JPS5497752A - Protective circuit for switching regulator - Google Patents

Protective circuit for switching regulator

Info

Publication number
JPS5497752A
JPS5497752A JP543178A JP543178A JPS5497752A JP S5497752 A JPS5497752 A JP S5497752A JP 543178 A JP543178 A JP 543178A JP 543178 A JP543178 A JP 543178A JP S5497752 A JPS5497752 A JP S5497752A
Authority
JP
Japan
Prior art keywords
transistor
collector
switching transistor
emitter
voltage
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
JP543178A
Other languages
Japanese (ja)
Inventor
Takehisa Sato
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.)
Tokyo Sanyo Electric Co Ltd
Sanyo Electric Co Ltd
Original Assignee
Tokyo Sanyo Electric Co Ltd
Sanyo 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 Tokyo Sanyo Electric Co Ltd, Sanyo Electric Co Ltd filed Critical Tokyo Sanyo Electric Co Ltd
Priority to JP543178A priority Critical patent/JPS5497752A/en
Publication of JPS5497752A publication Critical patent/JPS5497752A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To protect switching transistor by the procedure in which by detecting the collector-emitter saturated voltage of transistor when it exceeds a predetermined value, the pulse width of high frequency pulse is eliminated by control circuit and electrification of transistor is shut off.
CONSTITUTION: The Zener diode Dz is connected through resistor in parallel to between the collector and emitter of the switching transistor 3, and when the collector and emitter saturated voltage of the transistor 3 exceeds the Zener voltage, the transistor 7 for detection is electrified and the pulse width of high frequency pulse is made zero by the control circuit 6, making the switching transistor 3 non- energized. Since this is a collector-emitter saturated voltage detection type, voltage applied to switching transistor which was so far not detected is high and thus protection is made possible in the region where current flowing in switching transistor is small.
COPYRIGHT: (C)1979,JPO&Japio
JP543178A 1978-01-18 1978-01-18 Protective circuit for switching regulator Pending JPS5497752A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP543178A JPS5497752A (en) 1978-01-18 1978-01-18 Protective circuit for switching regulator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP543178A JPS5497752A (en) 1978-01-18 1978-01-18 Protective circuit for switching regulator

Publications (1)

Publication Number Publication Date
JPS5497752A true JPS5497752A (en) 1979-08-02

Family

ID=11610992

Family Applications (1)

Application Number Title Priority Date Filing Date
JP543178A Pending JPS5497752A (en) 1978-01-18 1978-01-18 Protective circuit for switching regulator

Country Status (1)

Country Link
JP (1) JPS5497752A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5635633A (en) * 1979-08-31 1981-04-08 Hitachi Ltd Load protecting circuit
US4484127A (en) * 1982-05-28 1984-11-20 Otis Elevator Company Inverter power transistor protection

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5635633A (en) * 1979-08-31 1981-04-08 Hitachi Ltd Load protecting circuit
US4484127A (en) * 1982-05-28 1984-11-20 Otis Elevator Company Inverter power transistor protection

Similar Documents

Publication Publication Date Title
JPS57124946A (en) Pulse detection circuit
JPS5510208A (en) Aso protection circuit
ES476787A1 (en) Earth leakage protection
JPS5497752A (en) Protective circuit for switching regulator
JPS5222715A (en) Protection device for motor and control semiconductor element
JPS5513636A (en) Protection circuit for switched-mode power supply circuit
JPS5672366A (en) Measuring device of holding current of thyristor
JPS57131125A (en) Short-circuit protecting circuit of semiconductor switch
JPS5556495A (en) A.c. motor controller
JPS54125049A (en) Transistor circuit
JPS56159716A (en) Direct-current electric power device
JPS5367849A (en) Overcurrent protecting device for power source apparatus
JPS55138648A (en) Ionization type smoke detector
JPS56101158A (en) Power supply device of copying machine
JPS57174907A (en) Muting circuit
JPS53141452A (en) Overcurrent protector in stabilized power unit
JPS54136619A (en) Dc voltage stabilized power unit
JPS5482646A (en) Surge control circuit
JPS5346652A (en) Protection circuit for switching regulator
JPS55124848A (en) Malfunction prevention unit for microprocessor
JPS544346A (en) Protective circuit for ac switching circuit
JPS5688667A (en) Protective device for gate turn-off thyristor
JPS52103661A (en) Overcurrent detector circuit
JPS55120225A (en) Semiconductor breaker
JPS57129007A (en) Protecting circuit of power amplifier