A power supply assembly including an alternating current primary source connection, a direct current secondary source connection, an alternating current load connection, a DC link, a direct-current converter connected electrically between the secondary source connection and the DC link, and a load supply converter connected electrically between the DC link and the load connection. The power supply assembly includes a trickle charger converter connected electrically between at least one alternating current connection and the secondary source connection, a nominal power of the trickle charger converter being less than nominal powers of the direct-current converter and the load supply converter.