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6437 results about "Feedback circuits" patented technology

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System for providing actuated optimal inflation to multiple temperature regulated blankets and method therefor

InactiveUS7572285B2DiagnosticsSurgeryConvection heaterPressure sense

A convective warmer to which blankets of different dimensions may be connected is capable of providing air to the various blankets at flow rates that optimally inflate those blankets to achieve the optimal clinical result for the patients covered by those blankets. The blanket connected to the warmer may range from a full size adult warming blanket to a pediatric warming blanket. The convection warmer may have multiple fixed air flow rates each selectable by a user, via switch(es) either electronically or mechanically. For the electronic selection of a given flow rate, a motor adaptable to rotate a different speeds is used. To vary the flow rate mechanically, a valve is controlled to vary the amount of air that may pass to the blanket. Instead of different fixed flow rates, variable air flow rates, selectable by the user, may be used. Also, a feedback circuit that maintains the pressure sensed at the outlet of the warmer to a preset pressure may be used to eliminate the need for user intervention.

System for providing actuated optimal inflation to multiple temperature regulated blankets and method therefor

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Owner:SMITHS MEDICAL ASD INC

Electrosurgical system

ActiveUS20090248007A1Function increaseDiagnosticsSurgical instruments for heatingElectricityBipolar electrosurgery

An electrosurgical system can include an electrosurgical generator, a feedback circuit or controller, and an electrosurgical tool. The feedback circuit can provide an electrosurgery endpoint by determining the phase end point of a tissue to be treated. The electrosurgical system can include more than one electrosurgical tool for different electrosurgical operations and can include a variety of user interface features and audio / visual performance indicators. The electrosurgical system can also power conventional bipolar electrosurgical tools and direct current surgical appliances.

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Owner:APPL MEDICAL RESOURCES CORP

Overvoltage sensing and correction circuitry and method for low dropout voltage regulator

InactiveUS6201375B1Reduce severityEmergency protective arrangements for limiting excess voltage/currentArrangements responsive to excess voltageOvervoltageElectrical conductor

An LDO voltage regulator includes an error amplifier having a first input coupled to a first reference voltage, a second input receiving a feedback signal, and an output producing a first control signal. An output transistor has a gate, a drain coupled to an unregulated input voltage, and a source coupled to produce a regulated output voltage on an output conductor. A feedback circuit is coupled between the output conductor and a second reference voltage. An overvoltage comparator has a first input coupled to receive the first reference voltage and a second input coupled to respond to the feedback signal to produce a discharge control signal indicating occurrence of an output overvoltage of at least a predetermined magnitude to control a discharge transistor coupled between the output conductor and the second reference voltage. An output current sensing circuit produces a control current representative of the drain current of the output transistor. An offset capacitor is coupled between the output of the error amplifier and the gate of the output transistor, and a servo amplifier has a first input coupled to receive a third reference voltage, a second input coupled to the output of the error amplifier, and an output coupled to the gate of the output transistor to produce a second control signal thereon. A current sensor circuit, a current capacitor, and an AND circuit operate to allow the discharge transistor to be turned on only if the output current is below a certain level.

Overvoltage sensing and correction circuitry and method for low dropout voltage regulator

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Owner:BURR-BROWN CORPORATION

Method and apparatus for using optical feedback to detect fiber breakdown during surgical laser procedures

InactiveUS8638428B2Controlling energy of instrumentMaterial analysis by optical meansFiberFeedback circuits

Failure events detected by a laser surgery monitoring feedback circuit are analyzed in order to distinguish between events that result from fiber breakdown and those arising from other sources, such as burning of tissues. If the number of failure events within a predetermined time exceeds a predetermined count, then it is determined that the radiation is the result of fiber breakdown. If the number of failure events within the predetermined time is less than the predetermined count, then it is determined that the failure events result from other causes, such as heating of tissues by the laser. Based on the analysis, an override switch or alarm may be initiated.

Method and apparatus for using optical feedback to detect fiber breakdown during surgical laser procedures

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Owner:BROWN JOE DENTON

Control arrangement for a resonant mode power converter

InactiveUS20080198638A1Minimize such dead timeMinimize timeEfficient power electronics conversionDc-dc conversionCharge currentControl signal

The switching frequency of an LLC converter is controlled by a control unit to which a feedback circuit provides a first current dependent upon the output voltage of the converter. An oscillator circuit produces a sawtooth waveform at a frequency dependent upon the first current, up to a limit equal to a second current set by a resistor. Two complementary switch control signals are produced for controlling two switches of the converter for conduction in alternate cycles of the sawtooth waveform. A timer produces dead times between the two complementary switch control signals in dependence upon the second current. Another resistor provides a current constituting a minimum value of the first current, and a charging current of a capacitor in series with a resistor modifies the first current for soft starting of the converter.

Control arrangement for a resonant mode power converter

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Owner:POWER INTEGRATIONS INC

Voltage buck-boost switching regulator

ActiveUS8436592B2Stable, high-speed, high-efficiency constant-voltage output operationStop operationDc-dc conversionElectric variable regulationCapacitanceEngineering

A stable, high-speed, high-efficiency constant voltage is provided without a complicated, large-scale, high-cost phase compensation circuit over a wide range of operating conditions. This voltage buck-boost switching regulator consists of a pair of voltage reducing transistors, a pair of voltage boosting transistors, inductance coil, output capacitor and controller. The controller has the following parts for performing PWM control of constant voltage for voltage reducing transistors and voltage boosting transistors: an output voltage feedback circuit, an inductor current sense circuit, a variable sawtooth wave signal generator, switching controllers, and a voltage boosting driver.

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Owner:TEXAS INSTR INC

Continuously-tunable external cavity laser

InactiveUS6282215B1Laser optical resonator constructionSemiconductor laser arrangementsExternal cavity laserClosed loop feedback

The present invention provides a continuously-tunable external cavity laser (ECL) with a compact form factor and precise tuning. A novel interference filter which may be used to tune the ECL provides an absence of mode-hopping and reduced feedback from both spurious interference and reflections in the external cavity. A novel tuning mechanism is disclosed which provides for mechanical FM tuning of a wide range ECL tuning elements such as: an interference filter, a diffraction element, and a retroreflector. A novel feedback circuit is disclosed which provides closed loop feedback for selecting output wavelength in a laser.

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Owner:NEWPORT CORP

DC-AC converter, controller IC therefor, and electronic apparatus utilizing such DC-AC converter

ActiveUS7466566B2Conversion with intermediate conversion to dcEmergency protective circuit arrangementsTransformerFeedback circuits

An inverter has a semiconductor switch circuit provided in the primary circuit of a transformer. The switch circuit is controlled by a PWM circuit. The switch circuit is operated on the basis of an intermittent-operation signal having an ON state and OFF state to: set an error signal to a substantially zero level during OFF periods; gradually increase the error signal upon transition from an OFF state to an ON state; and gradually decrease the error signal upon transition from an ON state to an OFF state. Each ON phase of the intermittent operation is slowly started and slowly ended through charging and discharging of a capacitor provided in a feedback circuit. This enables concomitant application of constant-current control and intermittent-operation control to the inverter, which in turn provides a broad range of power that can be supplied to a load, significantly reduces hamming of the transformer, and prevents over-current from occurring in the inverter.

DC-AC converter, controller IC therefor, and electronic apparatus utilizing such DC-AC converter

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Owner:ROHM CO LTD

Predictive, adaptive power supply for an integrated circuit under test

InactiveUS6657455B2Suppress mutationReduce noiseDigital circuit testingSemiconductor/solid-state device testing/measurementPower flowFeedback circuits

A main power source supplies current through path impedance to a power terminal of an integrated circuit device under test (DUT). The DUT's demand for current at the power input terminal temporarily increases following edges of a clock signal applied to the DUT during a test as transistors within the IC switch in response to the clock signal edges. To limit variation (noise) in voltage at the power input terminal, an auxiliary power supply supplies an additional current pulse to the power input terminal to meet the increased demand during each cycle of the clock signal. The magnitude of the current pulse is a function of a predicted increase in current demand during that clock cycle, and of the magnitude of an adaption signal controlled by a feedback circuit provided to limit variation in voltage developed at the DUT's power input terminal.

Predictive, adaptive power supply for an integrated circuit under test

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Owner:FORMFACTOR INC

Power combining power supply system

ActiveUS7454238B2Reduce impactHigh bandwidthDc-dc conversionPower supply for data processingPower combinerLow speed

A power supply system comprises a low-speed power supply and a high-speed power supply configured to operate in first and second frequency ranges, respectively, and generate first and second outputs, respectively. The lower end of the second frequency range is at least higher than a lower end of the first frequency range. A frequency blocking power combiner circuit combines the power from the first output with the power from the second output to generate a combined, third output for driving a load, while providing frequency-selective isolation between the first and second outputs. A feedback circuit is coupled to receive the combined, third output through a global feedback loop. The feedback circuit generates first and second power supply control signals for controlling the low-speed power supply and the high-speed power supply, respectively, based on a difference between the third output and the predetermined control signal.

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Owner:QUANTANCE

Feedback circuit for line load compensation and reflection reduction

InactiveUS20070164779A1Reduce reflectionReliability increasing modificationsElectronic switchingElectrical resistance and conductanceCapacitance

Line load compensation and reflection reduction in a signal transmitting circuit is provided using feedback capacitors. The feedback capacitor serially coupled with a resistance generates an RC rise / fall time that is independent of the line load. Additionally, by selecting a capacitor that yields a rise / fall time of approximately ⅓ of the maximum bit transmission time, signal reflection on the signal line can be reduced. Accordingly, by incorporating the feedback capacitor with a differential drive circuit, such as the IB 485 driver, variations in line load can be compensated for while also reducing signal reflection due to un-terminated or improperly terminated signal lines, thus allowing a free topology implementation.

Feedback circuit for line load compensation and reflection reduction

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Owner:HONEYWELL INT INC

Feedback compensation detector for a direct conversion transmitter

ActiveUS6987954B2Resonant long antennasAmplifier modifications to reduce noise influenceFrequency changerIntermediate frequency

A feedback compensation detector for a direct conversion transmitter includes a baseband processor, a direct up-converter, an antenna, and an impairment detection and compensation feedback circuit. The baseband processor generates an in-phase (I) baseband signal and a quadrature-phase (Q) baseband signal. The direct up-converter is coupled to the baseband processor, and combines the I and Q baseband signals with an RF carrier signal to generate an RF output signal. The antenna is coupled to the direct up-converter, and transmits the RF output signal. The impairment detection and compensation feedback circuit is coupled to the RF output signal and the I and Q baseband signals. The impairment detection and compensation feedback circuit down-converts the RF output signal to generate an intermediate frequency (IF) signal, measures as least one signal impairment in the IF signal, and pre-distorts the I and Q baseband signals to compensate for the measured signal impairment.

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Owner:MALIKIE INNOVATIONS LTD

Primary-side controlled switching regulator

ActiveUS7352595B2Dc-dc conversionElectric variable regulationSwitching signalFeedback circuits

A switching regulator includes a switching device to switch a transformer from a primary-side to secondary side. A control circuit generates a switching signal for regulating output of the switching regulator. The control circuit includes a first circuit to generate a first signal and a timing signal by measuring a reflected signal of the transformer. A second circuit produces a second signal by integrating a current signal with the timing signal. The current signal represents a primary-side switching current of the transformer. A first feedback circuit produces a first feedback signal in response to the first signal and the reference signal, in which the reference signal is varied in response to the change of the second signal. Furthermore, a second feedback circuit generates a second feedback signal in response to the second signal. A switching control circuit generates the switching signal in response to the feedback signals.

Primary-side controlled switching regulator

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Owner:FAIRCHILD SEMICON CORP

Output voltage amplifier and driving device of liquid crystal display using the same

InactiveUS20100231577A1Accurate feedback voltageAvoid heatGated amplifiersCathode-ray tube indicatorsAudio power amplifierLiquid-crystal display

An output voltage amplifier, and a driving device of a liquid crystal display using the same are disclosed. The output voltage amplifier includes: an amplifying unit to generate first and second signals corresponding to a gray voltage input to a first input terminal and a feedback signal input to a second input terminal, and to output a first voltage by using first and second switches driven to be on or off according to the first and second signals; an output unit to apply the first and second data signals to the first and second pixels by using third and fourth switches turned on or off according to the first and second signals; and a feedback circuit unit to selectively supply one of the first voltage and the first and second data signals to the second input terminal. Heating characteristics and a slew rate can be improved.

Output voltage amplifier and driving device of liquid crystal display using the same

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Owner:MC TECH CO LTD

Power combining power supply system

ActiveUS20080104432A1Reduce the impactHigh bandwidthVolume/mass flow measurementDc-dc conversionLow speedPower combiner

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Owner:QUANTANCE

Transmitter system for wireless communication with implanted devices

ActiveUS7151914B2Low power operationCurrent consumptionResonant long antennasElectrotherapyMaximum levelFeedback circuits

A transmitter system for wireless communication with implanted medical devices includes a transmitter circuit having a resonant network the resonant frequency of which is adjusted by a feedback circuit in order to minimize the current drain from the power source and maximizing the power source life. The transmitter system may be powered by a power supply block which uses commonly available RS-232 signals of a host computer as a raw power source, combined with a high value storage capacitor to provide power for the wireless medical data programmer. A feedback circuit monitors the charging current as well as voltage impressed across the storage capacitor in order to maintain the charging current at maximum level during the charging time and in order to stop the charging once the full charge of the storage capacitor has been reached.

Transmitter system for wireless communication with implanted devices

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Owner:MEDTRONIC INC

LED device and LED driver

ActiveUS20090289559A1Guaranteed uptimePower consumption generated in the constant current driving circuit is suppressed or reducedStatic indicating devicesElectroluminescent light sourcesDc dc converterLed array

A LED device having a LED array, LED driver ICs, DC-DC converter, a first feedback circuit consisting of voltage dividing resistors, and a headroom voltage monitoring circuit having controller and second feedback circuit. In second feedback circuit, headroom voltages obtained at output current terminals of the LED driver ICs, are fed back to DC-DC converter.

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Owner:TEXAS INSTR INC

Hybrid charge pump regulation

ActiveUS20080024096A1Reliably and efficiently generatingReduce power consumptionStatic storageElectric variable regulationPower efficientFeedback circuits

Techniques for reliably and efficiently generating an output voltage for use within an electronic device, such as a memory system, are disclosed. A voltage generation circuit generates the output voltage. The voltage generation circuit includes regulation circuitry that controls regulation of the output voltage to maintain the output voltage at a substantially constant level. According to one aspect, regulation is provided through use of different feedback circuits. By selectively disabling one of the feedback circuits, power consumption can be reduced and the other of the feedback circuits can support the continued regulation of the output voltage. The voltage generation circuit is therefore able to operate in an accurate, stable and power efficient manner.

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Owner:SANDISK TECH LLC

Shorted lamp detection in backlight system

InactiveUS6870330B2Affect operationElectrical apparatusElectric light circuit arrangementCapacitive voltage dividerFeedback circuits

A power conversion circuit senses an output voltage to detect shorted lamp conditions in a backlight system. The power conversion circuit can drive at least one fluorescent lamp. A voltage sensing feedback circuit, such as a capacitive voltage divider or a resistive voltage divider, senses the output voltage at an output of the power conversion circuit and generates a voltage feedback signal for a shorted lamp detector. The shorted lamp detector reliably detects a shorted lamp condition of one fluorescent lamp in a multi-lamp configuration or detects a short circuit condition of the output voltage line coupling the output voltage of the power conversion circuit to the fluorescent lamps.

Shorted lamp detection in backlight system

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Owner:MICROSEMI

Hybrid charge pump regulation

ActiveUS7554311B2Reliably and efficiently generatingReduce power consumptionStatic storageElectric variable regulationPower efficientFeedback circuits

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Owner:SANDISK TECH LLC

Low voltage differential signal driver circuit and method

InactiveUS6900663B1Small RC-delaysSpeed maximizationTransmission line coupling arrangementsLogic circuit coupling/interface arrangementsDriver circuitElectronic load

Embodiments of the present invention relate to a low voltage differential signal driver (LVDS) circuit which comprises a current source, logic controlled switches for controlling the driver's output, an electronic load circuit coupled across the circuit, and a common-mode resistor feedback circuit coupled across the circuit, in parallel with the RC load, for tuning the driver's impedance. The driver is enabled to operate without op-amps and achieves optimum performance at 1.8 v supply voltages.

Low voltage differential signal driver circuit and method

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Owner:TAIWAN SEMICON MFG CO LTD

Voltage regulator that operates in either PWM or PFM mode

InactiveUSRE37609E1Improve efficiencyPower dissipationEfficient power electronics conversionApparatus without intermediate ac conversionVoltage regulationEngineering

A switching voltage regulator achieves high efficiency by automatically switching between a pulse frequency modulation (PFM) mode and a pulse-width modulation (PWM) mode. Switching between the modes of voltage regulation is accomplished by monitoring the output voltage and the output current, wherein the regulator operates in PFM mode at small output currents and in PWM mode at moderate to large output currents. PFM mode maintains a constant output voltage by forcing the switching device to skip cycles when the output voltage exceeds its nominal value. In PWM mode, a PWM signal having a variable duty cycle controls the switching device. A constant output voltage is maintained by feedback circuitry which alters the duty cycle of the PWM signal according to fluctuations in the output voltage.

Voltage regulator that operates in either PWM or PFM mode

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Owner:MICREL

Capacitive load driving circuit, droplet ejection device, droplet ejection unit and inkjet head driving circuit

InactiveUS20050231179A1Reduced stabilityOther printing apparatusAc network voltage adjustmentCapacitanceAudio power amplifier

A capacitive load driving circuit which includes an operational amplifier, a pulse width modulator, a digital power amplifier, a first filter, a first feedback circuit and a second feedback circuit. The operational amplifier outputs a differential signal between a signal fed back to the inverting input terminal and an input signal inputted to the non-inverting input terminal. The pulse width modulator pulse width-modulates output from the operational amplifier and outputs a digital signal. The digital power amplifier amplifies power of the digital signal. The first filter smooths output of the digital power amplifier and inputs the smoothed signal to the capacitive load as the driving signal. The first feedback circuit feeds back the driving signal outputted from the first filter to the inverting input terminal of the operational amplifier. The second feedback circuit feeds back a signal outputted from the digital power amplifier, which signal includes a phase which is advanced relative to the driving signal, to the inverting input terminal of the operational amplifier.

Capacitive load driving circuit, droplet ejection device, droplet ejection unit and inkjet head driving circuit

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Owner:FUJIFILM BUSINESS INNOVATION CORP

Mono-polarity switchable PCMO resistor trimmer

ActiveUS20060017488A1Improve the immunityPulse automatic controlSolid-state devicesElectrical resistance and conductanceAmorphous silicon

Using programmable resistance material for a matching resistor, a resistor trimming circuit is designed to reversibly trim a matching resistor to match a reference resistor. The programmable resistance materials such as metal-amorphous silicon metal materials, phase change materials or perovskite materials are typically used in resistive memory devices and have the ability to change the resistance reversibly and repeatable with applied electrical pulses. The present invention reversible resistor trimming circuit comprises a resistance bridge network of a matching resistor and a reference resistor to provide inputs to a comparator circuit which generates a comparing signal indicative of the resistance difference. This comparing signal can be used to control a feedback circuit to provide appropriate electrical pulses to the matching resistor to modify the resistance of the matching resistor to match that of the reference resistor.

Mono-polarity switchable PCMO resistor trimmer

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Owner:XENOGENIC DEV LLC

System and method for driving light-emitting diodes (LEDs)

ActiveUS20070035538A1Minimum heat dissipationEfficient power supplyElectrical apparatusElectroluminescent light sourcesSwitched currentControl signal

System and method for improving efficiency in driving LEDs. A preferred embodiment comprises a switch current regulator coupled to a current control signal input, the switch current regulator to control an amount of current provided to the LED based upon a magnitude of a voltage on the current control signal input, a switching voltage regulator coupled to the switch current regulator and the LED, the switching voltage regulator to provide current to the LED, and a sensor coupled to the switch current regulator, the LED, and a signal feedback circuit, the sensor to measure status information regarding the switch current regulator and the LED and provides the information to a controller, wherein the status information can be used to adjust the current on the current control signal input.

System and method for driving light-emitting diodes (LEDs)

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Owner:TEXAS INSTR INC

Method and apparatus for providing feedback of vocal quality to a user

ActiveUS8019050B2Interconnection arrangementsSpeech analysisGraphicsEnvironmental noise

Embodiments of the invention relate to a feedback mechanism that informs a user of a communication device to adjust the volume, pitch, tone or other characteristic of his voice so as to compensate for noise in the surrounding environment. The feedback mechanism includes feedback circuitry that analyzes audio signals from the microphone and preferably from one or more additional environmental noise sensors. From the analysis, the feedback circuitry determines characteristics of the user's voice and characteristics of the environmental noise, and provides an analysis of how the user might modify his voice to best compensate for environmental noise. This analysis results in an indication to the user, such as through a vibration, a sound, or graphical indication on the device, which tells the user whether and to what extent the user should adjust a characteristic of his voice to best overcome such environmental noise.

Method and apparatus for providing feedback of vocal quality to a user

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Owner:MOTOROLA SOLUTIONS INC

Method and apparatus for sensing flash memory using delta sigma modulation

ActiveUS20060250853A1Accurate inductionHigh circuitryRead-only memoriesDigital storageConvertersAverage current

A simple method and device for accurately measuring flash memory cell current. The sensing scheme comprises an integrator, an analog to digital converter, and a digital to analog converter. The method comprises the acts of applying an input current and a feedback output current to a summer, integrating the resulting summer output over time, passing the integrated output to a clocked comparator, outputting a comparator output which controls a feedback circuit that keeps the integrator's voltage at the same level as a reference voltage, and outputting a digital average current to a counter. Delta sigma modulation (averaging) is employed to cancel out noise that would otherwise affect the cell current measurement.

Method and apparatus for sensing flash memory using delta sigma modulation

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Owner:MICRON TECH INC

Switched capacitor circuit with reduced common-mode variations

ActiveUS20050134380A1Amplifier modifications to raise efficiencyDifferential amplifiersEngineeringImpedance matching

A circuit with a common-mode dual output includes a feedback circuit connected to alternate the states of the dual output between an average output level and a desired common-mode level. The difference between the average and desired levels is proportional to a signal offset level. An impedance matching circuit is connected to the feedback circuit to adjust the signal offset level.

Switched capacitor circuit with reduced common-mode variations

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Owner:ANALOG DEVICES INC

Capacitive load driving circuit, droplet ejection device, droplet ejection unit and inkjet head driving circuit

InactiveUS7244007B2Reduced stabilityDc network circuit arrangementsOther printing apparatusAudio power amplifierDifferential signaling

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Owner:FUJIFILM BUSINESS INNOVATION CORP

Drop volume measurement and control for ink jet printing

InactiveUS7121642B2Other printing apparatusRelative VolumeEngineering

A system and method is presented for measuring the volume of an ink-jet droplet or the relative volumes of a plurality of ink-jet droplets using their electrical properties. In a preferred embodiment a single small capacitor or an array of capacitors is used to measure the dielectric properties of ink-jet droplets and the absolute drop volumes are derived. In an alternative preferred embodiment the relative differences in drop volumes are determined. A feedback circuit, such as one using lock-in technique, may be used to automatically adjust subsequent drop volumes.

Drop volume measurement and control for ink jet printing

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Owner:DOLYA HOLDCO 5 LTD

6437 results about "Feedback circuits" patented technology

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