JPS54136271A - Switching circuit of transistor type - Google Patents
Switching circuit of transistor typeInfo
- Publication number
- JPS54136271A JPS54136271A JP4448578A JP4448578A JPS54136271A JP S54136271 A JPS54136271 A JP S54136271A JP 4448578 A JP4448578 A JP 4448578A JP 4448578 A JP4448578 A JP 4448578A JP S54136271 A JPS54136271 A JP S54136271A
- Authority
- JP
- Japan
- Prior art keywords
- transistor
- voltage
- diode
- switching circuit
- emitter
- 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
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/08—Modifications for protecting switching circuit against overcurrent or overvoltage
- H03K17/082—Modifications for protecting switching circuit against overcurrent or overvoltage by feedback from the output to the control circuit
- H03K17/0826—Modifications for protecting switching circuit against overcurrent or overvoltage by feedback from the output to the control circuit in bipolar transistor switches
Landscapes
- Electronic Switches (AREA)
Abstract
PURPOSE:To increase the breakdown rating, by providing the voltage element which is conductive when the voltage between the power supply lines exceeds a given amplitude, and the auxiliary transistor increasing the base current of the output transistor through the amplification of the current flowing to the voltage element. CONSTITUTION:The diode 9 being the constant voltage element and the NPN transistor 10 being the auxiliary transistor are provided to the switching circuit. The cathode of the diode 9 is connected to the power supply line, the anode is connected to the base of the transistor 10, and the collector and emitter of the transistor 10 are respectively connected to the collector and emitter of the output transistor 4. With this constitution, when the Zener voltage of the diode 9 is set so that it satisfies the equation 1, when no abnormal surge voltage is present, the circuit operates normally, but if surge voltage is incoming, the output transistor 4 is in saturation condition to avoid damage.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4448578A JPS54136271A (en) | 1978-04-14 | 1978-04-14 | Switching circuit of transistor type |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4448578A JPS54136271A (en) | 1978-04-14 | 1978-04-14 | Switching circuit of transistor type |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS54136271A true JPS54136271A (en) | 1979-10-23 |
Family
ID=12692835
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP4448578A Pending JPS54136271A (en) | 1978-04-14 | 1978-04-14 | Switching circuit of transistor type |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS54136271A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH05240433A (en) * | 1992-02-27 | 1993-09-17 | Hanshin Electric Co Ltd | Load control circuit for hot water feeder |
EP2051359A1 (en) * | 2007-10-09 | 2009-04-22 | Mitsubishi Electric Corporation | Power supply circuit and earth leakage circuit breaker using the same |
-
1978
- 1978-04-14 JP JP4448578A patent/JPS54136271A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH05240433A (en) * | 1992-02-27 | 1993-09-17 | Hanshin Electric Co Ltd | Load control circuit for hot water feeder |
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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