Showing papers on "Filter capacitor published in 1969"

Locating Shunt Capacitors on Primary Feeder for Voltage Control and Loss Reduction

Abstract: A method of applying shunt capacitors for voltage control and peak loss reduction is discussed. The concept is extended to the optimization of total monetary savings due to both peak loss and energy loss reductions. A computer program is developed to aid engineers in the application of such a method.

Voltage-variable, ferroelectric capacitor

Abstract: This disclosure discusses voltage-variable capacitors, including ferroelectric, ceramic-dielectric capacitors that are variable by control of the potential gradients within their dielectric material. This disclosure describes voltage-variable, dielectric capacitors that have a plurality of electrodes spaced throughout the dielectric with control-voltage potentials of alternately opposing polarity to achieve a higher potential gradient within the dielectric than would be possible from a given control voltage supply to a single pair of electrodes on opposing sides of the dielectric.

Transformerless power supply

Abstract: The power supply circuit receives as an input an AC line voltage, rectifies the line voltage to DC and transforms the voltage downwardly to a much lower level. No transformer is employed but rather the power supply circuit includes a plurality of capacitors which are charged in series by the line voltage and discharged in parallel across the load. The charging and discharging is controlled by a diode and transistor connected to each capacitor and to each other so that the diode conducts during the charging and then maintains the transistor nonconductive and the transistor conducts during the discharge when the diode is nonconductive.

High current switching regulator with overlapped output current pulses

Abstract: A switching regulator circuit is disclosed for use with power supplies supplying a high DC current output. The circuit utilizes a plurality of controlled rectifiers and inductive reactors with sequential gating of the rectifiers at regular intervals for providing overlapped output current pulses from the reactors thereby delivering high output currents with relatively low RMS ripple currents in input and output filter capacitors, as well as relatively lower RMS current through the controlled rectifiers. The reduced RMS value of ripple currents permits the use of input and output filter capacitors and controlled rectifiers having lower ripple current ratings thereby improving the electrical efficiency by reducing resistive losses in the filter capacitors and facilitating a reduction in size and volume for power supplies having a given current rating.

Low voltage dc control of voltage-variable capacitors

Abstract: This disclosure covers voltage-variable capacitors, and circuits for applying a control voltage to voltage-variable capacitors. More particularly, this disclosure is of circuits for connecting a plurality of voltage-variable capacitors to be actuated by a common control voltage.

Digital-to-analog conversion circuits

Abstract: Digital-to-analog conversion circuits are described in which a plurality of capacitors are charged by digitally weighted voltages. The capacitors are then placed in series to provide an analog output voltage. A system is also shown in which a plurality of these digital-to-analog conversion circuits are operated from a common voltage source.

Method of making vacuum capacitors

Abstract: THE DISCLOSURE INCLUDES A METHOD OF PROCESSING A VACUUM DEVICE SUCH AS A VACUUM CAPACITOR SO AS TO INCREASE ITS USEFUL LIFE UNDER CONDITIONS OF SUPERIMPOSED DIRECT CURRENT, FAR BEYOND THE PRESENT STATE OF THE ART. VACUUM CAPACITORS, WHEN USED AS DC BLOCKING CAPACITORS IN RF CIRCUITS, SLOWLY DEGRADE IN VOLTAGE CAPABILITY. THE DEGRADATION BECOMES APPARENT WHEN DC OR DC PLUS RF VOLTAGES ARE APPLIED TO THE CAPACITOR. THE PRESENT DISCLOSURE SOLVES THE DEGRADATION PROBLEM BY APPLYING AN ALTERNATING VOLTAGE TO THE CAPACITOR ELECTRODES IN THE PRESENCE OF AN INERT GAS AT LOW PRESSURE AND HERMETICALLY SEALING THE CAPACITOR WITHOUT THE REMOVAL OF ADSORBED GAS.

Broadband low-pass filter

Abstract: Broadband low-pass filters containing inductors and/or capacitors wherein resonances of a main inductor and/or capacitor are obviated by utilizing single-turn inductors and/or low distributed inductance capacitors which have no self resonances below 200 MHz. and whose resonances do not coincide with the self resonances of the main components. The auxiliary components are connected so as to maintain the high-insertion loss of the filter at the self-resonant frequencies of the main components.

Ceramic capacitors for hybrid integrated circuits

Abstract: Ruggedness, wide capacitance range, high volumetric efficiency, and relatively attractive cost have been the main reasons for the popularity of ceramic chip capacitors. Continuing improvements in most of these categories promise to keep the ceramic chip in its present position of prominence. This article considers multilayer, single-layer, and screened-on configurations. In addition, relationships between size, capacitance, and cost are covered for three common ceramic formulations (NPO, W5R, and Z5U).

Motor Starting with Capacitors

Abstract: A portion of the high-inrush incident to starting of large synchronous motors can be supplied by static capacitors because of the low power factor of the inrush kVA. However, care must be exercised in application of the static capacitors so as to avoid harmful resonant conditions, overvoltage due to self excitation of the motor and the proper selection or sizing of equipment for a specific application. An installation in a cement plant of large synchronous grinding mill motors employing static capacitors for motor starting is reviewed. Some of the considerations in application are shown and results of operation are also shown.

High frequency band-pass filter

Abstract: A high frequency band-pass filter is disclosed. The filter includes an input resonator and an output resonator decoupled by means of a capacitor common to both resonators. A pair of capacitors are provided for impedance transforming into and out of the resonators, respectively. The aforementioned capacitors and the two resonator capacitors are formed by a stack of insulatively immediately overlaying conductive plates stacked over a ground plane. The conductive plates have mutually opposed areas which decrease in the ascending direction of the stack. The two inductors of the tuned circuits are formed by a pair of short sections of transverse electromagnetic transmission line connected between a pair of plates in the stack and the ground plane.

Wave filter with lossy inductors and capacitors

Abstract: 1,183,484. Filter networks. B. LILJEBERG. 6 March, 1967, No. 10507/67. Heading H3U. A low-pass filter network is built-up from lossy inductors and capacitors which contribute resistance features. For example, as shown, inductor L 2 has a resistance R 2 and capacitor C 1 has a resistance G 1 . The circuit values are: L 2 = 0A511 mH, L 4 = 0A191 mH, R 2 = 264 ohm, R 4 = 419 ohm, C 1 = 330 AAF, C 3 = 2425 AAF, G 1 = 5700 ohm, G 3 = 790 ohm. The bulk of the specification is devoted to the analysis and synthesis of the network.

Commutation circuit for scr{3 s

Abstract: An inverter circuit includes a pair of conventional commutating capacitors, coupled in series between the input conductors. Additional pair of commutating capacitors is provided, and an inductor is coupled between the common connection of the additional capacitors and the common connection of the conventional commutating capacitors.