A charger includes: a rectifier including input terminals, a cathode terminal and an anode terminal, wherein the input terminals are configured for connection to an AC power supply; a DC/DC converter including a first terminal, a second terminal and output terminals, the first terminal being configured to be connected to the cathode terminal of the rectifier, the second terminal being configured to be connected to the anode terminal of the rectifier, wherein the output terminals are configured for connection to a battery; and a power pulsation absorbing circuit including a first to third diodes, an inductor, a capacitor, a first switch and a second switch, wherein the DC/DC converter, the first and second switch are controlled to obtain a constant sum of a power outputted from the AC power supply and a power outputted from the capacitor during increasing a voltage outputted from the AC power supply.

A charger is configured such that in case where control of switching of a DC/DC converter includes a first mode and a second mode, a dead time is provided between the first mode and the second mode when switching from the first mode to the second mode and a first switch of a power pulsation absorbing circuit is controlled to be in an off-state during a time until expiration of a predetermined time after start of the dead time, wherein in the first mode, at least one switch of switches of the DC/DC converter is switched on, at least one switch of the switches of the DC/DC converter is switched off, and the first switch of the power pulsation absorbing circuit is switched off, and wherein in the second mode, the switch of the DC/DC converter which is switched off in the first mode is switched on, and the first switch of the power pulsation absorbing circuit is switched on.

A battery pack is provided in which the battery pack itself can recognize a determination of a full charge, which is made by a charger, without using a communication line. A battery pack is provided with a secondary battery, current measurement means for measuring a charging current for charging the secondary battery, and a control circuit which receives an output signal from the current measurement means. The control circuit determines that the secondary battery is fully charged when a reduction rate of the charging current in a unit time exceeds a predetermined value.

Methods, systems, and devices are disclosed for generating a battery charging signal. A method includes generating an initial waveform having a voltage curve and a current curve, wherein the initial waveform includes a leading edge portion characterized by a leading edge parameter, a body portion characterized by a body parameter, and a rest portion characterized by a rest parameter. By comparing leading edge phase shifts and body phase shifts to leading edge thresholds and body thresholds, an adjusted leading edge, body, and rest parameters may be determined and saved for use in generating subsequent waveforms. A method of charging a battery includes charging a battery using a constant current mode, probing the battery with a probing signal and receiving a response signal from the battery, determining a resonance frequency from the response signal, and constructing a charging waveform based on the resonance frequency.

An operation circuit and a chip pertaining to the field of integrated circuit design technology are disclosed by the present application. The circuit includes a capacitor charging/discharging module and an error amplification module electrically connected to the capacitor charging/discharging module. The capacitor charging/discharging module is configured to receive a first signal and a third signal that are external to the capacitor charging/discharging module and to output a feedback signal. The error amplification module is configured to receive the feedback signal and a second signal that is external to error amplification module and to output, based on the received feedback and second signals, a target signal to the capacitor charging/discharging module. In a steady state, values of the target, first, second and third signals satisfy a predefined mathematical relationship.

A physical container (e.g., a battery) may be filled up (charged) or emptied (discharged) with energy commensurate with requirements to post a particular amount of collateral. The disclosure provides computing systems and methods for processing data using a novel combination of wavelet techniques and rolling techniques to more efficiently detect seasonality in particular products (e.g., energy products) to more accurately model and determine collateral/margin requirements. A clearinghouse computing device may be configured to generate a margin requirement for a portfolio of products and may include a processor to process instructions that cause the clearinghouse computing device to perform wavelet decomposition and rolling methods on a historical database of records.

Systems and methods for using a battery voltage loop under high-current conditions are described. A method for operating a charger, the method includes setting, by a charger controller, a battery voltage threshold; setting, by the charger controller, an on-the-go (OTG) voltage threshold; computing, by a first comparator, a battery voltage error based on a difference between a battery voltage and the battery voltage threshold; computing, by a second comparator, an OTG voltage error based on a difference between an OTG voltage and the OTG voltage threshold; and selecting, by a loop selector, a battery voltage loop when the battery voltage error is smaller than the OTG voltage error.

A battery management system and method for extending battery lifetime is provided. In a test mode, the battery management system controls a charging frequency of a battery cell according to a plurality of pulse wave modulation signals respectively within a plurality of time intervals. The battery management system monitors impedances of the battery cell respectively within the plurality of time intervals or a plurality of capacitance ranges. The battery management system compares the impedances with each other to select one of the impedances, and sets a frequency of the pulse wave modulation signal that is outputted for controlling the charging frequency of the battery cell such that the battery cell has the selected impedance, as a practical frequency in a practical use mode. As a result, an increase in the impedance of the battery cell is delayed so as to extend lifetime of the battery cell.

A pulse charging system for a lithium-ion battery pack includes one or more controllers in electronic communication with the lithium-ion battery pack. The one or more controllers include one or more processors that execute instructions to estimate a plating intensity of the lithium-ion battery pack during two or more initial pulse charging cycles of the lithium-ion battery pack. The one or more controllers calculate an updated plating intensity of the lithium-ion battery pack corresponding to a subsequent pulse charging cycle that is determined based on the plating intensity of the lithium-ion battery pack. In response to determining the updated plating intensity falls within an acceptable range of plating intensity values, the one or more controllers execute an optimized pulse charging cycle that is based on the updated plating intensity.

An electric vehicle (EV) includes a battery pack, an electric motor, a drive circuit configured to drive the electric motor, a heat transfer material, arranged to transfer thermal energy from the electric motor to the battery pack, and a controller. The controller is configured to determine that the EV is connected to an external charger. In response, the controller generates the control signals comprising a waveform pattern that is free of zero volt vectors. The controller transmits the control signals to the drive circuit to drive the electric motor in accordance with the waveform pattern while the external charger charges the battery pack.