Power conditioning system for use with two PWM inverters and at

Details Power conditioning system for use with two PWM inverters and at Power conditioning system for use with two PWM inverters and at

1991-05-16

1992-08-25

Stephan, Steven L.

Electric power conversion systems

Current conversion

Having plural converters for single conversion

307 14, 307 17, 307 31, 307 82, 89 281, 42 84, H02M 700, H02J 300

Patent

active

051424681

ABSTRACT:
A coupling circuit (30) connects two three-phase pulse width modulated (PWM) inverter circuits (16, 18), used in conventional manner to power a first load (12), in order to independently power a second load (32). In a preferred embodiment, the two PWM inverter circuits propel an armored vehicle, such as a tank, with one motor driving the right side, and the other motor driving the left side. The propulsion of the vehicle represents the first load. The second load is a pulse forming network (PFN), which PFN powers an electrothermal gun system carried by the vehicle. The coupling circuit includes a transformer (TA, TB, TC) and rectifier circuit (34) for each phase output of the PWM inverters. A primary winding (32) of each transformer is connected between corresponding phase outputs of the two PWM inverters. A secondary winding of each transformer is connected to a respective rectifier circuit. The output of each rectifier circuit is joined with the other rectifier outputs to charge the PFN. Charging of the PFN is controlled using a phase shift network (28) that selectively adjusts the phase shift between the carrier signals applied to the two PWM inverters, with a zero phase shift reducing the charging current to zero, and a 180.degree. phase shift increasing the charging current to a maximum. A feedback sensor (38) detects the current, voltage and/or power of the PFN output, and these sensed parameters in turn control the phase shift between the two carrier signals so as to produce and/or maintain a specified PFN charging current.

REFERENCES:
patent: 4238688 (1980-12-01), Boettcher, Jr. et al.
patent: 4349772 (1982-09-01), Weiss
patent: 4677535 (1987-06-01), Kawabata et al.
patent: 4736286 (1988-04-01), Gulczynski
patent: 4802079 (1989-01-01), Mizoguchi
patent: 4825144 (1989-04-01), Alberkrack et al.
Patel, et al., "Generalized Techniques of Harmonic Elimination and Voltage Control in Thyristor Inverters: Part 1-Harmonic Elimination", IEEE Trans. on Industry Appls., pp. 310-317 (May/Jun. 1973).
Weichmann et al., "Generalized Functional Model for Three-Phase PWM Inverter/Rectifier Converters", IEEE Trans. on Industry Appls., pp. 236-246 (Mar./Apr. 1987).

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