JPS5537859A - Protection circuit for switching regulator - Google Patents
Protection circuit for switching regulatorInfo
- 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
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
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)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5854413A (en) * | 1981-09-29 | 1983-03-31 | Fujitsu Ltd | Switching regulator |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5534885A (en) * | 1978-09-04 | 1980-03-11 | Toko Inc | Switching regulator |
-
1978
- 1978-09-06 JP JP53110289A patent/JPS5836589B2/en not_active Expired
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5534885A (en) * | 1978-09-04 | 1980-03-11 | Toko Inc | Switching regulator |
Cited By (2)
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 |
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