JP4717043B2 - Load drive circuit - Google Patents

Load drive circuit Download PDF

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JP4717043B2
JP4717043B2 JP2007259133A JP2007259133A JP4717043B2 JP 4717043 B2 JP4717043 B2 JP 4717043B2 JP 2007259133 A JP2007259133 A JP 2007259133A JP 2007259133 A JP2007259133 A JP 2007259133A JP 4717043 B2 JP4717043 B2 JP 4717043B2
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一夫 神内
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アール・ビー・コントロールズ株式会社
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Description

本発明は、並列に接続された複数の負荷に電力を供給する電源を備えると共に、各負荷の作動を制御する制御部とを備えた負荷駆動回路に関する。   The present invention relates to a load drive circuit including a power source that supplies power to a plurality of loads connected in parallel and a control unit that controls the operation of each load.

従来よりこの種の負荷駆動回路では、１つの電源に複数の負荷を並列に接続し、電源から各負荷に対して駆動用の電力を供給するように構成されている。また、制御部が設けられており、各負荷の作動はこの制御部によって行われる。このような構成による負荷駆動回路ではいずれかの負荷に短絡故障が生じると、電源の出力電流値が増加したり、出力電圧が低下して負荷のいずれかに短絡故障が生じたことが検知できる。   Conventionally, this type of load drive circuit is configured to connect a plurality of loads in parallel to one power source and to supply driving power from the power source to each load. Moreover, the control part is provided and the action | operation of each load is performed by this control part. In the load driving circuit having such a configuration, when a short circuit failure occurs in any load, it can be detected that the output current value of the power source increases or the output voltage decreases to cause a short circuit failure in any of the loads. .

ところが、いずれの負荷に短絡故障が生じたかを特定する必要があるため、各負荷に過電流検出部を各々１個ずつ設けて、短絡故障が生じた負荷に設けられている過電流検出部からの信号により、短絡故障の発生した負荷を特定するように構成したものが知られている（例えば、特許文献１参照）。
特開２００３−３２４８４０号公報（図１） However, since it is necessary to specify which load the short-circuit failure has occurred, one overcurrent detection unit is provided for each load, and the overcurrent detection unit provided in the load in which the short-circuit failure has occurred. There is known a configuration in which a load in which a short-circuit failure has occurred is specified by the above signal (see, for example, Patent Document 1).
JP 2003-324840 A (FIG. 1)

上記従来の負荷駆動回路では過電流検出部を全ての負荷に１つずつ設けているので、短絡故障が生じた負荷を特定することはできるものの、負荷毎に過電流検出部を設けなければならず、回路全体が煩雑になるばかりかコストが高くなるという不具合が生じる。   In the above conventional load drive circuit, since one overcurrent detection unit is provided for each load, it is possible to identify a load in which a short circuit failure has occurred, but an overcurrent detection unit must be provided for each load. In addition, the entire circuit becomes complicated and the cost increases.

そこで本発明は、上記の問題点に鑑み、各負荷に各々短絡故障が生じたことを検出する検出部を設けることなく、短絡故障の発生した負荷を特定することのできる負荷駆動回路を提供することを課題とする。 In view of the above problems, the present invention provides a load drive circuit that can identify a load in which a short-circuit fault has occurred without providing a detection unit that detects that a short-circuit fault has occurred in each load. This is the issue.

上記課題を解決するために本発明による負荷駆動回路は、並列に接続された複数の負荷に電力を供給する電源を備えると共に、各負荷の作動を制御する制御部を備え、負荷のいずれかに短絡故障が生じると制御部が強制的に初期化される負荷駆動回路において、上記制御部は上記電源から作動電力の供給を受けており、制御部に不揮発性のメモリを接続し、負荷を作動させる際にその負荷を特定できる情報を不揮発メモリに書き込んだ後、短絡故障による初期化がされなければ所定時間経過後にその情報を消去し、さらに上記短絡故障による初期化後の作動再開時に不揮発メモリ内に残存する情報から短絡故障が発生した負荷を特定する故障特定手段を制御部に設けたことを特徴とする。 Load driving circuit that by the present invention to solve the above SL problems is provided with a power source for supplying power to a plurality of loads connected in parallel, a control unit for controlling the operation of each load, load In a load drive circuit in which the control unit is forcibly initialized when a short circuit failure occurs in any of the above, the control unit is supplied with operating power from the power source, and a non-volatile memory is connected to the control unit. After the information that can identify the load when operating the load is written in the nonvolatile memory, if the initialization is not performed due to a short circuit failure , the information is erased after a predetermined time, and the operation after the initialization due to the short circuit failure The controller is provided with a failure specifying means for specifying a load in which a short circuit failure has occurred from information remaining in the nonvolatile memory at the time of restart.

この負荷駆動回路では制御部の作動電力を電源から供給されるように構成し、さらに負荷にいずれかに短絡故障が生じた場合に、制御部が初期化されるほどに電源の電圧が低下する場合が生じる。負荷に短絡故障が生じていない正常時には、負荷を作動させる際にその負荷を特定できる情報を不揮発メモリに記憶させる。負荷に短絡故障が生じていないので電源の電圧は低下せず、従って制御部は初期化されることはない。その負荷が作動して所定時間経過すれば負荷の情報を消去する。すなわち、負荷に短絡故障が生じなければ不揮発メモリの情報は消去される。ところが負荷に短絡故障が生じると、その短絡故障が生じた負荷を作動させたとたんに電源の電圧が低下し、不揮発メモリ内の情報を消去する前に制御部は初期化される。この初期化後、再起動した際に不揮発メモリ内の情報を読み取れば、どの負荷を作動させたあとに初期化されたかがわかり、その負荷を短絡故障が発生した負荷と特定することができる。   In this load driving circuit, the operating power of the control unit is configured to be supplied from the power source, and when a short circuit failure occurs in any of the loads, the voltage of the power source decreases as the control unit is initialized. Cases arise. When the load is in a normal state where no short-circuit failure has occurred, information that can identify the load when the load is operated is stored in the nonvolatile memory. Since no short-circuit fault has occurred in the load, the voltage of the power supply does not decrease, and therefore the control unit is not initialized. If the load is activated and a predetermined time elapses, the load information is deleted. That is, the information in the nonvolatile memory is erased if no short circuit failure occurs in the load. However, when a short circuit failure occurs in the load, the voltage of the power supply decreases as soon as the load in which the short circuit failure has occurred is activated, and the control unit is initialized before erasing information in the nonvolatile memory. If the information in the nonvolatile memory is read when the system is restarted after the initialization, it is possible to know which load is initialized after the operation, and the load can be identified as the load in which the short-circuit fault has occurred.

以上の説明から明らかなように、本発明は、各負荷には短絡故障が発生したことを検知する回路等を各々追加することなく、短絡故障が発生した負荷を特定することができるので、負荷駆動回路が煩雑にならず、かつ負荷駆動回路のコストを従来のものより安くすることができる。   As is clear from the above description, the present invention can identify the load in which the short-circuit fault has occurred without adding a circuit or the like for detecting that a short-circuit fault has occurred in each load. The drive circuit is not complicated, and the cost of the load drive circuit can be made cheaper than the conventional one.

図１を参照して、１は電源であり、複数の負荷２に供給する１２ボルトの負荷電源とマイコンからなる制御部３に供給する５ボルトの制御回路電源とを備えている。この電源１に接続されている負荷２は例えばモータやソレノイドコイル等から構成されている。また、制御部３内にはこれら負荷２を個別に作動制御するための負荷駆動制御部３１が内蔵されており、この負荷駆動制御部３１からの信号により負荷２に作動用の電力を供給するためのスイッチがオンオフ制御される。各負荷２の作動状態は表示器３３により表示されるが、この表示器３３は制御部３内の表示器駆動部３２によって駆動される。   Referring to FIG. 1, reference numeral 1 denotes a power source, which includes a 12 volt load power source supplied to a plurality of loads 2 and a 5 volt control circuit power source supplied to a control unit 3 composed of a microcomputer. The load 2 connected to the power source 1 is composed of, for example, a motor or a solenoid coil. Further, a load drive control unit 31 for individually controlling the operation of these loads 2 is built in the control unit 3, and operation power is supplied to the load 2 by a signal from the load drive control unit 31. The on / off switch is controlled. The operating state of each load 2 is displayed by a display device 33, and this display device 33 is driven by a display device drive unit 32 in the control unit 3.

電源１の負荷電源の電圧は電源電圧監視回路４により常時モニターされており、そのモニターされた電圧値は制御部３内の電源電圧低下検出部４１に入力される。この電源電圧低下検出部４１はいずれかの負荷２に短絡故障が生じた際の負荷電源の電圧降下値が設定されており、電源電圧監視回路４がモニターしている負荷電源の電圧がその電源降下値より低下すると、負荷２のいずれかに短絡故障が生じたものとして負荷駆動制御部３１に信号を出力する。   The voltage of the load power source of the power source 1 is constantly monitored by the power source voltage monitoring circuit 4, and the monitored voltage value is input to the power source voltage drop detecting unit 41 in the control unit 3. The power supply voltage drop detection unit 41 is set with a voltage drop value of the load power supply when a short circuit failure occurs in any one of the loads 2, and the voltage of the load power supply monitored by the power supply voltage monitoring circuit 4 is the power supply. When the value falls below the drop value, a signal is output to the load drive control unit 31 as a short circuit failure has occurred in any of the loads 2.

負荷駆動制御部３１は電源電圧低下検出部４１からの信号を受信すると、直ちに全ての負荷２を停止させる。そしてその後、負荷２を１つずつ順次作動させていく。作動させる負荷に短絡故障が生じていない場合には負荷電源の電圧が低下しないが、作動させた負荷２が短絡故障している場合には、負荷電源の電圧が低下するので、どの負荷２に短絡故障が生じているかを特定することができる。短絡故障している負荷２を特定すればエラー表示と共にどの負荷２に短絡故障が生じているかの旨を表示器３３に表示させる。なお、負荷電源の電圧が低下した際に制御回路電源の電圧も大幅に低下し、制御部３が初期化されるとどの負荷２に欄酪故障が生じていたかのデータが消失するので、制御回路電源の電圧が低下してもしばらくの間電圧が降下しないようにコンデンサ３４を制御部３に並列に接続した。   When receiving the signal from the power supply voltage drop detection unit 41, the load drive control unit 31 immediately stops all the loads 2. Thereafter, the loads 2 are sequentially operated one by one. The load power supply voltage does not decrease when the operated load is not short-circuited. However, when the operated load 2 is short-circuited, the load power supply voltage is decreased. It is possible to specify whether a short-circuit fault has occurred. If the load 2 having a short-circuit failure is specified, an error display is displayed together with an indication of which load 2 has a short-circuit failure. In addition, when the voltage of the load power supply is lowered, the voltage of the control circuit power supply is also greatly lowered. When the control unit 3 is initialized, data indicating which load 2 has a column failure has been lost. A capacitor 34 was connected in parallel to the control unit 3 so that the voltage did not drop for a while even if the voltage of the power supply dropped.

短絡故障した負荷を特定することは他の回路構成でも実現することができる。例えば、図２を参照して、制御部３にＥＥＰＲＯＭなどの不揮発性記憶装置５を接続し、制御部３内の記憶装置制御部５１を介して情報を不揮発性記憶装置５に書き込み、および消去できるようにしてもよい。   Specifying a load that has a short-circuit fault can also be realized with other circuit configurations. For example, referring to FIG. 2, a nonvolatile storage device 5 such as an EEPROM is connected to the control unit 3, and information is written to and erased from the nonvolatile storage device 5 via the storage device control unit 51 in the control unit 3. You may be able to do it.

この図２に示した構成では、負荷駆動制御部３１はいずれかの負荷２の作動を開始する際に同時にその作動を開始する負荷２を特定できる情報、例えば負荷２毎に異なる番号を付与したＩＤを不揮発性記憶装置５に書き込む。その負荷２が作動を開始して所定時間経過すると、書き込んだ情報を消去する。この状態で制御部３が手動操作等の人為的に初期化された場合、次に再起動する際に最初に不揮発性記憶装置５の記憶内容を読みに行くようにした。負荷２に短絡故障が発生していなければ不揮発性記憶装置５には情報が記憶されていないので、通常の制御を開始する。   In the configuration shown in FIG. 2, when the operation of any load 2 is started, the load drive control unit 31 assigns information that can identify the load 2 that starts the operation simultaneously, for example, a different number for each load 2. The ID is written into the nonvolatile storage device 5. When the load 2 starts operating and a predetermined time elapses, the written information is erased. In this state, when the control unit 3 is artificially initialized by manual operation or the like, the stored contents of the nonvolatile storage device 5 are read first when the computer is restarted next time. If no short-circuit failure has occurred in the load 2, no information is stored in the nonvolatile storage device 5, so normal control is started.

ところが、負荷２の作動を開始した際にその負荷２に短絡故障が生じていると、不揮発性記憶装置５には作動開始時点でその負荷２を特定する情報が書き込まれるが、負荷電源と共に制御回路電源の電圧が低下して、不揮発性記憶装置５内のデータが消去される前に制御部３は強制的に初期化される。初期化後の再起同時には不揮発性記憶装置５を読みに行くが、そこには短絡故障が生じた負荷２を特定する情報が消去されずに残っている。   However, if a short circuit failure occurs in the load 2 when the operation of the load 2 is started, information for specifying the load 2 is written in the nonvolatile storage device 5 at the time of starting the operation. The control unit 3 is forcibly initialized before the voltage of the circuit power supply decreases and the data in the nonvolatile memory device 5 is erased. At the same time as the restart after the initialization, the nonvolatile memory device 5 is read, but information specifying the load 2 in which the short-circuit fault has occurred remains without being erased.

制御部３は不揮発性記憶装置５に情報が残っている場合には、その情報から特定される負荷２に短絡故障が生じていると判断してその旨を表示器３３に表示させる。   When information remains in the nonvolatile storage device 5, the control unit 3 determines that a short-circuit failure has occurred in the load 2 specified from the information and causes the display 33 to display that fact.

なお、本発明は上記した形態に限定されるものではなく、本発明の要旨を逸脱しない範囲内において種々の変更を加えてもかまわない。   In addition, this invention is not limited to an above-described form, You may add a various change in the range which does not deviate from the summary of this invention.

本発明の第１の実施の形態の構成を示す図The figure which shows the structure of the 1st Embodiment of this invention. 本発明の第２の実施の形態の構成を示す図The figure which shows the structure of the 2nd Embodiment of this invention.

符号の説明Explanation of symbols

１ 電源
２ 負荷
３ 制御部
４ 電源電圧監視回路
５ 不揮発性記憶装置
３４ コンデンサ DESCRIPTION OF SYMBOLS 1 Power supply 2 Load 3 Control part 4 Power supply voltage monitoring circuit 5 Non-volatile memory device 34 Capacitor

Claims (1)

並列に接続された複数の負荷に電力を供給する電源を備えると共に、各負荷の作動を制御する制御部を備え、負荷のいずれかに短絡故障が生じると制御部が強制的に初期化される負荷駆動回路において、上記制御部は上記電源から作動電力の供給を受けており、制御部に不揮発性のメモリを接続し、負荷を作動させる際にその負荷を特定できる情報を不揮発メモリに書き込んだ後、短絡故障による初期化がされなければ所定時間経過後にその情報を消去し、さらに上記短絡故障による初期化後の作動再開時に不揮発メモリ内に残存する情報から短絡故障が発生した負荷を特定する故障特定手段を制御部に設けたことを特徴とする負荷駆動回路。 A power supply for supplying power to a plurality of loads connected in parallel and a control unit for controlling the operation of each load are provided , and the control unit is forcibly initialized when a short circuit fault occurs in any of the loads. In the load driving circuit, the control unit is supplied with operating power from the power source, and a non-volatile memory is connected to the control unit, and information for specifying the load when the load is operated is written in the non-volatile memory. after, erase the information after a predetermined to be the initialization by the short circuit fault time, further short circuit fault from the information remaining in the nonvolatile memory to identify the load generated in the operation resuming after the initialization by the short-circuit failure A load driving circuit characterized in that a failure specifying means is provided in a control unit.
JP2007259133A 2007-10-02 2007-10-02 Load drive circuit Active JP4717043B2 (en)

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