JPH04156226A - Inverse connection preventing switching circuit - Google Patents

Inverse connection preventing switching circuit

Info

Publication number
JPH04156226A
JPH04156226A JP2278073A JP27807390A JPH04156226A JP H04156226 A JPH04156226 A JP H04156226A JP 2278073 A JP2278073 A JP 2278073A JP 27807390 A JP27807390 A JP 27807390A JP H04156226 A JPH04156226 A JP H04156226A
Authority
JP
Japan
Prior art keywords
photocouplers
transistors
switching circuit
connection preventing
inverse
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
JP2278073A
Other languages
Japanese (ja)
Inventor
Shugo Mizuno
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.)
NIHON DENKI MUSEN DENSHI KK
NIPPON DENKI MUSEN DENSHI KK
Original Assignee
NIHON DENKI MUSEN DENSHI KK
NIPPON DENKI MUSEN DENSHI KK
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 NIHON DENKI MUSEN DENSHI KK, NIPPON DENKI MUSEN DENSHI KK filed Critical NIHON DENKI MUSEN DENSHI KK
Priority to JP2278073A priority Critical patent/JPH04156226A/en
Publication of JPH04156226A publication Critical patent/JPH04156226A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To improve the reliability of an inverse connection preventing switching circuit by realizing the circuit by controlling the drain electrodes of a P-and N-type MOS transistors with a voltage obtained by dividing a voltage extracted from two photocouplers.
CONSTITUTION: Even when a switch 26 is turned on by connecting a positive-pole power supply input terminal 21 to the minus side and a negative-pole power supply input terminal 22 to the plus side, transistors are left opened, since the diodes of photocouplers 11 and 12 are biased in the opposite direction. However, since the diodes 24, 25, 27, and 28 for preventing inverse voltage of the photocouplers 11 and 12 are conducted and the gates of an N-and P-type MOS transistors 34 and 33 are biased respectively to negative and positive potential against their sources, the transistors 33 and 34 are not conductive between their drains and sources and no electric power is supplied to load terminals 35 and 36.
COPYRIGHT: (C)1992,JPO&Japio
JP2278073A 1990-10-17 1990-10-17 Inverse connection preventing switching circuit Pending JPH04156226A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2278073A JPH04156226A (en) 1990-10-17 1990-10-17 Inverse connection preventing switching circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2278073A JPH04156226A (en) 1990-10-17 1990-10-17 Inverse connection preventing switching circuit

Publications (1)

Publication Number Publication Date
JPH04156226A true JPH04156226A (en) 1992-05-28

Family

ID=17592273

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2278073A Pending JPH04156226A (en) 1990-10-17 1990-10-17 Inverse connection preventing switching circuit

Country Status (1)

Country Link
JP (1) JPH04156226A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015122863A (en) * 2013-12-24 2015-07-02 日本無線株式会社 Back-flow prevention support device

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5529243A (en) * 1978-08-21 1980-03-01 Tokyo Shibaura Electric Co Battery charger
JPH0265625A (en) * 1988-07-05 1990-03-06 Sgs Thomson Microelettronica Spa Electronic circuit protected from inversion of polarity of power source battery

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5529243A (en) * 1978-08-21 1980-03-01 Tokyo Shibaura Electric Co Battery charger
JPH0265625A (en) * 1988-07-05 1990-03-06 Sgs Thomson Microelettronica Spa Electronic circuit protected from inversion of polarity of power source battery

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015122863A (en) * 2013-12-24 2015-07-02 日本無線株式会社 Back-flow prevention support device

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