3946 results about "Bridge circuit" patented technology

An ultrasonic surgical apparatus and method, the apparatus including a signal generator outputting a drive signal having a frequency, an oscillating structure, receiving the drive signal and oscillating at the frequency of the drive signal, and a bridge circuit, detecting the mechanical motion of the oscillating structure and outputting a signal representative of the mechanical motion. The ultrasonic surgical apparatus also includes a microcontroller receiving the signal output by the bridge circuit, the microcontroller determining an instantaneous frequency at which the oscillating structure is oscillating based on the received signal, and determining a frequency adjustment necessary to maintain the oscillating structure oscillating at its resonance frequency, the microcontroller further determining the quality (Q value) of the signal received from the bridge circuit and determining material type contacting the oscillating structure.

A serial ATA disk drive having a parallel ATA test interface is disclosed. A bridge circuit has a serial ATA port that is coupled to a serial ATA interface for receiving and transmitting serial ATA data signals, a parallel ATA port for receiving and transmitting parallel ATA signals, and a disable input for selectably disabling the parallel ATA port. The bridge circuit performs signal conversions between the ports. The test interface is for coupling the disk drive to a disk-drive test system. The test interface includes a connector having contacts for parallel ATA signals, and having a contact for a disable signal coupled to the disable input. The connector may be a pad pattern on a printed circuit of the disk drive. The disk drive may have an industry standard form factor, and the connector may be configured such that it lies within the disk drive's form factor.

An ultrasonic surgical apparatus and method of use including a signal generator outputting a drive signal having a frequency, an oscillating structure, receiving the drive signal and oscillating at the frequency of the drive signal, a bridge circuit, detecting the mechanical motion of the oscillating structure and outputting a signal representative of the mechanical motion, and a microcontroller receiving the signal output by the bridge circuit, the microcontroller determining an instantaneous frequency at which the oscillating structure is oscillating based on the received signal, and comparing the instantaneous frequency to a known frequency value and estimating a temperature of the oscillating structure based on the comparison.

An electric power steering apparatus can improve heat dissipation of a power board. A heat sink is mounted on the power board in surface contact therewith, on which power board there is mounted a bridge circuit including a plurality of semiconductor switching elements for switching an electric current supplied to an electric motor in accordance with torque assisting a steering wheel. The heat sink has a plurality of protrusions formed on a surface thereof at a side opposite to the power board.

The present invention is system and method for holding voice chat over a telephone network. An embodiment for implementing the invention can comprise the following steps. First, a caller accesses the chat service by dialing a telephone number that is associated with the service of the present invention. Second, the caller is routed to a conference bridge circuit. Third, the subscriber enters a public chat room. Fourth, the subscriber participates in the public chat room that he or she had entered. While in the public chat room, the subscriber hears the voices of other chatters in the public chat room, and those chatters hear the subscriber's voice when the subscriber speaks. Fifth, at anytime, the subscriber may leave the public chat room by pressing an appropriate key on the keypad. In the preferred embodiment, two or more chatters may request to be placed in a private chat room for a private discussion that is not heard by other chatters of the public chat room.

An ultrasonic surgical apparatus including a first signal generator outputting a drive signal at a predetermined voltage and frequency, a first oscillating structure receiving the drive signal and oscillating at the frequency of the drive signal, and a bridge circuit, detecting the mechanical motion of the first oscillating structure and outputting a signal representative of the mechanical motion. The apparatus also includes a second oscillating structure integrally formed within a portion of the first oscillating structure, the second oscillating structure outputting an electrical signal, and a microcontroller receiving the signal output by the bridge circuit and output by the second oscillating structure, the microcontroller determining an instantaneous frequency at which the first oscillating structure is oscillating based on the received signal, comparing the electrical signal from the second oscillating structure with a known signal value and determining the temperature of the second oscillating structure based on a the comparison.

A reference voltage generating circuit is constituted by resistors RE and RF each having a resistance not influenced by an application of pressure. The reference voltage generating circuit is connected between one and the other ends of a bridge circuit. A failure judgement of the bridge circuit is performed based on a comparison of a voltage difference VBC between two midpoints B and C of the bridge circuit and voltage differences VCE and VBE between a reference voltage level of the reference voltage generating circuit and the voltage levels of two midpoints B and C.

A capacitive sensing circuit may comprise an RC (resistive-capacitive) bridge circuit, with a switching signal simultaneously applied to a reference path, and a signal path comprising the capacitance to be detected. Small perturbations in the capacitance may be detected by mixing / correlating a difference signal representative of the difference between the reference path signal and the signal path signal, to the switching signal. The output of the mixer may be filtered to virtually eliminate all EMI signals. A narrowband approach may also allow filtering of unwanted signals, enabling operation in systems susceptible to high levels of noise. Frequency stepping of the switching signal may minimize inband signal interference, and allow operation in the presence of many signals that would otherwise result in failure of the sensing circuit. Pad calibration may be implemented to free the user from a need to characterize each button channel capacitance and tailor the operation for each channel.

An external defibrillator with an output circuit having four legs arrayed in the form of an “H” (an “H-bridge”) is disclosed. The output circuit is designed to be able to conduct a range of defibrillation pulse energies, from below 50 joules to above 200 joules. Each leg of the output circuit contains a solid-state switch. By selectively switching on pairs of switches in the H-bridge, a biphasic defibrillation pulse may be applied to a patient. The switches in three of the legs of the H-bridge output circuit are preferably SCR switches, while the fourth leg includes an IGBT switch. In one embodiment, a single power switch is utilized in each of the legs of the H-bridge output circuit, and are included in a single integrated module or package. The use of single semiconductor switches in an integrated surface mountable module or package simplifies the assembly and manufacturing of the defibrillator device. The use of a single IGBT in a leg of the H-bridge (as opposed to two or more IGBTs in series) also greatly simplifies the drive circuitry required to turn on and off the IGBT.

The embodiment of the invention discloses a GOA circuit for LCD. The GOA circuit comprises a plurality of cascaded GOA units. According to the nth-level GOA unit control, the nth-level horizontal scanning line of a display area is charged. The nth-level GOA unit comprises a pull-up circuit, a pull-down circuit, a first pull-down holding circuit, a second pull-down holding circuit, a bridge circuit, a pull-up control circuit, a downlink circuit and a bootstrap capacitor, wherein a third TFT in the pull-down holding circuit is connected with a seventh TFT in parallel; a tenth TFT in the second pull-down holding circuit is connected with a fourteenth TFT in parallel; the seventh TFT and the grid electrode of the fourteenth TFT are connected to each other and respectively connected with a start signal from the (n-1)-level GOA unit or the (n-1)-level horizontal scanning line. The embodiment of the invention further discloses an LCD device. By the implementation of the GOA circuit and the LCD device, an output delay of a grid signal can be shortened.

An illumination apparatus is configured simply in a reduced scale while a light emitting diode is used as a light emitting source for illumination. The illumination apparatus includes an LED driving block including an LED bridge circuit formed from a bridge connection of a plurality of diode series circuits each of which is formed from a series connection of a plurality of light emitting diodes and a rectifying diode. A load resistor is connected to a rectification output of the LED bridge circuit. When an AC voltage is input to the LED driving block, the LED bridge circuit rectifies the AC voltage, and the resulting rectification current is used as driving current to drive the light emitting diodes to emit light.

A method for powering a pitch motor drive system for at least one DC pitch motor of a wind turbine includes rectifying a voltage using a bridge circuit to thereby supply a DC link voltage to a bridge comprising active switching devices, and utilizing at least one link capacitor to smooth the DC link voltage and act as an energy sink and source for the DC pitch motor or motors.

A temperature information detecting device for an angle sensor is provided for detecting only temperature-dependent components based on middle-point potentials when a constant current is supplied to a bridge circuit for an angle sensor, for acquiring a temperature of the angle sensor from the temperature-dependent components, for employing compensating information corresponding to the acquired temperature without separately providing any additional temperature sensor, and for making temperature compensation of the output of the temperature sensor in automatically controlling the valve opening of a flow control valve.

A power supply includes a direct converter provided in the form of a two-phase or three-phase bridge circuit. The bridge branche of the direct converter includes a serial connection of any number of identical two-terminal networks, each having the following characteristics: The two-terminal networks each have at least one switching state, in which their terminal voltage takes on positive values independent of the magnitude and polarity of the terminal current; the two-terminal networks each have at least one switching state, in which their terminal voltage takes on negative values independent of the magnitude and polarity of the terminal current; the two-terminal networks have at least one internal energy store.

An LLC series resonant converter and a driving method for the synchronous rectification power switches thereof are provided. The LLC series resonant converter includes a bridge circuit, a resonant network, a transformer, a rectification circuit, and a frequency adjustment controller. The bridge circuit includes at least one pair of power switches. The power switches drive the resonant network. The rectification circuit includes at least one pair of synchronous rectification power switches. The synchronous rectification power switches and the power switches have a mapping relation between them. The frequency adjustment controller provides driving signals to the synchronous rectification power switches in response to the operating frequency of the LLC series resonant converter and the series resonant frequency of the resonant network, to implement synchronous rectification in the LLC series resonant converter.

The present invention relates to a self-repairing type grid drive circuit. The self-sepairing type grid drive circuit includes a plurality of cascaded GOA units, wherein the n-th stage GOA unit comprises a pull-up control circuit (100), a pull-up circuit (200), a download circuit (300), a pull-down circuit (400), a bootstrap capacitor (500), a first pull-down holding circuit (600), a second pull-down holding circuit (700), and a bridge circuit (800). The bridge circuit (800) comprises a first thin film transistor (T55), wherein a grid electrode is connected to the grid signal point (Q (N)), a drain electrode and a source electrode are respectively connected to a first circuit point (K (N)) and a second circuit point (P (N)). When operating, the first circuit point (K (N)) and the second circuit point (P (N)) are alternately arrange on a high potential. The self-repairing type grid drive circuit of the present invention can reduce the failure risk of the pull-down holding circuit caused by a long time operation of production process or GOA circuit, thereby realizing the self-repairing function of the circuit.

A magnetic sensor includes magnetoresistive elements and a soft magnetic body. The magnetoresistive elements have multi layers including a magnetic layer and a nonmagnetic layer on a substrate, and exert a magnetoresistance effect. The soft magnetic body is electrically disconnected with the magnetoresistive elements, and converts a vertical magnetic field component from the outside into a magnetic field component in a horizontal direction so as to provide the magnetoresistive elements with the horizontally converted magnetic field component. The magnetoresistive elements have a pinned magnetic layer having a fixed magnetization direction and a free magnetic layer having a variable magnetization direction. The free magnetic layer is stacked on the pinned magnetic layer with a nonmagnetic layer interposed between the free magnetic layer and the pinned magnetic layer. The magnetization directions of the pinned magnetic layers of the magnetoresistive elements are the same direction. The magnetoresistive elements form a bridge circuit.

An alternating current light-emitting device includes a substrate, a plurality of microdie light-emitting elements formed on the substrate, a rectifying element-dedicated member formed on a surface of a portion of microdie light-emitting elements, a rectifying unit formed on the rectifying element-dedicated member and provided with at least four rectifying elements forming a Wheatstone bridge circuit, and an electrically conductive structure electrically connecting the rectifying elements and the microdie light-emitting elements. With the rectifying unit being formed on the rectifying element-dedicated member, the rectifying elements are highly tolerant of reverse bias and feature low starting forward bias. Also, the present invention provides a method for fabricating an alternating current light-emitting device.

A power supply includes a direct converter provided in the form of a two-phase or three-phase bridge circuit. The bridge branche of the direct converter includes a serial connection of any number of identical two-terminal networks, each having the following characteristics: The two-terminal networks each have at least one switching state, in which their terminal voltage takes on positive values independent of the magnitude and polarity of the terminal current; the two-terminal networks each have at least one switching state, in which their terminal voltage takes on negative values independent of the magnitude and polarity of the terminal current; the two-terminal networks have at least one internal energy store.

A highly accurate displacement sensor using GMR elements for detecting a displacement of a physical quantity such as angle is to be provided wherein a waveform distortion of output voltage is diminished.There are installed at least two Wheatstone bridge circuits having a predetermined angular offset and each comprising a plurality of GMR elements, the GMR elements each having a fixed magnetic layer set to a predetermined magnetization direction. An AC power supply is use as a power supply of the Wheatstone bridge circuits and a displacement of a physical quantity such as a rotational angle is detected on the basis of AC-modulated outputs from the Wheatstone bridge circuits.An anisotropic self-bias effect of a free magnetic layer in each GMR element can be diminished and hence it is possible to remedy a waveform distortion of an output signal based on the anisotropic self-bias effect of the free magnetic layer.

A rotary type component force measuring device capable of finding a highly accurate component force is provided. This measuring device has a rotary type component force detector comprising in integrated manner, a rim mounting frame, a hub mounting frame, a second sensing beam of a character I shaped sectional type which couples and the mounting frames, and a first sensing beam which couples the second sensing beam and the mounting frame, wherein each of front and back surfaces of receiving sensor portions adhere with each of orthogonal shearing type strain gauges A1 to H4, and a signal is derived from the strain gauges A1 to H4 by a bridge circuit for each receiving sensor portion, and the output signals from the bridge circuit are sampled by an electronic circuit disposed on the inside of a rotating unit according to the timing signal from an angle detection signal, and the output signals are transmitted to a signal processing unit disposed on the outside of the rotating unit by non-contact data transmission method, and the output signals are corrected by correction information for every rotation angle position of the detector storing the output signals beforehand, and are subjected to coordinate conversion so as to calculate the six component forces for every angle rotation.

An electric power converter includes a capacitor, a bridge circuit that includes a plurality of switching elements, a transformer, a secondary side rectifier circuit, a smoothing circuit, a detector that detects a value based on at least one of a capacitor voltage and a current flowing from the capacitor, and a control device that outputs a primary side drive signal to turns on / off each of the plurality of switching elements at a switching frequency, the control device increasing the switching frequency when the detected value increases, the control device reducing the switching frequency when the detected value decreases.

A temperature control device of an optical semiconductor device is provided for keeping the optical semiconductor device constant. An optical semiconductor device is fixed to a thermal conductor. One thermistor is arranged on the thermal conductor at the portion where it is susceptible stronger to an ambient temperature rather than the optical semiconductor device is susceptible to the ambient temperature while another thermistor is arranged on the thermal conductor at the portion where it is susceptible weaker to the ambient temperature rather than the optical semiconductor device is susceptible to the ambient temperature. The difference between an average temperature of the thermal conductor at two points detected by the thermistors and a set temperature is detected by a temperature detecting means comprising a bridge circuit having the thermistors which are connected to each other so as to form opposing sides of the bridge circuit and a differential amplifier for receiving an imbalanced voltage of the bridge circuit. The thus detected difference of the temperature is outputted to a temperature control circuit, whereby the temperature control circuit controls a Peltier driving current of a Peltier element so that the average temperature of the thermal conductor at two points thereof and the set temperature become equal to each other.

The purpose of this invention is to sense the presence of a seated occupant in a vehicle such as an automobile, plane, train or bus, or in a room or location where it is desirable to detect if seats are occupied. The occupant presence detection device consists of a single seat-mounted electrode, an oscillator circuit, a bridge circuit, a detection circuit and a circuit for processing the detected signals. The oscillator circuit excites the electrode. If an occupant is present on the seat, additional capacitance from the human body is introduced into the bridge via the electrode. This created differences in the voltage and phase of the waveform in each arm of the bridge circuit which are amplified by a differential amplifier. The signal is then converted to a DC voltage that, when above a predetermined threshold, causes the device to outputs a signal that indicates the presence of an occupant. Using a bridge configuration and a differential amplifier allows the circuit to be operated over a wide range of supply voltages. It also reduces the need for high precision components and the need to regulate the amplitude of the waveform produced by the oscillator. The net result is a capacitive occupant sensing device that is less complex and less expensive that previous capacitive occupant sensing devices, yet is tolerant of power supply fluctuations, is able to function over a wide range of operating voltage and still provides failsafe functionality.

A computer system includes a first processor integrated circuit. A first bridge integrated circuit is coupled to the processor via a host bus. The computer system includes an interconnection bus that couples the first bridge circuit to a second bridge circuit. The interconnection bus provides a first transfer mode for asynchronous data and a second transfer mode for isochronous data. The interconnection bus provides for a maximum latency and a guaranteed throughput for asynchronous and isochronous data.

The invention relates to a breaker of a direct current system, in particular to a semi-controlled active injection current high voltage direct current breaker and a realization method thereof. The breaker comprises a high speed switch-thyristor module branch, as well as a lightning arrester branch and a bridge circuit which are connected in parallel with the branch, wherein a capacitor-reactor series branch and a resistor-thyristor series branch are connected in parallel and then connected with middle points of two bridge arms of the bridge circuit; and the two ends of a capacitor are connected in parallel with a charging loop. The breaker is based on a direct current breaking principle by the traditional active injection current manner; semi-controlled power electronic devices are added; a high speed mechanical switch is adopted; the advantage of low loss during normal breakover is kept; and bidirectional current can be broken quickly without an arc. The breaker is simple in circuit topological structure, simple and convenient to control, mature in technology, easy to realize, great in current breaking capability, high in withstand voltage level and strong in expansion capability, and the cost is lowered greatly since the number of the adopted power electronic devices is small.

A DC / AC converter is disclosed having two DC voltage connections (1,2), between which are provided in a parallel circuit configuration, an intermediate energy storage (C1) and a bridge circuit providing at least two parallel branches, each branch providing two in-series-connected switch units (A,B and C,D), to each of which a rectifier diode (DA,DB,DC DD) is connected in parallel, and having at least two AC connections, of which each single AC connection is connected via a connecting line, in each of which an inductor (L1 respectively L2) is provided, to one of the parallel branches of the bridge circuit between two the switch units (A,B respectively C,D) via one connecting node. In at least two connecting lines, two separate electrical connecting paths are provided, in each of which a switch (E respectively F) and an in-series-switched rectifier diode (DE respectively DF) are provided. The rectifier diodes (DE,DF) in the single connecting paths are switched in an opposite conducting direction.

An aerosol delivery device is provided that includes a substrate configured to carry an aerosol precursor composition, and a resonant transformer including a transmitter coupling device and a resonant receiver coupling device that is positioned in proximity to the substrate. The aerosol delivery device also includes a pulse width modulation (PWM) inverter configured to drive the resonant transformer. The PWM inverter includes a bridge circuit coupled to the transmitter coupling device, and a PWM controller embodied as an integrated circuit and configured to output a PWM signal to the bridge circuit configured to drive the transmitter coupling device to generate an oscillating magnetic field and induce an alternating voltage in the resonant receiver coupling device when exposed to the oscillating magnetic field. The alternating voltage causes the resonant receiver coupling device to generate heat and thereby vaporize components of the aerosol precursor composition.