Abstract: A system for providing power includes a control and a switch. The control is configured to indicate providing parallel power to a vehicle mounted device. The switch is configured to connect power in parallel to the vehicle mounted device, where connecting power in parallel includes back current protection.

Abstract: Provided in the present invention is a direct current power grid voltage control method, dividing control of a direct current power grid voltage into three processes, namely natural voltage regulation, first voltage regulation and second voltage regulation; the converter stations in the direct current power grid are divided into three types, namely power regulation converter stations, auxiliary voltage regulation converter stations, and voltage regulation converter stations, on the basis of whether the converter station has a voltage regulation capacity, the power regulation converter stations operating in a fixed power control mode, the voltage regulation converter stations operating in a fixed voltage control mode or an auxiliary voltage control mode, and the auxiliary voltage control converter stations operating in the auxiliary voltage control mode; all the converter stations in the direct current power grid participate in natural voltage regulation, the auxiliary voltage regulation converter stations and

Abstract: A control system and methods for a multilevel power converter are provided. The converter includes a rectifier coupled to a DC link having a midpoint coupled to electrical ground that divides the DC link into two halves. The control system is configured to generate a reference current command for controlling an output of the rectifier, the reference current command generated based on a difference between a desired and measured DC link voltage value. The system is also configured to determine a zero-sequence current component of input current supplied to the multilevel power converter, wherein the zero-sequence current component is associated with non-linearities in said multilevel power converter that cause ground current injection into the input current by the rectifier. The system is further configured to subtract the determined zero-sequence current component from the reference current command to reduce the ground current injected into the input current by the rectifier.

Abstract: An alternating-current voltage detection circuit for detecting an alternating-current voltage from an alternating-current power source according to one or more embodiments may include: a rectification circuit that performs full-wave rectification on an alternating-current voltage from the alternating-current power source and supplies a rectified output to a load; a series circuit comprising a first capacitor and a second capacitor electrically connected in series between one end of the alternating-current power source and the ground terminal of the rectification element; a discharge circuit that causes the second capacitor to discharge such that an absolute value of dv/dt voltage does not reach a predetermined voltage, wherein the second capacitor is electrically connected to the ground terminal side of the rectification element; and a predetermined period generator that outputs a signal after an elapse of a predetermined period of time from stoppage of a discharge operation of the discharge circuit.

Abstract: A receiver of a wireless power transmission system may include a capacitor-and-inductor configured to receive power from a transmitter using a resonance, at least one capacitor configured to connect to an output node of the receiver, and a plurality of switches configured to control current flow within the receiver. The plurality of switches may be controlled so that the capacitor-and-inductor may be disconnected from the at least one capacitor and the output node at preset periods. Current resonating in the capacitor-and-inductor may increase during disconnection between the at least one capacitor and the output node. The plurality of switches may output the increased current to the battery by connecting the capacitor-and-inductor to the capacitor and the output node after the period, connect at least one capacitor and the output node in series after the period, and operate to reduce root mean square (RMS) current within the receiver.

Abstract: A method for operating a household appliance with an accumulator, wherein a charging start time of a charging operation for charging the accumulator is controlled in dependence on predefined conditions. In order to ensure a required charge capacity of the accumulator without a charge maintaining mode, it is proposed that the charging start time is controlled in dependence on a charging period and a predefined time of use of the household appliance.

Abstract: A wireless power transmitter which is capable of charging a plurality of wireless power receivers is discussed. The wireless power transmitter includes a plurality of coil cells, a main half-bridge inverter to which a main pulse signal is applied, a plurality of sub half-bridge inverters to which a first sub pulse signal or a second sub pulse signal is applied, at least one current sensor configured to monitor a current, and a communications and control unit configured to control the pulse signals applied to the main half-bridge inverter and sub half-bridge inverters and communicate with the wireless power receivers.

Abstract: A method of measuring a Q-factor in a wireless power transmitter includes charging a capacitor in a LC tank circuit that includes a transmission coil to a voltage; starting a Q-factor determining by coupling the LC tank circuit to ground to form a free-oscillating circuit; monitoring the voltage across the capacitor as a function of time as the LC tank circuit oscillates; and determining the resonant frequency and the Q-factor from monitoring the voltage.

Abstract: A control module is arranged in alignment with a battery module in a longitudinal direction. The control module includes a busbar, a switch and a current sensor configured to detect electric current flowing through the busbar. The current sensor includes a magneto-electric transducer and a magnetic field suppressor. The magneto-electric transducer is configured to convert a magnetic field, which depends on the electric current flowing through the busbar and passes through the magneto-electric transducer along a plane perpendicular to a height direction, into an electrical signal. The magnetic field suppressor is configured to suppress external magnetic fields from passing through the magneto-electric transducer along the plane perpendicular to the height direction. The switch includes a pair of magnets that are magnetized and opposed to each other in a lateral direction perpendicular to both the longitudinal and height directions. The current sensor is aligned with the magnets in the longitudinal direction.

Abstract: Disclosed are a magnetic field generating apparatus and a method of generating a magnetic field using the same. A magnetic field generating apparatus according to an embodiment of the present disclosure includes a coil part configured to generate a magnetic field transmitted to the target to which wireless power is to be supplied; a first ferrite member configured to extend in the vicinity of the coil part a bar shape and penetrate an inner peripheral surface of the coil part; and a second ferrite member configured to extend in a dome shape in the vicinity of the coil part, surround the coil part, include an opening formed along the magnetic field transmission path.

Abstract: The present application provides a method of controlling an electrical power system and an apparatus using the same. The electrical power system includes a DC bus and a DC bus capacitor connected to the DC bus. The method includes: receiving a virtual DC bus capacitance value of the DC bus capacitor; detecting a DC bus voltage; calculating an expected value of a DC bus current based on the virtual DC bus capacitance value and the DC bus voltage; and adjusting the DC bus current, so that the DC bus current reaches the expected value and thus the DC bus capacitor is equivalent to the virtual DC bus capacitance value.

Abstract: A control device includes a plurality of input ports to which electrical components are connected, a potential setting unit that sets the plurality of input ports to have any one of a first reference potential and a second reference potential different from the first reference potential, an ID specifying unit that specifies identification information of the control device based on a combination of electric potentials of the plurality of input ports, a storage unit that stores the specified identification information, and a control unit that controls the electrical component based on the specified identification information. In the control device, in a given case, the ID specifying unit prohibits the identification information specified at the start of the control device from being written into the storage unit for a prescribed time, and specifies the identification information again after the prescribed time and writes it into the storage unit.

Abstract: The invention is to a controller for a DC electric motor having a first drive circuit and a second drive circuit that operate in a first state and a second state wherein, in the first state, circuits are connected with terminals input and are responsive to the control signals for receiving a load current and selectively energising winding to create torque in motor. In the second state, circuit is disconnected from terminal such that: circuit is able to be responsive to current for generating a first DC charging current to batteries; and circuit is able to connect with a terminal and be responsive to a second DC charging current for selectively directing an energizing current through winding.

Abstract: A detection method for use in a primary unit of an inductive power transfer system, the primary unit being operable to transmit power wirelessly by electromagnetic induction to at least one secondary unit of the system located in proximity to the primary unit and/or to a foreign object located in said proximity, the method comprising: driving the primary unit so that in a driven state the magnitude of an electrical drive signal supplied to one or more primary coils of the primary unit changes from a first value to a second value; assessing the effect of such driving on an electrical characteristic of the primary unit; and detecting in dependence upon the assessed effect the presence of a said secondary unit and/or a foreign object located in proximity to said primary unit.

Abstract: Systems and methods are provided for enabling ambient radio frequency (RF) energy to be harvested with a device. In an embodiment, wideband phased array antennas in the device efficiently harvest ambient RF energy over a broad electromagnetic spectrum, and circuitry adapts this RF energy into DC power for battery charging or energy storage. In an embodiment, the device is a modularly connected/disconnected, passive, wireless RF-to-DC adapter accessory that can ultimately be used to supply power to an electric apparatus and/or transporter.

Abstract: An electronic lock structure using a wireless charging device contains a power supply unit and an electronic lock unit. The power supply unit includes a variable-frequency drive and an AC/DC transformer. The electronic lock unit includes a battery and a rectification circuit, wherein the rectification circuit electrically outputs power of alternative current by way of a power receiving coil. When the power receiving coil is close to the power output coil, the power supply outputs the power to the electronic lock unit by using magnetic flux and to supply the power to the battery, thus charging the battery. When the power receiving coil is away from the power output coil, the power output coil does not conduct the power to the power receiving coil.

Abstract: The present invention discloses a power-on/off drive circuit and a method for controlling the power-on/off drive circuit, and belongs to the field of electronic technologies. The power-on/off drive circuit includes a load, a switch circuit, a relay, and a single-source drive circuit; one end of a coil in the relay and a first input end of the single-source drive circuit are separately connected to a positive electrode of a second external power supply, and the other end of the coil in the relay is connected to a second input end of the single-source drive circuit; and a first output end of the single-source drive circuit is connected to a second input end of the switch circuit, a second output end of the single-source drive circuit is connected to the output end of the switch circuit, and a third output end of the single-source drive circuit is connected to a negative electrode of the second external power supply. In the present invention, a volume of a power-on/off drive circuit is reduced.

Abstract: A wireless power transmitter circuit includes a power converter circuit, a power inverter circuit, an LC circuit, a resonant transmitter circuit, and a control circuit. The LC circuit includes an inductor and a capacitor, wherein an reactance of the LC circuit is substantially zero. The LC circuit is for converting the AC output current to a coil current. The resonant transmitter circuit includes at least one transmitter coil and a variable capacitor circuit, wherein the coil current flows through the at least one transmitter coil to generate a resonant wireless power. The control circuit generates a capacitance adjustment signal for adjusting an impedance of the variable capacitor circuit, such that the resonant transmitter circuit substantially operates in an impedance matched condition.

Abstract: Method and apparatus for generating power. In one embodiment the method comprises determining a value of a DC parameter pertaining to a DC power source providing DC power to an inverter; comparing the value to a threshold; and operating the inverter to generate positive power or negative power based on a result of comparing the value to the threshold.

Abstract: A power supply is electrically connected between a pair of input terminals and is configured to be supplied with electric power from an AC power supply to generate control electric power. A voltage detector is configured to detect a voltage of the control electric power. A controller is configured to be supplied with the control electric power from the power supply to operate. The controller is configured to control a bidirectional switch based on a detection signal from a phase detector so as to switch the bidirectional switch from an ON state to an OFF state at a switching time point when a variable time corresponding to a dimming level elapses from a starting point of a half period of an AC voltage. A stopper is configured to halt generation of the control electric power by the power supply when the voltage detected by the voltage detector is higher than or equal to a prescribed threshold during an OFF time period from the switching time point to an end time point of the half period.