JPS5619122A - Power circuit - Google Patents

Power circuit

Info

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
Application number
JP9374879A
Other languages
Japanese (ja)
Inventor
Tomohisa Yamada
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP9374879A priority Critical patent/JPS5619122A/en
Publication of JPS5619122A publication Critical patent/JPS5619122A/en
Pending legal-status Critical Current

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
JP9374879A 1979-07-25 1979-07-25 Power circuit Pending JPS5619122A (en)

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)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4672524A (en) * 1985-09-03 1987-06-09 Hitachi, Ltd. Overcurrent and overvoltage protected transistor inverter

Cited By (1)

* Cited by examiner, † Cited by third party
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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