JPS5619122A - Power circuit - Google Patents
Power circuitInfo
- Publication number
- JPS5619122A JPS5619122A JP9374879A JP9374879A JPS5619122A JP S5619122 A JPS5619122 A JP S5619122A JP 9374879 A JP9374879 A JP 9374879A JP 9374879 A JP9374879 A JP 9374879A JP S5619122 A JPS5619122 A JP S5619122A
- Authority
- JP
- Japan
- Prior art keywords
- transistor
- circuit
- voltage
- power circuit
- increased
- 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
Abstract
PURPOSE: To prevent the overcurrent destruction, by turning off the transistor connected to the output of the charging circuit when the switching operation is repetitively stopped for a given time or more and cutting off the main transistor.
CONSTITUTION: During normal operation of the power circuit, the charged voltage of the capacitor 12 of the additional circuit 10 is increased in synchronizing with the oscillation frequency of the oscillation circuit 1, but the transistor 13 is not reached to the turn-off voltage. If the oscillation is stopped due to defective component or improper connection of the power circuit, the cut-off of the driving transistor is fixed and the collector current i of the main transistor 3 is increased. This current i is rapidly increased by the saturation of the transistor 4. But, after the time t1 is elapsed, the transistor 13 turns off and the voltage v1 is decreased. As a result, the main transistor 3 is cut off, the collector current is zero and the prevention of destruction is enabled.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9374879A JPS5619122A (en) | 1979-07-25 | 1979-07-25 | Power circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9374879A JPS5619122A (en) | 1979-07-25 | 1979-07-25 | Power circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5619122A true JPS5619122A (en) | 1981-02-23 |
Family
ID=14091036
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP9374879A Pending JPS5619122A (en) | 1979-07-25 | 1979-07-25 | Power circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5619122A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4672524A (en) * | 1985-09-03 | 1987-06-09 | Hitachi, Ltd. | Overcurrent and overvoltage protected transistor inverter |
-
1979
- 1979-07-25 JP JP9374879A patent/JPS5619122A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4672524A (en) * | 1985-09-03 | 1987-06-09 | Hitachi, Ltd. | Overcurrent and overvoltage protected transistor inverter |
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