POWER SUPPLY DEVICE FOR A MODEM WHICH ARRANGES A NOISE ELIMINATION FILTER BETWEEN A PRIMARY SIDE RECTIFIER UNIT AND A SWITCHING UNIT

摘要

PURPOSE: A power supply device for a modem is provided to eliminate noise by eliminating Y-cap which interlinks a primary side and a secondary side.;CONSTITUTION: A primary side rectifier unit(210) rectifies an AC power source. A switching unit(220) selectively sanctions an output of the primary side rectifier unit. A switching controller(230) sanctions an operation signal to the switching unit. A transformer(240) transforms voltage of the primary side rectifier unit and outputs. A secondary side rectifier unit(250) rectifies the output of the transformer. A constant voltage controller detects output voltage of the secondary side rectifier unit and sanctions the output voltage to the switching controller.;COPYRIGHT KIPO 2012