Bi-directional power control system for voltage converter

Electric power conversion systems – Current conversion – With means to introduce or eliminate frequency components

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H02M1/12

Patent

active

059034491

ABSTRACT:
A control system for a voltage converter includes: a power comparator for comparing a power signal on input terminals of the converter with a commanded power signal and producing a power comparison signal; a power regulator for transforming the power comparison signal to a commanded current signal; a current comparator for comparing the commanded current signal with a measured current signal on output terminals of the converter and producing a current comparison signal; a current regulator for transforming the current comparison signal to a pulse width modulator (PWM) duty cycle command signal; and a PWM for using the PWM duty cycle command signal to control electrical switches of the converter. The control system may further include: a command multiplier for converting a voltage signal across the output terminals of the converter to a gain signal having a value between zero (0) and unity (1), and a power multiplier for multiplying the commanded power signal by the gain signal to provide a limited commanded power signal, wherein power comparator compares the limited commanded power signal with the power signal on the input terminals.

REFERENCES:
patent: 3899725 (1975-08-01), Plunkett
patent: 5081409 (1992-01-01), Goff
patent: 5231344 (1993-07-01), Marumoto
patent: 5781423 (1998-07-01), Inarida et al.
"Power Electronics Converters, Applications And Design" By Ned Mohan, et al, Ch. 8, Switch-Mode dc-ac Inverters: DC--Sinusoidal ac, pp. 200-248, 1989.

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