Type-C portable charger capable of reducing common-mode interference and transformer of Type-C portable charger

Abstract

The invention discloses a Type-C portable charger capable of being automatically produced and reducing common-mode interference, a transformer and a winding method of the Type-C portable charger. The charger comprises the transformer and a winding structure of the transformer, wherein the transformer is in an EE-type structure, of which the effective sectional area of a magnetic core is greater than or equal to 40 square millimeters and which is small in size and low in cost; the winding structure of the transformer comprises a main winding, an auxiliary wining, a shielding winding and a secondary winding; the main winding is divided into a plurality of sub-windings which are connected in parallel and reduce the common-mode interference by reducing a voltage difference between an initial line and a tail line of the main winding; the sub-windings are in a structure that the sub-windings are individually and tightly wound for one layer; two fine lines, of which the sum of the sectional area is equal to the sectional area of a required single thick line and which can be automatically wound by a winding machine, are adopted by the secondary winding for winding; and outgoing lines of the secondary winding are suspended on PINs of a transformer skeleton, and are distributed at the top part and the bottom part of the transformer skeleton respectively, so as to meet the safe specified distance. Procedures and participants are reduced; the time is saved; winding packets are reduced; and the automatic degree is improved.

Description

technical field [0001] The invention relates to a Type-C transformer capable of reducing common-mode interference, a winding method thereof, and a portable charger including the transformer that can be produced automatically. Background technique [0002] With the continuous development of science and technology, chargers with USB Type-C interface will be popularized in a short time and widely used in mobile devices such as mobile phones and tablets. Small size, high efficiency, energy saving and environmental protection. For example, USB3.1 supports the USB-PD (PowerDelivery) power supply standard, and the maximum power supply can reach 100 watts, which can charge mobile devices faster and substantially improve the charging speed. In the prior art, such chargers usually use For RM8 and PQ20 transformers with high power and large volume, the chargers are large and inconvenient to carry; because of their large output current, the secondary windings use thick wires and flying...

AI Technical Summary

Problems solved by technology

Figure 5 is the schematic diagram of the main winding circuit in the prior art, correspondingly, the main winding 10 usually adopts image 3 The winding method shown, that is, the U-shaped winding method, winds 2 layers or more than 2 layers, and the pressure difference between the first turn and the last turn at the same vertical position is relatively large; the winding skeleton with a width of 6.2mm For example, if a wire with a diameter of 0.21mm is used to wind a 56TS, two layers need to be arranged, and if a wire with a diameter of 0.11mm is used to wind a 56TS, only one layer needs to be arranged. However, because the Type-C transformer needs to pass a large current, in order to meet the requirements Generally, two 0.11mm wires are wound in parallel to withstand the passing current. Two 0.11mm wires are wound up and down in parallel to make 56TS. The winding wire of the main winding is still at the same vertical position. 2 layers, the voltage difference between the first turn and the second turn next to the winding bobbin 90 at the same vertical position is very large, that is, the slope of the interference voltage between them is very large, and the interlayer capacitance is large, that is, the interference formed is more Large, the common mode interference caused by coupling to the secondary is relatively large, such as Figure 7 As shown in the middle curve A, the noise level is high and the interference is large. Usually, it is necessary to add components such as filters and inductors to suppress common-mode interference, and the manufacturing cost is high.

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