Abstract: Methods and systems, including computer program products, for active file change notification. A system in accordance with the invention includes a recorder that records changes to one or more files in a file system and a broker that receives and responds to change notification request from external applications. The recording of changes can be system-initiated and can pertain to changes occurring anywhere in the file system. The recorder and broker can perform asynchronously from each other and can persist independently of the external applications.

Abstract: Ripple canceling, soft switching isolated DC/DC converters with reduced voltage stress synchronous rectification. The converters include interleaved switching converters providing power to a node supplying power to a zero volt switching bi-phase power conversion stage driving synchronous rectifiers feeding an output filter. In one embodiment, the interleaved converters are boost mode converters operating in continuous conduction mode boost converters. Various embodiments are disclosed.

Abstract: A modular power supply system (10) is provided for providing a multiplicity of output voltages from a plurality of respective converter modules (70a-70n). Each of the converter modules (70a-70n) has an input coupled to a DC high voltage bus (22) from which a respective output voltage is generated. The voltage supplied on DC bus (22) is generated by a power factor corrected boost converter circuit (20) which is coupled to an AC input source (12). Further, a battery backup module (40) is coupled to the high voltage DC bus (22) for supplying backup power whenever the bus voltage drops below a predetermined level.

Abstract: A voltage regulation circuit that receives power at an unregulated voltage and supplies power at a regulated voltage to an external circuit. The regulation circuit includes two modules each including a regulator, controlled by a common control, the modules supplying power to the external circuit in tandem. Each module includes a switch and control circuitry that cuts it off from the external circuit if its voltage is outside of a selected range.