JPS6288489U - - Google Patents

Info

Publication number
JPS6288489U
JPS6288489U JP1985178441U JP17844185U JPS6288489U JP S6288489 U JPS6288489 U JP S6288489U JP 1985178441 U JP1985178441 U JP 1985178441U JP 17844185 U JP17844185 U JP 17844185U JP S6288489 U JPS6288489 U JP S6288489U
Authority
JP
Japan
Prior art keywords
emitter follower
follower transistor
motor
polarity
protection diode
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.)
Pending
Application number
JP1985178441U
Other languages
Japanese (ja)
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 filed Critical
Priority to JP1985178441U priority Critical patent/JPS6288489U/ja
Publication of JPS6288489U publication Critical patent/JPS6288489U/ja
Pending legal-status Critical Current

Links

Description

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は、本考案の一実施例を示す回路図、及
び第２図は従来のモータ駆動回路を示す回路図で
ある。 主な図番の説明、１……モータ、２，３，４…
…抵抗、６……比較回路、７……エミツタフオロ
アトランジスタ、１２，１３，１４，１５……寄
生ダイオード、１８……保護ダイオード。 FIG. 1 is a circuit diagram showing an embodiment of the present invention, and FIG. 2 is a circuit diagram showing a conventional motor drive circuit. Explanation of main drawing numbers, 1...Motor, 2, 3, 4...
...Resistor, 6... Comparison circuit, 7... Emitter follower transistor, 12, 13, 14, 15... Parasitic diode, 18... Protection diode.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] モータの両端がそれぞれ接続される第１及び第
２端子と、該第１及び第２端子間に直列接続され
る複数の抵抗と、前記モータの回転速度に応じて
発生する電圧と基準電圧とを比較し、制御信号を
発生する比較回路と、該比較回路の出力端にベー
スが接続されたエミツタフオロアトランジスタと
、該エミツタフオロアトランジスタの出力信号に
応じて前記複数の抵抗及び前記モータに流れる電
流を制御する制御トランジスタとを備えるＩＣ化
されたモータ駆動回路において、前記エミツタフ
オロアトランジスタのコレクタと前記第１端子と
の間に保護ダイオードを接続し、該保護ダイオー
ドの極性を前記エミツタフオロアトランジスタの
コレクタとＩＣのサブストレートとの間に生じる
寄生ダイオードの極性と逆にしたことを特徴とす
るモータ駆動回路の保護回路。 first and second terminals connected to both ends of the motor, a plurality of resistors connected in series between the first and second terminals, a voltage generated according to the rotational speed of the motor, and a reference voltage. a comparison circuit that compares and generates a control signal; an emitter follower transistor whose base is connected to an output terminal of the comparison circuit; and a plurality of resistors and the motor according to an output signal of the emitter follower transistor. In the IC-based motor drive circuit including a control transistor for controlling a current flowing in the emitter follower transistor, a protection diode is connected between the collector of the emitter follower transistor and the first terminal, and the polarity of the protection diode is set to the polarity of the protection diode. A protection circuit for a motor drive circuit, characterized in that the polarity of a parasitic diode generated between the collector of an emitter follower transistor and the substrate of an IC is reversed.
JP1985178441U 1985-11-20 1985-11-20 Pending JPS6288489U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1985178441U JPS6288489U (en) 1985-11-20 1985-11-20

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1985178441U JPS6288489U (en) 1985-11-20 1985-11-20

Publications (1)

Publication Number Publication Date
JPS6288489U true JPS6288489U (en) 1987-06-05

Family

ID=31120573

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1985178441U Pending JPS6288489U (en) 1985-11-20 1985-11-20

Country Status (1)

Country Link
JP (1) JPS6288489U (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03207286A (en) * 1990-01-10 1991-09-10 Sankyo Seiki Mfg Co Ltd Speed control circuit for dc motor
JPH03212189A (en) * 1990-01-16 1991-09-17 Sankyo Seiki Mfg Co Ltd Speed control circuit for dc motor

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5625392A (en) * 1979-08-04 1981-03-11 Sankyo Seiki Mfg Co Ltd Speed controller for compact dc motor
JPS56138838A (en) * 1980-03-31 1981-10-29 Matsushita Electric Works Ltd Bistable relay driving circuit

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5625392A (en) * 1979-08-04 1981-03-11 Sankyo Seiki Mfg Co Ltd Speed controller for compact dc motor
JPS56138838A (en) * 1980-03-31 1981-10-29 Matsushita Electric Works Ltd Bistable relay driving circuit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03207286A (en) * 1990-01-10 1991-09-10 Sankyo Seiki Mfg Co Ltd Speed control circuit for dc motor
JPH03212189A (en) * 1990-01-16 1991-09-17 Sankyo Seiki Mfg Co Ltd Speed control circuit for dc motor

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