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This paper presents the design procedures of an unity-power-factor AC-DC power converter for wireless power transfer application. This newly proposed AC-DC converter consists of two stages: the PFC front stage uses LC series resonant circuit to perform power factor conditioning and the second stage uses a DC-DC converter to regulate the output voltage. New equations to describe the input impedance...
The performance of a shunt capacitor low-pass filter at high frequencies is limited by the mutual inductance appearing between the input loop, defined by the noise source and the capacitor, and the output loop created by the capacitor and the loading impedance. In this work we present a simple modification of the layout of the shunt capacitor filter that allows to decrease the impairing effect of...
This contribution presents results from an investigation into conducted emissions of an automotive inverter in a component level EMC test setup with unshielded cables. The primary goal of the investigation is to develop a profound understanding of the shape of the disturbance voltage's frequency spectrum at the line impedance stabilization network. Complying with that objective, common-mode currents...
Conventional techniques for on-chip input and ground ringing suppression in high-frequency buck converters include slowing-down the gate-drive signals of the power switches, employing a RC snubber circuit, or introducing on-chip decoupling capacitors to ensure the resonance frequency of the impedance network at the input is much lower than switching frequency of the converter. The first two techniques...
Radiation characteristics of an input decoupling network for switching DC-DC converters are analyzed by a set of electromagnetic (EM) simulations. Input decoupling network is a part of a DC-DC converter with a dominant contribution to its radiated emissions. The impact of geometrical parameters of an input decoupling network such as the dimensions of metal plates on a printed circuit board (PCB),...
Power delivery is a well-known challenge for high-end microprocessor systems. Comparatively, mobile computing platforms typically consume order-of-magnitude lower currents, but economic and volume constraints limit the quality of the Power Delivery Network. In addition, the trend towards GHz+ operating frequencies and the ubiquity of low-power techniques such as clock-gating and power-gating, make...
Three-phase Z-source inverter (ZSI) is a relatively new buck-boost-type inverter topology, which in photovoltaic (PV) applications offers more efficient power point tracking than traditional VSI-type inverter in a single power processing stage. This paper presents an accurate small-signal model for the impedance network present in three-phase grid-connected ZSI, which can be used to e.g. design its...
Induction heating of aluminum cookware is difficult due to its low resistivity and lack of ferromagnetic properties. Both of these factors result in an effective impedance reflected through the work coil that is too low for practical inverter design and makes efficient coil design difficult. This paper presents a transformer-coupled topology as a means of efficiently delivering the desired amount...
The uniform lumped element transmission line that exhibits translational symmetry is an inherently dispersive network. The dispersion properties can be transformed by imposing a harmonic symmetry that requires all of the resonant frequencies of the network to be integral multiples of some fundamental frequency. The resulting line will have spatially varying component values, thus breaking the network's...
Power supply bypass capacitors are critical to the operation of high-frequency analog and digital circuits, yet are seldom considered in the depth they deserve. This paper investigates their use and the resulting power integrity effects as seen from an RFIC bondpad looking out to a host PCB. We show how designs can be either successful or unsuccessful depending on the capacitor values selected and...
Inductive power transfer (IPT) is used to transfer the power over relatively large air gap using the resonant phenomena. The use of IPT in the Railway transportations will enhance the system performance in terms of reducing the on board energy requirements, minimizing the visual pollution, and reducing the infrastructure. The main challenge in IPT is to transfer efficiently the power from the primary...
This paper compares three current control methods for LCL-filtered grid-connected inverters, they are single-loop control based on inverter current feedback, that based on grid current feedback, and dual-loop control with capacitor current feedback active damping. The virtual impedance introduced by each method is identified, which comprises frequency-dependent resistance and reactance. The reactance...
This work focuses on measuring precise values of passive elements such resistors, inductors and capacitors through non-contact means through inductive coupling for series and parallel. Resonant circuit is used for selective identification of high frequency components. However, if one of the circuit components such as the inductance, capacitance or resistance is made to vary, it will cause a change...
This paper presents a design methodology for LLC resonant converters with capacitor–diode clamp for current limiting in overload conditions. A new fundamental harmonic approximation-based equivalent circuit model is obtained through the application of describing function techniques, by examining the fundamental behavior of the capacitor–diode clamp. An iterative procedure to determine the conduction...
This paper presents a practical study on variable frequency, variable load and variable distance of a planar contactless power transfer (CPT) system. The study investigates the behavior of CPT system under three different cases and its characteristics plots are generated for wide range of frequency, load and distance such that the real time situations of CPT systems can be analyzed. With these results...
Modern high-frequency induction heating technology puts forward higher requirements for load matching of the induction heating power supply. LLC resonant load circuit can replace the traditional induction heating load matching transformer, and increase power density. This paper analyzes the load matching characteristics of LLC load resonant circuit in high frequency induction heating power supply,...
Typical wireless power transfer systems utilize series compensation circuit which is based on magnetic coupling and resonance principles that was first developed by Tesla. However, changes in coupling caused by gap distance, alignment and orientation variations can lead to reduce power transfer efficiencies and the transferred power levels. This paper proposes impedance matched circuit to reduce frequency...
A design method for the balanced Composite Righ-/Left-Handed (CRLH) is proposed and validated numerically. The method is developed for a CRLH equivalent circuit which takes into account the resonance frequency of the series capacitors, while the parallel resonator is specified by its admittance which may be particularized for any practical implementation. Numerical results are presented for three...
Many active damping (AD) techniques have been proposed to deal with current oscillation in grid-tied voltage source inverter with an LCL filter. Among them, the proportional-capacitor-voltage-feedforward (PCVFF) has been found to be an effective way. However, there is a lack of detailed modeling, design, and analysis of the PCVFF. This paper will elucidate the characteristics of the PCVFF AD scheme...
A straightforward method is proposed in this paper to optimally design the damping sections of the LCL or LCL plus trap filters. The proposed method simplifies the iterative design procedure of the overall filter while ensuring minimum resonance peaking and smaller capacitor than otherwise would be the case. The choice of the traps parameters in case of adopting multi-tuned traps is systematically...
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