70results about How to "Power dissipation" patented technology

The present invention provides methods and apparatus for reducing power consumption. One method includes detecting the presence of an object, identifying whether the object is a valid device and restricting power if its not a valid device. Another method includes temporarily applying a low amount of power to the primary unit to detect a load, supplying more power to determine if its a valid secondary device, and restricting power if its not. An apparatus for reducing power consumption includes two power inputs, where the lower power input powers a sense circuit. A switch selectively decouples the higher power input from the primary subcircuit during detection mode and couples the higher power input to the primary subcircuit during power supply mode.

An eye tracker includes at least one illuminator for illuminating an eye, at least two cameras for imaging the eye, and a controller. The configuration of the reference illuminator(s) and cameras is such that, at least one camera is coaxial with a reference illuminator and at least one camera is non-coaxial with a reference illuminator. The controller is adapted to select one of the cameras to be active to maximize an image quality metric and avoid obscuring objects. The eye tracker is operable in a dual-camera mode to improve accuracy. A method and computer-program product for selecting a combination of an active reference illuminator from a number of reference illuminators, and an active camera from a plurality of cameras are provided.

A switching voltage regulator achieves high efficiency by automatically switching between a pulse frequency modulation (PFM) mode and a pulse-width modulation (PWM) mode. Switching between the modes of voltage regulation is accomplished by monitoring the output voltage and the output current, wherein the regulator operates in PFM mode at small output currents and in PWM mode at moderate to large output currents. PFM mode maintains a constant output voltage by forcing the switching device to skip cycles when the output voltage exceeds its nominal value. In PWM mode, a PWM signal having a variable duty cycle controls the switching device. A constant output voltage is maintained by feedback circuitry which alters the duty cycle of the PWM signal according to fluctuations in the output voltage.

This invention is a system and a method that uses the braking resistor, commonly used and available in electrically or hybrid-electrically propelled vehicles, to limit the precharge current during the startup of a high power ultracapacitor pack energy storage device and/or safely and rapidly discharge an ultracapacitor pack for maintenance work or storage to lengthen the life of the individual ultracapacitor cells and, correspondingly, the whole pack. The use of the braking resistor for precharging an ultracapacitor energy storage pack is an effective and less expensive method compared to other methods such as a separate DC-to-DC converter. This method includes the control logic sequence to activate and deactivate switching devices that perform the connections for the charging and discharging current paths.

A lighting system includes one or more methods and systems to control dissipation of excess power in the lighting system when the power into a switching power converter from a leading edge, phase-cut dimmer is greater than the power out of the switching power converter. In at least one embodiment, the lighting system includes a controller that controls dissipation of excess energy in the lighting system to prevent a premature disconnection of the phase-cut dimmer. In at least one embodiment, the controller actively controls power dissipation by generating one or more signals to actively and selectively control power dissipation in the lighting system. By actively and selectively controlling power dissipation in the lighting system, the controller intentionally dissipates power when the power into the lighting system should be greater than the power out to a lamp of the lighting system. In at least one embodiment, the controller creates one or more intermixed and/or interspersed power dissipation phases with one or more switching power converter charging and/or flyback phases.

An instruction fetch apparatus is disclosed which includes: a detection state setting section configured to set the execution state of a program of which an instruction prefetch timing is to be detected; a program execution state generation section configured to generate the current execution state of the program; an instruction prefetch timing detection section configured to detect the instruction prefetch timing in the case of a match between the current execution state of the program and the set execution state thereof upon comparison therebetween; and an instruction prefetch section configured to prefetch the next instruction upon detection of the instruction prefetch timing.

A device to measure a passive intermodulation (PIM) creating component is provided that uses minimal average power. For a PIM measurement, two separate signals F1 and F2 are generated to simulate signals, such as from two different types of cell phone operating bands being transmitted in the same area or two different transmit frequencies within one cell phone operating band. PIMs are measured to assure interference is not created on one of the cell phone bands. Minimal power is used by connecting pulse width modulators (PWM) to provide DC power to the high power amplifiers (HPA) creating the signals F1 and F2. By controlling the duty cycle of the PWM to limit ON time of the HPAs to approximately 10%, significant average power savings occur. Size is also reduced with reduced power consumption because heat sinks and other cooling components are not required.

A computer system 10 with one or more processors 12 can be configured to operate in any one of a number of thermal environments. A setting system 14 sets operating parameters of the computer system such as processor operating voltage and frequency. A selecting system 16 selects values of operating parameters for use in setting by responding to an input of configuring data 20 to select a set of parameter values from a parameter value storage memory 18. The configuring data 20 may be input by the insertion of a smart card 58. Such configuring is useful in adapting computer systems during manufacture for compliance with desired specifications without hardware modification.

A polar transmitter for an RFID reader and a system using the polar transmitter are disclosed. An RFID system according to at least some embodiments of the invention includes a polar transmitter employing a switch mode power amplifier. The system can also include a receiver to receive responses from RFID tags and a coupler connected to the polar transmitter, the receiver and one or more antennas. In at least some embodiments, the polar transmitter of the RFID system includes an envelope amplifier connected to the switch mode power amplifier to provide an envelope signal and a phase modulator connected to the switch mode power amplifier to phase modulate the switch mode power amplifier using a phase signal. In at least some embodiments, the polar transmitter of the RFID system transmits OPR-ASK signals to reduce AM modulation depth and provide a continuous phase signal for the phase modulator.

A volatile memory array using vertical thyristors is disclosed together with methods of fabricating the array.

Apparatus is used in sensing a measured input. The apparatus includes a capacitor with a capacitance that varies non-linearly in response to the measured input, and a circuitry that derives, from the capacitance, a signal that varies substantially linearly with the measured input. The capacitor includes a first electrode, a second electrode, and a gap defined by a space between the electrode. The circuitry includes an amplifier with a first input terminal in electrical communication with the first electrode, a second input terminal, and an output terminal in electrical communication with the second electrode. The capacitance of the capacitor varies as an inverse of the gap of the capacitor, the gap of the capacitor varies in response to changes in the measured input, and the signal is derived from an output of the amplifier.

The present inventors have recognized that proper utilization of reconfigurable event driven hardware may achieve optimum power conservation in energy constrained environments including a low power general purpose primary processor and one or more electronic sensors. Aspects of neurobiology and neuroscience, for example, may be utilized to provide such reconfigurable event driven hardware, thereby achieving energy-efficient continuous sensing and signature reporting in conjunction with the one or more electronic sensors while the primary processor enters a low power consumption mode. Such hardware is event driven and operates with extremely low energy requirements.

In a two-level virtual machine system having child VMMs operating on a parent VMM, the field update frequency of VMCS and VMCB which control a VMM assist function of a CPU is not uniform. A G field requiring reflection of emulation results is higher in update frequency than a C field. The semiconductor quantity and power dissipation caused by the assist function expansion tend to increase in the C field used for a condition decision as compared with the G field simply retaining a value because influence upon the CPU operation is greater in the C field. Therefore, events relating to the G field which is high in update frequency and less in increase of semiconductor quantity and power dissipation caused by the assist function expansion are coped with by the CPU with its assist function expanded. Events relating to the C field are coped with by the parent VMM.

A composite material containing inclusions of spherical shells in which each spherical shell encapsulates a rubber core with ferrite loading. The inclusions are embedded in a matrix material of syntactic foam. The spherical shells are made from glass and therefore acoustically transparent and in combination with the cores are statically stiffer than the surrounding matrix material. The composite material with the matrix material and inclusions allows the composite material to be acoustically dissipating with a stiffness in which the energy of forces associated with undersea platforms is resisted.

A digital direct access arrangement (DAA) circuitry may be used to terminate the telephone connections at the user's end that provides a communication path for signals to and from the phone lines. Briefly described, the DAA provides a programmable means for the DC termination for a variety of international phone standards. The invention may also be utilized with means for transmitting and receiving a signal across a capacitive isolation barrier. More particularly, a DC holding circuit is provided in which a programmable DC current limiting mode is available. In the current limiting mode, power may be dissipated in devices external to a DAA integrated circuit. Moreover, much of the power may be dissipated in external passive devices, such as resistors.

A domino read bit line structure (20) integral to an SRAM array (1, 2) with thirty-two word lines or less to access SRAM cells divided into two groups (3, 4, 90, 100) is described. The bit line structure (20) includes a dynamic bit decode multiplexer (11, 40) and two NAND circuits (5, 80) used to combine the two groups (3, 4, 90, 100), wherein in order to reduce power consumption the two NANDS (80) drive the dynamic bit decode multiplexer (40) directly, such that true and complement dynamic outputs (rt, rc) drive a set-reset latch (50) to convert the dynamic outputs (rt, rc) to a single static signal (doc), wherein the output of the set-reset latch (50) is already static so that the set-reset latch (50) acts as an effective array output latch (7).

Embodiments are disclosed of a multi-chip apparatus capable of performing multi-rate synchronous communication between component chips. Each chip may receive a common clock reference signal, and may generate an internal clock signal dependent on the clock reference signal. A clock distribution tree and phase-locked loop may be used to minimize internal clock skew at I/O circuitry at the chip perimeter. Each chip may also generate an internal synchronizing signal that is phase-aligned to the received clock reference signal. Each chip may use its respective synchronizing signal to synchronize multiple clock dividers that provide software-selectable reduced-frequency clock signals to the I/O cells of the chip. In this way, the reduced-frequency clock signals of the multiple chips are edge-aligned to the low-skew internal clock signals, and phase-aligned to the common clock reference signal, allowing the I/O cells of the multiple chips to perform synchronous communication at multiple rates with low clock skew.

Apparatus and methods are disclosed to measure airflow within a chassis-cooling pathway of an appliance. The rate of airflow is determined based on the differential heating among a pair of sensor devices, such as thermistors, transistors, diodes or resistive thermal devices operating at distinctly different power levels. The appliance utilizes the calculated airflow rate to perform safety-related tasks, such as de-energizing heating elements when low or no airflow is detected.

An audio signal processor which modifies audio signal components outside the conventional audio frequency band. The processor includes a Delta Sigma Modulator (DSM) that receives a non-interpolated digital audio signal sampled at a frequency of at least 198 kHz.

Disclosed below are representative embodiments of methods, apparatus, and systems used to generate test patterns for testing integrated circuits. Embodiments of the disclosed technology can be used to provide a low power test scheme and can be integrated with a variety of compression hardware architectures (e.g., an embedded deterministic test (“EDT”) environment). Certain embodiments of the disclosed technology can reduce the switching rates, and thus the power dissipation, in scan chains with no hardware modification. Other embodiments use specialized decompression hardware and compression techniques to achieve low power testing.