JPH05276646A - Electronic appliance - Google Patents

Electronic appliance

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Publication number
JPH05276646A
JPH05276646A JP6502092A JP6502092A JPH05276646A JP H05276646 A JPH05276646 A JP H05276646A JP 6502092 A JP6502092 A JP 6502092A JP 6502092 A JP6502092 A JP 6502092A JP H05276646 A JPH05276646 A JP H05276646A
Authority
JP
Japan
Prior art keywords
overcurrent
circuit
operating current
detection level
protective 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.)
Granted
Application number
JP6502092A
Other languages
Japanese (ja)
Other versions
JP3224262B2 (en
Inventor
Yushi Nezu
祐志 根津
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Canon Inc
Original Assignee
Canon Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Canon Inc filed Critical Canon Inc
Priority to JP06502092A priority Critical patent/JP3224262B2/en
Publication of JPH05276646A publication Critical patent/JPH05276646A/en
Application granted granted Critical
Publication of JP3224262B2 publication Critical patent/JP3224262B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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  • Emergency Protection Circuit Devices (AREA)

Abstract

PURPOSE:To operate an overcurrent protective circuit positively by storing the relationship between predetermined operation modes and operating current values of overcurrent protective circuit in the form of a table, reading out an operating current from a storing means depending on an operating mode being set, and then setting an operating current value in the overcurrent protective circuit. CONSTITUTION:Upon voltage supply from a power supply circuit 1, a CPU 3 functions to execute a program stored in a ROM 4 and provides a display on an LCD. At that time, overcurrent detection level of an overcurrent detector 2 is set at a normal state I2. When printing is carried out upon receiving an operation mode from a keyboard 6, the CPU 3 sets the overcurrent detection level of the overcurrent detector 2 at level I3 prior to printing and subsequently resets the overcurrent detection level at I2 upon finish of printing. When an abnormality takes place subsequently in the circuit, current is doubled as compared with normal operation and the overcurrent detection level I2 is exceeded. Consequently the overcurrent detector 2 functions to cause function of an overcurrent protective circuit 1a resulting in shutdown of the power supply circuit 1.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【産業上の利用分野】本発明は、過電流保護回路を有す
る電子機器に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic device having an overcurrent protection circuit.

【０００２】[0002]

【従来の技術】従来、電子機器の過電流保護回路は、電
子機器の通常動作時の最大消費電流を超えた場合、動作
するように構成されている。2. Description of the Related Art Conventionally, an overcurrent protection circuit for an electronic device is configured to operate when the maximum current consumption of the electronic device during normal operation is exceeded.

【０００３】[0003]

【発明が解決しようとする課題】しかしながら、動作モ
ードによって大幅に消費電流が変化するような電子機器
においては、最大消費電流となる動作モードに合わせて
過電流の検出値を設定せざるをえなかった。また、非常
にまれにしか最大消費電流動作をしない機器の場合、通
常動作の消費電流の低い時に、回路異常が生じて消費電
流が増えても、過電流保護回路が動作しないという問題
点があった。However, in an electronic device in which the current consumption greatly changes depending on the operation mode, the overcurrent detection value must be set in accordance with the operation mode in which the maximum current consumption is achieved. It was In addition, in the case of a device that operates at the maximum current consumption very rarely, there is a problem that the overcurrent protection circuit does not operate even if a circuit error occurs and the current consumption increases when the current consumption at normal operation is low. It was

【０００４】本発明の目的は、上記のような問題点を解
決し、過電流保護回路をより確実に作動させることがで
きる電子機器を提供することにある。An object of the present invention is to solve the above problems and to provide an electronic device capable of operating an overcurrent protection circuit more reliably.

【０００５】[0005]

【課題を解決するための手段】このような目的を達成す
るために、本発明は、過電流保護回路を有する電子機器
において、予め定めた動作モードと過電流保護回路の作
動電流値との関係をテーブルとして格納した格納手段
と、設定された動作モードに応じて前記格納手段から作
動電流値を読み出し、該作動電流値を前記過電流保護回
路に設定する設定手段とを備えたことを特徴とする。In order to achieve such an object, the present invention provides a relationship between a predetermined operation mode and an operating current value of an overcurrent protection circuit in an electronic device having an overcurrent protection circuit. Is stored as a table, and a setting means for reading an operating current value from the storing means according to a set operation mode and setting the operating current value in the overcurrent protection circuit. To do.

【０００６】[0006]

【作用】本発明では、予め定めた動作モードと過電流保
護回路の作動電流値をテーブルとして格納した格納手段
から、設定された動作モードに応じて設定手段により作
動電流値を読み出し、作動電流値を過電流保護回路に設
定する。According to the present invention, the operating current value is read out by the setting means in accordance with the set operation mode from the storing means which stores the predetermined operating mode and the operating current value of the overcurrent protection circuit as a table. Is set in the overcurrent protection circuit.

【０００７】[0007]

【実施例】以下、本発明の実施例を図面を参照して詳細
に説明する。Embodiments of the present invention will now be described in detail with reference to the drawings.

【０００８】図１は本発明の一実施例を示す。FIG. 1 shows an embodiment of the present invention.

【０００９】図１において、１は過電流保護回路１ａを
有する電源回路、２は検出点を設定できる過電流検出
器、３は全体を制御するＣＰＵ、４は制御プログラム
と、予め定めた動作モードと作動電流値（過電流検出
値）との関係をテーブルとして格納してあるＲＯＭ、５
はデータを保持しておくＲＡＭ、６はデータ入力をする
ためのキーボード、７は表示器としてのＬＣＤ、８は印
刷を行うプリンタである。In FIG. 1, 1 is a power supply circuit having an overcurrent protection circuit 1a, 2 is an overcurrent detector capable of setting a detection point, 3 is a CPU for controlling the whole, 4 is a control program, and a predetermined operation mode. ROM that stores the relationship between the operating current value (overcurrent detection value) as a table, 5
Is a RAM for holding data, 6 is a keyboard for inputting data, 7 is an LCD as a display, and 8 is a printer for printing.

【００１０】次に、動作を説明する。Next, the operation will be described.

【００１１】電源を投入すると、電源回路１から電圧が
供給され、ＣＰＵ３が働き出し、ＲＯＭ４のプログラム
を実行し、ＬＣＤ７に表示を行う。この時は、過電流検
出器２の過電流検出値を図２のの通常状態Ｉ2 にセッ
トしておく。When the power is turned on, a voltage is supplied from the power supply circuit 1, the CPU 3 starts to work, the program in the ROM 4 is executed, and the LCD 7 displays. At this time, the overcurrent detection value of the overcurrent detector 2 is set to the normal state I 2 of FIG.

【００１２】例えば、キーボード６からの動作モード入
力で印刷を行う場合、ＣＰＵ３は予め過電流検出器２の
過電流検出値を図２のＩ3 のレベルに設定してから印刷
を行い、終了時に、過電流検出値を再びＩ2 に設定し直
す。For example, when printing is performed by inputting the operation mode from the keyboard 6, the CPU 3 sets the overcurrent detection value of the overcurrent detector 2 to the level of I 3 in FIG. , Reset the overcurrent detection value to I 2 again.

【００１３】その後、回路に異常が起き、通常動作時に
比較して電流が倍に増えた場合、過電流検出点のＩ2 を
超えるため、過電流検出器２が動作して過電流保護回路
１ａが働き、電源回路１をシャットダウンする。After that, when an abnormality occurs in the circuit and the current doubles as compared with that in the normal operation, the current exceeds I 2 at the overcurrent detection point, so the overcurrent detector 2 operates and the overcurrent protection circuit 1a. Works and shuts down the power supply circuit 1.

【００１４】従来の回路では、常に、過電流検出値をＩ
3 に固定してあるため上記のような場合異常を検出でき
なかった。In the conventional circuit, the overcurrent detection value is always I
Since it is fixed at 3 , no abnormality could be detected in the above cases.

【００１５】[0015]

【発明の効果】以上説明したように、本発明によれば、
動作モードによって過電流保護回路の作動電流値を変え
るようにしたので、消費電流の少ない動作を行っている
場合でも、回路に異常が生じた場合確実に異常を検出で
きる。As described above, according to the present invention,
Since the operating current value of the overcurrent protection circuit is changed depending on the operation mode, even when an operation with a small current consumption is performed, it is possible to reliably detect the abnormality when a circuit abnormality occurs.

【図面の簡単な説明】[Brief description of drawings]

【図１】本発明の一実施例を示すブロック図である。FIG. 1 is a block diagram showing an embodiment of the present invention.

【図２】動作モードによる消費電流と過電流検出値の関
係の一例を示す図である。FIG. 2 is a diagram showing an example of a relationship between a consumption current and an overcurrent detection value depending on an operation mode.

【符号の説明】[Explanation of symbols]

１ 電源回路 １ａ 過電流保護回路 ２ 過電流検出器 ３ ＣＰＵ ４ ＲＯＭ ５ ＲＡＭ ６ キーボード ７ ＬＣＤ ８ プリンタ 1 Power Supply Circuit 1a Overcurrent Protection Circuit 2 Overcurrent Detector 3 CPU 4 ROM 5 RAM 6 Keyboard 7 LCD 8 Printer

Claims (1)

【特許請求の範囲】[Claims] 【請求項１】 過電流保護回路を有する電子機器におい
て、 予め定めた動作モードと過電流保護回路の作動電流値と
の関係をテーブルとして格納した格納手段と、 設定された動作モードに応じて前記格納手段から作動電
流値を読み出し、該作動電流値を前記過電流保護回路に
設定する設定手段とを備えたことを特徴とする電子機
器。1. In an electronic device having an overcurrent protection circuit, a storage means for storing a relationship between a predetermined operation mode and an operating current value of the overcurrent protection circuit as a table, and the storage device according to the set operation mode. An electronic device comprising: a setting unit that reads an operating current value from a storage unit and sets the operating current value in the overcurrent protection circuit.
JP06502092A 1992-03-23 1992-03-23 Electronic equipment and control method Expired - Fee Related JP3224262B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP06502092A JP3224262B2 (en) 1992-03-23 1992-03-23 Electronic equipment and control method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP06502092A JP3224262B2 (en) 1992-03-23 1992-03-23 Electronic equipment and control method

Publications (2)

Publication Number Publication Date
JPH05276646A true JPH05276646A (en) 1993-10-22
JP3224262B2 JP3224262B2 (en) 2001-10-29

Family

ID=13274878

Family Applications (1)

Application Number Title Priority Date Filing Date
JP06502092A Expired - Fee Related JP3224262B2 (en) 1992-03-23 1992-03-23 Electronic equipment and control method

Country Status (1)

Country Link
JP (1) JP3224262B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1517523A1 (en) * 2003-09-18 2005-03-23 Nec Corporation Abnormal current determining method, electronic apparatus, and computer program of same
JP2009136080A (en) * 2007-11-29 2009-06-18 Kyocera Corp Portable electronic apparatus

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1517523A1 (en) * 2003-09-18 2005-03-23 Nec Corporation Abnormal current determining method, electronic apparatus, and computer program of same
US7274548B2 (en) 2003-09-18 2007-09-25 Nec Corporation Abnormal current determining method, electronic apparatus, and computer program of same
CN100424954C (en) * 2003-09-18 2008-10-08 日本电气株式会社 Abnormal current determining method, electronic apparatus, and computer program of same
JP2009136080A (en) * 2007-11-29 2009-06-18 Kyocera Corp Portable electronic apparatus

Also Published As

Publication number Publication date
JP3224262B2 (en) 2001-10-29

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