Device and method for controlling secondary battery
First Claim
1. An electronic device having a shutdown mode, the electronic device being driven by power supplied from a secondary battery, comprising:
- a control device configured to be changeable between a normal mode while the electronic device is in the shutdown mode, and a sleep mode while the electronic device is in the shutdown mode, the normal and sleep modes both being control-device modes, with the sleep mode being a mode in which a discharging current value from the secondary battery is smaller than that of the normal mode; and
a CPU section of the control device, the CPU section being stopped during the sleep mode and restored when the control device changes from the sleep mode to the normal mode;
wherein the control section comprises;
an acquisition section configured to acquire a remaining capacity of the secondary battery during the normal mode immediately before the sleep mode;
a calculation section configured to calculate, as a restoration time from the sleep mode, a time which is shorter than a full discharge time that is required for the secondary battery to be fully discharged, by using the remaining capacity of the secondary battery acquired during the normal mode immediately before the sleep mode, and using a discharging current value from the secondary battery during the normal mode;
a setting section configured to calculate the restoration time in a wake timer which functions even during the sleep mode; and
an instruction section which causes the wake timer to start when changing from the normal mode to the sleep mode, performs a restoration from the sleep mode to the normal mode when the restoration time set in the wake timer is up, and instructs the acquisition section to reacquire the remaining capacity of the secondary battery.
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Accused Products
Abstract
A secondary battery control device having a sleep mode includes a current detection element for detecting a charging/discharging current value of a battery, a voltage detection element for detecting an open-circuit voltage value of the battery, and a control section for calculating the remaining capacity of the battery based on the detected values. When the control section enters the sleep mode, the control section sets, in a wake timer, based on the remaining battery capacity and the discharging current value at this time, an amount of time required for the remaining battery capacity to reach a predetermined value (about 5%), as an amount of time required for the control section to be restored to a normal mode. When the set amount of time has passed, the control section is restored to the normal mode, and corrects the remaining battery capacity to obtain an accurate remaining battery capacity.
23 Citations
12 Claims
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1. An electronic device having a shutdown mode, the electronic device being driven by power supplied from a secondary battery, comprising:
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a control device configured to be changeable between a normal mode while the electronic device is in the shutdown mode, and a sleep mode while the electronic device is in the shutdown mode, the normal and sleep modes both being control-device modes, with the sleep mode being a mode in which a discharging current value from the secondary battery is smaller than that of the normal mode; and a CPU section of the control device, the CPU section being stopped during the sleep mode and restored when the control device changes from the sleep mode to the normal mode;
wherein the control section comprises;an acquisition section configured to acquire a remaining capacity of the secondary battery during the normal mode immediately before the sleep mode; a calculation section configured to calculate, as a restoration time from the sleep mode, a time which is shorter than a full discharge time that is required for the secondary battery to be fully discharged, by using the remaining capacity of the secondary battery acquired during the normal mode immediately before the sleep mode, and using a discharging current value from the secondary battery during the normal mode; a setting section configured to calculate the restoration time in a wake timer which functions even during the sleep mode; and an instruction section which causes the wake timer to start when changing from the normal mode to the sleep mode, performs a restoration from the sleep mode to the normal mode when the restoration time set in the wake timer is up, and instructs the acquisition section to reacquire the remaining capacity of the secondary battery. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A control method for a control device used for an electronic device having a shutdown mode, the electronic device being driven by power supplied from a secondary battery, wherein the control device is changeable between a normal mode while the electronic device is in the shutdown mode, and a sleep mode while the electronic device is in the shutdown mode, the normal and sleep modes both being control-device modes, with the sleep mode being a mode in which a discharging current value from the secondary battery is smaller than that of the normal mode, and a CPU section of the control device is stopped during the sleep mode and the CPU section is restored when the control device changes from the sleep mode to the normal mode;
- wherein the control method comprises the steps of;
acquiring a remaining capacity of the secondary battery during the normal mode immediately before the sleep mode; calculating, as a restoration time from the sleep mode, a time which is shorter than a full discharge time that is required for the secondary battery to be fully discharged, by using the remaining capacity of the secondary battery acquired during the normal mode immediately before the sleep mode, and using a discharging current value from the secondary battery during the normal mode; setting the restoration time in a wake timer which functions even during the sleep mode; and causing the wake timer to start when changing from the normal mode to the sleep mode, performing a restoration from the sleep mode to the normal mode when the restoration time set in the wake timer is up, and reacquiring the remaining capacity of the secondary battery. - View Dependent Claims (11, 12)
- wherein the control method comprises the steps of;
Specification