Abstract: A system (1-2) for efficiently transferring harvested vibration energy to a battery (6) includes a piezo harvester (2) generating an AC output voltage (VP(t)) and current (IPZ(t)) and an active rectifier (3) to produce a harvested DC voltage (Vhrv) and current (Ihrv) which charge a capacitance (C0). An enable circuit (17) causes a DC-DC converter (4) to be enabled, thereby discharging the capacitance into the converter, when a comparator (A0,A1) of the rectifier which controls switches (S1-S4) thereof detects a direction reversal of the AC output current (IPZ(t)). Another comparator (13) causes the enable circuit (17) to disable the converter (4) when the DC voltage exceeds a threshold (VREF), thereby causing the capacitance be recharged.

Abstract: Self-powered portable electronic devices are disclosed that have the capacity to generate their own electrical power, store electrical charge, and distribute electrical power to similarly designed devices in close proximity. Devices generate power in part using one or more non-solar thermal energy sources that have increased stability and efficiency compared to current solar cell powered devices. Devices comprise components including, control processors, data storage, energy storage, dedicated energy and power management processors, and thermophotovoltaic cells that convert thermal energy into electrical power. Devices are capable of transmitting and receiving energy, power, voice and data information using standard frequencies associated with portable devices. Additionally, the invention discloses methods, systems, and apparatuses comprising circuitry that can control power generation from multiple thermophotovoltaic cells and traditional power sources.

Abstract: The present inventions, in one aspect, are directed to techniques and/or circuitry to applying a current pulse to the terminals of the battery during a charge, measuring a voltage at the terminals of the battery, selecting a relationship of an open circuit voltage to an amount of charge in the battery using data which is representative of a state of health of the battery, calculating an open circuit voltage of the battery using the voltage measured at the terminals of the battery, a current applied to or removed from the battery and an impedance of the battery, and determining a state of charge of the battery using (i) the calculated open circuit voltage and (ii) the relationship of the open circuit voltage to the amount of charge.

Abstract: Some demonstrative embodiments include apparatuses, systems and/or methods of wireless power transfer. For example, a Wireless Power Receiver (WPR) may include a rectifier to convert a wireless charging signal received from Wireless Power Transmitter (WPT into a Direct Current (DC) power signal; a voltage regulator to regulate a voltage of the DC power signal according to a voltage range; a bypass path to bypass the voltage regulator; and a bypass controller to select between directing the DC power signal to the voltage regulator or to the bypass path, based on a voltage level of the DC power signal and the voltage range.

Abstract: A technology for a wireless transfer station that is operable to wirelessly provide energy to other wireless transfer stations. A wireless transfer request can be received from one or more of the other wireless transfer stations to receive wireless energy from the wireless transfer station. A transferring of wireless energy to the one or more of the other wireless transfer stations can be prioritized using selected energy transfer priority criteria. Wireless energy can be provided to the one or more of the other wireless transfer stations based on the prioritization.

Abstract: A method for providing control power for an electricity network in which at least one energy store connected to the electricity network supplies energy to the electricity network as required and/or takes up energy from the electricity network as required, the control power being delivered in dependence on a frequency deviation from a setpoint value of a network frequency, a tolerance with respect to the frequency deviation being used to set a charging state of the energy store at a same time as providing the control power by the energy store. A device for carrying out such a method includes a control system and an energy store, the device being connected or connectable to an electricity network, the control system being connected to the energy store and controlling the control power that is given off and/or taken up by the energy store.

Abstract: An electrical combination. The combination comprises a hand held power tool, a battery pack and a controller. The battery pack includes a battery pack housing connectable to and supportable by the hand held power tool, a plurality of battery cells supported by the battery pack housing, each of the plurality of battery cells having a lithium-based chemistry, being individually tapped and having an individual state of charge. A communication path is provided by a battery pack sense terminal and a power tool sense terminal. The controller is operable to monitor a state of charge of a number of battery cells less than the plurality of battery cells and to generate a signal based on the monitored state of charge of the number of battery cells less than the plurality of battery cells, the signal being operable to control the operation of the hand held power tool.

Abstract: A device is provided for monitoring the total current discharged from a battery. The device includes a bridge circuit of resistors in which one of the resistors has a resistance which varies according to the current which has passed through it. Whenever the battery passes a current to a load, a small portion of the current is passed through the bridge circuit.

Abstract: The voltage measuring apparatus is connected to a plurality of battery cells connected to each other in series to measure respective voltages of the battery cells. The voltage measuring apparatus includes a sample/hold amplifier configured to sample and hold positive electrode and negative electrode voltages of the battery cells to generate first and second output voltages, a differential voltage converter configured to generate a battery cell voltage according to a voltage difference between a positive input terminal and a negative input terminal, and a switching unit configured to control the first and second output voltages and connection between the positive input terminal and the negative input terminal so that a polarity of the voltage difference is constant. The sample/hold amplifier electrically insulates the switching unit from the battery cells.

Abstract: A voltage measuring apparatus is configured to measure voltages of respective battery cells of a battery cell array including a plurality of battery cell groups each including a predetermined number of battery cells connected in series. The voltage measuring apparatus includes a plurality of measuring units each provided for each of the battery cell groups. The adjacent measuring units are connected through a communication channel so as to perform current communication therebetween. A bidirectional diode circuit element is connected to the communication channel extending between the adjacent measuring units.

Abstract: Provided is a highly safe battery device in which the accuracy of an overcurrent detection current value is high. A charge and discharge control circuit includes an overcurrent detecting terminal, an overcurrent detecting circuit for detecting overcurrent of a secondary battery, the overcurrent detecting circuit being connected to the overcurrent detecting terminal, and a constant current circuit for causing a current to flow to the overcurrent detecting terminal.

Abstract: A power management system for a vehicle having wheels and an electric machine operable to provide torque to drive at least one of the wheels includes a first energy storage system capable of supplying power to operate the electric machine. The system also includes a second energy storage system capable of supplying power directly to at least one vehicle load at a lower voltage than the first energy storage system. A voltage conversion device is operable to reduce a voltage of the power supplied by the first energy storage system to the lower voltage to charge the second energy storage system when the vehicle is in a key-off state.

Abstract: A storage battery control apparatus includes: a storage battery state detection unit which obtains a remaining SOC which is an SOC of a storage battery at the start of a supply and demand control period; an offset power value determination unit which determines an offset power value that is a power value indicating charge or discharge; an adjustment instruction value obtainment unit which obtains an adjustment instruction value indicating a state of charge and discharge of the storage battery; and a charge and discharge control unit which performs control of discharging power from the storage battery to the grid or charging power from the grid to the storage battery, the power having a magnitude of a first power value which is a power value obtained by adding the offset power value to the adjustment instruction power value indicated by the adjustment instruction value.

Abstract: A device to determine a state of a battery is disclosed. One or more transistors provide a resistance between first and second nodes. The one or more transistors are configured to conduct a supply current from a battery between the first node and the second node. A measurement circuit measures the voltage generated between the first node and the second node. The measurement circuit further measures the supply voltage. A calculation circuit generates an estimate of the supply current based on the voltage measured between the first node and the second node and the resistance of the one or more transistors. The calculation circuit generates an estimate of the state of charge of the battery based on the measured supply voltage and the estimate of the supply current.

Abstract: Methods and apparatuses for transmitting charging power wirelessly are provided. One implementation includes an apparatus for transmitting charging power wirelessly to a vehicle. The apparatus comprises a transmit circuit configured to transfer wireless charging power to the vehicle via a wireless field. The apparatus comprises a controller configured to detect transmission of a wireless vehicle signal having a transmission period and indicative of operation of a vehicle communication system. The controller is configured to cause the transmit circuit to reduce a level of charging power within a first portion of the transmission period. A second, remaining portion of the transmission period is of sufficient duration for allowing identification of the wireless vehicle signal by a receiver of the wireless vehicle signal. The wireless vehicle signal comprises a plurality of pulses. At least one pulse is transmitted within the first portion.

Abstract: Provided are an electric automobile to which a power supply device supplies power, and an electricity supply system capable of accurately associating the power supply device and the electric automobile carrying out communication therewith. A power supply-side control unit (24) controls such that electricity that a power supply unit (21) supplies reaches a first electricity quantity Pa before a power supply-side communications unit (23) receives a request signal from a vehicle-side communications unit (43), and controls such that electricity that the power supply unit (21) supplies reaches a second electricity quantity Pb, which is greater than the first electricity quantity Pa, after the power supply-side communications unit (23) receives the request signal from the vehicle-side communications unit (43). The vehicle-side communications unit (43) activates on the basis of the first electricity quantity Pa received from the power supply unit (21) of a power supply device (2).

Abstract: The present invention employs more than two secondary batteries; most output of one battery is supplied to load, and rest output is used to charge another battery for improving the battery efficiency and prolong the battery usable time (discharge time). The object of the present invention is to provide a power supplying device and battery mode switching method by using the secondary battery cells.

Abstract: A terminal device includes: a tilt sensor that detects a tilt; a communication unit that transmits a signal according to the tilt detected by the tilt sensor; and a display unit that displays a status of charging performed according to the tilt detected by the tilt sensor.

Abstract: An autonomous power supply system includes a generation control circuit which controls power generation efficiency of a power generation element, a group of storage elements for charging electric power generated by the power generation element, and a charging control circuit which controls a charging operation and a discharging operation of the storage element group. The storage element group includes a primary storage element for supplying electric power to the generation control circuit and the charging control circuit, and secondary storage elements for supplying electric power to a loading device. The electric power generated by the power generation element charges the primary storage element preferentially, and the secondary storage elements subsequent to the primary storage element. A capacity value of the primary storage element is set to be smaller than a capacity value of the secondary storage elements.

Abstract: A thermally shielded receptacle for a rechargeable battery. The thermally shielded receptacle can include a material having a heat deflection rate of greater than 50 degrees Celsius to contain a catastrophic runaway of one or more of a plurality of individual battery cells. The thermally shielded receptacle can include material sized and shaped to receive the plurality of individual battery cells and separate each of the plurality of individual battery cells from adjacent individual battery cells.