Modulator for resonant link converters

Details Modulator for resonant link converters Modulator for resonant link converters

1995-06-16

1997-04-08

Wong, Peter S.

Electric power conversion systems

Current conversion

With condition responsive means to control the output...

363 41, H02M 112, H02M 114, H02M 324, H02M 542

Patent

active

056194064

ABSTRACT:
A modulator for resonant DC link and other power converters is provided having superior performance and general applicability to multi-phase converters. The modulator includes three major components: (1) a multi-input, multi-output linear system, (2) a quantizer, and (3) a latch. The linear system receives multiple reference signal waveforms and multiple feedback signal waveforms representative of the modulator output as input signals and produces multiple linear output signals derived from the difference between the reference and feedback waveforms as outputs. The linear system is preferably a second order system. The quantizer assigns the continuous output of the linear system to one of a finite set of discrete output vectors. The output of the quantizer is latched at a sampling rate synchronized with the times of zero voltage or current on the DC bus of the converter. The latched outputs are used as both control signals, to control the inverter output switching devices, and to derive the feedback waveform signals provided to the linear system. The modulator may be provided as part of a resonant DC link inverter or as part of a control system for such an inverter.

REFERENCES:
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T.G. Habetler & D.M. Divan, "Performance Characterization of a New Discrete Pulse Modulated Current Regulator", 1988 IEEE IAS Ann. Meeting, pp. 395-405.
G. Venkataramanan, et al., "Discrete Pulse Modulation Strategies for High-Frequency Inverter Systems", 20th Ann. IEEE PESC, pp. 1013-1020, 1989.
G. Venkataramanan & D. Divan, "Pulse Width Modulation with Resonant DC Link Converters", 1990 IEEE IAS Ann. Meeting, pp. 984-990.
Jin-Woo Lee, et al., "A New Quasi-Resonant DC Link Inverter", EPE Firenze, vol. 4, pp. 202-206, 1991.

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