Over-discharge Detection Circuit Power Management
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Solution Overview
Problem
Existing mobile information processing devices with secondary batteries face issues of increased power consumption during over-discharge detection due to continuous operation of detection circuits, leading to worsened battery state and inefficient charging from unstable power sources like solar cells.
Innovation Solution
A mobile information processing device with an over-discharge detection circuit that stops detection operations when the battery is over-discharged, and a power down cancel circuit that re-starts detection when a predetermined current is supplied from a power feeding circuit, reducing power consumption to zero during power down mode and allowing cancellation based on power supply capability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the over-discharge detection circuit continues to operate while supplied with electric power from the secondary battery after detecting an over-discharged state, then the detection function is maintained, but the power consumption increases and the over-discharged state worsens
Solution Approach 1:
The detection circuit operates periodically rather than continuously. A power down cancel circuit monitors for sufficient power supply conditions and periodically re-activates the detection function when appropriate, rather than maintaining continuous operation. This reduces power consumption while preserving essential detection capability.
Solution Approach 2:
The power down cancel circuit automatically monitors power supply conditions and re-activates the detection circuit when sufficient power is available, without requiring external intervention. The system self-manages the transition between power-saving and active detection states based on power availability.
2Reliability
If the power down mode is cancelled immediately after charging starts with an unstable power generator, then the detection function is restored, but insufficient current is supplied and the battery power is consumed
Solution Approach 1:
The power down cancel circuit continuously monitors the power supply condition through a detection terminal and uses this feedback to determine when to re-activate the detection circuit. Only when sufficient power supply is confirmed does the circuit cancel power down mode, preventing premature activation that would consume battery power.
Solution Approach 2:
The power down cancel circuit performs preliminary monitoring of power supply conditions before re-activating the detection function. This preliminary check ensures that sufficient power is available before restoring the detection operation, preventing battery power consumption during insufficient power conditions.
Data Source
AI summary
An integrated circuit includes: an over-discharge detection circuit that is supplied with electric power from a secondary battery, and is configured to detect whether or not the secondary battery is in an over-discharged state, and upon detecting that the secondary battery is in an over-discharged state over a predetermined period, stop a detection operation according to an enable signal; and a power down cancel circuit configured to, when the over-discharge detection circuit has stopped the detection operation, cause the over-discharge detection circuit to re-start the detection operation when a current supplied to a detection terminal from a power feeding circuit is a predetermined current or more.