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1526 results about "Load circuit" patented technology

Load Circuit. Any electrical device for usefully converting or consuming electrical energy other than those devices which are merely accessory, auxiliary, or appurtenant to the source and/or the circuit which supplies electric energy.

Battery charger for lithium based batteries

A method for charging a battery, such as a lithium based battery, which applies different charge pulses and discharge pulses to the battery, takes voltage measurements during those charge pulses, discharge pulses, and rest periods between the charge pulses and discharge pulses, and determines whether to terminate or to continue charging the battery. The full sequence of charge pulses, discharge pulses, and rest periods, includes a plurality of charge pulses (1), separated by rest periods (2) and followed by a rest period (3). This is then followed by a plurality of discharge pulses (4), separated by rest periods (5) and followed by a rest period (6). This is then followed by a plurality of extended charge pulses (7), separated by rest periods (8) and followed by a rest period (9). Then another discharge pulse (10) is applied, followed by a rest period (11). This is followed by a plurality of alternating charge pulses (13) and discharge pulses (12), separated by rest periods (13, 15) and followed by a rest period (16). Then another plurality of discharge pulses (17) is applied, separated by rest periods (18) and followed by a rest period (19). Open circuit voltage measurements taken during the rest periods, loaded circuit voltage measurements taken during the discharge pulses, and charge pulse voltage measurements taken during the charge pulses, are used to determine whether to continue or to terminate the charging of the battery.
Owner:ENREV

Implantable pulse generators using rechargeable zero-volt technology lithium-ion batteries

InactiveUS7177691B2System operation is safe and reliableFirmly connectedElectrotherapyLoad circuitSpinal cord stimulation
An implantable medical device, such as an implantable pulse generator (IPG) used with a spinal cord stimulation (SCS) system, includes a rechargeable lithiumion battery having an anode electrode with a substrate made substantially from titanium. Such battery construction allows the rechargeable battery to be discharged down to zero volts without damage to the battery. The implantable medical device includes battery charging and protection circuitry that controls the charging of the battery so as to assure its reliable and safe operation. A multi-rate charge algorithm is employed that minimizes charging time while ensuring the battery cell is safely charged. Fast charging occurs at safer lower battery voltages (e.g., battery voltage above about 2.5 V), and slower charging occurs when the battery nears full charge higher battery voltages (e.g., above about 4.0 V). When potentially less-than-safe very low voltages are encountered (e.g., less than 2.5 V), then very slow (trickle) charging occurs to bring the battery voltage back up to the safer voltage levels where more rapid charging can safely occur. The battery charging and protection circuitry also continuously monitors the battery voltage and current. If the battery operates outside of a predetermined range of voltage or current, the battery protection circuitry disconnects the battery from the particular fault, i.e. charging circuitry or load circuits.
Owner:QUALLION +1

Electric field coupling-based wireless power transmission system

The invention discloses an electric field coupling-based wireless power transmission system. The system comprises a power supply circuit, a high-frequency inverter circuit, a tuning circuit, an electric field coupling polar plate, a rectifier filter circuit and a load circuit and is characterized by also comprising a coupling capacitance detection module, a controller and a fixed frequency drive circuit; a capacitance compensation array is arranged in the tuning circuit; the controller detects parameters of the electric field coupling polar plate and controls compensation values of the capacitance compensation array through the coupling capacitance detection module, and outputs fixed frequency control signals; and the fixed frequency signals are transmitted to the fixed frequency drive circuit, and then the high-frequency inverter circuit is driven to work. The electric field coupling-based wireless power transmission system has the advantages that based on the electric field coupling, the transmission capacity and efficiency of the system are improved by adopting an E amplifier; and by arranging the coupling capacitance detection module, the electric field coupling polar plate of the system is detected in real time, and the capacitance compensation value can be effectively controlled, so that the system is kept in the soft switching state, and the power transmission stability and reliability of the system are improved.
Owner:重庆华创智能科技研究院有限公司

Method And System For Optimizing Filter Compensation Coefficients For A Digital Power Control System

A method and system is provided for optimizing the digital filter compensation coefficients of a digitally controlled switched mode power supply within a distributed power system. A power control system comprises at least one point-of-load (POL) regulator having a power conversion circuit adapted to convey power to a load and a digital controller coupled to the power conversion circuit though a feedback loop. The digital controller is adapted to provide a pulse width modulated control signal to the power switch responsive to a feedback measurement of an output of the power conversion circuit. The digital controller further comprises a digital filter having a transfer function defined by plural filter coefficients. The digital controller periodically stores a successive one of a plurality of samples of the feedback measurement. A serial data bus operatively connects the POL regulator to a system controller. The system controller retrieves each successive stored sample from the digital controller via the serial data bus. After retrieving a pre-determined number of the samples, the system controller calculates optimized filter coefficients for the digital filter and communicates the optimized filter coefficients to the digital controller. The digital controller thereafter uses the optimized filter coefficients in the digital filter.
Owner:BEL POWER SOLUTIONS INC

Automobile power supply system and control method thereof

The invention relates to an automotive power supply system and a control method thereof. The automotive power supply system comprises a vehicular power battery (1), a start-up battery (3) and a plurality of loads which respectively form a start-up circuit, a load feed circuit and a charging circuit, wherein, the start-up circuit is used for connecting a power supply loop between the vehicular power battery (1) and the loads only when the start-up circuit is connected; the automotive power supply system also comprises a charge control device (12); the charge control device (12) is used for respectively monitoring the voltages of the vehicular power battery (1) and the start-up battery (3) in a real-time manner and cutting off or connecting the charging circuit according to the monitoring result. The technical proposal adopted in the automotive power supply system and the control method thereof can charge the start-up battery at any time, so the start-up battery does not need to reserve a large mount of electrical energy, and the start-up battery which is used in the automotive power supply system and the control method thereof can adopt the battery that has smaller capacity and provides instant high current discharge, such as a nickel-cadmium battery; for the combination whole-body of the charge control device (12), the volume is small, the weight is light, the space in a vehicle chamber is saved greatly, the automotive load is lightened, and the cost is also lowered.
Owner:青岛市比亚迪汽车有限公司

Starting and shutdown control method for proton exchange membrane fuel cell

The invention provides a starting and shutdown control method for a proton exchange membrane fuel cell. According to the method, a whole fuel cell stack is divided into a plurality of cell modules; each cell module is connected with a modularized discharging circuit which is composed of a control switch, an auxiliary load and a crystal diode in mutual series connection; each modularized discharging circuit and a main load circuit are in series connection and are respectively connected with the cathode end and the anode end of the fuel cell; an air source is connected with the anode end of the fuel cell through an air blow-down valve; and air is used to purge residual hydrogen at the anode. During starting control, hydrogen is used to purge the anode, and the auxiliary load is used to control the voltage of the cell; and during shutdown control, introduction of air and introduction of hydrogen are successively stopped, a closed system of the auxiliary load is used for discharging, and introduction of air is cooperatively used for purging of the anode. The invention has the following advantages: consumption of time during shutdown of the fuel cell is reduced; the concentration of residual oxygen at the cathode is lowered down; reversal of poles of a single cell in the modules is prevented, and the phenomenon of reversal of poles of the fuel cell in the processes of shutdown discharging and air purging is prevented; and the system of the fuel cell is more simplified and is convenient to operate.
Owner:WUHAN UNIV OF TECH

Quasi-zero power consumption standby control circuit device and control method

The invention discloses a quasi-zero power consumption standby control circuit device. The quasi-zero power consumption standby control circuit device is arranged between a power supply and an electrical device and comprises a main power supply, an auxiliary power supply and a main control chip. An input end of the main power supply is directly connected with the power supply, and an output end of the main power supply is connected to the main control chip and used for supplying power to the main control chip; an input end of the auxiliary power supply is connected to the power supply through a control switch, and an output end of the auxiliary power supply is connected with a load in the electrical device; a first control end of the main control chip is connected with the control switch and used for controlling the control switch to be turned on and off. The invention further relates to a control method applied to the control circuit device. Through the mode of independent power supply to a high-power load circuit, a small-specification power supply can serve as the main power supply, extremely high efficiency can be kept during a light load, the main power supply is extremely small in load during standby time, and accordingly ultra-low power consumption during the standby time is achieved.
Owner:GREE ELECTRIC APPLIANCES INC
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