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JPS5755428A - Protection circuit - Google Patents

Protection circuit

Info

Publication number
JPS5755428A
JPS5755428A JP13023480A JP13023480A JPS5755428A JP S5755428 A JPS5755428 A JP S5755428A JP 13023480 A JP13023480 A JP 13023480A JP 13023480 A JP13023480 A JP 13023480A JP S5755428 A JPS5755428 A JP S5755428A
Authority
JP
Japan
Prior art keywords
power supply
circuit
voltage
control section
driving
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
JP13023480A
Other languages
Japanese (ja)
Inventor
Minoru Machida
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.)
Canon Inc
Original Assignee
Canon Inc
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 Canon Inc filed Critical Canon Inc
Priority to JP13023480A priority Critical patent/JPS5755428A/en
Publication of JPS5755428A publication Critical patent/JPS5755428A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
    • G05F1/10—Regulating voltage or current
    • G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
    • G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
    • G05F1/565—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices sensing a condition of the system or its load in addition to means responsive to deviations in the output of the system, e.g. current, voltage, power factor
    • G05F1/569—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices sensing a condition of the system or its load in addition to means responsive to deviations in the output of the system, e.g. current, voltage, power factor for protection
    • G05F1/571—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices sensing a condition of the system or its load in addition to means responsive to deviations in the output of the system, e.g. current, voltage, power factor for protection with overvoltage detector

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Automation & Control Theory (AREA)
  • Continuous-Control Power Sources That Use Transistors (AREA)

Abstract

PURPOSE:To prevent the failed operation of a device, by detecting a power supply voltage for control section that it does not reach a normal voltage and interrupting a driving power supply, in a device using the controlling power supply and the power supply for driving section controlled with the control section. CONSTITUTION:In a power supply 3 for a driving circuit 4 controlled with a control section circuit 2 and a controlling section power supply 1, a protective circuit consisting of transistors (TR) Q1, Q2, Q3, Zener diode DZ, and resistors R1, R2, R3 is added between lines which tie the power supply 1, circuit 2, power supply 3 and line 4. If a voltage of the power supply 1 does not reach a normal voltage, this is detected at the diode DZ, and a current flowing from the power supply 1 to the circuit 4 is cut off via the TRs, allowing to prevent abnormal operation of the circuit 4.
JP13023480A 1980-09-18 1980-09-18 Protection circuit Pending JPS5755428A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13023480A JPS5755428A (en) 1980-09-18 1980-09-18 Protection circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13023480A JPS5755428A (en) 1980-09-18 1980-09-18 Protection circuit

Publications (1)

Publication Number Publication Date
JPS5755428A true JPS5755428A (en) 1982-04-02

Family

ID=15029313

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13023480A Pending JPS5755428A (en) 1980-09-18 1980-09-18 Protection circuit

Country Status (1)

Country Link
JP (1) JPS5755428A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5958817U (en) * 1982-10-07 1984-04-17 三洋電機株式会社 power circuit
JPS60239816A (en) * 1984-05-14 1985-11-28 Matsushita Electric Ind Co Ltd Power supply failure signal output circuit of measuring instrument
JPS61289413A (en) * 1985-06-18 1986-12-19 Matsushita Electric Ind Co Ltd Power supply circuit
JPS62109112A (en) * 1985-11-08 1987-05-20 Matsushita Electric Ind Co Ltd Sequence circuit for power supply
JPH02109109A (en) * 1988-10-18 1990-04-20 Canon Inc Electronic equipment
JP2011114585A (en) * 2009-11-26 2011-06-09 Kyocera Corp Signal supply control circuit, operation method and control method thereof, and signal processing circuit

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5958817U (en) * 1982-10-07 1984-04-17 三洋電機株式会社 power circuit
JPH0441368Y2 (en) * 1982-10-07 1992-09-29
JPS60239816A (en) * 1984-05-14 1985-11-28 Matsushita Electric Ind Co Ltd Power supply failure signal output circuit of measuring instrument
JPH0477326B2 (en) * 1984-05-14 1992-12-08 Matsushita Electric Ind Co Ltd
JPS61289413A (en) * 1985-06-18 1986-12-19 Matsushita Electric Ind Co Ltd Power supply circuit
JPS62109112A (en) * 1985-11-08 1987-05-20 Matsushita Electric Ind Co Ltd Sequence circuit for power supply
JPH02109109A (en) * 1988-10-18 1990-04-20 Canon Inc Electronic equipment
JP2011114585A (en) * 2009-11-26 2011-06-09 Kyocera Corp Signal supply control circuit, operation method and control method thereof, and signal processing circuit

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