Integrated Current Measurement for Battery Devices
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Solution Overview
Problem
Existing methods for measuring the integrated current amount in battery-driven devices, such as sensor devices with intermittent operation, face accuracy issues due to changing operation intervals and standby times, leading to inaccurate calculation of total integrated current when the measurement circuit is turned on and off intermittently.
Innovation Solution
An integrated-current-amount measurement apparatus that includes a measurement circuit to measure current during operation periods, a detection circuit to count load operations, and a calculation circuit to calculate the total integrated current amount based on the measured current and operation counts, even during periods when the measurement circuit is turned off, ensuring accurate calculation regardless of changing operation intervals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the measurement circuit is turned on and off intermittently to reduce power consumption, then power consumption is reduced, but measurement accuracy deteriorates when operation intervals change
Solution Approach 1:
The detection circuit continuously monitors load operation states even when the measurement circuit is turned off, capturing operation timing information in advance. This preliminary detection enables accurate calculation of integrated current amounts during standby periods without requiring the measurement circuit to remain continuously active, thus resolving the contradiction between power consumption reduction and measurement accuracy maintenance
Solution Approach 2:
A detection circuit serves as an intermediary between the load and the measurement circuit. When the measurement circuit is turned off, the detection circuit continues to monitor load operations and store this information. When the measurement circuit is turned on, it uses this pre-captured data to calculate integrated current amounts accurately, enabling the measurement circuit to operate intermittently while maintaining measurement precision
2Measurement precision
If the measurement circuit operates continuously to maintain measurement accuracy, then measurement accuracy is maintained, but power consumption increases
Solution Approach 1:
The measurement system is segmented into two functional parts: a detection circuit that continuously monitors load operations with minimal power consumption, and a measurement circuit that periodically calculates integrated current amounts. This segmentation allows the majority of the time (standby periods) to be covered by the low-power detection circuit, while the higher-power measurement circuit operates only when needed for calculations, thus maintaining accuracy while reducing overall power consumption
Solution Approach 2:
The measurement circuit operates periodically rather than continuously, turning on at scheduled intervals to perform integrated current amount calculations and then turning off during standby periods. This periodic operation is made effective by the detection circuit's continuous monitoring of load operations, which provides the necessary data for accurate calculations during the measurement circuit's active periods, achieving both power savings and measurement accuracy
3Use of energy by moving object
If the measurement circuit stops during standby periods to save power, then power consumption is reduced, but calculation accuracy of total integrated current deteriorates
Solution Approach 1:
The detection circuit performs preliminary detection of load operation states during standby periods when the measurement circuit is off. It records the timing and duration of load operations continuously, storing this information for later use. When the measurement circuit turns on, it uses this pre-recorded data to calculate the integrated current amount for the standby period accurately, eliminating the need for the measurement circuit to remain active while maintaining calculation precision
Solution Approach 2:
The detection circuit acts as an intermediary that bridges the gap between the measurement circuit's intermittent operation and the need for continuous monitoring accuracy. It continuously tracks load operations during standby periods and transfers this information to the measurement circuit when active, enabling the measurement circuit to calculate total integrated current amounts accurately without needing to operate continuously, thus resolving the contradiction between power savings and calculation accuracy
Data Source
AI summary
A measurement circuit measures a first integrated amount (integrated current amount) of a current which flows from a battery to a load. The first integrated amount is an amount in a first time period in which the measurement circuit operates. A detection circuit detects the number of operations of the load. A calculation circuit calculates a second integrated amount (total integrated-current amount) of the current on the basis of the number of operations and the first integrated amount. The second integrated amount is an amount in a third time period including a second time period in which the measurement circuit stops.