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A lumped-element model of a 72-nH surface-mount power inductor used in high-frequency DC-DC converters is presented. The model parameters are optimized to fit the measured impedance characteristics. Two different topologies of the characterization set-up are used: the first one to extract the model and the second to validate its impedance characteristics up to 300 MHz. The extracted model demonstrates...
Multi-physics modeling in power electronics contains EMC studies, thus conception requires modeling of passive elements. These models need to be compatible with the simulation software usually used in the industry. An analysis for modeling an inductor at high-frequency is presented in this study. The method takes into account the proper inductances of the turns, the mutual inductances between them,...
This paper proposes a fast adaptive photovoltaic (PV) dc boost converter cascaded control scheme insensitive to solar irradiance variations. Moreover, the proposed controller makes possible the utilization of film capacitors instead of electrolytic capacitors to achieve long converter's lifetime. To achieve these objectives, it is proposed a current controller that works in both discontinuous conduction...
In this paper realization of digital LCR meter is presented. Realized system is based on integrated circuit AD5933 which is controlled by microcontroller ATmega128. Device can calculate resistance, capacitance and inductance of the device under test as well as Dissipation and Quality factors. Operating frequency range is from 5 to 100 kHz with frequency sweep function in maximum 511 steps. Device...
Magnetic materials made of iron-powder that are used for the cores of the chokes of voltage source inverters output filters significantly change their power losses and magnetic properties with the frequency and the amplitude of the choke current in the range that is important for designers. This causes the magnitude Bode plot of the VSI control transfer function to have a higher damping coefficient...
The paper describes a special method for testing power capacitors by means of their loading by alternating current with the effective value up to 100 A at frequencies in the order of units up to tens of kHz. There is described the realization of the test equipment enabling a precise compensation of the reactive power of the capacitor and the input minimisation at the testing. It discusses the realization...
A simple analytical copper loss model for inductor is preferred for the design of low-loss and downsized circuits. Air-core inductors, which can avoid core losses and magnetic saturation, are suitable for power converters and wireless charging systems operating at high switching frequencies. This study derives a model for the calculation of the AC resistance of air-core solenoids, which includes the...
As millimeter-wave applications grow there is a corresponding need for device and circuit parameter extraction in those wider frequency ranges where measurement sensitivities and uncertainties are discussed less often. For the case of S-parameter-based extractions, examples will be studied showing how sensitivities and uncertainties in different scenarios affect the extracted results. In particular,...
Deep-silicon etching was applied to an inductor in a 0.25 μm SiGe:C BiCMOS process. Significant increase of quality factor was achieved. Different simulations of the inductor were done with a planar EM simulator. The way how to handle non-homogenous dielectrics in a planar EM simulator is shown. A good agreement between measurement and simulation can be seen. The effect of back side etching is well...
Deep-silicon etching was applied to an inductor in a 0.25 μm SiGe:C BiCMOS process. Significant increase of quality factor was achieved. Different simulations of the inductor were done with a planar EM simulator. The way how to handle non-homogenous dielectrics in a planar EM simulator is shown. A good agreement between measurement and simulation can be seen. The effect of back side etching is well...
Impedance of adhesive joints has been measured in frequency range 20 Hz - 1 MHz using LCR meter HP 4284A. The joints have been created by adhesive assembly of jumpers on test PCBs. It has been found that the joint impedance increases at the frequency higher than 100 kHz. It has been found that the measured frequency characteristics are in correlation with frequency characteristic of an equivalent...
An on-chip buck converter with 3D chip stacking is proposed and the operation is experimentally verified. The manufactured converter achieves a maximum power efficiency of 62% for an output current of 70mA with a switching frequency of 200MHz and a 2x2mm on-chip LC output filter in 0.35mum CMOS. The use of glass epoxy interposer to increase the maximum power efficiency up to 71.3%, and the power efficiency...
The next generation of wireless communication is a ubiquitous radio system concept, providing wireless access from short-range to wide-area, with one single reconfigurable and adaptive system for all envisaged radio environments. This paper presents the design approach of RCO (reconfigurable concurrent oscillator) that simultaneously generates two or more signals of different frequencies that eliminate...
A high intercept points, cost-effective, and power-efficient switching FET double balanced mixer (DBM) is reported. The Switching FET DBM demonstrated in this work offers input intercept points (IIP3) and conversion loss typically 44 dBm and 8.5 dB respectively with 15 dBm LO power for the frequency band (RF: 900-2150 MHz, LO: 850-1950 MHz, IF: 50-200 MHz). The measured interport isolation is typically...
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