1428 results about "Power limits" patented technology

A method of providing closed-loop control of power flowing into and out of an energy storage system (ESS), wherein the ESS comprises a battery is provided. The method may be implemented as a computer control algorithm for determining the charge and discharge limits for the ESS in a hybrid electric vehicle (HEV), wherein the ESS comprises a battery pack or array. The method comprises determining charge and discharge power limits during each of a plurality of control loops, comparing these limits during each of the plurality of control loops, and providing a charge power limit output and a discharge power limit output for use in a subsequent control loop which are based upon the charge power limit and the discharge power limit. The charge power limit output and discharge power limit output are set equal to the discharge power limit and charge power limit, respectively, when the discharge power limit is greater than the charge power limit; and are selected from the group consisting of the charge power limit, the discharge power limit and zero when the discharge power limit is less than or equal to the charge power limit.

The invention relates to methods for informing an eNodeB on the transmit power status of a user equipment in a mobile communication system using component carrier (CC) aggregation. Furthermore, the invention is also related to the implementation of these methods by hardware and their implementation in software. The invention proposes procedures that allow the eNodeB to recognize the power usage status of a UE in a communication system using carrier aggregation. The UE indicates to the eNodeB, when the UE is close to using its total maximum UE transmit power or when it has exceeded same. This is achieved by the UE including indicator(s) and / or new MAC CEs to one or more protocol data units transmitted on respective component carriers within a single sub-frame that is providing the eNodeB with power status information. The MAC CEs may report a per-UE power headroom. Alternatively, the MAC CEs may report per-CC power headrooms and / or power reductions applied to the respective uplink CCs.

In a cordless power tool system, a battery pack which may removably attachable to a cordless power tool and to a charger may include at least one battery cell and a power limiting device. The power limiting device may be arranged in series with the at least one battery cell for limiting power output of the battery pack based on the component that is connected to the pack. Current and hence power out of the battery pack may be controlled as a function of total internal impedance in the battery pack, which may be adjusted depending on the component that is connected to the pack.

A gain adjustment apparatus, a gain adjustment method, and a tangible machine-readable medium thereof for a multiple input multiple output (MIMO) wireless communication system are provided. The MIMO wireless communication system comprises source antennas, destination antennas, relay stations (RSs) and a relay transmission power limit value. The gain adjustment method comprises the following steps: adjusting the gain of one single RS according to a gain calculation; multiplying the gains of other relay stations by a scaling value for adjustment. According to aforesaid method, the present invention can increase the system capacity of the MIMO wireless communication system.

A method and system for controlling a windpark power plant includes a central processing and control unit operatively coupled to wind turbines in the windpark to receive data from and selectively transmit at least one of data and control signals to each wind turbine, to reduce fatigue loads and comply with power limits.

A method for controlling operation of a hybrid powertrain is proposed, the hybrid powertrain comprising an internal combustion engine, an electric energy storage device, an electric machine, and an electro-mechanical transmission. The engine and the electric machine and the transmission are operative to transmit torque therebetween to generate an output. The method comprises determining optimum engine operation and an engine capability, and an operator torque request. A limit to the engine capability is determined based upon optimum engine operation, engine capability, and states of the parameters of the electrical energy storage device. Power limits are determined. The limit to the engine capability is adjusted based upon the power limits of the energy storage device. The engine operation is controlled based upon the engine capability and the adjusted limit to the engine capability.

A PWM controller has a line voltage input that allows using a start-up resistor for both start-up and power-limit compensations so that it can save the power consumption, ease the PCB layout, and shrink the power supply size. In the integrated circuit, a current switch used for both start-up and line voltage sensing is composed of a diode and a switch transistor. A current multiplier is used to improve the precise by canceling the impact of the integrated resistor's absolute value, which is composed of a transistor loop, a constant current and a reference current. Thus, by properly selecting the value of the start-up resistor, an identical output power limit for low line and high line voltage input can be achieved.

A fuel cell system employing a floating base load hybrid strategy for reducing fast voltage transients of a FCPM. A power request signal is applied to an average power calculation processor that calculates the average power requested over a predetermined previous period of time. A weighting function processor provides a weighting function based on the state of charge of an EESS. The power available from the FCPM and the EESS is applied to a power comparison processor. The available power is compared to the power request to provide a difference value between what is currently being provided and what is desired. The difference value is compared to power limit values of the EESS. The output value of this comparison is added to a filtered value to generate a signal for the change in the output power of the fuel cell stack based on the power request.

Disclosed is a control apparatus for a hybrid vehicle having an engine, a drive motor (3) that regenerates power, and an electric power storage device (6) that gives / receives power to / from the drive motor (3). The control apparatus includes power consumption means (2) for consuming power; a sensor (26, 27) that detects a state of charge of the electric power storage device; means (18, 23, 51) for detecting a driving state of the vehicle; and a controller (9). The controller (9) is programmed to calculate a chargeable energy amount Ecap in the electric power storage device (6) on the basis of a difference between a fully charged state of the electric power storage device and the detected state of charge; set a power |Pgen0| regenerated by the drive motor (3); calculate a chargeable power Pmax in the electric power storage device according to the detected state of charge; calculate a regenerated energy E resulting from regenerative braking from the detected driving state of the vehicle; calculate a charging power limit Pgenlmt according to the calculated regenerated energy E; and control the power consumption means (2) to consume a power equal to a difference between the power |Pgen0| regenerated by the drive motor (3) and the charging power limit |Pgenlmt| when the calculated regenerated energy E is greater than the chargeable energy amount Ecap in the electric power storage device and when the charging power limit |Pgenlmt| is smaller than the chargeable power |Pmax|.

A variable group power limit is enforced to limit the net power consumption of a group of devices in a computer system, and a variable device power limit enforced on each device is independently adjustable to satisfy the current group power limit. The device power limits are dynamically selected according to a power management method that selectively reduces the device power limits of lower-utilization devices and increases the device power limits of higher-utilization devices.

A system includes a plurality of processor cores and a power management unit. The power management unit may be configured to independently control the performance of the processor cores by selecting a respective thermal power limit for each of the plurality of processor cores dependent upon an operating state of each of the processor cores and a relative physical proximity of each processor core to each other processor core. In response to the power management unit detecting that a given processor core is operating above the respective thermal power limit, the power management unit may reduce the performance of the given processor core, and thereby reduce the power consumed by that core.

An apparatus and method for dynamically adjusting power limits for processing nodes and other components, such as peripheral interfaces, is disclosed. The apparatus includes multiple processing nodes and other components, and further includes a power management unit configured to set a first frequency limit for at least one of the processing nodes responsive to receiving an indication of a first detected temperature greater than a first temperature threshold. Initial power limits are set below guard-band power limits for components that do not have reliable reporting of power consumption or for cost or power saving reasons. The amount of throttling of processing nodes is used to adjust the power limits for the processing nodes and these components.

A laser utilizes a cavity design which allows the stable generation of high peak power pulses from mode-locked multi-mode fiber lasers, greatly extending the peak power limits of conventional mode-locked single-mode fiber lasers. Mode-locking may be induced by insertion of a saturable absorber into the cavity and by inserting one or more mode-filters to ensure the oscillation of the fundamental mode in the multi-mode fiber. The probability of damage of the absorber may be minimized by the insertion of an additional semiconductor optical power limiter into the cavity. To amplify and compress optical pulses in a multi-mode (MM) optical fiber, a single-mode is launched into the MM fiber by matching the modal profile of the fundamental mode of the MM fiber with a diffraction-limited optical mode at the launch end, The fundamental mode is preserved in the MM fiber by minimizing mode-coupling by using relatively short lengths of step-index MM fibers with a few hundred modes and by minimizing fiber perturbations. Doping is confined to the center of the fiber core to preferentially amplify the fundamental mode, to reduce amplified spontaneous emission and to allow gain-guiding of the fundamental mode. Gain-guiding allows for the design of systems with length-dependent and power-dependent diameters of the fundamental mode. To allow pumping with high-power laser diodes, a double-clad amplifier structure is employed. For applications in nonlinear pulse-compression, self phase modulation and dispersion in the optical fibers can be exploited. High-power optical pulses may be linearly compressed using bulk optics dispersive delay lines or by chirped fiber Bragg gratings written directly into the SM or MM optical fiber. High-power cw lasers operating in a single near-diffraction-limited mode may be constructed from MM fibers by incorporating effective mode-filters into the laser cavity. Regenerative fiber amplifiers may be constructed from MM fibers by careful control of the recirculating mode. Higher-power Q-switched fiber lasers may be constructed by exploiting the large energy stored in MM fiber amplifiers.

The present invention provides a system and method for transmitting an ultrawideband (UWB) signal that is composed of an orthogonal frequency-division multiplexing (OFDM) based signal that is transmitted in an underlay manner and an impulse radio based signal that is transmitted in an overlay manner. The system and method are effective in determining an interference temperature for each of multiple carriers within the UWB signal and classifying each one of the multiple carriers of the channel as being an interfered carrier or a non-interfered carrier based on the interference temperature for each one of multiple carriers. The desired signal is then transmitted on the interfered carriers at a signal power that is not greater than the power limit of the underlay UWB policy and on the non-interfered carriers at a signal power that is greater than the power limit of the underlay UWB policy.

In one embodiment, an upper power limit and an average power limit are specified for each server of a computer system. Power to each server is controlled so that the instantaneous power consumption does not exceed the upper power limit and the average power consumption does not exceed the average power limit. Servers whose average power consumption is currently less than the average power limit are identified. The instantaneous power consumption of each identified server is temporarily allowed to exceed its average power limit, to maximize server throughput. In cases where the average power limit of a device is reduced, such as may occur during peak energy pricing hours, the instantaneous power consumption of the device may be throttled down below the average power limit until the average power consumption no longer exceeds the average power limit.

To address the need for a resource allocation scheme that results in a better tradeoff between the cell-edge performance and the overall spectral efficiency, a communication system is provided that allocates uplink transmit power to user equipment (UEs) based on a fractional power control scheme. In another embodiment, since the cell-edge users are also likely to be power limited, the communication system may implement a minimized uplink transmission bandwidth resource allocation scheme that may work with the fractional power control scheme to achieve a level of performance desired for uplink transmissions in 3GPP (Third Generation Partnership Project) and 3GPP2 Evolution communication systems.

A variable group power limit is enforced to limit the net power consumption of a group of devices in a computer system, and a variable device power limit enforced on each device is independently adjustable to satisfy the current group power limit. The device power limits are dynamically selected according to a power management method that selectively reduces the device power limits of lower-utilization devices and increases the device power limits of higher-utilization devices.

Low-frequency bandwidth extension in the form of dynamic electrical equalization may be applied to loudspeakers so long as the excursion capability of their drive units as well as velocity limits of any port(s) or excursion limits of any associated passive radiator(s), and the power limits of the drive units are not exceeded. The bandwidth extension maximizes low-frequency bandwidth dynamically such that excursion is fully utilized over a range of drive levels, without exceeding the excursion limit. Additional limiting control is available for port air velocity or passive radiator excursion, and loudspeaker drive unit electrical power. The system applies to open back, closed box, vented box, and more complex box constructions consisting of combinations of these elements for loudspeaker designs using design parameters appropriate to each system.

A method for calculating a high-altitude power curve for a wind turbine is provided, the method including the steps of determining a cp-λ curve for a predetermined blade pitch angle of said wind turbine; calculating a first power curve without power limit based on the cp-λ curve; and calculating the high-altitude power curve with power limit from said first power curve, thereby using a site air density.

A technique for improving link performance in a wireless communication system includes detecting whether subscriber stations in the wireless communication system are power-limited. The subscriber stations include at least a first subscriber station that is power-limited and a second subscriber station that is not power-limited. The technique assigns a first reference signal having a first cubic metric to the first subscriber station and a second reference signal having a second cubic metric to the second subscriber station. In this case, the first cubic metric is lower in magnitude than the second cubic metric.

A tail rotor system for a helicopter includes a gear box housing retainer (66) coupled to the tail boom (16) of the helicopter. The tail rotor system also includes a power-limiting device (50) configured to disconnect the tail rotor from a power plant for driving the tail rotor about a rotor axis of rotation.

A washing machine having a plurality of washing units to separately wash laundry according to quantity and type of the laundry, and a method to control the same. In the washing machine having the plurality of washing units to separately wash laundry having different quantities and types, when the plurality of washing units are being simultaneously operated, a current load value of one of the washing units is detected through monitoring of a power line, to thereby determine the operation state of the washing unit. Therefore, the operation of the other washing unit may be controlled so that the power limit is not exceeded. As a result, the plurality of washing units may be operated simultaneously within the range of allowable power capacity of the installation place of the washing machine.

Various aspects of the disclosure relate to reporting a power limit along with an indication of at least one constraint upon which the power limit is based. In some aspects, the constraint is a radio frequency (RF) exposure constraint. For example, a power headroom limit calculated by a first apparatus may be constrained by a specific absorption rate (SAR) limit or a maximum permissible exposure (MPE) limit. The first apparatus may thus report to a second apparatus the current power headroom limit of the first apparatus along with an indication of whether the power headroom limit is constrained by an SAR limit or an MPE limit (e.g., as opposed to being constrained by a maximum transmit power limit). The second apparatus may then schedule the first apparatus taking into account the power headroom limit and the corresponding constraint (e.g., maximum power or SAR / MPE).

There are provided an image forming apparatus which can implement on-demand fusing with quick rise in temperature by using the upper current (power) limit of a commercial power supply more effectively and a control method for the apparatus. This image forming apparatus includes a rechargeable battery device capable of charging and discharging, and is designed such that a load other than the heating element of a fusing device can receive power from the commercial power supply and / or the rechargeable battery device. When printing is to be executed, the temperature of the fusing device is detected by a temperature detection element provided for the fusing device, and the supply of power from the commercial power supply or rechargeable battery device to the load is controlled in accordance with the detected temperature. The power supplied from the commercial power supply to the fusing device is then limited to a limit level corresponding to the control result.

One embodiment provides a method of managing power in a datacenter having a plurality of servers. A number of policy settings are specified for the power center, including a power limit for the datacenter. The power consumption attributable to each of a plurality of applications executable as a job on one or more of the servers is determined. The power consumption attributable to each application may be further qualified according to the type of server on which the application is executed. Having determined the power consumption attributable to various applications executable as jobs, the applications may be executed on the servers as jobs such that the total power consumption attributable to the currently executed jobs remains within the selected datacenter power limit.

A method of allocating power to ports in an Ethernet switch, including: (1) assigning a configuration power to a selected port, wherein the assigned configuration power is less than a power supplied by the selected port to a powered, (2) enabling and powering the selected port in a single indivisible step, (3) determining the power limit of a device coupled to the selected port, (4) comparing the power supplied by the selected port to the device with the configuration power assigned to the selected port, and (5) if the power supplied by the selected port to the device is greater than the configuration power assigned to the selected port, then increasing the configuration power of the selected port to correspond with the power limit of the device.

The invention provides a wind power optimizing scheduling method based on power forecast, which is applied to a power scheduling operation schedule solution containing wind power. In the method, the power forecast curve of a wind power station are utilized; the peak regulation capacity and the safe and stable limit of a system are calculated, so that scheduling of total output of the wind power within the scheduling range is divided into restricted time interval scheduling and non-restricted time interval scheduling; for the non-restricted time interval scheduling, the error scope of the forecast power generation is considered based on a forecast power generation curve; and for the restricted time interval scheduling, wind power forecast errors are considered based on the restriction of the aggregate limit of the wind power stations and the forecast power generation output of each wind power station, thus optimizing power generation power limit value allocation of each wind power station, so that the system can maximally digest the wind power under the condition of meeting the requirement of safe and stable operation. A wind power scheduling curve is executed by the power generation of the wind power station so as to strength safety and stability of the power grid operation, intensify the digestion capacity of the wind power and maximally utilize the wind power.