RLC circuit

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

Rhodochrosite as Crystal Oscillator

Abstract: h as crystals, certain ceramics, and biological matter such as bone, DNA and various proteins) in response to applied mechanical stress, phenomenon called piezoelectricity. A crystal oscillator is an electronic oscillator circuit that uses the mechanical resonance of a vibrating crystal of piezoelectric material to create an electrical signal with a precise frequency. The most common type of piezoelectric resonator used is th quartz crystal, so oscillator circuits incorporating them became known as crystal oscillators. Particularly one using a quartz crystal, works by distorting the crystal with an electric field, when voltage is applied to an electrode near or on the crystal. This property is known as electrostriction or inverse piezoelectricity. When the field is removed, the quartz - which oscillates in a precise frequency - generates an electric field as it returns to its previous shape, and this can generate a voltage. The result is that a quartz crystal behaves like an RLC circuit, but with a much higher Q. Quartz crystals are manufactured for frequencies from a few tens of kilohertz to hundreds of megahertz. More than two billion crystal are manufactured annually. Most are used for consumer devices such as wristwatches, clocks, radios, radios, computers, cell phones, signal generators and oscilloscopes

Linear Generator Connected to a Resonance-Rectifier Circuit

Abstract: This paper describes a linear direct driven generator used for wave energy utilization. The generator is placed on the seabed and connected to a buoy on the ocean surface. Due to the reciprocating motion of the translator, an electrical conversion system is needed between the wave energy converter (WEC) and the grid. Depending on how the conversion system is designed, the generator will be subjected to different loads. A novel conversion system is presented in this paper where the voltage from the WEC is rectified in a resonance circuit. Both simulations and experiments are performed on the circuit. The results from the simulations show that a higher power absorption and power production can be achieved with the resonance circuit compared to a WEC connected to a passive rectifier. A WEC, L9, developed by Uppsala University (Uppsala, Sweden) was used in the experiment. Significantly higher power absorption was obtained for L9 compared to power data from the first installed WEC, L1, at the Lysekil research site.

Adjustable Frequency Quasi-Resonant InverterCircuits Having Short-Circuit SwitchAcross Resonant Capacitor

Abstract: Recently dual frequency induction heating is often performed for hardening an uneven work-piece such as a gear which has tips and bottoms, and two resonant inverters are necessary for such heating. In this paper, new quasi-resonant inverter circuits including a resonant capacitor with a short-circuit switch, which can operate at various frequencies are discussed. First, an equivalently variable resonant capacitor having a short-circuit switch in parallel is described for varying output frequency of the quasi-resonant inverter. Then, two types of adjustable frequency quasi-resonant inverter circuits including the variable resonant capacitor are reported in every desired range of the adjustable output frequency. Additionally a new indirect power control method is proposed since the power to the work-piece cannot be directly detected in operation and the equivalent output resistance of the heating circuit is unknown.

Voltage control type oscillator

Abstract: An inexpensive voltage control type oscillator suitable for use with a mobile radio communication system within a predetermined frequency band range. The oscillator includes a resonance circuit and an oscillation stage formed on a printed wiring board and operating such that the oscillation frequency of the oscillation stage is varied within a predetermined frequency band range by varying the resonance frequency of a parallel resonance circuit included in the oscillation stage on the basis of a control voltage. The parallel circuit comprises a strip line connected in series with a bias resistor and a chip capacitor connected parallel to the strip line. The strip line has an inductance sufficiently larger than that of the resistor and the chip capacitor has a capacitance value so determined that the capacitor resonates at a predetermined frequency in cooperation with the strip line.

Switching power-supply apparatus

Abstract: A switching power-supply apparatus includes a first converter 3, a second converter 4, an output smoothing capacitor Co 1, a series resonance circuit 1 and a control circuit 11. The first converter 3, in which switching elements Q 11 and Q 12 are connected to both ends of a direct-current power-supply Vin in series, and a capacitor C 11 and a primary winding Np 1 of a transformer T 1 including an auxiliary winding Na 1 are connected to both ends of the switching element Q 12 in series, includes diodes D 11 and D 12 that rectify voltages generated in secondary windings Ns 11 and Ns 12 of the transformer T 1. The second converter 4, in which switching elements Q 21 and Q 22 are connected to the both ends of the direct-current power-supply Vin in series, and a capacitor C 12 and a primary winding Np 2 of a transformer T 2 are connected to both ends of the switching element Q 22 in series, includes diodes D 21 and D 22 that rectify voltages generated in secondary windings Ns 21 and Ns 22 of the transformer T 2. The output smoothing capacitor Co 1 smoothes currents output from the diodes D 11, D 12, D 21 and D 22. The series resonance circuit 1 includes a resonance reactor L 1 and a resonance capacitor C 1 connected to the auxiliary winding Na 1 in series. The control circuit 11 turns on/off the switching elements Q 21 and Q 22 according to a current flowing in the series resonance circuit 1.