Topic
Isolation transformer
About: Isolation transformer is a research topic. Over the lifetime, 8145 publications have been published within this topic receiving 72396 citations.
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25 Aug 2004
TL;DR: The LLC serial resonance DC/DC converter includes a bleeder capacitor, an inverter composed of four serial switches, a resonance circuit, a clamp, an isolation transformer, a commutating circuit and a filter, capable of realizing large input/output voltage regulation sphere with small frequency variable sphere by LLC resonance circuit with dual intrinsic resonance frequency as discussed by the authors.
Abstract: This invention LLC serial resonance DC/DC converter includes a bleeder capacitor, an inverter composed of four serial switches, a resonance circuit, a clamp, an isolation transformer, a commutating circuit and a filter, capable of realizing large input/output voltage regulation sphere with small frequency variable sphere by LLC resonance circuit with dual intrinsic resonance frequency, at the same time, the switch is effectively clamped by a pair of clamp diodes, so that each switch voltage stress is half of the input voltage and ZVS is realized in all sphere without any additional circuit, the commutation diode works at the ZCS state.
26 citations
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TL;DR: A current-reuse hybrid-coupled oscillator is proposed, which is based on a three-winding tapped isolation transformer and improves both output power and silicon area occupation with respect to previous works.
Abstract: This brief presents a fully integrated dc–dc converter consisting of only two CMOS chips, which are a power oscillator with an integrated transformer and a full-bridge rectifier. A thick inter-metal oxide layer guarantees a galvanic isolation rating as high as 5 kV. A current-reuse hybrid-coupled oscillator is proposed, which is based on a three-winding tapped isolation transformer and improves both output power and silicon area occupation with respect to previous works. The converter is operated at 5-V power supply and is able to deliver up to 300-mW dc power at 10-V output voltage while exhibiting a power density and a power efficiency of 36 mW/mm2 and 24%, respectively.
26 citations
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28 Jul 1988TL;DR: In this paper, a switching power source having a series connection composed of a main transformer, a current-suppressing inductance element, and a switching element is described, in which output windings are additionally wound on the main transformer and the inductance elements respectively and those output wound wires are connected in series to each other so as to form an auxiliary power source for a control circuit for driving/controlling the ON-OFF of the switching element.
Abstract: Disclosed is a switching power source having a series connection composed of a main transformer, a current-suppressing inductance element, and a switching element and connected across a DC input power source, in which output windings are additionally wound on the main transformer and the inductance elements respectively and those output windings are connected in series to each other so as to form an auxiliary power source for a control circuit for driving/controlling the ON-OFF of the switching element, and a starting circuit is provided to supply power from the DC input power source to the control circuit only during the starting time of the switching power source.
26 citations
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TL;DR: A novel voltage source full-bridge DC-DC converter with phase shift modulation using a high-frequency cycloconverter with zero-voltage and zero-current switching operations and the steady-state operation principles of the converter are analysed and discussed.
Abstract: A novel voltage source full-bridge DC-DC converter with phase shift modulation using a high-frequency cycloconverter is proposed. Both zero-voltage and zero-current switching (ZVZCS) commutation for full-bridge active power switches and zero-voltage switching operation for cycloconverter bi-directional switches are obtained. Soft switching operation is provided in a wide range of voltage regulation without utilising an auxiliary inductor in the primary side of an isolating transformer. To implement this DC-DC converter as a multi-function DC–AC inverter, a reference signal is traced by the control system to adjust the output voltage according to the variations of the reference signal. Therefore desired output waveforms are provided by selected reference signals. Hence the proposed circuit operates as a multi-function converter. Based on the simulation and experimental results, the steady-state operation principles of the converter are analysed and discussed. Experimental results from a 24 V-DC input and 20 kHz fixed switching frequency laboratory prototype is presented to introduce both the switching operation and the multi-function performance of the converter.
26 citations
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16 Jul 1993
TL;DR: In this paper, a high frequency electronic ballast (128) having a transformer (104) in which the transformer has a primary winding (106) which is coupled to a secondary winding (108) via a primary flux path (1) from which flux can be diverted by a secondary flux path, including an air gap (114) which can be adjustable.
Abstract: A high frequency electronic ballast (128) having a transformer (104) in which the transformer (104) has a primary winding (106) which is coupled to a secondary winding (108) via a primary flux path (1) from which flux can be diverted by a secondary flux path (2) including an air gap (114) which can be adjustable. Use of the transformer (104) permits load operation from a rectified alternating current power source which can be compensated by a high frequency power supply (192) to present a favorable power factor to the alternating current supply.
26 citations