Auxiliary Power Supply Current Switching for Sudden Power Loss
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Solution Overview
Problem
Volatile memory devices lose stored data when power is interrupted, and nonvolatile memory devices may suffer data damage during sudden power loss, necessitating an improved auxiliary power supply to maintain data integrity.
Innovation Solution
An auxiliary power supply system that includes a control circuit to adjust the peak current level based on charging state, using a first current source for initial charging and a second, higher current source when slow charging is detected, ensuring rapid and complete charging of the auxiliary power storage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a first current source with preset peak current level is used for charging the auxiliary power storage, then the charging process is stable and controlled, but the charging speed is slow when the voltage level is below reference voltage level
Solution Approach 1:
The patent implements dynamic current level adjustment by switching between a first current source with preset peak current level and a second current source with higher peak current level. The control circuit monitors the voltage level of the auxiliary power storage and dynamically selects the appropriate current source: using the first current source when voltage exceeds the reference level to maintain stability, and switching to the second current source when voltage falls below the reference level to accelerate charging. This dynamic adaptation resolves the contradiction between charging speed and charging stability.
Solution Approach 2:
The patent changes the electrical parameter (current level) based on the charging state. By detecting whether the voltage level is above or below the reference voltage level, the system adjusts the peak current level accordingly - using a lower preset peak current level for stable charging when voltage is sufficient, and switching to a higher peak current level to rapidly recharge when voltage drops. This parameter change strategy enables the system to optimize both charging speed and reliability under different operating conditions.
2Reliability
If power is abruptly stopped, then the storage device may experience sudden power loss, but data stored in volatile memory devices is lost and data in nonvolatile memory devices may be damaged
Solution Approach 1:
The patent employs preliminary action by maintaining the auxiliary power storage in a continuously charged state before any power failure occurs. The control circuit monitors the voltage level and proactively recharges the auxiliary power storage when it drops below the reference level, ensuring that sufficient power is always available. This preliminary recharging action guarantees that when abrupt power loss occurs, the auxiliary power supply can immediately activate to protect data integrity, resolving the contradiction between data protection and power supply duration.
Solution Approach 2:
The auxiliary power storage acts as a cushion against sudden power loss. By maintaining it charged through continuous monitoring and recharging when voltage drops below reference levels, the system creates a power buffer that can sustain operation during abrupt power interruptions. This beforehand cushioning ensures that even if main power fails suddenly, the auxiliary power supply provides sufficient duration to complete data protection operations, resolving the contradiction between data integrity and power supply duration.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system ensures stable operation of memory devices and controllers during sudden power loss by quickly and efficiently supplying auxiliary power, preventing data loss and damage.
Implementation Method 1
charge, for a reference time amount after the power is applied to the auxiliary power supply, the auxiliary power storage by a first current source having a preset peak current level
Implementation Method 2
increase, in response to the slow charging state, the peak current level to charge the auxiliary power storage by a second current source having the increased peak current level that is greater than the preset peak current level
Data Source
AI summary
An auxiliary power supply includes an auxiliary power storage configured to store power that is input to the auxiliary power supply and a control circuit, wherein the control circuit is configured to charge, for a reference time amount after the power is input to the auxiliary power supply, the auxiliary power storage by a first current source having a preset peak current level, determine, after the reference time amount, that the auxiliary power supply is in a slow charging state when a voltage level that is charged to the auxiliary power storage by the first current source for the reference time amount is lower than a reference voltage level, and increase, in response to the slow charging state, the peak current level to charge the auxiliary power storage by a second current source having the increased peak current level that is greater than the preset peak current level.