Magnetic core, integrated magnetic element, active clamp forward-flyback circuit and switch power supply

Abstract

The present invention discloses a magnetic core, an integrated magnetic element comprising the above-described magnetic core, an active clamp forward-flyback circuit comprising the above-described integrated magnetic element, and a switch power supply. The magnetic core comprises a first magnetic pole, a second magnetic pole, a third magnetic pole and a cross column. The cross column is connected to the same ends of the first magnetic pole, the second magnetic pole and the third magnetic pole. The second magnetic pole is located between the third magnetic pole and the first magnetic pole. The cross section of the first magnetic pole is not equal to the cross section of the third magnetic pole in area along the direction perpendicular to magnetic induction lines. According to the structure of the integrated magnetic element with the above magnetic core, two sets of transformers are formed by a coil wound onto the magnetic core. The active clamp forward-flyback circuit comprises the above-described integrated magnetic element. In this way, the cross-sectional area of the magnetic poles of a forward transformer is smaller than the cross-sectional area of the magnetic poles of a flyback transformer. Therefore, the normal operation of the active clamp forward-flyback circuit is ensured, while the size and the weight of the circuit are reduced.

Description

technical field [0001] The invention relates to the field of electronics, in particular to a magnetic core, an integrated magnetic element, an active clamp forward and flyback circuit and a switching power supply. Background technique [0002] The rapid development of power electronics technology, especially the rapid development of microprocessors, poses a great challenge to the power modules that supply power for them. While applying a variety of technical means to improve the performance of the module power supply, it is increasingly found that magnetic components (referred to as magnetic components, including magnetic cores and coils wound on the magnetic cores) are an important factor that limits the volume, weight, and efficiency of power supplies. . According to the statistics of the American Power Supply Manufacturers Association (PSMA), the volume of magnetic components accounts for more than 20% of the total volume and more than 30% of the total weight in DC-DC (d...

AI Technical Summary

Problems solved by technology

However, this circuit simply builds two transformers for the forward circuit and the flyback circuit on one magnetic component. The volume and weight of the magnetic component are still relatively large, the utilization rate of the magnetic core is not high, and the volume and weight of the magnetic component are relatively large. There is room for further reduction

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