JPS5478423A - Voltage detection circuit - Google Patents

Voltage detection circuit

Info

Publication number
JPS5478423A
JPS5478423A JP14587877A JP14587877A JPS5478423A JP S5478423 A JPS5478423 A JP S5478423A JP 14587877 A JP14587877 A JP 14587877A JP 14587877 A JP14587877 A JP 14587877A JP S5478423 A JPS5478423 A JP S5478423A
Authority
JP
Japan
Prior art keywords
voltage
diode
remains
damped
capacitor
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
JP14587877A
Other languages
Japanese (ja)
Inventor
Atsushi Okubo
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 JP14587877A priority Critical patent/JPS5478423A/en
Publication of JPS5478423A publication Critical patent/JPS5478423A/en
Pending legal-status Critical Current

Links

Landscapes

  • Braking Systems And Boosters (AREA)
  • Control Of Electric Motors In General (AREA)

Abstract

PURPOSE: To operate an electrode brake despite the remaining of damped AC voltage, by detecting that the damped AC voltage reaches a predetermined level after a power switch for a motor is turned off.
CONSTITUTION: When the detected AC voltage is applied to input terminals IN, the terminal voltage of a resistor R2 and the base voltage of a transsistor T1 have wave forms as shown in Fig. Since the transistor T1 remains off before a time Tc, the terminal voltage of a capacitor C is higher than the Zener voltage of a constant voltage diode ZD2 and this diode remains on and supplies an output signal to output terminals OUT. Since the terminal voltage of the capacitor C is lower than the Zener voltage of the diode ZD2 after the time Tc, the diode remains off and supplies no output signal to the output terminals OUT. A predetermined level of increasing DC voltage can be detected on the ground of the state change of the diode ZD2.
COPYRIGHT: (C)1979,JPO&Japio
JP14587877A 1977-12-05 1977-12-05 Voltage detection circuit Pending JPS5478423A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14587877A JPS5478423A (en) 1977-12-05 1977-12-05 Voltage detection circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14587877A JPS5478423A (en) 1977-12-05 1977-12-05 Voltage detection circuit

Publications (1)

Publication Number Publication Date
JPS5478423A true JPS5478423A (en) 1979-06-22

Family

ID=15395128

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14587877A Pending JPS5478423A (en) 1977-12-05 1977-12-05 Voltage detection circuit

Country Status (1)

Country Link
JP (1) JPS5478423A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59221674A (en) * 1983-05-31 1984-12-13 Matsushita Electric Works Ltd Frequency detecting circuit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59221674A (en) * 1983-05-31 1984-12-13 Matsushita Electric Works Ltd Frequency detecting circuit
JPH0588429B2 (en) * 1983-05-31 1993-12-22 Matsushita Electric Works Ltd

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