97 results about "Capacitive divider" patented technology

An energy-efficient consumer device audio power output stage provides improved battery life and reduced power dissipation. A power supply having a selectable operating mode supplies the power supply rails to the power amplified output stage. The operating mode is controlled in conformity with the audio signal level, which may be determined from a volume control setting of the device and/or from a signal level detector that determines the amplitude of the signal being amplified. The power supply may be a charge pump in which the operating mode uses a capacitive divider to provide for selection of a power supply output voltage that is a rational fraction of the power supply output voltage in a full-voltage operating mode.

The simulating experiment equipment for local discharge in gas insulated combined electric appliance consists of inducing pressure regulator, no-corona experiment transformer, no-local discharge protecting resistor, standard capacity voltage divider, GIS simulating experimental device, internal UHF antenna sensor and external UHF antenna sensor, microstrip line filtering amplifier, intelligent UHF multiplexer, wide band high speed ultrahigh capacirty digital storage oscilloscope and microcomputer. The simulating experiment equipment and method for local discharge in gas insulated combined electric appliance may be used for simulating various defaults inside GIS to obtain PD experiment data reflecting various kinds of insulation defaults and distinguish the PD modes of the insulation defaults in GIS, so that the present invention may be used widely in relevant theoretical analysis and application research.

The invention relates to a multi-region detection system for the partial discharge decomposition components of insulating gas and a method thereof, which belong to the technical field of on-line gas-insulated equipment insulation monitoring. The system comprises a voltage regulator, an isolation transformer, a corona-free test transformer, a partial discharge-free protective resistor, a capacitive divider, an insulating gas discharge decomposition device, an ultrahigh-frequency antenna, an oscillograph, a gas chromatograph-mass spectrometer and the like, and the insulating gas discharge decomposition device comprises a housing, insulating sleeves, connecting rods, electrodes, valves, a vacuum meter, a gas pressure meter, a vacuum pump, an SF6 gas bottle, a pure compressed air bottle and the like. The method utilizes the system to respectively detect the discharge decomposition components of multiple regions in the insulating gas discharge decomposition device. The invention can accurately detect the components and component contents of the decomposed gas of a main gas chamber, a glow discharge region and an electron drift region and provide a standard. The invention can be widely applied to the on-line monitoring of gas-insulated equipment insulation, in particular to the on-line monitoring of GIS (gas-insulated switchgear) insulation.

Method, apparatus and computer programs are described for compensating for the effect of temperature on the sensitivity of electrostatic ultrasound (US) transducers, particularly as used in an automotive occupancy sensing (AOS) systems for sensing the nature or type of occupant and the location of the occupant with respect to the vehicle interior. The invention permits the AOS to classify the occupancy state of the vehicle from a US echo signal substantially free of the effects of temperature on signal amplitude. A capacitive divider or voltage monitor is employed to measure the capacitance of the transducer. The voltage monitor output is used by the scaling algorithm of a compensator to determine the scaling factor to be applied to the US transducer signal to compensate for the effect of temperature on the transducer sensitivity. Calibration procedures and software are disclosed for determining the coefficients of the scaling algorithm to compensate for temperature effects and also to compensate for installation factors, transducer manufacturing variations, and circuit board effects. The system disclosed is useful for other types of signal processing in addition to temperature compensation of AOS ultrasonic signals, and may be used in other ranging devices such as cameras, golf or binocular range finders, and measuring devices and instruments.

A method and apparatus for compensating a bias voltage at the wafer by measuring RF voltage signals in RF driven plasma including at least an electrostatic, chuck (ESC), a capacitive divider, a signal processing and signal conditioning network is disclosed. The bias compensation device includes a capacitive divider to detect the RF voltage at the ESC, a signal conditioning network for the purpose of filtering specific RF signals of interests, and a signal processing unit for computing the DC wafer potential from the filtered RF signals.

The present invention is a novel method and computer program product which utilizes an interface capacitor formed by the metal of the probe tip, a dielectric layer, such as an oxide, formed by a contaminant on a solder bump and the metal of the solder bump. The interface capacitor forms a capacitive divider with the inherent capacitances of the automatic test equipment and the device under test (DUT). The voltage characteristics of the capacitive divider are used to drive voltage signals across the interface capacitor to test the DUT. In either direction (i.e. from the automatic test equipment to the DUT or vice versa), by altering the voltage output high amplitude of the driver and/or the voltage input high amplitude of the load, the DUT is validly tested through the interface capacitor. Thus, even if all I/O bumps have an oxide layer, the device may still be validly tested.

The invention provides a comparator with adjustable reference voltage, which is applied to sub digital-analog conversion module design in digital-analog conversion circuits in high-speed pipelines. Based on a traditional capacitive divider comparator with adjustable reference voltage, the invention proposes a pre-chargeable capacitive divider comparator to conveniently adjust the judgment threshold voltage of the comparator. Compared with a traditional capacitive divider comparator with adjustable reference voltage, the pre-chargeable structure reduces the judgment threshold level offset voltage of the comparator, and relieves a series of design difficulties caused by over high or over low judgment threshold voltage in traditional structure.

Systems and methods for measuring alternating current (AC) voltage of an insulated conductor (e.g., insulated wire) are provided, without requiring a galvanic connection between the conductor and a test electrode or probe. A non-galvanic contact (or “non-contact”) voltage measurement system includes a variable capacitance subsystem which operates to generate a variable capacitive voltage between an insulated conductor under test and earth ground. During measurement, the non-contact voltage measurement system varies the capacitance of the variable capacitance subsystem to change the impedance of a capacitive divider circuit between the insulated conductor under test and earth ground. By sequentially making two (or three) measurements across the variable capacitance subsystem, the AC voltage of the insulated conductor can be determined without requiring any galvanic connection to the insulated conductor. The determined AC voltage of the insulated conductor may then be presented to an operator and/or communicated to an external device.

The invention provides an on-site CVT integrated verification system, which comprises a test power supply, a standard appliance, a measuring apparatus and a vehicle-mounted test platform. The test power supply consists of a series reactor, an exciting transformer and a voltage regulator; the standard appliance comprises a high-tension bushing, a standard voltage transformer and a standard capacitor, wherein the high-tension bushing, the standard voltage transformer, the standard capacitor and the series reactor are designed into an integrated sulfur hexafluoride SF6 closed combined electrical apparatus (GIS); and the standard voltage transformer is designed into an SF6 gas insulated reclining posture type structure. The system of the invention can conveniently, accurately and reliably verify the ratio error of on-site 220Kv to 500 Kv CVT (capacitor voltage transformer), the capacitance of a capacitive divider, the medium loss, and the like without unloading from a vehicle. The additional error guided by the measuring system is relatively fixed and is easy to measure, wherein the variation thereof is less than or equal to 0.02 percent.

An on-chip impedance matching includes a transistor, an inductor, and a capacitive divider. The gate of the transistor is operably coupled to receive input signals; the source of the transistor is coupled to a first DC voltage potential; and the drain of the transistor is operably coupled to the inductor. The other end of the inductor is operably coupled to a second DC voltage potential. The capacitive divider includes matched capacitors that, in combination with the inductor, provide for substantially lossless on-chip impedance matching, where a tap of the capacitive divider provides an output of the on-chip impedance matching power amplifier. In addition, the capacitance of the capacitive divider and the inductance of the inductor are tuned to provide a tank circuit for the on-chip impedance matching power amplifier.

The invention relates to a DC/AC conversion structure, preferably intended for photovoltaic systems, having a high yield across the entire input voltage range thereof, thereby guaranteeing that direct current is not injected into the alternating current network. In a preferred embodiment, the circuit includes six switching elements (T1 to T6) controlled by a command unit. In addition, the circuit includes a capacitive divider (C4 and C5) having the negative of the photovoltaic field connected to one of the ends thereof and a network terminal connected at the mid-point of same, which minimises problems of electromagnetic compatibility.

The invention discloses a method for performing an on-site partial discharge test on an ultrahigh voltage converter transformer. The method is characterized in that: by using a test system consisting of a variable frequency power supply (1), a test transformer (2), a capacitive divider (3), a compensating reactor (4), a partial discharge test system (6), an ultrasonic positioning system (7), an ultraviolet imaging system (8), a wideband partial discharge on-line detection system (9) and a test object ultrahigh voltage converter transformer (5), the test object ultrahigh voltage converter transformer is subjected to the on-site partial discharge test by a method of symmetrical voltage application and interfering recognition. The method has the advantages that: 1, the ultrahigh voltage converter transformer is subjected to the on-site partial discharge test at home and abroad for the first time; 2, the ultrahigh voltage converter transformer is subjected to the on-site partial dischargetest by an interfering recognition technology and the method of the symmetrical voltage application for the first time; and 3, forceful technical support is supplied to the advanced running of the first +/-800kV ultrahigh voltage direct-current demonstration project in the world.

The invention belongs to the field of power system transformer devices, and provides an extra-high-voltage capacitor voltage transformer with high precision, quick response and field validation avoidance. The extra-high-voltage capacitor voltage transformer comprises a capacitive divider with equal potential shielded double-layer coaxial capacitor assemblies and an electromagnetic unit with an energy storage element-free ferromagnetic resonance suppressor and a middle transformer, wherein the capacitive divider and the electromagnetic unit are connected in series to form the voltage transformer. The extra-high-voltage capacitor voltage transformer can meet the requirement of accurate measurement of power frequency alternating voltage of super-high-voltage to extra-high-voltage grade power grids and quick and reliable motion of relay protection. A measured main capacitor is in a good shielded state, and the capacitance can be greatly reduced, so the weight of the divider can be greatly reduced, and the shock-proof property of the thin and high divider is improved.

The invention discloses an automatic metering device for distribution transformers, in particular to an automatic metering device arranged inside a distribution transformer, belonging to local or remote power distribution management system field. The invention comprises a voltage transformer, a current transformer, a high voltage capacitive divider, a suspension type power supply unit, a metering unit, a monitoring unit for distribution transform parameters, and a wireless transmission unit. The invention has the advantages that a primary side of the distribution transformer can be metered; as the invention can simultaneously meter the secondary side of the distribution transformer, thus the distribution transformer loss of system can be calculated, the monitoring management level of distribution then can be improved obviously, and the invention can also apply in remote distribution management systems conveniently.

The present invention relates to monitoring of deformation of a power distribution network transformer low-voltage winding, specifically to a power distribution network transformer low-voltage winding deformation on-line monitoring device and method. The invention solves the problem that conventional off-line detecting technologies cannot monitor the transformer winding deformation state timely. The monitoring device comprises an industrial control computer, a pulse signal generator, a capacitive divider, a current transformer, and a data acquisition module. The monitoring method comprises the steps of a) detection signal injection; b) response signal detection; c) data acquisition; and d) analysis and determination. According to the monitoring device and method, the hardware structure is simple; the method is effective; the work is reliable; and the on-line monitoring of the deformation of the power distribution network transformer low-voltage winding is realized.

The invention relates, inter alia, to a method for measuring the voltage (UE) on a conductor (30) by means of a measuring arrangement (10) having a capacitive divider (20) coupled to the conductor and a measuring device (70), wherein, in the method, the voltage (UA) at the low-voltage terminal (U20) of the capacitive divider, the high-voltage terminal (020) of which is connected to the conductor, is measured with the formation of a low-voltage measurement value (UA1, UA2) and a measurement value (ik) indicating the voltage on the conductor is formed with the low-voltage measurement value, wherein in order to form the measurement value, the measured low-voltage measurement value is corrected by means of a correction element (110) having an inverse transfer function (Gcorr) with respect to the transfer function (G) of the measurement arrangement. The invention provides for determining a time constant (Tl) of the transfer function of the measurement arrangement on the basis of the voltage at the low-voltage terminal for two different load states (Zl, Z2) at the low-voltage terminal, and for determining the inverse transfer function taking account of said time constant.

An electronic device comprises a controllable capacitor bank and a capacitive divider arranged in parallel with the capacitor bank and configured to linearize the capacitor bank in a linearization frequency range of a frequency characteristic of the electronic device. The capacitive divider comprises a series arrangement of a first series capacitance, and a main capacitor bank. A control circuit coupled to one or more control inputs of the capacitive divider and controllable capacitor bank is configured to modify the equivalent capacitance of the capacitive divider and the controllable capacitor bank for providing capacitance steps, each capacitance step being variable over frequency such that for each step a frequency change Δf of the frequency characteristic is maintained constant in the linearization frequency range.

A circuit for reducing standby leakage in a memory unit contains a capacitive divider coupled to the memory unit so as to generate a voltage across the memory unit, which is adequate to retain memory values during one of a sleep state and a standby state. An inductive circuit for reducing standby leakage in a memory unit includes an inductive divider coupled to the memory unit so as to generate a voltage across the memory unit, which is adequate to retain memory values during one of a sleep state and a standby state.

The invention relates to the field of an electric power system and particularly relates to an overvoltage on-line monitoring device and method. The device comprises a voltage transformer connected with a high-voltage bus, a capacitive divider connected with the voltage transformer through a cable, a data collection card connected with the capacitive divider and an industrial control computer connected with the data collection card. The method comprises: (1), utilizing a voltage transformer carried by a transformer station itself to acquire voltage signals on a high-voltage bus; (2), transmitting the acquired voltage signals through a cable, next, performing voltage dividing again through a divider, then forming sampling signals by using a data collection card to perform sampling, and sending the sampling signals to an industrial control computer; and (3), the industrial control computer converting the sampling signals into voltages at the high-voltage side of the voltage transformer by use of an inversion calculating method combining time domain recursion convolution and a vector coupling method. By using the system provided by the invention, the cost is low, and the safety is high.

The invention relates to a coaxial capacitive divider for measuring a nanosecond high-voltage pulse, which belongs to the structural design of a divider for a high-voltage pulse device. The divider comprises high voltage electrodes, airproof rubber rings, a high-voltage seal cavity cap, insulating oil, a main insulated column, an intermediate electrode, a ground electrode, an external protective cover, an insulating ring and a low-voltage seal cavity cap and adopts the connection proposal that the high voltage electrodes are installed in the main insulated column by screw threads, the main insulated column is connected with the intermediate electrode by screw threads, the intermediate electrode is installed in the ground electrode by screw threads, the ground electrode is installed in the low-voltage seal cavity cap by screw threads, and the external protective cover is installed in the high-voltage seal cavity cap by screw threads. The invention has the advantages that as capacitors are distributed by the coaxial structure and are used as voltage division members, the electrical inductance of lead-in wires on both ends of one lumped parameter capacitor is reduced, and the electrical inductance of four lead-in wires of the two capacitors is reduced, thus the invention can increase the response frequency of the divider to a great extent.

The invention relates to the technical field of electrics, in particular to a high-insulativity, high-precision and environment-friendly capacitive divider. The embodiment of the invention provides a plurality of self-healing type high-voltage capacitors with inner series structures and an outer shell, wherein the self-healing type high-voltage capacitors with the inner series structures are arranged in the outer shell, and the outer shell is filled with nitrogen gas; the series approaches among the self-healing type high-voltage capacitors with the inner series structures are arrayed in the outer shell in a cosine curve law. The embodiment of the invention can reduce the local discharge among capacitors and can reduce the size of the high-voltage capacitive divider.