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- Hengchun Mao, Fred C. Lee, Dushan Boroyevich, Silva Hiti
- IEEE Trans. Industrial Electronics
- 1997

This paper reviews recent progress in topology, control, and design aspects in three-phase power-factor correction (PFC) techniques. Different switching rectifier topologies are presented for various applications. Representative soft-switching schemes, including zero-voltage and zero-current switched pulsewidth modulated (PWM) techniques, are investigated.… (More)

- Giorgio Spiazzi, Fred C. Lee
- IEEE Trans. Industrial Electronics
- 1997

This paper describes the effect of interleaved discontinuous space-vector modulation (SVM) in paralleled threephase systems using three-phase pulsewidth modulation (PWM) rectifiers as an example. At the discontinuous point of the SVM, the phase shift between the switching signals of the paralleled modules generates a zero-sequence excitation to the system.… (More)

- K. Yao, Yu Meng, Fred C. Lee
- 2001

This paper discusses the transient response of voltage regulator modules (VRMs) based on the small-signal models. The concept of constant resistive output impedance design for the VRM is proposed, and its limitations in applications are analyzed. The impacts of the output filter and the feedback control bandwidth show that there is an optimal design that… (More)

One unique feature in parallel three-phase converters is a potential zero-sequence circulating current. To avoid the circulating current, most present technology uses isolation approach, such as transformers or separate power supplies. This paper proposes a parallel system where individual converters connect both ac and dc sides directly without additional… (More)

- Guichao Hua, Fred C. Lee
- IEEE Trans. Industrial Electronics
- 1995

- Jian Li, Fred C. Lee
- IEEE Trans. on Circuits and Systems
- 2010

Recently, the V type of constant on-time control has been widely used to improve light-load efficiency. In V implementation, the nonlinear PWM modulator is much more complicated than usual, since not only is the inductor current information fed back to the modulator, but the capacitor voltage ripple information is also fed back to the modulator. Generally… (More)

(ABSTRACT) In order to meet demands for faster and more efficient data processing, modern microprocessors are being designed with lower voltage implementations. The processor voltage supply in future generation processors will decrease to 1.1 V ~ 1.8V. More devices will be packed on a single processor chip, and processors will operate at higher frequencies,… (More)

This paper presents the analysis and evaluation of the input current in the critical mode single-phase boost power-factor-correction (PFC) converter. First, the switching-frequency ripple of the input current is derived and the differential-mode EM1 filters of the critical and continuous mode PFC rectifiers are calculated and compared. Next, the benefits… (More)