Battery's residual energy measurement circuit and sensor node
AssigneeFujitsu Limited
InventorKenichi Kawasaki
Life of this patent
Estimating the term…
Abstract
A battery's residual energy measurement circuit includes integrated amount measurement circuitry that measures quantity of an integrated amount of current flowing in a battery, time number measurement circuitry that measures number of times by which a sensing operation that changes the current flowing, time measurement circuitry that measures time, and residual energy calculation circuitry that calculates residual energy of the battery using the integrated amount measured within a measurement period by the integrated amount measurement circuitry, the number of times measured within the measurement period by the time number measurement circuitry and the measurement period measured by the time measurement circuitry.
Claims19
A battery's residual energy measurement circuit comprising:
- integrated amount measurement circuitry that measures quantity of an integrated amount of current flowing in a battery;
- time number measurement circuitry that measures number of times by which a sensing operation that changes the current flowing;
- time measurement circuitry that measures time;
- and
- residual energy calculation circuitry that calculates residual energy of the battery using the integrated amount measured within a measurement period by the integrated amount measurement circuitry, the number of times measured within the measurement period by the time number measurement circuitry and the measurement period measured by the time measurement circuitry.
A sensor node comprising:
- a battery;
- a sensor;
- sensor processing circuitry that performs a sensing operation of transmitting data detected by the sensor to outside of the sensor node using energy from the battery;
- integrated amount measurement circuitry that measures an integrated amount of current flowing to the battery;
- time number measurement circuitry that measures the number of times by which the sensing operation occurs;
- time measurement circuitry that measures time;
- and
- residual energy calculation circuitry that calculates residual energy of the battery using the integrated amount measured within a measurement period by the integrated amount measurement circuitry, the number of times measured within the measurement period by the time number measurement circuitry and the measurement period measured by the time measurement circuitry.
A battery's residual energy measurement circuit comprising:
- integrated amount measurement circuitry that measures an integrated amount of current flowing to a battery;
- counting circuitry that measures an occurrence time period within which an operation that changes the current occurs;
- time measurement circuitry that measures time;
- and
- residual energy calculation circuitry that calculates residual energy of the battery using the integrated amount measured within a measurement period by the integrated amount measurement circuitry, the occurrence time period measured within the measurement period by the counting circuitry and the measurement period measured by the time measurement circuitry.
Dependencies are inferred from the claim text.