Non-linear carrier controllers for high power factor rectificati

Details Non-linear carrier controllers for high power factor rectificati Non-linear carrier controllers for high power factor rectificati

1995-01-12

1999-02-02

Wong, Peter S.

Electric power conversion systems

Current conversion

With condition responsive means to control the output...

323222, G05F 146, H02P 1300

Patent

active

058673792

ABSTRACT:
This patent disclosure describes new non-linear carrier-pulse-width modulators for control of high power-factor boost rectifiers. In the new modulators, the switch duty ratio is determined by comparing a signal derived from the main switch current with a periodic, nonlinear carrier signal .nu..sub.c (t, .nu..sub.m). The shape of the carrier is selected so that the resulting input current follows the input voltage, as required for unity-power-factor rectification. A slowly-varying modulating input .nu..sub.m can be used to adjust the power level and to regulate the output dc voltage. The controller based on the new non-linear-carrier modulator has a number of advantageous properties: sensing of the input line voltage is eliminated; for current shaping, only sensing of the power switch current is needed; current shaping does not require an error amplifier with feedback loop compensation; the multiplier in the voltage feedback loop is eliminated; and the converter operates in the continuous conduction mode. The controller is potentially well-suited for integrated-circuit implementation. It can be expected that a dedicated IC based on the feed-forward modulators disclosed here would be simpler and would require less i/o pins than ICs currently available for power-factor correction, while offering comparable or improved performance.

REFERENCES:
patent: 3659184 (1972-04-01), Schwarz
patent: 4974141 (1990-11-01), Severinsky et al.
patent: 4985821 (1991-01-01), Cohen
patent: 5001620 (1991-03-01), Smith
patent: 5003454 (1991-03-01), Bruning
patent: 5291382 (1994-03-01), Cohen
1993 IEEE 0-7803-0982, to Tang et al. "Power Factor Correction With Flyback Converter Employing Charge Control".
Cherry Semi-Conductor-Application "Control IC For Near Unity Power Factor in SMPS".
Oct. 1989 Power Conversion Proceedings "Design of a 1KW Power Factor Correction Circuit".
May 1994 IEEE 0-7803-1456, Bazinat and O'Connor paper "Analysis And Design of a Zero Voltage Transitions Power Factor Correction Circuit".

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