A Discussion on PFC Circuit Using Ladder Type Filter

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  • ラダー形フィルタを用いたPFC回路の検討
  • ラダー形フィルタを用いたPFC回路の特性
  • ラダーガタ フィルタ オ モチイタ PFC カイロ ノ トクセイ

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Abstract

For various rectifier circuits such as those for consumer electronics and appliances, rectifier circuits of the capacitor input type are generally used. It is known that such rectifier generates various harmonics in the power system. To improve those harmonic problems, various PFC circuits have been proposed so far. Among these, Takahashi have proposed a PFC scheme using a LC filter without switching devices. This method makes a PFC effect by widening conduction period using the operations of capacitors and inductor. On the basis of this scheme, we propose another PFC circuit. This method attempts to improve the input current, towards satisfactory waveform by using a novel ladder type filter, whose operating mechanism is analogous to Takahashi's, but an original one. Various fundamental operations are discussed and these are confirmed by computer simulation, and experiment. Compared with the conventional circuits, the construction is a little simple, so could be expected to be easily developed to the three phase circuit.

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