Frequency converter and drive for electric motor

Details Frequency converter and drive for electric motor Frequency converter and drive for electric motor

2005-12-20

2005-12-20

Riley, Shawn (Department: 2838)

Electrical transmission or interconnection systems

Plural supply circuits or sources

Diverse or unlike electrical characteristics

C307S066000

Reexamination Certificate

active

06977449

ABSTRACT:
A charging contactor and charging resistor of a capacitor battery in a prior art intermediate circuit of a frequency converter are replaced with three semiconductor switches connected between a three-phase voltage supply and a capacitor battery. When the frequency converter is connected to a supply network, the three semiconductor switches are arranged to operate at first in a current regulating mode in order to charge the capacitor battery using a regulated charging current until the voltage of the capacitor battery reaches a predetermined level. After this, the three semiconductor switches are directed to operate in a diode bridge mode in parallel with an actual network inverter, thus providing a second rectification branch. In a preferred embodiment of the invention, each semiconductor switch comprises a diode and a series connection of a gate-triggered component, preferably a thyristor.

REFERENCES:
patent: 4160996 (1979-07-01), Nigra et al.
patent: 6101113 (2000-08-01), Paice
patent: 2002/0015320 (2002-02-01), Mochikawa et al.
patent: 2002/0190697 (2002-12-01), Ferens et al.
patent: 19508348 (1996-09-01), None
patent: 19710371 (1998-09-01), None

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