Magnetic leakage-preventing annular transformer

Abstract

The invention relates to a magnetic leakage-preventing annular transformer, which comprises an annular iron core, a primary coil and a secondary coil both of which are sequentially wound on the annular iron core. The annular iron core is a non-closed annular iron core provided with a gap; an insulated film is lined at the gap; an epoxy core is arranged at an inner circle of the annular transformer; an epoxy layer is arranged on the bottom surface of the annular transformer; the bottom surface of the epoxy layer is a flat surface; the epoxy core and the epoxy layer are integrated as a whole; the opposite surface of the gap is a flat surface; the gap is 0.02-0.12 mm in width; shielding layers are arranged between the primary coil and the secondary coil; the materials of the shielding layersare covered on the entire surface of the primary coil of the transformer; the shielding layers are uniform in width; and the shielding layers are overlapped and covered at 1 / 4 of the width of each shielding layer on the surface of the primary coil.

Description

technical field [0001] The invention relates to the field of electronics and electric equipment, in particular to an anti-magnetic flux leakage toroidal transformer. Background technique [0002] At present, EI type transformers are generally used as high-power transformers, which are formed by winding enameled wires on the skeleton, and then inserting silicon steel sheets into the skeleton. The reason is that the appearance and volume are large, which affects the installation space and weight of the product. In terms of use, due to the EI structure, there are large iron losses and copper losses, and large magnetic flux leakage during design, which makes the transformer efficiency low and temperature rise. , Noisy. [0003] There is also a toroidal transformer with an iron core without gaps, which is formed by winding a silicon steel sheet, wrapping an insulating layer, and then winding an enameled wire. The structure of a toroidal transformer without a gap in the iron core...

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Problems solved by technology

[0002] At present, EI type transformers are generally used as high-power transformers, which are formed by winding enameled wires on the skeleton, and then inserting silicon steel sheets into the skeleton. The reason is that the appearance and volume are large, which affects the installation space and weight of the product. In terms of use, due to the EI structure, there are large iron losses and copper losses, and large magnetic flux leakage during design, which makes the transformer efficiency low and temperature rise. , noisy

[0003] There is also a toroidal transformer with an iron core without gaps, which is formed by winding a silicon steel sheet, wrapping an insulating layer, and then winding an enameled wire. The structure of a toroidal transformer without a gap in the iron core is iron The core is wound with silicon steel sheets without gaps, and there is no shielding layer between the primary winding and the secondary winding of the transformer. In use, because the iron core has no gaps, the inrush current increases instantaneously after the transformer is energized.

The transformer and external electronic components are easily damaged, and the transformer is easily saturated due to voltage fluctuations during use, causing the transformer to heat up until it burns out

[0004] Since the inner hole of the transformer and the bottom surface of the transformer are not treated, the bottom surface of the transformer is uneven, causing resonance between the transformer and the installation panel, causing noise of the whole machine and damage to the polyester film insulation on the bottom surface of the transformer during manual moving, resulting in leakage of electricity on the bottom surface of the transformer. Electric Shock Hazard Caused by

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