Start-Up Delay Circuit for Reliable Restart After Power Failure
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Solution Overview
Problem
Computer systems often fail to restart successfully after unexpected power failures due to residual voltages on the motherboard, leading to sporadic restart issues.
Innovation Solution
A start-up delay circuit is integrated into the boot-up sequence to detect and manage residual voltages, ensuring a controlled restart by delaying the boot-up process until these voltages are discharged.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a restart is attempted immediately after power failure, then the boot-up speed is improved, but the reliability of restart fails due to residual voltages on the motherboard
Solution Approach 1:
The patent applies preliminary action by introducing a delay circuit that preemptively waits for residual voltages to discharge before allowing the boot-up process to start. This preliminary delay ensures that the motherboard is fully discharged and safe to restart, preventing sporadic restart failures while maintaining acceptable boot-up speed through controlled timing.
2Reliability
If load resistors are used to discharge residual voltages, then the reliability of restart is improved, but the cost and complexity of the device increases
Solution Approach 1:
The patent applies self-service by utilizing the motherboard's own capacitive properties to discharge residual voltages automatically through its internal circuitry, rather than requiring external load resistors. The delay circuit simply monitors the voltage levels and provides timing control, allowing the system to self-discharge without adding complex external components or increasing device complexity.
Data Source
AI summary
Computer system and method for detecting failure of a mains supply voltage in the system, wherein a first control unit monitors the mains supply voltage, a second control unit monitors whether a system voltage fails, a start-up delay circuit is operated for renewed boot-up of the system after failure of the mains supply voltage to generate an enable signal for boot-up of the system, where the enable signal is set to a low level when the mains voltage signal has the low level, if the mains voltage signal has the high level again, and a delay timer is started with a delay time, and if the delay time has elapsed, then the enable signal for the boot-up is set again to the high level in order to detect whether a computer system has been shut down regularly and/or intentionally, or has crashed on account of an unexpected mains failure.