A wireless power transmitter can include a coil, an inverter coupled to the coil, and control circuitry coupled to the inverter that, responsive to receiving a burst request pulse from a wireless power receiver, initiates inverter operation, driving the coil and powering the receiver. The control circuitry can operate inverter switches so bandwidth of the wireless power transfer signal falls within a specified range by: (a) extending a minimum on time of the switches, (b) modifying pulse width modulation (PWM) drive signals supplied to the switches to shape a coil current burst envelope, and/or (c) modifying PWM signal amplitude supplied to the switches. Modifying the PWM drive signals can include using a symmetrical PWM scheme in which the positive and negative pulses are symmetrical in width on a cycle-by-cycle basis or using a complementary PWM scheme in which the positive and negative pulse widths are complementary on a cycle-by-cycle basis.

A reversible buck or boost converter is operable in a buck mode and in a boost mode. In the buck mode, the converter receives a supply voltage via an input terminal and generates a charging current that is supplied to a battery, thereby charging the battery. The supply voltage is also supplied through the converter to an output terminal. In a boost mode, the converter receives power form the battery and generates a supply current and voltage that is output onto the output terminal. The same single current sense resistor is used both to control the charging current in the buck mode and to control a constant current supplied to the output terminal in the boost mode. The output current is controlled to be constant, regardless of changes in the in the battery voltage and changes in the output voltage.

A charger includes a rectifier including two input terminals for connection to an AC power supply, a cathode terminal and an anode terminal, a DC/DC converter including a first terminal be connected to the cathode terminal, a second terminal to be connected to the anode terminal, and two output terminals for connection to a battery, a power pulsation absorbing circuit including a first diode, a second diode, a third diode, an inductor, a capacitor, a first switch and a second switch, and a control section configured to control a switch of the DC/DC converter, the first switch and the second switch, wherein the control section is configured to control the DC/DC converter, the first switch and the second switch in such a way that a sum of a power outputted from the AC power supply and a power outputted from the capacitor is constant.

A battery charging circuit can produce a pulsed charging current to charge a battery. During charging, without disconnecting the pulsed charging current from the battery, EIS measurements can be made. In other words, the pulsed charging current can serve double-duty, for battery charging and as a drive signal for the EIS measurements. The EIS measurements can be used to alter parameters of the pulsed charging current to improve battery life. In some instances, the parameters of the pulsed charging current can be momentarily changed for the purpose of making the EIS measurements, and then restored subsequent to making the measurements to parameters suitable for battery charging.

The disclosure concerns a portable beauty light kit, comprising a power management and control unit “PMC” and a plurality of light modules. The PMC comprises: a plurality of charging bays, and a signal transmitting circuit. Each of the individual light modules comprises: a light emitting source, a signal receiving circuit, and a housing. Each of the individual light modules is designed to nest within one of the charging bays of the PMC, wherein they receive a battery charge. Additionally, the light modules are designed to be taken from the charging bays of the PMC and removeably attached to a mirror. The signal receiving circuit of each light module is configured to receive a wireless signal communicated from the signal transmitting circuit of the PMC. The signal receiving circuit modulates a light emitting state associated with each light emitting source based on the signal communicated from the signal transmitting circuit.

The present inventions, in one aspect, are directed to techniques and/or circuitry to adjust, correct and/or compensate a state of charge of the battery using the data which is representative of the relaxation time (e.g., full relaxation time) of the battery. The techniques and/or circuitry may determine the data which is representative of a relaxation time based on or using: (i) the rate of decay of the voltage at the terminals of the battery after terminating application of the charge current to the battery, (ii) a voltage which is constant or substantially constant after termination of the charge current and/or (iii) an amount of time associated with the decay of the voltage at the terminals of the battery to at least a measured or predetermined voltage. Notably, the charge signal or current may include a plurality of pulses.

A method for charging rechargeable cells, in particular lithium ion cells. An apparatus for charging such cells. In order to specify a method for charging a lithium-based cell and an apparatus for charging a lithium-based cell, in which the capacitance of the cell is optimally used, the charging time is drastically shortened, the shelf life of the cell is extended and/or it is possible to increase the capacitance of the cell, a method is stated which includes the following steps, pulsed charging of the cell, wherein the charging current I.sub.L exceeds the nominal charging current I.sub.Lmax of the cell during the charging pulses; and the cell is discharged between the charging pulses using load pulses.

The present invention provides a fast charging method for battery, including the steps as follows: (1) the battery is charged with a constant current I.sub.1 and the charging time is t.sub.1; (2) the battery is charged with a constant current I.sub.2 and the charging time is t.sub.2; (3) the battery is discharged with the constant current I.sub.2 and the discharging time is t.sub.3, recycling until the voltage reaches a pre-charging voltage of battery; (4) the battery is standed after the voltage reaching the pre-charging voltage of battery, and the rest time is t.sub.4, and then the battery is charged with a constant current I.sub.3 until the voltage reaching a cut-off voltage of battery, and then the battery is charged with a constant voltage until the current reaching a cut-off current I.sub.4; wherein, I.sub.2<I.sub.1, t.sub.2<t.sub.1, t.sub.3<t.sub.1, I.sub.2<I.sub.3≦I.sub.1, I.sub.4≦I.sub.2. The fast charging method provided in present invention can decrease the polarization in pulse charging phase, increase the time of whole pulse charging phase, improve the charging speed in pulse charging phase, and thus shorten the full-charging time.

The present inventions, in one aspect, are directed to techniques and/or circuitry to applying a charge pulse to the terminals of the battery during a charging operation, measure a plurality of voltages of the battery which are in response to the first charge pulse, determine a charge pulse voltage (CPV) of the battery, wherein the charge pulse voltage is a peak voltage which is in response to the first charge pulse, determine whether the CPV of the battery is within a predetermined range or greater than a predetermined upper limit value and adapt one or more characteristics of a charge packet if the CPV is outside the predetermined range or is greater than a predetermined upper limit value.

When a hole in a separator is clogged, the cycle characteristics of a battery might be lowered and the internal resistance of a battery might be increased to reduce the output. Thus, a means for suppression of or recovery from degradation due to a clogged separator in a battery such as a lithium-ion secondary battery is provided. When reverse pulse current is supplied multiple times during charge, a separator is prevented from being clogged and a voltage increase (increase in internal resistance) during charge is suppressed, so that charge can be normally performed repeatedly.