Harmonic-injection control technique for three-phase, discontinu

Details Harmonic-injection control technique for three-phase, discontinu Harmonic-injection control technique for three-phase, discontinu

1999-02-11

2000-04-11

Nguyen, Matthew

Electric power conversion systems

Current conversion

With condition responsive means to control the output...

363 44, H02M 542

Patent

active

060494735

ABSTRACT:
A three-phase discontinuous-conduction-mode (DCM), pulse-width-modulated (PWM) boost rectifier using harmonic-injection control is provided with a feedforward path to vary the duty cycle of the PWM modulator according to the input voltage, so as to provide improved transient response. In one embodiment, the feedforward path provides to the PWM modulator a ramp voltage that has a slope proportional to the magnitude of the input line voltage. In one embodiment, the harmonic injection signal is summed with the error signal of an output feedback loop. In another embodiment, the harmonic injection signal is integrated and summed with the ramp voltage of the feedforward path. Moreover, by adding a nonlinear gain control circuit, the DC gain of the DCM boost rectifier at light load is adaptively reduced to achieve stability of the rectifier at light load.

REFERENCES:
patent: 4940929 (1990-07-01), Williams
patent: 5568041 (1996-10-01), Hesterman
patent: 5847944 (1998-12-01), Jang et al.
patent: 5867379 (1999-02-01), Maksimovic et al.
"Feed-Forward Pulse-Width Modulators For Switching Power Converters", Barry Arbetter, Dragan Maksimovic, IEEE, Jun. 1995, pp. 601-607.
"Optimal Feed-Forward Compensation for PWM DC/DC Converters with `Linear` and `Quadratic` Conversion Ratio", Luigi Calderone, etc., IEEE, Apr. 1992, pp. 349-355.

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