JPS5598622A - Electromagnetic valve driving circuit - Google Patents

Electromagnetic valve driving circuit

Info

Publication number
JPS5598622A
JPS5598622A JP605579A JP605579A JPS5598622A JP S5598622 A JPS5598622 A JP S5598622A JP 605579 A JP605579 A JP 605579A JP 605579 A JP605579 A JP 605579A JP S5598622 A JPS5598622 A JP S5598622A
Authority
JP
Japan
Prior art keywords
transistor
high voltage
voltage
driving circuit
electromagnetic valve
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
JP605579A
Other languages
Japanese (ja)
Inventor
Toshio Ishii
Taiji Hasegawa
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP605579A priority Critical patent/JPS5598622A/en
Publication of JPS5598622A publication Critical patent/JPS5598622A/en
Pending legal-status Critical Current

Links

Landscapes

  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)

Abstract

PURPOSE: To enable to protect an electromagnetic coil driving transistor, by positively disconnecting the transistor when an extraordinary high voltage is produced.
CONSTITUTION: In case that an extraordinarily high voltage is applied in power- source line 305 and the voltage becmes higher than the Zener voltage determined by Zener diode 304, current is passed to the base of control transistor 6 via resistance 302 and Zener diode 304 and transistor 6 is turned On, so that driving transistor 3 is turned OFF. Therefore, overcurrent is not passed in transistor 3 so that it is protected from rupture. When application of the extraordinary high voltage in power-source line 305 is removed, transistor 3 returns to its ordinary operation by the output pulse of function generator 200.
COPYRIGHT: (C)1980,JPO&Japio
JP605579A 1979-01-24 1979-01-24 Electromagnetic valve driving circuit Pending JPS5598622A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP605579A JPS5598622A (en) 1979-01-24 1979-01-24 Electromagnetic valve driving circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP605579A JPS5598622A (en) 1979-01-24 1979-01-24 Electromagnetic valve driving circuit

Publications (1)

Publication Number Publication Date
JPS5598622A true JPS5598622A (en) 1980-07-26

Family

ID=11627916

Family Applications (1)

Application Number Title Priority Date Filing Date
JP605579A Pending JPS5598622A (en) 1979-01-24 1979-01-24 Electromagnetic valve driving circuit

Country Status (1)

Country Link
JP (1) JPS5598622A (en)

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