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JPS5636717A - Constant current control system - Google Patents

Constant current control system

Info

Publication number
JPS5636717A
JPS5636717A JP11132179A JP11132179A JPS5636717A JP S5636717 A JPS5636717 A JP S5636717A JP 11132179 A JP11132179 A JP 11132179A JP 11132179 A JP11132179 A JP 11132179A JP S5636717 A JPS5636717 A JP S5636717A
Authority
JP
Japan
Prior art keywords
load
signal
resistance value
constant current
pulse width
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
JP11132179A
Other languages
Japanese (ja)
Inventor
Mitsutake Sato
Tamio Onuma
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP11132179A priority Critical patent/JPS5636717A/en
Publication of JPS5636717A publication Critical patent/JPS5636717A/en
Pending legal-status Critical Current

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Abstract

PURPOSE: To exercise constant current control with efficiency by independently controlling the pulse width and frequency of a signal that controls a switching transistor.
CONSTITUTION: When the resistance value of load RL is greater than a predetermined value, the pulse width of a signal to be applied to the base of transistor Q is so controlled that a load current will be constant. On the other hand, when the resistance value of load RL is less than the predetermined value, the frquency of the signal to be applied to the base of transistor Q is decreased. Since the frequency of the control signal is decreased according to a decrease in load resistance value to control switching transistor Q, the narrowing of the pulse width of the control signal and previous setting the load resistance value high are unnecessary and stable constant current operation can be carried out.
COPYRIGHT: (C)1981,JPO&Japio
JP11132179A 1979-08-31 1979-08-31 Constant current control system Pending JPS5636717A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11132179A JPS5636717A (en) 1979-08-31 1979-08-31 Constant current control system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11132179A JPS5636717A (en) 1979-08-31 1979-08-31 Constant current control system

Publications (1)

Publication Number Publication Date
JPS5636717A true JPS5636717A (en) 1981-04-10

Family

ID=14558246

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11132179A Pending JPS5636717A (en) 1979-08-31 1979-08-31 Constant current control system

Country Status (1)

Country Link
JP (1) JPS5636717A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63257461A (en) * 1987-04-15 1988-10-25 Fujitsu Ltd constant current device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63257461A (en) * 1987-04-15 1988-10-25 Fujitsu Ltd constant current device
JPH0570383B2 (en) * 1987-04-15 1993-10-05 Fujitsu Ltd

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