Power source circuit for cell and cell pack
First Claim
1. A power source circuit for a cell for controlling transfer of electric energy from said cell to loads, wherein a device employing said power source circuit is operated in a manner that, when a discharge voltage of said cell becomes lower than an operation lower limit voltage of said device to be operated, a voltage output from said power source circuit for said cell is made higher than said operation lower limit voltage of said device by using a voltage increasing unit.
1 Assignment
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Accused Products
Abstract
A power source circuit for a cell and a cell pack are provided which are capable of operating them, when warnings of operation termination are displayed during use of a portable terminal device, as an emergency operation, in such a case where operation time of the portable terminal device is shortened extremely due to degradation in a discharge characteristic of the cell or due to a voltage drop occurring when the cell is used in a low temperature state. The portable terminal device is operated in a manner that a voltage output from the cell power source circuit is made higher than its operation lower limit voltage when a discharge voltage of the cell becomes lower than its operation lower limit voltage and, as a factor for detecting termination of discharge, the discharge termination is detected according to an amount of voltage drop in the cell per unit time.
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Citations
14 Claims
- 1. A power source circuit for a cell for controlling transfer of electric energy from said cell to loads, wherein a device employing said power source circuit is operated in a manner that, when a discharge voltage of said cell becomes lower than an operation lower limit voltage of said device to be operated, a voltage output from said power source circuit for said cell is made higher than said operation lower limit voltage of said device by using a voltage increasing unit.
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3. A power source circuit for a cell for controlling transfer of electric energy from said cell to loads, said power source circuit comprising a cell voltage detecting circuit to detect a voltage of said cell, a discharge controlling circuit, an output voltage detecting circuit, a step-up DC-DC converter, a switching circuit to switch a positive electrode of said cell to either of an output terminal of said power source circuit or an inputting section of said step-up DC-DC converter, and a power storing section mounted in an outputting section of said power source circuit,
wherein said device employing said power source cell is operated in a manner that, when a discharge voltage of said cell becomes lower than an operation lower limit voltage of said device to be operated, a voltage output from said power source circuit for said cell is made higher than said operation lower limit voltage of said device by using said step-up DC-DC converter.
- 6. A power source circuit for a cell for controlling transfer of electric energy from said cell to loads, said power source circuit comprising a cell voltage detecting circuit to detect a voltage of said cell, a control circuit, an output voltage detecting circuit, a step-up DC-DC converter, an inductor, two or more switching circuits, a power storing section mounted in said outputting section, wherein said device employing said power source cell is operated in a manner that, when a discharge voltage of said cell becomes lower than an operation lower limit voltage of said device to be operated, a voltage output from said power source circuit for said cell is made higher than said operation lower limit voltage of said device by using said step-up DC-DC converter.
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9. A cell pack comprising a cell, a power source circuit for said cell for controlling transfer of electric energy from said cell to loads, and a case for housing the power source circuit and the cell therein,
wherein a device employing said power source circuit is operated in a manner that, when a discharge voltage of said cell becomes lower than an operation lower limit voltage of said device to be operated, a voltage output from said power source circuit for said cell is made higher than said operation lower limit voltage of said device by using a voltage increasing unit.
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11. A cell pack comprising a cell, a power source circuit for said cell for controlling transfer of electric energy from said cell to loads, and a case for housing the power source circuit and the cell therein,
wherein said power source circuit comprises a cell voltage detecting circuit to detect a voltage of said cell, a discharge controlling circuit, an output voltage detecting circuit, a step-up DC-DC converter, a switching circuit to switch a positive electrode of said cell to either of an output terminal of said power source circuit or an inputting section of said step-up DC-DC converter, and a power storing section mounted in an outputting section of said power source circuit, wherein said device employing said power source cell is operated in a manner that, when a discharge voltage of said cell becomes lower than an operation lower limit voltage of said device to be operated, a voltage output from said power source circuit for said cell is made higher than said operation lower limit voltage of said device by using said step-up DC-DC converter.
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13. A cell pack comprising a cell, a power source circuit for said cell for controlling transfer of electric energy from said cell to loads, and a case for housing the power source circuit and the cell therein,
wherein said power source circuit comprises a cell voltage detecting circuit to detect a voltage of said cell, a control circuit, an output voltage detecting circuit, a step-up DC-DC converter, an inductor, two or more switching circuits, a power storing section mounted in said outputting section, wherein said device employing said power source cell is operated in a manner that, when a discharge voltage of said cell becomes lower than an operation lower limit voltage of said device to be operated, a voltage output from said power source circuit for said cell is made higher than said operation lower limit voltage of said device by using said step-up DC-DC converter.
Specification