Synthesis of Input-Rectifierless AC/DC Converters

IEEE Trans. Power Electron.

et al. 2006

Abstract-This paper presents an ac-dc converter topology for realization of power factor correction (PFC) voltage regulators for applications where the mains frequency is high and a low input current harmonic is required, e.g., in aircraft power systems. The proposed converter represents a minimal configuration consisting of two basic converters, which can be systematically derived from a previously proposed general synthesis procedure for rectifierless ac-dc converters. The proposed PFC converter has incorporated a control method which drastically reduces the circulating power and hence raises the efficiency to a level comparable to existing PFC converters. The proposed PFC converter can completely eliminate any crossover distortion, which can be significant for supply systems having a high mains frequency. In addition, the proposed converter allows bidirectional energy flow ensuring all inductors work in continuous conduction mode hence eliminating the distortion due to the abrupt change of dynamic response when the operating mode changes. Analysis and design of the power and control circuits will be given and discussed. An experimental system will be presented for verification purposes.

Section: A Reduction Of Circulating Powermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A PFC voltage regulator with low input current distortion derived from a rectifierless topology

Liu

IEEE Trans. Power Electron.

et al. 2006

“…Some suitable circuit configurations satisfying the above conditions can be found in Liu et al [4], which describes a family of two-converter configurations for achieving two control functions. A minimal configuration is shown in Fig.…”

Section: Methodsmentioning

confidence: 99%

Synthesis of Impedance Using Switching Converters

Liu¹,

2005 IEEE International Conference on Industrial Technology

et al.

Self Cite

A general impedance synthesizer using a minimum number of switching converters is studied in this paper. We begin with showing that any impedance can be synthesized by a circuit consisting of only two simple power converters, one storage element (e.g., capacitor), and one dissipative element (e.g., resistor) or power source. The implementation of such a circuit for synthesizing any desired impedance can be performed by (i) programming the input current given the input voltage such that the desired impedance function is achieved; (ii) controlling the amount of power dissipation (generation) in the dissipative element (source) so as to match the required active power of the impedance to be synthesized. Then, the instantaneous power will automatically be balanced by the storage element. Such impedance synthesizers find a lot of applications in power electronics. For instance, a resistance synthesizer can be used for power factor correction (PFC), a programmable capacitor or inductor synthesizer (comprising of small high-frequency converters) can be used for control applications.

“…Clearly, no impedance can be synthesized with one converter terminated with a fixed load impedance because (2) can never be satisfied. 4 Thus, one switching converter is insufficient. Clearly, we need to balance the power by ensuring that the output of the converter "emits" the right amount of instantaneous power.…”

Section: Minimal Configuration Of Impedance Synthesizer Based On Switmentioning

confidence: 99%

General impedance synthesizer using minimal configuration of switching converters

Liu

Proceedings of the 2005 European Conference on Circuit Theory and Design, 2005.

et al.

Self Cite

-A general impedance synthesizer using a minimum number of switching converters is studied in this paper. We begin with showing that any impedance can be synthesized by a circuit consisting of only two simple power converters, one storage element (e.g., capacitor), and one dissipative element (e.g., resistor) or power source. The implementation of such a circuit for synthesizing any desired impedance can be performed by (i) programming the input current given the input voltage such that the desired impedance function is achieved; (ii) controlling the amount of power dissipation (generation) in the dissipative element (source) so as to match the required active power of the impedance to be synthesized. Then, the instantaneous power will automatically be balanced by the storage element. Such impedance synthesizers find a lot of applications in power electronics. For instance, a resistance synthesizer can be used for power factor correction (PFC), a programmable capacitor or inductor synthesizer (comprising of small high-frequency converters) can be used for control applications.