Switch mode power supply circuit

Details Switch mode power supply circuit Switch mode power supply circuit

1994-09-30

1997-04-15

Wong, Peter S.

Electric power conversion systems

Current conversion

With condition responsive means to control the output...

363 21, 363 49, H02M 75375

Patent

active

056216327

ABSTRACT:
In a switch mode power supply of a video apparatus, a capacitor develops a supply voltage that is coupled to a main current conducting electrode of a driver transistor. The driver transistor drives a switching power transistor. An arrangement charges the charging capacitor when the video apparatus operates in standby mode. A delay circuit introduces a delay time between a time when the capacitor begins to be charged and the time when a switching control signal is applied to the driver transistor for operation in a run mode. Consequently, the capacitor develops sufficient voltage that insures sufficient base current to turn on the power transistor in to saturation prior to the time the switching control signal is applied to the driver transistor. Thus, a possible damage to the power transistor is prevented.

REFERENCES:
patent: 4058738 (1977-11-01), Udvardi-Lakos
patent: 4429259 (1984-01-01), Luz
patent: 4679131 (1987-07-01), Filliman
patent: 4734771 (1988-03-01), Lendaro et al.
patent: 5291386 (1994-03-01), Wu

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