JPS54121947A - Overvoltage protective circuit - Google Patents

Overvoltage protective circuit

Info

Publication number
JPS54121947A
JPS54121947A JP2961278A JP2961278A JPS54121947A JP S54121947 A JPS54121947 A JP S54121947A JP 2961278 A JP2961278 A JP 2961278A JP 2961278 A JP2961278 A JP 2961278A JP S54121947 A JPS54121947 A JP S54121947A
Authority
JP
Japan
Prior art keywords
circuit
time
thyristor
voltage
overvoltage
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
JP2961278A
Other languages
Japanese (ja)
Inventor
Tadao Mizumura
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon 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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP2961278A priority Critical patent/JPS54121947A/en
Publication of JPS54121947A publication Critical patent/JPS54121947A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To protect completely load from overvoltage due to short-circuit between input and output by making operating time irrelevant to the operating time of circuit breaker.
CONSTITUTION: The resistor 15 for limiting current at the time of thyristor electrification is connected to between the anode of the circuit breaker 13 and the thyristor 14 and the DC voltage stabilization circuit 11. As soon as the thyristor is electrified, the input voltage of the DC voltage stabilization circuit 11 is limited to the voltage between anode and cathode at the time of thyristor electrification. For this reason, even if the action of the circuit breaker is delayed, no overvoltage is applied to the loa circuit 21. At this time, if the turn-on time of the thyristor and the detection time of the overvoltage detection circuit are much faster than a time constant determined by the low-pass filter inside the DC voltate stabilization circuit 11, the voltage applied to the load circuit 21 is determind by the Zener voltage of the Zener diode 18.
COPYRIGHT: (C)1979,JPO&Japio
JP2961278A 1978-03-14 1978-03-14 Overvoltage protective circuit Pending JPS54121947A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2961278A JPS54121947A (en) 1978-03-14 1978-03-14 Overvoltage protective circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2961278A JPS54121947A (en) 1978-03-14 1978-03-14 Overvoltage protective circuit

Publications (1)

Publication Number Publication Date
JPS54121947A true JPS54121947A (en) 1979-09-21

Family

ID=12280884

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2961278A Pending JPS54121947A (en) 1978-03-14 1978-03-14 Overvoltage protective circuit

Country Status (1)

Country Link
JP (1) JPS54121947A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57110031A (en) * 1980-12-25 1982-07-08 Tokyo Shibaura Electric Co Dc stabilized power source for amplifier type instrument transformer

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57110031A (en) * 1980-12-25 1982-07-08 Tokyo Shibaura Electric Co Dc stabilized power source for amplifier type instrument transformer
JPH0125297B2 (en) * 1980-12-25 1989-05-17 Tokyo Shibaura Electric Co

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