Abstract: A system comprises sets of batteries, each set having a power capacity less than a standup power capacity. The system is configured to couple the sets of batteries to power supplies to configure each of the power supplies with battery power less than the standup capacity. Responsive to a disruption of a first power supply, the system couples a first set of batteries, coupled to the first power supply, to a second power supply to couple to the second power supply battery power to not less than the standup power capacity. A method comprises coupling sets of batteries to power supplies to configure each of the power supplies to have less than a standup capacity. The method includes coupling sets batteries of one power supply to a second power supply to provide the second power supply with a battery capacity not less than the standup capacity.

Abstract: A battery comprises a plurality of battery modules. A method determines a load-state of the battery and selects a set of the battery modules to configure, to produce a load-state capacity of the battery based on the load-state. A load-state capacity of the battery can be a sub-capacity of the battery less than a rated capacity of the battery and the method can configure the set of battery modules to produce the sub-capacity based on the load-state comprising the battery disconnected from a load. A battery system can comprise a battery having a plurality of battery modules and a controller configured to perform the method. A battery system can comprise a battery having a plurality of battery modules, and an actuator and a module retainer that can position a battery module in or out of contact with a module interconnect.

Abstract: A power system comprises a battery connected to a first power supply. The power system determines that the power supply has transitioned to a first state and, in response, disconnects the battery from the first power supply and connects the battery to a second power supply. The power system determines that the first power supply has transitioned to a second state and, in response, the power system disconnects the battery from the second power supply and reconnects the battery to the first power supply. The power system can include a second battery and can connect and disconnect the second battery and the power supplies in response to a change in state of the power supplies. A method can dynamically connect and disconnect batteries and power supplies of a power system based on states of the power supplies.

Abstract: Managing of battery pack cell capacity is provided. The managing includes monitoring temperature of one or more cells within the battery pack, and based on temperature of a cell of the one or more cells being at or below a low temperature threshold, initiating discharging of cells with the battery pack at a specified discharge power level to heat the cells within the battery pack. The managing also includes, based on temperature of a cell of the one or more cells rising to or above an upper temperature threshold after initiating discharging of the cells within the battery pack, discontinuing the discharging of cells within the battery pack.

Abstract: Methods, systems and computer program products for preventing unauthorized use of protected equipment in violation of export regulations are provided. Aspects include periodically obtaining a location of the protected equipment and storing the location in a location log in a non-volatile memory. Upon receiving a request to operate the protected equipment, aspects also include obtaining the location log from the non-volatile memory and parsing data from the location log to determine whether the protected equipment entered a restricted geographic area. Based on a determination that the protected equipment did not enter a restricted geographic area, aspects include granting the request to operate the protected equipment.

Abstract: A battery comprises a plurality of battery modules. A method determines a load-state of the battery and selects a set of the battery modules to configure, to produce a load-state capacity of the battery based on the load-state. A load-state capacity of the battery can be a sub-capacity of the battery less than a rated capacity of the battery and the method can configure the set of battery modules to produce the sub-capacity based on the load-state comprising the battery disconnected from a load. A battery system can comprise a battery having a plurality of battery modules and a controller configured to perform the method. A battery system can comprise a battery having a plurality of battery modules, and an actuator and a module retainer that can position a battery module in or out of contact with a module interconnect.

Abstract: Systems and methods for boosting battery voltage with boost converters are provided. Aspects include coupling a discharge path of a battery to an input side of a power converter in a power supply, wherein the power supply comprises a rectifier and the power converter. A charge path of the battery is coupled to an output side of the power converter and a processor monitors an output voltage of the power converter. The processor also monitors an input voltage of the power converter and responsive to the output voltage of the power converter dropping below a threshold voltage, the processor enables the discharge path.

Abstract: Electric power devices and control methods are provided which automatically select a line voltage or phase voltage of an AC voltage supply. The electric power device includes a switchable circuit, a sensor and a switch control. The switchable circuit connects to the AC voltage supply, and includes multiple switchable elements. The sensor ascertains a voltage level of the AC voltage supply, and the switch control automatically establishes a configuration of the switchable circuit through control of the multiple switchable elements. The switch control couples the electric power device in a line-line (delta) configuration to the AC voltage supply when the voltage level is in a first voltage range, and a line-neutral (wye) configuration when the voltage level is in a second voltage range.

Abstract: An electromechanical assembly is provided controlled by voltage across a motor or with an electronic system. The electromechanical assembly includes a control circuit coupled to sense voltage at the motor or within the electronic system, and an electromechanical actuator energized by the voltage sensed by the control circuit. A movable element is movable by the electromechanical actuator from an operational position to a quiesced position when the voltage sensed by the control circuit falls below a quiesced threshold. In certain embodiments, the voltage being sensed is across a motor of an air-moving assembly, which resides within a support structure, or the voltage being sensed is within the electronic system, which resides within the support structure, and the movable element is an interlock element which interlocks to the support structure to prevent removal of one or more components from the structure when sensed voltage is above the quiesced threshold.

Abstract: Electric power devices and control methods are provided which automatically select a line voltage or phase voltage of an AC voltage supply. The electric power device includes a switchable circuit, a sensor and a switch control. The switchable circuit connects to the AC voltage supply, and includes multiple switchable elements. The sensor ascertains a voltage level of the AC voltage supply, and the switch control automatically establishes a configuration of the switchable circuit through control of the multiple switchable elements. The switch control couples the electric power device in a line-line (delta) configuration to the AC voltage supply when the voltage level is in a first voltage range, and a line-neutral (wye) configuration when the voltage level is in a second voltage range.

Abstract: Systems and methods for boosting battery voltage with boost converters are provided. Aspects include coupling a discharge path of a battery to an input side of a power converter in a power supply, wherein the power supply comprises a rectifier and the power converter. A charge path of the battery is coupled to an output side of the power converter and a processor monitors an output voltage of the power converter. The processor also monitors an input voltage of the power converter and responsive to the output voltage of the power converter dropping below a threshold voltage, the processor enables the discharge path.

Abstract: Electric power devices and control methods are provided which automatically select a line voltage or phase voltage of an AC voltage supply. The electric power device includes a switchable circuit, a sensor and a switch control. The switchable circuit connects to the AC voltage supply, and includes multiple switchable elements. The sensor ascertains a voltage level of the AC voltage supply, and the switch control automatically establishes a configuration of the switchable circuit through control of the multiple switchable elements. The switch control couples the electric power device in a line-line (delta) configuration to the AC voltage supply when the voltage level is in a first voltage range, and a line-neutral (wye) configuration when the voltage level is in a second voltage range.

Abstract: An electromechanical assembly is provided controlled by voltage across a motor or with an electronic system. The electromechanical assembly includes a control circuit coupled to sense voltage at the motor or within the electronic system, and an electromechanical actuator energized by the voltage sensed by the control circuit. A movable element is movable by the electromechanical actuator from an operational position to a quiesced position when the voltage sensed by the control circuit falls below a quiesced threshold. In certain embodiments, the voltage being sensed is across a motor of an air-moving assembly, which resides within a support structure, or the voltage being sensed is within the electronic system, which resides within the support structure, and the movable element is an interlock element which interlocks to the support structure to prevent removal of one or more components from the structure when sensed voltage is above the quiesced threshold.

Abstract: An electromechanical assembly is provided controlled by voltage across a motor or with an electronic system. The electromechanical assembly includes a control circuit coupled to sense voltage at the motor or within the electronic system, and an electromechanical actuator energized by the voltage sensed by the control circuit. A movable element is movable by the electromechanical actuator from an operational position to a quiesced position when the voltage sensed by the control circuit falls below a quiesced threshold. In certain embodiments, the voltage being sensed is across a motor of an air-moving assembly, which resides within a support structure, or the voltage being sensed is within the electronic system, which resides within the support structure, and the movable element is an interlock element which interlocks to the support structure to prevent removal of one or more components from the structure when sensed voltage is above the quiesced threshold.

Abstract: Electric power devices and control methods are provided which automatically select a line voltage or phase voltage of an AC voltage supply. The electric power device includes a switchable circuit, a sensor and a switch control. The switchable circuit connects to the AC voltage supply, and includes multiple switchable elements. The sensor ascertains a voltage level of the AC voltage supply, and the switch control automatically establishes a configuration of the switchable circuit through control of the multiple switchable elements. The switch control couples the electric power device in a line-line (delta) configuration to the AC voltage supply when the voltage level is in a first voltage range, and a line-neutral (wye) configuration when the voltage level is in a second voltage range.

Abstract: Apparatus and method are provided for facilitating air cooling of an electronics rack. The apparatus includes a tile assembly, temperature sensor and controller. The tile assembly is disposed adjacent to the electronics rack, and includes a perforated tile and one or more controllable air-moving devices associated with the perforated tile for moving air through the perforated tile. The temperature sensor is positioned for sensing air temperature adjacent and external to, or within, the electronics rack, and the controller is coupled to the tile assembly and the temperature sensor for controlling operation of the air-moving device. Airflow through the tile assembly is adjusted based on air temperature sensed, thereby facilitating air cooling of the electronics rack. In one embodiment, the tile assembly is a floor tile assembly with an air-to-liquid heat exchanger disposed between the perforated tile and the air-moving device for cooling air passing through the floor tile assembly.

Abstract: An environmental conditioning system for a computer room includes a perforated tile, a heat exchanger mounted to the perforated tile, and a forced air system mounted to the heat exchanger. The forced air system being configured and disposed to direct a flow of air having a first temperature into the heat exchanger. The flow of air exits the heat exchanger at a second temperature and passes through the perforated tile into the computer room. The second temperature is distinct from the first temperature.

Abstract: Automated control is provided of rotational velocity of an air-moving device cooling an electronics subsystem of an electronics rack. The automated control includes: automatically responding to a failure event associated with the electronics subsystem of the rack by setting rotational velocity of the air-moving device to a first upper limit (RPM1) above a normal operating limit; sensing motor temperature of a motor of the air-moving device; automatically increasing rotational velocity of the air-moving device to a second upper limit (RPM2) if the sensed motor temperature is below a first predefined temperature threshold (T1), wherein RPM2>RPM 1; maintaining rotational velocity of the air-moving device at the second upper limit while the sensed motor temperature is below a second predefined temperature threshold (T2), wherein T2>T1; and returning to normal operating rotational velocity of the air-moving device subsequent to servicing of the electronics rack responsive to the event.

Abstract: In a delta-connected power supply system, phase switching circuits are employed and are activated during the failure of one of N+1 converter units. This activation is employed even though there has been no outage in any one of the input phases. The result is two operating converters running in effect as three-phase converters. Since each of the converters then acts as a full wave three-phase bridge with a resistor load, the line currents are perfectly balanced although unity power factor is not maintained during this non-normal mode of operation. In such circumstances, higher power factor is temporarily sacrificed to achieve continuous operation and therefore higher overall system reliability.

Abstract: Disclosed is a circuit for preventing damage to a controllable switching circuit as a result of a reverse recovery current originating from a rectifier circuit coupled to the controllable switching element during recovery of the rectifier circuit. The damage prevention circuit includes a reactive impedance circuit coupled in parallel with the rectifier circuit for controlling a reverse recovery current from the rectifier circuit during recovery of the rectifier circuit. A second controllable switching element is employed to direct the reverse recovery current to the reactive impedance circuit in response to recovery of the rectifier. The second controllable switch also directs the reverse recovery current from the reactive impedance circuit to a load, wherein the reverse recovery current may be safely diminished.