JPS54121947A - Overvoltage protective circuit - Google Patents
Overvoltage protective circuitInfo
- 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
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
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)
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 |
-
1978
- 1978-03-14 JP JP2961278A patent/JPS54121947A/en active Pending
Cited By (2)
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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