JPS54136271A - Switching circuit of transistor type - Google Patents

Switching circuit of transistor type

Info

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
Application number
JP4448578A
Other languages
Japanese (ja)
Inventor
Masashi Jinmon
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP4448578A priority Critical patent/JPS54136271A/en
Publication of JPS54136271A publication Critical patent/JPS54136271A/en
Pending legal-status Critical Current

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

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.
JP4448578A 1978-04-14 1978-04-14 Switching circuit of transistor type Pending JPS54136271A (en)

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)

* Cited by examiner, † Cited by third party
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

Cited By (2)

* Cited by examiner, † Cited by third party
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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