JPS55121512A - Power unit - Google Patents
Power unitInfo
- Publication number
- JPS55121512A JPS55121512A JP2834779A JP2834779A JPS55121512A JP S55121512 A JPS55121512 A JP S55121512A JP 2834779 A JP2834779 A JP 2834779A JP 2834779 A JP2834779 A JP 2834779A JP S55121512 A JPS55121512 A JP S55121512A
- Authority
- JP
- Japan
- Prior art keywords
- constant voltage
- output
- voltage output
- relay
- load
- 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
- Continuous-Control Power Sources That Use Transistors (AREA)
Abstract
PURPOSE: To protect a load from an abnormal voltage by stopping the supply of a constant voltage output to the load by opening a switching circuit according to the result of a comparison between the output voltage of the switching circuit and a reference voltage.
CONSTITUTION: When AC power is applied to terminal 32, relay 44 is driven by a charging current to capacitor 43 only in start operation to make contact 54, thereby supplying the constant voltage output to terminal 69. Further, comparator 61 is applied with a divided voltage of the constant voltage output and a reference voltage across Zener diode 47 and when the constant voltage output is normal, relay 55 operates to make its contact 57. Similarly, relay 56 also operates to make its contact 58. Then when a short circuit is formed across a load to lower the constant voltage output, relays 55 and 56 are reset to break contacts 57 and 58. Furtheremore, if the constant voltage output would increase up to a high voltage, neither comparator 61 nor 64 generates any output and contacts 57 and 58 are similarly broken.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2834779A JPS55121512A (en) | 1979-03-12 | 1979-03-12 | Power unit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2834779A JPS55121512A (en) | 1979-03-12 | 1979-03-12 | Power unit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS55121512A true JPS55121512A (en) | 1980-09-18 |
Family
ID=12246061
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2834779A Pending JPS55121512A (en) | 1979-03-12 | 1979-03-12 | Power unit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS55121512A (en) |
-
1979
- 1979-03-12 JP JP2834779A patent/JPS55121512A/en active Pending
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