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In this paper multiple feedback(FB) active filter configurations for DM EMI noise in the input side of AC/DC converters has been analyzed using developed models and then their performance was compared over single FB active filters using measurements. First, a single FB active filter circuit model is developed in the open loop and then based on DM EMI noise model of AC/DC converters, a closed loop...
EMI noise could bring electromechanical damages to the motors as well as reduce the stability of AC traction system. Since the high frequency noises propagate paths are quite complicated compared with fundamental frequency components, the high frequency EMI noise coupled through system's parasitic parameters is difficult to analyze and eliminated. In this paper, a common-mode equivalent circuit as...
Although existing standards such as IEC62684 and EN 301 489-34 limit the line frequency common mode (CM) voltages at the output of AC/DC converters, the mechanism and characteristics of line frequency CM voltages at the outputs of AC/DC converters are unclear and the technique to reduce it is not well investigated and developed. In this paper, the line frequency CM voltages at the outputs of AC/DC...
With the PWM techniques widely applied in motor drive systems, the impact of the electromagnetic interference (EMI) in adjustable speed drive (ASD) system cannot be ignored. EMI noise in motor drive systems could bring electromechanical damages to the motors as well as reduce the stability of the ASD system. Since the high frequency noises propagate paths are quite complicated compared with fundamental...
The common mode (CM) noise of power adapters tends to interfere the performance of touchscreens of consumer electronics. However, there's a lack of literature illustrating and modeling the mechanism. This paper investigates the CM noise source impedances of the AD/DC adapters and the characteristics of touchscreens. Based on this understanding, the relationship of CM voltage of an adapter and the...
This paper focuses on the model analysis and parameter adjustment procedure of the 4-coil wireless charging system (WCS). Different models for the 4-coil WCS, distinguished by considering the nonadjacent-coil influence or not, are analyzed respectively. The LLC and CLC “T” compensation networks that are developed from the additional two coils in the 4-coil WCS are firstly proposed. An equivalent circuit...
This paper developed models for DM electromagnetic interference (EMI) input filters in AC-DC converters. The models are developed based on the circuit structures and control configurations. The models are developed for feedback, feedforward, feedforward-feedback and feedback-feedforward configurations. The closed loop gains are derived respectively. Based on the closed loop gain models, the open loop...
A systematic behavior model based on time domain simulation to predict the EMI performance is analyzed. Optimization algorithm is used to improve the accuracy of modeling the impedance of the conduction path. Instead of a simple trapezoid wave, IGBTs and diodes' switching characteristics and their parasitic components are used to model the half bridge integrated power module (IPM). The comparison...
Based on coupled-mode theory and circuit theory, this paper presents theoretical analysis of the power transfer efficiency for the 4-coil wireless power transfer system presented by scholars in Massachusetts Institute of Technology. The theoretical analysis results indicate that the coupled-mode theory and circuit theory can lead to the exact same set of formulas and optimal solutions in the power...
This paper first analyzes the current paths on a planar busbar based on IGBT bridge switching states and DC-link capacitor configurations. The busbar's circuit models which include both self and mutual inductances are developed based on the identified current paths. The inductance circuit models are analyzed and reduced for different switching states, transition states and DC-link capacitor configurations...
This paper has investigated present radiation hardened FPGA manufacturers and SEU hardened method of configurable SRAM (CSRAM) applied to FPGA. A novel high-density single-event upset hardened CSRAM applied to BQV 300 FPGA is proposed, and this paper uses the mix-mode radiation hardened verification method to simulate the SEU hardened CSRAM. The proposed SEU-hardened CSRAM applied to FPGAs is SEU...
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