Isolation transformer

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

Rotary power transformer for use in a high-voltage generator circuitry for inductively transmitting two or more independently controllable supply voltages to the power supply terminals of a load

Abstract: The present invention refers to a high-voltage power supply circuit for inductively transmitting electrical energy from a stationary part to a load on a rotary part which requires a non- symmetrical voltage transfer, for example, an X-ray tube of an X-ray computed tomography device. The circuit may be realized as a resonant-type power converter circuit with a single rotary power transformer (500) or more than one such power transformer, where at least two separate DC/AC power inverter stages provide two individually controllable AC input voltages (U1, U2) to different windings (511, 512) of a multi-primary coil belonging to the rotary power transformer. Two output voltages supplied by the multi-secondary coil (521, 522, 523, 524) of said transformer which are derived from the two individually controllable AC input voltages are fed to the tube electrodes for powering the X-ray tube.

Low leakage current electrical isolation system

Abstract: The disclosed invention presents an isolated electrical distribution system which includes at least a pair of power lines for providing a source of alternating voltage, one of the lines being connected to electrical ground, which are connected across the primary winding of an isolation power transformer, and at least a second pair of lines, neither of which is connected to said ground potential, wired to an electrical outlet or load and connected across the secondary winding of the transformer. The isolation transformer, housed in a metal enclosure, includes a magnetic core, a primary winding formed in a coil, a secondary winding formed in a separate coil with the coils mounted on the magnetic core on one side of the primary, with the turns of one coil wound in a clockwise direction relative to the core and the windings of the other coil wound in a counterclockwise direction relative to the core; another secondary winding formed in a separate coil and mounted on the core on the other side of the primary coil; and thin flat nonmagnetic metal shield members, each having a slot therethrough, are fitted over the magnetic core and sandwiched in between each of the two secondary coils and the primary coil. As described, leakage currents between the primary and secondary windings and between the secondary windings to ground is minimized with concurrent reduction in stray magnetic fields.

Explosive magnetic field compression generator transformer power supply for high resistive loads

Abstract: An explosive flux compression generator is coupled to a high resistance load by a pulse transformer. Chemical energy is converted to electromagnetic energy and is transferred by means of the transformer to the high resistance load. The transformer allows coupling to a higher resistive load than is achieved with a transformerless-generator system having a current gain greater than unity.

RF isolation for power circuitry

Abstract: System and method for providing isolated power to a component that is also subject a set of RF signals that includes at least a first RF signal having a first RF frequency is provided. There is included providing a DC voltage signal and modulating the DC voltage signal into an isolated power signal using an isolation transformer. The isolated power signal has an intermediate frequency that is higher than 60 Hz and lower than the first RF frequency. There is included supplying the DC voltage signal to the primary winding and obtaining the isolated power signal from the secondary winding; and delivering the isolated power to the component using the isolated power signal.

A highly accurate, hand-held clamp-on current transformer

Abstract: The design, operation, and performance of a 1000:5 A highly accurate, hand-held, clamp-on-type current transformer are presented. This precision current transformer uses a sensitive magnetic circuit to detect transformer ampere-turn unbalance between the primary and secondary circuits. The unbalance represents an error in the ratio and phase angle of the transformer. The largest of the errors is due to the core magnetization current and magnetic reluctance caused by the cutting of the core material. After sensing the errors, electronic feedback through a magnetic circuit is used to provide an error-correcting current. This reduces the overall errors dramatically. These types of devices are referred to as "active" current transformers because of the use of electronic amplifier and feedback circuits. The device described has a novel feature of an openable, split core. This "clamp-on" capability enables use of the transformer on a bus or cable without the complications or need to open the current-carrying circuit to be measured. Commonly used "clamp-on"-type current transformers generally have uncertainties from about 1 to 5% at full-scale rated current. This paper describes a commercialization of active current transformers having a ratio uncertainty of less than /spl plusmn/0.05% over a current range from full-scale rated to 1% of full-scale. Additionally, this product has a small phase angle which is an important consideration when measuring electric power, energy, and power factor. It is intended to be used by electric utilities, standards laboratories, testing laboratories, and in applications where high measurement accuracy and the split-core, clamp-on feature are attractive considerations.