Abstract: A method of controlling a regulator with a pilot device includes periodically detecting an outlet pressure at an outlet of the regulator with a feedback pressure sensor. The method also includes comparing each detected outlet pressure with a set-point control pressure. Additionally, the method includes opening an exhaust valve when a detected outlet pressure is greater than the set-point control pressure so that a loading gas, which is applied to a top surface of a diaphragm of the regulator, exhausts out through the exhaust valve to reduce loading on the diaphragm. The method further includes sensing a loading pressure in the outlet port with a loading pressure sensor after opening the exhaust valve and comparing the loading pressure to a predetermined minimum threshold pressure. When the loading pressure is equal to or less than the predetermined minimum threshold value, the method includes closing the exhaust valve.

Abstract: This disclosure relates to systems, methods, and devices useful for monitoring and controlling water to be used, for example, in oil and natural gas production and hydraulic fracturing processes. An on-line unit for measuring, controlling, and optimizing the quality of water being used during the hydrocarbon production or hydraulic fracturing processes is also disclosed. Optimizing and controlling can include measuring one or more properties associated with the production water to be sure that the one or more properties are within an acceptable range and, if the one or more properties are not within the acceptable range for each respective property being measured, causing a change in flow of one or more water sources and/or one or more chemicals.

Abstract: An HVAC controller that can detect if a user's mobile wireless device is currently connected to and recognized by a building's wireless local area network is disclosed. Depending on whether or not the user's mobile wireless device is currently connected to and recognized by the building's wireless local area network, the HVAC controller basis its control on unoccupied or occupied settings.

Abstract: A control module for controlling a thermostatically controlled device includes a processor apparatus adapted to obtain first values for a plurality of parameters for the thermostatically controlled device, the parameters including actual power consumed by the thermostatically controlled device and a number of input parameters, determine a learned correlation function for the thermostatically controlled device based on the obtained values, wherein the learned correlation function relates power consumption of the thermostatically controlled device to at least the number of input parameters, obtain second values for each of the number of input parameters for a future usage period, and determine at least one recommended set point for the thermostatically controlled device using the learned correlation function and at least the second values for each of the number of input parameters.

Abstract: Message latency between an HVAC controller located within a building and a remote server may be reduced in response to a determination that a user is in proximity to the HVAC controller, and message latency may be increased when a user is not expected to be proximity to the HVAC controller. This may reduce the overall power consumption of an HVAC controller while still maintaining a good user experience. This can be particularly important for HVAC controllers that are powered by a local energy storage device, such as a battery.

Abstract: Hydronic heating systems, controllers for such systems, and methods of using/operating same are disclosed herein. In one example embodiment, such a system includes at least one condensing boiler and at least one non-condensing boiler, and at least one controller configured for utilizing at least one PID control program to generate at least one signal for controlling firing rates of one or more of the boilers based upon sensed water temperature and temperature setpoint inputs. Depending upon the mode of operation, the at least one PID control program is a first PID control program dedicated to controlling only the at least one condensing boiler, or is a second PID control program dedicated to controlling only the at least one non-condensing boiler, or includes both the first and second PID control programs. Also, outside air temperature serves as a basis for generating the temperature setpoint inputs.

Abstract: A method and apparatus for providing proactive current protection. In one embodiment, the method comprises: prior to transitioning to a new state for an integrated circuit (IC), calculating a sum of expected powers for a plurality of domains in the IC by calculating an expected current for each of the plurality of domains based on an individual domain frequency in the new state and multiplying the expected current with its associated voltage for each of the plurality of domains for the new state; comparing the sum to a power limit; and if the sum is greater than the power limit, then reducing the individual domain frequency associated with at least one domain in the plurality of domains to maintain the total instantaneous power of the IC below the power limit.

Abstract: Embodiments of the invention are generally directed to a linear regulator with improved power supply ripple rejection. An embodiment of an apparatus includes an linear regulator to receive a system power supply and to generate a regulated power supply; a first voltage reference generator to generate a first voltage reference for the linear regulator; a second voltage reference generator to generate a second voltage reference for the linear regulator; and a voltage reference and power switcher. In some embodiments, the voltage reference and power switcher is to switch a voltage reference for the linear regulator from the first voltage reference to the second voltage reference and is to switch a part of a power supply for the linear regulator from the system power supply to the regulated power supply.

Abstract: A voltage-to-current converter is disclosed. The voltage to current converter includes a converter circuit having an input node, an amplified signal node and an output. The input node is configured to receive a sinusoidal voltage signal and the output is configured to provide a half-wave current signal. A transistor having a gate, a source, and a drain is coupled to the input node. The input node is coupled to one of the source or the drain. The amplified signal node is coupled to the gate. A process tracking stabilizer is coupled to the transistor at the source or the drain not coupled to the input node. The process tracking stabilizer is configured to generate a control voltage for the transistor. The control voltage is configured to maintain a predetermined non-zero voltage at the input node of the converter circuit during a negative cycle of the sinusoidal voltage signal.

Abstract: In an embodiment, a voltage regulator is disclosed. The voltage regulator circuit includes a switch, a first feedback circuit and a second feedback circuit. The switch is configured to receive an input signal at a first terminal and an error signal at a second terminal and configured to generate an output signal at a third terminal. The first feedback circuit includes a first transistor and a second transistor configured to control the error signal at the second terminal of the switch in response to a difference between the output signal and a reference signal. The second feedback circuit is configured to sense the error signal and generate a tail current at the second node and the fourth node to maintain substantially equal currents in the first transistor and the second transistor, respectively, thereby causing a voltage of the output signal as substantially equal to a voltage of the reference signal.

Abstract: A device, system, and method for global maximum power point tracking comprises monitoring an output power of a DC power source while executing a maximum power point tracking algorithm and adjusting a maximum power point tracking command signal in response to the output power being less than a reference output power. The command signal is adjusted until the output power exceeds a previous output power by a reference amount. The command signal may be a voltage command signal, a current command signal, an impedance command signal, a duty ratio command signal, or the like.

Abstract: A direct-current power supply utilizing system includes: at least one direct-current power supply that produces a direct-current output; an alternating-current commercial power supply; a direct-current converter that converts the alternating-current commercial power supply into direct-current power; and a direct-current load device that receives supply of direct-current power from both at least one direct-current power supply and the commercial power supply which has been converted into direct-current power, where a back-flow prevention diode is individually connected between the at least one direct-current power supply and the direct-current load device and between the direct-current converter and the direct-current load device, and a power supply priority supply device that preferentially supplies power to the direct-current load device from the side of the direct-current power supply is connected.

Abstract: A circuit capable of keeping input impedance constant is provided. Further, a circuit which can contribute to improvement in power feeding efficiency in power feeding by a magnetic resonance method is provided. A voltage (a former voltage) proportional to a direct-current voltage input to a DC-DC converter from the outside and a voltage (a latter voltage) proportional to a current input from the outside are detected, and the ratio of the former voltage and the latter voltage are held constant. Accordingly, input impedance can be kept constant. Further, impedance conversion is performed in the DC-DC converter. Thus, even when the battery in which power feeding is performed exists on an output side of the DC-DC converter, input impedance can be kept constant. Consequently, power can be supplied to a power receiving device including the DC-DC converter and the battery with high power feeding efficiency by a magnetic resonance method.

Abstract: A secondary power source system for a communication device includes a charging unit configured to receive a primary power input and restrict a current used for charging to a predetermined amount. The current is part of a first output of the charging unit. The system further includes a storage unit including a device that stores electrical energy, the storage unit configured to receive the first output from the charging unit with restricted current and generate a second output, a regulating unit configured to receive the second output from the storage unit and generate a third output, a selector unit configured to perform a logical OR operation with the primary power input, the first output from the charging unit and third output from the regulating unit, and to generate a fourth output, and a shutdown unit configured to shutdown operation of the secondary power system when the storage unit has been expended.

Abstract: A reference voltage circuit including a constant voltage circuit and a resistance voltage divider circuit. The constant voltage circuit includes a Zener diode, and a bias current circuit connected in series with the Zener diode and causing a constant current to flow into the Zener diode. The resistance voltage divider circuit is connected in parallel with the Zener diode, and includes first and second resistors connected in series. The first resistor is connected to a cathode side of the Zener diode, and is formed of a low temperature coefficient resistor body that is temperature-independent. The second resistor is connected to an anode side of the Zener diode, and is formed of a resistor body having temperature characteristics that are the reverse of output temperature characteristics of the Zener diode.

Abstract: A voltage regulator, which contains a circuit to determine its output power. It has an output node providing an output voltage for a load; current sensing means for sensing an output current flowing at the output node; voltage providing means for providing a digital representation of the output voltage or of an input voltage to the voltage regulator; output power determination means comprising a digitally controllable variable resistance circuit receiving the digital voltage representation from the voltage providing means and generating a resistance, wherein the variable resistance circuit is connected to the current sensing means to obtain a signal that depends upon the output current and generates a voltage depending on the generated resistance and the obtained signal; and the output power determining means are adapted to determine the output power of the voltage regulator based on the voltage generated by the variable resistance circuit.

Abstract: A steering system for a marine vessel comprises a helm, a control head, and a joystick. The helm and control head may respectively provide user inputted steering commands and user inputted shift and throttle commands on a first CAN network. The joystick and the control head may respectively provide user inputted steering commands and user inputted shift and throttle commands on a second CAN network. The helm may provide user inputted steering commands on the first CAN network. The control head may provide user inputted shift and throttle commands on the second CAN network. The joystick may provide user inputted steering commands and user inputted shift and throttle commands on either the first CAN network or the second CAN network.

Abstract: A shift safety device for a manual transmission having a gear shift shaft that rotates to select shift gates and moves to shift gears. The device has a blocking element which, during selector motion towards a shift gate, is driven by the gear shift shaft, against a spring, from a starting position into a blocked position, in which the device blocks further selector motion of the gearshift shaft, and which, during subsequent shifting motion of the gearshift shaft, is released and returned back to the starting position, by the spring, thereby permitting further selector motion. A driver arm, disposed on the gear shift shaft, moves the blocking element tangential to the arc traversed during selector motion by the driver arm between the starting and blocking positions. The blocking element moves in the linear track traversed during shifting of the driver arm and is pretensioned toward the starting and center positions.

Abstract: A method for suspending an idle device includes receiving, by a processor, an indication that a device having a communication channel is connected to a host device. The method then includes determining a first timeout value associated with the communication channel and a second timeout value associated with the first device. The first timeout value corresponds to an amount of time allotted for an operation to complete in the communication channel, and the second timeout value corresponds to an amount of time allotted for the device to be designated as idle before the device is suspended. The device is determined to be idle when the operation is pending in the communication channel for an amount of time that is greater than the first timeout value. The device is suspended when the device has been idle for an amount of time that is greater than the second timeout value.

Abstract: The present invention concerns an electronic circuit comprising a control signal processing circuit with a control signal input and a control signal output circuit, the processing circuit being arranged to process a control signal applied to the control signal input, and to operate in at least one of a first power mode and a second power mode, the second power mode having a lower power consumption than the first power mode. The electronic circuit further comprises a control signal processing circuit bypass means for providing, when the processing circuit is in the second power mode, a bypass connection for conveying the control signal from the control signal input to the control signal output circuit, thereby bypassing the processing circuit.

Abstract: A dispatch module implemented in at least one of a memory or a processing device is operatively coupled to multiple processing modules, each having a first clock configuration and a second clock configuration. The dispatch module, at a first time, changes a first processing module included in the multiple processing modules from a first clock configuration to a second clock configuration. The dispatch module prohibits, at a second time within a predetermined time period and after the first time, a second processing module included in the multiple processing modules from changing from the first clock configuration to the second clock configuration if an indicator associated with a number of changes of the multiple processing modules between a first clock configuration and a second clock configuration within the predetermined time period and prior to the second time satisfies a criterion.

Abstract: A clock tree in a circuit and an operation method thereof are provided. The clock tree includes at least two sub clock trees, at least two voltage-controllable power-mode-aware (PMA) buffers and a power-mode control circuit. The PMA buffers delay a system clock to serve as the delayed clock, and provide respectively the delayed clock to the sub clock trees. The power-mode control circuit provides at least two first power information to at least two function modules respectively, wherein a power mode of each of the function modules is determined according to the first power information respectively. The power-mode control circuit provides at least two second power information to the PMA buffers respectively, wherein a delay time of each of the PMA buffers is determined according to the second power information respectively.

Abstract: A method and apparatus for calibration of a clock signal used in data transmission is disclosed. The method includes a calibration having coarse and fine grain procedures. The coarse grain procedure begins from the center of a current eye and performs reads while decrementing the delay provided to the clock signal until at least one bit fails. This is repeated, from the center of the eye, incrementing until again at least one bit fails. The lower and upper last passing points are recorded. A fine grain procedure includes performing reads while decrementing, from the lower last passing point, recording points at which each bit fails until all fail. The fine grain procedure further includes incrementing, from the upper last passing point, recording points at which each bit fails until fail. Thereafter, a clock delay corresponding to the center of the new eye is determined based on the calibration data.

Abstract: In accordance with embodiments of the present disclosure, a bezel configured to mechanically couple to a housing for housing components of an information handling system may include one or more mechanical features for mechanically coupling the bezel to the housing, an information handling resource mechanically coupled to a mechanical structure of the bezel, and a bezel connector having a plurality of pins communicatively coupled to the information handling resource. The bezel connector may be configured to communicatively couple the information handling resource to a second information handling resource of the information handling system housed within the housing when the bezel is mechanically coupled to the housing.

Abstract: A portable computer may include a base, a lid, a base cylinder extending from the base, a lid cylinder extending from the lid, and a link. The link may couple the base cylinder to the lid cylinder fixing a positional relationship between the base cylinder and the lid cylinder so that the base cylinder frictionally engages with the lid cylinder.

Abstract: A computing device can include a base portion including a keyboard and a base coupling mechanism fixedly coupled to the base portion where the base coupling mechanism includes a rotating receiver. The computing device can include a display portion having a display coupling mechanism configured to be removably coupled to the rotating receiver of the base coupling mechanism. The display coupling mechanism of the display portion can be configured to be coupled to the rotating receiver of the base coupling mechanism in response to the display portion being slidably moved with respect to the base portion when a viewable surface of the display portion is aligned along a plane substantially parallel to a plane along which the keyboard of the base portion is aligned.

Abstract: An electronic device may have a display with a brightness that is adjusted based on ambient light data from one or more ambient light sensors. An ambient light sensor may be formed from a semiconductor substrate such as a silicon substrate. Sensor structures may be formed in the silicon substrate. Conductive vias or other conductive paths may be used to interconnect sensor structures on a frontside surface of the ambient light sensor to contacts on a backside surface of the ambient light sensor. The ambient light sensor may be mounted on a substrate layer in the electronic device. The substrate layer may be a planar layer of glass or plastic such as a transparent display layer. The contacts of the ambient light sensor may be mounted to corresponding contacts on the surface of the substrate layer. The substrate layer may be a thin-film transistor layer in a liquid crystal display.

Abstract: Provided are a window member for a display device of a portable terminal and a method for fabricating the window member. An inner surface of the window member is formed as a flat surface from a first end portion to a position adjacent to a second end portion, and an inner surface of the second end portion is formed inclined with respect to the flat surface in a direction toward an outer surface. According to the window member and the method for fabricating the same, shrinkage is minimized during hardening of melt resin by sufficiently delivering injection pressure for the melt resin over the entire molding space of a mold, thereby improving a product defect rate.

Abstract: An image display device includes a display to output an image, a first support plate disposed at a rear surface of the display for support, a second support plate spaced apart from a rear surface of the first support plate, and having electronic devices mounted thereon, and at least one hinge unit to connect the first support plate and the second support plate to each other by a hinge such that the second support plate resists transformation during transformation of the first support plate.

Abstract: The present invention provides a handheld device for controlling electronic equipment and an electronic equipment including the handheld device. The handheld device is electrically connected with a control unit of the electronic equipment. The handheld device includes an annulus, and a first and a second disc bodies arranged oppositely. A first contact point and at least three second contact points are arranged on the first disc body. A first probe and at least three second probes are arranged on the second disc body. The annulus is connected to the first disc body and is used for driving the first disc body to rotate. The second disc body is fixed to a shell of the electronic equipment.

Abstract: An electronic device includes a housing with a base wall, a support unit and a control wire unit. The support unit includes a connecting member and a supporting member. The connecting member is connected to the base wall and has a connection portion. The supporting member has an engaging piece connected to the connection portion to vary an included angle between the supporting member and the base wall. The control wire unit includes a winding mechanism, a wire member and a control mechanism. The control mechanism is operable to control the winding mechanism to adjust an unwound length of the wire member for controlling the included angle between the supporting member and the base wall.

Abstract: In embodiments of mobile computer device binding feedback, an application interface for a device application is displayed on a first display that is integrated in a dual-display mobile device. The application interface can also be displayed on a second display that is integrated in the dual-display mobile device. Binding position data is received from a binding system that movably couples the first display to the second display. Application context data that is associated with the device application is also received. Feedback can then be generated based on the binding position data and the application context data, where the feedback can be generated as audio feedback, video feedback, display feedback, and/or haptic feedback.

Abstract: An information handling system includes a flexible display screen, first and second display platforms, and a sliding pivot hinge. The sliding pivot hinge has at least two sliding pivot hinge sides, at least one sliding pivot hinge side is in physical communication with the first display platform. The flexible display screen is supported across the first and second display platforms by translation of the first display platform relative to the sliding pivot hinge.

Abstract: An electronic device is provided, comprising: a first case having a first accommodating space, where a first surface of the first case has a first opening for the first accommodating space; and an interface part having a bottom surface with a same shape as the first opening, where the bottom surface is a cross section with a greatest area of the interface part. M I/O interfaces are disposed inside the interface part, and connecting ports of the M I/O interfaces are exposed on a first surface of the interface part which is not the bottom surface, M is an integer greater than or equal to 1; and the M I/O interfaces are connected to a circuit board located inside the first case.

Abstract: The present invention provides a touch panel including a touch sensor and a connecting board. The touch sensor includes a touch substrate and a sensing electrode matrix with a plurality of connecting ends. The sensing electrode matrix is formed on the touch substrate, wherein the connecting ends of the sensing electrode matrix are separately located at at least two sides of the sensing electrode matrix. The connecting board is connected to the touch sensor, and the conducting wires in the connecting board are electrically connected to the connecting ends of the sensing electrode matrix. Furthermore, a touch panel manufacturing method is also provided.

Abstract: In one aspect, a device includes at least one solid state drive (SSD) and an element which prevents removal of the device from a computer housing with which the device engages with unique data on the SSD being accessible.

Abstract: A mounting rail for an insert assembly provided to fix in an installation frame of a computer includes one bearing surface to fix in a guide rail of the installation cage, one fastening for the insert assembly, whereby the mounting rail can be fixed laterally on the insert assembly, and a lever at a first end wherein the lever is mounted on a shaft such that an eccentric shape is formed and, by actuating the lever in an installed state, the mounting rail is lifted in a direction of the insert assembly.

Abstract: An information handling system cooling fan has a vibration filter that tunes out predetermined fan vibration frequencies to reduce fan vibration transfer from the cooling fan to an information handling system chassis in a targeted frequency range. For example, a leaf spring and damper are biased between the cooling fan and a fan bay support so that stiffness of the spring attenuates selected vibration frequency ranges of the cooling fan bay subsystem, such as frequency ranges where the vibrations have the greatest amplitude or frequency ranges where the vibrations tend to damage other components of the information handling system. In one embodiment, a vibration source generates out-of-phase vibrations that cancel cooling fan vibrations to further reduce overall system vibration output.

Abstract: An apparatus including a cold plate body; a channel module disposed within the cold plate body including a channel body and a plurality of channels projecting through the channel body; and a manifold disposed on the channel module, the manifold including an inlet and an outlet and a first plurality of apertures in fluid communication with the inlet and a second plurality of apertures are in fluid communication with the outlet. A method including introducing a fluid to an integrated cold plate disposed on an integrated circuit device, the integrated cold plate comprising a cold plate body extending about the device, the fluid being introduced into a manifold in fluid communication with a channel module disposed between the manifold and a base plate, the channel module, and including channels to direct the fluid toward the base plate, and collecting the fluid returned to the manifold.

Abstract: A system and method for switch management includes a switch including a plurality of switch modules, and a status display panel. The plurality of switch modules includes one or more power supply modules for providing power to the switch, one or more cooling modules for cooling the switch, and one or more switching modules. The switch is configured to detect the plurality of switch modules, interrogate the detected switch modules, hierarchically organize status information based on information associated with the interrogated switch modules, and display the organized status information on the status display panel. The status information is displayed on the status display panel using an interactive status display system. In some examples, the switch further includes a plurality of status indicators, and the switch is further configured to temporarily activate the status indicators in response to active use of the status display system.

Abstract: An apparatus includes a system test module that initiates a system power test for a computer system. The computer system includes one or more power supplies that provide power to system components. The system power test includes determining power system characteristics under various loading conditions. The apparatus includes a configure module that configures a system component during the system power test. The system component uses a higher amount of power after being configured than in a previous un-configured condition. The apparatus includes a de-configure module that de-configures the system component during the system power test. The system component uses a lower amount of power after being de-configured than in a previous configured condition. The apparatus includes a diagnostic module that measures power system performance of the computer system during varying loading conditions caused by configuring and de-configuring one or more system components by the configure module and the de-configure module.

Abstract: A voltage regulator may be provided that includes a first circuit to receive at least one feedback signal from a buck converter and to provide at least one driving signal to the buck converter to provide an output voltage based on the at least one feedback signal, and a second circuit to control a super-capacitor to provide the output voltage when the first circuit is not using the buck converter to provide the output voltage.

Abstract: A data storage system is implemented with an active power monitoring and control performed by a control node elected among a number of nodes. A real-time power monitoring information is supplied to the control node from, a power monitoring logic residing at each device in the system. The devices in the data storage system are pre-allocated with respective individual power budgets which are below the maximum power usage thereof. The power budgets of all the equipment cumulatively constitute a power budget assigned to the group of equipment. The control node controls dynamically and in real time power sharing between the plurality devices so that the devices with required power usage below the pre-allocated power budget can share their extra power credits with devices which are in need for extra power for performing its operation.

Abstract: Example implementations described herein are directed to the generation of a specification for automatic power management of a network on chip and/or a system on chip. Such example implementations can include automatically generating a specification comprising at least one of a power domain, an always-on indicator, a voltage domain, a voltage level, and a clock frequency for each of one or more agents of a System on Chip (SoC) and a Network on Chip (NoC), the voltage domain indicative of power supply of the each agent, and the power domain indicative of one or more power switch rules applied to the each agent.

Abstract: A peak power management system for networked smart IT devices. These smart devices have computing capability with at least one CPU and memory and can be networked. An uninterruptible power supply provides power to the smart devices. A central intelligent power management server controls the power consumed by all the smart devices networked with the server. The system uses priority based peak power management policies for smart IT devices assisted by fine grain control of external power drawn by each device. By applying different power management policies at different scheduled intervals and controlling the power consumption on the smart devices, the aggregated peak power demand is controlled. The policies can be adapted in-time to suit the actual, real-time power requirement of devices, their priorities, and applicable peak power limit at that time. Also, dynamic policy based peak power management can be extended to an intelligent hierarchical power distribution network.

Abstract: A power supply method includes providing a plurality of output powers to a plurality of power devices (PDs); acquiring a plurality of power statuses of the PDs (power devices); calculating a summation of the output powers provided to the PDs (power devices); determining whether the summation of the output powers exceeds a predetermined threshold; and under a condition that the summation of the output powers exceeds the predetermined threshold, adjusting the output powers provided to the PDs (power devices) based upon the power statuses of the PDs (power devices).

Abstract: A rating is provided for a computing application. Traffic data, power data, and/or network signaling load data is collected for a computing application and compared with other similar data. A rating for the computing application is provided based on the comparison.

Abstract: A device determines a first received power via a first input feed of a circuit board, and determines a second received power via a second input feed of the circuit board. The device further determines whether the first input feed and the second input feed are receiving power based on the first received power and the second received power. The device opens a switch, of the circuit board, when the first input feed and the second input feed are receiving power.

Abstract: The present invention aims to easily maintain a state of less power consumption, by providing a data processing apparatus comprising: a registering unit to register therein data for identifying a packet; a receiving unit to receive a packet transmitted through a network; a determining unit to, in a case where the receiving unit receives the packet while the data processing apparatus is operating in a power saving mode, determine whether or not to return the data processing apparatus from the power saving mode, on the basis of the data registered in the registering unit; an analyzing unit to perform an analysis process to the packet flowing on the network; a displaying unit to display a screen indicating a result of the analysis process by the analyzing unit; and an indicating unit to indicate the data to be registered in the registering unit, through the screen displayed by the displaying unit.

Abstract: An embodiment of a system for managing energy identifies a plurality of groups of virtual machines in a computer system and allocates the energy in the computer system for a next time interval to a plurality of groups of virtual machines based on an energy budget and a policy selected from a set of policies in conjunction with a minimum energy, a group priority and a virtual machine priority.