JPS6474059A - Self-exciting switching power source - Google Patents

Self-exciting switching power source

Info

Publication number
JPS6474059A
JPS6474059A JP22899087A JP22899087A JPS6474059A JP S6474059 A JPS6474059 A JP S6474059A JP 22899087 A JP22899087 A JP 22899087A JP 22899087 A JP22899087 A JP 22899087A JP S6474059 A JPS6474059 A JP S6474059A
Authority
JP
Japan
Prior art keywords
emitter current
self
circuit
power source
switching power
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.)
Granted
Application number
JP22899087A
Other languages
Japanese (ja)
Other versions
JPH065988B2 (en
Inventor
Yukinori Sato
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.)
NEC Corp
Original Assignee
NEC Corp
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 NEC Corp filed Critical NEC Corp
Priority to JP22899087A priority Critical patent/JPH065988B2/en
Publication of JPS6474059A publication Critical patent/JPS6474059A/en
Publication of JPH065988B2 publication Critical patent/JPH065988B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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Abstract

PURPOSE:To protect a short-circuited portion reliably, by constructing a self-excited switching power source such that the limit level of emitter current is high under normal state and low under abnormal state such as short circuit of output. CONSTITUTION:A self-exciting switching power source comprises a switching transformer 4 having a main primary winding 1, a base drive winding 2 and a secondary winding 3, a switching transistor(Tr)5, a base drive circuit 6, an emitter current limiting circuit 7 and a secondary rectifying/smoothing circuit 8. The limiting circuit 7 comprises a Zener diode 16, resistors 14, 15, a capacitor 13 and a diode 12, and the base voltage of Tr11 is normally negative. Under abnormal state such as short circuit of output, Tr11 is turned OFF to limit emitter current of Tr5 so as to lower voltage of the base drive winding, thus decreasing negative voltage across the capacitor 13 and increasing base voltage of Tr11. Consequently, Tr11 is turned ON to limit emitter current of Tr5.
JP22899087A 1987-09-11 1987-09-11 Self-excited switching power supply Expired - Lifetime JPH065988B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP22899087A JPH065988B2 (en) 1987-09-11 1987-09-11 Self-excited switching power supply

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP22899087A JPH065988B2 (en) 1987-09-11 1987-09-11 Self-excited switching power supply

Publications (2)

Publication Number Publication Date
JPS6474059A true JPS6474059A (en) 1989-03-20
JPH065988B2 JPH065988B2 (en) 1994-01-19

Family

ID=16885037

Family Applications (1)

Application Number Title Priority Date Filing Date
JP22899087A Expired - Lifetime JPH065988B2 (en) 1987-09-11 1987-09-11 Self-excited switching power supply

Country Status (1)

Country Link
JP (1) JPH065988B2 (en)

Also Published As

Publication number Publication date
JPH065988B2 (en) 1994-01-19

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