Polyphase full-wave rectifying circuit

Details Polyphase full-wave rectifying circuit Polyphase full-wave rectifying circuit

1989-11-09

1991-01-01

Wong, Peter S.

Electric power conversion systems

Current conversion

Including automatic or integral protection means

363126, 323231, 361 21, H02M 706, H02H 7125

Patent

active

049823167

ABSTRACT:
A polyphase full-wave rectifying circuit that is connected to a polyphase AC line having a neutral point includes DC output terminals and plural pairs of rectifying elements. Each pair is composed of two rectifying elements in series and these pairs are connected in parallel with each other between the DC output terminals. One of the pairs of rectifying elements is a pair of Zener type rectifying elements and the interconnection point of this pair is to the neutral point of the polyphase AC line. The other pairs are pairs of ordinary type rectifying elements, each interconnection point of these pairs is to each phase point of the polyphase AC line. Both internal surges and external surges are absorbed through the pair of Zener type elements. Therefore, the clamping voltages of the internal and external surges results in the same level, being twice as high as the Zener voltage. The peak voltage applied to one Zener type element reduces by half the surge peak voltage.

REFERENCES:
patent: 3551781 (1970-12-01), Smith
patent: 3911324 (1975-10-01), Bishop
patent: 4347543 (1982-08-01), Frister et al.
patent: 4808866 (1989-02-01), Kawazoe et al.

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