Showing papers by "Min Chen published in 2004"
27 Sep 2004
TL;DR: In this article, the authors developed a systematic analytical method to calculate the harmonic components of uncontrolled single and three phase rectifiers based on frequency domain linearity (A.R. Wood and J. Arrillaga, 1995), where dc side voltage and current of discontinuous rectifiers are divided into on and off period segments, then through superposition, the analysis is greatly simplified.
Abstract: This paper develops a systematic analytical method to calculate the harmonic components of uncontrolled single and three phase rectifiers. Based on frequency domain linearity (A.R. Wood and J. Arrillaga, 1995), the dc side voltage and current of discontinuous rectifiers are divided into on and off period segments, then through superposition, the analysis is greatly simplified. Similarly, the effects of the commutation and firing angle shift of continuous three phase rectifiers can be analyzed separately. Based on these analyses, simple expressions of the switching angle of discontinuous mode rectifier and the overlap period and firing angle shift of continuous three-phase rectifiers are obtained. All the calculations are purely algebraic, with high accuracy. The simulation results validated the proposed method.
24 citations
27 Sep 2004
TL;DR: In this article, the authors presented a novel method to supply the power of Maglev when it is running in lower speed by adding a high frequency current to the original current of the long stator of linear drive motor.
Abstract: This paper presents a novel method to supply the power of Maglev when it is running in lower speed. It is realized by adding a high frequency current to the original current of the long stator of linear drive motor. Output voltage model of linear generator is given. Relationship between the linear generator output voltage and the injection harmonic current is derived. Finally, experimental results are given.
16 citations
TL;DR: In this article, a zero voltage switching (ZVS) dual bridge dc/dc converter is presented, which is composed of two dual-transistor-forward converter, coupled with a single high frequency transformer.
Abstract: A novel zero voltage switching (ZVS) dual bridge dc/dc converter is presented. The proposed converter is composed of two dual-transistor-forward converter, coupled with a single high frequency transformer. ZVS is realized by introducing a proper leakage inductance to the secondary of the high frequency isolation transformer with a corporation of a designed pulse-width modulation control. Operation principle and ZVS condition of the proposed converter are analyzed. Experimental results obtained from a 3.2-kW prototype are given. Extensions of the proposed converter topologies and experimental results of one extension converter are presented.
9 citations
06 Jun 2004
TL;DR: In this paper, two methods of implementing dual-band transmitters using re-configurable circuits operating in conjunction with digital predistortion linearizers are investigated, one of which utilizes a circuit topology that can be switched between a fundamental-mode in-phase combined amplifier, and a push-push frequency doubler.
Abstract: Two methods of implementing dual-band transmitters using re-configurable circuits operating in conjunction with digital predistortion linearizers are investigated. One method utilizes a circuit topology that can be switched between a fundamental-mode in-phase combined amplifier, and a push-push frequency doubler. Measurement results indicated that the circuit was able to amplify IS-95 B CDMA signals in either the 881 MHz, or the 1763 MHz band with an adjacent-channel power ratio (ACPR) of -48 dBc/30 kHz. Another method that was investigated utilizes fundamental-frequency power amplifier followed by a varactor multiplier that can be bypassed. A varactor-diode doubler with a conversion loss of 3.3 dB was built and tested. An ACPR of -53 dBc/30 kHz at 885 kHz offset was achieved for a CDMA signal transmitted at 1892 MHz.
4 citations
Proceedings Article•
01 Jan 2004TL;DR: In this article, a ZVS three level two transistor forward DC/DC converter (input 600 V, output 48 V/50 A) is proposed, and the performance of a 600 V/10 A silicon carbide Schottky diode (Cree CDS10060) is experimentally evaluated on the prototype.
Abstract: A ZVS three level two transistor forward DC/DC converter (input 600 V, output 48 V/50 A) is proposed. The performance of a 600 V/10 A silicon carbide (SiC) Schottky diode (Cree CDS10060) is experimentally evaluated on the prototype. Reverse recovery and overall efficiency are compared between the SiC diode and fast soft-recovery silicon power diode