Active clamped topology circuit of multi transformer

Abstract

The invention relates to a multi-transformer active clamp topology circuit, which includes at least one transformer group, and each transformer group contains two transformers; the primary sides of all transformers are connected in series to lead to two input lines, and one of the input lines There is a main switch S1 in series; the first ends of all transformer secondary sides are directly connected in parallel to lead out the first output line; in different transformer groups, the second end of the first transformer secondary side is directly connected in parallel to lead out the first parallel line, and the second transformer The second terminal of the secondary side is directly connected in parallel to lead out the second parallel line, the first parallel line passes through the switch S3, the second parallel line passes through the switch S4, and then leads to the second output line in parallel with each other; each transformer works in the forward mode; it also includes a clamp bit circuit. The clamping circuit includes a switch S2 and a capacitor C1, which can be connected by primary side clamping or secondary side clamping. The circuit of the invention is easy to design, does not need inductance, takes up little space, requires few devices, is easy to lay out boards, has high conversion efficiency and is good for heat dissipation.

Description

technical field [0001] The invention relates to the field of switching power supplies, and more specifically relates to a multi-transformer active clamp topology circuit suitable for low-voltage and high-current DC / DC converters. Background technique [0002] As the size of modern VLSI continues to decrease and the speed continues to increase, there are higher requirements for the power supply of integrated circuits in terms of volume miniaturization and high power density. The so-called distributed power system (Distributed Power System, DPS) will be widely used in computer and communication systems. In a distributed power system, energy is distributed to the load terminal through high-voltage (such as 48V) and small-current bus transmission, and then converted into a low voltage (such as 3.3V or lower) by one or more stages of DC / DC converter to directly supply the load. . At present, the conversion efficiency of the DC / DC converter is required to be as high as possible,...

AI Technical Summary

Problems solved by technology

[0010] The technical problem to be solved by the present invention is to provide an effective multi-transformer for low-voltage and high-current DC / DC modules in view of the above-mentioned defects in the prior art that the above-mentioned low-voltage output will cause the transformation ratio of the transformer to be large and the efficiency of high-current output to be reduced. Source Clamp Topology

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