Combined current transformer capable of realizing emergency regulation of output by series connection of high frequency AC sides

Abstract

The invention relates to an isolated Dc / Dc electric energy transducer, and aims to provide a combined current transformer capable of realizing the emergency regulation of output by the series connection of high frequency AC sides. The combined current transformer comprises two transformers, wherein primary windings of the two transformers are connected in series and then connected to the two ends of an AC input source Vin; the output of a secondary winding of the transformer T1 is connected to the input end of a rectifier circuit Rec1; the output of the secondary winding of the transformer T2 is connected to the input end of the rectifier circuit Rec2; one end of the output of the rectifier circuit Rec1 is connected to the positive end of an output capacitor Co, and the other end of the output of the rectifier circuit Rec1 is connected to the negative end of output Vo; one end of a load RL is connected to the positive end of the output capacitor Co, and the other end of the load RL is connected to the negative end of the output Vo; and the output of the rectifier circuit Rec2 adopts two alternative ways. The primary side of the combined current transformer can realize a fixed duty ratio, so the utilization rate of the transformers T1 and T2 are maximized; a feedback control signal is not required to be transmitted to the primary side, so the reliability of feedback control is improved; the modularization of a plurality of paths of independent output can be easy to realize; and the rectifier circuits of a secondary side more easily adopt a synchronous rectification technology.

Description

technical field [0001] The invention relates to an isolated Dc / Dc electric energy converter, in particular to a combined converter in which the high-frequency AC side is connected in series to realize tightly regulated output. Background technique [0002] Many power conversion applications require electrical isolation between the input and output, and tight adjustment of the output voltage to ensure that the output voltage remains constant when the load is disturbed or the input voltage changes. In order to achieve tight adjustment of the output, a DC / Dc converter with high-frequency transformer isolation is generally used, such as figure 1 As shown, the output voltage can be kept constant by adjusting the duty ratio of the primary switching tube or the switching frequency. Although such a solution is simple, the efficiency is low, especially the working duty cycle of the transformer will also change with the duty cycle adjustment of the circuit, resulting in a decrease in...

AI Technical Summary

Problems solved by technology

With such a structure, although the front stage is used as DCX, it can be regarded as an equivalent DC transformer to optimize efficiency, but all input power needs to be converted in two stages, and the efficiency is reduced

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