Single-phase interpolar inductance interleaving power factor correction circuit

Abstract

The invention relates to a single-phase interpolar inductance interleaving power factor correction circuit. The single-phase interpolar inductance interleaving power factor correction circuit comprises a rectification circuit, a main inductor, a first boost branch circuit, a second boost branch circuit and an output capacitor, wherein the rectification circuit is connected with an input power supply, the other end of the output capacitor, a loop end of the first boost branch circuit and a loop end of the second boost branch circuit are connected with the other output end of the rectification circuit, the first boost branch circuit and the second boost branch circuit are connected in parallel, the first boost branch circuit comprises a first inductor, the second boost branch circuit comprises a second inductor, and the first inductor and the second inductor form a reverse coupling transformer. With the adoption of a coupling transformer mode, current sharing of the two branches can be achieved, so that the problem of no current sharing of the two Boost circuits directly connected in parallel is solved, the thermal stresses of the two parallel paths of power devices are same, and theequipment stability is improved.

Description

technical field [0001] The invention relates to the field of electric power transmission, in particular to a single-phase interpolar inductance interleaved parallel connection power factor correction circuit. Background technique [0002] With the development of power electronics, the power grid has higher and higher harmonic requirements for power electronic equipment, and power factor correction circuits are widely used. In the traditional single-phase small and medium power occasions, a single Boost circuit (boost circuit) is directly used to achieve power factor correction, such as figure 1 shown. By controlling the switch tube S 1 The drive pulse to achieve power factor correction. [0003] exist figure 1 The power factor correction scheme for a single switching tube is only suitable for small and medium power levels. With the continuous improvement of the power level of current electrical equipment, the current stress of a single switching tube is too large, the ri...

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Problems solved by technology

[0003] exist figure 1 The power factor correction scheme for a single switching tube is only suitable for small and medium power levels. With the continuous improvement of the power level of current electrical equipment, the current stress of a single switching tube is too large, the ripple of the inductor current is large, and the design of magnetic components is difficult. , the heat dissipation design is difficult, the efficiency is low, and the current harmonic content is high, etc.

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