Silicon controlled rectifier polyphase bridge inverter commutate

Details Silicon controlled rectifier polyphase bridge inverter commutate Silicon controlled rectifier polyphase bridge inverter commutate

1982-12-07

1986-02-11

Wong, Peter S.

Electric power conversion systems

Current conversion

Using semiconductor-type converter

363 58, 361100, H02M 7515, H02H 7122

Patent

active

045702128

ABSTRACT:
A polyphase SCR inverter (10) having N switching poles, each comprised of two SCR switches (1A, 1B; 2A, 2B . . . NA, NB) and two diodes (D1B; D1B; D2A, D2B . . . DNA, DNB) in series opposition with saturable reactors (L1A, L1B; L2A, L2B . . . LNA, LNB) connecting the junctions between the SCR switches and diodes to an output terminal (1, 2 . . . 3) is commutated with only one GTO thyristor (16) connected between the common negative terminal of a dc source and a tap of a series inductor (14) connected to the positive terminal of the dc source. A clamp winding (22) and diode (24) are provided, as is a snubber (18) which may have its capacitance (c) sized for maximum load current divided into a plurality of capacitors (C.sub.1, C.sub.2 . . . C.sub.N), each in series with an SCR switch S.sub.1, S.sub.2 . . . S.sub.N). The total capacitance may be selected by activating selected switches as a function of load current. A resistor 28 and SCR switch 26 shunt reverse current when the load acts as a generator, such as a motor while braking.

REFERENCES:
patent: 3588667 (1971-06-01), Duff et al.
patent: 3916287 (1975-10-01), Brenneisen et al.
patent: 4214196 (1980-07-01), Boyce
patent: 4231083 (1982-10-01), Matsuda et al.
patent: 4319318 (1982-03-01), Rippel
German Publication "Electrische Bahnen, 77, (1979), H. 11, by Bohm & Kruger, pp. 306-312.
Meiden Review (Eng. Ed.) Japan Ser. No. 61, No. 1, (1981).
SCR Manual, Fifth Ed., General Electric (1977).

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