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326 results about "Automatic power control" patented technology
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Automatic Power Control Circuit. A Circuit that controls the operation of a Laser Diode to ensure constant power. The Output Power of a laser diode decreases as Ambient Temperature rises and vice versa.
Automatic control system for an electrosurgical generator
An automatic control system for an electrosurgical generator is herein disclosed. The automatic control system includes voltage and current sensing circuits, a processing circuit, an output determining circuit, and a control circuit. Samples of the voltage and current outputs are supplied to the processing circuit and the output determining circuit to generate an output signal. The output signal is compared to a reference signal to generate a feedback signal for controlling a drive circuit.
Owner:COVIDIEN AG
Wireless headset with automatic power control
InactiveUS7010332B1Life maximizationMinimize power consumptionPower managementNear-field transmissionAutomatic controlProximity sensor
A wireless headset for use with a separate communications device, such as a cellular telephone, includes automatic on / off capabilities to maximize battery life. By detecting a user's interaction, such as picking up the headset or placing it upon the user's body, the wireless headset automatically transitions from an inactive state to an active state. Techniques for automatic headset enabling include but are not limited to motion sensors, attitude or position sensors, proximity sensors, and contact sensors. These techniques may be used individually or in any combination. An internal timer allows the wireless headset to return to its inactive state a defined interval after cessation of movement or removal of the wireless headset. Including an optional sleep state further optimizes battery life. In the sleep state, only a portion of the wireless headset circuitry is enabled. Rather than transitioning from inactive to active, the headset transitions from inactive to sleep. In sleep, the headset periodically monitors for a signal from the separate communications device. Upon detection of such a signal, the wireless headset transitions to its active state, thereby providing full functionality to the user.
Owner:UNWIRED PLANET
Full-automatic cementing complete set control method
InactiveCN110159225ARaise the advanced levelSolve labor shortageSealing/packingTotal factory controlAutomatic controlControl system
The invention discloses a full-automatic cementing complete set control method, and relates to the related technical field of petroleum equipment. The method comprises the steps of intelligent full-automatic cementing key control, matching control, an automatic power control system, a slurry mixing control system, an automatic premixing function, automatic liquid level control, automatic manifoldcontrol, a hydraulic pneumatic control system, a lime supply automatic control system, a chemical additive automatic control system, a water supply automatic control system and a well control device automatic control system. According to the operating method, intelligent full-automatic control over cementing operation is achieved, and breakthrough of the automatic manifold control technology is achieved successfully; through the lime supply automatic control technology and the full-automatic control technology, the advanced level of equipment and technologies of the company is improved greatly; a new mode of future cementing operation is created, and a new era of a smart oil field is started; through achievement of the intelligent full-automatic cementing operation technology, the problems, that customers face at present, of shortage of labor forces and labor resources can be solved; and the intelligent operation is achieved.
Owner:YANTAI JEREH PETROLEUM EQUIP & TECH CO LTD
Radio frequency modulation of variable degree and automatic power control using external photodiode sensor for low-noise lasers of various wavelengths
ActiveUS20060215716A1Increase output powerWide wavelength rangeLaser detailsSemiconductor laser optical deviceLow noiseRadio frequency
A low-noise laser diode module comprises a laser diode for emitting light with a wavelength in the range from UV to IR, a drive circuit for injecting electrical current into said diode, and an automatic power control circuit for monitoring and adjusting laser output power using front-facet photodiode external to the laser assembly and a feedback loop. Said drive circuit produces injection current modulated by an RF signal with variable degrees, depending on the wavelength to be stabilized, the desired spectral bandwidths of the laser output, and / or other applications. Said RF signal can be a sine wave, a distorted sine wave, a rectified sine wave, a non-sine wave, a series of narrow pulses, or repetitive shunt. The present invention encompasses a method for producing stable, broadband, and low-coherent laser. The present invention also encompasses a method for producing stable narrowband or single longitudinal mode laser. The present invention further encompasses a compact light source applicable to DPSS lasers, fiber lasers, optical parametric oscillators, low-speckle laser display systems, and seeders, with or without nonlinear frequency conversion processes.
Owner:PAVILION INTEGRATION
Communication apparatus
InactiveUS20050245213A1Automatic controlImprove the level ofResonant long antennasGain controlWireless transmissionMode control
In a communication apparatus, effective automatic power control (APC) is realized. Transmission object signal level changing units change a level of a transmission object signal of each channel, and transmission filter units carry out filtering for a signal of each channel after its level was changed with a characteristic for allowing a passage of a frequency component of each channel, and a transmission signal coupling unit couples signals of plural channels after the filtering was carried out, and an antenna transmits a coupled signal by wireless, and coupled signal dividing units divide a part of the coupled signal into a plurality of signals, and level detection filter units carry out filtering for each divided signal with an identical characteristic to the above-described characteristic, and signal level detecting units detect a level of a signal of each channel after the filtering was carried out, and a transmission object signal level change mode controlling unit controls a level change mode of a transmission object signal of each channel on the basis of the detection result.
Owner:KOKUSA ELECTRIC CO LTD
Automatic control of a medical device
InactiveCN101119680AEasy to operateReduce accumulationX-ray apparatusRadiation diagnosticsAutomatic controlEye tracking system
An eye tracking system determines the true gazing direction of operator of medical device relative to a monitor, while passing radiations through the body of the patient (4). An evaluation device evaluates the determined gazing direction of the operator (10). The activation or deactivation of a pedal or switch (3) is controlled automatically corresponding to the evaluation device output. An independent claim is included for the method of automatic control radiation source.
Owner:KONINKLIJKE PHILIPS ELECTRONICS NV
Automatic Control of a Medical Device
InactiveUS20080253519A1Improve securitySolve the poor convenience of useLocal control/monitoringMedical equipmentAutomatic controlBiological activation
System and method for automatic control of processes or application, such as the activation or deactivation of a radiation source for medical purposes. The system comprises an operator tracking system arranged to determine the gesture / posture of a user, an evaluation device arranged to evaluate the determined gesture / posture, and an enabling device arranged to enable and disable the radiation source in response to an output of the evaluation device. The operator tracking system may use a gazing direction analysis that may be based on the output of an eye tracking system, or an emitter-receiver arrangement for a directed signal.
Owner:KONINKLIJKE PHILIPS ELECTRONICS NV
Wavelength and Intensity Stabilized Laser Diode and Application of Same to Pumping Solid-State Lasers
ActiveUS20090097507A1Avoid excessive perturbationLaser using scattering effectsActive medium shape and constructionLow noisePeak value
An efficient and low-noise solid-state laser is optically pumped by one or more laser diode(s) driven by RF modulated current. The solid-state laser operation is stabilized by the pump source stable in both spectrum and intensity, in conjunction with automatic power control wherein the feedback loop accurately reflects the true drift in the output power. Moreover, the pump efficiency is optimized and the optical noise is minimized by adjusting the diode operation temperature such that the pump wavelength coincides with the absorption peak of the gain medium. By internally or externally modulating the amplitude of the drive current, the pump diode(s) operate in pulsed mode with controllable shape, width, repetition rate, and pulse-to-pulse intervals, which enables essentially constant optical energy produced from each pulse of the solid-state laser in high repetition rates with variable pulse-to-pulse intervals.
Owner:PAVILION INTEGRATION
Small Form Pluggable Analog Optical Transmitter
ActiveUS20080101801A1Easily remove and swapCost effectiveLaser detailsOptical multiplexSmall form factorEngineering
A pluggable small form factor optical transmitter is described. The optical transmitter can be plugged into an optical transmission unit which may hold many optical transmitters. The optical transmitter includes an analog laser for QAM transmissions, a TEC driver, pre-distortion circuitry, a microprocessor, and an automatic power control circuit and dither tone level control capability. The optical transmitter may have receptacle optical ports such as LC or SC type, also it may include a pin connector for mating with the optical transmission unit and a latch mechanism to secure the optical transmitter in the optical transmission unit.
Owner:ARRIS ENTERPRISES LLC
System for regulating optical output power
Systems and methods for regulating optical power are described. A system for regulating optical power includes a laser driver circuit that receives an enable / disable signal and a data modulator input. The enable / disable signal regulates asynchronous mode operation. The system also includes a laser module including a laser diode emitter and a photodiode detector. The laser module is coupled to the laser driver circuit and receives a laser bias current from the laser driver circuit. The system also includes a switch coupled to the photodiode to receive a signal from the photodiode detector. The system also includes an automatic power control (APC) feedback circuit that receives a signal from the switch and provides a laser bias current feedback signal to the laser driver circuit to compensate for power output changes in the laser diode emitter over time.
Owner:NETWORK APPLIANCE INC
Superhigh frequency rediofrequency identical label reader
InactiveCN1815487AHigh sensitivitySafe and reliable workModulated-carrier systemsSensing record carriersAutomatic controlLow-pass filter
The disclosed reader is composed of antenna, directional coupler, logarithmic amplifier, two pieces of A / D converter, digital signal processor, power amplifier, frequency synthesizer, and serial interface etc. using orthogonal non coherent demodulation technique, the reader receives and detects data information (amplitude modulation or phase modulation) carried by backscattering electromagnetic wave of ID label in radio frequency. Thus, the invention omits complex phase-lock circuit of local oscillation of receiver as well as realizes higher sensitivity of receiver, and longer distance for reading card. Using directional coupler and logarithmic amplifier, the power amplifier carries out automatic power control. Comparing with traditional ID label reader in UHF, the disclosed reader possesses advantages of simple structure, stable performance, and low price.
Owner:ZHEJIANG UNIV
Automatic control of laser diode current and optical power output
An automatic power control system provides a control signal that regulates the output power of at least one laser diode. Coarse adjustment of the control signal is provided by a first means, preferably a digital variable resistor, while fine adjustment and compensation is provided by a second means, preferably by a digital-to-analog converter that receives an input signal proportional to a sensed control system parameter. The control system includes an operational amplifier having a first input coupled to sense output power, and a second input coupled to a DAC to provide finer resolution control. Memory can store system parameter or system parameter variations that can be coupled to the DAC and / or variable resistor to enhance system stability over ambient variations.
Owner:STRATOS INT +1
Combined open and closed loop power control with differential measurement
A power control system and method for a wireless telephone employs an open loop technique for relatively low power levels and a closed loop technique at higher power levels. In the open loop technique, a wireless telephone (104, 106, 108) stores a phasing table of automatic power control (APC) values for the power levels (which are used to control upconverter gain levels measured at different channels. In operation, a power controller (322) reads the power level and reads the APC value in the table. Another table stores the APC value for one power level as the channel and temperature are varied. This value is interpolated, as needed, during operation. The APC value for the open loop approach is determined by reading the input channel; finding the closest higher and closest lower channels in the temperature-channel table; interpolating between APC values for the temperature column of the closest lower temperature, to get the actual value. The difference between this value and the APC value for the actual power level in the phasing table is then obtained.
Owner:SIEMENS AG
Automatic power and temp. controller for pumping laser
InactiveCN1694321AAchieve temperature controlReduce power consumptionTemperatue controlSemiconductor lasersTemperature controlAutomatic control
This invention relates to a power and temperature automatic control device of a pump laser including an automatic power control circuit and an automatic temperature control circuit, the two of which apply a pulse-width modulation way to drive the pump laser and a freezer separately so as to realize automatic temperature and power controls of the pump laser, which reduces the power loss and volume of its controller greatly. The device is controlled by a single-chip processor, which sets and fetches various parameters.
Owner:SHANGHAI UNIV +1
Apparatus and method for automatic power control
InactiveUS20050025018A1Stable controlLow costCombination recordingTelevision system detailsLow speedEngineering
An apparatus and method for automatic power control is disclosed. An optical recording apparatus utilizes a low-speed, peak-hold circuit to obtain and output a maximum of a front photodiode output signal during a predetermined window or plurality of windows of a total duration long enough to allow maximum peak-hold signal to stabilize. After stabilization, the maximum peak-hold signal is sampled and held in a sample and hold circuit. A reset then clears the signal and reinitializes the peak-hold circuit. In accordance with the difference between a reference voltageand the held peak-hold signal, a feedback controller unit outputs the required current level into a driving unit for producing desired recording pulses into a laser diode for recording information pits into an optical disc. A calibration gain may be used when, due to insufficient FPD response speed, the held signal is different than the real optical power output.
Owner:VOLVO LASTVAGNAR AB +1
Debugging method for average light power and extinction ratio parameter of light transmitter
InactiveCN101483481AReduce investmentReduce manufacturing costElectromagnetic transmissionExtinctionTransmitter
The present invention discloses a method for debugging the average optical power and extinction ratio parameter of optical transmitter. The optical transmitter is set to an automatic power control mode. The modulation signal coupling mode of the laser driving chip of light transmitter and the laser is set to a direct-current coupling mode. A microcomputer tests the luminous efficiency and threshold current of laser of the optical transmitter. The microcomputer debugs the average optical power of optical transmitter to a preset average optical power area. The microcomputer debugs the present extinction ratio of optical transmitter to a preset extinction range. The technical scheme according to the invention can greatly reduce the investment of product line on the device and has the advantages of automatic debugging realization, reduced production cost and increased production efficiency.
Owner:CHENGDU SUPERXON COMM TECH CO LTD
Method for modeling automatic power generating control model in power system simulation
ActiveCN102957144ASuitable for the whole process simulation requirementsSingle network parallel feeding arrangementsPower system simulationReliability engineering
The invention discloses a method for modeling an automatic power generating control model in power system stimulation, which models an automatic power generating control system by considering the control mode and the control performance evaluation standards in the automatic power generating control and the algorithm characteristics of power system stimulation. Meanwhile the invention discloses a method for implementing an automatic power control model in power system stimulation. The model can stimulate the three modes of constant-frequency control, constant-exchange power control and tie-line power and frequency deviation control in automatic power generating control, and simultaneously achieves the three control performance evaluation standards of A1 / A2, CPS1 / CPS2 and T of automatic power generating control; regions adopt different control strategies according to different region control performance evaluation standards, so that the model can analyze the influence of automatic power generating control in the long-term dynamic stimulation in a power system, and the requirement of the simulation of of the whole process of electromechanical transient and electromechanical medium and long-term dynamic state of the power system are met.
Owner:CHINA ELECTRIC POWER RES INST +1
Laser diode device
ActiveUS20050105572A1Broaden applicationMinimized in sizeSemiconductor laser structural detailsSolid-state devicesExternal circuitMetal
A laser diode device of package not greater than 5.6 mm, having an automatic power control circuit directly mounted in a heat sink (or a submount) inside the metal cap thereof to substitute for an external circuit board for driving by voltage instead of current.
Owner:ARIMA LASERS CORP
Calibration method of time division-synchronization code division multiple access (TD-SCDMA) terminal
InactiveCN102088321AImprove utilization efficiencyReduce the number of output changesSubstation equipmentTransmission monitoringSpectrographAutomatic frequency control
The invention discloses a calibration method of a time division-synchronization code division multiple access (TD-SCDMA) terminal, which increases terminal calibration speed and enhances terminal calibration accuracy. The technical scheme comprises three aspects, namely automatic frequency control calibration, automatic gain control calibration and automatic power control calibration, wherein the automatic frequency control calibration comprises the following steps of: under the fixed input signal power of a signal source, changing a control word; demodulating to acquire data of a plurality of frames; calculating frequency information; and performing linear variation to acquire a step change value and an automatic frequency control initial value; the automatic gain control calibration comprise the following steps of: under the fixed input signal power of the signal source, changing the control word to acquire a plurality of groups of receiving signal intensity values, a gain value of a fixed gain module and a gain slope of a variable gain module; calculating input signal power and a gain value and combining automatic gain calibration tables; and the automatic power control calibration comprises the following steps of: transmitting a power list by gradually increasing or decreasing control words at a fixed periodic interval by using the terminal; acquiring data by using a frequency spectrograph; and selecting a power value and a control word.
Owner:SPREADTRUM COMM (SHANGHAI) CO LTD
Wavelength and intensity stabilized laser diode and application of same to pumping solid-state lasers
ActiveUS7606273B2Easy to controlImprove modulationLaser using scattering effectsSemiconductor lasersLow noiseFrequency spectrum
An efficient and low-noise solid-state laser is optically pumped by one or more laser diode(s) driven by RF modulated current. The solid-state laser operation is stabilized by the pump source stable in both spectrum and intensity, in conjunction with automatic power control wherein the feedback loop accurately reflects the true drift in the output power. Moreover, the pump efficiency is optimized and the optical noise is minimized by adjusting the diode operation temperature such that the pump wavelength coincides with the absorption peak of the gain medium. By internally or externally modulating the amplitude of the drive current, the pump diode(s) operate in pulsed mode with controllable shape, width, repetition rate, and pulse-to-pulse intervals, which enables essentially constant optical energy produced from each pulse of the solid-state laser in high repetition rates with variable pulse-to-pulse intervals.
Owner:PAVILION INTEGRATION
Method for implementing power detection based automatic power control in optical network
ActiveCN1665175AImprove adaptabilityMeet the needs of transmissionElectromagnetic transmissionAutomatic controlSystem maintenance
The invention relates to a method for implementing automatic power control based on power detection in an optical network. It monitors and regulates the power of all the corresponding nodes in a power control link according to the standard power value provided by the given reference standard, so as to meet the transmitting needs of the optical network and can implement full auto power control on the condition without any artificial interference. Therefore, it can make the power control link in the optical network possess a better self-adapting ability and maintain stable transmitting property in the allowable power change range of the system. It can clearly grasp the power condition of each node in the whole power control link and is convenient for system maintenance and trouble clearing.
Owner:HUAWEI TECH CO LTD
Surface emitting laser device with monolithically integrated monitor photodetector
InactiveUS6535538B1Evaluate effectEffectively cutting offLaser active region structureActive medium materialPhotovoltaic detectorsPhotodetector
Disclosed is a surface emitting laser device with a monolithically integrated monitor photodetector, which is combined with an automatic power control circuit, thereby being capable of more accurately controlling the surface emitting laser output power. A method is also disclosed, which is adapted to fabricate the surface emitting laser device. In accordance with, the present invention, the surface emitting laser device includes insulating layers each sandwiched between an intrinsic semiconductor layer and a doped semiconductor layer in a monitor photodetector adapted to partially absorb light emitted from a surface emitting laser, thereby outputting a detect signal for the light. The insulating layers serve to remove photocurrent resulting from spontaneous emission light emitted from the surface emitting laser. By this configuration, it is possible to accurately control the power of light emitted from the surface emitting laser through a laser window.
Owner:KOREA ADVANCED INST OF SCI & TECH
Control method and control circuit for laser diode, and optical transmitter using the same
InactiveUS20050286575A1Easy to adjustInhibit deteriorationLaser detailsSemiconductor lasersAutomatic controlAmplitude control
A control method for a laser diode is conducted such that optical output and OMA (optical modulation amplitude) or extinction ratio of the laser diode are controlled while modulating the optical output of the laser diode by applying a bias current and a modulation current to the laser diode. The method has: a first step of measuring the optical output of the laser diode; a second step of measuring a slope efficiency or a corresponding value of the slope efficiency while conducting APC (automatic power control) to adjust the bias current such that the optical output coincides with a predetermined value; and a third step of adjusting the modulation current by AAC (automatic amplitude control) according to the slope efficiency or the corresponding value of the slope efficiency such that the OMA or extinction ratio coincides with a predetermined value.
Owner:APRESIA SYST LTD
Automatic power control liquid particle counter with flow and bubble detection systems
ActiveUS10371620B2Improve data qualityReduce in quantityGas dispersion analysisElectrical apparatusElectromagnetic radiationData quality
Owner:PARTICLE MEASURING SYST
Low cost VSAT MMIC transceiver with automatic power control
InactiveUS7076201B2Low costReduced functionalityResonant long antennasBroadcast transmission systemsMicrocontrollerAutomatic control
A very small aperture terminal (VSAT) transceiver of a VSAT terminal has a ceramic substrate board with transmitter, receiver and local oscillator circuits, including microwave monolithic integrated circuit (MMIC) chips positioned on the ceramic substrate board. A microcontroller is operative with the MMIC chips and an indoor unit of the VSAT terminal for controlling transceiver gain and output power. The microcontroller monitors one or both of the received signal strength of a signal received from a satellite in communication therewith and the signal-to-noise information from the indoor unit. The transceiver gain and output power is controlled by the microcontroller based on the received signal strength and / or the signal-to-noise information from the indoor unit.
Owner:REVEAL IMAGING
Radio frequency modulation of variable degree and automatic power control using external photodiode sensor for low-noise lasers of various wavelengths
ActiveUS7468998B2Laser detailsSemiconductor laser optical deviceAutomatic controlAutomatic gain control
Owner:PAVILION INTEGRATION CORP
Output power control method of burst mode laser driver
InactiveCN102624458ARealize automatic controlLow costElectromagnetic transmissionMicrocontrollerAutomatic control
The invention provides an automatic output power control method of a burst mode laser driver and a specific implementation mode for realizing the method. The method comprises the following steps of: additionally arranging a peak value extraction circuit, a valley value extraction circuit and a mean value extraction circuit in a burst mode laser driver system; converting a burst-mode light power monitoring current signal into a voltage signal by utilizing a transconductance amplifier, respectively extracting the peak value, valley value and mean value of the voltage signal, maintaining, and periodically resetting and updating; converting the peak value, the valley value and the mean value of the voltage signal into corresponding numerical values by utilizing a low-cost analog-to-digital conversion circuit; subtracting the numerical value of the valley value from the numerical value of the peak value by utilizing a microcontroller and comparing an obtained difference value with a preset reference value; comparing the numerical value of the light power mean value with a preset reference value; and according to comparative results, respectively regulating the control voltages of the modulation circuit and bias circuit of the laser driver by utilizing a digital-to analog conversion circuit, so as to realize automatic power control and achieve the optimized extinction ratio.
Owner:SOUTHEAST UNIV
Semiconductor laser module, method for stabilizing and denoising semiconductor laser, and solid laser
InactiveCN102013630AIncrease randomnessCancel noiseLaser detailsSemiconductor lasersBeam splitterPhotodiode
The invention provides a semiconductor laser module. The semiconductor laser module comprises a semiconductor laser, a drive circuit driving the semiconductor laser, an automatic power control assembly and an optical element which shapes laser emitted by the semiconductor laser, wherein the automatic power control assembly consists of a photodiode, a beam splitter independently arranged in a closed box, a current amplifier, a comparer and a reference signal generator; a feedback signal generated by the photodiode is input to the comparer through the current amplifier, and is compared with a preset reference signal; and direct current bias is adjusted according to the comparison result. The improved automatic power control assembly truly reflects fluctuation of laser output, and improves the effect of automatic power control.
Owner:PAVILION INTEGRATION CORP SUZHOU
Laser diode controller and method for controlling laser diode by automatic power control circuit
This invention provides an automatic power control (APC) circuit for keeping an extinction ratio constant even when the efficiency of a laser diode (LD) deteriorates. The APC circuit according to this invention stores first control data for deciding the relationship between a bias current Ib and a modulation current Im so that the extinction ratio under a certain target power is a predetermined value. A central processing unit (CPU) decides the bias current Ib and modulation current Im on the basis of a current optical output power and the first control data and supplies them to an LD driver. The APC circuit also stores second control data for deciding the correction value for the optical output power corresponding to the temperature of the LD. The CPU acquires the current temperature before deciding the bias current Ib, decides a correction value corresponding to the current temperature according to the second control data, and corrects the target power. Thereafter, the CPU computes the bias current Ib on the basis of the corrected target power.
Owner:SUMITOMO ELECTRIC IND LTD
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