Renesas Electronics Corporation

Hidekazu Nagato

Hiromasa Takahashi

Masaki Komatsu

Kenta Kobayashi

Toshitaka Ukai

A semiconductor device includes a voltage measurement unit that measures an output voltage of a battery, a current measurement unit that measures a discharge current of the battery; and a controller that determines, in a first measurement mode, whether to employ a first discharge current as a power calculation current based on a difference between the first and a second discharge current, the second discharge current being the discharge current measured by the current measurement unit before the first discharge current is measured, in which the controller estimates an internal resistance of the battery based on the power calculation current and the output voltage measured in the first measurement mode and the discharge current and the output voltage measured in a second measurement mode, and calculates, based on the internal resistance that is estimated, a maximum power amount that can be output by the battery in the second measurement mode.

Semiconductor device, battery pack, and mobile terminal with multi-speed CPU

A battery control IC includes a voltage measurement unit that measures, in a normal current mode, a voltage value of each of a plurality of unit battery cells forming a battery pack, and measures, in a short-time large-current mode, a voltage value of a unit battery cell that has exhibited a lowest voltage value in the normal current mode, and a calculation unit that calculates an available power value of the battery pack in the short-time large-current mode based on a voltage value, measured in the short-time large-current mode, of the unit battery cell that has exhibited the lowest voltage value in the normal current mode.

Battery control IC and control method therefore

A semiconductor device includes: a voltage measurement unit that measures an output voltage of a battery; a current measurement unit that measures a discharge current of the battery; and a controller that determines, in a first measurement mode, whether to employ a first discharge current as a power calculation current based on a difference between the first and a second discharge current, the second discharge current being the discharge current measured by the current measurement unit before the first discharge current is measured, in which: the controller estimates an internal resistance of the battery based on the power calculation current and the output voltage measured in the first measurement mode and the discharge current and the output voltage measured in a second measurement mode, and calculates, based on the internal resistance that is estimated, a maximum power amount that can be output by the battery in the second measurement mode.

Semiconductor device, battery pack, and mobile terminal

A semiconductor device includes a voltage measurement unit that measures an output voltage of a battery and a voltage on a power supply path between the battery and an internal circuit supplied with electric power from the battery, a current measurement unit that measures a discharge current of the battery, and a control unit that calculates a theoretical value of the output voltage in a normal measurement mode assuming that the discharge current measured in a large current measurement mode is a maximum available current of the battery in the large current measurement mode, and calculates an amount of maximum available power of the battery in the large current measurement mode based on the calculated theoretical value of the output voltage and the voltage on the power supply path measured in the large current measurement mode.

Semiconductor device, battery pack, and mobile terminal including voltage measurement, current measurement, and control

A semiconductor device includes a voltage measurement unit that measures a voltage of a battery, a current measurement unit that measures charging and discharging currents of the battery, a data processing control unit, and a current detection unit. The voltage measurement unit and the current measurement unit are able to measure the voltage and the discharging current of the battery in case that the current detection unit detects that the discharging current exceeds a predetermined threshold. The data processing control unit estimates an internal resistance of the battery based on a voltage measurement value measured by the voltage measurement unit in accordance with the detection performed by the current detection unit and a current measurement value measured by the current measurement unit in accordance with the detection performed by the current detection unit, and calculates an amount of maximum power capable of being supplied from the battery.

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Kawasaki, Japan

Hidekazu Nagato