JPS5697117A - Switching power supply device - Google Patents
Switching power supply deviceInfo
- Publication number
- JPS5697117A JPS5697117A JP9117979A JP9117979A JPS5697117A JP S5697117 A JPS5697117 A JP S5697117A JP 9117979 A JP9117979 A JP 9117979A JP 9117979 A JP9117979 A JP 9117979A JP S5697117 A JPS5697117 A JP S5697117A
- Authority
- JP
- Japan
- Prior art keywords
- current
- power supply
- transistor
- switching power
- voltage
- 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.)
- Pending
Links
Landscapes
- Dc-Dc Converters (AREA)
Abstract
PURPOSE: To suppress a short circuit current, by controlling and lowering the input voltage when the output voltage is a set value or lower.
CONSTITUTION: When a switching power supply 31 is over-loaded and the output voltage is lower than the set value, a constant voltage diode 32 is OFF, the diode current of a photo coupler 25 is reduced, and the transistor 25 of the coupler approaches OFF. Thus, the base current of the transistor 22 starts flowing and the potential of the capacitor 20 is lowered, resulting in increasing the output of an operational amplifier 16. With the increase in the output, the base current of a transistor 12 flows, the base potential of a transistor 10 is lowered toward OFF. A voltage between the collector and the emitter is increased, the input voltage of the switching power supply 31 is lowered, and the current at short-circuit can be suppressed. At the same time, with this constitution, the rush current at the application of power supply is suppressed.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9117979A JPS5697117A (en) | 1979-07-17 | 1979-07-17 | Switching power supply device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9117979A JPS5697117A (en) | 1979-07-17 | 1979-07-17 | Switching power supply device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5697117A true JPS5697117A (en) | 1981-08-05 |
Family
ID=14019222
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9117979A Pending JPS5697117A (en) | 1979-07-17 | 1979-07-17 | Switching power supply device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5697117A (en) |
-
1979
- 1979-07-17 JP JP9117979A patent/JPS5697117A/en active Pending
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