RLC circuit

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

Analysis and Validation of a Planar High-Frequency Contactless Absolute Inductive Position Sensor

Abstract: This paper presents a low cost precise and reliable inductive absolute position measurement system. It is suitable for rough industrial environments, offers a high inherent resolution (0.1%–0.01% of measurement range), can measure target position over a wide measurement range, and can potentially measure multiple target locations simultaneously. The basic position resolution is improved by adding two additional finer pitched receive channels. The sensor works on principles similar to contactless resolvers. It consists of a rectangular antenna printed circuit board and a passive LC resonant circuit. A mathematical model and the equivalent circuit of this kind of sensor are explained in detail. Such sensors suffer from transmitter to receiver coil capacitive crosstalk, which results in a phase sensitive offset. This crosstalk will be analyzed by measurements. Moreover, the mechanical transducer arrangement, the measurement setup, and the measured results will be presented.

Development of a closed-form expression for the input impedance of power-ground plane structures

Abstract: This paper analyzes the fundamental behavior of PCB power bus structures using the modal expansion method. The results are validated by experiments and full-wave numerical modeling. It is shown that the power bus can be modeled as a series L/sub e/C circuit below the first board resonance frequency. C is the interplane capacitance and L/sub e/ is an effective inductance contributed by all the cavity modes. The effects of the layer thickness, port location, board size and the feeding wire radius on the value of L/sub e/ are discussed in this study. L/sub e/ can be estimated from the geometry parameters of the test board. The goal is to obtain a simple model that can be used to analyze the power bus impedance below the first board resonance.

Liquid detection sensor, liquid detection apparatus and liquid detection system

Abstract: A moisture detection sensor that detects liquid, comprising: a resonant circuit composed of an antenna coil 53 and a capacitor C; and a noncontact tag composed of covering materials 51 and 57 that cover the resonant circuit, wherein the capacitor C has a pair of electrodes 52 and 56 and a dielectric 55 interposed between the electrodes 52 and 56 , and the covering material 57 contains a through hole 57 a that allows the liquid to infiltrate into the dielectric 55 from an outside.

Three level auxiliary resonant commutated pole inverter for high power applications

Abstract: A zero voltage switching (ZVS) three level auxiliary resonant commutated pole inverter (ARCPI) is presented for high power GTO inverters. The concept of ARCP for a two level inverter is extended to the three level inverter. The proposed auxiliary commutation circuit consists of one resonant inductor and two bi-directional switches, which provides ZVS condition to the main devices without increasing device voltage or current stresses. The auxiliary device operates with zero current switching (ZCS) which enables use of the low cost thyristors. The proposed ARCPI can handle higher voltage and higher power (1-10 MVA) compared to the two level one. Operation and analysis of the ARCPI are illustrated and the features are compared to those of the snubber circuit incorporated three level inverter. Experimental results with 10 kW, 4 kHz prototype are presented to verify the principle of operation.

Single-stage electronic ballast with class-E rectifier as power-factor corrector

Abstract: A single-stage high-power-factor electronic ballast with a Class-E rectifier as a power-factor corrector is proposed. A Class-E rectifier is inserted between the front-end bridge rectifier and the bulk filter capacitor to increase the conduction angle of the bridge-rectifier diode current for obtaining low line-current harmonics. The Class-E rectifier is driven by a high-frequency sinusoidal current source, which is obtained from the square-wave output voltage of the Class-D inverter through an LC series resonant circuit. A high-frequency transformer is used for impedance matching. The experimental results for a 32-W prototype ballast are given. The switching frequency was 61.3 kHz. At full power, the power factor was 0.992 and the total ballast efficiency was 88.3%. The lamp-current crest factor was about 1.36. The simulated and experimental results were in very good agreement.