178results about How to "Shortened battery life" patented technology

To prevent a battery from being over-discharged and to thus improve a cycle life of the battery, a microcomputer electrically interrupts connection between the battery and a cordless power tool to compulsorily stop driving the tool when the battery voltage has become equal to or fallen below a first predetermined value. Also, to enable an operator to know that the battery is in a near over-discharge condition, the microcomputer performs a switching control of a load current when the battery voltage is above the first predetermined voltage but has become equal to or falls below the second predetermined voltage. As a result, the rotation of the motor of the tool goes abruptly slow down or the motor rotates in an irregular fashion, whereby the operator recognizes that the battery is in a charge-need condition.

Electrical devices (e.g., cardiac rhythm management and neurostimulation devices) for contact with tissue are used in combination with an anti-scarring agent (e.g., a cell cycle inhibitor) in order to inhibit scarring that may otherwise occur when the devices are implanted within an animal.

Provided is a sensor node including: a sensor for measuring biological information; a CPU for acquiring data by driving the sensor; a wireless communication unit for transmitting the data acquired by the CPU; a battery for supplying the control unit, the wireless communication unit, and the sensor with electric power; a RAM for storing the data; a compression unit for compressing the data stored in the RAM when the wireless communication unit cannot carry out the transmission; and a flash memory for storing the compressed data, thereby storing as much sensing data as possible on the sensor node, which is limited in resources, and preventing loss of the sensing data.

A multi-channel remote keyless entry (RKE) transponder having dynamically re-configurable input channel selection, channel disable, settable sensitivity for each channel, wake-up filter timing parameters, automatic gain control hold, internal tuning capacitor selection for each channel's antenna, minimum modulation depth requirement for input signal and bi-directional talk-back. Programmable minimum modulation depth requirement reduces false wake-up of the RKE transponder. An antenna for each channel of the RKE transponder may be tuned with internal tuning capacitors for improved range and receiver sensitivity. The internal tuning capacitor parameters may be stored in a configuration register. Gain of the channel may be fixed while the antenna is tuned. The antennas may be de-queued for talk-back to a base station for low frequency bi-directional communications. An external control device may dynamically read from and write to the configuration registers via a serial communications interface.

An adaptive wakeup methodology may be implemented to allow an radio frequency identification (RFID) tag to stay synchronized with periodic radio frequency (RF) interrogator polling signal while at the same time optimizing power consumption. A receiver (or transceiver) component of a RFID tag may only be operated when an interrogator polling signal is expected, and in a manner that reduces the amount of time between when the receiver or transceiver is turned on and when the interrogator polling signal is received (i.e., the receive buffer time). At other times, the RFID tag may be placed in a low power consumption sleep state. The amount of time that the RFID tag spends in such a low power sleep state before waking and receiving the following interrogator polling signal may also be optionally adjusted, e.g., to fit characteristics of a given situation and / or to re-synchronize a given aRFID tag with first band transmissions from an aRFIDI.

An LED lighting device is presented for both general illumination and emergency backup lighting. The device has an outer bulb shell with air vents to release heat. A metal threaded base is adapted to fit into a standard incandescent bulb socket and to allow electrical current to flow into the device. Housed within the outer bulb shell, and removably connecting the shell to the metal base is a lighting assembly. The lighting assembly is a cylindrical structure comprising bright LEDs arranged along its outer surface, some of which are powered via wall outlet power from the metal base of the device, while others utilize an internal battery power source housed within the assembly. The battery powered LEDs may be remotely activated by a remote control means. Use of the remote control sends a signal to a signal receiving means on or within the device that directs the backup LEDs to illuminate.

A bidirectional remote keyless entry (RKE) transponder comprises an analog front-end (AFE) having a programmable wake-up filter that predefines the waveform timing of the desired input signal, minimum modulation depth requirement of input signal, and independently controllable channel gain reduction of each of its three channels, X, Y, and Z. The wake-up filter parameters are the length of high and low durations of wake-up pulses that may be programmed in a configuration register. The wake-up filter allows the AFE to output demodulated data if the input signal meets its wake-up filter requirement, but does not output the demodulated data otherwise. The AFE output pin is typically connected to an external device for control, such as a microcontroller (MCU). The external device typically stays in low current sleep (or standby) mode when the AFE has no output and switches to high current wake-up (or active) mode when the AFE has output. Therefore, in order to keep the external control device in the low current sleep mode when there is no desired input signal, it is necessary to keep no output at the AFE output pin. This can be achieved by controlling the wake-up filter parameters, minimum modulation depth requirement of input signal, and channel gains of the AFE device. These features can reduce false-wake up of the bidirectional RKE transponder due to undesired input signals such as noise signals.

A method is disclosed of estimating significant places visited by a mobile-terminal user for wireless communication via base stations. The method includes: collecting at least one communication log represented with consecutive communication events between the mobile terminal and connected one of the base stations in a coverage area of each mobile terminal, the base stations being identified by unique base-station identifiers (BS IDs), respectively, each communication event including date and time of communication and one of the BS IDs which is indicative of the connected base station; dividing each communication log into consecutive time-windowed segments, using a discrete time window moving in time; and, per each time-windowed segment, estimating at least one significant place visited by the user, based on a probability distribution with which the BS IDs appear in each time-windowed segment.

A remote keyless entry (RKE) transponder has a programmable selective wake-up filter for determining whether the RKE transponder should wake-up to process a received signal. The wake-up filter correlates the timing of an input signal's carrier amplitude on and off time periods to a predefined programmable time period profile for a desired signal which has a certain carrier on time (time period on) and a certain carrier off time (time period off) arranged into a coded “header.” When a received signal matches the predefined time period profile, then the RKE transponder will wake-up to process the incoming signal data. The predefined time period profile may be programmable and may be stored in a header configuration register. Each RKE transponder has unique predefined time period on and time period off profiles.

The present disclosure discloses a smart battery, an electric energy allocation bus system, a battery charging and discharging method and an electric energy allocation method. The smart battery internally comprises a battery body portion and a control unit. The smart battery can collect various data of the battery, can be communicated with other smart batteries in a battery pack of a same group and a battery pack control system, and can realize electric quantity transfer among smart batteries of the same group through the electric quantity allocation bus, and realize electric quantity transfer among some batteries of a battery pack accessed to the electric energy allocation bus. Besides, controllable processes of charging and discharging, that is, active balanced charging and discharging, can be realized.

A fuel cell is placed in parallel with a battery via a mechanical switch. The voltage is held nearly constant by the battery and the power flow is controlled by adjusting the fuel cell operating parameters (such as temperature or air flow) and by opening and closing the mechanical switch. The result is a system that operates at nearly constant voltage without the need for an expensive power conditioning system. The output of the system can then be processed via a traditional power conditioning system such as an inverter or dc-to-dc converter without the need for a wide range of input operating voltages. This reduces the cost and size of the fuel cell power conditioning system.

A local extremum of a function ƒ is determined by computing a Jacobian of ƒ at a test point x by adding an imaginary part to x and a Hessian of ƒ by adding two imaginary parts to a multicomplex copy of x and extracting a third imaginary part. Solving a system of equations defined by the Jacobian and Hessian yields a delta; the process is repeated until convergence. This method is used in each of a series of time intervals to compute an insulin-delivery amount for an insulin pump. ƒ is a model-predictive-control cost function; x is a set of successive candidate insulin delivery amounts beginning from a selected time interval. A system includes a glucose monitor and a controller using glucose measurement data therefrom to determine an insulin delivery amount for a time interval by minimizing ƒ; an insulin pump provides insulin corresponding to the delivery amount.

The battery life of batteries of a mobile device operating in a wireless network is optimized by dynamically changing symbol rates and bits per symbol and selecting one for communicating based upon the source providing power to the mobile device.

An improved multi-voltage power supply charges individual small capacitors to different voltages. Each small capacitor is assigned to a circuit, and is charged to a voltage level sufficient for the circuit. In one embodiment, an improved switching regulator includes a multiplicity of small capacitors. The small capacitors are assigned to stimulation channels of a stimulation system. Each channel has a unique compliance voltage which the assigned small capacitors are charged to. By charging the small capacitors to the corresponding compliance voltages, versus charging a single large capacitor to the maximum compliance voltage, unnecessary power dissipation is avoided. In another embodiment, a switched capacitor power supply benefits from the present invention in the same manner as the switching regulator power supply. Further, any system requiring a plurality of different voltages may benefit from the present invention.

A multi-spectral imaging device includes pixels R, G, B, λ1, λ2, . . . , λ12 composing color sensors for four or more colors having mutually differing spectral sensitivity characteristics. In a first signal readout mode, an image signal including all of four or more types of signals read from the pixels composing the color sensors for the four or more colors is read from the multi-spectral imaging device. In a second signal readout mode, an image signal having a smaller number of colors than that of the first signal readout mode is read such that a narrower gamut than a gamut that can be reproduced by the image signal read in the first signal readout mode is formed.

Disclosed is a laminate cell (1) comprising an electric power generating element (2) and a laminate film (7) so arranged as to surround the electric power generating element (2). The laminate cell (1) further comprises a frame member (10) which surrounds and holds the electric power generating element (2) and has a first portion (10f) with a thickness larger than that of the electric power generating element (2).

A protective case accessory with integrated Multifunction button configured for attachment to a cellular smartphone device, facilitating the initiation of embedded features or software applications, or both, when attached to the Smartphone device. The invention includes a Multifunction button integrated into a protective case accessory and preferably uses a Bluetooth transceiver to connect wirelessly to a smartphone device to send and receive audio or data communication, or both.

An electronic device has a reception unit that captures positioning information satellites and receives satellite signals transmitted from the captured positioning information satellites, a solar panel, and a reception control unit that controls the reception unit. The reception control unit includes an evaluation unit that evaluates the reception environment based on power generation by the solar panel, and a mode selection unit that, based on the result from the evaluation unit, selects a time information reception mode for receiving the satellite signals and acquiring time information, or a position and time information reception mode for receiving the satellite signals and acquiring positioning information and time information, and controls operation of the reception unit in the reception mode selected by the mode selection unit.

A method includes transmitting, from an electronic device in a neighbor awareness network (NAN) via a first wireless protocol, a wake up message indicating discovery information associated with a second wireless protocol. The method further includes communicating information via the NAN using the second wireless protocol after transmitting the wake up message.

An electric power tool includes a motor; a battery unit for supplying an electric power for driving the motor; a driving force transmission mechanism for transmitting a driving force of the motor; a manipulation unit for receiving input data including a rotation number and an on / off manipulation of the motor; a motor control unit for controlling the motor based on the input data from the manipulation unit; and a temperature sensor for detecting a temperature of the battery unit as a temperature value. If the temperature value detected by the temperature sensor while being operated in an normal operation mode is higher than or equal to a first abnormal temperature value, the motor control unit determines that the battery unit is in an abnormal state, and converts an operation mode of the motor to a limited operation mode in which a rotation of the motor is stopped or suppressed.

Provided is an electrode mix for a secondary battery containing an electrode active material, comprising a PVA having a degree of polymerization of more than 2500 and a degree of saponification of more than 90% as a binder, and a lithium secondary battery comprising the same. Use of the binder according to the present invention can provide advantageous effects such as improved adhesive strength between the electrode mix and current collector and between the electrode mixes, prevention of the peeling and separation of the active material even after repeated charge / discharge cycles, and inhibition of decreases in the capacity or output power retention rate of the secondary battery.

A wireless patient monitoring system employs room units to collect and display information from a variety of room based sensors, the latter of which may be battery-powered and have low range. The room units may relay collected data from the associated sensor units and, as identified to the room unit, to a central controller.

Systems and methods for data separation, which may be employed to receive and process RFID tag data in RF signal environments where multiple RFID tags are tracked, localized and / or employed to transmit information. The disclosed systems and methods may be implemented for data separation in a high density aRFID environment using RFID tags in combination with spatial and / or frequency separation.

According to various embodiments, an electronic device includes a housing configured to house a battery; a display configured to be disposed in the housing, to be exposed through a portion of the housing, and to be electrically connected to the battery; a motion detection sensor circuit configured to be disposed in the housing and to be electrically connected to the battery; a power management circuit configured to be disposed in the housing and to be electrically connected to the battery; and a processor configured to be functionally or electrically connected to the motion detection sensor circuit and the display and to be electrically connected to the power management circuit through a switch that is turned on when the processor is in a first mode and turned off when the processor is in a second mode, wherein, in the second mode, the motion detection sensor circuit detects a motion associated with the electronic device, and provides image data to the display in response to the detection of the motion. Other embodiments are also possible.

A remote keyless entry (RKE) transponder has a programmable selective wake-up filter for determining whether the RKE transponder should wake-up to process a received signal. The wake-up filter correlates the timing of an input signal's carrier amplitude on and off time periods to a predefined programmable time period profile for a desired signal which has a certain carrier on time (time period on) and a certain carrier off time (time period off) arranged into a coded “header.” When a received signal matches the predefined time period profile, then the RKE transponder will wake-up to process the incoming signal data. The predefined time period profile may be programmable and may be stored in a header configuration register. Each RKE transponder has unique predefined time period on and time period off profiles.

The present invention provides a cell cartridge with a composite cell interconnection network, in which plural unit cells are assembled and modularized in a case in a composite series-parallel connection manner. An object of the present invention is to provide a cell cartridge with a composite cell interconnection network, in which a plurality of unit cells can be simply assembled, as opposed to conventional methods of binding the unit cells with glass tape, for example, to shorten the time required for assembly, improve assemblability and productivity, and increase the accuracy of manufacturing standards. Moreover, another object of the present invention is to provide a cell cartridge with a composite cell interconnection network, in which a plurality of unit cells are spaced at regular intervals to prevent problems caused by direct contact between the cells and by heat generated thereby, prevent problems such as cell performance degradation and reduced battery lifespan caused by the direct contact and the generated heat, and enable mass production of standardized and modularized battery packs. Furthermore, still another object of the present invention is to provide a cell cartridge with a composite cell interconnection network, in which the structure of external terminals connected to cell terminals is modified to prevent a contact failure or excessive contact resistance between the cell terminals and the external terminals, and which can solve many other problems, caused by the welding of a nickel plate in conventional methods, such as welding defects, inconvenience of welding process, excessive assembly time due to the welding, degradation of assemblability and productivity, etc. To this end, a cell cartridge with a composite cell interconnection network is disclosed, the cell cartridge comprising: a plurality of unit cells; a case which accommodates the unit cells and is then assembled; a plurality of spacing members, each disposed between the unit cells accommodated in the case to space the unit cells a predetermined distance from each other; and a plurality of connection plates fixedly mounted on an inner side of the case and each including terminals connected to electrodes of the respective unit cells to connect the electrodes of adjacently arranged cells to each other, wherein the unit cells are connected to each other by the connection plates connected to the respective electrodes in a composite series-parallel connection manner.

A receiver assembly (16) includes an amplitude shift keyed mode (52) and a frequency shift keyed mode (58) selectively engagable to receive radio frequency transmissions from the tire monitoring system (26) and a remote keyless entry system (20) and switches between modes in response to receipt of a wake up pattern.