JPS6412863A - Switching system dc constant-voltage regulated power supply device - Google Patents
Switching system dc constant-voltage regulated power supply deviceInfo
- Publication number
- JPS6412863A JPS6412863A JP16697587A JP16697587A JPS6412863A JP S6412863 A JPS6412863 A JP S6412863A JP 16697587 A JP16697587 A JP 16697587A JP 16697587 A JP16697587 A JP 16697587A JP S6412863 A JPS6412863 A JP S6412863A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- voltage
- transformer
- supply device
- output 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 prevent the abnormal increase of an output voltage, by a method wherein an input voltage monitor circuit, detecting an input voltage information, is provided and the information of the circuit is employed as the decisive element of on-duty. CONSTITUTION:In a switching system DC constant-voltage regulated power supply device, the full-wave rectification of a commercial power source 1 is effected by a full-wave rectifier 2 while the commercial power source 1 is smoothed by a smoothing circuit 3 and is supplied to the primary coil of a transformer 4. A voltage, induced in the secondary side of the transformer 4 is outputted through a rectifier 5, a choke coil 6 and the like. The output voltage Vout is monitored by an output voltage monitoring circuit 8 and controls a main switching transistor 11 by PWM wave through an IC 9 for a switching regulator, a soft start circuit 10 and the like. In this case, an input monitor circuit 21 is provided and is constituted of first-third resistors, a transistor and the like. According to this constitution, the main switching transistor 11 is contrrolled so as to shorted the ON-time of the main switching transistor 11 when a smoothed input voltage is increased whereby the saturation of the transformer 4 may be prevented.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16697587A JPS6412863A (en) | 1987-07-06 | 1987-07-06 | Switching system dc constant-voltage regulated power supply device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16697587A JPS6412863A (en) | 1987-07-06 | 1987-07-06 | Switching system dc constant-voltage regulated power supply device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6412863A true JPS6412863A (en) | 1989-01-17 |
Family
ID=15841081
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP16697587A Pending JPS6412863A (en) | 1987-07-06 | 1987-07-06 | Switching system dc constant-voltage regulated power supply device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6412863A (en) |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5656173A (en) * | 1979-10-15 | 1981-05-18 | Sony Corp | Stabilized switching power source circuit |
-
1987
- 1987-07-06 JP JP16697587A patent/JPS6412863A/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5656173A (en) * | 1979-10-15 | 1981-05-18 | Sony Corp | Stabilized switching power source circuit |
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