Title:
OVERVOLTAGE PROTECTION CIRCUIT
Document Type and Number:
Japanese Patent JP3151805
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To constitute a zener diode with a relatively small rated power by stopping the oscillation of a transformer momentarily when the zener diode fails due to short circuit even if the zener diode is connected to any line of a secondary side output.
SOLUTION: A zener diode D9 is provided between the base terminal of a transistor Q3 for stopping transistors Q1 and Q2 for oscillating a transformer T1 and a rectification diode D2 for rectifying pulses from a drive coil L2, thus enabling the transistor Q3 to momentarily react with a small amount of fluctuation of pulses from the drive coil L2 due to a small amount of fluctuation at a secondary side load and hence turning on the transistor and hence stopping the oscillation of the transformer T1 momentarily.
Inventors:
Hajime Miyamoto
Takahiro Ogawa
Takahiro Ogawa
Application Number:
JP28046796A
Publication Date:
April 03, 2001
Filing Date:
October 23, 1996
Export Citation:
Assignee:
Funai Electric Co., Ltd.
International Classes:
H01F27/42; H02H7/04; H02H7/12; H02H9/04; H02M3/28; H02M3/338; (IPC1-7): H02M3/28; H01F27/42; H02H7/04; H02H9/04; H02M3/338
Other References:
【文献】登録実用新案3011984(JP,U)