Phase-on ride-through control circuit

Details Phase-on ride-through control circuit Phase-on ride-through control circuit

1982-02-16

1984-07-10

Shoop, William M.

Electric power conversion systems

Current conversion

Having plural converters for single conversion

363101, H02M 700

Patent

active

044596529

ABSTRACT:
A D.C. power supply (10, 44) having an auxiliary bridge rectifier (14, 38, 48) connected in series with a primary bridge rectifier (12, 46) is disclosed. The auxiliary bridge rectifier (14, 38, 48) "floats" above the potential of the primary bridge rectifier (12, 46) furnishing additional voltage at the D.C. power supply output (20, 22; 56, 58) whenever the A.C. mains voltage input to the main bridge rectifier (12, 46) drops below a predetermined value. In one embodiment of the present invention, a series of SCR's (26, 28) arranged in three-phase configuration perform the rectification and regulation functions of the primary bridge rectifier (12, 46) and the auxiliary bridge rectifier (14, 48). In an alternate embodiment of the present invention, paired SCR's (40) and diodes (42) are arranged in a half-controlled auxiliary bridge rectifier configuration (38). Individual firing angles for the various SCR's (26, 28, 40) are computed as a composite of several factors, including a firing delay factor .alpha..sub.o, a load current correction factor .DELTA..alpha. and a phase shift compensation factor .delta..alpha.. Each of the several factors employed in calculating individual firing angles can be ascertained in accordance with the desired D.C. voltage output of the D.C. power supply (10, 44).

REFERENCES:
patent: 2834931 (1958-05-01), Walker
patent: 4020411 (1977-04-01), Tsuboi et al.
patent: 4315208 (1982-02-01), McElroy et al.

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