JPS6419969A - Self-oscillation type switching power supply - Google Patents

Self-oscillation type switching power supply

Info

Publication number
JPS6419969A
JPS6419969A JP17321487A JP17321487A JPS6419969A JP S6419969 A JPS6419969 A JP S6419969A JP 17321487 A JP17321487 A JP 17321487A JP 17321487 A JP17321487 A JP 17321487A JP S6419969 A JPS6419969 A JP S6419969A
Authority
JP
Japan
Prior art keywords
switching element
power supply
output voltage
self
circuit
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
JP17321487A
Other languages
Japanese (ja)
Other versions
JP2506789B2 (en
Inventor
Takuya Ishii
Nobuyoshi Nagakata
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP17321487A priority Critical patent/JP2506789B2/en
Publication of JPS6419969A publication Critical patent/JPS6419969A/en
Application granted granted Critical
Publication of JP2506789B2 publication Critical patent/JP2506789B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Abstract

PURPOSE:To properly set the minimum OFF period of a main switching element by forcing it to remain OFF for a certain period once the switching element is turned OFF. CONSTITUTION:A self-oscillation type switching power supply is composed of a rectifying/smoothig circuit 1, a switching transformer 2, a main switching element 3, a control circuit 5, a driver circuit 6, a detector 11 for DC output voltage, a photo-coupler 12 for the feedback of DC output voltage, a Zener diode 32, a comparator 33, a constant current source 34, etc. To control the switching element, its ON period is determined so as to stabilize DC output voltage Vout. A discharge circuit 40 is provided to supply the base current to a transistor 19. Accordingly, once the main switching element 3 is turned OFF, the OFF state is forcibly maintained for a certain period so that and the power supply can be operated stably for relatively low DC output currents.
JP17321487A 1987-07-10 1987-07-10 Self-oscillation type switching power supply Expired - Fee Related JP2506789B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP17321487A JP2506789B2 (en) 1987-07-10 1987-07-10 Self-oscillation type switching power supply

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP17321487A JP2506789B2 (en) 1987-07-10 1987-07-10 Self-oscillation type switching power supply

Publications (2)

Publication Number Publication Date
JPS6419969A true JPS6419969A (en) 1989-01-24
JP2506789B2 JP2506789B2 (en) 1996-06-12

Family

ID=15956241

Family Applications (1)

Application Number Title Priority Date Filing Date
JP17321487A Expired - Fee Related JP2506789B2 (en) 1987-07-10 1987-07-10 Self-oscillation type switching power supply

Country Status (1)

Country Link
JP (1) JP2506789B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04178232A (en) * 1990-11-08 1992-06-25 Showa Kogyo Kk Bent h-shape and manufacture of this h-shape

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04178232A (en) * 1990-11-08 1992-06-25 Showa Kogyo Kk Bent h-shape and manufacture of this h-shape

Also Published As

Publication number Publication date
JP2506789B2 (en) 1996-06-12

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Legal Events

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