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The impedance modeling of passive device is mandatory for EMI prediction of power converter on printed board circuit (PCB) level. The black-box node-to-node impedance function (NIF) model, which extracts the connecting impedance matrix from measurement, can be used as the most general representation. However, the most recent development of this model is still based on the assumption of ideal shorting...
The traditional one-dimensional (1D) electromechanical impedance model simplifies the PZT as a thin bar, only considering the vibration in the axial direction, and the vibrations in other two directions are neglected. In this study, the vibrations of the PZT patch in x and z directions are taken into account to model the electromechanical coupling interaction between the PZT transducer and the host...
This paper presents the analysis of mixed mode noise in an H-bridge PWM converter. Based on the definition of differential mode (DM) and common mode (CM) noise voltage source and noise current and the time domain voltage and current relationship, noise prediction models are proposed in frequency domain for CM, DM and mixed mode (MM) noise with the consideration of system symmetry regarding the noise...
The shielding effectiveness of a metallic shield perforated with numerous apertures of various shapes is evaluated in this paper. Here an appropriate admittance which takes the mutual coupling between the apertures into account is considered to represent the array of apertures. This method is applicable to an array of square, circular and rectangular holes of rectangle and square configurations. Results...
This paper presents an electro-mechanical impedance (EMI) model for damage identification of thin plate structures. Firstly, a damaged thin plate with a pair of piezoceramic (PZT) transducers bonded on the opposite sides is considered. And the pure bending vibration of the plate actuated by the PZT patches is analyzed. Then, a method which combines the p-Ritz method and the matrix perturbation method...
Piezoelectric lead zirconate titanate (PZT) transducer in the electromechanical impedance (EMI) technique has emerged as a potential sensing tool for structural health monitoring. In the EMI technique, PZT acts as both sensor and actuator simultaneously due to its direct and inverse piezoelectric effects. The EMI method using PZT transducers provide a new way for in-situ nondestructive testing of...
Instead of just transforming energy, a modern power converter should incorporate enhanced features to adapt its behavior to its environment. Stability issues in 3-phase power systems with PFC rectifiers incorporating input filters have been a problem for a long time. In this paper a new concept is presented as to how the power converter can shift filter resonances into an unproblematic frequency range...
Nodal admittance equation is derived based on chain parameter matrix for multiconductor transmission lines excited by distributed source. This method can be simply used in analysis of complex network excited by distributed source. Based on this method conduction immunity of shielded cable was analyzed, and it is verified by comparison with the reference. In the conclusion of this paper the authors...
This paper focuses on the delamination detection in composite beams using electro-mechanical impedance (EMI) signatures, which is directly related to the structure's mechanical impedance. A model of a laminated beam including a delamination as well as installed PZT transducers is presented. Furthermore, the model has to take into account the dynamic behavior of the piezoelectric patches and simulate...
The paper investigates the effects of EMI filter in the dynamics of a buck converter. It is shown theoretically that the EMI filter may increase significantly the load sensitivity of the voltage-mode-controlled converter but the peak-current-mode-controlled converter is quite insensitive to the EMI filter interactions. Experimental validations are carried out using a buck converter under three different...
This paper presents the numerical simulation of the transfer characteristics of a coaxial cable using the transmission line matrix (TLM) method. The geometry of a braided shield is examined and the coupling across the braided shield is incorporated into the numerical model. The main advantage of the proposed method is that it can simulate the effect of the length of the cable and electromagnetic interference...
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