This disclosure describes techniques for operating a corded electronic device in which a battery and a power control unit manage power draw from an external power source electrically coupled to the corded electronic device using a physical cord, such as a universal serial bus (USB) cable. The power control unit automatically supplements an electrical current continuously drawn by the corded electronic device from the external power source with an electrical current from the battery, when needed. Moreover, the power control unit operates to limit the current drawn from the external power source and the physical cord so as to ensure the current does not exceed any limitations or requirements associated with the external power source or the physical cord.

Current-limiting battery usage within a corded electronic device

An object of the invention is to provide a battery control apparatus capable of accurately obtaining permissible charging or discharging power in keeping with variation of the internal resistance of a battery. The battery control apparatus of this invention includes an internal resistance table in which the internal resistance value of single cells corresponding to the temperature and state of charge thereof are described in association with each of charging or discharging duration time of the single cells. The battery control apparatus calculates a permissible charging current or a permissible discharging current by using the internal resistance value described in the internal resistance table and controls the charging or discharging of the single cells in accordance with the current value thus obtained.

Battery control device and battery system

An object of the present invention is to improve the cooling performance of a capacitor module used in a power conversion apparatus. The power conversion apparatus according to the present invention includes a power semiconductor module, a capacitor module, a flow path forming body that forms a flow path through which a cooling refrigerant flows . The flow path forming body includes a first flow path forming body that forms a first flow path part for cooling the power semiconductor module, and a second flow path forming body that forms a second flow path part for cooling the capacitor module. The first flow path forming body is provided on a side portion of the second follow path forming body and is integrally formed with the second flow path forming body. The second flow path forming body forms a housing space for housing the capacitor module above the second flow path part . The first flow path part is formed at a position facing the side wall that forms the housing space. The power semiconductor module is inserted into the first flow path part.

Power Conversion Apparatus

A charger (26, 40) for an electronic device (11) that charges a rechargeable battery (41) of the electronic device. The charger includes a detection unit (57, 26), which detects connection of another electronic device (22) to the electronic device through a communication cable (21) including a power supply line. A charging unit (53) charges the rechargeable battery with power supply voltage (Vbus) from the power supply line. A measurement unit (57, 58, 60) acquires a measurement value (Vm) indicating a degree of a voltage drop of the power supply voltage occurred when the charging unit performs charging. A control unit (26) instructs a charging current value (I;Ib) for charging the rechargeable battery with the charging unit. When the detection unit (57, 26) detects connection of the other electronic device, the control unit (26) monitors the measurement value while instructing the charging unit to increase the charging current value from an initial current value (Io) and determines the charging current value based on the monitored measurement value.

Charger for electronic device, electronic device, and charging method

A charging circuit may include a battery unit in which a rechargeable battery is mounted; a charging unit configured to provide a charging current to the rechargeable battery in the battery unit, based on a direct current (DC) voltage converted from an alternating current (AC) voltage, and configured to charge the rechargeable battery; and/or a controller configured to control the charging unit such that the charging unit provides the rechargeable battery with a first charging current following a first current profile in a first charging mode as the charging current at least in a first period of the first charging mode, based on the charging current, a battery voltage of the rechargeable battery, and a temperature of the rechargeable battery, wherein the first current profile is smaller than an available maximum current in the first period.

Charging circuits, charging systems, and wireless power reception devices including the same

Embodiments of the present invention include techniques for charging a battery using a regulator In one embodiment, the present invention includes an electronic circuit comprising a regulator having an input coupled to a power source for receiving a voltage and a current and an output for providing an output current, an input voltage detection circuit coupled to the power source, and an adjustable current limit circuit for controlling the input or output current of the regulator, wherein input voltage detection circuit monitors the voltage from the power source and the adjustable current limit circuit changes the input or output current of the regulator to optimize the power drawn from power source

Takashi Kanamori

Papers

Battery charging systems and methods with adjustable current limit