Voltage Supply Controller for Nonvolatile Memory
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Solution Overview
Problem
Nonvolatile memory devices that use external high voltage generators continue to supply high voltage to internal circuitry even when the power supply voltage is interrupted, leading to degradation and increased leakage current, which can damage components and reduce operational performance.
Innovation Solution
A voltage supply controller that detects the level of the power supply voltage and generates a first internal voltage based on both the power supply voltage and an external high voltage, adjusting its level to prevent damage and reduce current consumption by interrupting or reducing the external high voltage when the power supply is abnormal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If external high voltage is continuously supplied to internal circuitry during power interruption, then high voltage generation capability is maintained, but component degradation increases and leakage current rises
Solution Approach 1:
The voltage supply controller detects power supply voltage abnormalities in advance and proactively interrupts or reduces the external high voltage supply before damage occurs. The controller monitors the power supply voltage level and, upon detecting an abnormal condition (such as power interruption or undervoltage), it preemptively adjusts the high voltage output to prevent component degradation and excessive leakage current that would otherwise occur during power failures.
2Object-affected harmful factors
If external high voltage is interrupted during power abnormality, then component damage is prevented and leakage current is reduced, but high voltage operations cannot be completed
Solution Approach 1:
The voltage supply controller dynamically adjusts the external high voltage supply based on the detected power supply voltage conditions. Rather than using a fixed on/off control, the controller continuously adapts the high voltage output level to match the current power supply status, enabling flexible response that can either interrupt or reduce voltage depending on the severity and type of power abnormality detected.
Solution Approach 2:
The controller changes the voltage supply parameters (voltage level and supply state) based on detected power supply conditions. When normal power is detected, full external high voltage is supplied; when power abnormalities are detected, the controller modifies these parameters by either reducing the voltage level or completely interrupting the supply, thereby optimizing both component protection and operational capability under different power conditions.
3Reliability
If voltage supply controller continuously monitors power supply voltage, then power abnormalities are detected in time, but power consumption increases
Solution Approach 1:
The voltage supply controller implements a feedback mechanism where the detected power supply voltage information is fed back to the controller, which then automatically adjusts the external high voltage supply accordingly. This closed-loop control ensures that the high voltage output is continuously optimized based on real-time power supply conditions, achieving both accurate detection response and energy efficiency by only adjusting voltage when actually needed.
Data Source
AI summary
A nonvolatile memory device includes a voltage supply controller (VSC) detecting a level of a power supply voltage and generating a first internal voltage in response thereto. The VSC provides the first internal voltage at a level equal to an external high voltage when a power supply voltage is normally supplied, but provides the first internal voltage at a level lower than the external high voltage when a power supply voltage is abnormally supplied.