Power circuit, power supply method, and electronic device
AssigneeSony Corporation
InventorsKoji Aoyagi, Kuniharu Onozuka
Life of this patent
Estimating the term…
Abstract
A power circuit is provided so that a charge can be normally driven even during replacement of a first battery. This power circuit comprises: first and second batteries for driving a charge; a first battery voltage detection means; a first switch for controlling a second battery power supply path based on an output of the voltage detection means; an overcharge prevention means for preventing an overcharge for the secondary battery caused by the first battery; and a switch controlled by an output of the overcharge prevention means.
Claims22
A power circuit comprising:
- a first battery for driving a charge;
- a second battery for driving the charge in place of the first battery;
- a voltage detection means for detecting a terminal voltage of the first battery;
- a first switch for controlling a power supply path of the second battery based on an output of the voltage detection means;
- an overcharge prevention means for preventing an overcharge for the second battery caused by the first battery;
- and
- a second switch connected to a charge path for the second battery and controlled by the output of the overcharge prevention means, said power circuit characterized in that, when the first battery is lowered to a predetermined voltage or less, the charge is driven by means of the second battery.
A power supply method comprising:
- a voltage detection step of detecting a terminal voltage of a first battery for driving a charge;
- a step of controlling a first switch connected to a power supply path of a second battery for driving the charge in place of the first battery based on the result of the voltage detection step;
- an overcharge prevention step of preventing an overcharge for the second battery caused by the first battery;
- and
- a step of controlling a second switch for preventing an overcharge connected to a charge path for the second battery based on the result of the overcharge preventing step, said power supply method characterized in that, when the first battery is lowered to a predetermined voltage or less, the charge is driven by the second battery.
An electronic device comprising:
- a first battery for driving a charge;
- a second battery for driving the charge in place of the first battery;
- a voltage detection means for detecting a terminal voltage of the first battery;
- a first switch for controlling a power supply path of the second battery based on an output of the voltage detection means;
- an overcharge prevention means for preventing an overcharge for the second battery caused by the first battery;
- and
- a second switch connected to a charge path for the second battery and controlled by the output of the overcharge prevention means, said power circuit characterized in that, when the first battery is lowered to a predetermined voltage or less, the charge is driven by means of the second battery.
Dependencies are inferred from the claim text.