244 results about "Floating ground" patented technology

A wireless device having an improved antenna system is disclosed comprising one or more antenna, preferably circularly polarized antenna, for transmitting or receiving a signal, and one or more floating ground planes, wherein the floating ground plane preferably is electrically isolated from and in sufficient proximity to the antenna so that it is inductively coupled to the antenna. The floating ground plane may comprise one or more of a strip, band, foil, plate, block, wire mesh, sheet or coating of conductive material and, for example, may be a relatively thin copper strip, band, foil or coating. The circularly polarized antenna, preferably comprises a flat planar shaped radiating element sized and configured to resonate at a predetermined, desired frequency, frequencies or band of frequencies, and a flat planar shaped antenna ground, both radiating element and antenna ground formed on the same printed circuit board. The radiating element is electrically isolated from the antenna ground but sufficiently close to resonate at the desired frequencies. Preferably the floating ground plane is larger than or more massive than the antenna ground, and preferably larger than or more massive than the radiating element. In a further embodiment the wireless device comprises a housing for interfacing with a user, the housing comprising a conductive contact exposed to the exterior of the housing and configured to be contacted by a user, wherein the conductive contact is electrically connected to the floating ground plane, preferably so that the user is coupled to the antenna and becomes part of the antenna system. The floating ground plane may also preferably be configured to substantially cover or overlap the antenna, and may also be configured to distribute and propagate the electromagnetic signals away from the head of the user.

An antenna system is assembled to a dielectric medium on a vehicle and is spaced from an electrically conductive member so as to allow for enhanced antenna performance. The dielectric medium has first and second surfaces and a dielectric thickness between the first and second surfaces. An antenna is mounted to the first surface of the dielectric medium for receiving and/or transmitting signals. An electrically conductive member is mounted to the second surface of the dielectric medium for providing a floating ground that forms a capacitive coupling with the antenna. The electrically conductive member is dielectrically isolated from vehicle electrical ground.

In accordance with a preferred embodiment of the invention, reader antennas are provided within storage fixtures for transporting RF signals between, for example, an RFID reader and an RFID tag. In a preferred embodiment, the RFID-enabled storage fixtures are implemented using an intelligent network, which may allow enhanced flexibility in controlling systems for interrogation of RFID antennas.

The invention provides an LED (Light Emitting Diode) driving circuit and a constant-current control circuit thereof. The constant-current control circuit comprises an error amplifier, a turn-on time control module and a driving signal generation module, wherein the first input end of the error amplifier receives load current through a sampling port and the second input end of the error amplifier receives preset first reference voltage; the input end of the turn-on time control module is connected with the output end of the error amplifier; and the driving signal generation module generates a driving signal for turning off a switching tube in the LED driving circuit according to the output signal of the turn-on time control module, the driving signal is output through a driving port, a ground port is configured to receive floating ground voltage and the floating ground voltage is different from the reference ground voltage of the input voltage of the LED driving circuit. The constant-current control circuit has the advantages that the precise constant-current control can be realized, the power coefficient is high, the input harmonic is low, the working safety is high and the conversion efficiency is high.

The present invention includes compositions and methods of creating electrical isolation and ground plane structures, around electronic devices (inductors, antenna, resistors, capacitors, transmission lines and transformers) in photo definable glass ceramic substrates in order to prevent parasitic electronic signals, RF signals, differential voltage build up and floating grounds from disrupting and degrading the performance of isolated electronic devices by the fabrication of electrical isolation and ground plane structures on a photo-definable glass substrate.

Various methods, apparatuses, and systems are described in which a volatile memory that includes a plurality of volatile memory cells as well as a voltage limiting component and a current limiting component. Power consumption in a standby mode is controlled. The voltage limiting component and the current limiting component couple between the volatile memory cells and the ground voltage potential. One or more rows of memory cells in the memory array are isolated from the ground voltage potential to control power consumption in the standby mode by having the current limiting component stop passing current in the standby mode. A floating ground voltage potential sensed by each memory cell when in the standby mode is controlled by configuring the voltage limiting component to conduct when the floating ground voltage potential is larger than a threshold voltage of the voltage limiting component in order to reduce leakage current but reliably maintain the stored contents of the volatile memory cell. The floating ground voltage potential is internally raised higher than a voltage biasing the bulk of the transistors in the volatile memory cells by coupling the floating ground voltage potential to the voltage limiting component.

An electronic circuit includes a driver for an LED light, having an isolated DC-DC converter having a first output at a higher voltage referred to a floating ground and a second output at a lower voltage than said first output and referred to a reference voltage. A DC-DC boost converter receives its input power from the second output of the isolated DC-DC converter and having its output coupled to the floating ground, whereby an output voltage to a LED light receives the sum of the voltages of the first output of the isolated DC-DC converter and the output of the DC-DC boost converter.

The invention relates to a high speed switching tube floating grid driving circuit, aiming at solving the technological problem of the existing switching tube floating grid driving circuit that duty ratio is limited, and the like. In the invention, the source electrode of MOSFET or the emitter of IGBT is taken as a floating ground, a driving signal is processed to be the driving signal based on the floating ground by high-speed optical coupling; a high frequency transformer driven by a switching signal provides a floating power supply and supplies power to a rising edge regulating and signal amplifying circuit by a rectification filter circuit, and also supplies power to an optical coupling circuit by a voltage stabilizing circuit. The rising edge regulating and signal amplifying circuit can output a floating driving signal based on the floating ground and with adjustable rising edge speed. The invention realizes the floating grid driving circuit, the duty ratio of which can reach 100 percent for a long term, the switching tube driving signal rising speed is adjustable inside the driving circuit, voltage difference between the signal ground and the floating ground of the floating grid driving circuit can be improved to 2500V, and the circuit has low cost and is convenient for wide application.

To pass an ultrahigh speed differential signal and sufficiently attenuate a common mode signal on an ultrahigh speed differential transmission line. A pair of conductor lines 1A and 1B are formed on one side of a dielectric layer 3 in parallel to each other. A floating ground 5 is formed on the other side of the dielectric layer 3 so as to face the conductor lines 1A and 1B. The floating ground 5 is not connected to an external common ground 7 and is formed independently. A passive two terminal circuit CM1 composed of passive circuit elements is connected between a connection point 9 between the floating ground 5 and a common ground 7.

To sufficiently attenuate a common mode signal by passing an ultra-high speed differential signal through an ultra-high speed differential transmission line. A common mode filter comprises: a pair of conductive lines formed on a first dielectric layer to transmit a differential signal; a plurality of first divided floating grounds in a state of being separated from an external ground potential, and facing the conductive lines, with the first dielectric layer interposed between them, and formed by being divided into a plurality of numbers in a length direction of the conductive lines, and forming a distribution constant type differential transmission line for the differential signal, together with the conductive lines; and a first passive two-terminal network connected between the first divided floating grounds located at least at an input side or an output side of the first divided floating grounds, and the external ground potential.

An apparatus for non-destructively measuring gas compositions in insulated glazing units has an integrated structure that houses circuitry to generate a localized high voltage discharge utilizing a floating ground plane. The localized high voltage discharge is discharged via an integrally arranged discharge head such that an optical emission from an insulated glazing unit in response to the localized high voltage discharge is sampled and analyzed by components housed by the structure

The invention discloses an output-floating input-parallel high-gain Boost converting circuit and a switching method thereof and belongs to the field of power electronics. The output-floating input-parallel high-gain Boost converting circuit consists of an input portion, a power conversion portion and a load portion, wherein the power conversion portion can be divided into a first module and a second module which are in structural symmetry. A converter comprises a coupling inductor M1 with two windings L11 and L12, a coupling inductor M2 with two windings L21 and L22, two power switching tubes S1 and S2, two clamping diodes DCC1 and DCC2, two clamping capacitors CC1 and CC2, two output diodes DC1 and DC2 and two output capacitors C1 and C2. On the basis of the output-floating input-parallel high-gain Boost converting circuit, the boost characteristic of the coupling inductors is combined with series-connection boost effects of the output capacitors. The output-floating input-parallel high-gain Boost converting circuit and the switching method thereof have the advantages that the problem that a traditional Boost circuit is limited in voltage gain is solved, the converting circuit is easily to be expanded into multiple phases, and input current ripples can be reduced effectively through application of an interleaving switch-on technology to the switching tubes in the two modules.

The invention relates to a half-bridge drive circuit comprising a half-bridge circuit, a driver and a bootstrap capacitor charging circuit, wherein the half-bridge circuit is connected between a power supply VBAT (Voltage of Battery) and a power ground GND (Ground); a signal input end of the driver is connected with an external control unit; a high-side driving signal output end, a high-side driving floating ground end, a low-side driving signal output end and a low-side driving ground end on a driver are connected with the half-bridge circuit; and the bootstrap capacitor charging circuit is simultaneously connected with a high-side driving floating power supply end and the high-side driving floating ground end on the driver, and the bootstrap capacitor charging circuit and the driver share low-voltage input. The half-bridge drive circuit is characterized by further comprising a charging pump circuit which is used for maintaining the voltages on two ends of a charging capacitor C1 when a low-voltage input end cannot charge the charging capacitor C1 through a diode D1 in the bootstrap capacitor charging circuit, the charging pump circuit is connected with the high-side driving floating power supply end and the high-side driving floating ground end on the driver, and the ground of the charging pump circuit is connected with the power ground of the half-bridge circuit. The half-bridge drive circuit has the adaptability to a wide working condition range and is suitable for driving various half-bridge circuits in the technical field of power electronics.

The invention discloses a railway power regulator based on a half-bridge structure, which comprises two single-phase step-down transformers and a half-bridge inversion module, wherein the half-bridge inversion module comprises a pair of switch arms and a pair of series capacitors, and the switch arms are connected into a back-to-back structure by two capacitors; and the primary sides of the two single-phase step-down transformers are connected with power supply arms at the two secondary sides of a traction transformer, ungrounded lines at the secondary sides of the two single-phase step-down transformers are respectively connected with the switch arms in the half-bridge inversion module by an inductor, and the two single-phase step-down transformers are grounded and are connected with the middle points of the two capacitors in the half-bridge inversion module. Compared with a structure adopting two H-bridge single-phase converters, the cost of the active capacity of the railway power regulator is lowered by one time. Under the precondition that the same function is finished, the cost and the complexity of hardware are decreased, and the reliability of a compensation device is enhanced, so that the invention is greatly beneficial to the high-power modularization of the device and has favorable application prospect.

An antenna and an electronic device having the same is provided. The antenna includes a substrate including a ground portion, an external metallic frame of the electronic device, a float ground portion arranged to be connected to the external metallic frame in a state of being disconnected from the substrate, and at least one radiator electrically connected to the float ground portion. Upon being fed with power, the at least one radiator may operate as an antenna radiator, or a section of the external metallic frame may operate as the antenna radiator.

A method and apparatus for regulating a non-isolated high voltage converter applies a PWM signal to a power transistor that couples an input voltage to a floating ground node to charge an inductor and generate an output voltage which is measured with a first floating comparator to disable the PWM signal upon detecting a high threshold output voltage, the first floating comparator having inputs connected across first and second resistive elements to measure a voltage across a feedback resistor connected in series with a diode between the output voltage and a neutral ground reference. Subsequently, the output voltage is measured with a second floating comparator to enable the PWM signal upon detecting a low threshold output voltage, where the second floating comparator has inputs connected across the first and second resistive elements to measure the feedback voltage across the feedback resistor.

The invention relates to a four-terminal-method high-value capacitor impedance measuring device and a measuring method thereof. The measuring device includes an inductive shunt, a capacitance box, a standard resistor, a resistance box, a capacitor to be measured, a digital voltmeter and a power supply; the inductive shunt includes a pair of windings with a turns ratio of 1 to 1; the capacitance box and the standard resistor are connected in series to form a measuring loop A; the resistance box and the capacitor to be measured are connected in series to form a measuring loop B; the pair of windings of the inductive shunt are reversely connected to the two measuring loops; and the standard resistor and the capacitor to be measured are connected by adopting a four terminal method. By adjusting impedance balance, the measuring method enables current vales in the two measuring loops to be equal, and a series connection equivalent capacitance value and a loss factor of the capacitor to be measured are obtained through a discrete Fourier transformation method and synchronous sampling technology. The four-terminal-method high-value capacitor impedance measuring device and the measuring method thereof in the invention realize isolation measurement and floating-ground measurement, interference of the power supply to the measuring device can be eliminated, and a calibration result can be prevented from being affected by electric current, thereby greatly improving accuracy of capacitance measurement.

Methods and systems are described for efficiently detecting an object. The system includes at least one electrode for measuring a displacement current. The at least one electrode is coupled to a floating ground configuration provided by an op-amp, where the inverting node of the op-amp is coupled to electrode and the non-inverting node is coupled to a signal generator. The system may include a single capacitance sensor for detecting an object. Systems may include a plurality of capacitance sensors in an array configuration for detecting an object.

Memory devices and methods of operating a memory cell are disclosed in which a bitline can be grounded after charge sharing with an electrically floating ground line and before writing data to the memory cell. An electric potential of an upper power supply node of a memory cell can be lowered and an electric potential of a lower power supply node of the memory cell can be raised before writing data to the memory cell.

The invention relates to a switch power supply which can filter the industrial frequency noise of floating system, wherein based on traditional switch power supply, the invention eliminate the Y capacitor, to realize pure coil induction couple between the first coil and the secondary coil of transformer, to eliminate the transmission path of industrial frequency noise at the alternative current end to the secondary end; each rectify diode of rectify bridge is parallel connected to one capacitor, to reduce the aberration of alternative signal generated at the start and end of diode. With said invention, the industrial frequency noise of floating system can be filtered, to confirm the electromagnetic test of switch power meets the EMC standard.