POWER SUPPLY

摘要

The present invention discloses a DC power supply operable from an AC mains supply in a transient environment such as a power distribution system. A series connected capacitor (C1) and saturable inductor (L1) feed a full wave rectifier to supply a first DC/DC converter (15) having at least two output (Vs and Vo). A second DC/DC converter is supplied by the higher output (Vs) and is energised by a capacitor (C4) charged to voltage (Vs). The second DC/DC converter is switched in it output (Vo) falls due to momentary or prolonged interruption to the mains supply. The result is that the output (Vo) is held up.