JPS5530743A - Isolation type digital signal input circuit - Google Patents

Isolation type digital signal input circuit

Info

Publication number
JPS5530743A
JPS5530743A JP10291878A JP10291878A JPS5530743A JP S5530743 A JPS5530743 A JP S5530743A JP 10291878 A JP10291878 A JP 10291878A JP 10291878 A JP10291878 A JP 10291878A JP S5530743 A JPS5530743 A JP S5530743A
Authority
JP
Japan
Prior art keywords
drive
digital signal
signal input
input circuit
secondary winding
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
JP10291878A
Other languages
Japanese (ja)
Other versions
JPS59185B2 (en
Inventor
Tomio Kato
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.)
Fuji Electric Co Ltd
Original Assignee
Fuji Electric 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 Fuji Electric Co Ltd filed Critical Fuji Electric Co Ltd
Priority to JP10291878A priority Critical patent/JPS59185B2/en
Publication of JPS5530743A publication Critical patent/JPS5530743A/en
Publication of JPS59185B2 publication Critical patent/JPS59185B2/en
Expired legal-status Critical Current

Links

Landscapes

  • Electronic Switches (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Dc Digital Transmission (AREA)

Abstract

PURPOSE: To prevent the malfunction with a simple constitution and the damage in semiconductor and to enable high integrated mounting, by using the potential at the connecting point between the secondary winding of an isolation transformer and the drive transistor as the output corresponding to ON and OFF of the switching circuit.
CONSTITUTION: The isolation transformer 33 has the primary and secondary windings, the diode 32 is connected in parallel with the primary winding, and the transistor Tr switching circuit 31 is connected in the opposite connection as the diode 32 so that the primary winding can be shortened. Further, the drive Tr 34 is connected in series with the secondary winding and also the parallel capacitor 38, and it is connected to the power supply Vcc via the resistor 37. Thus, the potential at the connecting point between the secondary winding and the drive Tr is used as the output corresponding to ON and OFF of the circuit 31. Then, with a simple constitution, malfunction is avoided in the control unit and the damages in semiconductors are prevented to enable high integration mounting.
COPYRIGHT: (C)1980,JPO&Japio
JP10291878A 1978-08-25 1978-08-25 Isolated digital signal input circuit Expired JPS59185B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10291878A JPS59185B2 (en) 1978-08-25 1978-08-25 Isolated digital signal input circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10291878A JPS59185B2 (en) 1978-08-25 1978-08-25 Isolated digital signal input circuit

Publications (2)

Publication Number Publication Date
JPS5530743A true JPS5530743A (en) 1980-03-04
JPS59185B2 JPS59185B2 (en) 1984-01-05

Family

ID=14340229

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10291878A Expired JPS59185B2 (en) 1978-08-25 1978-08-25 Isolated digital signal input circuit

Country Status (1)

Country Link
JP (1) JPS59185B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS587922A (en) * 1981-07-07 1983-01-17 Fuji Electric Co Ltd Insulating type digital signal inputting circuit

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63103671U (en) * 1986-12-25 1988-07-05
JPH02149280U (en) * 1989-05-23 1990-12-19
JPH04272779A (en) * 1991-02-27 1992-09-29 Hirotaka Nakano Plaything

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS587922A (en) * 1981-07-07 1983-01-17 Fuji Electric Co Ltd Insulating type digital signal inputting circuit

Also Published As

Publication number Publication date
JPS59185B2 (en) 1984-01-05

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