JPS6419969A - Self-oscillation type switching power supply - Google Patents
Self-oscillation type switching power supplyInfo
- 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
Links
Landscapes
- Dc-Dc Converters (AREA)
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.
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)
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 |
-
1987
- 1987-07-10 JP JP17321487A patent/JP2506789B2/en not_active Expired - Fee Related
Cited By (1)
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 |