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US 10,948,545 B2Granted
Residual quantity measuring device, battery pack, electric power tool, electric aircraft, electric vehicle, and power supply device
AssigneeMurata Manufacturing Co., Ltd.
InventorYasushi Mori
Life of this patent
Estimating the term…
Abstract
A residual quantity measuring device is provided. The residual quantity measuring device includes a Hall element that is inserted into a path of a current flowing in a battery unit and outputs an output voltage associated with the current; and a Coulomb counter configured to be supplied with the output voltage of the Hall element via a voltage conversion circuit and to detect a total quantity of a current flowing into the battery unit and a current flowing out of the battery unit.
Claims12
A residual quantity measuring device, comprising:
- a Hall element that is inserted into a path of a current flowing in a battery unit and outputs an output voltage associated with the current;
- and
- a Coulomb counter configured to be supplied with the output voltage of the Hall element via a voltage conversion circuit and to detect a total quantity of a current flowing into the battery unit and a current flowing out of the battery unit;
- wherein the voltage conversion circuit includes:
- an input terminal configured to be supplied with the output voltage of the Hall element,
- a first voltage divider that is provided between the input terminal and a ground;
- a second voltage divider that is provided in parallel with the first voltage divider and has a ratio of voltage division different from the first voltage divider;
- and
- wherein the Coulomb counter is configured to be supplied with an output voltage from the first divider or the second divider.
6 more elements
A battery pack, comprising:
- a battery unit that includes a secondary battery;
- a Hall element that is inserted into a path of a current flowing in a battery unit and outputs an output voltage associated with the current;
- and
- a Coulomb counter configured to be supplied with the output voltage of the Hall element via a voltage conversion circuit and to detect a total quantity of a current flowing into the battery unit and a current flowing out of the battery unit;
- wherein the voltage conversion circuit includes:
- an input terminal configured to be supplied with the output voltage of the Hall element,
- a first voltage divider that is provided between the input terminal and a ground;
- a second voltage divider that is provided in parallel with the first voltage divider and has a ratio of voltage division different from the first voltage divider;
- and
- wherein the Coulomb counter is configured to be supplied with an output voltage from the first divider or the second divider.
7 more elements
Dependencies are inferred from the claim text.