Abstract: A power-input stage (102) for a DC-powered device (100), the power-input stage including at least four pairs of power-input elements (104) for connecting to four pairs of external electrical conductors (106) for delivering DC power, and a powering-mode assessment unit (108) having a balance measurement stage (110) that is configured to perform a balance measurement for determining whether or not a first number of pairs of power-input elements, at which a positive power-supply voltage is available from the external electrical conductors, is equal to a second number of pairs of power-input elements, from which a negative power-supply voltage is available, and to provide a balance output signal indicative of a result of the balance measurement.

Abstract: A UPS system may include a DC UPS having first DC outputs coupled to a first switch and configured to provide a battery DC power signal or a first DC power signal to corresponding first loads, first load controllers each coupled between respective ones of the first DC outputs and the first switch, and a controller coupled to the first switch and a second switch, and the first load controllers. The controller may be configured to switch between a first mode where the first DC power signal is supplied to the first load controllers, and a second mode where the battery DC power signal is supplied to the first load controllers. The UPS system may include a cloud application server in communication with the DC UPS and configured to cause the controller to disable and enable the first load controllers.

Abstract: Methods, apparatus, systems and articles of manufacture are disclosed to start converter into a pre-biased voltage. The disclosed methods, apparatus, systems and articles of manufacture provide an apparatus comprising: an error amplifier including a feedback network and a differential difference amplifier (DDA), the DDA coupled to a power converter, a voltage generator, and the feedback network coupled to the third input of the DDA, the fourth input of the DDA, and the output of the DDA; a multiplexer coupled to the voltage generator, the second input of the DDA, and the first input of the DDA; a first switch coupled in parallel to the feedback network; a second switch coupled to a delay cell and an oscillator; and a trigger including an output, the trigger coupled to the voltage generator, the power converter, and the output of the trigger coupled to the multiplexer, first switch, and the second switch.

Abstract: A DC collection system for a PV power plant contains a large number of feeders. When a fault occurs, the fault current rapidly increases, causing electronic devices to block to protect themselves. This blockage presents a challenge to the protection of the DC collection system because of extremely short data windows. To address this challenge, a protection method based on active control of DC/DC converters is disclosed. The fault current control principle is analyzed and derived so that DC/DC converters can provide an injected low-amplitude and controllable post-fault stable current signal. The disclosed protection method is designed based on identifying the direction of the injected signal. Simulation results indicate that the fault section can be accurately identified and that the disclosed protection method performs efficiently against transition resistance and noise.

Abstract: A device includes a connection unit, a load unit, a voltage detection unit, and a determination unit. The connection unit is connected to a power supply apparatus. The load unit operates as a constant power load. The voltage detection unit detects a first output voltage of the power supply apparatus when the load unit operates in a first operation mode, and detects a second output voltage of the power supply apparatus when the load unit operates in a second operation mode. The determination unit determines a type or an output capacity of the power supply apparatus, based on the detected first output voltage and the detected second output voltage.

Abstract: A power generation abnormality detection method includes operating a power converter to controllably operate a solar cell module at a plurality of predetermined voltage points to obtain a plurality of measured currents, utilizing the predetermined voltage points and measured currents to calculate a plurality of first power data, comparing the plurality of first power data with a first PV curve, or operating the power converter to controllably operate the solar cell module at a plurality of predetermined current points to obtain a plurality of measured voltages, utilizing the predetermined current points and measured voltages to calculate a plurality of second power data, and comparing the plurality of second power data with a second PV curve.

Abstract: A power switching circuit receives a first power, a second power and a switching signal, and generates an output power. The power switching circuit includes a first power path and a second power path. The first power path is connected with the first power. The second power path is connected with the second power. When the switching signal in a logic high level, the first power path is in a conducting state and the second power path is in a non-conducting state. Consequently, the first power is selected as the output power by the power switching circuit. When the switching signal in a logic low level, the first power path is in the non-conducting state and the second power path is in the conducting state. Consequently, the second power is selected as the output power by the power switching circuit.

Abstract: Electrical power is dynamically managed a power source a load. A control switching system has a plurality of monitor nodes, a control switch having two switching states, and an electrical power storage cell connected to the power source in one of the switching states for storing voltage, and operative for discharging the stored voltage to the electrical load in the other of the switching states. A programmed controller dynamically monitors operating conditions at the monitor nodes during operation of the electrical load and the power source, and switches the control switch between the switching states in response to the monitored operating conditions for supplying a voltage of a desired waveform shape to the load.

Abstract: Embodiments of the present invention include control methods employed in multiphase distributed energy storage systems that are located behind utility meters typically located at, but not limited to, medium and large commercial and industrial locations. These distributed energy storage systems can operate semi-autonomously, and can be configured to develop energy control solutions for an electric load location based on various data inputs and communicate these energy control solutions to the distributed energy storage systems. In some embodiments, one or more distributed energy storage systems may be used to absorb and/or deliver power to the electric grid in an effort to provide assistance to or correct for power transmission and distribution problems found on the electric grid outside of an electric load location. In some cases, two or more distributed energy storage systems are used to form a controlled and coordinated response to the problems seen on the electric grid.

Abstract: Embodiments of the present invention relate to a solution for supplying power to a processor. In some embodiments, there is provided a method for supplying power to a processor. The method comprises, in response to determining that an output voltage of a main power supply supplying power to a processor is lower than a predefined threshold, enabling an additional power supply to supply power to the processor. The method further comprises determining output power of the additional power supply. In addition, the method further comprises, in response to determining that the output power of the additional power supply exceeds peak power limit of the additional power supply, sending, by the additional power supply, a signal to the processor to lower a clock frequency of the processor.

Abstract: A power delivery control module includes a first interface, a second interface and a controller. The first interface is configured to be coupled with a first external device. The second interface is configured to be coupled with a second external device. The second interface is a USB Type-C interface, and the first interface is not a USB Type-C interface. The controller is coupled with the first interface and the second interface. Wherein when the first interface is coupled with the first external device and the second interface is coupled with the second external device, the power delivery control module selectively transfers power from the first external device to the second external device or from the second external device to the first external device.

Abstract: Apparatus and methods for radio frequency front-ends are provided. In certain configurations, a radio frequency front-end includes ultrahigh band (UHB) transmit and receive modules employed for both transmission and reception of UHB signals via at least two primary antennas and at least two diversity antennas, thereby supporting both 4×4 receive MIMO and 4×4 transmit MIMO with respect to one or more UHB frequency bands, such as Band 42, Band 43, and/or Band 48. The radio frequency front-end can operate with carrier aggregation using one or more UHB carrier frequencies to provide flexibility in widening bandwidth for uplink and/or downlink communications.

Abstract: A multi-mode circuit has a first switch, a second switch, a third switch and a fourth switch. A current sampling circuit applied to the buck-boost has a first sampling circuit, a second sampling circuit and a current processing circuit. The first sampling circuit generates a first sampling current by sampling the current flowing through the first switch, the second sampling circuit generates a second sampling current by sampling the current flowing through the second switch, and the current processing circuit generates a third sampling current based on the first sampling current and the second sampling current. An average value of the third sampling current of one cycle represents the output current of the multi-mode circuit.

Abstract: An embodiment of the present application provides a voltage conversion device configured to convert an inputted alternating voltage into a direct voltage or current, the voltage conversion device including at least a first voltage connector and a second voltage connector, where the alternating voltage is fed to the voltage conversion device via either the first voltage connector or the second voltage connector, the voltage conversion device further including: an electromagnetic filter unit; a conversion unit; a determination unit configured to determine which one of the first voltage connector and the second voltage connector is used to feed the alternating voltage into the voltage conversion device; a control unit controlling the conversion unit based on a determination result of the determination unit such that the direct voltage or current outputted by the conversion unit corresponds to the determination result, wherein the determination unit is electrically connected the first voltage connector and the se

Abstract: Unique systems, methods, techniques and apparatuses of a power grid control system. One exemplary embodiment is a nested microgrid system comprising a first microgrid including a network controller, a second microgrid, a third microgrid, a first restoration path selectively coupled between the second portion of the first microgrid and the second microgrid, and a second restoration path selectively coupled between the second portion of the first microgrid and the third microgrid. The network controller is configured isolate the first portion of the first microgrid from the second portion of the first microgrid, calculate weighting factors for the first and second restoration paths, select the first restoration path using the first weighting factor and the second weighting factor, and couple the second portion of the first microgrid to the second microgrid using the first restoration path.

Abstract: A Software Defined Networking (SDN) controlled Power over Ethernet (PoE) management system includes a plurality of Power Sourcing Equipment (PSE) networking devices that are each configured to provide both power and data over a network connection to a powered device. An SDN controller device that is coupled to each of the plurality of PSE networking devices. The SDN controller device detects each of the plurality of PSE networking devices. The SDN controller may then receive, from each of the plurality of PSE networking devices, a first SDN communication that includes Power over Ethernet (PoE) information for that PSE networking device. The SDN controller device may then generate a management graphical user interface that is configured to display any of the PoE information that was received in the first SDN communications from each of the plurality of PSE networking devices.

Abstract: A photovoltaic system with an inverter, at least one solar panel for providing electrical power, and electrical wiring for coupling electrical power from the at least one solar panel to the inverter. Also included is a transmitter for transmitting a messaging protocol along the electrical wiring, where the protocol includes a multibit wireline signal. Also included is circuitry for selectively connecting the electrical power from the at least one solar panel along the electrical wiring to the inverter in response to the messaging protocol.

Abstract: A controller for increasing efficiency of a power converter includes a comparison module and a gate signal generation unit. The comparison module is used for generating a detection voltage according to a direct current (DC) input voltage of a primary side of the power converter, and comparing the detection voltage with a predetermined value to generate a comparison result. The gate signal generation unit is used for changing a sink current flowing through a gate pin of the controller according to the comparison result, wherein the gate pin of the controller is coupled to a power switch of the primary side of the power converter.

Abstract: A relay module includes: power supply lines; main relay; sub relay with different current capacities. The first power supply line is connected to a main battery, the second power supply line is connected to a sub battery, and the third power supply line is connected to a load. The main relay is between the first and third power supply lines. The sub relay is between the second and third power supply lines. The main relay disconnects when a ground fault occurs in the first power supply line, and connects when a ground fault occurs in the second power supply line. The sub relay disconnects with a ground fault in the second power supply line, and connects with a ground fault in the first power supply line. Whichever one of the main relay and the sub relay has a larger current capacity becomes electrically connected, and the other becomes electrically disconnected.

Abstract: Provided is a power distribution system for improving reliability of power supply to the load in a case where a bidirectional DC/DC converter is connected to one power supply when making a power supply redundant, connecting a first battery and a second battery so as to supply power to a load, including: a bidirectional DC/DC converter detecting an output of the first battery and an output of the second battery, and controlling charge and discharge operation of the second battery: and a control unit detecting the output voltage of the first battery and the output voltage of the second battery, and determining from which one of the first battery and the second battery power should be supplied to the load based on detection results by the control unit and the bidirectional DC/DC converter.

Abstract: A power-down signal generating circuit receives first and second supply voltages, where the first supply voltage is less than the second supply voltage, and generates a power-down signal. The power-down signal generating circuit includes a driving amplifier, first through third transistors, and an amplification circuit. When the first supply voltage is deactivated, the power-down signal is activated. The driving amplifier prevents the first through third transistors from being enabled simultaneously, which reduces static leakage current.

Abstract: A portable transfer switch assembly for selecting power from a plurality of sources to supply to a load. The assembly contains a controller comprising logic that is defined by a user. The user defined switch controller allows an optimal power source to supply power to selected loads based on user input, sensors and pre-defined data. The assembly further provides load shedding of loads connected via one or more receptacles based on user input, sensors and pre-defined data.

Abstract: Embodiments disclosed herein describe a solar panel protection and control system. The system can bypass the solar panel under hazardous conditions or under command. The system can also help a solar panel array to reach its maximum power point in operation.

Abstract: Methods, systems, and computer readable media are disclosed for maintaining photovoltaic power plant reactive power capability, e.g., through the manipulation of direct current (DC) voltage. In some examples, A control system includes a monitor input for receiving a monitor signal indicative of an input voltage of an inverter system and a control output for outputting a control signal to a voltage-clipping device of a solar panel system supplying a solar output voltage to the inverter system. The control system includes a control circuit configured to perform operations comprising: determining, using the monitor signal, that the input voltage of the inverter system exceeds a threshold voltage; and in response to determining that the input voltage of the inverter system exceeds the threshold voltage, causing, using the control signal, the voltage-clipping device to reduce the solar output voltage by shorting out one or more photovoltaic solar cells of the solar panel system.

Abstract: Embodiments of the present invention include control methods employed in multiphase distributed energy storage systems that are located behind utility meters typically located at, but not limited to, medium and large commercial and industrial locations. These distributed energy storage systems can operate semi-autonomously, and can be configured to develop energy control solutions for an electric load location based on various data inputs and communicate these energy control solutions to the distributed energy storage systems. In some embodiments, one or more distributed energy storage systems may be used to absorb and/or deliver power to the electric grid in an effort to provide assistance to or correct for power transmission and distribution problems found on the electric grid outside of an electric load location. In some cases, two or more distributed energy storage systems are used to form a controlled and coordinated response to the problems seen on the electric grid.

Abstract: An electrical power distributor for an electricity grid comprising an electrical distributor circuit having at least three terminals, wherein sources and sinks for electrical energy can be connected to the terminals, and wherein the three terminals are electrically connected together in such a way that an electric current can flow from each of the terminals to each of the other terminals. Each of the terminals has a respective power controller which is so adapted that in operation of the power distributor the electric power P(t) flowing by way of the respective terminal can be adjusted in dependence on time t. The control means is connected to each of the power controllers, and it calculates the electric power P(t) flowing by way of each of the terminals in dependence on the data received from the sources or sinks.

Abstract: A control system or controller (190) for a vehicle (100), the vehicle (100) comprising: at least one energy-consuming subsystem (180), such as a battery cooling system (180), for controlling a or a respective first vehicle operating parameter, e.g. the battery operating temperature, and actuation means for the subsystem (180) for activating or deactivating it in accordance with vehicle operational requirements; wherein the control system (190) is configured to: determine a value of a or a respective second vehicle operating parameter which is dependent on a location of the vehicle (100), such as a distance (x, y) between a current location of the vehicle and a reference location, e.g. a driver's home or workplace, and control the actuation means of the subsystem (180) so as to deactivate the subsystem (180), optionally for a prescribed period of time, in dependence on the value of the determined vehicle location-dependent second vehicle operating parameter.

Abstract: An input circuit for providing a supply voltage, which input circuit has a first input on the input side, wherein the input circuit has at the output end an output which serves to connect an electronic unit. The supply voltage can be transmitted via the first input to the output of the input circuit, and the first input of the input circuit is connected via a first path to the output of the input circuit. In the first path a switching unit is provided which serves for connecting the first input to an auxiliary connection of the input circuit.

Abstract: A power storage power conditioner includes an input part, a voltage-transforming part, a first input-output part, a converting part and a second input-output part. The voltage-transforming part transforms the voltage of DC power from the input part and the converting part into a second predetermined voltage. The first input-output part outputs the DC power of the voltage-transforming part to a battery unit, and inputs DC power from the battery unit. The voltage-transforming part transforms a voltage of the DC power from the first input-output part into a third predetermined voltage. The converting part converts the DC power from the input part and the voltage-transforming part into AC power. The second input-output part outputs the AC power to a power system or a load, and inputs AC power from the power system. The converting part converts the AC power from the second input-output part into DC power.

Abstract: An integrated circuit is disclosed for power multiplexing with an active load. In an example aspect, the integrated circuit includes a first power rail, a second power rail, a load power rail, multiple power-multiplexer tiles, and power-multiplexer control circuitry. The first power rail is at a first voltage, and the second power rail is at a second voltage. The multiple power-multiplexer tiles are coupled in series in a chained arrangement and jointly perform a power-multiplexing operation responsive to a power-rail switching signal. Each power-multiplexer tile switches between coupling the load power rail to the first power rail and the second power rail. The power-multiplexer control circuitry is coupled to the first and second power rails and includes a comparator to produce a relative voltage signal based on the first and second voltages. The power-multiplexer control circuitry generates the power-rail switching signal based on the relative voltage signal.

Abstract: Concepts and technologies are disclosed herein for flexible batteries and methods for forming flexible batteries. A flexible battery can include a borophene sheet, a pyroelectric peptide microtubule, and a borophene cap. A first end of the pyroelectric peptide microtubule can be located adjacent to the borophene sheet and the borophene cap can be located at a second end of the pyroelectric peptide microtubule. The borophene cap can collect a charge created by the pyroelectric peptide microtubule. The flexible battery also can include a collection wire that directs the charge to a borophene capacitor charge system.

Abstract: A photovoltaic system includes: a photovoltaic generator comprising strings that each includes one or more photovoltaic cells; a power converter; switches; and a controller. The power converter is configured to convert direct current (DC) power provided by the photovoltaic generator into alternating current (AC) power, and to output the AC power. Each switch is associated with one of the strings and is configured to connect the associated string to the power converter when set to a first setting, such that power generated by the first string can flow to the power converter. Each switch is also configured to disconnect the string from the power converter when set to a second setting. The controller is configured to control the power provided by the photovoltaic generator by selectively connecting the strings of the photovoltaic generator to the power converter by controlling the settings of the switches.

Abstract: The present invention relates to an energy storage module system and, more specifically, to a hybrid energy storage module system selectively using, according to the amount of power required in a load, a lithium battery and a lead storage battery by mutually supplementing the lithium battery and the lead storage battery. According to the present invention, the hybrid energy storage module system is an energy storage module system for supplying power necessary for the driving of a load and comprises an energy storage device, a first sensing unit and a second sensing unit, and a controller. The energy storage device includes at least one lithium battery module and at least one lead storage battery module. In addition, the energy storage device includes a switching network configured so as to connect the lithium battery module and the lead storage battery module in different arrangement modes. The energy storage device is connected to both ends of a load and supplies power.

Abstract: A voltage selection circuit includes: a power detection circuit configured to compare an output voltage with a first input voltage and a second input voltage, respectively; a latch circuit, coupled to the power detection circuit, and configured to flip respective logic states of a pair of output signals when the output voltage is lower than either the first input voltage or the second input voltage; and a selection circuit, coupled to the latch circuit, and configured to use either the first input voltage or the second input voltage as the output voltage based on the respective logic states of the pair of output signals.

Abstract: A method for direct current power line communication in a photovoltaic system includes (a) transferring power between a photovoltaic device and a load using a power line, (b) detecting a change in operation of the power line, and (c) in response to the detected change in operation of the power line, decoding operating state of the power line to obtain information. A method for direct current power line communication in a photovoltaic system includes (a) transferring power between a photovoltaic device and a load using a power line, (b) changing operation of the power line, and (c) encoding operating state of the power line to represent information to be communicated.

Abstract: A method of controlling a voltage switch circuit can include: controlling an output voltage of the voltage switch circuit to be switched from a first voltage input to a first switch circuit to a second voltage input to a second switch circuit to be no larger than a smaller one of the first and second voltages before the second switch circuit starts conducting; switching the output voltage to the second voltage when the second switch circuit starts conducting, where outputs of the first and second switch circuits are coupled together to provide the output voltage; and controlling the first switch circuit to turn off after the second switch circuit conducts and when the output voltage is no larger than the smaller one of the first and second voltages.

Abstract: A battery system (10) has a battery (12) for providing a first voltage and has at least one tap (15, 19, 21) that divides the battery (12) into at least one first battery element (14) for providing a first partial voltage and at least one second battery element (16) for providing a second partial voltage. A power changeover switch (18) is arranged between the at least one first battery element (14) and the at least one second battery element (16) and is designed to change over between the at least one first battery element (14) and the at least one second battery element (16) at a changeover rate to be specified.

Abstract: The invention relates to a secure electrical supply system for powering an electrical load (3) comprising: a main electrical power supply source (1), an electrical power supply circuit (8) linking the main electrical power supply source (1) to the electrical load, at least one control unit (5) for opening or closing said electrical power supply circuit (8), a secondary electrical power supply source (2) connected to the electrical power supply circuit and designed to power the electrical load (3) in case of interruption of the electrical power supply provided by the main electrical power supply source (1), a control device (6) comprising an emitter device (60) designed to dispatch a message representative of a change of state of the control unit (5) and a receiver device (61) designed to receive said message and to control the turning on or the turning off of said secondary electrical power supply source (2) according to the new state taken by the control unit (5).

Abstract: A method of setting a reference DC-link voltage of a wind-turbine converter system is provided. At least at least one DC voltage demand from at least one generator-side inverter and at least one DC voltage demand are received from at least one grid-side inverter. A generator-side DC voltage demand value on the basis of the at least one DC voltage demand received from the at least one generator-side inverter. Also a grid-side DC voltage demand value is determined on the basis of the at least one DC voltage demand received from the at least one grid-side inverter. The highest DC voltage demand value out of the generator-side and grid-side DC voltage demand values is chosen. This chosen value corresponds to the set reference DC-link voltage.

Abstract: A high efficiency solar power system combining photovoltaic sources of power (1) can be converted by a base phase DC-DC photovoltaic converter (6) and an altered phase DC-DC photovoltaic converter (8) that have outputs combined through low energy storage combiner circuitry (9). The converters can be synchronously controlled through a synchronous phase control (11) that synchronously operates switches to provide a conversion combined photovoltaic DC output (10). Converters can be provided for individual source conversion or phased operational modes, the latter presenting a combined low photovoltaic energy storage DC-DC photovoltaic converter (15) at string or individual panel levels.

Abstract: An electrical or electronic device (7) capable of being supplied with two different values of voltage from respectively a first electrical network (3) and from a second electrical network (8), comprises: a first connecting interface (70) capable of being linked, under normal connection conditions, with a ground conductor (GND_12) and a voltage conductor of the first electrical network (3); a second connecting interface (71) capable of being linked, under normal connection conditions, with the ground conductor (GND_48) and a voltage conductor of the second electrical network (8); the ground connections of the two connecting interfaces (70, 71) being linked together to form a common ground; and at least one switch module (74; 75) interposed in series on the common ground, the switch module being capable of switching into an open position following a modification in the connection conditions of the first or second interface.

Abstract: An information processing apparatus includes a first power supply unit, a first device and a second device to which power is supplied from the first power supply unit, a second power supply unit, a third device to which power is supplied from each of the first power supply unit and the second power supply unit, and a power control unit configured to perform control to switch a power supply source for the third device from the first power supply unit to the second power supply unit, and then to cause power to be supplied from the first power supply unit to the second device.

Abstract: In accordance with presently disclosed embodiments, a multi-mode energy router (MMER) is provided. The MMER includes a functional block of power electronics under processor control. In addition, the MMER includes a plurality of switches that can be controlled to route power from specific sources or loads to the input or output of the functional block. The MMER enables a single functional block of power electronics to selectively provide bi-directional power conversion between AC and DC components and between DC and DC components.

Abstract: A power supply system includes a power conversion circuit, a conversion control circuit, an auxiliary power module, an electricity supply module and a power supply control circuit. The power conversion circuit converts an input power into an output power used as an output of the power supply system. The conversion control circuit is arranged for controlling an operation of the power conversion circuit according to a control power. The auxiliary power module is arranged for selectively outputting a first electrical power to the conversion control circuit. The electricity supply module is arranged for providing a second electrical power. The power supply control circuit is coupled to the auxiliary power module and the electricity supply module, and arranged for referring to at least the second electrical power to determine whether to provide the first electrical power or the second electrical power as the control power for the conversion control circuit.

Abstract: A method for uploading data of a cell panel monitoring system and a cell panel monitoring system are provided. The method includes: collecting parameter information of each string of photovoltaic cells in each of a plurality of cell panels of a photovoltaic system; modulating the parameter information into a pulse carrier signal; and loading the pulse carrier signal to a busbar of the photovoltaic system, where the busbar is connected in series with each of the cell panels; where parameter information of the cell panels is obtained by a server of the photovoltaic system through demodulation on receiving the pulse carrier signal, data uploaded in a preset time difference ?T is determined as valid data, remaining data is discarded, and the server is connected in series in the busbar. A cell panel monitoring system is further provided.

Abstract: Systems and methods for controlling a tap location associated with a string of an energy storage system are provided. In one embodiment, an energy storage system can include one or more strings. Each of the one or more strings can include a plurality of energy storage cells coupled in series. Each of the one or more strings can be associated with a selectively adjustable tap location to control the number of cells in the string that provide power to a power system. The energy storage system can further include a one or more control devices that can be configured to detect a change in a voltage associated with one or more of the one or more strings. The one or more control devices can be configured to adjust the tap location for at least one of the one or more strings in response to the change in the voltage.

Abstract: An apparatus and method for managing a battery are disclosed. The apparatus may include a state verifier configured to verify respective states of charge (SoCs) of batteries to be balanced by the apparatus, and a controller configured to control power converters configured to convert respective amounts of power of the batteries to allow a greater amount of power to be output from a battery having a greater SoC among the batteries.

Abstract: An electric power tool includes a motor, a power supply circuit for supplying power to the motor, and a control device which is able to measure current of the motor and control duty cycle of the power supply circuit. When the measured current of the motor is greater than a predetermined current value, the duty cycle of the power supply circuit is increased to a first predetermined value. If the current of the motor is still greater than the predetermined current value, the duty cycle of the power supply circuit is decreased to a second predetermined value such that the current of the motor is equal to or less than the predetermined current value.

Abstract: The present system 1 includes a distributed power source 2, a storage battery 4, a bidirectional inverter 7 having a smoothing capacitor 6 on its DC side, and a control section 10 for controlling the entire system, and supplies AC power to a load 9 while being interconnected with a power system 8. When active power supplied from the distributed power source 2 and/or the storage battery 4 to the smoothing capacitor 6 is equal to or greater than active power of load power, the control section 10 controls a power factor of inverter output current outputted from the bidirectional inverter 7 so as to coincide with a power factor of load current flowing to the load 9.

Abstract: Systems and method for utilizing energy harvesting techniques to power a battery-less wireless medical sensor to perform intermittent operations are disclosed. The systems may include one or more sensing components configured to generate data related to one or more physiological parameters by performing intermittent measurements on a patient. The systems and method may include wireless communication circuitry configured to wirelessly transmit the data to a monitor. The monitor may be configured to operate with the battery-less wireless medical sensor or may download required operational algorithms if needed. The intermittent measurement and transmission may be asynchronously executed. The systems and method may include a processing device configured to determine when to perform the intermittent measurement and transmit data based at least upon a power source energy level, a rate at which to perform the intermittent measurement and transmit data, a prioritization, or a triggering event.