JPS5755784A - Current limiting circuit - Google Patents

Current limiting circuit

Info

Publication number
JPS5755784A
JPS5755784A JP55129144A JP12914480A JPS5755784A JP S5755784 A JPS5755784 A JP S5755784A JP 55129144 A JP55129144 A JP 55129144A JP 12914480 A JP12914480 A JP 12914480A JP S5755784 A JPS5755784 A JP S5755784A
Authority
JP
Japan
Prior art keywords
current
circuit
value
current limiting
fet18
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
JP55129144A
Other languages
Japanese (ja)
Inventor
Iwao Okita
Hidenori Naoi
Hideaki Kawai
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.)
Oki Electric Industry Co Ltd
Original Assignee
Oki Electric Industry Co Ltd
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 Oki Electric Industry Co Ltd filed Critical Oki Electric Industry Co Ltd
Priority to JP55129144A priority Critical patent/JPS5755784A/en
Publication of JPS5755784A publication Critical patent/JPS5755784A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P7/00—Arrangements for regulating or controlling the speed or torque of electric DC motors
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
    • H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current

Abstract

PURPOSE:To limit the current independently of a closed loop circuit of a servomechanism control system, by a method wherein a current limiting circuit is composed at a variable resistance element, the resistance value of which is varied by an output obtained by comparing a current detecting signal with a preset reference signal. CONSTITUTION:A current instruction signal 1 drives a motor 7 through an amplifier 4, a pulse-width modulation circuit 5 and a switching circuit 6, and a detector 8 detects the driving current and applies feedback to the amplifier 4. On the other hand, the output of the detector 8 is put into a current limitation setting circuit 20, passed through an absolute value circuit 16, compared with the set value of a volume 11 and controls the gate of FET18. Thus, by making FET18 operate as a variable resistance element and making the current limitation setting circuit 20 operate independently of the feedback circuit, the maximum current of the motor 7 can be limited accurately depending only on the preset current limiting value.
JP55129144A 1980-09-19 1980-09-19 Current limiting circuit Pending JPS5755784A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55129144A JPS5755784A (en) 1980-09-19 1980-09-19 Current limiting circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55129144A JPS5755784A (en) 1980-09-19 1980-09-19 Current limiting circuit

Publications (1)

Publication Number Publication Date
JPS5755784A true JPS5755784A (en) 1982-04-02

Family

ID=15002208

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55129144A Pending JPS5755784A (en) 1980-09-19 1980-09-19 Current limiting circuit

Country Status (1)

Country Link
JP (1) JPS5755784A (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4981821A (en) * 1972-12-13 1974-08-07
JPS5222713A (en) * 1975-08-14 1977-02-21 Toshiba Corp Speed control device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4981821A (en) * 1972-12-13 1974-08-07
JPS5222713A (en) * 1975-08-14 1977-02-21 Toshiba Corp Speed control device

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