JPS56164416A - Constant current control circuit - Google Patents

Constant current control circuit

Info

Publication number
JPS56164416A
JPS56164416A JP6802480A JP6802480A JPS56164416A JP S56164416 A JPS56164416 A JP S56164416A JP 6802480 A JP6802480 A JP 6802480A JP 6802480 A JP6802480 A JP 6802480A JP S56164416 A JPS56164416 A JP S56164416A
Authority
JP
Japan
Prior art keywords
level signal
current
prescribed
turned
outputs
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
JP6802480A
Other languages
Japanese (ja)
Inventor
Nobuhisa Yamazaki
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.)
Usac Electronic Ind Co Ltd
Original Assignee
Usac Electronic Ind 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 Usac Electronic Ind Co Ltd filed Critical Usac Electronic Ind Co Ltd
Priority to JP6802480A priority Critical patent/JPS56164416A/en
Publication of JPS56164416A publication Critical patent/JPS56164416A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/08—Modifications for protecting switching circuit against overcurrent or overvoltage
    • H03K17/082—Modifications for protecting switching circuit against overcurrent or overvoltage by feedback from the output to the control circuit
    • H03K17/0826—Modifications for protecting switching circuit against overcurrent or overvoltage by feedback from the output to the control circuit in bipolar transistor switches

Landscapes

  • Dot-Matrix Printers And Others (AREA)

Abstract

PURPOSE:To decrease the number of leader lines from a load, by turning on a switching element with the condition that a current detecting value exceeds a prescribed value after a prescribed time when the switching element is turned off, in a print driving mechanism of an impact type dot printer. CONSTITUTION:When a control signal is fed, an AND gate 25 outputs a high level signal, turning on a transistor (TR)21 and a current I flowing to a magnet coil 3 increases with a prescribed rate. Further, when the current I exceeds a prescribed value, the output of a comparison circuit 27 is fallen down and a monostable multivibrator 26 outputs a low level signal for a prescribed time. The TR21 is turned off by this low level signal, and when the TR21 is turned off, the current I decreases in a prescrived rate, and when the output of the monostable multivibrator 26 is switched to a high level, the gate 25 again outputs a high level signal to turn on the TR21. Thus, the number of leader lines from the load can be decreased, allowing to make the control with comparatively high accuracy.
JP6802480A 1980-05-21 1980-05-21 Constant current control circuit Pending JPS56164416A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6802480A JPS56164416A (en) 1980-05-21 1980-05-21 Constant current control circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6802480A JPS56164416A (en) 1980-05-21 1980-05-21 Constant current control circuit

Publications (1)

Publication Number Publication Date
JPS56164416A true JPS56164416A (en) 1981-12-17

Family

ID=13361821

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6802480A Pending JPS56164416A (en) 1980-05-21 1980-05-21 Constant current control circuit

Country Status (1)

Country Link
JP (1) JPS56164416A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4523251A (en) * 1981-10-13 1985-06-11 Erwin Sick Gmbh Optik-Elektronik Electronic apparatus comprising an input stage with a binary output connected to a relay control circuit
JPS61188843U (en) * 1985-05-17 1986-11-25

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5392651A (en) * 1977-01-24 1978-08-14 Motorola Inc Crystalltuned voltage control oscillator
JPS54139048A (en) * 1978-04-20 1979-10-29 Mitsubishi Electric Corp Dc control circuit

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5392651A (en) * 1977-01-24 1978-08-14 Motorola Inc Crystalltuned voltage control oscillator
JPS54139048A (en) * 1978-04-20 1979-10-29 Mitsubishi Electric Corp Dc control circuit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4523251A (en) * 1981-10-13 1985-06-11 Erwin Sick Gmbh Optik-Elektronik Electronic apparatus comprising an input stage with a binary output connected to a relay control circuit
JPS61188843U (en) * 1985-05-17 1986-11-25

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