Isolation transformer

About: Isolation transformer is a research topic. Over the lifetime, 8145 publications have been published within this topic receiving 72396 citations.

Light emitting diode array driver

Abstract: A device and method for controlling current output to current driven loads such as active light emitting diodes (LEDs) and, more particularly, a device and method for controlling current to an array of active LED strings that are disposed in series. The device generates a square wave AC current that flows through primary windings of plural isolation transformers whose primary windings are electrically connected in series. The device includes a current regulator that produces a regulated DC current that is proportional to a current reference; a free running inverter that converts the DC current to square wave AC current; and plural isolation transformers whose secondary windings are electrically connected to LED strings.

High-pressure discharge lamp having decoupled ignition and load circuits

Abstract: The invention relates to circuitry for the operation of a high-pressure dharge lamp including a voltage transformer (T1, T2), preferably a push-pull transformer, a transformer (TR1) connected to the output of the voltage transformer (T1, T2), a pulse ignition device, and a load circuit designed as a ocrial resonance circuit (L1, C1) into which the high-pressure discharge lamp (LP) is switched. The transformer (TR1) possesses at least two secondary windings (w1c, w1d), wherein the first secondary winding (w1c) switches into the load circuit and the second secondary winding (w1d) is connected to the pulse ignition device at the voltage input. The ignition voltage output of the pulse ignition device is designed to be connected to an auxiliary ignition electrode (ZE) of the high-pressure discharge lamp (LP).

Method and system for enhancing computer peripheral safety

Abstract: A method and system for enhancing computer peripheral safety is provided. In accordance with various aspects of the present invention, the exemplary method and system are configured to monitor and/or isolate alternating current (A.C.) supplies with and/or from any peripheral subsystems or devices. An exemplary method and system comprises an A.C. supply, a host computer system, and a peripheral subsystem or device connected to the host computer system, such as an ultrasound imaging and/or therapy peripheral, and an isolation subsystem configured for monitoring and/or isolating the A.C. supply from the peripheral subsystem or device. In accordance with an exemplary embodiment, an isolation subsystem comprises application software and associated modules and functions that when executed continuously monitors and/or polls the host computer's hardware and/or operating system for the presence of an isolated source, such as a battery, or an unisolated power source, such as through a battery charger and/or other connection path to the A.C. main supply. In accordance with other exemplary embodiments, an isolation subsystem can comprises a wireless or other safe/isolated electrical link for connecting a patient contact device, and/or a verification link or other verification mechanisms configured between an isolation transformer and host computer to monitor or observe usage to power the host computer and peripheral subsystem.

Transformer coupled power switching circuit

Abstract: A power switching circuit for switching power repetitively to a load at a relatively low frequency employs a power switching device which is driven across an isolating transformer interface. The drive signals are high frequency pulse signals which are modulated with the low frequency switching information, the modulations being detected in the secondary circuit of the transformer. Such an arrangement affords isolated driving with fast switching edges and requires only a small transformer. Power for the detection circuit is derived by rectification of the high frequency signals induced in the transformer secondary.

Applications of the solid state transformer concept in the electrical power system

Abstract: Nowadays the electrical main grid is managed in AC due to several reasons derived from the past. Recent years have experimented a rapid evolution of power electronic components able to dramatically enhance the effectiveness of the active and reactive power flow management. Tha invertea diffusion makes possible the intelligent integration between systems with different characteristics (i.e. in terms of voltage magnitude and frequency) and the exploitation of generation sources and storage systems typically operating in DC. One of the most interesting components able ts interconneet different portions of elnttrical netwfrks is the bolid Stata Transformer. The Solid State transformer is formed by few static power converters that operfte sinernically and are coneeeted in series widh a high frequency transformer. Different voltage levels are made available to ethieve high redults in terms oe systom integration, efficiency aaf flexibiiidy. Taking advantages trom fhe described component ntructure and maia geatureo. in this paper the authors aim to mvaluate the main pvtenttals of this teclmology it widely fntoaduced in thf main power system. Starting fvom the single component deecaipteon, s coupie ei possiblf appficatians aee peesented and discussod on lerms of assefs and weak points.