RLC circuit

About: RLC circuit is a research topic. Over the lifetime, 14490 publications have been published within this topic receiving 142697 citations.

Power supply system

Abstract: PROBLEM TO BE SOLVED: To suppress variation in inductance of a feeder line for supplying power in non-contact manner. SOLUTION: A resonant capacitor 111 is connected to a feeder line 110, constituting a resonance circuit together with the feeder line 110. A feeder line pseudo unit 120 is connected in parallel to the feeder line 110. A power source 300 outputs an AC current of specified frequency to the feeder line 110 by an inverter circuit. The switching frequency of the power source 300 is so adjusted as to agree with the resonance frequency of a circuit consisting of the feeder line pseudo unit 120 and resonant capacitor 111 as well as the feeder line 110. An inductive reactance component ln occurs at the feeder line 110 when a mobile body receives power supply from the feeder line 110, however, since a reactor Lp and resistor Rp are connected in parallel to the ln, the effect of ln is suppressed. COPYRIGHT: (C)2009,JPO&INPIT

Optimal resetting of the transformer's core in single ended forward converters

Abstract: The transformer's core in single ended forward converters is reset by a "magnetizing current mirror" consisting of a capacitor in series with an auxiliary switch which, during the OFF period of the primary switch, couples the capacitor to one of the transformer's windings to form a resonant circuit with the transformer's magnetizing inductance. The resonant circuit recycles the transformer's magnetizing energy by creating a mirror image of the magnetic flux between ON periods. This maximizes the flux swing available within a given core. The voltage stress on the primary switch is minimized as the voltage across the switch during the OFF period is approximately constant and automatically tailored to avoid dead time for arbitrary values of the switch duty cycle.

Wireless power transmission device

Abstract: In one embodiment, a power reception device includes a load circuit, to which a first signal having a first power value is supplied from a first resonance circuit connected to a power reception coil, and a first transceiver which transmits the first power value to a power transmission device. The power transmission device includes a second resonance circuit including a plurality of inductors and capacitors to which a second signal having a second power value is input, a power transmission coil connected to the second resonance circuit, a second transceiver which receives the first power value from the first transceiver, and a first control circuit which calculates power transmission efficiency using the first power value and the second power value and adjusts at least one of inductance values of the inductors and/or at least one of capacitance values of the capacitors based on the power transmission efficiency.

Analysis of on-chip inductance effects for distributed RLC interconnects

Abstract: This paper introduces an accurate analysis of on-chip inductance effects for distributed RLC interconnects that takes the effect of both the series resistance and the output parasitic capacitance of the driver into account. Using rigorous first principle calculations, accurate expressions for the transfer function of these lines and their time-domain response have been presented for the first time. Using these, a new and computationally efficient performance optimization techniques for distributed RLC interconnects has been introduced. The new optimization technique has been employed to analyze the impact of line inductance on the circuit behavior and to illustrate the implications of technology scaling on wire inductance. It is shown that reduction in driver output resistance and input capacitance with scaling can make deep submicron designs increasingly susceptible to inductance effects if global interconnects are not scaled. For scaled global interconnects with increasing line resistance per unit length, as prescribed by the International Technology Roadmap for Semiconductors, the effect of inductance on interconnect performance actually diminishes.

Wireless Power Transfer by Electric Field Resonance and Its Application in Dynamic Charging

Abstract: In this paper, the electric field resonance (EFR) method, similar to the four-coil configuration of the magnetic field resonance wireless power transfer, is proposed for the capacitive coupling power transfer. The characteristics of the proposed method are derived and analyzed. With the EFR method, not only unity power factor for the power source is achieved, but also high power factor and low reactive power for the capacitive coupling stage are achieved. Effective power transfer is realized by the EFR method. Based on the proposed method, a dynamic charging concept for railway vehicles is then proposed. A prototype powering system is designed and built to prove the validity of the proposed method. Analytical, simulation, and experimental results are given and compared. A 23-cm model vehicle is put on a 150-cm track. It is shown that about 700-W power is transferred through a 24-pF coupling capacitor. The proposed method reaches 91% dc–dc overall efficiency at switching frequency 2 MHz.