JPS6423722A - Surge protector for power source circuit - Google Patents
Surge protector for power source circuitInfo
- Publication number
- JPS6423722A JPS6423722A JP17679687A JP17679687A JPS6423722A JP S6423722 A JPS6423722 A JP S6423722A JP 17679687 A JP17679687 A JP 17679687A JP 17679687 A JP17679687 A JP 17679687A JP S6423722 A JPS6423722 A JP S6423722A
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- point
- potential
- zener
- current
- 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
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
PURPOSE:To obtain a simple and inexpensive surge protector, by reducing allowable loss of a resistor and a Zener diode. CONSTITUTION:Upon application of a surge voltage VP at point A, potential at point B is cut through Zener voltage VZ. Potential at point C is a sum of base-emitter voltage VBE and a Zener voltage Y2. When the Zener voltage V2 is set at a level about 0.6-0.7V lower than the maximum input voltage of a voltage regulator 2, potential at point C does not exceed the maximum input voltage. Normally, consumption current in 5V system flows from point A through collector and emitter of a transistor 5, point C to the voltage regulator 2. Current level is subjected to limitation of collector current, but no trouble occurs in the consumption current of 5V system when the transistor is selected properly. Resistor 6 may have high resistance for feeding base consumption current of 5V system, and thereby allowable loss can be reduced.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP17679687A JPS6423722A (en) | 1987-07-15 | 1987-07-15 | Surge protector for power source circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP17679687A JPS6423722A (en) | 1987-07-15 | 1987-07-15 | Surge protector for power source circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6423722A true JPS6423722A (en) | 1989-01-26 |
Family
ID=16019992
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP17679687A Pending JPS6423722A (en) | 1987-07-15 | 1987-07-15 | Surge protector for power source circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6423722A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5312093A (en) * | 1992-01-28 | 1994-05-17 | Applied Power Inc. | Vibration isolator with two pairs of fluid chambers with diagonal fluid communication |
EP2051359A1 (en) | 2007-10-09 | 2009-04-22 | Mitsubishi Electric Corporation | Power supply circuit and earth leakage circuit breaker using the same |
-
1987
- 1987-07-15 JP JP17679687A patent/JPS6423722A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5312093A (en) * | 1992-01-28 | 1994-05-17 | Applied Power Inc. | Vibration isolator with two pairs of fluid chambers with diagonal fluid communication |
EP2051359A1 (en) | 2007-10-09 | 2009-04-22 | Mitsubishi Electric Corporation | Power supply circuit and earth leakage circuit breaker using the same |
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