JPS645356A - Self-excited flyback type dc-dc converter - Google Patents

Self-excited flyback type dc-dc converter

Info

Publication number
JPS645356A
JPS645356A JP15965087A JP15965087A JPS645356A JP S645356 A JPS645356 A JP S645356A JP 15965087 A JP15965087 A JP 15965087A JP 15965087 A JP15965087 A JP 15965087A JP S645356 A JPS645356 A JP S645356A
Authority
JP
Japan
Prior art keywords
transformer
self
magnetic flux
core
starting
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
JP15965087A
Other languages
Japanese (ja)
Other versions
JPH0359669B2 (en
Inventor
Hajime Harada
Toshiyuki Takahashi
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.)
Nippon Koden Corp
Original Assignee
Nippon Koden 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 Nippon Koden Corp filed Critical Nippon Koden Corp
Priority to JP15965087A priority Critical patent/JPS645356A/en
Publication of JPS645356A publication Critical patent/JPS645356A/en
Publication of JPH0359669B2 publication Critical patent/JPH0359669B2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Dc-Dc Converters (AREA)

Abstract

PURPOSE:To improve the utilization factor of a core and reduce noise emission by starting an oscillating transistor regardless of a state of load every time a core magnetic flux becomes zero in each oscillation period. CONSTITUTION:A self-excited flyback type DC-DC converter is composed of a self-excited blocking oscillation circuit and the like by a blocking transformer T1, an oscillating transistor (Tr) Q1 and the like, and is also equipped with an error voltare generator circuit 1, a photo-coupler 2, a feedback control circuit 3 conducting a constant-voltage control and the like. In said feedback control circuit 3, a feedback controlling TrQ2 is connected with the base of said TrQ1 and with the feedback output terminal of said photo-coupler 2 so that said TrQ2 is turned OFF before starting and ON after starting. Then, at the point of time when the residual magnetic flux of said transformer T1 becomes zero, the base current of said TrQ1 is caused to flow to start said transformer. Thus, the utilization factor of a core is improved, because the residual DC component of a transformer magnetic flux disappears.
JP15965087A 1987-06-29 1987-06-29 Self-excited flyback type dc-dc converter Granted JPS645356A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15965087A JPS645356A (en) 1987-06-29 1987-06-29 Self-excited flyback type dc-dc converter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15965087A JPS645356A (en) 1987-06-29 1987-06-29 Self-excited flyback type dc-dc converter

Publications (2)

Publication Number Publication Date
JPS645356A true JPS645356A (en) 1989-01-10
JPH0359669B2 JPH0359669B2 (en) 1991-09-11

Family

ID=15698344

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15965087A Granted JPS645356A (en) 1987-06-29 1987-06-29 Self-excited flyback type dc-dc converter

Country Status (1)

Country Link
JP (1) JPS645356A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02250661A (en) * 1989-03-22 1990-10-08 Daikin Ind Ltd Power unit for air-conditioner

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02250661A (en) * 1989-03-22 1990-10-08 Daikin Ind Ltd Power unit for air-conditioner

Also Published As

Publication number Publication date
JPH0359669B2 (en) 1991-09-11

Similar Documents

Publication Publication Date Title
JPS57138868A (en) Voltage resonance type high frequency switching circuit
JPS5577372A (en) Multi-output converter
JPH048703Y2 (en)
JPS62262662A (en) Switching regulator
JPH0635661Y2 (en) Switching regulator
JPH0545111Y2 (en)
JP2918933B2 (en) Voltage detection circuit
SU1453385A1 (en) Gate-type d.c. voltage stabilizer
JPH0246236Y2 (en)
SU1746490A1 (en) Stabilized dc voltage converter
JPH0312066Y2 (en)
JPS645992Y2 (en)
JPH02129190U (en)
JPS5641767A (en) Dc-dc converter
JPS57142174A (en) Self-excited dc/dc converter
JPH02299432A (en) Charging circuit
JPS58123366A (en) Power source
JPS6356413U (en)
JPS63107461A (en) Switching regulator
JPS61184299U (en)
JPH02184264A (en) Switching power source device
JPH01198275A (en) Self-excited switching power source
JPS6229995B2 (en)
JPH01218355A (en) Switching power supply
JPS6460262A (en) Switching regulator

Legal Events

Date Code Title Description
LAPS Cancellation because of no payment of annual fees