RLC circuit

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

Alignment and Adjustment of Synchronously Tuned Multiple-Resonant-Circuit Filters

Abstract: A simple method of "tuning up" a multiple-resonant-circuit filter quickly and exactly is demonstrated. The method may be summarized as follows: Very loosely couple a detector to the first resonator of the filter; then, proceeding in consecutive order, tune all odd-numbered resonators for maximum detector output, and all even-numbered resonators for minimum detector output (always making sure that the resonator immediately following the one to be resonated is completely detuned). Also considered is the correct adjustment of the two other types of constants in a filter. Filter constants can always be reduced to only three fundamental types: f0, dr(1/Qr), and Kr(r+1). This is true whether a lumped-element 100-kc filter or a distributed-element 5,000-mc unit is being considered. dr is adjusted by considering the rth resonator as a single-tuned circuit (all other resonators completely detuned) and setting the bandwidth between the 3-db-down-points to the required value. Kr(r+1) is adjusted by considering the rth and (r+1)th adjacent resonators as a double-tuned circuit (all other resonators completely detuned) and setting the bandwidth between the resulting response peaks to the required value. Finally, all the required values for K and Q are given for an n-resonant-circuit filter that will produce the response (Vp/V)2=1 +(?f/?f3db)2n.

Small signal analysis of resonant converters

Abstract: It is known that the dc-to-dc conversion ratio of resonant converters can be controlled by changing the ratio of switching frequency to resonant frequency. In this work the small signal response of resonant converters to small signal perturbations in the switching frequency and input voltage is determined.

Active Cell Balancing of Li-Ion Batteries Using $LC$ Series Resonant Circuit

Abstract: This paper proposes a new active cell-balancing method for Li-ion batteries. It uses an $LC$ series resonant circuit as an energy carrier, which transfers the balancing energy directly from the highest charged cell to the lowest charged cell. The method requires $N+5$ bilateral switches and one $LC$ resonant circuit, where $N$ is the number of cells in the string of batteries. The balancing speed is improved by allowing energy transfer between any two cells in the battery string, and power consumption for balancing is reduced by operating all switches in the circuit at a zero-current switching condition. An experimental cell-balancing circuit for a 12-cell Li-ion battery string shows that fast and transformerless balancing is possible using the proposed method. Measured power transfer efficiencies were 93.2% and 78.9% at balancing powers of 0.56 and 1.94 W, respectively.

Self-powered circuit for broadband, multimodal piezoelectric vibration control

Abstract: Vibration control using piezoelectric actuators has experienced a strong development these last years. Particularly, non-linear techniques have been proven to be low-cost and efficient ways of damping, with self-powering capabilities. This paper deals with one of these methods, the so-called self-powered synchronized switch damping on inductor (SSDI). Its principles rely on switching intermittently the piezoelement on a resonant circuit. Particularly, it is proposed here a new self-powered device that enhances the broadband nature of the self-powered SSDI. The principles of the circuit are to disable the switching event unless a particular condition is fulfilled. Experimental results show that such a circuit significantly improves the multimodal control abilities of the self-powered SSDI techniques without any external power supply requirements.

Wireless power supply system, wireless power transmitting device, and wireless power receiving device

Abstract: A wireless power supply system includes: a wireless power transmitting device configured to include a variable resonant circuit having a variable-controllable resonant frequency characteristic, and to transmit electric power wirelessly via the variable resonant circuit; a power transmission control unit configured to variably control the resonant frequency characteristic of the variable resonant circuit; and a plurality of wireless power receiving devices configured to include respective unique resonant circuits having respective unique resonant frequency characteristics which are different to each other, and to wirelessly receive power from the wireless power transmitting device by a magnetic field resonance mode arising as a result of the unique resonant circuit tuning to a resonant frequency of the variable resonant circuit