282results about How to "Reduce unnecessary power consumption" patented technology

An apparatus and method for performing SIMD multiply-accumulate operations includes SIMD data processing circuitry responsive to control signals to perform data processing operations in parallel on multiple data elements. Instruction decoder circuitry is coupled to the SIMD data processing circuitry and is responsive to program instructions to generate the required control signals. The instruction decoder circuitry is responsive to a single instruction (referred to herein as a repeating multiply-accumulate instruction) having as input operands a first vector of input data elements, a second vector of coefficient data elements, and a scalar value indicative of a plurality of iterations required, to generate control signals to control the SIMD processing circuitry. In response to those control signals, the SIMD data processing circuitry performs the plurality of iterations of a multiply-accumulate process, each iteration involving performance of N multiply-accumulate operations in parallel in order to produce N multiply-accumulate data elements. For each iteration, the SIMD data processing circuitry determines N input data elements from said first vector and a single coefficient data element from the second vector to be multiplied with each of the N input data elements. The N multiply-accumulate data elements produced in a final iteration of the multiply-accumulate process are then used to produce N multiply-accumulate results. This mechanism provides a particularly energy efficient mechanism for performing SIMD multiply-accumulate operations, as for example are required for FIR filter processes.

By the vehicle controller of the present invention, when the economy mode is selected by a driver, boosting by a converter is limited and output torque of a motor is limited. Even in the economy mode, however, if the driver requests large torque, either the limit on boosting or the limit on output torque is cancelled. As a result, a vehicle controller for a vehicle including a battery, a converter boosting / lowering the battery voltage and a motor operating with the power from the converter is provided, by which unnecessary power consumption is reduced and the torque requested by the driver can be generated.

Disclosed is a variable power dimming control circuit for driving and linearly adjusting the illumination brightness of a plurality of light emitting diodes (LEDs), and the circuit includes a dimming stabilization unit and a control unit. The control unit is provided for detecting an input current of a circuit, and the dimming stabilization unit is driven for outputting a holding current when the input power is smaller than a standard, and stopping the output the holding current when the input power is greater than the standard. When the LEDs are dimmed to low luminance, a chip controls the operation of the dimming stabilization unit to assure the stability of the dimming operation of a TRIAC. When the LEDs are adjusted to high or full brightness, the chip stops the output of the holding current to reduce unnecessary power consumption and enhance the overall circuit performance effectively.

This disclosure relates generally to low power data decoding, and more particularly to low power iterative decoders for data encoded with a low-density parity check (LDPC) encoder. Systems and methods are disclosed in which a low-power syndrome check may be performed in the first iteration or part of the first iteration during the process of decoding a LDPC code in an LDPC decoder. Systems and methods are also disclosed in which a control over the precision of messages sent or received and / or a change in the scaling of these messages may be implemented in the LDPC decoder. The low-power techniques described herein may reduce power consumption without a substantial decrease in performance of the applications that make use of LDPC codes or the devices that make use of low-power LDPC decoders.

The present invention discloses a wearing state detection method of a wearable device and a wearable device. The method includes the following steps that: a sensor is arranged in a region of the wearable device that contacts with the skin of a user, measured values which are outputted by the sensor when the user wears and removes the wearable device are different; a reference value which can indicate whether the wearable device is worn or not is obtained; after wearing detection is started, the measured values are acquired from the sensor according to a preset sampling frequency; whether the wearable device is in a worn state currently is judged based on the measured values and the reference value; and when the wearable device is in a non-worn state, the wearable device is controlled to turn off corresponding functions which are operating. With the wearing state detection method of the wearable device of the invention adopted, the accuracy of the result of wearing detection is high; unnecessary power consumption of the wearable device can be decreased as much as possible, and the comfort of use of the device can be improved; when the wearable device is removed, the corresponding functions of the wearable device that are operating can be automatically stopped without the manual operation of the user required, and therefore, high intelligence can be realized; and the use needs of the wearable device can be satisfied.

The present invention is intended to reduce unnecessary power consumption by controlling disconnection of entries unused in a translation lookaside buffer (TLB) for a long time. In an aspect of the present invention, there is provided a method of controlling electric power consumed for a translation lookaside buffer (TLB) within a central processing device having the TLB and an entry replacement mechanism wherein the TLB includes a plurality of entries and performs translation from a logical address to a physical address and the entry replacement mechanism replaces the entries of the TLB, the method including the steps of: selecting one or more entries among the plurality of entries of the TLB in accordance with one or more predefined criteria based on an output from the entry replacement mechanism, and controlling electric power supplied to the selected entries.

Provided is a low-power ZigBee device provided with a sleeping mode and an active mode including a power supplying unit for supplying a power; a Medium Access Control (MAC) processing unit for receiving a wake-up packet and for controlling a modem unit and an Radio Frequency (RF) unit; and a Central Processing Unit (CPU) for receiving and processing a data packet, wherein the MAC processing unit makes the power supplying unit apply a power to the CPU based on a result of checking an identification (ID) of the wake-up packet.

An image forming apparatus is provided with a receiving portion receiving an authenticated print job, a storage portion storing image data of the authenticated print job thus received, an authentication information determination portion performing authentication based on an operation performed by the user, and a printer printing an image based on the image data stored in the storage portion when the user has been authenticated. When the operation mode is set to the power-saving mode, the power controller changes the operation mode from the power-saving mode to the power-saving print mode without changing the operation mode from the power-saving mode to the normal standby mode after the user has been authenticated and before the printer performs printing, and the power controller returns the operation mode from the power-saving print mode to the power-saving mode after the printer has performed the printing.

An LED driver according to the present invention feeds an electric power to an LED circuit, which is either of a single LED or a plurality of LEDs serially connected together. The LED driver includes: a constant current circuit part serially connected to the LED circuit and adjusting a current flowing from an upstream to a downstream side thereof to a predetermined value; and a voltage adjustment part serially connected to the constant current circuit part and adjusting a potential difference between the upstream and downstream sides with a switching regulator. This therefore permits providing an LED driver capable of, while adopting a constant current driving method using a constant current circuit, easily minimizing unnecessary power consumption and respecting the permitted loss at the constant current circuit.

Aspects of the invention are intended to stabilize the initial state of an active matrix so as to reduce unnecessary power consumption and stabilize the operation. The driving device can include a selection device that is coupled to any of a plurality of row direction lines and any of a plurality of column direction lines, and by which a selected state and a non-selected state of the row direction lines or the column direction lines are switched to each other. The driving device can also include a device that switches to the non-selected state that switches the selection device coupled to the row direction lines or the selection device coupled to the column direction lines to a non-selected state. Selection by the selection device can be implemented after the selection device is switched to a non-selected state by the device that switches to the non-selected state.

A wireless communication circuit in accordance with the present invention, is the wireless communication circuit having an amplifier for amplifying a signal, includes an amplification route in which the signal passes through the amplifier; a bypass route for bypassing the amplifier; and a route-selector for selecting one of the amplification route and the bypass route. This arrangement prevents an amplification of a signal, being transmitted or being received, when a communication counterpart is in a close distance, thereby reducing an unnecessary power consumption.

A deep power down control circuit includes a deep power down switch unit to separate an external power voltage line from a selected one of a plurality of internal power voltage lines according to a deep power down signal, a deep power down discharge unit for connecting the plurality of internal power voltage lines to a ground voltage line and to discharge them to a ground voltage level according to the deep power down signal. The deep power down control circuit also includes a deep power down signal generating unit control according to a bank active detect signal and a burst end command, to output the deep power down signal by using a clock enable signal. The deep power down control circuit connects the plurality of internal power voltage lines to the ground voltage line, and thus prevents floating to remove the possibility of inversion of the power voltage or generation of the latch-up. Moreover, the deep power down control circuit prevents leakage current by a micro bridge among the plurality of internal power voltage lines.

A positional information determining apparatus capable of reducing power consumption markedly in simple structure in radio transmission of positioning results to a navigation device. Satellite waves S1 to S4 are received from a plurality of GPS satellites 2 to 5 and analyzed at prescribed time intervals, thus obtaining positional data D5 denoting own current position. Only when positional data D5 can be determined, the positional data D5 is transmitted by radio to the navigation device that uses the positional data D5. Thus it is made possible to reduce power consumption with certainty because radio transmission is made only when positional data D5 can be obtained.

Disclosed are a method and an apparatus for power saving mode operation in a wireless LAN. A method, for operating a power saving mode in a wireless LAN, can comprises the steps of: an AP transmitting, on the basis of a virtual bitmap of a TIM element comprised in a beacon frame, a PS-poll request frame to a plurality of target STAs that have received the indication of the existence of pended downlink data; the AP receiving, on overlapped time resources, each of a plurality of PS-poll frames from each of a plurality of PS-poll transmission STAs that are indicated on the basis of the PS-poll request frame among the plurality of target STAs; and the AP, on the overlapped time resources, transmitting each of a plurality of downlink frames to each of the plurality of PS-poll transmission STAs as a response to each of the plurality of PS-poll frames.

An image processing apparatus comprises a first detecting unit configured to detect an object, a power control unit configured to shift the image processing apparatus from a second power state to a first power state which consumes more power than the second power state when the first detecting unit detects an object, and a second detecting unit configured to detect a sheet ejected to a sheet ejecting unit. The power control unit does not shift the image processing apparatus to the first power state when the second detecting unit no longer detects the sheet before a lapse of a predetermined period of time after the first detecting unit detects an object. The power control unit shifts the image processing apparatus to the first power state when the second detecting unit detects the sheet before a lapse of the predetermined period of time after the first detecting unit detects an object.

Disclosed is a variable power dimming control circuit for driving and linearly adjusting the illumination brightness of a plurality of light emitting diodes (LEDs), and the circuit includes a dimming stabilization unit and a control unit. The control unit is provided for detecting an input current of a circuit, and the dimming stabilization unit is driven for outputting a holding current when the input power is smaller than a standard, and stopping the output the holding current when the input power is greater than the standard. When the LEDs are dimmed to low luminance, a chip controls the operation of the dimming stabilization unit to assure the stability of the dimming operation of a TRIAC. When the LEDs are adjusted to high or full brightness, the chip stops the output of the holding current to reduce unnecessary power consumption and enhance the overall circuit performance effectively.

An electronic shelf label system includes a plurality of electronic shelf labels, plurality of transmitters, and a transmission controller. The transmission controller divides the transmitters into a plurality of communication groups so that each of the communication groups has a collective communication area including at least one of the transmitters, and to control the transmitters in units of the communication groups. The transmission controller also controls all of the transmitters included in one of the communication group, which is determined based on input of position specification information for specifying a position of a worker who is utilizing a portable information processing device, to cause product information of a target product to be transmitted to a target electronic shelf label by one of the transmitters that belongs to the communication group.

A multi-channel current steering DAC (Digital-to-Analog Converter), for example, a 2-channel current steering DAC, includes a plurality of current sources I1, I2, . . . corresponding to the number of bits of a digital input signal DS in each of channels A, B. Each of the plurality of current sources I1, I2, . . . is formed by two small-current sources (I11, I12), (I21, I22), . . . . In the case where a full-scale current is limited to a small value in any of the channels, one of the two divided current sources is turned off by switches Sa1, Sa2. Accordingly, a full-scale current of each channel can be adjusted with a common bias circuit without degrading the resolution.

Disclosed is a method for reducing power consumption of a user terminal when synchronization between a user terminal and a base station is disrupted in a broadband wireless access communication system. The method comprises the steps of: calculating first error rate (E) based on first channel state information included in a signal transmitted from the base station; comparing the first error rate (E) with a first threshold value; determining that the synchronization is disrupted and maintaining a transmission-off mode for a predetermined period of time if the first error rate (E) is greater than the first threshold value; maintaining a reception-on mode during a period of time set for a reception mode after the transmission-off mode is performed; receiving from the base station second channel state information during the reception-on mode; calculating a second error rate (E1) based on the second channel state information; comparing the second error rate (E1) with a second threshold value; and determining that the synchronization has been reestablished and maintaining the transmission mode in a transmission-on mode if the second error rate (E1) is less than the second threshold value.

The present invention discloses a light emitting device power supply circuit, a light emitting device driver circuit and a control method thereof. The light emitting device driver circuit is coupled to a tri-electrode AC switch (TRIAC) dimmer circuit, and it controls the brightness of a light emitting device circuit according a rectified dimming signal. The light emitting device driver circuit includes a power stage circuit and a light emitting device control circuit. The light emitting device control circuit generates a switch control signal. The power stage circuit operates at least one power switch thereof according to the switch control signal to generate a latching current for firing the TRIAC dimmer circuit, and the latching current is inputted to the light emitting device circuit.

A wireless communication circuit in accordance with the present invention, is the wireless communication circuit having an amplifier for amplifying a signal, includes an amplification route in which the signal passes through the amplifier; a bypass route for bypassing the amplifier; and a route-selector for selecting one of the amplification route and the bypass route. This arrangement prevents an amplification of a signal, being transmitted or being received, when a communication counterpart is in a close distance, thereby reducing an unnecessary power consumption.

An active bleeder according to an exemplary embodiment of the present invention includes a bleed switch coupled to the input voltage and an active bleeding controller generating a bleed reference voltage according to a result of counting a period during which the input voltage is generated and switching the bleed switch according to a result of comparison between the bleed reference voltage and a bleed sense voltage corresponding to a current flowing to the bleed switch.

A method for reducing power consumption in a wireless sensor network is provided. An optimized path destined for a sink node is set using a common channel in which first and second nodes use a CSMA scheme. A first channel is set and transmission / reception slots for packet transmission / reception arc allocated in the first channel. A packet is transmitted to the second node through a first transmission slot using a TDMA scheme. When a packet is not received from the second node through a first reception slot within a first set amount of time, the first reception slot is allowed to transition to an inactive state. The first node is one of the sink node, at least one parent node, and at least one child node of the parent node, and the second node is one of child nodes of the first node.

Disclosed are a method for transmitting and receiving a power outage report and a device therefor. According to the present invention, a method for allowing a machine to machine (M2M) device to transmit a power outage report comprises a step of transmitting, to a base station, a first message which contains a bandwidth request (BR) index value defined in advance if a power outage occurs, wherein said BR index value defined in advance is allocated to indicate to said M2M device that the power outage has occurred.

Disclosed herein is an adaptive communication method of a base station in a moving wireless backhaul network, including: acquiring frame transmitting / receiving timings of a terminal; periodically searching for a terminal synchronous signal transmitted from the terminal; if the terminal synchronous signal is detected, estimating the frame transmitting / receiving timings of the base station to / from the terminal based on the terminal synchronous signal and the frame transmitting / receiving timings of the terminal; and transmitting the base station synchronous signal to the terminal based on the frame transmitting / receiving timings of the base station.

A method for dynamically adjusting central processing unit (CPU) frequency. Firstly, a translation table is provided between multilayer of CPU usage percentage and front-end bus operation frequency. Secondly, a current usage percentage of the CPU is obtained. Lastly, the operation frequency of the front-end bus is adjusted to a corresponding layer according to the current usage rage, so that the current usage rage is located within the range of CPU usage percentage that is defined by corresponding layer.

A display panel of an image display device including data lines for transmitting data voltages representing image signals, scan lines for transmitting select signals, and pixel circuits coupled to the data and scan lines. The pixel circuit includes a driver for outputting a current corresponding to a data voltage applied from the data line, and a display element for displaying an image corresponding to an amount of the current outputted by the driver. A first switch transmits the data voltage to the driver in response to a select signal, and a second switch transmits a precharge voltage to the driver in response to a first control signal. The value of the precharge voltage during a period in which the first control signal is applied to the second switch is different from the value of the precharge voltage during other periods.

A portable terminal and a method for scanning Access Points (APs) to perform the AP scan with low power consumption in a sleep mode are provided. The method includes checking whether a sleep mode entry request is detected in a state that a short range radio communication function is activated, transmitting, when the sleep mode entry request is detected, an access point list and a setup command for handing over an access point scan control from a control unit to a short range radio communication module, adjusting a scan period according to a motion of the portable terminal based on the access point list and the setup command, and scanning, at the short range radio communication module, access points at the adjusted scan period.

An illumination device includes a light emitting unit; and a lighting circuit, to which the light emitting unit is installed, for supplying an output voltage to the light emitting unit. The light emitting unit includes a light emitting element which is connected to an output terminal of the lighting circuit and emits light by the output voltage supplied from the lighting circuit; and a current limiting unit which limits a current flowing into the light emitting element portion from the lighting circuit at the time when the light emitting unit is installed to the lighting circuit.