaker, a diode having a cathode terminal on the power supply side and an anode terminal on the load side are provided in series with the breaker, and the current cutoff means holds a connection state and an operation state of a cutoff state, and outputs the reset signal. At the time of reception, if the holding state is the cutoff state, the holding state is switched from the cutoff state to the connection state. If the holding state is the connection state, Wherein the switching of the holding state is latching relay is not performed.
The reverse connection prevention circuit according to the second aspect of the present invention is connected to a DC primary power supply having a positive polarity and a negative polarity and supplies an electric load with the primary power supply and a secondary output generated from the primary power supply. In the power supply circuit, the power supply circuit has a redundant configuration of 0 system and 1 system with respect to the load, and one of the two power supply circuits of the redundant configuration is connected in reverse to the primary power supply with different polarities. When performed, the power supply circuit interrupts the input of the primary power supply to the load, and when the reverse connection is released, reconnects the primary power supply to the load by a reset signal externally input to the reverse connection prevention circuit. A reverse connection prevention circuit for preventing the positive and negative input polarities from being erroneously connected to the primary power supply,
The reverse connection prevention circuit includes, in a positive line connecting the primary power supply to the load, a breaker, a diode having an anode terminal on the power supply side and a cathode terminal on the load side in series with the breaker, In the line, the current direction is detected, and a current detection unit that issues a current interruption control signal when the current direction is abnormal, and is arranged in series with the current detection unit, and when the current interruption control signal is received. Current interrupting means for interrupting the negative electrode line and reconnecting the negative electrode line when receiving the reset signal;
The current interrupting unit holds an operation state of a connection state and an interruption state, and when the reset state is received, if the holding state is the interruption state, switches the holding state from the interruption state to the connection state. If the holding state is the connection state, the latching relay does not switch the holding state .
Further, a reverse connection prevention circuit according to a third aspect of the present invention is characterized in that the current detecting means according to any one of the first and second aspects is a Hall element .
[0006]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of a reverse connection prevention circuit according to the present invention will be described with reference to the drawings.
FIG. 1 is a block diagram of a power supply circuit including one embodiment of a reverse connection prevention circuit according to the present invention. In FIG. 1, the primary power supply to the load 143 has a redundant configuration from the 0 primary power supply input terminal 102 and the 1 primary power supply input terminal 122. A secondary output is generated in the secondary conversion unit in the power conversion unit from the primary power input, and supplied to the load 143 together with the primary power. Reverse connection prevention circuit 112 is provided in the primary power supply line in power supply conversion units 105 and 125. In FIG. 1, the secondary conversion unit is not a component of the reverse connection prevention circuit, and is shown by a broken line.
[0007]
The configuration of the reverse connection prevention circuits 112 and 132 of the present invention will be described.
In the 0 system, the NFB 106 and the diode 107 are provided between the negative pole side of the primary power supply input terminal 102 and the load 143, and the primary power is supplied by making the NFB 106 when the load 143 operates. The diode 107 has a cathode fixed to the primary power supply input terminal 102 of the system 0, so that the current direction is fixed in one direction from the load 143 to the primary power supply input terminal 102 of the system 0. A current detector 108 and a current interrupter 110 are provided between the positive pole side of the 0-system primary power supply input terminal 102 and the load 143. The current detection unit 108 detects the direction of the current flowing to the positive side of the 0-system primary power supply input terminal 102 by using a Hall element inside the current detection unit 108, and outputs a cutoff control signal 109 when an abnormality occurs. When the cutoff control signal 109 is input, the current cutoff unit 110 breaks the internal relay and cuts off the primary power supply connected thereto.
Also in the first system, the NFB 126 and the diode 127 are provided between the negative pole side of the primary power supply input terminal 122 and the load 143, and the primary power is supplied by making the NFB 126 when the load 143 operates. The diode 127 has its cathode side installed at the primary primary power input terminal 122 to fix the current direction in one direction from the load 143 to the primary primary power input terminal 122. A current detecting unit 128 and a current interrupting unit 130 are provided between the positive pole side of the primary primary power input terminal 122 and the load 143, and the current flowing to the positive side of the primary primary power input terminal 122 is detected by the current detecting unit 128. Detection is performed using an internal Hall element, and a shutoff control signal 129 is output when an abnormality occurs. When the cutoff control signal 129 is input, the current cutoff unit 130 breaks the internal relay and cuts off the primary power supply connected thereto.
[0008]
Next, the operation of the reverse connection prevention circuit will be described.
In FIG. 1, a description will be given assuming that one system, which is one system of the primary power supply supplied to the load 143, is connected in reverse. When the negative pole of the primary primary power supply 121 is connected to the primary primary power supply input terminal 122, the primary positive line 124 is effectively a negative pole. The current detector 128 detects the current direction using a Hall element. Since the Hall element converts a magnetic field change from the outside into a DC voltage, if it is arranged near a current path, the direction and amount of the current can be detected from a magnetic field generated when a current flows through the path. This detection method can be realized using a hole probe or the like disclosed in JP-A-2000-171538. As a result, when the negative pole is connected, the current direction is opposite to the normal direction, so that it is determined that there is an abnormality, and the cutoff control signal 129 is output. When the cutoff control signal 129 is input, the current cutoff unit 130 breaks the latch relay that holds the internal operation state and cuts off the supply of the primary power supply 121.
When the current interrupting unit 130 is to be restored, the power supply to the system 0 primary power supply 101 and the system 1 primary power supply 121 is cut off, the reverse connection of the system 1 primary power supply 121 is returned to a normal connection, and then a reset signal 145 is transmitted from outside. Resets (makes) the relay and restores the connection to its original state. At this time, the reset signal 145 is also transmitted to the current interrupting unit 110 that has not been broken, but there is no problem since it is ignored since it is originally made.
[0009]
With the above-described circuit, in a device employing a redundant configuration for the primary power supply input, even if the primary power supply is reversely connected, it is possible to cut off the primary power supply without damaging components inside the device.
In the above description of the operation, the description has been made on the assumption that the system 1 has a reverse connection, but it goes without saying that the same operation is performed even when the system 0 has a reverse connection. Further, in the configuration of the embodiment, the configuration is described in which the current detection unit and the current cutoff unit are inserted into the plus line, and the NFB and the diode are inserted into the minus line, respectively. The same effect can be obtained by inserting a diode in the plus line. However, the polarity of the diode is different between the former and the latter.
[0010]
【The invention's effect】
As described above, the reverse connection prevention circuit of the present invention has the following effects.
The first effect is that damage to components can be avoided. The reason is that the fuse is used as the reverse connection prevention means in the related art, so that the blown fuse must be replaced every time the reverse connection is made.
The second effect is that the recovery cost generated when the fuse is cut can be eliminated. The reason is that, since the fuse is built in the power supply conversion unit, it is necessary to collect the power supply unit at the same time of reverse connection and to inspect for a damaged portion.
[Brief description of the drawings]
FIG. 1 is a block diagram of a power supply circuit including a reverse connection prevention circuit according to the present invention.
FIG. 2 is a block diagram of a power supply circuit including a conventional reverse connection prevention circuit.
[Explanation of symbols]
101 0 system primary power supply 102 0 system primary power supply input terminal 105, 125 power supply conversion unit 106 NFB
107 Diode 108 Current detection unit 109 Cutoff control signal 110 Current cutoff unit 112, 132 Reverse connection prevention circuit 121 1st system primary power supply 122 1st system primary power supply input terminal 124 1st system plus line 126 NFB
127 Diode 128 Current detection unit 129 Cutoff control signal 130 Current cutoff unit 143 Load 145 Reset signal 201 System 0 primary power supply 202 System 0 primary power supply input terminal 204 System 0 plus line 205, 215 Power supply conversion unit 206 NFB
207 Diode 208 Fuse 209, 219 Secondary conversion unit 211 1st system primary power supply 213 1st system minus line 214 1st system plus line 216 NFB
217 Diode 218 Fuse 222 0, 1 system plus line 223 Load

Claims

In a power supply circuit connected to a DC primary power supply having a positive polarity and a negative polarity and supplying a secondary output generated from the primary power supply and the primary power supply to an electric load, the power supply circuit has a 0 system with respect to the load, and When a reverse connection having a different polarity is performed on one of the two power supply circuits of the redundant configuration with respect to the primary power supply, the input of the primary power supply to the load is cut off, When the reverse connection is released, the power supply circuit for reconnecting the primary power supply to the load by a reset signal externally input to the reverse connection prevention circuit may be connected to the primary power supply by mistake in the positive and negative input polarities. A reverse connection prevention circuit for preventing
The reverse connection prevention circuit,
In the positive line connecting the primary power supply to the load, a current detection means for detecting a current direction, and issuing a current cutoff control signal when the current direction is abnormal, arranged in series with the current detection means, When the current cutoff control signal is received, the positive line is cut off, and when the reset signal is received, a current cutoff unit that reconnects the positive line is provided.
In the negative electrode line, a breaker and a diode having a cathode terminal on the power supply side and an anode terminal on the load side are provided in series with the breaker,
The current interrupting unit holds an operation state of a connection state and an interruption state, and when the reset state is received, if the holding state is the interruption state, switches the holding state from the interruption state to the connection state. The reverse connection prevention circuit, wherein the latching relay does not switch the holding state if the holding state is the connection state .

In a power supply circuit connected to a DC primary power supply having a positive polarity and a negative polarity and supplying a secondary output generated from the primary power supply and the primary power supply to an electric load, the power supply circuit has a 0 system with respect to the load, and When one of the two power supply circuits of the redundant configuration has a reverse connection of a different polarity to the primary power supply, the input of the primary power supply to the load is cut off, When the reverse connection is released, the power supply circuit for reconnecting the primary power supply to the load by a reset signal input from the outside to the reverse connection prevention circuit is connected to the primary power supply by mistake in the positive and negative input polarities. A reverse connection prevention circuit for preventing
The reverse connection prevention circuit,
In the positive line connecting the primary power supply to the load, a breaker, an anode terminal on the power supply side, and a diode having a cathode terminal on the load side are provided in series with the breaker,
In the negative electrode line, a current detection unit that detects a current direction and issues a current interruption control signal when the current direction is abnormal, is arranged in series with the current detection unit, and receives the current interruption control signal. In the case, a current cutoff means for shutting off the negative electrode line and reconnecting the negative electrode line when receiving the reset signal,
The current interrupting unit holds an operating state of a connection state and an interruption state, and when the reset state is received, if the holding state is the interruption state, switches the holding state from the interruption state to the connection state. A reverse connection prevention circuit, wherein the latching relay does not switch the holding state if the holding state is the connection state.

The current detecting means is a Hall element
3. The reverse connection prevention circuit according to claim 1, wherein: