| 20080232140 | System for transferring an alternating voltage into a direct voltage - A system for transferring an alternating voltage into a direct voltage includes a rectifier, a filter, a transformer, a switch, a switch control circuit and a voltage feedback circuit. The rectifier connects to a main power supply device and rectifies the alternating voltage into a transient direct voltage. The filter filters out a noise from the transient direct voltage and produces a filtering direct voltage. The transformer transfers the filtering direct voltage into a working direct voltage. The switch which has a turn-on status and a cutoff status is used to control the current which goes through the transformer. The switch control circuit is used to control the switch be in the turn-on status or the cutoff status. The voltage feedback circuit drives the switch controlling circuit in accordance with the transformer's voltage and diminishes a switching loss from the switch. | 09-25-2008 |
