Abstract: Electronic laboratory notebook (ELN) system (1), comprises an ELN managing application (3) of an ELN service provider and being accessible for clients via the Internet and being configured for managing the access of the clients on the electronic laboratory notebook represented by ELN data in an ELN database hosted by the ELN service provider, a client computer (2) being located on premises of the client and connected to the internet (4), the client computer (2) running a client software (7) to communicate with the ELN managing application (3) via the Internet (4), a local storage server (5) being located on premises of the client, the local storage server being configured for storing ELN-files, which include content of the ELN, and the ELN application (3) being configured for controlling, in dependence on the client's access rights, the transfer of the ELN-files between the local storage server and the client computer.

Abstract: The invention relates to an Electronic laboratory notebook (ELN) system, and a method for managing an ELN system, which respectively allow locally stored files, disconnected from the interne, to be used and served by a remotely hosted website on the internet.

Abstract: In a switched-mode power supply, when the controller and the switching device are encapsulated together with a heat sink, in which the drain of the switching device is connected to the heat sink, the heat sink and the paths to the various pins of the controller forms various parasitic capacitances which, when the switching device switches, injects and withdraws inordinately large currents into and from the pins of the controller. In the case of the V.sub.CTRL pin to which is connected a discharge capacitor, the resulting under voltage across the capacitor may be used by circuitry connected to the V.sub.CTRL pin to control the switching of the switching device resulting in throwing the switched-mode power supply out of regulation. A track-and-hold circuit is now connected between the V.sub.CTRL pin and the circuitry to mirror the voltage across the discharge capacitor.

Abstract: A sample-and-hold circuit is provided for a switched-mode power supply of the type having a transformer with a primary winding, an auxiliary winding and a secondary winding, with a switching transistor coupled in series with the primary winding and a sample-and-hold capacitor for storing a voltage proportional to an output voltage of the auxiliary winding and coupled to a controlled terminal of the switching transistor in a feedback loop which normally operates in a closed-loop mode for switchably regulating the power supply. To prevent the feedback loop from being driven to an open-loop or "stuck" mode of operation, a discharge capacitor is provided which is switchably coupled in parallel with the sample-and-hold capacitor to discharge excess voltage from the sample-and-hold capacitor and thereby restore the feedback loop to its normal closed-loop operating mode.

Abstract: An overvoltage protection circuit is provided for a switched-mode power supply of the type having a transformer with a primary winding, an auxiliary winding, and a secondary winding, with a switching transistor coupled in series with the primary winding. The overvoltage protection circuit includes a sensing resistor having a first terminal directly connected to the auxiliary winding for generating a current proportional to the voltage across the auxiliary winding, with a second terminal of this resistor being coupled to an input of a current mirror. The reflected current output of the current mirror is compared to an overvoltage reference current generated by an overvoltage reference current source by means of a current comparator, and a circuit is provided to generate a signal to turn off the switching transistor when the reflected current exceeds the overvoltage reference current.