Elevator rescue apparatus during stoppage of power supply

Details Elevator rescue apparatus during stoppage of power supply Elevator rescue apparatus during stoppage of power supply

1986-03-11

1987-02-10

Miska, Vit W.

Electrical transmission or interconnection systems

Plural supply circuits or sources

Substitute or emergency source

187114, H02J 904, B66B 502

Patent

active

046424741

ABSTRACT:
Series circuits consisting of diodes for blocking reverse currents are inserted between the upper and lower arms of bridge-connected transistors constituting an inverter, and contacts of a contactor adapted to close upon a stoppage of power supply are respectively connected in parallel with the series circuits so as to short-circuit the series circuits of the diodes, whereby the inverter is changed-over from a current type inverter to a voltage type inverter upon the stoppage of the power supply. Thus, even in an elevator employing the current type inverter, a rescue operation during the stoppage of the power supply can be performed with a simple circuit arrangement employing a D.C. power source.

REFERENCES:
patent: 4209082 (1980-06-01), Anlai et al.
patent: 4316097 (1982-02-01), Reynolds
patent: 4376471 (1983-03-01), Uchino et al.
patent: 4484664 (1984-11-01), Nomura
patent: 4519479 (1985-05-01), Tanahasik
patent: 4566766 (1985-03-01), Watanabe

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