Power supplying device in primary side of power circuit

Details Power supplying device in primary side of power circuit Power supplying device in primary side of power circuit

1998-03-09

2000-02-15

Han, Y. J.

Electric power conversion systems

Current conversion

Including automatic or integral protection means

363 41, H02H 710

Patent

active

060260017

ABSTRACT:
A power supplying device in a primary side of a power circuit is provided, including: a main power transformer including a coil for receiving DC output from a first rectifier, to be turned on/off according a PWM pulse output from a PWM IC, thereby inducing current, and for separately supplying the induced current; a power transistor for receiving DC power output from a second rectifier according to power off mode, to drop voltage, the second rectifier receiving and rectifying the current output from the main power transformer in DPMS mode operation; and a third rectifier for receiving and rectifying current induced through the coil inserted into the main power transformer in the normal operation, to supply power to the primary side of a power circuit. Current is induced through a separate coil to be used as the power of the primary side of the power circuit in the normal operation of the main power transformer, and, in the power off mode, a transistor of the power transistor drops voltage, solving problems in heat emission and thermal damage in the transistor due to large amount of voltage drop.

REFERENCES:
patent: 2841641 (1958-11-01), Faulk
patent: 2905491 (1959-05-01), Kim
patent: 5453921 (1995-09-01), Shutts
patent: 5812383 (1998-09-01), Majid et al.

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