JPS5537859A - Protection circuit for switching regulator - Google Patents

Protection circuit for switching regulator

Info

Publication number
JPS5537859A
JPS5537859A JP11028978A JP11028978A JPS5537859A JP S5537859 A JPS5537859 A JP S5537859A JP 11028978 A JP11028978 A JP 11028978A JP 11028978 A JP11028978 A JP 11028978A JP S5537859 A JPS5537859 A JP S5537859A
Authority
JP
Japan
Prior art keywords
input voltage
width
transistor
control pulse
pulse
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.)
Granted
Application number
JP11028978A
Other languages
Japanese (ja)
Other versions
JPS5836589B2 (en
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 JP53110289A priority Critical patent/JPS5836589B2/en
Publication of JPS5537859A publication Critical patent/JPS5537859A/en
Publication of JPS5836589B2 publication Critical patent/JPS5836589B2/en
Expired legal-status Critical Current

Links

Landscapes

  • Protection Of Static Devices (AREA)
  • Dc-Dc Converters (AREA)
  • Power Conversion In General (AREA)

Abstract

PURPOSE: To keep a protection level constant despite a wide range of input voltage and appropriately use transistor, by modulating the width of control pulse by a semiconductor device current detector and a rectifier voltage fluctuation detector.
CONSTITUTION: A switching transistor 2 is controlled by a pulse oscillation circuit 5 and a pulse width modulation circuit 6 to obtain an output from the secondary side of a transforner 3. The current of the transistor 2 is detected by a resistor R1. The input voltage Vi is detected by another resistor R3 and applied to the base of a detection transistor 8 biased by a negative voltage. The width of control pulse is controlled by the modulation circuit 6. When either an overcurrent flows or an exessive input voltage is applied, the width of control pulse decreases to perform protecting action. As a result, the protection level is kept constant despite the wide range of input voltage and the transistors of appropriate capacity are economically used.
COPYRIGHT: (C)1980,JPO&Japio
JP53110289A 1978-09-06 1978-09-06 Switching regulator protection circuit Expired JPS5836589B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP53110289A JPS5836589B2 (en) 1978-09-06 1978-09-06 Switching regulator protection circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP53110289A JPS5836589B2 (en) 1978-09-06 1978-09-06 Switching regulator protection circuit

Publications (2)

Publication Number Publication Date
JPS5537859A true JPS5537859A (en) 1980-03-17
JPS5836589B2 JPS5836589B2 (en) 1983-08-10

Family

ID=14531918

Family Applications (1)

Application Number Title Priority Date Filing Date
JP53110289A Expired JPS5836589B2 (en) 1978-09-06 1978-09-06 Switching regulator protection circuit

Country Status (1)

Country Link
JP (1) JPS5836589B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5854413A (en) * 1981-09-29 1983-03-31 Fujitsu Ltd Switching regulator

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5534885A (en) * 1978-09-04 1980-03-11 Toko Inc Switching regulator

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5534885A (en) * 1978-09-04 1980-03-11 Toko Inc Switching regulator

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5854413A (en) * 1981-09-29 1983-03-31 Fujitsu Ltd Switching regulator
JPH0472467B2 (en) * 1981-09-29 1992-11-18 Fujitsu Ltd

Also Published As

Publication number Publication date
JPS5836589B2 (en) 1983-08-10

Similar Documents

Publication Publication Date Title
JPS5534885A (en) Switching regulator
JPS567061A (en) Detector for output voltage drop of stabilizing dc power
JPS5537859A (en) Protection circuit for switching regulator
JPS56155420A (en) Alternating current regulated power supply device
JPS552354A (en) Power circuit
ES2091368T3 (en) WRONG CURRENT PROTECTION SWITCH.
JPS5469748A (en) Stabilized power source circuit
JPS5497727A (en) Switching regulator controller
SU773859A1 (en) Secondary power source
JPS5448030A (en) Vercurrent protection circuit for swtching regulator
JPS5597618A (en) Stabilizing power source circuit
JPS5346652A (en) Protection circuit for switching regulator
JPS55149873A (en) Overcurrent detector
JPS5490549A (en) Dc stabilized power source device
JPS54136619A (en) Dc voltage stabilized power unit
JPS55128373A (en) Welding power source circuit
KR830002416A (en) Overcurrent protection device
JPS5594581A (en) Switching regulator
JPS5659322A (en) Constant-voltage circuit
JPS52139940A (en) Constant voltage power source device
JPS5718103A (en) Electric power source circuit for transistor amplifier
JPS5313134A (en) Power source circuit
JPS5572739A (en) Loose oscillation preventing apparatus for atomizer
JPS5457647A (en) Power source voltage stabilizing circuit
JPS5523764A (en) Separately-excited dc-dc converter