RLC circuit

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

Optimal Design of Diode-Bridge Bidirectional Solid-State Switch Using Standard Recovery Diodes for 500-kV High-Voltage DC Breaker

Abstract: At present, it is usually necessary to use fast recovery type diodes to cooperate with the fast switching actions of fully controlled devices such as insulated-gate bipolar transistors (IGBTs). However, the specific nature of the working conditions of the diode-bridge bidirectional solid-state switch (DBSS) provides an opportunity to apply standard recovery diodes for this purpose, which helps to reduce the cost of the bidirectional switch. This letter presents the self-oscillation phenomenon that is caused by the recovery processes of the diodes in a DBSS. Then, the recovery effects of these diodes in different topologies are analyzed from the perspective of the DBSS and optimized designs for both the snubber circuit and the energy-absorbing circuit are proposed. A 500-kV dc breaker is realized based on the proposed DBBS using the standard recovery diodes, which can work reliably with IGBTs, and the cost of the resulting dc circuit breakers is greatly reduced.

High-frequency lamp operating circuit

Abstract: Circuit operating from a low-voltage current source for applying high-voltage, high-frequency alternating current to a load such as a gaseous discharge lamp connected across the source includes a charging capacitor and a first induction coil connected across the source and forming a first resonant circuit, a second induction coil and a controlled rectifier switch connected in series across the capacitor forming a second resonant circuit when the controlled rectifier switch is closed, and triggering means connected to the source for operating the controlled rectifier switch in accordance with a predetermined rate, the second resonant circuit operating to close the controlled rectifier switch, and the first resonant circuit operating when the switch is opened to raise the voltage and apply it to the load in high-frequency pulses for starting and operating the same.

Optimal topologies of resonant DC/DC converters

Abstract: Generalized and optimal topologies of zero-voltage-switching and zero-current-switching resonant DC/DC power converters are presented. It is shown that many equivalent topologies of the converters can be derived from each of the generalized topologies. The generalized topologies of the converters show clearly which of the parasitic capacitances and inductances can be absorbed into the LC resonant circuit. Utilizing this fact, optimal topologies that are the most suitable for high-frequency operation are derived. In the optimal topologies, the greatest possible number of parasitic reactances is included harmlessly in the resonant circuit. Optimum layout and component selection guidelines for the converters are given. High-order resonant converters are also developed. >

Resonance frequency shift canceling in wireless hearing aids

Abstract: Systems, devices and methods are provided to switch between transmit and receive modes in wireless hearing aids. Various aspects of the present subject matter relate to a communication system. Various embodiments of the communication system include an antenna with a resonant circuit having an inductive coil connected to a tuning capacitor. The communication system includes means to selectively drive the resonant circuit during a transmit mode, and means to selectively receive an induced signal in the resonant circuit during a receive mode. The communication system further includes means to selectively include a frequency shift canceling component in the resonant circuit to provide a first resonance frequency in the resonant circuit in the transmit mode and a second resonance frequency in the resonant circuit in the receive mode such that the first resonance frequency and the second resonance frequency are approximately equal. Other aspects are provided herein.

Series resonant converter comprising a control circuit

Abstract: The invention relates to a series resonant converter ( 1 ) comprising a control circuit ( 8 ) for controlling the output voltage of the converter. To improve the behavior of the converter, it is proposed that the control circuit ( 8 ) is provided for processing a first actual value (U out ), which depends on the respective converter output voltage (u out (t)) and for processing a second actual value (U C ), which depends on the respective current (i res (t)) flowing through the series resonant circuit elements (C, L, R) of the converter ( 1 ), and that the control circuit ( 8 ) is provided for delivering a correcting variable (u) determining the scanning ratio of a pulse-width modulated voltage (u pwm (t)) delivered to the series resonant circuit of the converter.