An Adjustable Leakage Inductance Planar Transformer with Half Turn Winding

Abstract

The invention relates to an adjustable leakage inductance planer transformer for a half-turn coil winding. The adjustable leakage inductance planer transformer comprises an E-shaped magnetic core, anI-shaped magnetic core, a primary coil winding, secondary side windings U1 and U2, rectifier tubes D1 to D4 and filter capacitors C1 to C4, wherein the primary side winding is wound on a side column and a middle column of the E-shaped magnetic core; two U-shaped windings of each secondary side winding are overlapped in a transformer window in opposite directions; four ports of the two U-shaped windings of each secondary side winding are connected with one end of the corresponding rectifier tube respectively; the other end of each rectifier tube is connected with one end of the corresponding filter capacitor; the other end of each filter capacitor is connected with a center tap of the corresponding U-shaped winding; and E-shaped magnetic core and the I-shaped magnetic core are buckled. According to the adjustable leakage inductance planer transformer, the number of turns of each secondary side winding can be equivalent to 0.5, so that the number of turns of the primary side becomes halfwhen the number of turns of each secondary side winding is 1, the winding volume and processing difficulty of the transformer are greatly reduced, and the power density is improved.

Description

technical field [0001] The invention relates to an adjustable leakage inductance planar transformer with a half-turn winding, which belongs to the field of electromagnetic technology. Background technique [0002] Due to its small size, planar transformers are often used in applications that require high power density. Among them, the LLC resonant converter is widely used in high-end power supplies and busbar converters because of its easy realization of soft switching, high efficiency and power density. [0003] The LLC resonant converter generally includes a front-stage full-bridge / half-bridge inverter circuit, a resonant capacitor, a resonant inductor, a transformer and a secondary rectification and filtering circuit. LLC resonant converters are often used in applications with large voltage transformation ratios such as 400V to 12V, so the transformer transformation ratio can reach 16 or higher. [0004] For topologies such as the LLC resonant converter, in order to red...

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Problems solved by technology

[0005] The invention provides an adjustable leakage inductance planar transformer with a half-turn winding, which is used to solve the problem of too many turns of the primary winding of the planar transformer with a large transformation ratio applied to LLC resonant converters and other occasions, and the window area is insufficient.

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