Power-On-Reset Trigger Circuit for Dead-Battery Activation Control
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Solution Overview
Problem
Consumer electronic products often face issues where circuit blocks are activated before the battery voltage reaches a sufficient level, leading to excessive current draw and preventing proper charging of lithium-ion batteries, especially when using eFuses and eFuse sense circuits.
Innovation Solution
A power-on-reset (POR) device with a trigger circuit that generates a signal only when the battery voltage exceeds the dead battery condition voltage level, ensuring the circuit block is activated after the battery is adequately charged, utilizing a POR circuit to switch from a deactivation to an activation state upon receiving this signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the circuit block is activated before the battery voltage reaches the dead battery condition voltage level, then the circuit block can be powered on, but the battery cannot be charged above the dead battery condition voltage level due to excessive current draw
Solution Approach 1:
The POR device performs preliminary action by monitoring battery voltage and preventing circuit block activation until the battery voltage reaches the required threshold level. This ensures the battery is adequately charged before the circuit block draws significant current, resolving the contradiction between early activation and reliable charging.
2Productivity
If the POR device uses high current to quickly charge the battery above the dead battery condition voltage level, then the battery can be charged faster, but the circuit block may still draw excessive current and prevent proper charging
Solution Approach 1:
The POR device implements feedback control by continuously monitoring battery voltage and using this information to control the activation timing of the circuit block. The device only enables circuit block operation when voltage feedback indicates the battery has reached the safe threshold, ensuring both charging reliability and appropriate activation timing.
3Loss of time
If the POR device activates the circuit block immediately upon power connection, then the device can be used right away, but the battery voltage may be too low and cause current hogging
Solution Approach 1:
The POR device performs preliminary voltage monitoring and threshold verification before allowing circuit block activation. This preliminary action ensures that the battery voltage is sufficient to support circuit block operation without causing current management issues, accepting a brief delay for the sake of system reliability.
Data Source
AI summary
The present disclosure relates generally to power-on-reset (POR) devices for activation of a circuit block powered by a battery. The POR devices activate a circuit block when a battery voltage level of a battery voltage generated by the battery is above a dead battery condition voltage level. So that the circuit block is activated after the battery voltage level of the battery voltage has reached the dead battery condition voltage level, the POR device includes a trigger circuit. The trigger circuit is operable to receive the battery voltage and is configured to generate a trigger signal in response to the battery voltage level being charged above a trigger voltage level, which is equal to or greater than the dead battery condition voltage level. The POR circuit is also operable to generate a POR signal in an activation state and activate the circuit block.