409 results about "Power correction" patented technology

Circuits, systems, methods and software for controlling a power conversion and / or correcting and / or controlling a power factor in such conversion(s). The present invention generally takes a computational approach to reducing or minimizing zero current periods in the critical mode of power converter operation, and advantageously reduces zero current periods in the critical mode of power converter operation, thereby maximizing the power factor of the power converter in the critical mode and reducing noise that may be injected back into AC power lines. The present power factor controller allows for greater design flexibility, reduced design complexity, and reduced resolution and greater tolerance for error in certain parameter measurements useful in power factor correction and / or control.

The present invention relates to an uplink power control method and user equipment, which involve determining a power correction factor by considering the number of antenna ports. According to the present invention, even when a base station transmits the same power control information to the user equipment, the user equipment maps the power control information to another power correction factor and determines an uplink transmission power depending on an uplink transmission condition. Thus, uplink power control can be performed in a more efficient manner.

A multifocal contact lens includes a first, central zone for distance and intermediate vision and a second, outer zone for near vision. The first and second zones are conic sections joined tangentially at their junction. The power in the distance subregion is relatively constant, while the power throughout the intermediate subregion is a monotonically increasing function which reaches the near power correction at the junction. The second zone includes an aspheric surface having an eccentricity calculated to minimize or eliminate spherical aberration. The slope or power gradient in the intermediate subregion is calculated to provide a smooth transition from the lower power distance subregion to the junction between the intermediate subregion and the near power correction zone.

The invention relates to a power control method of a battery management system. The power control method includes the following steps: establishing a two-dimensional power list of temperature and SOC (state of charge); detecting current temperature and an SOC value, looking up the list and estimating a current maximum allowable discharging power value according to a linear interpolation method; performing self-adaptive power correction; if abnormity of the system is detected, finding out related parameter values of abnormity of the system, and setting maximum allowable target discharging power at the time according to the related parameter values; smoothing the power value; transmitting the set maximum allowable target discharging power to a whole vehicle controller, and performing corresponding control by the whole vehicle controller. Compared with the prior art, the power control method has the advantages that the method can automatically adapt to environment and changing of circumstances of declination of actual battery capacity or increase of internal battery resistance and the like to correct allowable power values, and flexibility is high; smoothing is adopted, so that abrupt changing of the power value can be effectively prevented, influence caused by abrupt changing can be reduced, and comfortableness in the process of driving can be improved.

A method for testing a radio frequency (RF) receiver as a device under test (DUT) with one or more test instruments to provide a plurality of relative power correction factors, a plurality of received signal strength indication (RSSI) calibration factors, or both.

A device for power factor correction in a forced switching power supply unit is provided. The device includes a converter and a control device coupled to the converter so as to obtain from an input alternating mains voltage a direct regulated voltage on the output terminal. The converter includes a power transistor, and the control device includes an error amplifier having its inverting terminal coupled to a first signal that is proportional to the regulated voltage and its non-inverting terminal coupled to a reference voltage. A drive circuit of the power transistor is coupled to the output terminal of the error amplifier. The control device also includes a circuit for generating a current signal that is representative of the effective input voltage. The current signal is coupled to the inverting terminal of the error amplifier to vary the regulated voltage in reply to variations in the effective input voltage.

A method and apparatus for uplink power alignment estimation in a communication system includes a step 600 of defining an upper threshold and a lower threshold for a transmit power correction (TPC) level. A next step 602 includes keeping a total of accumulated TPC commands. A next step 604 includes determining that a power correction is needed. A next step 608 includes generating a TPC command to be sent to a user equipment per the needed power correction. A next step 610 includes adjusting the total according to one of the following conditions: if the total is between the upper and lower thresholds then the total is changed per the needed power correction, if the total is at either of the thresholds and the needed power correction would not exceed either of the thresholds then the total is changed per the needed power correction, and if the total is at either of the thresholds and the needed power correction would exceed either of the thresholds then total is kept the same.

A display monitor power supply circuit has a primary side with a power factor correction circuit, a secondary side with a microcontroller for controlling a display monitor, and an isolation interface arranged between the primary side and the secondary side. The microcontroller provides a power correction circuit control signal to the power factor correction circuit for controlling a power correction factor of the display monitor power supply circuit. In operation, the power correction circuit control signal automatically switches the power factor correction circuit to an off state during a power save state. The isolation interface may also provide a supply voltage directly to the power factor correction circuit. The isolation interface may include an isolator circuit for two-way communication signals between the primary side and the microcontroller to fully control the power factor correction circuit.

Circuits and devices are described that provide power to appliances and other devices via a power correction circuit and an LLC converter, which may for example include resonant series converters and flyback converters. The circuits and devices economize on board space, part size and power start up time by separately powering up the controller circuit portion prior to powering up the LLC converter.

The invention discloses a non-bridge APFC active factor power correction circuit which comprises an AC positive half cycle APFC circuit, an AC negative half cycle APFC circuit, and an AC filter circuit, wherein the AC positive half cycle APFC circuit comprises a first inductor, a first switch tube, a positive half cycle first diode, a positive half cycle second diode, a first capacitor, a first PFC controller and a first DC-DC converter as a load, and the AC negative half cycle APFC circuit comprises a second inductor, a second switch tube, a negative half cycle first diode, a negative half cycle second diode, a second inductor, a second PFC controller and a second DC-DC converter as a load. Compared with conventional non-bridge APFC circuit, the non-bridge APFC active factor power correction circuit has lower loss, and smaller electromagnetic interference.

According to an exemplary embodiment, a transmitter system includes a power amplifier receiving a supply voltage and a supply current from a power control / current detection circuit, where the power amplifier drives a load impedance. The transmitter system further includes a power correction module configured to sample the supply current and to cause a change in a control voltage, which corrects the supply voltage in response to a change in the load impedance. The supply voltage is corrected to cause the power amplifier to have a substantially constant output power. The power correction module is further configured to output a corrected peak voltage determined by an average value of the supply current. The transmitter system further includes a predistortion module configured to determine the control voltage from a product of the corrected peak voltage and an amplitude modulation component and to output the control voltage to the power control / current detection circuit.

A power correction value generating unit determines a power correction value for minimizing an error, from a reference output power value of a carrier multiplexed signal, generating due to peak power suppression under a carrier setting based on the carrier setting relating to either one or both of the number of carrier signals and frequency arrangement, and peak suppression setting. An output power error correcting unit corrects a signal gain before or after the carrier signals are multiplexed, using the power correction value obtained by the power correction value generating unit. In an apparatus performing peak suppression according to an input limitation power of the power amplifier, it is possible to always obtain a desirable transmission (output) power even when the number of carriers or carrier frequency arrangement varies.

The invention relates to the technical field of automobiles, in particular to a fuel cell electric automobile power optimization method. The method includes the following steps that step 1: automobile use power is calculated; step 2: the power is calculated according to the state of a SOC; step 3: power correction is conducted; and step 4: power output is conducted. According to the fuel cell electric automobile power optimization method, automobile energy use efficiency can be improved, automobile economy is improved, and the principle of energy distribution is optimized, so that endurance mileage is improved, and the automobile energy use efficiency can be improved, the automobile economy is improved, and the principle of the energy distribution is optimized, so that the endurance mileage is improved.

This invention relates to a power correction method including a step of off-line calibration: setting a sender at the off-line calibration mode controlling the sender to emit a specific carrier signal, measuring and storing IF spot power compensating value and / or RF spots power compensation value corresponding to different IF and / or RF spots of the carrier, an on-line compensation step: setting said sender at normal operation mode to take out the stored related power compensating values of IF spots and / or RF spots to compensate the output power of said carrier, which can compensate the power difference resulted by IF spots of multiple carriers to reduce requirement on IF filter pass-band flatness of IF filter.

The invention discloses an overload steam supplementing throttling steam distribution steam turbine flow characteristic test method. The method comprises the following steps: under the condition that initial parameters are certain and an overlapping degree of a regulating valve is removed, carrying out a steam turbine flow characteristic test; simultaneously combining a Friuli Greig formula of a second stage of a high pressure cylinder with a heat exchange formula of a number one high-pressure heater, and constructing a steam inlet flow mathematics representation equation of a steam turbine set; obtaining a zero-overlapping steam distribution function by performing direct value mapping and power correction of overload steam supplementing valve position instructions through "steam turbine steam inlet flow-main regulating valve position instructions and the overload steam supplementing valve position instructions" at a zero-overlapping state; and through a dual means of setting "a valve regulating openness amplitude limit under amplification of each unit of steam inlet flow instructions" and value quantification of "the influence degree of main adjusting valve throttling loss on heat consumption of the steam turbine set", refinement setting on the overlapping degree of the regulating valve is carried out, accordingly, an overlapping degree steam distribution function according with a steam turbine actual flow characteristic is obtained, and thus accurate control of a steam turbine steam inlet flow is realized.

An object is to improve the accuracy of reactive power adjustment. Reactive-power command values corresponding to individual wind turbines are determined by correcting a predetermined reactive-power command value for an interconnection node A using reactive power correction levels set for the individual wind turbines.

A method and device for enhancing the power correction of optical measurements in an optical measurement arrangement, the steps including: providing a light source for producing a light beam; splitting the light beam into two beams; directing a first split light beam through an interrogation area and into an optics separation device; directing the light beams from the optics separation device and a second split light beam representing the intensity of the illumination of the main light beam of the light source into cells of a detector array; measuring and assessing the information obtained in the cells; and using this information to calculate the corrected value for the cells receiving the light beams from the optics separation device in order to adjust the power for the intensity of the light beam of the light source and / or to correct the intensity of the light beams from the interrogation area.

A peak power regulator is disclosed that functions within a Code Division Multiple Access (CDMA) transmitter to reduce peak power spikes within baseband signals, controlling the out-of-band emissions, and maintaining the in-band signal quality within an acceptable degradation. In-phase and quadrature baseband signals are input to an envelope magnitude predictor within the peak power regulator. The envelope magnitude predictor outputs an estimate for the magnitude of the envelope that will be generated when the inputted baseband signals are modulated. This estimate is input to a multiplier that generates a ration by dividing the estimate by a maximum acceptable envelope magnitude. The ratio is subsequently input to a mapping table that outputs a scaling factor sufficient for reducing peak power spikes. The scaling factor is subsequently subtracted from a value of one and multiplied by first delayed versions of the in-phase and quadrature baseband input signals. The outputs from these multiplication operations, after being filtered within lowpass filters to remove out-of-band emissions caused by the operations, are referred to as excess power correction signals. These excess power correction signals are then subtracted from second delayed versions of the in-phase and quadrature baseband input signals to generate in-phase and quadrature baseband output signals.

The invention discloses a power electronic transformer based on simple PFC (Power Factor Correction). All single phase structures in a three-phase circuit are same and independent to each other, wherein each phase comprises an input grade, an isolation grade and an output grade; input ends of an input-grade power transformer group and an output-grade power transformer group of each single phase are connected in a star shape; the input grade of each single phase adopts a series connection way; the input-grade power transformer group comprises a diode bridge-type circuit and a buck circuit and can realize the control of a power factor, and the alternating side of each power transformer group is connected in parallel with a pressure sensitive resistor; the isolation grade comprises a high-frequency DC / AC, a high-frequency transformer and a high-frequency AC / DC link, wherein a primary edge of the high-frequency transformer is connected in series with a capacitor, and the loss consumption of a switch tube is reduced under the action of a resonance soft switch; an output side of the isolation grade adopts a parallel connection way; and the output-grade power transformer group adopts a bridge-type inverting circuit, and an output side of the output-grade power transformer group is also connected with a filter. The invention has the advantages of simplifying the circuit structure, reducing the cost, realizing the power factor correction and resonance soft switch and increasing the conversion efficiency.

A method is directed to providing adaptive digital control for the PFC front-end of a switching mode power supply. The method uses an evaluation model to adjust control loop parameters of a control algorithm used by a controller on the primary side of the power supply. The method performs a series of step adjustments of the control loop parameter values to determine optimized values. In some implementations, the method determines and compares the line current THD corresponding to different control loop parameter values. The method provides simplified digital control loop design, optimizes PFC front-end performance, improves system efficiency by decreasing harmonic ripples, and reduces labor cost and time to market due to shorter research and development phase. System performance optimization is fully adaptive adjusted for changes in operating conditions due to, for example, environmental and temperature variations.

In accordance with the disclosure there is described herein a method of designing an anterior curve of a contact lens for the eye of a patient comprising the steps of providing a contact lens material having a posterior, a posterior curve having a predetermined asphericity, an anterior, an index of refraction and a center thickness; providing a geometry of a cornea, a distance power correction for the cornea and a near power correction for the cornea; determining a central distance power of the contact lens in air; calculating a central anterior radius of the contact lens using the posterior curve of the contact lens material, the index of refraction of the contact lens material, the center thickness of the contact lens material and the central distance power of the contact lens in air; calculating a center power of the contact lens on the eye of the patient using the index of refraction of tears at the posterior of the contact lens; and using an on-eye ray trace, said on-eye ray trace having a null lens compensation to create a targeted on-eye power profile.

In electric vehicle control, system voltage stabilization control is executed to reduce the difference between a target value and detected value of a system voltage generated by a voltage boosting converter for an AC motor. Further, conversion power control is executed to reduce the difference between a command value and detected value of the conversion power, which is defined as the output power of the voltage boosting converter. A conversion power correction quantity is computed from an input power operation quantity of the system voltage stabilization control and reflected in the conversion power control to correct the conversion power. Thus, variations in a system voltage caused by an error or the conversion power control can be reduced.

The invention relates to a power battery remaining power correction method and device, a vehicle and a storage medium. The method comprises the steps that the real value of the remaining power at a previous moment is acquired; the display value of the remaining power at the previous moment is acquired; according to the real value of the remaining power at the previous moment, the display value ofthe remaining power at the previous moment and the convergence value of preset remaining power, the display value of the remaining power at the current moment is determine; the power battery is discharged after a period of time, and the real value of the remaining power after discharging and the display value of the remaining power after discharging are all equal to the convergence value of the preset remaining power. According to the invention, the jump of the display value of the remaining power during the use process of the power battery is effectively solved, and the experience of a driveris improved.

A driving circuit device for driving a load is provided. The driving circuit device includes a control module including a power correction module, and providing a control signal to adjust a current flowing through the load; and a pulse width modulation module being in cooperation with the power correction module to modulate the control signal, and including a voltage providing unit providing a pulse width modulation signal; and a Schmitt trigger circuit.

The invention relates to a megawatt liquid flow battery energy storage power station real-time power control method and a system thereof. The method includes the following steps of A), reading total power demand value of a liquid flow battery energy storage power station and related operation data of the power station in real time, and conducting storing and managing on the data; B) calculating initial power command value of liquid flow battery energy storage subelements of the liquid flow battery energy storage power station; C) calculating power command value to be allocated to the liquid flow battery energy storage subelements; and D) after the power command value of the liquid flow battery energy storage subelements is collected, outputting the power command value to the liquid flow battery energy storage power station. The system comprises a communication module, a data storage and management module, a total power initial allocation control module and a real-time power correction module. The method and the system have the advantages of being convenient to operate, easy to achieve and control in the process of actual application and the like. The method and the system can achieve the aims of effectively controlling and allocating of real-time power of the megawatt liquid battery energy storage power station.

The invention discloses a power battery SOH (state of health) value estimation method and system. The method includes the following steps that: step S1, it is confirmed that a power battery enters a slow charging mode; step S2, whether the SOC value of the power battery has been subjected to OCV correction before charging is judged, if the SOC value of the power battery has been subjected to the OCV correction before charging, a step S3 is performed; step 3, a first power correction value is obtained, wherein the first power correction value is an OCV-corrected SOC value; step S4, a cumulativedischarging capacity from a time point when OCV correction is performed to a time point before charging is acquired; step S5, a first charging capacity is acquired after the power battery is fully charged; step S6, the actual capacity of the battery is calculated according to the first charging capacity, the cumulative discharging capacity, and the first power correction value; step S7, the preset initial capacity of the battery is obtained; and step S8, the SOH value of the battery is obtained according to the actual capacity and initial capacity of the battery. With the power battery SOH (state of health) value estimation method and system of the invention adopted, a large quantity of calibration data or laboratory estimation is not required, estimation parameters can be obtained onlineduring normal use, and a process is simple and accurate.

Methods and apparatuses for providing a solution for incompatibility between nonsinusoidal waveform uninterruptible power supply (UPS) systems and active power factor correction (PFC) loads are disclosed. An embodiment of the invention includes generating a nonsinusoidal signal waveform (e.g., a voltage waveform), to be delivered to the load, with a pulse width modulation (PWM) duty width, sampling the nonsinusoidal signal waveform to collect output signal samples, and adjusting the duty width to control the nonsinusoidal signal waveform as a function of the output signal samples to deliver a desired signal characteristic (e.g., RMS signal level) to the load. In embodiments of the invention, the output duty width is adjusted differently in cases of rising and falling power consumption, respectively, by the load. Techniques disclosed herein find broad applicability in UPS systems and inverters and improve efficiency and reliability for end users and utility providers.

A method and apparatus for controlling uplink transmission power in a mobile communication system are provided. In the method, an Advanced Mobile Station (AMS) determines uplink transmission power based on a measured path loss, an uplink noise and interference level received from an Advanced Base Station (ABS), a target Signal-to-Noise and Interference Ratio (SINR), and an offset. An initial offset value is determined based on a number of retransmissions of an initial ranging code performed until an initial ranging process is completed, a transmission power unit used for retransmission of the initial ranging code, and a power correction value received from the ABS upon completion of the initial ranging process with the ABS.

A vehicle control apparatus includes a motor unit, a power accumulating device, a charging power control section, a vehicle state detecting section, a braking / driving force control section, a turning determination section and a charging power correction section. The motor unit is configured to generate an independent driving / braking force for at least each of left and right driving wheels. The charging power control section is configured to set charging power supplied to the power accumulating device in accordance with a power accumulation state of the power accumulating device. The braking / driving force control section is configured to control a braking force or a driving force generated by the motor unit based on the operating state of the vehicle. The turning determination section is configured to determine whether a prescribed vehicle turning condition exists. The charging power correction section is configured to increase the charging power when the prescribed vehicle turning condition exists.