Abstract: A method for charging batteries constructed from Lithium cells, the method including a substantially monotonically increasing time-varying voltage phase interposed between conventional constant current (CC) and constant voltage (CV) phases. Advantageously, methods according to the present disclosure provide rapid charging of Lithium batteries without negatively affecting their service lifetime(s). More specifically—and in sharp contrast to prior art methods—methods according to the present disclosure: (a) provide charging of Lithium batteries such that peak cell voltages are reduced; (b) do not appreciably increase charging time; (c) may be readily and inexpensively implemented in a charger; and (d) do not require communication with a Battery Management System or measurement of individual cell voltages.

Abstract: A low-loss current sensor for use with a circuit containing a capacitor to sense a current flowing into a node in the circuit is provided. The current sensor includes a differentiator circuit having an input connected to the circuit capacitor and adapted to generate an output which is proportional to the current flowing through the circuit capacitor. The novel use of a capacitive current divider allows the sensor to sense current with virtually no power dissipation.

Abstract: A low-loss current sensor for use with a circuit containing a capacitor to sense a current flowing into a node in the circuit is provided. The current sensor includes a differentiator circuit having an input connected to the circuit capacitor and adapted to generate an output which is proportional to the current flowing through the circuit capacitor. The novel use of a capacitive current divider allows the sensor to sense current with virtually no power dissipation.