Power Control Circuit for Delayed Reset During Power Fluctuations
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Solution Overview
Problem
Electronic systems face instability and crashes due to unstable external AC power sources, leading to incomplete data storage and reset operations when power is reintroduced prematurely.
Innovation Solution
A power control device comprising a power supply unit, a reset unit, and a power control unit that determines the availability of an external voltage, generates appropriate signals for reset and power enabling, and delays the reset operation to ensure complete data storage before power is re-provided, preventing system crashes during power fluctuations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the power management unit stops providing operation voltage immediately when external power is lost, then the system can quickly respond to power failure, but the processing unit cannot complete data storage or reset operations, causing system crash
Solution Approach 1:
The power management unit delays stopping the operation voltage to allow the processing unit to complete data storage in non-volatile memory or reset operations before power is actually cut off. This preliminary extension of power supply ensures critical operations finish successfully, preventing system crash while still responding to power failure conditions.
2Reliability
If the power management unit delays stopping operation voltage to allow data storage, then the system can complete data storage operations, but the system cannot quickly recover when external power is restored during the delay period
Solution Approach 1:
The power management unit continuously monitors the state of the processing unit during the delayed power cutoff period. When external power is restored, the power management unit detects whether the processing unit has completed its operations and only then re-provides operation voltage, ensuring the system is in a known good state before resuming operation.
3Productivity
If the system immediately re-provides operation voltage when external power is restored, then the system can quickly recover, but the processing unit may be in an unknown state causing system crash
Solution Approach 1:
When external power is restored, the power management unit does not immediately re-provide operation voltage. Instead, it first waits for a predetermined period to allow the processing unit to complete any ongoing operations and enter a known state, then verifies the system state before resuming power supply, ensuring safe recovery.
Data Source
AI summary
A power control device is provided. The power control device includes a power supply unit, a reset unit, and a power control unit. The power supply unit determines whether a supplied voltage from an external voltage supply source is being provided to the power supply unit to generate a determination signal. The power supply unit further generates an operation voltage and a standby voltage according to the supplied voltage. The reset unit receives the determination signal and the standby voltage and generates a reset signal according to the determination signal and the standby voltage to activate a reset operation. The power control unit receives the reset signal and generates a power enabling signal according to the reset signal. The power supply unit outputs the operation voltage or does not according to the power enabling signal.