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Compared with single-module applications, unbalanced stray parameters come about frequently in the process of installing paralleled IGBT modules, which could result in some distinctions of current sharing and temperature distributions. To focusing on depicting this practical issue, a novel dynamic electrothermal model extended to paralleled systems is proposed in this paper to establish a comprehensive...
An improved analytical model suitable for IGBT modules is proposed in this paper to calculate the power losses with high accuracy and short calculation time. In this model, the parameters varying with junction temperature of the modules, such as di/dt in the turn-on period and dv/dt in the turn-off period, are discussed and derived according to several equivalent models. In addition, the parasitic...
There are circulating currents among the parallel inverters. Based on the existing researches on circulating currents, an accurate model of switching frequency circulating current is proposed in this paper. Moreover, the relationships between the circuit parameters and switching frequency circulating current are investigated and analyzed in detail. Based on the analytical results, favorable design...
This paper reveals the common-mode (CM) noise coupling path impedance of the transformer for the whole conducted frequency range (150kHz – 30MHz) based on transmission line theory. Lumped circuit model is commonly used to describe the CM noise coupling mechanism through the transformer, but it's only valid below several mega-hertz due to the influence of distribution parasitic parameters. The transmission...
Contactless battery charging platform is an emerging technology that brings safety, reliability and convenience to low-profile charging applications. In this paper, an improved three-layer circular coil array PCB winding is proposed, which can generate the near-uniform magnetic field over a specific operation area. Moreover, an optimal circuit design procedure is developed to maintain the approximately...
Due to the switching operation, the pulse-width modulation (PWM) converters are inherent time-variant systems with comprehensive dynamics. The generalized state-space averaging (GSSA) method is an approach to model them as time-invariant systems, defined by a set of differential equations and capable of representing circuit waveforms. This paper proposes a new generalized state-space averaging model...
Topology selection involved in the design of the inductively coupled power transfer (ICPT) system is presented in this paper. Different compensation topologies of ICPT system are discussed, including single-resonant compensation and multi-resonant compensation topologies. Voltage and current gain are obtained in each case. The concept of power factor in resonant converter is introduced to minimize...
This paper proposed uniform hybrid system models for second-order DC-DC converters working under continuous current mode. Contrast to the averaged and linearized models, no approximation is introduced to the modeling. The direct method of Lyapunov is used to analyze stability of the system and a new sliding mode control strategy is derived from the analysis. Simulation and experiment results are presented...
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